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input: touchscreen: reduce lpm current of avdd reg for ITE tech

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Reduce lpm current of avdd regulator for ITE tech touch controller
to save power dissipation in lpm state.

Change-Id: I4b0c532096f1555561ad33e937cb947e85f987cd
Signed-off-by: Shantanu Jain <shjain@codeaurora.org>
This commit is contained in:
Shantanu Jain 2015-11-27 12:34:38 +05:30 • committed by Abinaya P
parent 7233392578
commit 0e3bb05bcb
2 changed files with 29 additions and 0 deletions
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2
Documentation/devicetree/bindings/input/touchscreen/it7258_ts_i2c.txt
View file

@ -45,6 +45,7 @@ Optional properties:
- ite,low-reset : boolean, if the controller needs low-state of the reset gpio while - ite,low-reset : boolean, if the controller needs low-state of the reset gpio while
initializing, and reset gpio should be made as high-state to reset the initializing, and reset gpio should be made as high-state to reset the
controller. It means the controller needs "active-high" reset gpio. controller. It means the controller needs "active-high" reset gpio.
- ite,avdd-lpm-cur : avdd lpm current value(mA) in suspend state.
Required properties palm-detect-en feature: Required properties palm-detect-en feature:
- ite,palm-detect-keycode : The keycode that is required to be sent when - ite,palm-detect-keycode : The keycode that is required to be sent when
@ -76,5 +77,6 @@ Example:
ite,num-fingers = <2>; ite,num-fingers = <2>;
ite,reset-delay = <20>; ite,reset-delay = <20>;
ite,low-reset; ite,low-reset;
ite,vdd-lpm-cur = <3000>;
}; };
}; };

27
drivers/input/touchscreen/it7258_ts_i2c.c
View file

@ -168,6 +168,7 @@ struct IT7260_ts_platform_data {
unsigned int disp_maxy; unsigned int disp_maxy;
unsigned num_of_fingers; unsigned num_of_fingers;
unsigned int reset_delay; unsigned int reset_delay;
unsigned int avdd_lpm_cur;
bool low_reset; bool low_reset;
}; };
@ -1493,6 +1494,14 @@ static int IT7260_parse_dt(struct device *dev,
return rc; return rc;
} }
rc = of_property_read_u32(np, "ite,avdd-lpm-cur", &temp_val);
if (!rc) {
pdata->avdd_lpm_cur = temp_val;
} else if (rc && (rc != -EINVAL)) {
dev_err(dev, "Unable to read avdd lpm current value %d\n", rc);
return rc;
}
pdata->low_reset = of_property_read_bool(np, "ite,low-reset"); pdata->low_reset = of_property_read_bool(np, "ite,low-reset");
rc = IT7260_get_dt_coords(dev, "ite,display-coords", pdata); rc = IT7260_get_dt_coords(dev, "ite,display-coords", pdata);
@ -1872,6 +1881,15 @@ static int IT7260_ts_resume(struct device *dev)
if (device_may_wakeup(dev)) { if (device_may_wakeup(dev)) {
if (gl_ts->device_needs_wakeup) { if (gl_ts->device_needs_wakeup) {
/* Set active current for the avdd regulator */
if (gl_ts->pdata->avdd_lpm_cur) {
retval = reg_set_optimum_mode_check(gl_ts->avdd,
IT_I2C_ACTIVE_LOAD_UA);
if (retval < 0)
dev_err(dev, "Regulator avdd set_opt failed at resume rc=%d\n",
retval);
}
gl_ts->device_needs_wakeup = false; gl_ts->device_needs_wakeup = false;
disable_irq_wake(gl_ts->client->irq); disable_irq_wake(gl_ts->client->irq);
} }
@ -1910,6 +1928,15 @@ static int IT7260_ts_suspend(struct device *dev)
/* put the device in low power idle mode */ /* put the device in low power idle mode */
IT7260_ts_chipLowPowerMode(PWR_CTL_LOW_POWER_MODE); IT7260_ts_chipLowPowerMode(PWR_CTL_LOW_POWER_MODE);
/* Set lpm current for avdd regulator */
if (gl_ts->pdata->avdd_lpm_cur) {
retval = reg_set_optimum_mode_check(gl_ts->avdd,
gl_ts->pdata->avdd_lpm_cur);
if (retval < 0)
dev_err(dev, "Regulator avdd set_opt failed at suspend rc=%d\n",
retval);
}
gl_ts->device_needs_wakeup = true; gl_ts->device_needs_wakeup = true;
enable_irq_wake(gl_ts->client->irq); enable_irq_wake(gl_ts->client->irq);
} }