diff options
| author | Shubhrajyoti Datta <shubhrajyoti@ti.com> | 2010-08-14 21:08:50 +0200 |
|---|---|---|
| committer | Jean Delvare <khali@linux-fr.org> | 2010-08-14 21:08:50 +0200 |
| commit | 9914518e79800c977e20eda1335d43a4df813e3d (patch) | |
| tree | 48cc84975364ad67932b184722dce594a67650de | |
| parent | 960f12f4d1eb5ba3c76dc6b57a909a65dd59e1c2 (diff) | |
hwmon: (lm75) Add suspend/resume feature
There is a shutdown feature at suspend it can be enabled to
reduce current consumption and resume it can be switched off.
Signed-off-by: Shubhrajyoti Datta <shubhrajyoti@ti.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
| -rw-r--r-- | drivers/hwmon/lm75.c | 39 | ||||
| -rw-r--r-- | drivers/hwmon/lm75.h | 1 |
2 files changed, 40 insertions, 0 deletions
diff --git a/drivers/hwmon/lm75.c b/drivers/hwmon/lm75.c index 393f354f92a..ab5b87a8167 100644 --- a/drivers/hwmon/lm75.c +++ b/drivers/hwmon/lm75.c @@ -280,10 +280,49 @@ static int lm75_detect(struct i2c_client *new_client, return 0; } +#ifdef CONFIG_PM +static int lm75_suspend(struct device *dev) +{ + int status; + struct i2c_client *client = to_i2c_client(dev); + status = lm75_read_value(client, LM75_REG_CONF); + if (status < 0) { + dev_dbg(&client->dev, "Can't read config? %d\n", status); + return status; + } + status = status | LM75_SHUTDOWN; + lm75_write_value(client, LM75_REG_CONF, status); + return 0; +} + +static int lm75_resume(struct device *dev) +{ + int status; + struct i2c_client *client = to_i2c_client(dev); + status = lm75_read_value(client, LM75_REG_CONF); + if (status < 0) { + dev_dbg(&client->dev, "Can't read config? %d\n", status); + return status; + } + status = status & ~LM75_SHUTDOWN; + lm75_write_value(client, LM75_REG_CONF, status); + return 0; +} + +static const struct dev_pm_ops lm75_dev_pm_ops = { + .suspend = lm75_suspend, + .resume = lm75_resume, +}; +#define LM75_DEV_PM_OPS (&lm75_dev_pm_ops) +#else +#define LM75_DEV_PM_OPS NULL +#endif /* CONFIG_PM */ + static struct i2c_driver lm75_driver = { .class = I2C_CLASS_HWMON, .driver = { .name = "lm75", + .pm = LM75_DEV_PM_OPS, }, .probe = lm75_probe, .remove = lm75_remove, diff --git a/drivers/hwmon/lm75.h b/drivers/hwmon/lm75.h index 7c93454bb4e..e547a3eb4de 100644 --- a/drivers/hwmon/lm75.h +++ b/drivers/hwmon/lm75.h @@ -30,6 +30,7 @@ /* straight from the datasheet */ #define LM75_TEMP_MIN (-55000) #define LM75_TEMP_MAX 125000 +#define LM75_SHUTDOWN 0x01 /* TEMP: 0.001C/bit (-55C to +125C) REG: (0.5C/bit, two's complement) << 7 */ |