diff options
Diffstat (limited to 'drivers/hwmon/lm90.c')
| -rw-r--r-- | drivers/hwmon/lm90.c | 89 |
1 files changed, 84 insertions, 5 deletions
diff --git a/drivers/hwmon/lm90.c b/drivers/hwmon/lm90.c index 7c9bdc16742..7cc2708871a 100644 --- a/drivers/hwmon/lm90.c +++ b/drivers/hwmon/lm90.c @@ -1,7 +1,7 @@ /* * lm90.c - Part of lm_sensors, Linux kernel modules for hardware * monitoring - * Copyright (C) 2003-2009 Jean Delvare <khali@linux-fr.org> + * Copyright (C) 2003-2010 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 @@ -93,7 +93,8 @@ static const unsigned short normal_i2c[] = { 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END }; -enum chips { lm90, adm1032, lm99, lm86, max6657, adt7461, max6680, max6646 }; +enum chips { lm90, adm1032, lm99, lm86, max6657, adt7461, max6680, max6646, + w83l771 }; /* * The LM90 registers @@ -151,6 +152,7 @@ static int lm90_detect(struct i2c_client *client, struct i2c_board_info *info); static int lm90_probe(struct i2c_client *client, const struct i2c_device_id *id); static void lm90_init_client(struct i2c_client *client); +static void lm90_alert(struct i2c_client *client, unsigned int flag); static int lm90_remove(struct i2c_client *client); static struct lm90_data *lm90_update_device(struct device *dev); @@ -173,6 +175,7 @@ static const struct i2c_device_id lm90_id[] = { { "max6659", max6657 }, { "max6680", max6680 }, { "max6681", max6680 }, + { "w83l771", w83l771 }, { } }; MODULE_DEVICE_TABLE(i2c, lm90_id); @@ -184,6 +187,7 @@ static struct i2c_driver lm90_driver = { }, .probe = lm90_probe, .remove = lm90_remove, + .alert = lm90_alert, .id_table = lm90_id, .detect = lm90_detect, .address_list = normal_i2c, @@ -201,6 +205,9 @@ struct lm90_data { int kind; int flags; + u8 config_orig; /* Original configuration register value */ + u8 alert_alarms; /* Which alarm bits trigger ALERT# */ + /* registers values */ s8 temp8[4]; /* 0: local low limit 1: local high limit @@ -758,6 +765,14 @@ static int lm90_detect(struct i2c_client *new_client, && reg_convrate <= 0x07) { name = "max6646"; } + } else + if (address == 0x4C + && man_id == 0x5C) { /* Winbond/Nuvoton */ + if ((chip_id & 0xFE) == 0x10 /* W83L771AWG/ASG */ + && (reg_config1 & 0x2A) == 0x00 + && reg_convrate <= 0x08) { + name = "w83l771"; + } } if (!name) { /* identification failed */ @@ -794,6 +809,19 @@ static int lm90_probe(struct i2c_client *new_client, new_client->flags &= ~I2C_CLIENT_PEC; } + /* Different devices have different alarm bits triggering the + * ALERT# output */ + switch (data->kind) { + case lm90: + case lm99: + case lm86: + data->alert_alarms = 0x7b; + break; + default: + data->alert_alarms = 0x7c; + break; + } + /* Initialize the LM90 chip */ lm90_init_client(new_client); @@ -830,7 +858,7 @@ exit: static void lm90_init_client(struct i2c_client *client) { - u8 config, config_orig; + u8 config; struct lm90_data *data = i2c_get_clientdata(client); /* @@ -842,7 +870,7 @@ static void lm90_init_client(struct i2c_client *client) dev_warn(&client->dev, "Initialization failed!\n"); return; } - config_orig = config; + data->config_orig = config; /* Check Temperature Range Select */ if (data->kind == adt7461) { @@ -860,7 +888,7 @@ static void lm90_init_client(struct i2c_client *client) } config &= 0xBF; /* run */ - if (config != config_orig) /* Only write if changed */ + if (config != data->config_orig) /* Only write if changed */ i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, config); } @@ -875,10 +903,46 @@ static int lm90_remove(struct i2c_client *client) device_remove_file(&client->dev, &sensor_dev_attr_temp2_offset.dev_attr); + /* Restore initial configuration */ + i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, + data->config_orig); + kfree(data); return 0; } +static void lm90_alert(struct i2c_client *client, unsigned int flag) +{ + struct lm90_data *data = i2c_get_clientdata(client); + u8 config, alarms; + + lm90_read_reg(client, LM90_REG_R_STATUS, &alarms); + if ((alarms & 0x7f) == 0) { + dev_info(&client->dev, "Everything OK\n"); + } else { + if (alarms & 0x61) + dev_warn(&client->dev, + "temp%d out of range, please check!\n", 1); + if (alarms & 0x1a) + dev_warn(&client->dev, + "temp%d out of range, please check!\n", 2); + if (alarms & 0x04) + dev_warn(&client->dev, + "temp%d diode open, please check!\n", 2); + + /* Disable ALERT# output, because these chips don't implement + SMBus alert correctly; they should only hold the alert line + low briefly. */ + if ((data->kind == adm1032 || data->kind == adt7461) + && (alarms & data->alert_alarms)) { + dev_dbg(&client->dev, "Disabling ALERT#\n"); + lm90_read_reg(client, LM90_REG_R_CONFIG1, &config); + i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, + config | 0x80); + } + } +} + static int lm90_read16(struct i2c_client *client, u8 regh, u8 regl, u16 *value) { int err; @@ -966,6 +1030,21 @@ static struct lm90_data *lm90_update_device(struct device *dev) } lm90_read_reg(client, LM90_REG_R_STATUS, &data->alarms); + /* Re-enable ALERT# output if it was originally enabled and + * relevant alarms are all clear */ + if ((data->config_orig & 0x80) == 0 + && (data->alarms & data->alert_alarms) == 0) { + u8 config; + + lm90_read_reg(client, LM90_REG_R_CONFIG1, &config); + if (config & 0x80) { + dev_dbg(&client->dev, "Re-enabling ALERT#\n"); + i2c_smbus_write_byte_data(client, + LM90_REG_W_CONFIG1, + config & ~0x80); + } + } + data->last_updated = jiffies; data->valid = 1; } |