input: zforce: add regulator handling
From: Heiko Stuebner <heiko@...> Date: Tue, 22 Apr 2014 19:04:52 +0200
Commit-Message
From: Heiko Stuebner <heiko.stuebner@...> It's possible that the controller has an individually switchable power supply. Therefore add support to control a supplying regulator. As this is not always the case, the regulator is requested as optional. Signed-off-by: Heiko Stuebner <heiko.stuebner@...>
Patch-Comment
.../bindings/input/touchscreen/zforce_ts.txt | 4 +++ drivers/input/touchscreen/zforce_ts.c | 30 ++++++++++++++++++++++ 2 files changed, 34 insertions(+)
Statistics
- 34 lines added
- 0 lines removed
Changes
------ Documentation/devicetree/bindings/input/touchscreen/zforce_ts.txt -------
index 2faf1f1..80c37df 100644
@@ -9,6 +9,9 @@ Required properties:
- x-size: horizontal resolution of touchscreen
- y-size: vertical resolution of touchscreen
+Optional properties:
+- vdd-supply: Regulator controlling the controller supply
+
Example:
i2c@00000000 {
@@ -18,6 +21,7 @@ Example:
compatible = "neonode,zforce";
reg = <0x50>;
interrupts = <2 0>;
+ vdd-supply = <®_zforce_vdd>;
gpios = <&gpio5 6 0>, /* INT */
<&gpio5 9 0>; /* RST */
-------------------- drivers/input/touchscreen/zforce_ts.c ---------------------
index 01d30ce..39ca962 100644
@@ -29,6 +29,8 @@
#include <linux/sysfs.h>
#include <linux/input/mt.h>
#include <linux/platform_data/zforce_ts.h>
+#include <linux/regulator/consumer.h>
+#include <linux/delay.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
@@ -117,6 +119,8 @@ struct zforce_ts {
const struct zforce_ts_platdata *pdata;
char phys[32];
+ struct regulator *reg_vdd;
+
bool suspending;
bool suspended;
bool boot_complete;
@@ -690,6 +694,11 @@ static void zforce_reset(void *data)
struct zforce_ts *ts = data;
gpio_set_value(ts->pdata->gpio_rst, 0);
+
+ udelay(10);
+
+ if (!IS_ERR(ts->reg_vdd))
+ regulator_disable(ts->reg_vdd);
}
static struct zforce_ts_platdata *zforce_parse_dt(struct device *dev)
@@ -765,10 +774,31 @@ static int zforce_probe(struct i2c_client *client,
return ret;
}
+ ts->reg_vdd = devm_regulator_get_optional(&client->dev, "vdd");
+ if (IS_ERR(ts->reg_vdd) && PTR_ERR(ts->reg_vdd) == -EPROBE_DEFER)
+ return PTR_ERR(ts->reg_vdd);
+
+ if (!IS_ERR(ts->reg_vdd)) {
+ ret = regulator_enable(ts->reg_vdd);
+ if (ret)
+ return ret;
+
+ /*
+ * according to datasheet add 100us grace time after regular
+ * regulator enable delay.
+ */
+ udelay(100);
+ }
+
ret = devm_add_action(&client->dev, zforce_reset, ts);
if (ret) {
dev_err(&client->dev, "failed to register reset action, %d\n",
ret);
+
+ /* hereafter the regulator will be disabled by the action */
+ if (!IS_ERR(ts->reg_vdd))
+ regulator_disable(ts->reg_vdd);
+
return ret;
}