linux-kernel - Re: [PATCH 5/9] Input: pixcir_i2c_ts: Get rid of pdata->attb_read

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Date:	Wed, 18 Dec 2013 06:20:56 -0800
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Roger Quadros <rogerq@...com>
Cc:	rydberg@...omail.se, jcbian@...cir.com.cn,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: Re: [PATCH 5/9] Input: pixcir_i2c_ts: Get rid of
 pdata->attb_read_val()

On Wed, Dec 18, 2013 at 02:51:16PM +0530, Roger Quadros wrote:
> Get rid of the attb_read_val() platform hook. Instead,
> read the ATTB gpio directly from the driver.
> 
> Fail if valid ATTB gpio is not provided by patform data.

Do you also need to define polarity?

> 
> Signed-off-by: Roger Quadros <rogerq@...com>
> Acked-by: Mugunthan V N <mugunthanvnm@...com>
> ---
>  drivers/input/touchscreen/pixcir_i2c_ts.c | 19 +++++++++++++++++--
>  include/linux/input/pixcir_ts.h           |  1 -
>  2 files changed, 17 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/input/touchscreen/pixcir_i2c_ts.c b/drivers/input/touchscreen/pixcir_i2c_ts.c
> index 3370fd9..a783d94 100644
> --- a/drivers/input/touchscreen/pixcir_i2c_ts.c
> +++ b/drivers/input/touchscreen/pixcir_i2c_ts.c
> @@ -91,11 +91,12 @@ static void pixcir_ts_poscheck(struct pixcir_i2c_ts_data *data)
>  static irqreturn_t pixcir_ts_isr(int irq, void *dev_id)
>  {
>  	struct pixcir_i2c_ts_data *tsdata = dev_id;
> +	const struct pixcir_ts_platform_data *pdata = tsdata->chip;
>  
>  	while (!tsdata->exiting) {
>  		pixcir_ts_poscheck(tsdata);
>  
> -		if (tsdata->chip->attb_read_val())
> +		if (gpio_get_value(pdata->gpio_attb))
>  			break;
>  
>  		msleep(20);
> @@ -301,8 +302,10 @@ static struct pixcir_ts_platform_data *pixcir_parse_dt(struct device *dev)
>  		return ERR_PTR(-ENOMEM);
>  
>  	pdata->gpio_attb = of_get_named_gpio(np, "attb-gpio", 0);
> -	if (!gpio_is_valid(pdata->gpio_attb))
> +	if (!gpio_is_valid(pdata->gpio_attb)) {
>  		dev_err(dev, "Failed to get ATTB GPIO\n");
> +		return ERR_PTR(-EINVAL);
> +	}
>  
>  	if (of_property_read_u32(np, "x-size", &pdata->x_size)) {
>  		dev_err(dev, "Failed to get x-size property\n");
> @@ -344,6 +347,11 @@ static int pixcir_i2c_ts_probe(struct i2c_client *client,
>  	} else if (!pdata) {
>  		dev_err(&client->dev, "platform data not defined\n");
>  		return -EINVAL;
> +	} else {
> +		if (!gpio_is_valid(pdata->gpio_attb)) {
> +			dev_err(dev, "Invalid gpio_attb in pdata\n");
> +			return -EINVAL;
> +		}
>  	}
>  
>  	tsdata = devm_kzalloc(dev, sizeof(*tsdata), GFP_KERNEL);
> @@ -380,6 +388,13 @@ static int pixcir_i2c_ts_probe(struct i2c_client *client,
>  
>  	input_set_drvdata(input, tsdata);
>  
> +	error = devm_gpio_request_one(dev, pdata->gpio_attb,
> +			GPIOF_DIR_IN, "pixcir_i2c_attb");
> +	if (error) {
> +		dev_err(dev, "Failed to request ATTB gpio\n");
> +		return error;
> +	}
> +
>  	error = devm_request_threaded_irq(dev, client->irq, NULL, pixcir_ts_isr,
>  				     IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
>  				     client->name, tsdata);
> diff --git a/include/linux/input/pixcir_ts.h b/include/linux/input/pixcir_ts.h
> index f17c192..88ffdb50 100644
> --- a/include/linux/input/pixcir_ts.h
> +++ b/include/linux/input/pixcir_ts.h
> @@ -44,7 +44,6 @@ enum pixcir_int_mode {
>  #define PIXCIR_INT_POL_HIGH	(1UL << 2)
>  
>  struct pixcir_ts_platform_data {
> -	int (*attb_read_val)(void);
>  	unsigned int x_size;	/* X axis resolution */
>  	unsigned int y_size;	/* Y axis resolution */
>  	int gpio_attb;		/* GPIO connected to ATTB line */
> -- 
> 1.8.3.2
> 

-- 
Dmitry
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