diff options
Diffstat (limited to 'drivers/i2c/chips/lm90.c')
| -rw-r--r-- | drivers/i2c/chips/lm90.c | 626 |
1 files changed, 626 insertions, 0 deletions
diff --git a/drivers/i2c/chips/lm90.c b/drivers/i2c/chips/lm90.c new file mode 100644 index 00000000000..2c00ff83bab --- /dev/null +++ b/drivers/i2c/chips/lm90.c @@ -0,0 +1,626 @@ +/* + * lm90.c - Part of lm_sensors, Linux kernel modules for hardware + * monitoring + * Copyright (C) 2003-2004 Jean Delvare <khali@linux-fr.org> + * + * Based on the lm83 driver. The LM90 is a sensor chip made by National + * Semiconductor. It reports up to two temperatures (its own plus up to + * one external one) with a 0.125 deg resolution (1 deg for local + * temperature) and a 3-4 deg accuracy. Complete datasheet can be + * obtained from National's website at: + * http://www.national.com/pf/LM/LM90.html + * + * This driver also supports the LM89 and LM99, two other sensor chips + * made by National Semiconductor. Both have an increased remote + * temperature measurement accuracy (1 degree), and the LM99 + * additionally shifts remote temperatures (measured and limits) by 16 + * degrees, which allows for higher temperatures measurement. The + * driver doesn't handle it since it can be done easily in user-space. + * Complete datasheets can be obtained from National's website at: + * http://www.national.com/pf/LM/LM89.html + * http://www.national.com/pf/LM/LM99.html + * Note that there is no way to differenciate between both chips. + * + * This driver also supports the LM86, another sensor chip made by + * National Semiconductor. It is exactly similar to the LM90 except it + * has a higher accuracy. + * Complete datasheet can be obtained from National's website at: + * http://www.national.com/pf/LM/LM86.html + * + * This driver also supports the ADM1032, a sensor chip made by Analog + * Devices. That chip is similar to the LM90, with a few differences + * that are not handled by this driver. Complete datasheet can be + * obtained from Analog's website at: + * http://products.analog.com/products/info.asp?product=ADM1032 + * Among others, it has a higher accuracy than the LM90, much like the + * LM86 does. + * + * This driver also supports the MAX6657, MAX6658 and MAX6659 sensor + * chips made by Maxim. These chips are similar to the LM86. Complete + * datasheet can be obtained at Maxim's website at: + * http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2578 + * Note that there is no easy way to differenciate between the three + * variants. The extra address and features of the MAX6659 are not + * supported by this driver. + * + * This driver also supports the ADT7461 chip from Analog Devices but + * only in its "compatability mode". If an ADT7461 chip is found but + * is configured in non-compatible mode (where its temperature + * register values are decoded differently) it is ignored by this + * driver. Complete datasheet can be obtained from Analog's website + * at: + * http://products.analog.com/products/info.asp?product=ADT7461 + * + * Since the LM90 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 + * (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., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#include <linux/config.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/jiffies.h> +#include <linux/i2c.h> +#include <linux/i2c-sensor.h> + +/* + * Addresses to scan + * Address is fully defined internally and cannot be changed except for + * MAX6659. + * LM86, LM89, LM90, LM99, ADM1032, MAX6657 and MAX6658 have address 0x4c. + * LM89-1, and LM99-1 have address 0x4d. + * MAX6659 can have address 0x4c, 0x4d or 0x4e (unsupported). + * ADT7461 always has address 0x4c. + */ + +static unsigned short normal_i2c[] = { 0x4c, 0x4d, I2C_CLIENT_END }; +static unsigned int normal_isa[] = { I2C_CLIENT_ISA_END }; + +/* + * Insmod parameters + */ + +SENSORS_INSMOD_6(lm90, adm1032, lm99, lm86, max6657, adt7461); + +/* + * The LM90 registers + */ + +#define LM90_REG_R_MAN_ID 0xFE +#define LM90_REG_R_CHIP_ID 0xFF +#define LM90_REG_R_CONFIG1 0x03 +#define LM90_REG_W_CONFIG1 0x09 +#define LM90_REG_R_CONFIG2 0xBF +#define LM90_REG_W_CONFIG2 0xBF +#define LM90_REG_R_CONVRATE 0x04 +#define LM90_REG_W_CONVRATE 0x0A +#define LM90_REG_R_STATUS 0x02 +#define LM90_REG_R_LOCAL_TEMP 0x00 +#define LM90_REG_R_LOCAL_HIGH 0x05 +#define LM90_REG_W_LOCAL_HIGH 0x0B +#define LM90_REG_R_LOCAL_LOW 0x06 +#define LM90_REG_W_LOCAL_LOW 0x0C +#define LM90_REG_R_LOCAL_CRIT 0x20 +#define LM90_REG_W_LOCAL_CRIT 0x20 +#define LM90_REG_R_REMOTE_TEMPH 0x01 +#define LM90_REG_R_REMOTE_TEMPL 0x10 +#define LM90_REG_R_REMOTE_OFFSH 0x11 +#define LM90_REG_W_REMOTE_OFFSH 0x11 +#define LM90_REG_R_REMOTE_OFFSL 0x12 +#define LM90_REG_W_REMOTE_OFFSL 0x12 +#define LM90_REG_R_REMOTE_HIGHH 0x07 +#define LM90_REG_W_REMOTE_HIGHH 0x0D +#define LM90_REG_R_REMOTE_HIGHL 0x13 +#define LM90_REG_W_REMOTE_HIGHL 0x13 +#define LM90_REG_R_REMOTE_LOWH 0x08 +#define LM90_REG_W_REMOTE_LOWH 0x0E +#define LM90_REG_R_REMOTE_LOWL 0x14 +#define LM90_REG_W_REMOTE_LOWL 0x14 +#define LM90_REG_R_REMOTE_CRIT 0x19 +#define LM90_REG_W_REMOTE_CRIT 0x19 +#define LM90_REG_R_TCRIT_HYST 0x21 +#define LM90_REG_W_TCRIT_HYST 0x21 + +/* + * Conversions and various macros + * For local temperatures and limits, critical limits and the hysteresis + * value, the LM90 uses signed 8-bit values with LSB = 1 degree Celcius. + * For remote temperatures and limits, it uses signed 11-bit values with + * LSB = 0.125 degree Celcius, left-justified in 16-bit registers. + */ + +#define TEMP1_FROM_REG(val) ((val) * 1000) +#define TEMP1_TO_REG(val) ((val) <= -128000 ? -128 : \ + (val) >= 127000 ? 127 : \ + (val) < 0 ? ((val) - 500) / 1000 : \ + ((val) + 500) / 1000) +#define TEMP2_FROM_REG(val) ((val) / 32 * 125) +#define TEMP2_TO_REG(val) ((val) <= -128000 ? 0x8000 : \ + (val) >= 127875 ? 0x7FE0 : \ + (val) < 0 ? ((val) - 62) / 125 * 32 : \ + ((val) + 62) / 125 * 32) +#define HYST_TO_REG(val) ((val) <= 0 ? 0 : (val) >= 30500 ? 31 : \ + ((val) + 500) / 1000) + +/* + * ADT7461 is almost identical to LM90 except that attempts to write + * values that are outside the range 0 < temp < 127 are treated as + * the boundary value. + */ + +#define TEMP1_TO_REG_ADT7461(val) ((val) <= 0 ? 0 : \ + (val) >= 127000 ? 127 : \ + ((val) + 500) / 1000) +#define TEMP2_TO_REG_ADT7461(val) ((val) <= 0 ? 0 : \ + (val) >= 127750 ? 0x7FC0 : \ + ((val) + 125) / 250 * 64) + +/* + * Functions declaration + */ + +static int lm90_attach_adapter(struct i2c_adapter *adapter); +static int lm90_detect(struct i2c_adapter *adapter, int address, + int kind); +static void lm90_init_client(struct i2c_client *client); +static int lm90_detach_client(struct i2c_client *client); +static struct lm90_data *lm90_update_device(struct device *dev); + +/* + * Driver data (common to all clients) + */ + +static struct i2c_driver lm90_driver = { + .owner = THIS_MODULE, + .name = "lm90", + .id = I2C_DRIVERID_LM90, + .flags = I2C_DF_NOTIFY, + .attach_adapter = lm90_attach_adapter, + .detach_client = lm90_detach_client, +}; + +/* + * Client data (each client gets its own) + */ + +struct lm90_data { + struct i2c_client client; + struct semaphore update_lock; + char valid; /* zero until following fields are valid */ + unsigned long last_updated; /* in jiffies */ + int kind; + + /* registers values */ + s8 temp_input1, temp_low1, temp_high1; /* local */ + s16 temp_input2, temp_low2, temp_high2; /* remote, combined */ + s8 temp_crit1, temp_crit2; + u8 temp_hyst; + u8 alarms; /* bitvector */ +}; + +/* + * Sysfs stuff + */ + +#define show_temp(value, converter) \ +static ssize_t show_##value(struct device *dev, char *buf) \ +{ \ + struct lm90_data *data = lm90_update_device(dev); \ + return sprintf(buf, "%d\n", converter(data->value)); \ +} +show_temp(temp_input1, TEMP1_FROM_REG); +show_temp(temp_input2, TEMP2_FROM_REG); +show_temp(temp_low1, TEMP1_FROM_REG); +show_temp(temp_low2, TEMP2_FROM_REG); +show_temp(temp_high1, TEMP1_FROM_REG); +show_temp(temp_high2, TEMP2_FROM_REG); +show_temp(temp_crit1, TEMP1_FROM_REG); +show_temp(temp_crit2, TEMP1_FROM_REG); + +#define set_temp1(value, reg) \ +static ssize_t set_##value(struct device *dev, const char *buf, \ + size_t count) \ +{ \ + struct i2c_client *client = to_i2c_client(dev); \ + struct lm90_data *data = i2c_get_clientdata(client); \ + long val = simple_strtol(buf, NULL, 10); \ + \ + down(&data->update_lock); \ + if (data->kind == adt7461) \ + data->value = TEMP1_TO_REG_ADT7461(val); \ + else \ + data->value = TEMP1_TO_REG(val); \ + i2c_smbus_write_byte_data(client, reg, data->value); \ + up(&data->update_lock); \ + return count; \ +} +#define set_temp2(value, regh, regl) \ +static ssize_t set_##value(struct device *dev, const char *buf, \ + size_t count) \ +{ \ + struct i2c_client *client = to_i2c_client(dev); \ + struct lm90_data *data = i2c_get_clientdata(client); \ + long val = simple_strtol(buf, NULL, 10); \ + \ + down(&data->update_lock); \ + if (data->kind == adt7461) \ + data->value = TEMP2_TO_REG_ADT7461(val); \ + else \ + data->value = TEMP2_TO_REG(val); \ + i2c_smbus_write_byte_data(client, regh, data->value >> 8); \ + i2c_smbus_write_byte_data(client, regl, data->value & 0xff); \ + up(&data->update_lock); \ + return count; \ +} +set_temp1(temp_low1, LM90_REG_W_LOCAL_LOW); +set_temp2(temp_low2, LM90_REG_W_REMOTE_LOWH, LM90_REG_W_REMOTE_LOWL); +set_temp1(temp_high1, LM90_REG_W_LOCAL_HIGH); +set_temp2(temp_high2, LM90_REG_W_REMOTE_HIGHH, LM90_REG_W_REMOTE_HIGHL); +set_temp1(temp_crit1, LM90_REG_W_LOCAL_CRIT); +set_temp1(temp_crit2, LM90_REG_W_REMOTE_CRIT); + +#define show_temp_hyst(value, basereg) \ +static ssize_t show_##value(struct device *dev, char *buf) \ +{ \ + struct lm90_data *data = lm90_update_device(dev); \ + return sprintf(buf, "%d\n", TEMP1_FROM_REG(data->basereg) \ + - TEMP1_FROM_REG(data->temp_hyst)); \ +} +show_temp_hyst(temp_hyst1, temp_crit1); +show_temp_hyst(temp_hyst2, temp_crit2); + +static ssize_t set_temp_hyst1(struct device *dev, const char *buf, + size_t count) +{ + struct i2c_client *client = to_i2c_client(dev); + struct lm90_data *data = i2c_get_clientdata(client); + long val = simple_strtol(buf, NULL, 10); + long hyst; + + down(&data->update_lock); + hyst = TEMP1_FROM_REG(data->temp_crit1) - val; + i2c_smbus_write_byte_data(client, LM90_REG_W_TCRIT_HYST, + HYST_TO_REG(hyst)); + up(&data->update_lock); + return count; +} + +static ssize_t show_alarms(struct device *dev, char *buf) +{ + struct lm90_data *data = lm90_update_device(dev); + return sprintf(buf, "%d\n", data->alarms); +} + +static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL); +static DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_input2, NULL); +static DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp_low1, + set_temp_low1); +static DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp_low2, + set_temp_low2); +static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_high1, + set_temp_high1); +static DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp_high2, + set_temp_high2); +static DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp_crit1, + set_temp_crit1); +static DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp_crit2, + set_temp_crit2); +static DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temp_hyst1, + set_temp_hyst1); +static DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_temp_hyst2, NULL); +static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); + +/* + * Real code + */ + +static int lm90_attach_adapter(struct i2c_adapter *adapter) +{ + if (!(adapter->class & I2C_CLASS_HWMON)) + return 0; + return i2c_detect(adapter, &addr_data, lm90_detect); +} + +/* + * The following function does more than just detection. If detection + * succeeds, it also registers the new chip. + */ +static int lm90_detect(struct i2c_adapter *adapter, int address, int kind) +{ + struct i2c_client *new_client; + struct lm90_data *data; + int err = 0; + const char *name = ""; + + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) + goto exit; + + if (!(data = kmalloc(sizeof(struct lm90_data), GFP_KERNEL))) { + err = -ENOMEM; + goto exit; + } + memset(data, 0, sizeof(struct lm90_data)); + + /* The common I2C client data is placed right before the + LM90-specific data. */ + new_client = &data->client; + i2c_set_clientdata(new_client, data); + new_client->addr = address; + new_client->adapter = adapter; + new_client->driver = &lm90_driver; + new_client->flags = 0; + + /* + * Now we do the remaining detection. A negative kind means that + * the driver was loaded with no force parameter (default), so we + * must both detect and identify the chip. A zero kind means that + * the driver was loaded with the force parameter, the detection + * step shall be skipped. A positive kind means that the driver + * was loaded with the force parameter and a given kind of chip is + * requested, so both the detection and the identification steps + * are skipped. + */ + + /* Default to an LM90 if forced */ + if (kind == 0) + kind = lm90; + + if (kind < 0) { /* detection and identification */ + u8 man_id, chip_id, reg_config1, reg_convrate; + + man_id = i2c_smbus_read_byte_data(new_client, + LM90_REG_R_MAN_ID); + chip_id = i2c_smbus_read_byte_data(new_client, + LM90_REG_R_CHIP_ID); + reg_config1 = i2c_smbus_read_byte_data(new_client, + LM90_REG_R_CONFIG1); + reg_convrate = i2c_smbus_read_byte_data(new_client, + LM90_REG_R_CONVRATE); + + if (man_id == 0x01) { /* National Semiconductor */ + u8 reg_config2; + + reg_config2 = i2c_smbus_read_byte_data(new_client, + LM90_REG_R_CONFIG2); + + if ((reg_config1 & 0x2A) == 0x00 + && (reg_config2 & 0xF8) == 0x00 + && reg_convrate <= 0x09) { + if (address == 0x4C + && (chip_id & 0xF0) == 0x20) { /* LM90 */ + kind = lm90; + } else + if ((chip_id & 0xF0) == 0x30) { /* LM89/LM99 */ + kind = lm99; + } else + if (address == 0x4C + && (chip_id & 0xF0) == 0x10) { /* LM86 */ + kind = lm86; + } + } + } else + if (man_id == 0x41) { /* Analog Devices */ + if (address == 0x4C + && (chip_id & 0xF0) == 0x40 /* ADM1032 */ + && (reg_config1 & 0x3F) == 0x00 + && reg_convrate <= 0x0A) { + kind = adm1032; + } else + if (address == 0x4c + && chip_id == 0x51 /* ADT7461 */ + && (reg_config1 & 0x1F) == 0x00 /* check compat mode */ + && reg_convrate <= 0x0A) { + kind = adt7461; + } + } else + if (man_id == 0x4D) { /* Maxim */ + /* + * The Maxim variants do NOT have a chip_id register. + * Reading from that address will return the last read + * value, which in our case is those of the man_id + * register. Likewise, the config1 register seems to + * lack a low nibble, so the value will be those of the + * previous read, so in our case those of the man_id + * register. + */ + if (chip_id == man_id + && (reg_config1 & 0x1F) == (man_id & 0x0F) + && reg_convrate <= 0x09) { + kind = max6657; + } + } + + if (kind <= 0) { /* identification failed */ + dev_info(&adapter->dev, + "Unsupported chip (man_id=0x%02X, " + "chip_id=0x%02X).\n", man_id, chip_id); + goto exit_free; + } + } + + if (kind == lm90) { + name = "lm90"; + } else if (kind == adm1032) { + name = "adm1032"; + } else if (kind == lm99) { + name = "lm99"; + } else if (kind == lm86) { + name = "lm86"; + } else if (kind == max6657) { + name = "max6657"; + } else if (kind == adt7461) { + name = "adt7461"; + } + + /* We can fill in the remaining client fields */ + strlcpy(new_client->name, name, I2C_NAME_SIZE); + data->valid = 0; + data->kind = kind; + init_MUTEX(&data->update_lock); + + /* Tell the I2C layer a new client has arrived */ + if ((err = i2c_attach_client(new_client))) + goto exit_free; + + /* Initialize the LM90 chip */ + lm90_init_client(new_client); + + /* Register sysfs hooks */ + device_create_file(&new_client->dev, &dev_attr_temp1_input); + device_create_file(&new_client->dev, &dev_attr_temp2_input); + device_create_file(&new_client->dev, &dev_attr_temp1_min); + device_create_file(&new_client->dev, &dev_attr_temp2_min); + device_create_file(&new_client->dev, &dev_attr_temp1_max); + device_create_file(&new_client->dev, &dev_attr_temp2_max); + device_create_file(&new_client->dev, &dev_attr_temp1_crit); + device_create_file(&new_client->dev, &dev_attr_temp2_crit); + device_create_file(&new_client->dev, &dev_attr_temp1_crit_hyst); + device_create_file(&new_client->dev, &dev_attr_temp2_crit_hyst); + device_create_file(&new_client->dev, &dev_attr_alarms); + + return 0; + +exit_free: + kfree(data); +exit: + return err; +} + +static void lm90_init_client(struct i2c_client *client) +{ + u8 config; + + /* + * Start the conversions. + */ + i2c_smbus_write_byte_data(client, LM90_REG_W_CONVRATE, + 5); /* 2 Hz */ + config = i2c_smbus_read_byte_data(client, LM90_REG_R_CONFIG1); + if (config & 0x40) + i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, + config & 0xBF); /* run */ +} + +static int lm90_detach_client(struct i2c_client *client) +{ + int err; + + if ((err = i2c_detach_client(client))) { + dev_err(&client->dev, "Client deregistration failed, " + "client not detached.\n"); + return err; + } + + kfree(i2c_get_clientdata(client)); + return 0; +} + +static struct lm90_data *lm90_update_device(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct lm90_data *data = i2c_get_clientdata(client); + + down(&data->update_lock); + + if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) { + u8 oldh, newh; + + dev_dbg(&client->dev, "Updating lm90 data.\n"); + data->temp_input1 = i2c_smbus_read_byte_data(client, + LM90_REG_R_LOCAL_TEMP); + data->temp_high1 = i2c_smbus_read_byte_data(client, + LM90_REG_R_LOCAL_HIGH); + data->temp_low1 = i2c_smbus_read_byte_data(client, + LM90_REG_R_LOCAL_LOW); + data->temp_crit1 = i2c_smbus_read_byte_data(client, + LM90_REG_R_LOCAL_CRIT); + data->temp_crit2 = i2c_smbus_read_byte_data(client, + LM90_REG_R_REMOTE_CRIT); + data->temp_hyst = i2c_smbus_read_byte_data(client, + LM90_REG_R_TCRIT_HYST); + + /* + * There is a trick here. We have to read two registers to + * have the remote sensor temperature, but we have to beware + * a conversion could occur inbetween the readings. The + * datasheet says we should either use the one-shot + * conversion register, which we don't want to do (disables + * hardware monitoring) or monitor the busy bit, which is + * impossible (we can't read the values and monitor that bit + * at the exact same time). So the solution used here is to + * read the high byte once, then the low byte, then the high + * byte again. If the new high byte matches the old one, + * then we have a valid reading. Else we have to read the low + * byte again, and now we believe we have a correct reading. + */ + oldh = i2c_smbus_read_byte_data(client, + LM90_REG_R_REMOTE_TEMPH); + data->temp_input2 = i2c_smbus_read_byte_data(client, + LM90_REG_R_REMOTE_TEMPL); + newh = i2c_smbus_read_byte_data(client, + LM90_REG_R_REMOTE_TEMPH); + if (newh != oldh) { + data->temp_input2 = i2c_smbus_read_byte_data(client, + LM90_REG_R_REMOTE_TEMPL); +#ifdef DEBUG + oldh = i2c_smbus_read_byte_data(client, + LM90_REG_R_REMOTE_TEMPH); + /* oldh is actually newer */ + if (newh != oldh) + dev_warn(&client->dev, "Remote temperature may be " + "wrong.\n"); +#endif + } + data->temp_input2 |= (newh << 8); + + data->temp_high2 = (i2c_smbus_read_byte_data(client, + LM90_REG_R_REMOTE_HIGHH) << 8) + + i2c_smbus_read_byte_data(client, + LM90_REG_R_REMOTE_HIGHL); + data->temp_low2 = (i2c_smbus_read_byte_data(client, + LM90_REG_R_REMOTE_LOWH) << 8) + + i2c_smbus_read_byte_data(client, + LM90_REG_R_REMOTE_LOWL); + data->alarms = i2c_smbus_read_byte_data(client, + LM90_REG_R_STATUS); + + data->last_updated = jiffies; + data->valid = 1; + } + + up(&data->update_lock); + + return data; +} + +static int __init sensors_lm90_init(void) +{ + return i2c_add_driver(&lm90_driver); +} + +static void __exit sensors_lm90_exit(void) +{ + i2c_del_driver(&lm90_driver); +} + +MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>"); +MODULE_DESCRIPTION("LM90/ADM1032 driver"); +MODULE_LICENSE("GPL"); + +module_init(sensors_lm90_init); +module_exit(sensors_lm90_exit); |