* [PATCH] max17042_battery: add suspend/resume hooks
@ 2012-03-26 20:53 Ramakrishna Pallala
2012-05-05 3:38 ` Anton Vorontsov
0 siblings, 1 reply; 2+ messages in thread
From: Ramakrishna Pallala @ 2012-03-26 20:53 UTC (permalink / raw)
To: linux-kernel; +Cc: Anton Vorontsov, Anton Vorontsov, Ramakrishna Pallala
This patch adds suspend/resume methods to the driver.
In suspend method irq line is disabled to avoid i2c
read/write errors from the interrupt handler as the
i2c bus itself could be in suspend state.
In resume function irq line will be re-enabled.
Signed-off-by: Ramakrishna Pallala <ramakrishna.pallala@intel.com>
---
drivers/power/max17042_battery.c | 41 ++++++++++++++++++++++++++++++++++++++
1 files changed, 41 insertions(+), 0 deletions(-)
diff --git a/drivers/power/max17042_battery.c b/drivers/power/max17042_battery.c
index d4868c5..cf5c855 100644
--- a/drivers/power/max17042_battery.c
+++ b/drivers/power/max17042_battery.c
@@ -28,6 +28,7 @@
#include <linux/i2c.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
+#include <linux/pm.h>
#include <linux/mod_devicetable.h>
#include <linux/power_supply.h>
#include <linux/power/max17042_battery.h>
@@ -728,6 +729,40 @@ static int __devexit max17042_remove(struct i2c_client *client)
return 0;
}
+#ifdef CONFIG_PM
+static int max17042_suspend(struct device *dev)
+{
+ struct max17042_chip *chip = dev_get_drvdata(dev);
+
+ /* disable the irq and enable irq_wake
+ * capability to the interrupt line.
+ */
+ if (chip->client->irq) {
+ disable_irq(chip->client->irq);
+ enable_irq_wake(chip->client->irq);
+ }
+
+ return 0;
+}
+
+static int max17042_resume(struct device *dev)
+{
+ struct max17042_chip *chip = dev_get_drvdata(dev);
+
+ if (chip->client->irq) {
+ disable_irq_wake(chip->client->irq);
+ enable_irq(chip->client->irq);
+ /* re-program the SOC thresholds to 1% change */
+ max17042_set_soc_threshold(chip, 1);
+ }
+
+ return 0;
+}
+#else
+#define max17042_suspend NULL
+#define max17042_resume NULL
+#endif
+
#ifdef CONFIG_OF
static const struct of_device_id max17042_dt_match[] = {
{ .compatible = "maxim,max17042" },
@@ -742,10 +777,16 @@ static const struct i2c_device_id max17042_id[] = {
};
MODULE_DEVICE_TABLE(i2c, max17042_id);
+static const struct dev_pm_ops max17042_pm_ops = {
+ .suspend = max17042_suspend,
+ .resume = max17042_resume,
+};
+
static struct i2c_driver max17042_i2c_driver = {
.driver = {
.name = "max17042",
.of_match_table = of_match_ptr(max17042_dt_match),
+ .pm = &max17042_pm_ops,
},
.probe = max17042_probe,
.remove = __devexit_p(max17042_remove),
--
1.7.0.4
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] max17042_battery: add suspend/resume hooks
2012-03-26 20:53 [PATCH] max17042_battery: add suspend/resume hooks Ramakrishna Pallala
@ 2012-05-05 3:38 ` Anton Vorontsov
0 siblings, 0 replies; 2+ messages in thread
From: Anton Vorontsov @ 2012-05-05 3:38 UTC (permalink / raw)
To: Ramakrishna Pallala; +Cc: linux-kernel
On Tue, Mar 27, 2012 at 02:23:40AM +0530, Ramakrishna Pallala wrote:
> This patch adds suspend/resume methods to the driver.
>
> In suspend method irq line is disabled to avoid i2c
> read/write errors from the interrupt handler as the
> i2c bus itself could be in suspend state.
> In resume function irq line will be re-enabled.
>
> Signed-off-by: Ramakrishna Pallala <ramakrishna.pallala@intel.com>
> ---
Applied, thank you!
[...]
> +#else
> +#define max17042_suspend NULL
> +#define max17042_resume NULL
> +#endif
> +
[...]
> +static const struct dev_pm_ops max17042_pm_ops = {
> + .suspend = max17042_suspend,
> + .resume = max17042_resume,
> +};
> +
> static struct i2c_driver max17042_i2c_driver = {
> .driver = {
> .name = "max17042",
> .of_match_table = of_match_ptr(max17042_dt_match),
> + .pm = &max17042_pm_ops,
It's better to hide dev_pm_ops under CONFIG_PM, and pass NULL in case
of !PM.
FYI, I applied this on top:
diff --git a/drivers/power/max17042_battery.c b/drivers/power/max17042_battery.c
index 07dee97..738648d 100644
--- a/drivers/power/max17042_battery.c
+++ b/drivers/power/max17042_battery.c
@@ -727,7 +727,8 @@ static int max17042_suspend(struct device *dev)
{
struct max17042_chip *chip = dev_get_drvdata(dev);
- /* disable the irq and enable irq_wake
+ /*
+ * disable the irq and enable irq_wake
* capability to the interrupt line.
*/
if (chip->client->irq) {
@@ -751,9 +752,15 @@ static int max17042_resume(struct device *dev)
return 0;
}
+
+static const struct dev_pm_ops max17042_pm_ops = {
+ .suspend = max17042_suspend,
+ .resume = max17042_resume,
+};
+
+#define MAX17042_PM_OPS (&max17042_pm_ops)
#else
-#define max17042_suspend NULL
-#define max17042_resume NULL
+#define MAX17042_PM_OPS NULL
#endif
#ifdef CONFIG_OF
@@ -770,16 +777,11 @@ static const struct i2c_device_id max17042_id[] = {
};
MODULE_DEVICE_TABLE(i2c, max17042_id);
-static const struct dev_pm_ops max17042_pm_ops = {
- .suspend = max17042_suspend,
- .resume = max17042_resume,
-};
-
static struct i2c_driver max17042_i2c_driver = {
.driver = {
.name = "max17042",
.of_match_table = of_match_ptr(max17042_dt_match),
- .pm = &max17042_pm_ops,
+ .pm = MAX17042_PM_OPS,
},
.probe = max17042_probe,
.remove = __devexit_p(max17042_remove),
^ permalink raw reply related [flat|nested] 2+ messages in thread
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