linux-kernel - [PATCH v6 4/8] Input: stmpe-ts: preparations for STMPE ADC driver

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Message-Id: <20190109134208.5660-5-dev@pschenker.ch>
Date:   Wed,  9 Jan 2019 14:42:03 +0100
From:   Philippe Schenker <dev@...henker.ch>
To:     jic23@...nel.org, marcel.ziswiler@...adex.com, stefan@...er.ch
Cc:     robh@...nel.org, alexandre.torgue@...com, shawnguo@...nel.org,
        dmitry.torokhov@...il.com, thierry.reding@...il.com,
        mcoquelin.stm32@...il.com, digetx@...il.com, lee.jones@...aro.org,
        Philippe Schenker <philippe.schenker@...adex.com>,
        linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v6 4/8] Input: stmpe-ts: preparations for STMPE ADC driver

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 v6:
 -  Added Dmitry's ack

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))
-- 
2.20.1