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SubjectRe: [PATCH 6/9] Input: goodix - Add vcc-supply regulator support
On Mon, Dec 03, 2018 at 03:45:44PM +0530, Jagan Teki wrote:
> vcc-supply property is need for some Goodix CTP controller like GT5663
> where 3.3V external pull-up regulator connected via controller VCC pin.
>
> So, enable the regulator for those it attached the vcc-supply.
>
> Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
> ---
> drivers/input/touchscreen/goodix.c | 39 ++++++++++++++++++++++++++----
> 1 file changed, 34 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/input/touchscreen/goodix.c b/drivers/input/touchscreen/goodix.c
> index f2d9c2c41885..7adcf1491609 100644
> --- a/drivers/input/touchscreen/goodix.c
> +++ b/drivers/input/touchscreen/goodix.c
> @@ -27,6 +27,7 @@
> #include <linux/delay.h>
> #include <linux/irq.h>
> #include <linux/interrupt.h>
> +#include <linux/regulator/consumer.h>
> #include <linux/slab.h>
> #include <linux/acpi.h>
> #include <linux/of.h>
> @@ -47,6 +48,7 @@ struct goodix_ts_data {
> struct touchscreen_properties prop;
> unsigned int max_touch_num;
> unsigned int int_trigger_type;
> + struct regulator *vcc;
> struct gpio_desc *gpiod_int;
> struct gpio_desc *gpiod_rst;
> u16 id;
> @@ -58,6 +60,7 @@ struct goodix_ts_data {
>
> #define GOODIX_GPIO_INT_NAME "irq"
> #define GOODIX_GPIO_RST_NAME "reset"
> +#define GOODIX_VCC_CTP_NAME "vcc"
>
> #define GOODIX_MAX_HEIGHT 4096
> #define GOODIX_MAX_WIDTH 4096
> @@ -525,12 +528,24 @@ static int goodix_get_gpio_config(struct goodix_ts_data *ts)
> {
> int error;
> struct device *dev;
> + struct regulator *regulator;
> struct gpio_desc *gpiod;
>
> if (!ts->client)
> return -EINVAL;
> dev = &ts->client->dev;
>
> + regulator = devm_regulator_get(dev, GOODIX_VCC_CTP_NAME);
> + if (IS_ERR(regulator)) {
> + error = PTR_ERR(regulator);
> + if (error != -EPROBE_DEFER)
> + dev_err(dev, "Failed to get vcc regulator: %d\n",
> + error);
> + return error;
> + }
> +
> + ts->vcc = regulator;
> +
> /* Get the interrupt GPIO pin number */
> gpiod = devm_gpiod_get_optional(dev, GOODIX_GPIO_INT_NAME, GPIOD_IN);
> if (IS_ERR(gpiod)) {
> @@ -786,25 +801,34 @@ static int goodix_ts_probe(struct i2c_client *client,
> if (error)
> return error;
>
> + /* power the controller */
> + if (ts->vcc) {

ts->vcc is never NULL.

> + error = regulator_enable(ts->vcc);
> + if (error) {
> + dev_err(&client->dev, "Controller fail to enable vcc\n");
> + return error;
> + }
> + }
> +
> if (ts->gpiod_int && ts->gpiod_rst) {
> /* reset the controller */
> error = goodix_reset(ts);
> if (error) {
> dev_err(&client->dev, "Controller reset failed.\n");
> - return error;
> + goto error;
> }
> }
>
> error = goodix_i2c_test(client);
> if (error) {
> dev_err(&client->dev, "I2C communication failure: %d\n", error);
> - return error;
> + goto error;
> }
>
> error = goodix_read_version(ts);
> if (error) {
> dev_err(&client->dev, "Read version failed.\n");
> - return error;
> + goto error;
> }
>
> ts->chip = goodix_get_chip_data(ts->id);
> @@ -823,17 +847,22 @@ static int goodix_ts_probe(struct i2c_client *client,
> dev_err(&client->dev,
> "Failed to invoke firmware loader: %d\n",
> error);
> - return error;
> + goto error;
> }
>
> return 0;
> } else {
> error = goodix_configure_dev(ts);
> if (error)
> - return error;
> + goto error;
> }
>
> return 0;
> +
> +error:
> + if (ts->vcc)
> + regulator_disable(ts->vcc);

Same here.

> + return error;
> }
>
> static int goodix_ts_remove(struct i2c_client *client)

You need to disable regulator on removal as well.

Thanks.

--
Dmitry

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