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Date: Sun, 24 Oct 2010 16:03:15 +0200
From: Éric Piel <eric.piel@...mplin-utc.net>
To: Samu Onkalo <samu.p.onkalo@...ia.com>
CC: khali@...ux-fr.org, guenter.roeck@...csson.com, jic23@....ac.uk,
lm-sensors@...sensors.org, linux-i2c@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/12] hwmon: lis3: pm_runtime support
Op 22-10-10 13:57, Samu Onkalo schreef:
> Add pm_runtime support to lis3 core driver.
> Add pm_runtime support to lis3 i2c driver.
>
> spi and hp_accel drivers are not yet supported. Old always
> on functionality remains for those.
>
> For sysfs there is 5 second delay before turning off the
> chip to avoid long ramp up delay.
>
> Signed-off-by: Samu Onkalo<samu.p.onkalo@...ia.com>
Acked-by: Eric Piel <eric.piel@...mplin-utc.net>
> ---
> drivers/hwmon/lis3lv02d.c | 60 +++++++++++++++++++++++++++++++++++++++++
> drivers/hwmon/lis3lv02d.h | 1 +
> drivers/hwmon/lis3lv02d_i2c.c | 54 ++++++++++++++++++++++++++++---------
> 3 files changed, 102 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/hwmon/lis3lv02d.c b/drivers/hwmon/lis3lv02d.c
> index fc591ae..412ddc3 100644
> --- a/drivers/hwmon/lis3lv02d.c
> +++ b/drivers/hwmon/lis3lv02d.c
> @@ -34,6 +34,7 @@
> #include<linux/freezer.h>
> #include<linux/uaccess.h>
> #include<linux/miscdevice.h>
> +#include<linux/pm_runtime.h>
> #include<asm/atomic.h>
> #include "lis3lv02d.h"
>
> @@ -43,6 +44,9 @@
> #define MDPS_POLL_INTERVAL 50
> #define MDPS_POLL_MIN 0
> #define MDPS_POLL_MAX 2000
> +
> +#define LIS3_SYSFS_POWERDOWN_DELAY 5000 /* In milliseconds */
> +
> /*
> * The sensor can also generate interrupts (DRDY) but it's pretty pointless
> * because they are generated even if the data do not change. So it's better
> @@ -262,6 +266,18 @@ static void lis3lv02d_joystick_poll(struct input_polled_dev *pidev)
> mutex_unlock(&lis3_dev.mutex);
> }
>
> +static void lis3lv02d_joystick_open(struct input_polled_dev *pidev)
> +{
> + if (lis3_dev.pm_dev)
> + pm_runtime_get_sync(lis3_dev.pm_dev);
> +}
> +
> +static void lis3lv02d_joystick_close(struct input_polled_dev *pidev)
> +{
> + if (lis3_dev.pm_dev)
> + pm_runtime_put(lis3_dev.pm_dev);
> +}
> +
> static irqreturn_t lis302dl_interrupt(int irq, void *dummy)
> {
> if (!test_bit(0,&lis3_dev.misc_opened))
> @@ -356,6 +372,9 @@ static int lis3lv02d_misc_open(struct inode *inode, struct file *file)
> if (test_and_set_bit(0,&lis3_dev.misc_opened))
> return -EBUSY; /* already open */
>
> + if (lis3_dev.pm_dev)
> + pm_runtime_get_sync(lis3_dev.pm_dev);
> +
> atomic_set(&lis3_dev.count, 0);
> return 0;
> }
> @@ -364,6 +383,8 @@ static int lis3lv02d_misc_release(struct inode *inode, struct file *file)
> {
> fasync_helper(-1, file, 0,&lis3_dev.async_queue);
> clear_bit(0,&lis3_dev.misc_opened); /* release the device */
> + if (lis3_dev.pm_dev)
> + pm_runtime_put(lis3_dev.pm_dev);
> return 0;
> }
>
> @@ -460,6 +481,8 @@ int lis3lv02d_joystick_enable(void)
> return -ENOMEM;
>
> lis3_dev.idev->poll = lis3lv02d_joystick_poll;
> + lis3_dev.idev->open = lis3lv02d_joystick_open;
> + lis3_dev.idev->close = lis3lv02d_joystick_close;
> lis3_dev.idev->poll_interval = MDPS_POLL_INTERVAL;
> lis3_dev.idev->poll_interval_min = MDPS_POLL_MIN;
> lis3_dev.idev->poll_interval_max = MDPS_POLL_MAX;
> @@ -512,12 +535,30 @@ void lis3lv02d_joystick_disable(void)
> EXPORT_SYMBOL_GPL(lis3lv02d_joystick_disable);
>
> /* Sysfs stuff */
> +static void lis3lv02d_sysfs_poweron(struct lis3lv02d *lis3)
> +{
> + /*
> + * SYSFS functions are fast visitors so put-call
> + * immediately after the get-call. However, keep
> + * chip running for a while and schedule delayed
> + * suspend. This way periodic sysfs calls doesn't
> + * suffer from relatively long power up time.
> + */
> +
> + if (lis3->pm_dev) {
> + pm_runtime_get_sync(lis3->pm_dev);
> + pm_runtime_put_noidle(lis3->pm_dev);
> + pm_schedule_suspend(lis3->pm_dev, LIS3_SYSFS_POWERDOWN_DELAY);
> + }
> +}
> +
> static ssize_t lis3lv02d_selftest_show(struct device *dev,
> struct device_attribute *attr, char *buf)
> {
> int result;
> s16 values[3];
>
> + lis3lv02d_sysfs_poweron(&lis3_dev);
> result = lis3lv02d_selftest(&lis3_dev, values);
> return sprintf(buf, "%s %d %d %d\n", result == 0 ? "OK" : "FAIL",
> values[0], values[1], values[2]);
> @@ -528,6 +569,7 @@ static ssize_t lis3lv02d_position_show(struct device *dev,
> {
> int x, y, z;
>
> + lis3lv02d_sysfs_poweron(&lis3_dev);
> mutex_lock(&lis3_dev.mutex);
> lis3lv02d_get_xyz(&lis3_dev,&x,&y,&z);
> mutex_unlock(&lis3_dev.mutex);
> @@ -537,6 +579,7 @@ static ssize_t lis3lv02d_position_show(struct device *dev,
> static ssize_t lis3lv02d_rate_show(struct device *dev,
> struct device_attribute *attr, char *buf)
> {
> + lis3lv02d_sysfs_poweron(&lis3_dev);
> return sprintf(buf, "%d\n", lis3lv02d_get_odr());
> }
>
> @@ -549,6 +592,7 @@ static ssize_t lis3lv02d_rate_set(struct device *dev,
> if (strict_strtoul(buf, 0,&rate))
> return -EINVAL;
>
> + lis3lv02d_sysfs_poweron(&lis3_dev);
> if (lis3lv02d_set_odr(rate))
> return -EINVAL;
>
> @@ -585,6 +629,17 @@ int lis3lv02d_remove_fs(struct lis3lv02d *lis3)
> {
> sysfs_remove_group(&lis3->pdev->dev.kobj,&lis3lv02d_attribute_group);
> platform_device_unregister(lis3->pdev);
> + if (lis3->pm_dev) {
> + /* Barrier after the sysfs remove */
> + pm_runtime_barrier(lis3->pm_dev);
> +
> + /* SYSFS may have left chip running. Turn off if necessary */
> + if (!pm_runtime_suspended(lis3->pm_dev))
> + lis3lv02d_poweroff(&lis3_dev);
> +
> + pm_runtime_disable(lis3->pm_dev);
> + pm_runtime_set_suspended(lis3->pm_dev);
> + }
> return 0;
> }
> EXPORT_SYMBOL_GPL(lis3lv02d_remove_fs);
> @@ -685,6 +740,11 @@ int lis3lv02d_init_device(struct lis3lv02d *dev)
> lis3lv02d_add_fs(dev);
> lis3lv02d_poweron(dev);
>
> + if (dev->pm_dev) {
> + pm_runtime_set_active(dev->pm_dev);
> + pm_runtime_enable(dev->pm_dev);
> + }
> +
> if (lis3lv02d_joystick_enable())
> printk(KERN_ERR DRIVER_NAME ": joystick initialization failed\n");
>
> diff --git a/drivers/hwmon/lis3lv02d.h b/drivers/hwmon/lis3lv02d.h
> index 8540913..3e8a208 100644
> --- a/drivers/hwmon/lis3lv02d.h
> +++ b/drivers/hwmon/lis3lv02d.h
> @@ -214,6 +214,7 @@ struct axis_conversion {
>
> struct lis3lv02d {
> void *bus_priv; /* used by the bus layer only */
> + struct device *pm_dev; /* for pm_runtime purposes */
> int (*init) (struct lis3lv02d *lis3);
> int (*write) (struct lis3lv02d *lis3, int reg, u8 val);
> int (*read) (struct lis3lv02d *lis3, int reg, u8 *ret);
> diff --git a/drivers/hwmon/lis3lv02d_i2c.c b/drivers/hwmon/lis3lv02d_i2c.c
> index 8e5933b..6e965d7 100644
> --- a/drivers/hwmon/lis3lv02d_i2c.c
> +++ b/drivers/hwmon/lis3lv02d_i2c.c
> @@ -29,6 +29,7 @@
> #include<linux/init.h>
> #include<linux/err.h>
> #include<linux/i2c.h>
> +#include<linux/pm_runtime.h>
> #include "lis3lv02d.h"
>
> #define DRV_NAME "lis3lv02d_i2c"
> @@ -95,6 +96,7 @@ static int __devinit lis3lv02d_i2c_probe(struct i2c_client *client,
> lis3_dev.write = lis3_i2c_write;
> lis3_dev.irq = client->irq;
> lis3_dev.ac = lis3lv02d_axis_map;
> + lis3_dev.pm_dev =&client->dev;
>
> i2c_set_clientdata(client,&lis3_dev);
> ret = lis3lv02d_init_device(&lis3_dev);
> @@ -104,21 +106,20 @@ fail:
>
> static int __devexit lis3lv02d_i2c_remove(struct i2c_client *client)
> {
> - struct lis3lv02d *lis3 = i2c_get_clientdata(client);
> struct lis3lv02d_platform_data *pdata = client->dev.platform_data;
>
> if (pdata&& pdata->release_resources)
> pdata->release_resources();
>
> lis3lv02d_joystick_disable();
> - lis3lv02d_poweroff(lis3);
>
> return lis3lv02d_remove_fs(&lis3_dev);
> }
>
> #ifdef CONFIG_PM
> -static int lis3lv02d_i2c_suspend(struct i2c_client *client, pm_message_t mesg)
> +static int lis3lv02d_i2c_suspend(struct device *dev)
> {
> + struct i2c_client *client = container_of(dev, struct i2c_client, dev);
> struct lis3lv02d *lis3 = i2c_get_clientdata(client);
>
> if (!lis3->pdata || !lis3->pdata->wakeup_flags)
> @@ -126,18 +127,21 @@ static int lis3lv02d_i2c_suspend(struct i2c_client *client, pm_message_t mesg)
> return 0;
> }
>
> -static int lis3lv02d_i2c_resume(struct i2c_client *client)
> +static int lis3lv02d_i2c_resume(struct device *dev)
> {
> + struct i2c_client *client = container_of(dev, struct i2c_client, dev);
> struct lis3lv02d *lis3 = i2c_get_clientdata(client);
>
> - if (!lis3->pdata || !lis3->pdata->wakeup_flags)
> + /*
> + * pm_runtime documentation says that devices should always
> + * be powered on at resume. Pm_runtime turns them off after system
> + * wide resume is complete.
> + */
> + if (!lis3->pdata || !lis3->pdata->wakeup_flags ||
> + pm_runtime_suspended(dev))
> lis3lv02d_poweron(lis3);
> - return 0;
> -}
>
> -static void lis3lv02d_i2c_shutdown(struct i2c_client *client)
> -{
> - lis3lv02d_i2c_suspend(client, PMSG_SUSPEND);
> + return 0;
> }
> #else
> #define lis3lv02d_i2c_suspend NULL
> @@ -145,6 +149,24 @@ static void lis3lv02d_i2c_shutdown(struct i2c_client *client)
> #define lis3lv02d_i2c_shutdown NULL
> #endif
>
> +static int lis3_i2c_runtime_suspend(struct device *dev)
> +{
> + struct i2c_client *client = container_of(dev, struct i2c_client, dev);
> + struct lis3lv02d *lis3 = i2c_get_clientdata(client);
> +
> + lis3lv02d_poweroff(lis3);
> + return 0;
> +}
> +
> +static int lis3_i2c_runtime_resume(struct device *dev)
> +{
> + struct i2c_client *client = container_of(dev, struct i2c_client, dev);
> + struct lis3lv02d *lis3 = i2c_get_clientdata(client);
> +
> + lis3lv02d_poweron(lis3);
> + return 0;
> +}
> +
> static const struct i2c_device_id lis3lv02d_id[] = {
> {"lis3lv02d", 0 },
> {}
> @@ -152,14 +174,20 @@ static const struct i2c_device_id lis3lv02d_id[] = {
>
> MODULE_DEVICE_TABLE(i2c, lis3lv02d_id);
>
> +static const struct dev_pm_ops lis3_pm_ops = {
> + SET_SYSTEM_SLEEP_PM_OPS(lis3lv02d_i2c_suspend,
> + lis3lv02d_i2c_resume)
> + SET_RUNTIME_PM_OPS(lis3_i2c_runtime_suspend,
> + lis3_i2c_runtime_resume,
> + NULL)
> +};
> +
> static struct i2c_driver lis3lv02d_i2c_driver = {
> .driver = {
> .name = DRV_NAME,
> .owner = THIS_MODULE,
> + .pm =&lis3_pm_ops,
> },
> - .suspend = lis3lv02d_i2c_suspend,
> - .shutdown = lis3lv02d_i2c_shutdown,
> - .resume = lis3lv02d_i2c_resume,
> .probe = lis3lv02d_i2c_probe,
> .remove = __devexit_p(lis3lv02d_i2c_remove),
> .id_table = lis3lv02d_id,
--
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