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Message-Id: <20190716221929.3782-4-lukma@denx.de>
Date: Wed, 17 Jul 2019 00:19:29 +0200
From: Lukasz Majewski <lukma@...x.de>
To: Lee Jones <lee.jones@...aro.org>
Cc: linux-kernel@...r.kernel.org,
Dmitry Torokhov <dmitry.torokhov@...il.com>,
Sascha Hauer <s.hauer@...gutronix.de>,
Enrico Weigelt <info@...ux.net>,
Thomas Gleixner <tglx@...utronix.de>,
Kate Stewart <kstewart@...uxfoundation.org>,
linux-input@...r.kernel.org, Lukasz Majewski <lukma@...x.de>
Subject: [PATCH v3 3/3] input: touchscreen mc13xxx: Add mc34708 support
From: Sascha Hauer <s.hauer@...gutronix.de>
The mc34708 has a different bit to enable pen detection. This
adds the driver data and devtype necessary to probe the device
and to distinguish between the mc13783 and the mc34708.
Signed-off-by: Sascha Hauer <s.hauer@...gutronix.de>
Signed-off-by: Lukasz Majewski <lukma@...x.de>
---
Changes for v3:
- Replace forward declaration of mc13xxx_driver_data with
structure definition
- Rename mc13xxx_driver_data with mc13xxx_chip
- Move static struct mc13xxx_chip mc13783_chip and mc34708_chip
closer to ID table
- Do not check mc13xxx device type
Changes for v2:
- Change nested if statements to a single one (with cr0 > ...)
- Replace hardcoded max resistance value (4080) with a generic driver data
value.
- Introduce new include/linux/mfd/mc34708.h header file for mc34708 specific
defines
- Define as driver data mask and value for accessing mc13xxx registers
Changes from the original patch:
- Simplify the mcXXXXX_set_pen_detection functions
- Fix checkpatch warnings
---
drivers/input/touchscreen/mc13783_ts.c | 56 +++++++++++++++++++++++++++++++---
1 file changed, 52 insertions(+), 4 deletions(-)
diff --git a/drivers/input/touchscreen/mc13783_ts.c b/drivers/input/touchscreen/mc13783_ts.c
index edd49e44e0c9..857c11235141 100644
--- a/drivers/input/touchscreen/mc13783_ts.c
+++ b/drivers/input/touchscreen/mc13783_ts.c
@@ -10,6 +10,7 @@
*/
#include <linux/platform_device.h>
#include <linux/mfd/mc13783.h>
+#include <linux/mfd/mc34708.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/input.h>
@@ -30,6 +31,18 @@ MODULE_PARM_DESC(sample_tolerance,
"is supposed to be wrong and is discarded. Set to 0 to "
"disable this check.");
+enum mc13xxx_type {
+ MC13XXX_TYPE_MC13783,
+ MC13XXX_TYPE_MC34708,
+};
+
+struct mc13xxx_chip {
+ enum mc13xxx_type type;
+ int max_resistance;
+ u32 reg_mask;
+ u32 reg_value;
+};
+
struct mc13783_ts_priv {
struct input_dev *idev;
struct mc13xxx *mc13xxx;
@@ -37,6 +50,7 @@ struct mc13783_ts_priv {
unsigned int sample[4];
u8 ato;
bool atox;
+ const struct mc13xxx_chip *chip;
};
static irqreturn_t mc13783_ts_handler(int irq, void *data)
@@ -93,6 +107,9 @@ static void mc13783_ts_report_sample(struct mc13783_ts_priv *priv)
cr0 = (cr0 + cr1) / 2;
+ if (cr0 > priv->chip->max_resistance)
+ cr0 = 0;
+
if (!cr0 || !sample_tolerance ||
(x2 - x0 < sample_tolerance &&
y2 - y0 < sample_tolerance)) {
@@ -102,14 +119,14 @@ static void mc13783_ts_report_sample(struct mc13783_ts_priv *priv)
input_report_abs(idev, ABS_Y, y1);
dev_dbg(&idev->dev, "report (%d, %d, %d)\n",
- x1, y1, 0x1000 - cr0);
+ x1, y1, priv->chip->max_resistance - cr0);
schedule_delayed_work(&priv->work, HZ / 50);
} else {
dev_dbg(&idev->dev, "report release\n");
}
input_report_abs(idev, ABS_PRESSURE,
- cr0 ? 0x1000 - cr0 : cr0);
+ cr0 ? priv->chip->max_resistance - cr0 : 0);
input_report_key(idev, BTN_TOUCH, cr0);
input_sync(idev);
} else {
@@ -146,7 +163,8 @@ static int mc13783_ts_open(struct input_dev *dev)
goto out;
ret = mc13xxx_reg_rmw(priv->mc13xxx, MC13XXX_ADC0,
- MC13XXX_ADC0_TSMOD_MASK, MC13XXX_ADC0_TSMOD0);
+ priv->chip->reg_mask,
+ priv->chip->reg_value);
if (ret)
mc13xxx_irq_free(priv->mc13xxx, MC13XXX_IRQ_TS, priv);
out:
@@ -160,7 +178,7 @@ static void mc13783_ts_close(struct input_dev *dev)
mc13xxx_lock(priv->mc13xxx);
mc13xxx_reg_rmw(priv->mc13xxx, MC13XXX_ADC0,
- MC13XXX_ADC0_TSMOD_MASK, 0);
+ priv->chip->reg_mask, 0);
mc13xxx_irq_free(priv->mc13xxx, MC13XXX_IRQ_TS, priv);
mc13xxx_unlock(priv->mc13xxx);
@@ -172,6 +190,7 @@ static int __init mc13783_ts_probe(struct platform_device *pdev)
struct mc13783_ts_priv *priv;
struct mc13xxx_ts_platform_data *pdata = dev_get_platdata(&pdev->dev);
struct input_dev *idev;
+ const struct platform_device_id *id = platform_get_device_id(pdev);
int ret = -ENOMEM;
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
@@ -182,6 +201,7 @@ static int __init mc13783_ts_probe(struct platform_device *pdev)
INIT_DELAYED_WORK(&priv->work, mc13783_ts_work);
priv->mc13xxx = dev_get_drvdata(pdev->dev.parent);
priv->idev = idev;
+ priv->chip = (void *)id->driver_data;
if (pdata) {
priv->atox = pdata->atox;
@@ -228,7 +248,35 @@ static int mc13783_ts_remove(struct platform_device *pdev)
return 0;
}
+static struct mc13xxx_chip mc13783_chip = {
+ .type = MC13XXX_TYPE_MC13783,
+ .max_resistance = 4096,
+ .reg_mask = MC13XXX_ADC0_TSMOD_MASK,
+ .reg_value = MC13XXX_ADC0_TSMOD0,
+};
+
+static struct mc13xxx_chip mc34708_chip = {
+ .type = MC13XXX_TYPE_MC34708,
+ .max_resistance = 4080,
+ .reg_mask = MC34708_ADC0_TSMASK,
+ .reg_value = MC34708_ADC0_TSPENDETEN,
+};
+
+static const struct platform_device_id mc13xxx_ts_idtable[] = {
+ {
+ .name = "mc13783-ts",
+ .driver_data = (kernel_ulong_t)&mc13783_chip,
+ }, {
+ .name = "mc34708-ts",
+ .driver_data = (kernel_ulong_t)&mc34708_chip,
+ }, {
+ /* sentinel */
+ }
+};
+MODULE_DEVICE_TABLE(platform, mc13xxx_ts_idtable);
+
static struct platform_driver mc13783_ts_driver = {
+ .id_table = mc13xxx_ts_idtable,
.remove = mc13783_ts_remove,
.driver = {
.name = MC13783_TS_NAME,
--
2.11.0
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