From bb6067e9800317614bf09eacf2eabe33c89ea7a5 Mon Sep 17 00:00:00 2001 From: Sachin Kamat Date: Fri, 3 May 2013 15:13:36 +0530 Subject: hwmon: (abituguru3) Remove redundant platform_set_drvdata() Commit 0998d06310 (device-core: Ensure drvdata = NULL when no driver is bound) removes the need to set driver data field to NULL. Signed-off-by: Sachin Kamat Cc: Hans de Goede Signed-off-by: Guenter Roeck --- drivers/hwmon/abituguru3.c | 1 - 1 file changed, 1 deletion(-) (limited to 'drivers/hwmon') diff --git a/drivers/hwmon/abituguru3.c b/drivers/hwmon/abituguru3.c index 1d2da31c27c..0cac8c0b001 100644 --- a/drivers/hwmon/abituguru3.c +++ b/drivers/hwmon/abituguru3.c @@ -1079,7 +1079,6 @@ static int abituguru3_remove(struct platform_device *pdev) int i; struct abituguru3_data *data = platform_get_drvdata(pdev); - platform_set_drvdata(pdev, NULL); hwmon_device_unregister(data->hwmon_dev); for (i = 0; data->sysfs_attr[i].dev_attr.attr.name; i++) device_remove_file(&pdev->dev, &data->sysfs_attr[i].dev_attr); -- cgit v1.2.3-70-g09d2 From 807f730105e986b3b2da711cfd94f22b92532f79 Mon Sep 17 00:00:00 2001 From: Sachin Kamat Date: Fri, 3 May 2013 15:13:37 +0530 Subject: hwmon: (coretemp) Remove redundant platform_set_drvdata() Commit 0998d06310 (device-core: Ensure drvdata = NULL when no driver is bound) removes the need to set driver data field to NULL. Signed-off-by: Sachin Kamat Cc: Rudolf Marek Signed-off-by: Guenter Roeck --- drivers/hwmon/coretemp.c | 2 -- 1 file changed, 2 deletions(-) (limited to 'drivers/hwmon') diff --git a/drivers/hwmon/coretemp.c b/drivers/hwmon/coretemp.c index 658ce3a8717..ade35cf3f48 100644 --- a/drivers/hwmon/coretemp.c +++ b/drivers/hwmon/coretemp.c @@ -578,7 +578,6 @@ static int coretemp_probe(struct platform_device *pdev) exit_name: device_remove_file(&pdev->dev, &pdata->name_attr); - platform_set_drvdata(pdev, NULL); exit_free: kfree(pdata); return err; @@ -595,7 +594,6 @@ static int coretemp_remove(struct platform_device *pdev) device_remove_file(&pdev->dev, &pdata->name_attr); hwmon_device_unregister(pdata->hwmon_dev); - platform_set_drvdata(pdev, NULL); kfree(pdata); return 0; } -- cgit v1.2.3-70-g09d2 From 15d2f565f2a935d828100fbaa1a6aecb800a2966 Mon Sep 17 00:00:00 2001 From: Sachin Kamat Date: Fri, 3 May 2013 15:13:38 +0530 Subject: hwmon: (i5k_amb) Remove redundant platform_set_drvdata() Commit 0998d06310 (device-core: Ensure drvdata = NULL when no driver is bound) removes the need to set driver data field to NULL. Signed-off-by: Sachin Kamat Cc: Darrick J. Wong Signed-off-by: Guenter Roeck --- drivers/hwmon/i5k_amb.c | 2 -- 1 file changed, 2 deletions(-) (limited to 'drivers/hwmon') diff --git a/drivers/hwmon/i5k_amb.c b/drivers/hwmon/i5k_amb.c index b87c2ccee06..de058c278aa 100644 --- a/drivers/hwmon/i5k_amb.c +++ b/drivers/hwmon/i5k_amb.c @@ -556,7 +556,6 @@ static int i5k_amb_probe(struct platform_device *pdev) err_init_failed: iounmap(data->amb_mmio); - platform_set_drvdata(pdev, NULL); err_map_failed: release_mem_region(data->amb_base, data->amb_len); err: @@ -576,7 +575,6 @@ static int i5k_amb_remove(struct platform_device *pdev) kfree(data->attrs); iounmap(data->amb_mmio); release_mem_region(data->amb_base, data->amb_len); - platform_set_drvdata(pdev, NULL); kfree(data); return 0; } -- cgit v1.2.3-70-g09d2 From 3a2af25d8477ea2ec1ffc046403b4b0ac8514348 Mon Sep 17 00:00:00 2001 From: Sachin Kamat Date: Fri, 3 May 2013 15:13:39 +0530 Subject: hwmon: (ntc_thermistor) Remove redundant platform_set_drvdata() Commit 0998d06310 (device-core: Ensure drvdata = NULL when no driver is bound) removes the need to set driver data field to NULL. Signed-off-by: Sachin Kamat Cc: MyungJoo Ham Acked-by: MyungJoo Ham Signed-off-by: Guenter Roeck --- drivers/hwmon/ntc_thermistor.c | 1 - 1 file changed, 1 deletion(-) (limited to 'drivers/hwmon') diff --git a/drivers/hwmon/ntc_thermistor.c b/drivers/hwmon/ntc_thermistor.c index d6d640a733d..830a842d796 100644 --- a/drivers/hwmon/ntc_thermistor.c +++ b/drivers/hwmon/ntc_thermistor.c @@ -514,7 +514,6 @@ static int ntc_thermistor_remove(struct platform_device *pdev) hwmon_device_unregister(data->hwmon_dev); sysfs_remove_group(&data->dev->kobj, &ntc_attr_group); ntc_iio_channel_release(pdata); - platform_set_drvdata(pdev, NULL); return 0; } -- cgit v1.2.3-70-g09d2 From cd275a5635511922f8b11f8a2a42b6d8b1e88237 Mon Sep 17 00:00:00 2001 From: Sachin Kamat Date: Fri, 3 May 2013 15:13:40 +0530 Subject: hwmon: (w83627ehf) Remove redundant platform_set_drvdata() Commit 0998d06310 (device-core: Ensure drvdata = NULL when no driver is bound) removes the need to set driver data field to NULL. Signed-off-by: Sachin Kamat Cc: Jean Delvare Signed-off-by: Guenter Roeck --- drivers/hwmon/w83627ehf.c | 2 -- 1 file changed, 2 deletions(-) (limited to 'drivers/hwmon') diff --git a/drivers/hwmon/w83627ehf.c b/drivers/hwmon/w83627ehf.c index 016027229e8..004801e6fbb 100644 --- a/drivers/hwmon/w83627ehf.c +++ b/drivers/hwmon/w83627ehf.c @@ -2598,7 +2598,6 @@ static int w83627ehf_probe(struct platform_device *pdev) exit_remove: w83627ehf_device_remove_files(dev); exit_release: - platform_set_drvdata(pdev, NULL); release_region(res->start, IOREGION_LENGTH); exit: return err; @@ -2611,7 +2610,6 @@ static int w83627ehf_remove(struct platform_device *pdev) hwmon_device_unregister(data->hwmon_dev); w83627ehf_device_remove_files(&pdev->dev); release_region(data->addr, IOREGION_LENGTH); - platform_set_drvdata(pdev, NULL); return 0; } -- cgit v1.2.3-70-g09d2 From cd6c8a4297ad036a155966db49982d6807e23ef8 Mon Sep 17 00:00:00 2001 From: Robert Coulson Date: Wed, 8 May 2013 22:45:53 -0700 Subject: hwmon: (ds1621) Add ds1721 chip support Update the ds1621 documentation, driver, and Kconfig with ds1721 chip support. Signed-off-by: Robert Coulson Signed-off-by: Guenter Roeck --- Documentation/hwmon/ds1621 | 26 +++++++--- drivers/hwmon/Kconfig | 9 ++-- drivers/hwmon/ds1621.c | 120 +++++++++++++++++++++++++++++++++++++++------ 3 files changed, 132 insertions(+), 23 deletions(-) (limited to 'drivers/hwmon') diff --git a/Documentation/hwmon/ds1621 b/Documentation/hwmon/ds1621 index 5e97f333c4d..d66f76f9d85 100644 --- a/Documentation/hwmon/ds1621 +++ b/Documentation/hwmon/ds1621 @@ -2,16 +2,22 @@ Kernel driver ds1621 ==================== Supported chips: - * Dallas Semiconductor DS1621 + * Dallas Semiconductor / Maxim Integrated DS1621 Prefix: 'ds1621' Addresses scanned: I2C 0x48 - 0x4f - Datasheet: Publicly available at the Dallas Semiconductor website - http://www.dalsemi.com/ + Datasheet: Publicly available from www.maximintegrated.com + * Dallas Semiconductor DS1625 - Prefix: 'ds1621' + Prefix: + 'ds1621' - if binding via _detect function + 'ds1625' - explicit instantiation + Addresses scanned: I2C 0x48 - 0x4f + Datasheet: Publicly available from www.datasheetarchive.com + + * Maxim Integrated DS1721 + Prefix: 'ds1721' Addresses scanned: I2C 0x48 - 0x4f - Datasheet: Publicly available at the Dallas Semiconductor website - http://www.dalsemi.com/ + Datasheet: Publicly available from www.maximintegrated.com Authors: Christian W. Zuckschwerdt @@ -61,3 +67,11 @@ with neither of the alarms set. Temperature conversion of the DS1621 takes up to 1000ms; internal access to non-volatile registers may last for 10ms or below. + +The DS1625 is pin compatible and functionally equivalent with the DS1621, +but the DS1621 is meant to replace it. + +The DS1721 is pin compatible with the DS1621, has an accuracy of +/- 1.0 +degree Celsius over a -10 to +85 degree range, a minimum/maximum alarm +default setting of 75 and 80 degrees respectively, and a maximum conversion +time of 750ms. diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index 0428e8a74b1..0114ed4b3c0 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig @@ -348,11 +348,14 @@ config SENSORS_DS620 will be called ds620. config SENSORS_DS1621 - tristate "Dallas Semiconductor DS1621 and DS1625" + tristate "Dallas Semiconductor DS1621 and compatibles" depends on I2C help - If you say yes here you get support for Dallas Semiconductor - DS1621 and DS1625 sensor chips. + If you say yes here you get support for Dallas Semiconductor/Maxim + Integrated DS1621 sensor chips and compatible models including: + + - Dallas Semiconductor DS1625 + - Maxim Integrated DS1721 This driver can also be built as a module. If so, the module will be called ds1621. diff --git a/drivers/hwmon/ds1621.c b/drivers/hwmon/ds1621.c index 1c568736baf..6942617666a 100644 --- a/drivers/hwmon/ds1621.c +++ b/drivers/hwmon/ds1621.c @@ -6,6 +6,19 @@ * Ported to Linux 2.6 by Aurelien Jarno with * the help of Jean Delvare * + * The DS1621 device is a digital temperature/thermometer with 9-bit + * resolution, a thermal alarm output (Tout), and user-defined minimum + * and maximum temperature thresholds (TH and TL). + * + * The DS1625 and DS1721 are pin compatible with the DS1621 and similar + * in operation, with slight variations as noted in the device + * datasheets (please refer to www.maximintegrated.com for specific + * device information). + * + * Since the DS1621 was the first chipset supported by this driver, + * most comments will refer to this chipset, but are actually general + * and concern all supported chipsets, unless mentioned otherwise. + * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or @@ -31,27 +44,62 @@ #include #include #include -#include "lm75.h" +#include /* Addresses to scan */ static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, I2C_CLIENT_END }; +/* Supported devices */ +enum chips { ds1621, ds1625, ds1721 }; + /* Insmod parameters */ static int polarity = -1; module_param(polarity, int, 0); MODULE_PARM_DESC(polarity, "Output's polarity: 0 = active high, 1 = active low"); -/* Many DS1621 constants specified below */ -/* Config register used for detection */ -/* 7 6 5 4 3 2 1 0 */ -/* |Done|THF |TLF |NVB | X | X |POL |1SHOT| */ +/* + * The Configuration/Status register + * + * - DS1621: + * 7 6 5 4 3 2 1 0 + * |Done|THF |TLF |NVB | X | X |POL |1SHOT| + * + * - DS1625: + * 7 6 5 4 3 2 1 0 + * |Done|THF |TLF |NVB | 1 | 0 |POL |1SHOT| + * + * - DS1721: + * 7 6 5 4 3 2 1 0 + * |Done| X | X | U | R1 | R0 |POL |1SHOT| + * + * Where: + * - 'X' is Reserved + * - 'U' is Undefined + */ #define DS1621_REG_CONFIG_NVB 0x10 +#define DS1621_REG_CONFIG_RESOL 0x0C #define DS1621_REG_CONFIG_POLARITY 0x02 #define DS1621_REG_CONFIG_1SHOT 0x01 #define DS1621_REG_CONFIG_DONE 0x80 -/* The DS1621 registers */ +#define DS1621_REG_CONFIG_RESOL_SHIFT 2 + +/* ds1721 conversion rates: {C/LSB, time(ms), resolution bit setting} */ +static const unsigned short ds1721_convrates[] = { + 94, /* 9-bits (0.5, 93.75, RES[0..1] = 0 */ + 188, /* 10-bits (0.25, 187.5, RES[0..1] = 1 */ + 375, /* 11-bits (0.125, 375, RES[0..1] = 2 */ + 750, /* 12-bits (0.0625, 750, RES[0..1] = 3 */ +}; + +#define DS1621_CONVERSION_MAX 750 +#define DS1625_CONVERSION_MAX 500 + +#define DS1621_TEMP_MAX 125000 +#define DS1621_TEMP_MIN (-55000) + +/* The DS1621 temperature registers */ static const u8 DS1621_REG_TEMP[3] = { 0xAA, /* input, word, RO */ 0xA2, /* min, word, RW */ @@ -59,6 +107,7 @@ static const u8 DS1621_REG_TEMP[3] = { }; #define DS1621_REG_CONF 0xAC /* byte, RW */ #define DS1621_COM_START 0xEE /* no data */ +#define DS1721_COM_START 0x51 /* no data */ #define DS1621_COM_STOP 0x22 /* no data */ /* The DS1621 configuration register */ @@ -75,14 +124,37 @@ struct ds1621_data { struct mutex update_lock; char valid; /* !=0 if following fields are valid */ unsigned long last_updated; /* In jiffies */ + enum chips kind; /* device type */ u16 temp[3]; /* Register values, word */ u8 conf; /* Register encoding, combined */ + u16 update_interval; /* Conversion rate in milliseconds */ }; +static inline int DS1621_TEMP_FROM_REG(u16 reg) +{ + return DIV_ROUND_CLOSEST(((s16)reg / 16) * 625, 10); +} + +/* + * TEMP: 0.001C/bit (-55C to +125C) + * REG: + * - 1621, 1625: x = 0.5C + * - 1721: x = 0.0625C + * Assume highest resolution and let the bits fall where they may.. + */ +static inline u16 DS1621_TEMP_TO_REG(long temp) +{ + int ntemp = clamp_val(temp, DS1621_TEMP_MIN, DS1621_TEMP_MAX); + ntemp += (ntemp < 0 ? -31 : 31); + ntemp = DIV_ROUND_CLOSEST(ntemp * 10, 625) << 4; + return (u16)ntemp; +} + static void ds1621_init_client(struct i2c_client *client) { - u8 conf, new_conf; + u8 conf, new_conf, sreg, resol; + struct ds1621_data *data = i2c_get_clientdata(client); new_conf = conf = i2c_smbus_read_byte_data(client, DS1621_REG_CONF); /* switch to continuous conversion mode */ @@ -97,8 +169,25 @@ static void ds1621_init_client(struct i2c_client *client) if (conf != new_conf) i2c_smbus_write_byte_data(client, DS1621_REG_CONF, new_conf); + switch (data->kind) { + case ds1625: + data->update_interval = DS1625_CONVERSION_MAX; + sreg = DS1621_COM_START; + break; + case ds1721: + resol = (new_conf & DS1621_REG_CONFIG_RESOL) >> + DS1621_REG_CONFIG_RESOL_SHIFT; + data->update_interval = ds1721_convrates[resol]; + sreg = DS1721_COM_START; + break; + default: + data->update_interval = DS1621_CONVERSION_MAX; + sreg = DS1621_COM_START; + break; + } + /* start conversion */ - i2c_smbus_write_byte(client, DS1621_COM_START); + i2c_smbus_write_byte(client, sreg); } static struct ds1621_data *ds1621_update_client(struct device *dev) @@ -109,8 +198,8 @@ static struct ds1621_data *ds1621_update_client(struct device *dev) mutex_lock(&data->update_lock); - if (time_after(jiffies, data->last_updated + HZ + HZ / 2) - || !data->valid) { + if (time_after(jiffies, data->last_updated + data->update_interval) || + !data->valid) { int i; dev_dbg(&client->dev, "Starting ds1621 update\n"); @@ -146,7 +235,7 @@ static ssize_t show_temp(struct device *dev, struct device_attribute *da, struct sensor_device_attribute *attr = to_sensor_dev_attr(da); struct ds1621_data *data = ds1621_update_client(dev); return sprintf(buf, "%d\n", - LM75_TEMP_FROM_REG(data->temp[attr->index])); + DS1621_TEMP_FROM_REG(data->temp[attr->index])); } static ssize_t set_temp(struct device *dev, struct device_attribute *da, @@ -163,7 +252,7 @@ static ssize_t set_temp(struct device *dev, struct device_attribute *da, return err; mutex_lock(&data->update_lock); - data->temp[attr->index] = LM75_TEMP_TO_REG(val); + data->temp[attr->index] = DS1621_TEMP_TO_REG(val); i2c_smbus_write_word_swapped(client, DS1621_REG_TEMP[attr->index], data->temp[attr->index]); mutex_unlock(&data->update_lock); @@ -257,6 +346,8 @@ static int ds1621_probe(struct i2c_client *client, i2c_set_clientdata(client, data); mutex_init(&data->update_lock); + data->kind = id->driver_data; + /* Initialize the DS1621 chip */ ds1621_init_client(client); @@ -289,8 +380,9 @@ static int ds1621_remove(struct i2c_client *client) } static const struct i2c_device_id ds1621_id[] = { - { "ds1621", 0 }, - { "ds1625", 0 }, + { "ds1621", ds1621 }, + { "ds1625", ds1625 }, + { "ds1721", ds1721 }, { } }; MODULE_DEVICE_TABLE(i2c, ds1621_id); -- cgit v1.2.3-70-g09d2 From 3a8fe3315571e896489d2e271ffe7f935bfc5ce8 Mon Sep 17 00:00:00 2001 From: Robert Coulson Date: Wed, 8 May 2013 22:45:54 -0700 Subject: hwmon: (ds1621) Add ds1721 update interval sysfs attribute The ds1721 device can be configured for 9..12 bit resolutions; add a sysfs attribute for userspace to configure this attribute. The definition, description, details, and usage are shown in the documentation and were crafted from an LM73 driver patch done by Chris Verges & Guenter Roeck). Signed-off-by: Robert Coulson Signed-off-by: Guenter Roeck --- Documentation/hwmon/ds1621 | 65 ++++++++++++++++++++++++++++++++++++++++++++++ drivers/hwmon/ds1621.c | 56 +++++++++++++++++++++++++++++++++++++++ 2 files changed, 121 insertions(+) (limited to 'drivers/hwmon') diff --git a/Documentation/hwmon/ds1621 b/Documentation/hwmon/ds1621 index d66f76f9d85..b61e77c6b1c 100644 --- a/Documentation/hwmon/ds1621 +++ b/Documentation/hwmon/ds1621 @@ -75,3 +75,68 @@ The DS1721 is pin compatible with the DS1621, has an accuracy of +/- 1.0 degree Celsius over a -10 to +85 degree range, a minimum/maximum alarm default setting of 75 and 80 degrees respectively, and a maximum conversion time of 750ms. + +In addition, the DS1721 supports four resolution settings from 9 to 12 bits +(defined in degrees C per LSB: 0.5, 0.25, 0.125, and 0.0625, respectifully), +that are set at device power on to the highest resolution: 12-bits (0.0625 degree C). + +Changing the DS1721 resolution mode affects the conversion time and can be +done from userspace, via the device 'update_interval' sysfs attribute. This +attribute will normalize range of input values to the device maximum resolution +values defined in the datasheet as such: + +Resolution Conversion Time Input Range + (C/LSB) (msec) (msec) +-------------------------------------------- +0.5 93.75 0....94 +0.25 187.5 95...187 +0.125 375 188..375 +0.0625 750 376..infinity +-------------------------------------- + +The following examples show how the 'update_interval' attribute can be +used to change the conversion time: + +$ cat update_interval +750 +$ cat temp1_input +22062 +$ +$ echo 300 > update_interval +$ cat update_interval +375 +$ cat temp1_input +22125 +$ +$ echo 150 > update_interval +$ cat update_interval +188 +$ cat temp1_input +22250 +$ +$ echo 1 > update_interval +$ cat update_interval +94 +$ cat temp1_input +22000 +$ +$ echo 1000 > update_interval +$ cat update_interval +750 +$ cat temp1_input +22062 +$ + +As shown, the ds1621 driver automatically adjusts the 'update_interval' +user input, via a step function. Reading back the 'update_interval' value +after a write operation provides the conversion time used by the device. + +Mathematically, the resolution can be derived from the conversion time +via the following function: + + g(x) = 0.5 * [minimum_conversion_time/x] + +where: + -> 'x' = the output from 'update_interval' + -> 'g(x)' = the resolution in degrees C per LSB. + -> 93.75ms = minimum conversion time diff --git a/drivers/hwmon/ds1621.c b/drivers/hwmon/ds1621.c index 6942617666a..b5d80fb851d 100644 --- a/drivers/hwmon/ds1621.c +++ b/drivers/hwmon/ds1621.c @@ -274,7 +274,47 @@ static ssize_t show_alarm(struct device *dev, struct device_attribute *da, return sprintf(buf, "%d\n", !!(data->conf & attr->index)); } +static ssize_t show_convrate(struct device *dev, struct device_attribute *da, + char *buf) +{ + struct i2c_client *client = to_i2c_client(dev); + struct ds1621_data *data = i2c_get_clientdata(client); + return scnprintf(buf, PAGE_SIZE, "%hu\n", data->update_interval); +} + +static ssize_t set_convrate(struct device *dev, struct device_attribute *da, + const char *buf, size_t count) +{ + struct i2c_client *client = to_i2c_client(dev); + struct ds1621_data *data = i2c_get_clientdata(client); + unsigned long convrate; + s32 err; + int resol = 0; + + err = kstrtoul(buf, 10, &convrate); + if (err) + return err; + + /* Convert rate into resolution bits */ + while (resol < (ARRAY_SIZE(ds1721_convrates) - 1) && + convrate > ds1721_convrates[resol]) + resol++; + + mutex_lock(&data->update_lock); + data->conf = i2c_smbus_read_byte_data(client, DS1621_REG_CONF); + data->conf &= ~DS1621_REG_CONFIG_RESOL; + data->conf |= (resol << DS1621_REG_CONFIG_RESOL_SHIFT); + i2c_smbus_write_byte_data(client, DS1621_REG_CONF, data->conf); + data->update_interval = ds1721_convrates[resol]; + mutex_unlock(&data->update_lock); + + return count; +} + static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); +static DEVICE_ATTR(update_interval, S_IWUSR | S_IRUGO, show_convrate, + set_convrate); + static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0); static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp, set_temp, 1); static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp, set_temp, 2); @@ -290,11 +330,27 @@ static struct attribute *ds1621_attributes[] = { &sensor_dev_attr_temp1_min_alarm.dev_attr.attr, &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, &dev_attr_alarms.attr, + &dev_attr_update_interval.attr, NULL }; +static umode_t ds1621_attribute_visible(struct kobject *kobj, + struct attribute *attr, int index) +{ + struct device *dev = container_of(kobj, struct device, kobj); + struct i2c_client *client = to_i2c_client(dev); + struct ds1621_data *data = i2c_get_clientdata(client); + + if (attr == &dev_attr_update_interval.attr) + if (data->kind != ds1721) + /* shhh, we're hiding update_interval */ + return 0; + return attr->mode; +} + static const struct attribute_group ds1621_group = { .attrs = ds1621_attributes, + .is_visible = ds1621_attribute_visible }; -- cgit v1.2.3-70-g09d2 From 79c1cc1c90c0ccaddd20965ea19205c54addd5f7 Mon Sep 17 00:00:00 2001 From: Robert Coulson Date: Thu, 16 May 2013 15:10:41 -0700 Subject: hwmon: (ds1621) Add ds1631 chip support to ds1621 driver and documentation Add definitions, information, and code for ds1631 chip support to the ds1621 driver. Signed-off-by: Robert Coulson Signed-off-by: Guenter Roeck --- Documentation/hwmon/ds1621 | 27 ++++++++++++++++++++++++--- drivers/hwmon/Kconfig | 1 + drivers/hwmon/ds1621.c | 27 ++++++++++++++++++++------- 3 files changed, 45 insertions(+), 10 deletions(-) (limited to 'drivers/hwmon') diff --git a/Documentation/hwmon/ds1621 b/Documentation/hwmon/ds1621 index b61e77c6b1c..1ebaa248577 100644 --- a/Documentation/hwmon/ds1621 +++ b/Documentation/hwmon/ds1621 @@ -14,6 +14,11 @@ Supported chips: Addresses scanned: I2C 0x48 - 0x4f Datasheet: Publicly available from www.datasheetarchive.com + * Maxim Integrated DS1631 + Prefix: 'ds1631' + Addresses scanned: I2C 0x48 - 0x4f + Datasheet: Publicly available from www.maximintegrated.com + * Maxim Integrated DS1721 Prefix: 'ds1721' Addresses scanned: I2C 0x48 - 0x4f @@ -69,7 +74,15 @@ Temperature conversion of the DS1621 takes up to 1000ms; internal access to non-volatile registers may last for 10ms or below. The DS1625 is pin compatible and functionally equivalent with the DS1621, -but the DS1621 is meant to replace it. +but the DS1621 is meant to replace it. The DS1631 and DS1721 are also +pin compatible with the DS1621, but provide multi-resolution support. + +Since there is no version register, there is no unique identification +for these devices. In addition, the DS1631 and DS1721 will emulate a +DS1621 device, if not explicitly instantiated (why? because the detect +function compares the temperature register values bits and checks for a +9-bit resolution). Therefore, for correct device identification and +functionality, explicit device instantiation is required. The DS1721 is pin compatible with the DS1621, has an accuracy of +/- 1.0 degree Celsius over a -10 to +85 degree range, a minimum/maximum alarm @@ -78,9 +91,17 @@ time of 750ms. In addition, the DS1721 supports four resolution settings from 9 to 12 bits (defined in degrees C per LSB: 0.5, 0.25, 0.125, and 0.0625, respectifully), -that are set at device power on to the highest resolution: 12-bits (0.0625 degree C). +that are set at device power on to the highest resolution: 12-bits. + +One additional note about the ds1721 is that although the data sheet says +the temperature flags (THF and TLF) are used internally, these flags do +get set and cleared as the actual temperature crosses the min or max settings. + +The DS1631 is also pin compatible with the DS1621 and feature compatible with +the DS1721, however the DS1631 accuracy is +/- 0.5 degree Celsius over the +same range. -Changing the DS1721 resolution mode affects the conversion time and can be +Changing the DS1631/1721 resolution mode affects the conversion time and can be done from userspace, via the device 'update_interval' sysfs attribute. This attribute will normalize range of input values to the device maximum resolution values defined in the datasheet as such: diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index 0114ed4b3c0..4f713705d37 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig @@ -355,6 +355,7 @@ config SENSORS_DS1621 Integrated DS1621 sensor chips and compatible models including: - Dallas Semiconductor DS1625 + - Maxim Integrated DS1631 - Maxim Integrated DS1721 This driver can also be built as a module. If so, the module diff --git a/drivers/hwmon/ds1621.c b/drivers/hwmon/ds1621.c index b5d80fb851d..98adf77fdc8 100644 --- a/drivers/hwmon/ds1621.c +++ b/drivers/hwmon/ds1621.c @@ -10,8 +10,8 @@ * resolution, a thermal alarm output (Tout), and user-defined minimum * and maximum temperature thresholds (TH and TL). * - * The DS1625 and DS1721 are pin compatible with the DS1621 and similar - * in operation, with slight variations as noted in the device + * The DS1625, DS1631, and DS1721 are pin compatible with the DS1621 and + * similar in operation, with slight variations as noted in the device * datasheets (please refer to www.maximintegrated.com for specific * device information). * @@ -51,7 +51,7 @@ static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, I2C_CLIENT_END }; /* Supported devices */ -enum chips { ds1621, ds1625, ds1721 }; +enum chips { ds1621, ds1625, ds1631, ds1721 }; /* Insmod parameters */ static int polarity = -1; @@ -69,6 +69,10 @@ MODULE_PARM_DESC(polarity, "Output's polarity: 0 = active high, 1 = active low") * 7 6 5 4 3 2 1 0 * |Done|THF |TLF |NVB | 1 | 0 |POL |1SHOT| * + * - DS1631: + * 7 6 5 4 3 2 1 0 + * |Done|THF |TLF |NVB | R1 | R0 |POL |1SHOT| + * * - DS1721: * 7 6 5 4 3 2 1 0 * |Done| X | X | U | R1 | R0 |POL |1SHOT| @@ -139,8 +143,8 @@ static inline int DS1621_TEMP_FROM_REG(u16 reg) /* * TEMP: 0.001C/bit (-55C to +125C) * REG: - * - 1621, 1625: x = 0.5C - * - 1721: x = 0.0625C + * - 1621, 1625: 0.5C/bit + * - 1631, 1721: 0.0625C/bit * Assume highest resolution and let the bits fall where they may.. */ static inline u16 DS1621_TEMP_TO_REG(long temp) @@ -174,6 +178,7 @@ static void ds1621_init_client(struct i2c_client *client) data->update_interval = DS1625_CONVERSION_MAX; sreg = DS1621_COM_START; break; + case ds1631: case ds1721: resol = (new_conf & DS1621_REG_CONFIG_RESOL) >> DS1621_REG_CONFIG_RESOL_SHIFT; @@ -342,7 +347,7 @@ static umode_t ds1621_attribute_visible(struct kobject *kobj, struct ds1621_data *data = i2c_get_clientdata(client); if (attr == &dev_attr_update_interval.attr) - if (data->kind != ds1721) + if (data->kind == ds1621 || data->kind == ds1625) /* shhh, we're hiding update_interval */ return 0; return attr->mode; @@ -376,7 +381,14 @@ static int ds1621_detect(struct i2c_client *client, conf = i2c_smbus_read_byte_data(client, DS1621_REG_CONF); if (conf < 0 || conf & DS1621_REG_CONFIG_NVB) return -ENODEV; - /* The 7 lowest bits of a temperature should always be 0. */ + /* + * The ds1621 & ds1625 use 9-bit resolution, so the 7 lowest bits + * of the temperature should always be 0 (NOTE: The other chips + * have multi-resolution support, so if they have 9-bit resolution + * configured and the min/max temperature values set accordingly, + * then if not explicitly instantiated, they *will* appear as and + * emulate a ds1621 device). + */ for (i = 0; i < ARRAY_SIZE(DS1621_REG_TEMP); i++) { temp = i2c_smbus_read_word_data(client, DS1621_REG_TEMP[i]); if (temp < 0 || (temp & 0x7f00)) @@ -438,6 +450,7 @@ static int ds1621_remove(struct i2c_client *client) static const struct i2c_device_id ds1621_id[] = { { "ds1621", ds1621 }, { "ds1625", ds1625 }, + { "ds1631", ds1631 }, { "ds1721", ds1721 }, { } }; -- cgit v1.2.3-70-g09d2 From ed7c34e89d1e9d07f787a51571be0b96ae93d678 Mon Sep 17 00:00:00 2001 From: Robert Coulson Date: Thu, 23 May 2013 09:22:22 -0700 Subject: hwmon: (ds1621) Remove detect function Due to a lack of device and vendor identification registers, the Dallas/Maxim DS16xx devices cannot be uniquely detected, sometimes resulting in false positives. Therefore, the detect function is being removed in favor of explicit device instantiation. Signed-off-by: Robert Coulson Acked-by: Jean Delvare Signed-off-by: Guenter Roeck --- Documentation/hwmon/ds1621 | 25 ++++++++++++------------ drivers/hwmon/ds1621.c | 48 ---------------------------------------------- 2 files changed, 12 insertions(+), 61 deletions(-) (limited to 'drivers/hwmon') diff --git a/Documentation/hwmon/ds1621 b/Documentation/hwmon/ds1621 index 1ebaa248577..83780660f5b 100644 --- a/Documentation/hwmon/ds1621 +++ b/Documentation/hwmon/ds1621 @@ -4,24 +4,22 @@ Kernel driver ds1621 Supported chips: * Dallas Semiconductor / Maxim Integrated DS1621 Prefix: 'ds1621' - Addresses scanned: I2C 0x48 - 0x4f + Addresses scanned: none Datasheet: Publicly available from www.maximintegrated.com * Dallas Semiconductor DS1625 - Prefix: - 'ds1621' - if binding via _detect function - 'ds1625' - explicit instantiation - Addresses scanned: I2C 0x48 - 0x4f + Prefix: 'ds1625' + Addresses scanned: none Datasheet: Publicly available from www.datasheetarchive.com * Maxim Integrated DS1631 Prefix: 'ds1631' - Addresses scanned: I2C 0x48 - 0x4f + Addresses scanned: none Datasheet: Publicly available from www.maximintegrated.com * Maxim Integrated DS1721 Prefix: 'ds1721' - Addresses scanned: I2C 0x48 - 0x4f + Addresses scanned: none Datasheet: Publicly available from www.maximintegrated.com Authors: @@ -77,12 +75,13 @@ The DS1625 is pin compatible and functionally equivalent with the DS1621, but the DS1621 is meant to replace it. The DS1631 and DS1721 are also pin compatible with the DS1621, but provide multi-resolution support. -Since there is no version register, there is no unique identification -for these devices. In addition, the DS1631 and DS1721 will emulate a -DS1621 device, if not explicitly instantiated (why? because the detect -function compares the temperature register values bits and checks for a -9-bit resolution). Therefore, for correct device identification and -functionality, explicit device instantiation is required. +Since there is no version or vendor identification register, there is +no unique identification for these devices. Therefore, explicit device +instantiation is required for correct device identification and functionality. + +And, for correct identification and operation, each device must be +explicitly instantiated, one device per address, in this address +range: 0x48..0x4f. The DS1721 is pin compatible with the DS1621, has an accuracy of +/- 1.0 degree Celsius over a -10 to +85 degree range, a minimum/maximum alarm diff --git a/drivers/hwmon/ds1621.c b/drivers/hwmon/ds1621.c index 98adf77fdc8..8e940ad9cb3 100644 --- a/drivers/hwmon/ds1621.c +++ b/drivers/hwmon/ds1621.c @@ -46,10 +46,6 @@ #include #include -/* Addresses to scan */ -static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c, - 0x4d, 0x4e, 0x4f, I2C_CLIENT_END }; - /* Supported devices */ enum chips { ds1621, ds1625, ds1631, ds1721 }; @@ -358,48 +354,6 @@ static const struct attribute_group ds1621_group = { .is_visible = ds1621_attribute_visible }; - -/* Return 0 if detection is successful, -ENODEV otherwise */ -static int ds1621_detect(struct i2c_client *client, - struct i2c_board_info *info) -{ - struct i2c_adapter *adapter = client->adapter; - int conf, temp; - int i; - - if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA - | I2C_FUNC_SMBUS_WORD_DATA - | I2C_FUNC_SMBUS_WRITE_BYTE)) - return -ENODEV; - - /* - * Now, we do the remaining detection. It is lousy. - * - * The NVB bit should be low if no EEPROM write has been requested - * during the latest 10ms, which is highly improbable in our case. - */ - conf = i2c_smbus_read_byte_data(client, DS1621_REG_CONF); - if (conf < 0 || conf & DS1621_REG_CONFIG_NVB) - return -ENODEV; - /* - * The ds1621 & ds1625 use 9-bit resolution, so the 7 lowest bits - * of the temperature should always be 0 (NOTE: The other chips - * have multi-resolution support, so if they have 9-bit resolution - * configured and the min/max temperature values set accordingly, - * then if not explicitly instantiated, they *will* appear as and - * emulate a ds1621 device). - */ - for (i = 0; i < ARRAY_SIZE(DS1621_REG_TEMP); i++) { - temp = i2c_smbus_read_word_data(client, DS1621_REG_TEMP[i]); - if (temp < 0 || (temp & 0x7f00)) - return -ENODEV; - } - - strlcpy(info->type, "ds1621", I2C_NAME_SIZE); - - return 0; -} - static int ds1621_probe(struct i2c_client *client, const struct i2c_device_id *id) { @@ -465,8 +419,6 @@ static struct i2c_driver ds1621_driver = { .probe = ds1621_probe, .remove = ds1621_remove, .id_table = ds1621_id, - .detect = ds1621_detect, - .address_list = normal_i2c, }; module_i2c_driver(ds1621_driver); -- cgit v1.2.3-70-g09d2 From 68146a5712baeae2ba4885bd53d5d56bfd6024ba Mon Sep 17 00:00:00 2001 From: Guenter Roeck Date: Thu, 6 Jun 2013 10:30:10 -0700 Subject: hwmon: (adm1021) Do not create min sysfs attributes for LM84 LM84 does not support minimum temperature registers. Only create the respective sysfs attributes for other chips. Signed-off-by: Guenter Roeck Acked-by: Jean Delvare --- drivers/hwmon/adm1021.c | 32 +++++++++++++++++++++++++------- 1 file changed, 25 insertions(+), 7 deletions(-) (limited to 'drivers/hwmon') diff --git a/drivers/hwmon/adm1021.c b/drivers/hwmon/adm1021.c index f920619cd6d..29dd9f746df 100644 --- a/drivers/hwmon/adm1021.c +++ b/drivers/hwmon/adm1021.c @@ -284,15 +284,11 @@ static DEVICE_ATTR(low_power, S_IWUSR | S_IRUGO, show_low_power, set_low_power); static struct attribute *adm1021_attributes[] = { &sensor_dev_attr_temp1_max.dev_attr.attr, - &sensor_dev_attr_temp1_min.dev_attr.attr, &sensor_dev_attr_temp1_input.dev_attr.attr, &sensor_dev_attr_temp2_max.dev_attr.attr, - &sensor_dev_attr_temp2_min.dev_attr.attr, &sensor_dev_attr_temp2_input.dev_attr.attr, &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, - &sensor_dev_attr_temp1_min_alarm.dev_attr.attr, &sensor_dev_attr_temp2_max_alarm.dev_attr.attr, - &sensor_dev_attr_temp2_min_alarm.dev_attr.attr, &sensor_dev_attr_temp2_fault.dev_attr.attr, &dev_attr_alarms.attr, &dev_attr_low_power.attr, @@ -303,6 +299,18 @@ static const struct attribute_group adm1021_group = { .attrs = adm1021_attributes, }; +static struct attribute *adm1021_min_attributes[] = { + &sensor_dev_attr_temp1_min.dev_attr.attr, + &sensor_dev_attr_temp2_min.dev_attr.attr, + &sensor_dev_attr_temp1_min_alarm.dev_attr.attr, + &sensor_dev_attr_temp2_min_alarm.dev_attr.attr, + NULL +}; + +static const struct attribute_group adm1021_min_group = { + .attrs = adm1021_min_attributes, +}; + /* Return 0 if detection is successful, -ENODEV otherwise */ static int adm1021_detect(struct i2c_client *client, struct i2c_board_info *info) @@ -425,6 +433,12 @@ static int adm1021_probe(struct i2c_client *client, if (err) return err; + if (data->type != lm84) { + err = sysfs_create_group(&client->dev.kobj, &adm1021_min_group); + if (err) + goto error; + } + data->hwmon_dev = hwmon_device_register(&client->dev); if (IS_ERR(data->hwmon_dev)) { err = PTR_ERR(data->hwmon_dev); @@ -434,6 +448,7 @@ static int adm1021_probe(struct i2c_client *client, return 0; error: + sysfs_remove_group(&client->dev.kobj, &adm1021_min_group); sysfs_remove_group(&client->dev.kobj, &adm1021_group); return err; } @@ -452,6 +467,7 @@ static int adm1021_remove(struct i2c_client *client) struct adm1021_data *data = i2c_get_clientdata(client); hwmon_device_unregister(data->hwmon_dev); + sysfs_remove_group(&client->dev.kobj, &adm1021_min_group); sysfs_remove_group(&client->dev.kobj, &adm1021_group); return 0; @@ -477,9 +493,11 @@ static struct adm1021_data *adm1021_update_device(struct device *dev) data->temp_max[i] = 1000 * (s8) i2c_smbus_read_byte_data( client, ADM1021_REG_TOS_R(i)); - data->temp_min[i] = 1000 * - (s8) i2c_smbus_read_byte_data( - client, ADM1021_REG_THYST_R(i)); + if (data->type != lm84) { + data->temp_min[i] = 1000 * + (s8) i2c_smbus_read_byte_data(client, + ADM1021_REG_THYST_R(i)); + } } data->alarms = i2c_smbus_read_byte_data(client, ADM1021_REG_STATUS) & 0x7c; -- cgit v1.2.3-70-g09d2 From 2ec2819623521c28de3ab5d6e1f096542d032246 Mon Sep 17 00:00:00 2001 From: Sebastian Andrzej Siewior Date: Mon, 10 Jun 2013 17:47:45 +0200 Subject: hwmon: (iio_hwmon) add alias table This helps the kernel to find the right module once the device is created. Signed-off-by: Sebastian Andrzej Siewior Signed-off-by: Guenter Roeck --- drivers/hwmon/iio_hwmon.c | 1 + 1 file changed, 1 insertion(+) (limited to 'drivers/hwmon') diff --git a/drivers/hwmon/iio_hwmon.c b/drivers/hwmon/iio_hwmon.c index 52b77afebde..708081b68c6 100644 --- a/drivers/hwmon/iio_hwmon.c +++ b/drivers/hwmon/iio_hwmon.c @@ -180,6 +180,7 @@ static struct of_device_id iio_hwmon_of_match[] = { { .compatible = "iio-hwmon", }, { } }; +MODULE_DEVICE_TABLE(of, iio_hwmon_of_match); static struct platform_driver __refdata iio_hwmon_driver = { .driver = { -- cgit v1.2.3-70-g09d2 From 260f81ffc1b9f09dde355caa09e4b312756666f0 Mon Sep 17 00:00:00 2001 From: Robert Coulson Date: Mon, 10 Jun 2013 18:46:02 -0700 Subject: hwmon: (ds1621) Add DS1731 chip support to ds1621 driver These changes add DS1731 chip support to the ds1621 driver, Kconfig, and documentation. Signed-off-by: Robert Coulson Signed-off-by: Guenter Roeck --- Documentation/hwmon/ds1621 | 31 ++++++++++++++++++------------- drivers/hwmon/Kconfig | 1 + drivers/hwmon/ds1621.c | 12 +++++++----- 3 files changed, 26 insertions(+), 18 deletions(-) (limited to 'drivers/hwmon') diff --git a/Documentation/hwmon/ds1621 b/Documentation/hwmon/ds1621 index 83780660f5b..c0817f7934e 100644 --- a/Documentation/hwmon/ds1621 +++ b/Documentation/hwmon/ds1621 @@ -22,6 +22,11 @@ Supported chips: Addresses scanned: none Datasheet: Publicly available from www.maximintegrated.com + * Maxim Integrated DS1731 + Prefix: 'ds1731' + Addresses scanned: none + Datasheet: Publicly available from www.maximintegrated.com + Authors: Christian W. Zuckschwerdt valuable contributions by Jan M. Sendler @@ -72,8 +77,8 @@ Temperature conversion of the DS1621 takes up to 1000ms; internal access to non-volatile registers may last for 10ms or below. The DS1625 is pin compatible and functionally equivalent with the DS1621, -but the DS1621 is meant to replace it. The DS1631 and DS1721 are also -pin compatible with the DS1621, but provide multi-resolution support. +but the DS1621 is meant to replace it. The DS1631, DS1721, and DS1731 are +also pin compatible with the DS1621, but provide multi-resolution support. Since there is no version or vendor identification register, there is no unique identification for these devices. Therefore, explicit device @@ -84,26 +89,26 @@ explicitly instantiated, one device per address, in this address range: 0x48..0x4f. The DS1721 is pin compatible with the DS1621, has an accuracy of +/- 1.0 -degree Celsius over a -10 to +85 degree range, a minimum/maximum alarm -default setting of 75 and 80 degrees respectively, and a maximum conversion -time of 750ms. +degree Celsius (from -10 to +85 degrees), a minimum/maximum alarm default +setting of 75 and 80 degrees, and a maximum conversion time of 750ms. In addition, the DS1721 supports four resolution settings from 9 to 12 bits -(defined in degrees C per LSB: 0.5, 0.25, 0.125, and 0.0625, respectifully), +(defined in degrees C per LSB: 0.5, 0.25, 0.125, and 0.0625, respectively), that are set at device power on to the highest resolution: 12-bits. One additional note about the ds1721 is that although the data sheet says the temperature flags (THF and TLF) are used internally, these flags do get set and cleared as the actual temperature crosses the min or max settings. -The DS1631 is also pin compatible with the DS1621 and feature compatible with -the DS1721, however the DS1631 accuracy is +/- 0.5 degree Celsius over the -same range. +The DS1631 and DS1731 are pin compatible with the DS1621 and feature compatible +with the DS1721. However, the DS1631 accuracy is +/- 0.5 degree Celsius (from 0 +to +70 degrees), while the DS1731 accuracy is +/-1 degree Celsius (from -10 to ++85 degrees). -Changing the DS1631/1721 resolution mode affects the conversion time and can be -done from userspace, via the device 'update_interval' sysfs attribute. This -attribute will normalize range of input values to the device maximum resolution -values defined in the datasheet as such: +The resolution mode for the DS1631, DS1721, or DS1731 can be changed from +userspace, via the device 'update_interval' sysfs attribute. This attribute +will normalize the range of input values to the device maximum resolution +values defined in the datasheet as follows: Resolution Conversion Time Input Range (C/LSB) (msec) (msec) diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index 4f713705d37..683c769a8fc 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig @@ -357,6 +357,7 @@ config SENSORS_DS1621 - Dallas Semiconductor DS1625 - Maxim Integrated DS1631 - Maxim Integrated DS1721 + - Maxim Integrated DS1731 This driver can also be built as a module. If so, the module will be called ds1621. diff --git a/drivers/hwmon/ds1621.c b/drivers/hwmon/ds1621.c index 8e940ad9cb3..591758bb629 100644 --- a/drivers/hwmon/ds1621.c +++ b/drivers/hwmon/ds1621.c @@ -10,8 +10,8 @@ * resolution, a thermal alarm output (Tout), and user-defined minimum * and maximum temperature thresholds (TH and TL). * - * The DS1625, DS1631, and DS1721 are pin compatible with the DS1621 and - * similar in operation, with slight variations as noted in the device + * The DS1625, DS1631, DS1721, and DS1731 are pin compatible with the DS1621 + * and similar in operation, with slight variations as noted in the device * datasheets (please refer to www.maximintegrated.com for specific * device information). * @@ -47,7 +47,7 @@ #include /* Supported devices */ -enum chips { ds1621, ds1625, ds1631, ds1721 }; +enum chips { ds1621, ds1625, ds1631, ds1721, ds1731 }; /* Insmod parameters */ static int polarity = -1; @@ -65,7 +65,7 @@ MODULE_PARM_DESC(polarity, "Output's polarity: 0 = active high, 1 = active low") * 7 6 5 4 3 2 1 0 * |Done|THF |TLF |NVB | 1 | 0 |POL |1SHOT| * - * - DS1631: + * - DS1631, DS1731: * 7 6 5 4 3 2 1 0 * |Done|THF |TLF |NVB | R1 | R0 |POL |1SHOT| * @@ -140,7 +140,7 @@ static inline int DS1621_TEMP_FROM_REG(u16 reg) * TEMP: 0.001C/bit (-55C to +125C) * REG: * - 1621, 1625: 0.5C/bit - * - 1631, 1721: 0.0625C/bit + * - 1631, 1721, 1731: 0.0625C/bit * Assume highest resolution and let the bits fall where they may.. */ static inline u16 DS1621_TEMP_TO_REG(long temp) @@ -176,6 +176,7 @@ static void ds1621_init_client(struct i2c_client *client) break; case ds1631: case ds1721: + case ds1731: resol = (new_conf & DS1621_REG_CONFIG_RESOL) >> DS1621_REG_CONFIG_RESOL_SHIFT; data->update_interval = ds1721_convrates[resol]; @@ -406,6 +407,7 @@ static const struct i2c_device_id ds1621_id[] = { { "ds1625", ds1625 }, { "ds1631", ds1631 }, { "ds1721", ds1721 }, + { "ds1731", ds1731 }, { } }; MODULE_DEVICE_TABLE(i2c, ds1621_id); -- cgit v1.2.3-70-g09d2 From 31e7ad74f6044ffec112fd4975c07b797589d89c Mon Sep 17 00:00:00 2001 From: Tang Yuantian Date: Wed, 19 Jun 2013 14:50:20 +0800 Subject: hwmon: (ina2xx) Add device tree support to pass the shunt resistor Adding another way that is device tree to pass the shunt resistor value to driver except for platform data. Signed-off-by: Tang Yuantian [Guenter Roeck: Added missing of.h include] Signed-off-by: Guenter Roeck --- Documentation/devicetree/bindings/i2c/ina2xx.txt | 22 ++++++++++++++++++++++ Documentation/hwmon/ina2xx | 4 +++- drivers/hwmon/ina2xx.c | 5 +++++ 3 files changed, 30 insertions(+), 1 deletion(-) create mode 100644 Documentation/devicetree/bindings/i2c/ina2xx.txt (limited to 'drivers/hwmon') diff --git a/Documentation/devicetree/bindings/i2c/ina2xx.txt b/Documentation/devicetree/bindings/i2c/ina2xx.txt new file mode 100644 index 00000000000..a2ad85d7e74 --- /dev/null +++ b/Documentation/devicetree/bindings/i2c/ina2xx.txt @@ -0,0 +1,22 @@ +ina2xx properties + +Required properties: +- compatible: Must be one of the following: + - "ti,ina219" for ina219 + - "ti,ina220" for ina220 + - "ti,ina226" for ina226 + - "ti,ina230" for ina230 +- reg: I2C address + +Optional properties: + +- shunt-resistor + Shunt resistor value in micro-Ohm + +Example: + +ina220@44 { + compatible = "ti,ina220"; + reg = <0x44>; + shunt-resistor = <1000>; +}; diff --git a/Documentation/hwmon/ina2xx b/Documentation/hwmon/ina2xx index 03444f9d833..4223c2d3b50 100644 --- a/Documentation/hwmon/ina2xx +++ b/Documentation/hwmon/ina2xx @@ -44,4 +44,6 @@ The INA226 monitors both a shunt voltage drop and bus supply voltage. The INA230 is a high or low side current shunt and power monitor with an I2C interface. The INA230 monitors both a shunt voltage drop and bus supply voltage. -The shunt value in micro-ohms can be set via platform data. +The shunt value in micro-ohms can be set via platform data or device tree. +Please refer to the Documentation/devicetree/bindings/i2c/ina2xx.txt for bindings +if the device tree is used. diff --git a/drivers/hwmon/ina2xx.c b/drivers/hwmon/ina2xx.c index 4958b2f89dc..d917a2d8c30 100644 --- a/drivers/hwmon/ina2xx.c +++ b/drivers/hwmon/ina2xx.c @@ -34,6 +34,7 @@ #include #include #include +#include #include @@ -221,6 +222,7 @@ static int ina2xx_probe(struct i2c_client *client, struct ina2xx_data *data; struct ina2xx_platform_data *pdata; int ret; + u32 val; long shunt = 10000; /* default shunt value 10mOhms */ if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) @@ -234,6 +236,9 @@ static int ina2xx_probe(struct i2c_client *client, pdata = (struct ina2xx_platform_data *)client->dev.platform_data; shunt = pdata->shunt_uohms; + } else if (!of_property_read_u32(client->dev.of_node, + "shunt-resistor", &val)) { + shunt = val; } if (shunt <= 0) -- cgit v1.2.3-70-g09d2 From 594fbe713bf60073ed884dc317a74dd5b327aba7 Mon Sep 17 00:00:00 2001 From: Arnaud Ebalard Date: Thu, 20 Jun 2013 22:21:04 +0200 Subject: Add support for GMT G762/G763 PWM fan controllers GMT G762/763 fan speed PWM controller is connected directly to a fan and performs closed-loop or open-loop control of the fan speed. Two modes - PWM or DC - are supported by the chip. Introduced driver provides various knobs to control the operations of the chip (via sysfs interface). Specific characteristics of the system can be passed either using board init code or via DT. Documentation for both the driver and DT bindings are also provided. Signed-off-by: Arnaud Ebalard Tested-by: Simon Guinot Signed-off-by: Guenter Roeck --- Documentation/devicetree/bindings/hwmon/g762.txt | 47 + Documentation/hwmon/g762 | 65 ++ drivers/hwmon/Kconfig | 10 + drivers/hwmon/Makefile | 1 + drivers/hwmon/g762.c | 1149 ++++++++++++++++++++++ include/linux/platform_data/g762.h | 37 + 6 files changed, 1309 insertions(+) create mode 100644 Documentation/devicetree/bindings/hwmon/g762.txt create mode 100644 Documentation/hwmon/g762 create mode 100644 drivers/hwmon/g762.c create mode 100644 include/linux/platform_data/g762.h (limited to 'drivers/hwmon') diff --git a/Documentation/devicetree/bindings/hwmon/g762.txt b/Documentation/devicetree/bindings/hwmon/g762.txt new file mode 100644 index 00000000000..25cc6d8ee57 --- /dev/null +++ b/Documentation/devicetree/bindings/hwmon/g762.txt @@ -0,0 +1,47 @@ +GMT G762/G763 PWM Fan controller + +Required node properties: + + - "compatible": must be either "gmt,g762" or "gmt,g763" + - "reg": I2C bus address of the device + - "clocks": a fixed clock providing input clock frequency + on CLK pin of the chip. + +Optional properties: + + - "fan_startv": fan startup voltage. Accepted values are 0, 1, 2 and 3. + The higher the more. + + - "pwm_polarity": pwm polarity. Accepted values are 0 (positive duty) + and 1 (negative duty). + + - "fan_gear_mode": fan gear mode. Supported values are 0, 1 and 2. + +If an optional property is not set in .dts file, then current value is kept +unmodified (e.g. u-boot installed value). + +Additional information on operational parameters for the device is available +in Documentation/hwmon/g762. A detailed datasheet for the device is available +at http://natisbad.org/NAS/refs/GMT_EDS-762_763-080710-0.2.pdf. + +Example g762 node: + + clocks { + #address-cells = <1>; + #size-cells = <0>; + + g762_clk: fixedclk { + compatible = "fixed-clock"; + #clock-cells = <0>; + clock-frequency = <8192>; + } + } + + g762: g762@3e { + compatible = "gmt,g762"; + reg = <0x3e>; + clocks = <&g762_clk> + fan_gear_mode = <0>; /* chip default */ + fan_startv = <1>; /* chip default */ + pwm_polarity = <0>; /* chip default */ + }; diff --git a/Documentation/hwmon/g762 b/Documentation/hwmon/g762 new file mode 100644 index 00000000000..923db9c5b5b --- /dev/null +++ b/Documentation/hwmon/g762 @@ -0,0 +1,65 @@ +Kernel driver g762 +================== + +The GMT G762 Fan Speed PWM Controller is connected directly to a fan +and performs closed-loop or open-loop control of the fan speed. Two +modes - PWM or DC - are supported by the device. + +For additional information, a detailed datasheet is available at +http://natisbad.org/NAS/ref/GMT_EDS-762_763-080710-0.2.pdf. sysfs +bindings are described in Documentation/hwmon/sysfs-interface. + +The following entries are available to the user in a subdirectory of +/sys/bus/i2c/drivers/g762/ to control the operation of the device. +This can be done manually using the following entries but is usually +done via a userland daemon like fancontrol. + +Note that those entries do not provide ways to setup the specific +hardware characteristics of the system (reference clock, pulses per +fan revolution, ...); Those can be modified via devicetree bindings +documented in Documentation/devicetree/bindings/hwmon/g762.txt or +using a specific platform_data structure in board initialization +file (see include/linux/platform_data/g762.h). + + fan1_target: set desired fan speed. This only makes sense in closed-loop + fan speed control (i.e. when pwm1_enable is set to 2). + + fan1_input: provide current fan rotation value in RPM as reported by + the fan to the device. + + fan1_div: fan clock divisor. Supported value are 1, 2, 4 and 8. + + fan1_pulses: number of pulses per fan revolution. Supported values + are 2 and 4. + + fan1_fault: reports fan failure, i.e. no transition on fan gear pin for + about 0.7s (if the fan is not voluntarily set off). + + fan1_alarm: in closed-loop control mode, if fan RPM value is 25% out + of the programmed value for over 6 seconds 'fan1_alarm' is + set to 1. + + pwm1_enable: set current fan speed control mode i.e. 1 for manual fan + speed control (open-loop) via pwm1 described below, 2 for + automatic fan speed control (closed-loop) via fan1_target + above. + + pwm1_mode: set or get fan driving mode: 1 for PWM mode, 0 for DC mode. + + pwm1: get or set PWM fan control value in open-loop mode. This is an + integer value between 0 and 255. 0 stops the fan, 255 makes + it run at full speed. + +Both in PWM mode ('pwm1_mode' set to 1) and DC mode ('pwm1_mode' set to 0), +when current fan speed control mode is open-loop ('pwm1_enable' set to 1), +the fan speed is programmed by setting a value between 0 and 255 via 'pwm1' +entry (0 stops the fan, 255 makes it run at full speed). In closed-loop mode +('pwm1_enable' set to 2), the expected rotation speed in RPM can be passed to +the chip via 'fan1_target'. In closed-loop mode, the target speed is compared +with current speed (available via 'fan1_input') by the device and a feedback +is performed to match that target value. The fan speed value is computed +based on the parameters associated with the physical characteristics of the +system: a reference clock source frequency, a number of pulses per fan +revolution, etc. + +Note that the driver will update its values at most once per second. diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index 683c769a8fc..e989f7fd645 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig @@ -461,6 +461,16 @@ config SENSORS_G760A This driver can also be built as a module. If so, the module will be called g760a. +config SENSORS_G762 + tristate "GMT G762 and G763" + depends on I2C + help + If you say yes here you get support for Global Mixed-mode + Technology Inc G762 and G763 fan speed PWM controller chips. + + This driver can also be built as a module. If so, the module + will be called g762. + config SENSORS_GL518SM tristate "Genesys Logic GL518SM" depends on I2C diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile index d17d3e64f9f..4f0fb5235f4 100644 --- a/drivers/hwmon/Makefile +++ b/drivers/hwmon/Makefile @@ -60,6 +60,7 @@ obj-$(CONFIG_SENSORS_F75375S) += f75375s.o obj-$(CONFIG_SENSORS_FAM15H_POWER) += fam15h_power.o obj-$(CONFIG_SENSORS_FSCHMD) += fschmd.o obj-$(CONFIG_SENSORS_G760A) += g760a.o +obj-$(CONFIG_SENSORS_G762) += g762.o obj-$(CONFIG_SENSORS_GL518SM) += gl518sm.o obj-$(CONFIG_SENSORS_GL520SM) += gl520sm.o obj-$(CONFIG_SENSORS_GPIO_FAN) += gpio-fan.o diff --git a/drivers/hwmon/g762.c b/drivers/hwmon/g762.c new file mode 100644 index 00000000000..73adf01b0ef --- /dev/null +++ b/drivers/hwmon/g762.c @@ -0,0 +1,1149 @@ +/* + * g762 - Driver for the Global Mixed-mode Technology Inc. fan speed + * PWM controller chips from G762 family, i.e. G762 and G763 + * + * Copyright (C) 2013, Arnaud EBALARD + * + * This work is based on a basic version for 2.6.31 kernel developed + * by Olivier Mouchet for LaCie. Updates and correction have been + * performed to run on recent kernels. Additional features, like the + * ability to configure various characteristics via .dts file or + * board init file have been added. Detailed datasheet on which this + * development is based is available here: + * + * http://natisbad.org/NAS/refs/GMT_EDS-762_763-080710-0.2.pdf + * + * Headers from previous developments have been kept below: + * + * Copyright (c) 2009 LaCie + * + * Author: Olivier Mouchet + * + * based on g760a code written by Herbert Valerio Riedel + * Copyright (C) 2007 Herbert Valerio Riedel + * + * g762: minimal datasheet available at: + * http://www.gmt.com.tw/product/datasheet/EDS-762_3.pdf + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define DRVNAME "g762" + +static const struct i2c_device_id g762_id[] = { + { "g762", 0 }, + { "g763", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, g762_id); + +enum g762_regs { + G762_REG_SET_CNT = 0x00, + G762_REG_ACT_CNT = 0x01, + G762_REG_FAN_STA = 0x02, + G762_REG_SET_OUT = 0x03, + G762_REG_FAN_CMD1 = 0x04, + G762_REG_FAN_CMD2 = 0x05, +}; + +/* Config register bits */ +#define G762_REG_FAN_CMD1_DET_FAN_FAIL 0x80 /* enable fan_fail signal */ +#define G762_REG_FAN_CMD1_DET_FAN_OOC 0x40 /* enable fan_out_of_control */ +#define G762_REG_FAN_CMD1_OUT_MODE 0x20 /* out mode: PWM or DC */ +#define G762_REG_FAN_CMD1_FAN_MODE 0x10 /* fan mode: closed/open-loop */ +#define G762_REG_FAN_CMD1_CLK_DIV_ID1 0x08 /* clock divisor value */ +#define G762_REG_FAN_CMD1_CLK_DIV_ID0 0x04 +#define G762_REG_FAN_CMD1_PWM_POLARITY 0x02 /* PWM polarity */ +#define G762_REG_FAN_CMD1_PULSE_PER_REV 0x01 /* pulse per fan revolution */ + +#define G762_REG_FAN_CMD2_GEAR_MODE_1 0x08 /* fan gear mode */ +#define G762_REG_FAN_CMD2_GEAR_MODE_0 0x04 +#define G762_REG_FAN_CMD2_FAN_STARTV_1 0x02 /* fan startup voltage */ +#define G762_REG_FAN_CMD2_FAN_STARTV_0 0x01 + +#define G762_REG_FAN_STA_FAIL 0x02 /* fan fail */ +#define G762_REG_FAN_STA_OOC 0x01 /* fan out of control */ + +/* Config register values */ +#define G762_OUT_MODE_PWM 1 +#define G762_OUT_MODE_DC 0 + +#define G762_FAN_MODE_CLOSED_LOOP 2 +#define G762_FAN_MODE_OPEN_LOOP 1 + +#define G762_PWM_POLARITY_NEGATIVE 1 +#define G762_PWM_POLARITY_POSITIVE 0 + +/* Register data is read (and cached) at most once per second. */ +#define G762_UPDATE_INTERVAL HZ + +/* + * Extract pulse count per fan revolution value (2 or 4) from given + * FAN_CMD1 register value. + */ +#define G762_PULSE_FROM_REG(reg) \ + ((((reg) & G762_REG_FAN_CMD1_PULSE_PER_REV) + 1) << 1) + +/* + * Extract fan clock divisor (1, 2, 4 or 8) from given FAN_CMD1 + * register value. + */ +#define G762_CLKDIV_FROM_REG(reg) \ + (1 << (((reg) & (G762_REG_FAN_CMD1_CLK_DIV_ID0 | \ + G762_REG_FAN_CMD1_CLK_DIV_ID1)) >> 2)) + +/* + * Extract fan gear mode multiplier value (0, 2 or 4) from given + * FAN_CMD2 register value. + */ +#define G762_GEARMULT_FROM_REG(reg) \ + (1 << (((reg) & (G762_REG_FAN_CMD2_GEAR_MODE_0 | \ + G762_REG_FAN_CMD2_GEAR_MODE_1)) >> 2)) + +struct g762_data { + struct i2c_client *client; + struct device *hwmon_dev; + struct clk *clk; + + /* update mutex */ + struct mutex update_lock; + + /* board specific parameters. */ + u32 clk_freq; + + /* g762 register cache */ + bool valid; + unsigned long last_updated; /* in jiffies */ + + u8 set_cnt; /* controls fan rotation speed in closed-loop mode */ + u8 act_cnt; /* provides access to current fan RPM value */ + u8 fan_sta; /* bit 0: set when actual fan speed is more than + * 25% outside requested fan speed + * bit 1: set when no transition occurs on fan + * pin for 0.7s + */ + u8 set_out; /* controls fan rotation speed in open-loop mode */ + u8 fan_cmd1; /* 0: FG_PLS_ID0 FG pulses count per revolution + * 0: 2 counts per revolution + * 1: 4 counts per revolution + * 1: PWM_POLARITY 1: negative_duty + * 0: positive_duty + * 2,3: [FG_CLOCK_ID0, FG_CLK_ID1] + * 00: Divide fan clock by 1 + * 01: Divide fan clock by 2 + * 10: Divide fan clock by 4 + * 11: Divide fan clock by 8 + * 4: FAN_MODE 1:closed-loop, 0:open-loop + * 5: OUT_MODE 1:PWM, 0:DC + * 6: DET_FAN_OOC enable "fan ooc" status + * 7: DET_FAN_FAIL enable "fan fail" status + */ + u8 fan_cmd2; /* 0,1: FAN_STARTV 0,1,2,3 -> 0,32,64,96 dac_code + * 2,3: FG_GEAR_MODE + * 00: multiplier = 1 + * 01: multiplier = 2 + * 10: multiplier = 4 + * 4: Mask ALERT# (g763 only) + */ +}; + +/* + * Convert count value from fan controller register (FAN_SET_CNT) into fan + * speed RPM value. Note that the datasheet documents a basic formula; + * influence of additional parameters (fan clock divisor, fan gear mode) + * have been infered from examples in the datasheet and tests. + */ +static inline unsigned int rpm_from_cnt(u8 cnt, u32 clk_freq, u16 p, + u8 clk_div, u8 gear_mult) +{ + if (cnt == 0xff) /* setting cnt to 255 stops the fan */ + return 0; + + return (clk_freq * 30 * gear_mult) / ((cnt ? cnt : 1) * p * clk_div); +} + +/* + * Convert fan RPM value from sysfs into count value for fan controller + * register (FAN_SET_CNT). + */ +static inline unsigned char cnt_from_rpm(u32 rpm, u32 clk_freq, u16 p, + u8 clk_div, u8 gear_mult) +{ + if (!rpm) /* to stop the fan, set cnt to 255 */ + return 0xff; + + return clamp_val(((clk_freq * 30 * gear_mult) / (rpm * p * clk_div)), + 0, 255); +} + +/* helper to grab and cache data, at most one time per second */ +static struct g762_data *g762_update_client(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct g762_data *data = i2c_get_clientdata(client); + int ret = 0; + + mutex_lock(&data->update_lock); + if (time_before(jiffies, data->last_updated + G762_UPDATE_INTERVAL) && + likely(data->valid)) + goto out; + + ret = i2c_smbus_read_byte_data(client, G762_REG_SET_CNT); + if (ret < 0) + goto out; + data->set_cnt = ret; + + ret = i2c_smbus_read_byte_data(client, G762_REG_ACT_CNT); + if (ret < 0) + goto out; + data->act_cnt = ret; + + ret = i2c_smbus_read_byte_data(client, G762_REG_FAN_STA); + if (ret < 0) + goto out; + data->fan_sta = ret; + + ret = i2c_smbus_read_byte_data(client, G762_REG_SET_OUT); + if (ret < 0) + goto out; + data->set_out = ret; + + ret = i2c_smbus_read_byte_data(client, G762_REG_FAN_CMD1); + if (ret < 0) + goto out; + data->fan_cmd1 = ret; + + ret = i2c_smbus_read_byte_data(client, G762_REG_FAN_CMD2); + if (ret < 0) + goto out; + data->fan_cmd2 = ret; + + data->last_updated = jiffies; + data->valid = true; + out: + mutex_unlock(&data->update_lock); + + if (ret < 0) /* upon error, encode it in return value */ + data = ERR_PTR(ret); + + return data; +} + +/* helpers for writing hardware parameters */ + +/* + * Set input clock frequency received on CLK pin of the chip. Accepted values + * are between 0 and 0xffffff. If zero is given, then default frequency + * (32,768Hz) is used. Note that clock frequency is a characteristic of the + * system but an internal parameter, i.e. value is not passed to the device. + */ +static int do_set_clk_freq(struct device *dev, unsigned long val) +{ + struct i2c_client *client = to_i2c_client(dev); + struct g762_data *data = i2c_get_clientdata(client); + + if (val > 0xffffff) + return -EINVAL; + if (!val) + val = 32768; + + data->clk_freq = val; + + return 0; +} + +/* Set pwm mode. Accepts either 0 (PWM mode) or 1 (DC mode) */ +static int do_set_pwm_mode(struct device *dev, unsigned long val) +{ + struct i2c_client *client = to_i2c_client(dev); + struct g762_data *data = g762_update_client(dev); + int ret; + + if (IS_ERR(data)) + return PTR_ERR(data); + + mutex_lock(&data->update_lock); + switch (val) { + case G762_OUT_MODE_PWM: + data->fan_cmd1 |= G762_REG_FAN_CMD1_OUT_MODE; + break; + case G762_OUT_MODE_DC: + data->fan_cmd1 &= ~G762_REG_FAN_CMD1_OUT_MODE; + break; + default: + ret = -EINVAL; + goto out; + } + ret = i2c_smbus_write_byte_data(client, G762_REG_FAN_CMD1, + data->fan_cmd1); + data->valid = false; + out: + mutex_unlock(&data->update_lock); + + return ret; +} + +/* Set fan clock divisor. Accepts either 1, 2, 4 or 8. */ +static int do_set_fan_div(struct device *dev, unsigned long val) +{ + struct i2c_client *client = to_i2c_client(dev); + struct g762_data *data = g762_update_client(dev); + int ret; + + if (IS_ERR(data)) + return PTR_ERR(data); + + mutex_lock(&data->update_lock); + switch (val) { + case 1: + data->fan_cmd1 &= ~G762_REG_FAN_CMD1_CLK_DIV_ID0; + data->fan_cmd1 &= ~G762_REG_FAN_CMD1_CLK_DIV_ID1; + break; + case 2: + data->fan_cmd1 |= G762_REG_FAN_CMD1_CLK_DIV_ID0; + data->fan_cmd1 &= ~G762_REG_FAN_CMD1_CLK_DIV_ID1; + break; + case 4: + data->fan_cmd1 &= ~G762_REG_FAN_CMD1_CLK_DIV_ID0; + data->fan_cmd1 |= G762_REG_FAN_CMD1_CLK_DIV_ID1; + break; + case 8: + data->fan_cmd1 |= G762_REG_FAN_CMD1_CLK_DIV_ID0; + data->fan_cmd1 |= G762_REG_FAN_CMD1_CLK_DIV_ID1; + break; + default: + ret = -EINVAL; + goto out; + } + ret = i2c_smbus_write_byte_data(client, G762_REG_FAN_CMD1, + data->fan_cmd1); + data->valid = false; + out: + mutex_unlock(&data->update_lock); + + return ret; +} + +/* Set fan gear mode. Accepts either 0, 1 or 2. */ +static int do_set_fan_gear_mode(struct device *dev, unsigned long val) +{ + struct i2c_client *client = to_i2c_client(dev); + struct g762_data *data = g762_update_client(dev); + int ret; + + if (IS_ERR(data)) + return PTR_ERR(data); + + mutex_lock(&data->update_lock); + switch (val) { + case 0: + data->fan_cmd2 &= ~G762_REG_FAN_CMD2_GEAR_MODE_0; + data->fan_cmd2 &= ~G762_REG_FAN_CMD2_GEAR_MODE_1; + break; + case 1: + data->fan_cmd2 |= G762_REG_FAN_CMD2_GEAR_MODE_0; + data->fan_cmd2 &= ~G762_REG_FAN_CMD2_GEAR_MODE_1; + break; + case 2: + data->fan_cmd2 &= ~G762_REG_FAN_CMD2_GEAR_MODE_0; + data->fan_cmd2 |= G762_REG_FAN_CMD2_GEAR_MODE_1; + break; + default: + ret = -EINVAL; + goto out; + } + ret = i2c_smbus_write_byte_data(client, G762_REG_FAN_CMD2, + data->fan_cmd2); + data->valid = false; + out: + mutex_unlock(&data->update_lock); + + return ret; +} + +/* Set number of fan pulses per revolution. Accepts either 2 or 4. */ +static int do_set_fan_pulses(struct device *dev, unsigned long val) +{ + struct i2c_client *client = to_i2c_client(dev); + struct g762_data *data = g762_update_client(dev); + int ret; + + if (IS_ERR(data)) + return PTR_ERR(data); + + mutex_lock(&data->update_lock); + switch (val) { + case 2: + data->fan_cmd1 &= ~G762_REG_FAN_CMD1_PULSE_PER_REV; + break; + case 4: + data->fan_cmd1 |= G762_REG_FAN_CMD1_PULSE_PER_REV; + break; + default: + ret = -EINVAL; + goto out; + } + ret = i2c_smbus_write_byte_data(client, G762_REG_FAN_CMD1, + data->fan_cmd1); + data->valid = false; + out: + mutex_unlock(&data->update_lock); + + return ret; +} + +/* Set fan mode. Accepts either 1 (open-loop) or 2 (closed-loop). */ +static int do_set_pwm_enable(struct device *dev, unsigned long val) +{ + struct i2c_client *client = to_i2c_client(dev); + struct g762_data *data = g762_update_client(dev); + int ret; + + if (IS_ERR(data)) + return PTR_ERR(data); + + mutex_lock(&data->update_lock); + switch (val) { + case G762_FAN_MODE_CLOSED_LOOP: + data->fan_cmd1 |= G762_REG_FAN_CMD1_FAN_MODE; + break; + case G762_FAN_MODE_OPEN_LOOP: + data->fan_cmd1 &= ~G762_REG_FAN_CMD1_FAN_MODE; + /* + * BUG FIX: if SET_CNT register value is 255 then, for some + * unknown reason, fan will not rotate as expected, no matter + * the value of SET_OUT (to be specific, this seems to happen + * only in PWM mode). To workaround this bug, we give SET_CNT + * value of 254 if it is 255 when switching to open-loop. + */ + if (data->set_cnt == 0xff) + i2c_smbus_write_byte_data(client, G762_REG_SET_CNT, + 254); + break; + default: + ret = -EINVAL; + goto out; + } + + ret = i2c_smbus_write_byte_data(client, G762_REG_FAN_CMD1, + data->fan_cmd1); + data->valid = false; + out: + mutex_unlock(&data->update_lock); + + return ret; +} + +/* Set PWM polarity. Accepts either 0 (positive duty) or 1 (negative duty) */ +static int do_set_pwm_polarity(struct device *dev, unsigned long val) +{ + struct i2c_client *client = to_i2c_client(dev); + struct g762_data *data = g762_update_client(dev); + int ret; + + if (IS_ERR(data)) + return PTR_ERR(data); + + mutex_lock(&data->update_lock); + switch (val) { + case G762_PWM_POLARITY_POSITIVE: + data->fan_cmd1 &= ~G762_REG_FAN_CMD1_PWM_POLARITY; + break; + case G762_PWM_POLARITY_NEGATIVE: + data->fan_cmd1 |= G762_REG_FAN_CMD1_PWM_POLARITY; + break; + default: + ret = -EINVAL; + goto out; + } + ret = i2c_smbus_write_byte_data(client, G762_REG_FAN_CMD1, + data->fan_cmd1); + data->valid = false; + out: + mutex_unlock(&data->update_lock); + + return ret; +} + +/* + * Set pwm value. Accepts values between 0 (stops the fan) and + * 255 (full speed). This only makes sense in open-loop mode. + */ +static int do_set_pwm(struct device *dev, unsigned long val) +{ + struct i2c_client *client = to_i2c_client(dev); + struct g762_data *data = i2c_get_clientdata(client); + int ret; + + if (val > 255) + return -EINVAL; + + mutex_lock(&data->update_lock); + ret = i2c_smbus_write_byte_data(client, G762_REG_SET_OUT, val); + data->valid = false; + mutex_unlock(&data->update_lock); + + return ret; +} + +/* + * Set fan RPM value. Can be called both in closed and open-loop mode + * but effect will only be seen after closed-loop mode is configured. + */ +static int do_set_fan_target(struct device *dev, unsigned long val) +{ + struct i2c_client *client = to_i2c_client(dev); + struct g762_data *data = g762_update_client(dev); + int ret; + + if (IS_ERR(data)) + return PTR_ERR(data); + + mutex_lock(&data->update_lock); + data->set_cnt = cnt_from_rpm(val, data->clk_freq, + G762_PULSE_FROM_REG(data->fan_cmd1), + G762_CLKDIV_FROM_REG(data->fan_cmd1), + G762_GEARMULT_FROM_REG(data->fan_cmd2)); + ret = i2c_smbus_write_byte_data(client, G762_REG_SET_CNT, + data->set_cnt); + data->valid = false; + mutex_unlock(&data->update_lock); + + return ret; +} + +/* Set fan startup voltage. Accepted values are either 0, 1, 2 or 3. */ +static int do_set_fan_startv(struct device *dev, unsigned long val) +{ + struct i2c_client *client = to_i2c_client(dev); + struct g762_data *data = g762_update_client(dev); + int ret; + + if (IS_ERR(data)) + return PTR_ERR(data); + + mutex_lock(&data->update_lock); + switch (val) { + case 0: + data->fan_cmd2 &= ~G762_REG_FAN_CMD2_FAN_STARTV_0; + data->fan_cmd2 &= ~G762_REG_FAN_CMD2_FAN_STARTV_1; + break; + case 1: + data->fan_cmd2 |= G762_REG_FAN_CMD2_FAN_STARTV_0; + data->fan_cmd2 &= ~G762_REG_FAN_CMD2_FAN_STARTV_1; + break; + case 2: + data->fan_cmd2 &= ~G762_REG_FAN_CMD2_FAN_STARTV_0; + data->fan_cmd2 |= G762_REG_FAN_CMD2_FAN_STARTV_1; + break; + case 3: + data->fan_cmd2 |= G762_REG_FAN_CMD2_FAN_STARTV_0; + data->fan_cmd2 |= G762_REG_FAN_CMD2_FAN_STARTV_1; + break; + default: + ret = -EINVAL; + goto out; + } + ret = i2c_smbus_write_byte_data(client, G762_REG_FAN_CMD2, + data->fan_cmd2); + data->valid = false; + out: + mutex_unlock(&data->update_lock); + + return ret; +} + +/* + * Helper to import hardware characteristics from .dts file and push + * those to the chip. + */ + +#ifdef CONFIG_OF +static struct of_device_id g762_dt_match[] = { + { .compatible = "gmt,g762" }, + { .compatible = "gmt,g763" }, + { }, +}; + +/* + * Grab clock (a required property), enable it, get (fixed) clock frequency + * and store it. Note: upon success, clock has been prepared and enabled; it + * must later be unprepared and disabled (e.g. during module unloading) by a + * call to g762_of_clock_disable(). Note that a reference to clock is kept + * in our private data structure to be used in this function. + */ +static int g762_of_clock_enable(struct i2c_client *client) +{ + struct g762_data *data; + unsigned long clk_freq; + struct clk *clk; + int ret; + + if (!client->dev.of_node) + return 0; + + clk = of_clk_get(client->dev.of_node, 0); + if (IS_ERR(clk)) { + dev_err(&client->dev, "failed to get clock\n"); + return PTR_ERR(clk); + } + + ret = clk_prepare_enable(clk); + if (ret) { + dev_err(&client->dev, "failed to enable clock\n"); + goto clk_put; + } + + clk_freq = clk_get_rate(clk); + ret = do_set_clk_freq(&client->dev, clk_freq); + if (ret) { + dev_err(&client->dev, "invalid clock freq %lu\n", clk_freq); + goto clk_unprep; + } + + data = i2c_get_clientdata(client); + data->clk = clk; + + return 0; + + clk_unprep: + clk_disable_unprepare(clk); + + clk_put: + clk_put(clk); + + return ret; +} + +static void g762_of_clock_disable(struct i2c_client *client) +{ + struct g762_data *data = i2c_get_clientdata(client); + + if (!data->clk) + return; + + clk_disable_unprepare(data->clk); + clk_put(data->clk); +} + +static int g762_of_prop_import_one(struct i2c_client *client, + const char *pname, + int (*psetter)(struct device *dev, + unsigned long val)) +{ + const __be32 *prop; + int len, ret; + u32 pval; + + prop = of_get_property(client->dev.of_node, pname, &len); + if (!prop || len != sizeof(u32)) + return 0; + + pval = be32_to_cpu(prop[0]); + dev_dbg(&client->dev, "found %s (%d)\n", pname, pval); + ret = (*psetter)(&client->dev, pval); + if (ret) + dev_err(&client->dev, "unable to set %s (%d)\n", pname, pval); + + return ret; +} + +static int g762_of_prop_import(struct i2c_client *client) +{ + int ret; + + if (!client->dev.of_node) + return 0; + + ret = g762_of_prop_import_one(client, "fan_gear_mode", + do_set_fan_gear_mode); + if (ret) + return ret; + + ret = g762_of_prop_import_one(client, "pwm_polarity", + do_set_pwm_polarity); + if (ret) + return ret; + + return g762_of_prop_import_one(client, "fan_startv", + do_set_fan_startv); +} + +#else +static int g762_of_prop_import(struct i2c_client *client) +{ + return 0; +} + +static int g762_of_clock_enable(struct i2c_client *client) +{ + return 0; +} + +static void g762_of_clock_disable(struct i2c_client *client) { } +#endif + +/* + * Helper to import hardware characteristics from .dts file and push + * those to the chip. + */ + +static int g762_pdata_prop_import(struct i2c_client *client) +{ + struct g762_platform_data *pdata = client->dev.platform_data; + int ret; + + if (!pdata) + return 0; + + ret = do_set_fan_gear_mode(&client->dev, pdata->fan_gear_mode); + if (ret) + return ret; + + ret = do_set_pwm_polarity(&client->dev, pdata->pwm_polarity); + if (ret) + return ret; + + ret = do_set_fan_startv(&client->dev, pdata->fan_startv); + if (ret) + return ret; + + return do_set_clk_freq(&client->dev, pdata->clk_freq); +} + +/* + * sysfs attributes + */ + +/* + * Read function for fan1_input sysfs file. Return current fan RPM value, or + * 0 if fan is out of control. + */ +static ssize_t get_fan_rpm(struct device *dev, struct device_attribute *da, + char *buf) +{ + struct g762_data *data = g762_update_client(dev); + unsigned int rpm = 0; + + if (IS_ERR(data)) + return PTR_ERR(data); + + mutex_lock(&data->update_lock); + /* reverse logic: fan out of control reporting is enabled low */ + if (data->fan_sta & G762_REG_FAN_STA_OOC) { + rpm = rpm_from_cnt(data->act_cnt, data->clk_freq, + G762_PULSE_FROM_REG(data->fan_cmd1), + G762_CLKDIV_FROM_REG(data->fan_cmd1), + G762_GEARMULT_FROM_REG(data->fan_cmd2)); + } + mutex_unlock(&data->update_lock); + + return sprintf(buf, "%u\n", rpm); +} + +/* + * Read and write functions for pwm1_mode sysfs file. Get and set fan speed + * control mode i.e. PWM (1) or DC (0). + */ +static ssize_t get_pwm_mode(struct device *dev, struct device_attribute *da, + char *buf) +{ + struct g762_data *data = g762_update_client(dev); + + if (IS_ERR(data)) + return PTR_ERR(data); + + return sprintf(buf, "%d\n", + !!(data->fan_cmd1 & G762_REG_FAN_CMD1_OUT_MODE)); +} + +static ssize_t set_pwm_mode(struct device *dev, struct device_attribute *da, + const char *buf, size_t count) +{ + unsigned long val; + int ret; + + if (kstrtoul(buf, 10, &val)) + return -EINVAL; + + ret = do_set_pwm_mode(dev, val); + if (ret < 0) + return ret; + + return count; +} + +/* + * Read and write functions for fan1_div sysfs file. Get and set fan + * controller prescaler value + */ +static ssize_t get_fan_div(struct device *dev, + struct device_attribute *da, char *buf) +{ + struct g762_data *data = g762_update_client(dev); + + if (IS_ERR(data)) + return PTR_ERR(data); + + return sprintf(buf, "%d\n", G762_CLKDIV_FROM_REG(data->fan_cmd1)); +} + +static ssize_t set_fan_div(struct device *dev, + struct device_attribute *da, + const char *buf, size_t count) +{ + unsigned long val; + int ret; + + if (kstrtoul(buf, 10, &val)) + return -EINVAL; + + ret = do_set_fan_div(dev, val); + if (ret < 0) + return ret; + + return count; +} + +/* + * Read and write functions for fan1_pulses sysfs file. Get and set number + * of tachometer pulses per fan revolution. + */ +static ssize_t get_fan_pulses(struct device *dev, + struct device_attribute *da, char *buf) +{ + struct g762_data *data = g762_update_client(dev); + + if (IS_ERR(data)) + return PTR_ERR(data); + + return sprintf(buf, "%d\n", G762_PULSE_FROM_REG(data->fan_cmd1)); +} + +static ssize_t set_fan_pulses(struct device *dev, + struct device_attribute *da, + const char *buf, size_t count) +{ + unsigned long val; + int ret; + + if (kstrtoul(buf, 10, &val)) + return -EINVAL; + + ret = do_set_fan_pulses(dev, val); + if (ret < 0) + return ret; + + return count; +} + +/* + * Read and write functions for pwm1_enable. Get and set fan speed control mode + * (i.e. closed or open-loop). + * + * Following documentation about hwmon's sysfs interface, a pwm1_enable node + * should accept followings: + * + * 0 : no fan speed control (i.e. fan at full speed) + * 1 : manual fan speed control enabled (use pwm[1-*]) (open-loop) + * 2+: automatic fan speed control enabled (use fan[1-*]_target) (closed-loop) + * + * but we do not accept 0 as this mode is not natively supported by the chip + * and it is not emulated by g762 driver. -EINVAL is returned in this case. + */ +static ssize_t get_pwm_enable(struct device *dev, + struct device_attribute *da, char *buf) +{ + struct g762_data *data = g762_update_client(dev); + + if (IS_ERR(data)) + return PTR_ERR(data); + + return sprintf(buf, "%d\n", + (!!(data->fan_cmd1 & G762_REG_FAN_CMD1_FAN_MODE)) + 1); +} + +static ssize_t set_pwm_enable(struct device *dev, + struct device_attribute *da, + const char *buf, size_t count) +{ + unsigned long val; + int ret; + + if (kstrtoul(buf, 10, &val)) + return -EINVAL; + + ret = do_set_pwm_enable(dev, val); + if (ret < 0) + return ret; + + return count; +} + +/* + * Read and write functions for pwm1 sysfs file. Get and set pwm value + * (which affects fan speed) in open-loop mode. 0 stops the fan and 255 + * makes it run at full speed. + */ +static ssize_t get_pwm(struct device *dev, struct device_attribute *da, + char *buf) +{ + struct g762_data *data = g762_update_client(dev); + + if (IS_ERR(data)) + return PTR_ERR(data); + + return sprintf(buf, "%d\n", data->set_out); +} + +static ssize_t set_pwm(struct device *dev, struct device_attribute *da, + const char *buf, size_t count) +{ + unsigned long val; + int ret; + + if (kstrtoul(buf, 10, &val)) + return -EINVAL; + + ret = do_set_pwm(dev, val); + if (ret < 0) + return ret; + + return count; +} + +/* + * Read and write function for fan1_target sysfs file. Get/set the fan speed in + * closed-loop mode. Speed is given as a RPM value; then the chip will regulate + * the fan speed using pulses from fan tachometer. + * + * Refer to rpm_from_cnt() implementation above to get info about count number + * calculation. + * + * Also note that due to rounding errors it is possible that you don't read + * back exactly the value you have set. + */ +static ssize_t get_fan_target(struct device *dev, struct device_attribute *da, + char *buf) +{ + struct g762_data *data = g762_update_client(dev); + unsigned int rpm; + + if (IS_ERR(data)) + return PTR_ERR(data); + + mutex_lock(&data->update_lock); + rpm = rpm_from_cnt(data->set_cnt, data->clk_freq, + G762_PULSE_FROM_REG(data->fan_cmd1), + G762_CLKDIV_FROM_REG(data->fan_cmd1), + G762_GEARMULT_FROM_REG(data->fan_cmd2)); + mutex_unlock(&data->update_lock); + + return sprintf(buf, "%u\n", rpm); +} + +static ssize_t set_fan_target(struct device *dev, struct device_attribute *da, + const char *buf, size_t count) +{ + unsigned long val; + int ret; + + if (kstrtoul(buf, 10, &val)) + return -EINVAL; + + ret = do_set_fan_target(dev, val); + if (ret < 0) + return ret; + + return count; +} + +/* read function for fan1_fault sysfs file. */ +static ssize_t get_fan_failure(struct device *dev, struct device_attribute *da, + char *buf) +{ + struct g762_data *data = g762_update_client(dev); + + if (IS_ERR(data)) + return PTR_ERR(data); + + return sprintf(buf, "%u\n", !!(data->fan_sta & G762_REG_FAN_STA_FAIL)); +} + +/* + * read function for fan1_alarm sysfs file. Note that OOC condition is + * enabled low + */ +static ssize_t get_fan_ooc(struct device *dev, struct device_attribute *da, + char *buf) +{ + struct g762_data *data = g762_update_client(dev); + + if (IS_ERR(data)) + return PTR_ERR(data); + + return sprintf(buf, "%u\n", !(data->fan_sta & G762_REG_FAN_STA_OOC)); +} + +static DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, get_pwm, set_pwm); +static DEVICE_ATTR(pwm1_mode, S_IWUSR | S_IRUGO, get_pwm_mode, set_pwm_mode); +static DEVICE_ATTR(pwm1_enable, S_IWUSR | S_IRUGO, + get_pwm_enable, set_pwm_enable); +static DEVICE_ATTR(fan1_input, S_IRUGO, get_fan_rpm, NULL); +static DEVICE_ATTR(fan1_alarm, S_IRUGO, get_fan_ooc, NULL); +static DEVICE_ATTR(fan1_fault, S_IRUGO, get_fan_failure, NULL); +static DEVICE_ATTR(fan1_target, S_IWUSR | S_IRUGO, + get_fan_target, set_fan_target); +static DEVICE_ATTR(fan1_div, S_IWUSR | S_IRUGO, get_fan_div, set_fan_div); +static DEVICE_ATTR(fan1_pulses, S_IWUSR | S_IRUGO, + get_fan_pulses, set_fan_pulses); + +/* Driver data */ +static struct attribute *g762_attributes[] = { + &dev_attr_fan1_input.attr, + &dev_attr_fan1_alarm.attr, + &dev_attr_fan1_fault.attr, + &dev_attr_fan1_target.attr, + &dev_attr_fan1_div.attr, + &dev_attr_fan1_pulses.attr, + &dev_attr_pwm1.attr, + &dev_attr_pwm1_mode.attr, + &dev_attr_pwm1_enable.attr, + NULL +}; + +static const struct attribute_group g762_group = { + .attrs = g762_attributes, +}; + +/* + * Enable both fan failure detection and fan out of control protection. The + * function does not protect change/access to data structure; it must thus + * only be called during initialization. + */ +static inline int g762_fan_init(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct g762_data *data = g762_update_client(dev); + + if (IS_ERR(data)) + return PTR_ERR(data); + + data->fan_cmd1 |= G762_REG_FAN_CMD1_DET_FAN_FAIL; + data->fan_cmd1 |= G762_REG_FAN_CMD1_DET_FAN_OOC; + data->valid = false; + + return i2c_smbus_write_byte_data(client, G762_REG_FAN_CMD1, + data->fan_cmd1); +} + +static int g762_probe(struct i2c_client *client, const struct i2c_device_id *id) +{ + struct g762_data *data; + int ret; + + if (!i2c_check_functionality(client->adapter, + I2C_FUNC_SMBUS_BYTE_DATA)) + return -ENODEV; + + data = devm_kzalloc(&client->dev, sizeof(struct g762_data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + i2c_set_clientdata(client, data); + data->client = client; + mutex_init(&data->update_lock); + + /* Enable fan failure detection and fan out of control protection */ + ret = g762_fan_init(&client->dev); + if (ret) + return ret; + + /* Get configuration via DT ... */ + ret = g762_of_clock_enable(client); + if (ret) + return ret; + ret = g762_of_prop_import(client); + if (ret) + goto clock_dis; + /* ... or platform_data */ + ret = g762_pdata_prop_import(client); + if (ret) + goto clock_dis; + + /* Register sysfs hooks */ + ret = sysfs_create_group(&client->dev.kobj, &g762_group); + if (ret) + goto clock_dis; + + data->hwmon_dev = hwmon_device_register(&client->dev); + if (IS_ERR(data->hwmon_dev)) { + ret = PTR_ERR(data->hwmon_dev); + goto sysfs_rem; + } + + return 0; + + sysfs_rem: + sysfs_remove_group(&client->dev.kobj, &g762_group); + + clock_dis: + g762_of_clock_disable(client); + + return ret; +} + +static int g762_remove(struct i2c_client *client) +{ + struct g762_data *data = i2c_get_clientdata(client); + + hwmon_device_unregister(data->hwmon_dev); + sysfs_remove_group(&client->dev.kobj, &g762_group); + g762_of_clock_disable(client); + + return 0; +} + +static struct i2c_driver g762_driver = { + .driver = { + .name = DRVNAME, + .owner = THIS_MODULE, + .of_match_table = of_match_ptr(g762_dt_match), + }, + .probe = g762_probe, + .remove = g762_remove, + .id_table = g762_id, +}; + +module_i2c_driver(g762_driver); + +MODULE_AUTHOR("Arnaud EBALARD "); +MODULE_DESCRIPTION("GMT G762/G763 driver"); +MODULE_LICENSE("GPL"); diff --git a/include/linux/platform_data/g762.h b/include/linux/platform_data/g762.h new file mode 100644 index 00000000000..d3c51283764 --- /dev/null +++ b/include/linux/platform_data/g762.h @@ -0,0 +1,37 @@ +/* + * Platform data structure for g762 fan controller driver + * + * Copyright (C) 2013, Arnaud EBALARD + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ +#ifndef __LINUX_PLATFORM_DATA_G762_H__ +#define __LINUX_PLATFORM_DATA_G762_H__ + +/* + * Following structure can be used to set g762 driver platform specific data + * during board init. Note that passing a sparse structure is possible but + * will result in non-specified attributes to be set to default value, hence + * overloading those installed during boot (e.g. by u-boot). + */ + +struct g762_platform_data { + u32 fan_startv; + u32 fan_gear_mode; + u32 pwm_polarity; + u32 clk_freq; +}; + +#endif /* __LINUX_PLATFORM_DATA_G762_H__ */ -- cgit v1.2.3-70-g09d2 From b1d2bff6a61140454b9d203519cc686a2e9ef32f Mon Sep 17 00:00:00 2001 From: Guenter Roeck Date: Sat, 22 Jun 2013 16:15:31 -0700 Subject: hwmon: (nct6775) Fix temperature alarm attributes Driver displays wrong alarms for temperature attributes. Turns out that temperature alarm bits are not fixed, but determined by temperature source mapping. To fix the problem, walk through the temperature sources to determine the correct alarm bit associated with a given attribute. Cc: stable@vger.kernel.org # 3.10+ Signed-off-by: Guenter Roeck --- drivers/hwmon/nct6775.c | 80 +++++++++++++++++++++++++++++++++++-------------- 1 file changed, 57 insertions(+), 23 deletions(-) (limited to 'drivers/hwmon') diff --git a/drivers/hwmon/nct6775.c b/drivers/hwmon/nct6775.c index 04638aee903..2405ab439e8 100644 --- a/drivers/hwmon/nct6775.c +++ b/drivers/hwmon/nct6775.c @@ -625,6 +625,7 @@ struct nct6775_data { u8 has_fan_min; /* some fans don't have min register */ bool has_fan_div; + u8 num_temp_alarms; /* 2 or 3 */ u8 temp_fixed_num; /* 3 or 6 */ u8 temp_type[NUM_TEMP_FIXED]; s8 temp_offset[NUM_TEMP_FIXED]; @@ -1193,6 +1194,42 @@ show_alarm(struct device *dev, struct device_attribute *attr, char *buf) (unsigned int)((data->alarms >> nr) & 0x01)); } +static int find_temp_source(struct nct6775_data *data, int index, int count) +{ + int source = data->temp_src[index]; + int nr; + + for (nr = 0; nr < count; nr++) { + int src; + + src = nct6775_read_value(data, + data->REG_TEMP_SOURCE[nr]) & 0x1f; + if (src == source) + return nr; + } + return -1; +} + +static ssize_t +show_temp_alarm(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr); + struct nct6775_data *data = nct6775_update_device(dev); + unsigned int alarm = 0; + int nr; + + /* + * For temperatures, there is no fixed mapping from registers to alarm + * bits. Alarm bits are determined by the temperature source mapping. + */ + nr = find_temp_source(data, sattr->index, data->num_temp_alarms); + if (nr >= 0) { + int bit = data->ALARM_BITS[nr + TEMP_ALARM_BASE]; + alarm = (data->alarms >> bit) & 0x01; + } + return sprintf(buf, "%u\n", alarm); +} + static SENSOR_DEVICE_ATTR_2(in0_input, S_IRUGO, show_in_reg, NULL, 0, 0); static SENSOR_DEVICE_ATTR_2(in1_input, S_IRUGO, show_in_reg, NULL, 1, 0); static SENSOR_DEVICE_ATTR_2(in2_input, S_IRUGO, show_in_reg, NULL, 2, 0); @@ -1874,22 +1911,18 @@ static struct sensor_device_attribute sda_temp_type[] = { }; static struct sensor_device_attribute sda_temp_alarm[] = { - SENSOR_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, - TEMP_ALARM_BASE), - SENSOR_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, - TEMP_ALARM_BASE + 1), - SENSOR_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, - TEMP_ALARM_BASE + 2), - SENSOR_ATTR(temp4_alarm, S_IRUGO, show_alarm, NULL, - TEMP_ALARM_BASE + 3), - SENSOR_ATTR(temp5_alarm, S_IRUGO, show_alarm, NULL, - TEMP_ALARM_BASE + 4), - SENSOR_ATTR(temp6_alarm, S_IRUGO, show_alarm, NULL, - TEMP_ALARM_BASE + 5), + SENSOR_ATTR(temp1_alarm, S_IRUGO, show_temp_alarm, NULL, 0), + SENSOR_ATTR(temp2_alarm, S_IRUGO, show_temp_alarm, NULL, 1), + SENSOR_ATTR(temp3_alarm, S_IRUGO, show_temp_alarm, NULL, 2), + SENSOR_ATTR(temp4_alarm, S_IRUGO, show_temp_alarm, NULL, 3), + SENSOR_ATTR(temp5_alarm, S_IRUGO, show_temp_alarm, NULL, 4), + SENSOR_ATTR(temp6_alarm, S_IRUGO, show_temp_alarm, NULL, 5), + SENSOR_ATTR(temp7_alarm, S_IRUGO, show_temp_alarm, NULL, 6), + SENSOR_ATTR(temp8_alarm, S_IRUGO, show_temp_alarm, NULL, 7), + SENSOR_ATTR(temp9_alarm, S_IRUGO, show_temp_alarm, NULL, 8), + SENSOR_ATTR(temp10_alarm, S_IRUGO, show_temp_alarm, NULL, 9), }; -#define NUM_TEMP_ALARM ARRAY_SIZE(sda_temp_alarm) - static ssize_t show_pwm_mode(struct device *dev, struct device_attribute *attr, char *buf) { @@ -3215,13 +3248,11 @@ static void nct6775_device_remove_files(struct device *dev) device_remove_file(dev, &sda_temp_max[i].dev_attr); device_remove_file(dev, &sda_temp_max_hyst[i].dev_attr); device_remove_file(dev, &sda_temp_crit[i].dev_attr); + device_remove_file(dev, &sda_temp_alarm[i].dev_attr); if (!(data->have_temp_fixed & (1 << i))) continue; device_remove_file(dev, &sda_temp_type[i].dev_attr); device_remove_file(dev, &sda_temp_offset[i].dev_attr); - if (i >= NUM_TEMP_ALARM) - continue; - device_remove_file(dev, &sda_temp_alarm[i].dev_attr); } device_remove_file(dev, &sda_caseopen[0].dev_attr); @@ -3419,6 +3450,7 @@ static int nct6775_probe(struct platform_device *pdev) data->auto_pwm_num = 6; data->has_fan_div = true; data->temp_fixed_num = 3; + data->num_temp_alarms = 3; data->ALARM_BITS = NCT6775_ALARM_BITS; @@ -3483,6 +3515,7 @@ static int nct6775_probe(struct platform_device *pdev) data->auto_pwm_num = 4; data->has_fan_div = false; data->temp_fixed_num = 3; + data->num_temp_alarms = 3; data->ALARM_BITS = NCT6776_ALARM_BITS; @@ -3547,6 +3580,7 @@ static int nct6775_probe(struct platform_device *pdev) data->auto_pwm_num = 4; data->has_fan_div = false; data->temp_fixed_num = 6; + data->num_temp_alarms = 2; data->ALARM_BITS = NCT6779_ALARM_BITS; @@ -3897,6 +3931,12 @@ static int nct6775_probe(struct platform_device *pdev) if (err) goto exit_remove; } + if (find_temp_source(data, i, data->num_temp_alarms) >= 0) { + err = device_create_file(dev, + &sda_temp_alarm[i].dev_attr); + if (err) + goto exit_remove; + } if (!(data->have_temp_fixed & (1 << i))) continue; err = device_create_file(dev, &sda_temp_type[i].dev_attr); @@ -3905,12 +3945,6 @@ static int nct6775_probe(struct platform_device *pdev) err = device_create_file(dev, &sda_temp_offset[i].dev_attr); if (err) goto exit_remove; - if (i >= NUM_TEMP_ALARM || - data->ALARM_BITS[TEMP_ALARM_BASE + i] < 0) - continue; - err = device_create_file(dev, &sda_temp_alarm[i].dev_attr); - if (err) - goto exit_remove; } for (i = 0; i < ARRAY_SIZE(sda_caseopen); i++) { -- cgit v1.2.3-70-g09d2 From 41fa9a944fce1d7efd5ee3d50ac85b92f42dcc3d Mon Sep 17 00:00:00 2001 From: Guenter Roeck Date: Sun, 23 Jun 2013 13:04:04 -0700 Subject: hwmon: (nct6775) Drop unsupported fan alarm attributes for NCT6775 NCT6775 does not support alarms for fans 4 and 5. Drop the attributes. cc: stable@vger.kernel.org # 3.10+ Signed-off-by: Guenter Roeck --- drivers/hwmon/nct6775.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) (limited to 'drivers/hwmon') diff --git a/drivers/hwmon/nct6775.c b/drivers/hwmon/nct6775.c index 2405ab439e8..99cec182542 100644 --- a/drivers/hwmon/nct6775.c +++ b/drivers/hwmon/nct6775.c @@ -199,7 +199,7 @@ static const s8 NCT6775_ALARM_BITS[] = { 0, 1, 2, 3, 8, 21, 20, 16, /* in0.. in7 */ 17, -1, -1, -1, -1, -1, -1, /* in8..in14 */ -1, /* unused */ - 6, 7, 11, 10, 23, /* fan1..fan5 */ + 6, 7, 11, -1, -1, /* fan1..fan5 */ -1, -1, -1, /* unused */ 4, 5, 13, -1, -1, -1, /* temp1..temp6 */ 12, -1 }; /* intrusion0, intrusion1 */ @@ -3877,10 +3877,12 @@ static int nct6775_probe(struct platform_device *pdev) &sda_fan_input[i].dev_attr); if (err) goto exit_remove; - err = device_create_file(dev, - &sda_fan_alarm[i].dev_attr); - if (err) - goto exit_remove; + if (data->ALARM_BITS[FAN_ALARM_BASE + i] >= 0) { + err = device_create_file(dev, + &sda_fan_alarm[i].dev_attr); + if (err) + goto exit_remove; + } if (data->kind != nct6776 && data->kind != nct6779) { err = device_create_file(dev, -- cgit v1.2.3-70-g09d2 From a50d9a4d9ad3c71341788099d733e4151b8a511b Mon Sep 17 00:00:00 2001 From: Guenter Roeck Date: Thu, 27 Jun 2013 10:07:19 -0700 Subject: hwmon: (ds1621) Fix temperature rounding operations Commit "hwmon: (ds1621) Add ds1721 chip support" broke rounding for chips or configurations with less than 12 bit resolution. Tested-by: Jean Delvare Acked-by: Jean Delvare Signed-off-by: Guenter Roeck --- drivers/hwmon/ds1621.c | 21 ++++++++++++--------- 1 file changed, 12 insertions(+), 9 deletions(-) (limited to 'drivers/hwmon') diff --git a/drivers/hwmon/ds1621.c b/drivers/hwmon/ds1621.c index 591758bb629..a26ba7a17c2 100644 --- a/drivers/hwmon/ds1621.c +++ b/drivers/hwmon/ds1621.c @@ -128,6 +128,8 @@ struct ds1621_data { u16 temp[3]; /* Register values, word */ u8 conf; /* Register encoding, combined */ + u8 zbits; /* Resolution encoded as number of + * zero bits */ u16 update_interval; /* Conversion rate in milliseconds */ }; @@ -139,16 +141,14 @@ static inline int DS1621_TEMP_FROM_REG(u16 reg) /* * TEMP: 0.001C/bit (-55C to +125C) * REG: - * - 1621, 1625: 0.5C/bit - * - 1631, 1721, 1731: 0.0625C/bit - * Assume highest resolution and let the bits fall where they may.. + * - 1621, 1625: 0.5C/bit, 7 zero-bits + * - 1631, 1721, 1731: 0.0625C/bit, 4 zero-bits */ -static inline u16 DS1621_TEMP_TO_REG(long temp) +static inline u16 DS1621_TEMP_TO_REG(long temp, u8 zbits) { - int ntemp = clamp_val(temp, DS1621_TEMP_MIN, DS1621_TEMP_MAX); - ntemp += (ntemp < 0 ? -31 : 31); - ntemp = DIV_ROUND_CLOSEST(ntemp * 10, 625) << 4; - return (u16)ntemp; + temp = clamp_val(temp, DS1621_TEMP_MIN, DS1621_TEMP_MAX); + temp = DIV_ROUND_CLOSEST(temp * (1 << (8 - zbits)), 1000) << zbits; + return temp; } static void ds1621_init_client(struct i2c_client *client) @@ -172,6 +172,7 @@ static void ds1621_init_client(struct i2c_client *client) switch (data->kind) { case ds1625: data->update_interval = DS1625_CONVERSION_MAX; + data->zbits = 7; sreg = DS1621_COM_START; break; case ds1631: @@ -180,10 +181,12 @@ static void ds1621_init_client(struct i2c_client *client) resol = (new_conf & DS1621_REG_CONFIG_RESOL) >> DS1621_REG_CONFIG_RESOL_SHIFT; data->update_interval = ds1721_convrates[resol]; + data->zbits = 7 - resol; sreg = DS1721_COM_START; break; default: data->update_interval = DS1621_CONVERSION_MAX; + data->zbits = 7; sreg = DS1621_COM_START; break; } @@ -254,7 +257,7 @@ static ssize_t set_temp(struct device *dev, struct device_attribute *da, return err; mutex_lock(&data->update_lock); - data->temp[attr->index] = DS1621_TEMP_TO_REG(val); + data->temp[attr->index] = DS1621_TEMP_TO_REG(val, data->zbits); i2c_smbus_write_word_swapped(client, DS1621_REG_TEMP[attr->index], data->temp[attr->index]); mutex_unlock(&data->update_lock); -- cgit v1.2.3-70-g09d2