Re: [PATCH 6/6] Input: pixcir_i2c_ts - use standard OF touchscreen parsing code

[Roger Quadros <rogerq@xxxxxx>]

On 07/07/15 03:30, Dmitry Torokhov wrote:
> Let's switch to using standard touchscreen device properties parsing module
> instead of doing it by hand in the driver.
>
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>

Acked-by: Roger Quadros <rogerq@xxxxxx>

cheers,
-roger

> ---
>   drivers/input/touchscreen/pixcir_i2c_ts.c | 95 ++++++++++++++-----------------
>   1 file changed, 44 insertions(+), 51 deletions(-)
>
> diff --git a/drivers/input/touchscreen/pixcir_i2c_ts.c b/drivers/input/touchscreen/pixcir_i2c_ts.c
> index 043d219..31f1c7d 100644
> --- a/drivers/input/touchscreen/pixcir_i2c_ts.c
> +++ b/drivers/input/touchscreen/pixcir_i2c_ts.c
> @@ -24,9 +24,10 @@
>   #include <linux/i2c.h>
>   #include <linux/input.h>
>   #include <linux/input/mt.h>
> +#include <linux/input/touchscreen.h>
>   #include <linux/gpio.h>
>   #include <linux/gpio/consumer.h>
> -#include <linux/of.h>
> +/*#include <linux/of.h>*/
>   #include <linux/of_device.h>
>   #include <linux/platform_data/pixcir_i2c_ts.h>
>
> @@ -37,9 +38,9 @@ struct pixcir_i2c_ts_data {
>   	struct input_dev *input;
>   	struct gpio_desc *gpio_attb;
>   	struct gpio_desc *gpio_reset;
> -	const struct pixcir_ts_platform_data *pdata;
> -	bool running;
> +	const struct pixcir_i2c_chip_data *chip;
>   	int max_fingers;	/* Max fingers supported in this instance */
> +	bool running;
>   };
>
>   struct pixcir_touch {
> @@ -62,7 +63,7 @@ static void pixcir_ts_parse(struct pixcir_i2c_ts_data *tsdata,
>   	u8 touch;
>   	int ret, i;
>   	int readsize;
> -	const struct pixcir_i2c_chip_data *chip = &tsdata->pdata->chip;
> +	const struct pixcir_i2c_chip_data *chip = tsdata->chip;
>
>   	memset(report, 0, sizeof(struct pixcir_report_data));
>
> @@ -115,13 +116,13 @@ static void pixcir_ts_report(struct pixcir_i2c_ts_data *ts,
>   	struct pixcir_touch *touch;
>   	int n, i, slot;
>   	struct device *dev = &ts->client->dev;
> -	const struct pixcir_i2c_chip_data *chip = &ts->pdata->chip;
> +	const struct pixcir_i2c_chip_data *chip = ts->chip;
>
>   	n = report->num_touches;
>   	if (n > PIXCIR_MAX_SLOTS)
>   		n = PIXCIR_MAX_SLOTS;
>
> -	if (!chip->has_hw_ids) {
> +	if (!ts->chip->has_hw_ids) {
>   		for (i = 0; i < n; i++) {
>   			touch = &report->touches[i];
>   			pos[i].x = touch->x;
> @@ -423,77 +424,59 @@ static SIMPLE_DEV_PM_OPS(pixcir_dev_pm_ops,
>   #ifdef CONFIG_OF
>   static const struct of_device_id pixcir_of_match[];
>
> -static struct pixcir_ts_platform_data *pixcir_parse_dt(struct device *dev)
> +static int pixcir_parse_dt(struct device *dev,
> +			   struct pixcir_i2c_ts_data *tsdata)
>   {
> -	struct pixcir_ts_platform_data *pdata;
> -	struct device_node *np = dev->of_node;
>   	const struct of_device_id *match;
>
>   	match = of_match_device(of_match_ptr(pixcir_of_match), dev);
>   	if (!match)
> -		return ERR_PTR(-EINVAL);
> -
> -	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
> -	if (!pdata)
> -		return ERR_PTR(-ENOMEM);
> -
> -	pdata->chip = *(const struct pixcir_i2c_chip_data *)match->data;
> -
> -	if (of_property_read_u32(np, "touchscreen-size-x", &pdata->x_max)) {
> -		dev_err(dev, "Failed to get touchscreen-size-x property\n");
> -		return ERR_PTR(-EINVAL);
> -	}
> -	pdata->x_max -= 1;
> -
> -	if (of_property_read_u32(np, "touchscreen-size-y", &pdata->y_max)) {
> -		dev_err(dev, "Failed to get touchscreen-size-y property\n");
> -		return ERR_PTR(-EINVAL);
> -	}
> -	pdata->y_max -= 1;
> +		return -EINVAL;
>
> -	dev_dbg(dev, "%s: x %d, y %d\n", __func__,
> -		pdata->x_max + 1, pdata->y_max + 1);
> +	tsdata->chip = (const struct pixcir_i2c_chip_data *)match->data;
> +	if (!tsdata->chip)
> +		return -EINVAL;
>
> -	return pdata;
> +	return 0;
>   }
>   #else
> -static struct pixcir_ts_platform_data *pixcir_parse_dt(struct device *dev)
> +static int pixcir_parse_dt(struct device *dev,
> +			   struct pixcir_i2c_ts_data *tsdata)
>   {
> -	return ERR_PTR(-EINVAL);
> +	return -EINVAL;
>   }
>   #endif
>
>   static int pixcir_i2c_ts_probe(struct i2c_client *client,
> -					 const struct i2c_device_id *id)
> +			       const struct i2c_device_id *id)
>   {
>   	const struct pixcir_ts_platform_data *pdata =
>   			dev_get_platdata(&client->dev);
>   	struct device *dev = &client->dev;
> -	struct device_node *np = dev->of_node;
>   	struct pixcir_i2c_ts_data *tsdata;
>   	struct input_dev *input;
>   	int error;
>
> -	if (np && !pdata) {
> -		pdata = pixcir_parse_dt(dev);
> -		if (IS_ERR(pdata))
> -			return PTR_ERR(pdata);
> -	}
> +	tsdata = devm_kzalloc(dev, sizeof(*tsdata), GFP_KERNEL);
> +	if (!tsdata)
> +		return -ENOMEM;
>
> -	if (!pdata) {
> +	if (pdata) {
> +		tsdata->chip = &pdata->chip;
> +	} else if (dev->of_node) {
> +		error = pixcir_parse_dt(dev, tsdata);
> +		if (error)
> +			return error;
> +	} else {
>   		dev_err(&client->dev, "platform data not defined\n");
>   		return -EINVAL;
>   	}
>
> -	if (!pdata->chip.max_fingers) {
> -		dev_err(dev, "Invalid max_fingers in pdata\n");
> +	if (!tsdata->chip->max_fingers) {
> +		dev_err(dev, "Invalid max_fingers in chip data\n");
>   		return -EINVAL;
>   	}
>
> -	tsdata = devm_kzalloc(dev, sizeof(*tsdata), GFP_KERNEL);
> -	if (!tsdata)
> -		return -ENOMEM;
> -
>   	input = devm_input_allocate_device(dev);
>   	if (!input) {
>   		dev_err(dev, "Failed to allocate input device\n");
> @@ -502,7 +485,6 @@ static int pixcir_i2c_ts_probe(struct i2c_client *client,
>
>   	tsdata->client = client;
>   	tsdata->input = input;
> -	tsdata->pdata = pdata;
>
>   	input->name = client->name;
>   	input->id.bustype = BUS_I2C;
> @@ -510,10 +492,21 @@ static int pixcir_i2c_ts_probe(struct i2c_client *client,
>   	input->close = pixcir_input_close;
>   	input->dev.parent = &client->dev;
>
> -	input_set_abs_params(input, ABS_MT_POSITION_X, 0, pdata->x_max, 0, 0);
> -	input_set_abs_params(input, ABS_MT_POSITION_Y, 0, pdata->y_max, 0, 0);
> +	if (pdata) {
> +		input_set_abs_params(input, ABS_MT_POSITION_X, 0, pdata->x_max, 0, 0);
> +		input_set_abs_params(input, ABS_MT_POSITION_Y, 0, pdata->y_max, 0, 0);
> +	} else {
> +		input_set_capability(input, EV_ABS, ABS_MT_POSITION_X);
> +		input_set_capability(input, EV_ABS, ABS_MT_POSITION_Y);
> +		touchscreen_parse_properties(input, true);
> +		if (!input_abs_get_max(input, ABS_MT_POSITION_X) ||
> +		    !input_abs_get_max(input, ABS_MT_POSITION_Y)) {
> +			dev_err(dev, "Touchscreen size is not specified\n");
> +			return -EINVAL;
> +		}
> +	}
>
> -	tsdata->max_fingers = tsdata->pdata->chip.max_fingers;
> +	tsdata->max_fingers = tsdata->chip->max_fingers;
>   	if (tsdata->max_fingers > PIXCIR_MAX_SLOTS) {
>   		tsdata->max_fingers = PIXCIR_MAX_SLOTS;
>   		dev_info(dev, "Limiting maximum fingers to %d\n",
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