diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/hwmon/lm90.c | 523 |
1 files changed, 256 insertions, 267 deletions
diff --git a/drivers/hwmon/lm90.c b/drivers/hwmon/lm90.c index 366bb62..302d9eb 100644 --- a/drivers/hwmon/lm90.c +++ b/drivers/hwmon/lm90.c @@ -164,21 +164,6 @@ enum chips { lm90, adm1032, lm99, lm86, max6657, max6659, adt7461, max6680, #define LM90_HAVE_TEMP3 (1 << 6) /* 3rd temperature sensor */ /* - * Functions declaration - */ - -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); -static inline void lm90_select_remote_channel(struct i2c_client *client, - struct lm90_data *data, - int channel); - -/* * Driver data (common to all clients) */ @@ -204,19 +189,6 @@ static const struct i2c_device_id lm90_id[] = { }; MODULE_DEVICE_TABLE(i2c, lm90_id); -static struct i2c_driver lm90_driver = { - .class = I2C_CLASS_HWMON, - .driver = { - .name = "lm90", - }, - .probe = lm90_probe, - .remove = lm90_remove, - .alert = lm90_alert, - .id_table = lm90_id, - .detect = lm90_detect, - .address_list = normal_i2c, -}; - /* * Client data (each client gets its own) */ @@ -256,6 +228,209 @@ struct lm90_data { }; /* + * Support functions + */ + +/* + * The ADM1032 supports PEC but not on write byte transactions, so we need + * to explicitly ask for a transaction without PEC. + */ +static inline s32 adm1032_write_byte(struct i2c_client *client, u8 value) +{ + return i2c_smbus_xfer(client->adapter, client->addr, + client->flags & ~I2C_CLIENT_PEC, + I2C_SMBUS_WRITE, value, I2C_SMBUS_BYTE, NULL); +} + +/* + * It is assumed that client->update_lock is held (unless we are in + * detection or initialization steps). This matters when PEC is enabled, + * because we don't want the address pointer to change between the write + * byte and the read byte transactions. + */ +static int lm90_read_reg(struct i2c_client *client, u8 reg, u8 *value) +{ + int err; + + if (client->flags & I2C_CLIENT_PEC) { + err = adm1032_write_byte(client, reg); + if (err >= 0) + err = i2c_smbus_read_byte(client); + } else + err = i2c_smbus_read_byte_data(client, reg); + + if (err < 0) { + dev_warn(&client->dev, "Register %#02x read failed (%d)\n", + reg, err); + return err; + } + *value = err; + + return 0; +} + +static int lm90_read16(struct i2c_client *client, u8 regh, u8 regl, u16 *value) +{ + int err; + u8 oldh, newh, l; + + /* + * There is a trick here. We have to read two registers to have the + * 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. + */ + if ((err = lm90_read_reg(client, regh, &oldh)) + || (err = lm90_read_reg(client, regl, &l)) + || (err = lm90_read_reg(client, regh, &newh))) + return err; + if (oldh != newh) { + err = lm90_read_reg(client, regl, &l); + if (err) + return err; + } + *value = (newh << 8) | l; + + return 0; +} + +/* + * client->update_lock must be held when calling this function (unless we are + * in detection or initialization steps), and while a remote channel other + * than channel 0 is selected. Also, calling code must make sure to re-select + * external channel 0 before releasing the lock. This is necessary because + * various registers have different meanings as a result of selecting a + * non-default remote channel. + */ +static inline void lm90_select_remote_channel(struct i2c_client *client, + struct lm90_data *data, + int channel) +{ + u8 config; + + if (data->kind == max6696) { + lm90_read_reg(client, LM90_REG_R_CONFIG1, &config); + config &= ~0x08; + if (channel) + config |= 0x08; + i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, + config); + } +} + +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); + + mutex_lock(&data->update_lock); + + if (time_after(jiffies, data->last_updated + HZ / 2 + HZ / 10) + || !data->valid) { + u8 h, l; + u8 alarms; + + dev_dbg(&client->dev, "Updating lm90 data.\n"); + lm90_read_reg(client, LM90_REG_R_LOCAL_LOW, &data->temp8[0]); + lm90_read_reg(client, LM90_REG_R_LOCAL_HIGH, &data->temp8[1]); + lm90_read_reg(client, LM90_REG_R_LOCAL_CRIT, &data->temp8[2]); + lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT, &data->temp8[3]); + lm90_read_reg(client, LM90_REG_R_TCRIT_HYST, &data->temp_hyst); + + if (data->flags & LM90_HAVE_LOCAL_EXT) { + lm90_read16(client, LM90_REG_R_LOCAL_TEMP, + MAX6657_REG_R_LOCAL_TEMPL, + &data->temp11[4]); + } else { + if (lm90_read_reg(client, LM90_REG_R_LOCAL_TEMP, + &h) == 0) + data->temp11[4] = h << 8; + } + lm90_read16(client, LM90_REG_R_REMOTE_TEMPH, + LM90_REG_R_REMOTE_TEMPL, &data->temp11[0]); + + if (lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH, &h) == 0) { + data->temp11[1] = h << 8; + if ((data->flags & LM90_HAVE_REM_LIMIT_EXT) + && lm90_read_reg(client, LM90_REG_R_REMOTE_LOWL, + &l) == 0) + data->temp11[1] |= l; + } + if (lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH, &h) == 0) { + data->temp11[2] = h << 8; + if ((data->flags & LM90_HAVE_REM_LIMIT_EXT) + && lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHL, + &l) == 0) + data->temp11[2] |= l; + } + + if (data->flags & LM90_HAVE_OFFSET) { + if (lm90_read_reg(client, LM90_REG_R_REMOTE_OFFSH, + &h) == 0 + && lm90_read_reg(client, LM90_REG_R_REMOTE_OFFSL, + &l) == 0) + data->temp11[3] = (h << 8) | l; + } + if (data->flags & LM90_HAVE_EMERGENCY) { + lm90_read_reg(client, MAX6659_REG_R_LOCAL_EMERG, + &data->temp8[4]); + lm90_read_reg(client, MAX6659_REG_R_REMOTE_EMERG, + &data->temp8[5]); + } + lm90_read_reg(client, LM90_REG_R_STATUS, &alarms); + data->alarms = alarms; /* save as 16 bit value */ + + if (data->kind == max6696) { + lm90_select_remote_channel(client, data, 1); + lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT, + &data->temp8[6]); + lm90_read_reg(client, MAX6659_REG_R_REMOTE_EMERG, + &data->temp8[7]); + lm90_read16(client, LM90_REG_R_REMOTE_TEMPH, + LM90_REG_R_REMOTE_TEMPL, &data->temp11[5]); + if (!lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH, &h)) + data->temp11[6] = h << 8; + if (!lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH, &h)) + data->temp11[7] = h << 8; + lm90_select_remote_channel(client, data, 0); + + if (!lm90_read_reg(client, MAX6696_REG_R_STATUS2, + &alarms)) + data->alarms |= alarms << 8; + } + + /* 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; + } + + mutex_unlock(&data->update_lock); + + return data; +} + +/* * Conversions * For local temperatures and limits, critical limits and the hysteresis * value, the LM90 uses signed 8-bit values with LSB = 1 degree Celsius. @@ -770,68 +945,6 @@ static DEVICE_ATTR(pec, S_IWUSR | S_IRUGO, show_pec, set_pec); * Real code */ -/* - * The ADM1032 supports PEC but not on write byte transactions, so we need - * to explicitly ask for a transaction without PEC. - */ -static inline s32 adm1032_write_byte(struct i2c_client *client, u8 value) -{ - return i2c_smbus_xfer(client->adapter, client->addr, - client->flags & ~I2C_CLIENT_PEC, - I2C_SMBUS_WRITE, value, I2C_SMBUS_BYTE, NULL); -} - -/* - * It is assumed that client->update_lock is held (unless we are in - * detection or initialization steps). This matters when PEC is enabled, - * because we don't want the address pointer to change between the write - * byte and the read byte transactions. - */ -static int lm90_read_reg(struct i2c_client *client, u8 reg, u8 *value) -{ - int err; - - if (client->flags & I2C_CLIENT_PEC) { - err = adm1032_write_byte(client, reg); - if (err >= 0) - err = i2c_smbus_read_byte(client); - } else - err = i2c_smbus_read_byte_data(client, reg); - - if (err < 0) { - dev_warn(&client->dev, "Register %#02x read failed (%d)\n", - reg, err); - return err; - } - *value = err; - - return 0; -} - -/* - * client->update_lock must be held when calling this function (unless we are - * in detection or initialization steps), and while a remote channel other - * than channel 0 is selected. Also, calling code must make sure to re-select - * external channel 0 before releasing the lock. This is necessary because - * various registers have different meanings as a result of selecting a - * non-default remote channel. - */ -static inline void lm90_select_remote_channel(struct i2c_client *client, - struct lm90_data *data, - int channel) -{ - u8 config; - - if (data->kind == max6696) { - lm90_read_reg(client, LM90_REG_R_CONFIG1, &config); - config &= ~0x08; - if (channel) - config |= 0x08; - i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, - config); - } -} - /* Return 0 if detection is successful, -ENODEV otherwise */ static int lm90_detect(struct i2c_client *new_client, struct i2c_board_info *info) @@ -1023,6 +1136,47 @@ static void lm90_remove_files(struct i2c_client *client, struct lm90_data *data) sysfs_remove_group(&client->dev.kobj, &lm90_group); } +static void lm90_init_client(struct i2c_client *client) +{ + u8 config; + struct lm90_data *data = i2c_get_clientdata(client); + + /* + * Start the conversions. + */ + i2c_smbus_write_byte_data(client, LM90_REG_W_CONVRATE, + 5); /* 2 Hz */ + if (lm90_read_reg(client, LM90_REG_R_CONFIG1, &config) < 0) { + dev_warn(&client->dev, "Initialization failed!\n"); + return; + } + data->config_orig = config; + + /* Check Temperature Range Select */ + if (data->kind == adt7461) { + if (config & 0x04) + data->flags |= LM90_FLAG_ADT7461_EXT; + } + + /* + * Put MAX6680/MAX8881 into extended resolution (bit 0x10, + * 0.125 degree resolution) and range (0x08, extend range + * to -64 degree) mode for the remote temperature sensor. + */ + if (data->kind == max6680) + config |= 0x18; + + /* + * Select external channel 0 for max6695/96 + */ + if (data->kind == max6696) + config &= ~0x08; + + config &= 0xBF; /* run */ + if (config != data->config_orig) /* Only write if changed */ + i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, config); +} + static int lm90_probe(struct i2c_client *new_client, const struct i2c_device_id *id) { @@ -1134,47 +1288,6 @@ exit: return err; } -static void lm90_init_client(struct i2c_client *client) -{ - u8 config; - struct lm90_data *data = i2c_get_clientdata(client); - - /* - * Start the conversions. - */ - i2c_smbus_write_byte_data(client, LM90_REG_W_CONVRATE, - 5); /* 2 Hz */ - if (lm90_read_reg(client, LM90_REG_R_CONFIG1, &config) < 0) { - dev_warn(&client->dev, "Initialization failed!\n"); - return; - } - data->config_orig = config; - - /* Check Temperature Range Select */ - if (data->kind == adt7461) { - if (config & 0x04) - data->flags |= LM90_FLAG_ADT7461_EXT; - } - - /* - * Put MAX6680/MAX8881 into extended resolution (bit 0x10, - * 0.125 degree resolution) and range (0x08, extend range - * to -64 degree) mode for the remote temperature sensor. - */ - if (data->kind == max6680) - config |= 0x18; - - /* - * Select external channel 0 for max6695/96 - */ - if (data->kind == max6696) - config &= ~0x08; - - config &= 0xBF; /* run */ - if (config != data->config_orig) /* Only write if changed */ - i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, config); -} - static int lm90_remove(struct i2c_client *client) { struct lm90_data *data = i2c_get_clientdata(client); @@ -1230,142 +1343,18 @@ static void lm90_alert(struct i2c_client *client, unsigned int flag) } } -static int lm90_read16(struct i2c_client *client, u8 regh, u8 regl, u16 *value) -{ - int err; - u8 oldh, newh, l; - - /* - * There is a trick here. We have to read two registers to have the - * 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. - */ - if ((err = lm90_read_reg(client, regh, &oldh)) - || (err = lm90_read_reg(client, regl, &l)) - || (err = lm90_read_reg(client, regh, &newh))) - return err; - if (oldh != newh) { - err = lm90_read_reg(client, regl, &l); - if (err) - return err; - } - *value = (newh << 8) | l; - - 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); - - mutex_lock(&data->update_lock); - - if (time_after(jiffies, data->last_updated + HZ / 2 + HZ / 10) - || !data->valid) { - u8 h, l; - u8 alarms; - - dev_dbg(&client->dev, "Updating lm90 data.\n"); - lm90_read_reg(client, LM90_REG_R_LOCAL_LOW, &data->temp8[0]); - lm90_read_reg(client, LM90_REG_R_LOCAL_HIGH, &data->temp8[1]); - lm90_read_reg(client, LM90_REG_R_LOCAL_CRIT, &data->temp8[2]); - lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT, &data->temp8[3]); - lm90_read_reg(client, LM90_REG_R_TCRIT_HYST, &data->temp_hyst); - - if (data->flags & LM90_HAVE_LOCAL_EXT) { - lm90_read16(client, LM90_REG_R_LOCAL_TEMP, - MAX6657_REG_R_LOCAL_TEMPL, - &data->temp11[4]); - } else { - if (lm90_read_reg(client, LM90_REG_R_LOCAL_TEMP, - &h) == 0) - data->temp11[4] = h << 8; - } - lm90_read16(client, LM90_REG_R_REMOTE_TEMPH, - LM90_REG_R_REMOTE_TEMPL, &data->temp11[0]); - - if (lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH, &h) == 0) { - data->temp11[1] = h << 8; - if ((data->flags & LM90_HAVE_REM_LIMIT_EXT) - && lm90_read_reg(client, LM90_REG_R_REMOTE_LOWL, - &l) == 0) - data->temp11[1] |= l; - } - if (lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH, &h) == 0) { - data->temp11[2] = h << 8; - if ((data->flags & LM90_HAVE_REM_LIMIT_EXT) - && lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHL, - &l) == 0) - data->temp11[2] |= l; - } - - if (data->flags & LM90_HAVE_OFFSET) { - if (lm90_read_reg(client, LM90_REG_R_REMOTE_OFFSH, - &h) == 0 - && lm90_read_reg(client, LM90_REG_R_REMOTE_OFFSL, - &l) == 0) - data->temp11[3] = (h << 8) | l; - } - if (data->flags & LM90_HAVE_EMERGENCY) { - lm90_read_reg(client, MAX6659_REG_R_LOCAL_EMERG, - &data->temp8[4]); - lm90_read_reg(client, MAX6659_REG_R_REMOTE_EMERG, - &data->temp8[5]); - } - lm90_read_reg(client, LM90_REG_R_STATUS, &alarms); - data->alarms = alarms; /* save as 16 bit value */ - - if (data->kind == max6696) { - lm90_select_remote_channel(client, data, 1); - lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT, - &data->temp8[6]); - lm90_read_reg(client, MAX6659_REG_R_REMOTE_EMERG, - &data->temp8[7]); - lm90_read16(client, LM90_REG_R_REMOTE_TEMPH, - LM90_REG_R_REMOTE_TEMPL, &data->temp11[5]); - if (!lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH, &h)) - data->temp11[6] = h << 8; - if (!lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH, &h)) - data->temp11[7] = h << 8; - lm90_select_remote_channel(client, data, 0); - - if (!lm90_read_reg(client, MAX6696_REG_R_STATUS2, - &alarms)) - data->alarms |= alarms << 8; - } - - /* 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; - } - - mutex_unlock(&data->update_lock); - - return data; -} +static struct i2c_driver lm90_driver = { + .class = I2C_CLASS_HWMON, + .driver = { + .name = "lm90", + }, + .probe = lm90_probe, + .remove = lm90_remove, + .alert = lm90_alert, + .id_table = lm90_id, + .detect = lm90_detect, + .address_list = normal_i2c, +}; static int __init sensors_lm90_init(void) { |
