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input: tsc2007: Power optimization in suspend/resume for TSC2007

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Disable/enable the voltage regulators during suspend/resume operations.

Change-Id: I0d10edc87d07c01327fa2258aae964d430cae7e3
CRs-Fixed: 258762
Signed-off-by: Anirudh Ghayal <aghayal@codeaurora.org>
This commit is contained in:
Anirudh Ghayal
2010-10-05 15:11:11 +05:30
committed by Stephen Boyd
parent efe979e255
commit 6f1bfa9f89
2 changed files with 31 additions and 1 deletions
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31
drivers/input/touchscreen/tsc2007.c
View File

@@ -87,6 +87,7 @@ struct tsc2007 {
int (*get_pendown_state)(void);
void (*clear_penirq)(void);
int (*power_shutdown)(bool);
};
static inline int tsc2007_xfer(struct tsc2007 *tsc, u8 cmd)
@@ -282,9 +283,9 @@ static void tsc2007_free_irq(struct tsc2007 *ts)
}
#ifdef CONFIG_PM
/* REVISIT: Changes for Power optimization */
static int tsc2007_suspend(struct device *dev)
{
int rc;
struct tsc2007 *ts = dev_get_drvdata(dev);
disable_irq(ts->irq);
@@ -292,13 +293,40 @@ static int tsc2007_suspend(struct device *dev)
if (cancel_delayed_work_sync(&ts->work))
enable_irq(ts->irq);
if (ts->power_shutdown) {
rc = ts->power_shutdown(true);
if (rc) {
pr_err("%s: Power off failed, suspend failed (%d)\n",
__func__, rc);
return rc;
}
}
return 0;
}
static int tsc2007_resume(struct device *dev)
{
int rc;
struct tsc2007 *ts = dev_get_drvdata(dev);
if (ts->power_shutdown) {
rc = ts->power_shutdown(false);
if (rc) {
pr_err("%s: Power on failed, resume failed (%d)\n",
__func__, rc);
return rc;
}
}
/* Prepare for touch readings - power down ADC and enable PENIRQ */
rc = tsc2007_xfer(ts, PWRDOWN);
if (rc < 0) {
pr_err("%s: TSC2007 enable failed\n", __func__);
ts->power_shutdown(true);
return rc;
}
enable_irq(ts->irq);
return 0;
@@ -350,6 +378,7 @@ static int __devinit tsc2007_probe(struct i2c_client *client,
ts->invert_y = pdata->invert_y;
ts->invert_z1 = pdata->invert_z1;
ts->invert_z2 = pdata->invert_z2;
ts->power_shutdown = pdata->power_shutdown;
snprintf(ts->phys, sizeof(ts->phys),
"%s/input0", dev_name(&client->dev));

1
include/linux/i2c/tsc2007.h
View File

@@ -24,6 +24,7 @@ struct tsc2007_platform_data {
interrupt source */
int (*init_platform_hw)(void);
void (*exit_platform_hw)(void);
int (*power_shutdown)(bool);
};
#endif