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Date: Sun, 19 Apr 2015 16:57:23 +0100
From: Jonathan Cameron <jic23@kernel.org>
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To: Tiberiu Breana <tiberiu.a.breana@intel.com>,
	linux-iio@vger.kernel.org
Subject: Re: [PATCH 2/3] iio: light: Add Power Management for STK3310
References: <1429003962-13922-1-git-send-email-tiberiu.a.breana@intel.com> <1429003962-13922-3-git-send-email-tiberiu.a.breana@intel.com>
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On 14/04/15 10:32, Tiberiu Breana wrote:
> Added suspend & resume functions to the stk3310 driver.
> 
> Signed-off-by: Tiberiu Breana <tiberiu.a.breana@intel.com>
Whilst we are here. It's always nice to have a series broken up into
bite sized chunks, but I have no objection to having things like this
in the main patch!

couple of little bits inline.

> ---
>  drivers/iio/light/stk3310.c | 41 +++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 41 insertions(+)
> 
> diff --git a/drivers/iio/light/stk3310.c b/drivers/iio/light/stk3310.c
> index 5bcf5a0..bc09304 100644
> --- a/drivers/iio/light/stk3310.c
> +++ b/drivers/iio/light/stk3310.c
> @@ -82,6 +82,8 @@ enum stk3310_config_type {
>  struct stk3310_data {
>  	struct i2c_client *client;
>  	struct mutex lock;
> +	int als_enabled;
> +	int ps_enabled;
bool
>  	/* Cache table for storing config values */
>  	int cache[2][STK3310_TYPE_COUNT];
>  };
> @@ -385,6 +387,12 @@ static int stk3310_set_state(struct stk3310_data *data, u8 state)
>  
>  	mutex_unlock(&data->lock);
>  
> +	/* Don't reset the 'enabled' flags if we're going in standby */
> +	if (state != STK3310_STATE_STANDBY) {
> +		data->ps_enabled = (state & 0x01) ? 1 : 0;
data->ps_enabled = !!(state & 0x01);
> +		data->als_enabled = (state & 0x02) ? 1 : 0;
> +	}
> +
>  	return ret;
>  }
>  
> @@ -461,6 +469,38 @@ static int stk3310_remove(struct i2c_client *client)
>  	return stk3310_set_state(data, STK3310_STATE_STANDBY);
>  }
>  
> +#ifdef CONFIG_PM_SLEEP
> +static int stk3310_suspend(struct device *dev)
> +{
> +	struct stk3310_data *data;
> +
> +	data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
> +
> +	return stk3310_set_state(data, STK3310_STATE_STANDBY);
> +}
> +
> +static int stk3310_resume(struct device *dev)
> +{
> +	int state;
= 0;
> +	struct stk3310_data *data;
> +
> +	data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
> +	state = 0;
> +	if (data->ps_enabled)
> +		state |= STK3310_STATE_EN_PS;
> +	if (data->als_enabled)
> +		state |= STK3310_STATE_EN_ALS;
> +
> +	return stk3310_set_state(data, state);
> +}
> +
> +static SIMPLE_DEV_PM_OPS(stk3310_pm_ops, stk3310_suspend, stk3310_resume);
> +
> +#define STK3310_PM_OPS (&stk3310_pm_ops)
> +#else
> +#define STK3310_PM_OPS NULL
> +#endif
> +
>  static const struct i2c_device_id stk3310_i2c_id[] = {
>  	{"STK3310", 0},
>  	{"STK3311", 0},
> @@ -478,6 +518,7 @@ MODULE_DEVICE_TABLE(acpi, stk3310_acpi_id);
>  static struct i2c_driver stk3310_driver = {
>  	.driver = {
>  		.name = "stk3310",
> +		.pm = STK3310_PM_OPS,
>  		.acpi_match_table = ACPI_PTR(stk3310_acpi_id),
>  	},
>  	.probe =            stk3310_probe,
>