Input: ads7846 - add regulator support
The ADS7846/TSC2046 touchscreen controllers can (and usually are)
connected to various regulators for power, so add regulator support.
Valid regulator will now be required, so boards without complete
regulator setup should either disable regulator framework or enable
CONFIG_REGULATOR_DUMMY.
Signed-off-by: Grazvydas Ignotas <notasas@gmail.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
diff --git a/drivers/input/touchscreen/ads7846.c b/drivers/input/touchscreen/ads7846.c
index 52d2ca1..8b05d8e 100644
--- a/drivers/input/touchscreen/ads7846.c
+++ b/drivers/input/touchscreen/ads7846.c
@@ -27,6 +27,7 @@
#include <linux/gpio.h>
#include <linux/spi/spi.h>
#include <linux/spi/ads7846.h>
+#include <linux/regulator/consumer.h>
#include <asm/irq.h>
/*
@@ -85,6 +86,7 @@
char name[32];
struct spi_device *spi;
+ struct regulator *reg;
#if defined(CONFIG_HWMON) || defined(CONFIG_HWMON_MODULE)
struct attribute_group *attr_group;
@@ -788,6 +790,8 @@
}
}
+ regulator_disable(ts->reg);
+
/* we know the chip's in lowpower mode since we always
* leave it that way after every request
*/
@@ -799,6 +803,8 @@
if (!ts->disabled)
return;
+ regulator_enable(ts->reg);
+
ts->disabled = 0;
ts->irq_disabled = 0;
enable_irq(ts->spi->irq);
@@ -1139,6 +1145,19 @@
ts->last_msg = m;
+ ts->reg = regulator_get(&spi->dev, "vcc");
+ if (IS_ERR(ts->reg)) {
+ dev_err(&spi->dev, "unable to get regulator: %ld\n",
+ PTR_ERR(ts->reg));
+ goto err_free_gpio;
+ }
+
+ err = regulator_enable(ts->reg);
+ if (err) {
+ dev_err(&spi->dev, "unable to enable regulator: %d\n", err);
+ goto err_put_regulator;
+ }
+
if (request_irq(spi->irq, ads7846_irq, IRQF_TRIGGER_FALLING,
spi->dev.driver->name, ts)) {
dev_info(&spi->dev,
@@ -1148,7 +1167,7 @@
spi->dev.driver->name, ts);
if (err) {
dev_dbg(&spi->dev, "irq %d busy?\n", spi->irq);
- goto err_free_gpio;
+ goto err_disable_regulator;
}
}
@@ -1180,6 +1199,10 @@
ads784x_hwmon_unregister(spi, ts);
err_free_irq:
free_irq(spi->irq, ts);
+ err_disable_regulator:
+ regulator_disable(ts->reg);
+ err_put_regulator:
+ regulator_put(ts->reg);
err_free_gpio:
if (ts->gpio_pendown != -1)
gpio_free(ts->gpio_pendown);
@@ -1208,6 +1231,9 @@
/* suspend left the IRQ disabled */
enable_irq(ts->spi->irq);
+ regulator_disable(ts->reg);
+ regulator_put(ts->reg);
+
if (ts->gpio_pendown != -1)
gpio_free(ts->gpio_pendown);