Messages in this thread | | | Date | Thu, 12 Sep 2013 06:31:05 -0700 | From | Guenter Roeck <> | Subject | Re: [PATCH v4 1/3] hwmon: (lm90) Add power control |
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On 09/12/2013 04:24 AM, Wei Ni wrote: > The device lm90 can be controlled by the vcc rail. > Adding the regulator support to power on/off the vcc rail. > Enable the "vcc" regulator before accessing the device. > > Signed-off-by: Wei Ni <wni@nvidia.com>
I still believe that you should update all .dts files referencing this driver to match the new requirement.
Guenter
> --- > drivers/hwmon/lm90.c | 20 ++++++++++++++++++++ > 1 file changed, 20 insertions(+) > > diff --git a/drivers/hwmon/lm90.c b/drivers/hwmon/lm90.c > index cdff742..f3f66d5 100644 > --- a/drivers/hwmon/lm90.c > +++ b/drivers/hwmon/lm90.c > @@ -89,6 +89,8 @@ > #include <linux/err.h> > #include <linux/mutex.h> > #include <linux/sysfs.h> > +#include <linux/regulator/consumer.h> > +#include <linux/delay.h> > > /* > * Addresses to scan > @@ -302,6 +304,7 @@ static const struct lm90_params lm90_params[] = { > struct lm90_data { > struct device *hwmon_dev; > struct mutex update_lock; > + struct regulator *lm90_reg; > char valid; /* zero until following fields are valid */ > unsigned long last_updated; /* in jiffies */ > int kind; > @@ -1397,8 +1400,20 @@ static int lm90_probe(struct i2c_client *client, > struct device *dev = &client->dev; > struct i2c_adapter *adapter = to_i2c_adapter(dev->parent); > struct lm90_data *data; > + struct regulator *reg; > int err; > > + reg = devm_regulator_get(dev, "vcc"); > + if (IS_ERR(reg)) > + return PTR_ERR(reg); > + > + err = regulator_enable(reg); > + if (err < 0) { > + dev_err(&client->dev, > + "Failed to enable regulator: %d\n", err); > + return err; > + } > + > data = devm_kzalloc(&client->dev, sizeof(struct lm90_data), GFP_KERNEL); > if (!data) > return -ENOMEM; > @@ -1406,6 +1421,8 @@ static int lm90_probe(struct i2c_client *client, > i2c_set_clientdata(client, data); > mutex_init(&data->update_lock); > > + data->lm90_reg = reg; > + > /* Set the device type */ > data->kind = id->driver_data; > if (data->kind == adm1032) { > @@ -1473,6 +1490,8 @@ exit_remove_files: > lm90_remove_files(client, data); > exit_restore: > lm90_restore_conf(client, data); > + regulator_disable(data->lm90_reg); > + > return err; > } > > @@ -1483,6 +1502,7 @@ static int lm90_remove(struct i2c_client *client) > hwmon_device_unregister(data->hwmon_dev); > lm90_remove_files(client, data); > lm90_restore_conf(client, data); > + regulator_disable(data->lm90_reg); > > return 0; > } >
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