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Date: Mon, 26 Jan 2015 19:08:11 +0000
From: Jonathan Cameron <jic23@...nel.org>
To: Irina Tirdea <irina.tirdea@...el.com>, linux-iio@...r.kernel.org
CC: linux-kernel@...r.kernel.org, Vlad Dogaru <vlad.dogaru@...el.com>,
Daniel Baluta <daniel.baluta@...el.com>,
Hartmut Knaack <knaack.h@....de>,
Lars-Peter Clausen <lars@...afoo.de>,
Peter Meerwald <pmeerw@...erw.net>
Subject: Re: [PATCH v2 08/10] iio: accel: mma9551: Add runtime pm support
On 11/01/15 19:10, Irina Tirdea wrote:
> Add support for runtime pm to reduce the power consumed by the device
> when not used.
>
> If CONFIG_PM is not enabled, the device will be powered on at
> init and only powered off on system suspend.
>
> If CONFIG_PM is enabled, runtime pm autosuspend is used:
> - for raw reads will keep the device on for a specified time
> - for events it will keep the device on as long as we have at least
> one event active
>
> Signed-off-by: Irina Tirdea <irina.tirdea@...el.com>
> Reviewed-by: Vlad Dogaru <vlad.dogaru@...el.com>
Looks good.
Applied to the togreg branch of iio.git
(at least we are driving down the size of the patch set for the next
revision!)
Jonathan
> ---
> drivers/iio/accel/mma9551.c | 162 +++++++++++++++++++++++++++++++++++++-------
> 1 file changed, 139 insertions(+), 23 deletions(-)
>
> diff --git a/drivers/iio/accel/mma9551.c b/drivers/iio/accel/mma9551.c
> index 6563e26..f1a5a06 100644
> --- a/drivers/iio/accel/mma9551.c
> +++ b/drivers/iio/accel/mma9551.c
> @@ -22,6 +22,7 @@
> #include <linux/iio/iio.h>
> #include <linux/iio/sysfs.h>
> #include <linux/iio/events.h>
> +#include <linux/pm_runtime.h>
>
> #define MMA9551_DRV_NAME "mma9551"
> #define MMA9551_IRQ_NAME "mma9551_event"
> @@ -71,6 +72,7 @@ enum mma9551_gpio_pin {
> /* Sleep/Wake application */
> #define MMA9551_SLEEP_CFG 0x06
> #define MMA9551_SLEEP_CFG_SNCEN BIT(0)
> +#define MMA9551_SLEEP_CFG_FLEEN BIT(1)
> #define MMA9551_SLEEP_CFG_SCHEN BIT(2)
>
> /* AFE application */
> @@ -114,6 +116,9 @@ enum mma9551_tilt_axis {
> #define MMA9551_I2C_READ_RETRIES 5
> #define MMA9551_I2C_READ_DELAY 50 /* us */
>
> +#define MMA9551_DEFAULT_SAMPLE_RATE 122 /* Hz */
> +#define MMA9551_AUTO_SUSPEND_DELAY_MS 2000
> +
> struct mma9551_mbox_request {
> u8 start_mbox; /* Always 0. */
> u8 app_id;
> @@ -387,16 +392,55 @@ static int mma9551_read_version(struct i2c_client *client)
> }
>
> /*
> + * Power on chip and enable doze mode.
> * Use 'false' as the second parameter to cause the device to enter
> * sleep.
> */
> -static int mma9551_set_device_state(struct i2c_client *client,
> - bool enable)
> +static int mma9551_set_device_state(struct i2c_client *client, bool enable)
> {
> return mma9551_update_config_bits(client, MMA9551_APPID_SLEEP_WAKE,
> MMA9551_SLEEP_CFG,
> - MMA9551_SLEEP_CFG_SNCEN,
> - enable ? 0 : MMA9551_SLEEP_CFG_SNCEN);
> + MMA9551_SLEEP_CFG_SNCEN |
> + MMA9551_SLEEP_CFG_FLEEN |
> + MMA9551_SLEEP_CFG_SCHEN,
> + enable ? MMA9551_SLEEP_CFG_SCHEN |
> + MMA9551_SLEEP_CFG_FLEEN :
> + MMA9551_SLEEP_CFG_SNCEN);
> +}
> +
> +static int mma9551_set_power_state(struct i2c_client *client, bool on)
> +{
> +#ifdef CONFIG_PM
> + int ret;
> +
> + if (on)
> + ret = pm_runtime_get_sync(&client->dev);
> + else {
> + pm_runtime_mark_last_busy(&client->dev);
> + ret = pm_runtime_put_autosuspend(&client->dev);
> + }
> +
> + if (ret < 0) {
> + dev_err(&client->dev,
> + "failed to change power state to %d\n", on);
> + if (on)
> + pm_runtime_put_noidle(&client->dev);
> +
> + return ret;
> + }
> +#endif
> +
> + return 0;
> +}
> +
> +static void mma9551_sleep(int freq)
> +{
> + int sleep_val = 1000 / freq;
> +
> + if (sleep_val < 20)
> + usleep_range(sleep_val * 1000, 20000);
> + else
> + msleep_interruptible(sleep_val);
> }
>
> static int mma9551_read_incli_chan(struct i2c_client *client,
> @@ -424,15 +468,19 @@ static int mma9551_read_incli_chan(struct i2c_client *client,
> return -EINVAL;
> }
>
> + ret = mma9551_set_power_state(client, true);
> + if (ret < 0)
> + return ret;
> +
> ret = mma9551_read_status_byte(client, MMA9551_APPID_TILT,
> reg_addr, &angle);
> if (ret < 0)
> - return ret;
> + goto out_poweroff;
>
> ret = mma9551_read_status_byte(client, MMA9551_APPID_TILT,
> MMA9551_TILT_QUAD_REG, &quadrant);
> if (ret < 0)
> - return ret;
> + goto out_poweroff;
>
> angle &= ~MMA9551_TILT_ANGFLG;
> quadrant = (quadrant >> quad_shift) & 0x03;
> @@ -442,7 +490,11 @@ static int mma9551_read_incli_chan(struct i2c_client *client,
> else
> *val = angle + 90 * quadrant;
>
> - return IIO_VAL_INT;
> + ret = IIO_VAL_INT;
> +
> +out_poweroff:
> + mma9551_set_power_state(client, false);
> + return ret;
> }
>
> static int mma9551_read_accel_chan(struct i2c_client *client,
> @@ -467,14 +519,22 @@ static int mma9551_read_accel_chan(struct i2c_client *client,
> return -EINVAL;
> }
>
> + ret = mma9551_set_power_state(client, true);
> + if (ret < 0)
> + return ret;
> +
> ret = mma9551_read_status_word(client, MMA9551_APPID_AFE,
> reg_addr, &raw_accel);
> if (ret < 0)
> - return ret;
> + goto out_poweroff;
>
> *val = raw_accel;
>
> - return IIO_VAL_INT;
> + ret = IIO_VAL_INT;
> +
> +out_poweroff:
> + mma9551_set_power_state(client, false);
> + return ret;
> }
>
> static int mma9551_read_raw(struct iio_dev *indio_dev,
> @@ -556,6 +616,10 @@ static int mma9551_config_incli_event(struct iio_dev *indio_dev,
> MMA9551_APPID_NONE, 0, 0);
> if (ret < 0)
> return ret;
> +
> + ret = mma9551_set_power_state(data->client, false);
> + if (ret < 0)
> + return ret;
> } else {
> int bitnum;
>
> @@ -574,11 +638,18 @@ static int mma9551_config_incli_event(struct iio_dev *indio_dev,
> return -EINVAL;
> }
>
> +
Trivial but one blank line here is enough...
> + ret = mma9551_set_power_state(data->client, true);
> + if (ret < 0)
> + return ret;
> +
> ret = mma9551_gpio_config(data->client,
> (enum mma9551_gpio_pin)mma_axis,
> MMA9551_APPID_TILT, bitnum, 0);
> - if (ret < 0)
> + if (ret < 0) {
> + mma9551_set_power_state(data->client, false);
> return ret;
> + }
> }
>
> data->event_enabled[mma_axis] = state;
> @@ -771,12 +842,7 @@ static int mma9551_init(struct mma9551_data *data)
> if (ret)
> return ret;
>
> - /* Power on chip and enable doze mode. */
> - return mma9551_update_config_bits(data->client,
> - MMA9551_APPID_SLEEP_WAKE,
> - MMA9551_SLEEP_CFG,
> - MMA9551_SLEEP_CFG_SCHEN | MMA9551_SLEEP_CFG_SNCEN,
> - MMA9551_SLEEP_CFG_SCHEN);
> + return mma9551_set_device_state(data->client, true);
> }
>
> static int mma9551_gpio_probe(struct iio_dev *indio_dev)
> @@ -869,8 +935,19 @@ static int mma9551_probe(struct i2c_client *client,
> goto out_poweroff;
> }
>
> + ret = pm_runtime_set_active(&client->dev);
> + if (ret < 0)
> + goto out_iio_unregister;
> +
> + pm_runtime_enable(&client->dev);
> + pm_runtime_set_autosuspend_delay(&client->dev,
> + MMA9551_AUTO_SUSPEND_DELAY_MS);
> + pm_runtime_use_autosuspend(&client->dev);
> +
> return 0;
>
> +out_iio_unregister:
> + iio_device_unregister(indio_dev);
> out_poweroff:
> mma9551_set_device_state(client, false);
>
> @@ -882,6 +959,10 @@ static int mma9551_remove(struct i2c_client *client)
> struct iio_dev *indio_dev = i2c_get_clientdata(client);
> struct mma9551_data *data = iio_priv(indio_dev);
>
> + pm_runtime_disable(&client->dev);
> + pm_runtime_set_suspended(&client->dev);
> + pm_runtime_put_noidle(&client->dev);
> +
> iio_device_unregister(indio_dev);
> mutex_lock(&data->mutex);
> mma9551_set_device_state(data->client, false);
> @@ -890,37 +971,72 @@ static int mma9551_remove(struct i2c_client *client)
> return 0;
> }
>
> +#ifdef CONFIG_PM
> +static int mma9551_runtime_suspend(struct device *dev)
> +{
> + struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
> + struct mma9551_data *data = iio_priv(indio_dev);
> + int ret;
> +
> + mutex_lock(&data->mutex);
> + ret = mma9551_set_device_state(data->client, false);
> + mutex_unlock(&data->mutex);
> + if (ret < 0) {
> + dev_err(&data->client->dev, "powering off device failed\n");
> + return -EAGAIN;
> + }
> +
> + return 0;
> +}
> +
> +static int mma9551_runtime_resume(struct device *dev)
> +{
> + struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
> + struct mma9551_data *data = iio_priv(indio_dev);
> + int ret;
> +
> + ret = mma9551_set_device_state(data->client, true);
> + if (ret < 0)
> + return ret;
> +
> + mma9551_sleep(MMA9551_DEFAULT_SAMPLE_RATE);
> +
> + return 0;
> +}
> +#endif
> +
> #ifdef CONFIG_PM_SLEEP
> static int mma9551_suspend(struct device *dev)
> {
> struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
> struct mma9551_data *data = iio_priv(indio_dev);
> + int ret;
>
> mutex_lock(&data->mutex);
> - mma9551_set_device_state(data->client, false);
> + ret = mma9551_set_device_state(data->client, false);
> mutex_unlock(&data->mutex);
>
> - return 0;
> + return ret;
> }
>
> static int mma9551_resume(struct device *dev)
> {
> struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
> struct mma9551_data *data = iio_priv(indio_dev);
> + int ret;
>
> mutex_lock(&data->mutex);
> - mma9551_set_device_state(data->client, true);
> + ret = mma9551_set_device_state(data->client, true);
> mutex_unlock(&data->mutex);
>
> - return 0;
> + return ret;
> }
> -#else
> -#define mma9551_suspend NULL
> -#define mma9551_resume NULL
> #endif
>
> static const struct dev_pm_ops mma9551_pm_ops = {
> SET_SYSTEM_SLEEP_PM_OPS(mma9551_suspend, mma9551_resume)
> + SET_RUNTIME_PM_OPS(mma9551_runtime_suspend,
> + mma9551_runtime_resume, NULL)
> };
>
> static const struct acpi_device_id mma9551_acpi_match[] = {
>
--
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