linux-kernel - Re: [PATCH v5 4/8] Input: stmpe-ts: preparations for STMPE ADC driver

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Date:   Mon, 7 Jan 2019 23:03:30 +0000
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Philippe Schenker <dev@...henker.ch>
Cc:     jic23@...nel.org, marcel.ziswiler@...adex.com, stefan@...er.ch,
        robh@...nel.org, alexandre.torgue@...com, shawnguo@...nel.org,
        thierry.reding@...il.com, digetx@...il.com, lee.jones@...aro.org,
        coquelin.stm32@...il.com,
        Philippe Schenker <philippe.schenker@...adex.com>,
        linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v5 4/8] Input: stmpe-ts: preparations for STMPE ADC driver

On Fri, Dec 21, 2018 at 02:46:33PM +0100, Philippe Schenker wrote:
> From: Philippe Schenker <philippe.schenker@...adex.com>
> 
> This patch removes common ADC settings in favor to use
> stmpe811_adc_common_init that is present in MFD. This is necessary in
> preparation for the stmpe-adc driver, because those two drivers have
> common settings for the ADC.
> 
> Signed-off-by: Philippe Schenker <philippe.schenker@...adex.com>

Acked-by: Dmitry Torokhov <dmitry.torokhov@...il.com>

> 
> ---
> 
> Changes in v5:
>  - Changed author of commit to use correct email.
> 
> Changes in v4:
>  - New patch: Split changes in stmpe-ts.c to a separate commit
>  - Remove common adc settings from init and call the
>    stmpe811_adc_common_init function
> 
> Changes in v3:
>  - Undo ADC-settings related code-deletions in stmpe-ts.c that the code
>    is backwards-compatible to older devicetrees.
> 
> Changes in v2: None
> 
>  drivers/input/touchscreen/stmpe-ts.c | 42 +++++-----------------------
>  1 file changed, 7 insertions(+), 35 deletions(-)
> 
> diff --git a/drivers/input/touchscreen/stmpe-ts.c b/drivers/input/touchscreen/stmpe-ts.c
> index c5d9006588a2..cf9c9aa39f6e 100644
> --- a/drivers/input/touchscreen/stmpe-ts.c
> +++ b/drivers/input/touchscreen/stmpe-ts.c
> @@ -30,8 +30,6 @@
>   * with touchscreen controller
>   */
>  #define STMPE_REG_INT_STA		0x0B
> -#define STMPE_REG_ADC_CTRL1		0x20
> -#define STMPE_REG_ADC_CTRL2		0x21
>  #define STMPE_REG_TSC_CTRL		0x40
>  #define STMPE_REG_TSC_CFG		0x41
>  #define STMPE_REG_FIFO_TH		0x4A
> @@ -58,15 +56,6 @@
>   * @idev: registered input device
>   * @work: a work item used to scan the device
>   * @dev: a pointer back to the MFD cell struct device*
> - * @sample_time: ADC converstion time in number of clock.
> - * (0 -> 36 clocks, 1 -> 44 clocks, 2 -> 56 clocks, 3 -> 64 clocks,
> - * 4 -> 80 clocks, 5 -> 96 clocks, 6 -> 144 clocks),
> - * recommended is 4.
> - * @mod_12b: ADC Bit mode (0 -> 10bit ADC, 1 -> 12bit ADC)
> - * @ref_sel: ADC reference source
> - * (0 -> internal reference, 1 -> external reference)
> - * @adc_freq: ADC Clock speed
> - * (0 -> 1.625 MHz, 1 -> 3.25 MHz, 2 || 3 -> 6.5 MHz)
>   * @ave_ctrl: Sample average control
>   * (0 -> 1 sample, 1 -> 2 samples, 2 -> 4 samples, 3 -> 8 samples)
>   * @touch_det_delay: Touch detect interrupt delay
> @@ -88,10 +77,6 @@ struct stmpe_touch {
>  	struct input_dev *idev;
>  	struct delayed_work work;
>  	struct device *dev;
> -	u8 sample_time;
> -	u8 mod_12b;
> -	u8 ref_sel;
> -	u8 adc_freq;
>  	u8 ave_ctrl;
>  	u8 touch_det_delay;
>  	u8 settling;
> @@ -192,7 +177,7 @@ static irqreturn_t stmpe_ts_handler(int irq, void *data)
>  static int stmpe_init_hw(struct stmpe_touch *ts)
>  {
>  	int ret;
> -	u8 adc_ctrl1, adc_ctrl1_mask, tsc_cfg, tsc_cfg_mask;
> +	u8 tsc_cfg, tsc_cfg_mask;
>  	struct stmpe *stmpe = ts->stmpe;
>  	struct device *dev = ts->dev;
>  
> @@ -202,22 +187,9 @@ static int stmpe_init_hw(struct stmpe_touch *ts)
>  		return ret;
>  	}
>  
> -	adc_ctrl1 = STMPE_SAMPLE_TIME(ts->sample_time) |
> -		    STMPE_MOD_12B(ts->mod_12b) | STMPE_REF_SEL(ts->ref_sel);
> -	adc_ctrl1_mask = STMPE_SAMPLE_TIME(0xff) | STMPE_MOD_12B(0xff) |
> -			 STMPE_REF_SEL(0xff);
> -
> -	ret = stmpe_set_bits(stmpe, STMPE_REG_ADC_CTRL1,
> -			adc_ctrl1_mask, adc_ctrl1);
> -	if (ret) {
> -		dev_err(dev, "Could not setup ADC\n");
> -		return ret;
> -	}
> -
> -	ret = stmpe_set_bits(stmpe, STMPE_REG_ADC_CTRL2,
> -			STMPE_ADC_FREQ(0xff), STMPE_ADC_FREQ(ts->adc_freq));
> +	ret = stmpe811_adc_common_init(stmpe);
>  	if (ret) {
> -		dev_err(dev, "Could not setup ADC\n");
> +		stmpe_disable(stmpe, STMPE_BLOCK_TOUCHSCREEN | STMPE_BLOCK_ADC);
>  		return ret;
>  	}
>  
> @@ -295,13 +267,13 @@ static void stmpe_ts_get_platform_info(struct platform_device *pdev,
>  
>  	if (np) {
>  		if (!of_property_read_u32(np, "st,sample-time", &val))
> -			ts->sample_time = val;
> +			ts->stmpe->sample_time = val;
>  		if (!of_property_read_u32(np, "st,mod-12b", &val))
> -			ts->mod_12b = val;
> +			ts->stmpe->mod_12b = val;
>  		if (!of_property_read_u32(np, "st,ref-sel", &val))
> -			ts->ref_sel = val;
> +			ts->stmpe->ref_sel = val;
>  		if (!of_property_read_u32(np, "st,adc-freq", &val))
> -			ts->adc_freq = val;
> +			ts->stmpe->adc_freq = val;
>  		if (!of_property_read_u32(np, "st,ave-ctrl", &val))
>  			ts->ave_ctrl = val;
>  		if (!of_property_read_u32(np, "st,touch-det-delay", &val))
> -- 
> 2.19.2
> 

-- 
Dmitry