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| author |   Heiko Stuebner <heiko.stuebner@bq.com> | 2014-07-21 10:02:11 -0700 |
|---|---|---|
| committer |   Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2014-07-21 10:28:53 -0700 |
| commit | 3974037039e925a9645e70e1dc91735d28faad95 (patch) | |
| tree | 7b2f7879d3b9463178643894b4bd69281ca5093b /drivers/input/touchscreen/zforce_ts.c | |
| parent | Input: s3c2410_ts - fix preparing/enabling clock (diff) | |
| download | linux-dev-3974037039e925a9645e70e1dc91735d28faad95.tar.xz linux-dev-3974037039e925a9645e70e1dc91735d28faad95.zip | |
Input: zforce - add regulator handling
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@bq.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'drivers/input/touchscreen/zforce_ts.c')
| -rw-r--r-- | drivers/input/touchscreen/zforce_ts.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/zforce_ts.c b/drivers/input/touchscreen/zforce_ts.c index feea85b52fa8..8ba48f5eff7b 100644 --- a/drivers/input/touchscreen/zforce_ts.c +++ b/drivers/input/touchscreen/zforce_ts.c @@ -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 +774,32 @@ 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)) { + ret = PTR_ERR(ts->reg_vdd); + if (ret == -EPROBE_DEFER) + return ret; + } else { + 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; } |