[PATCH 2/2] input: touchscreen mc13xxx: Add mc34708 support

[Lukasz Majewski]

From: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>

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@xxxxxxxxxxxxxx>
Signed-off-by: Lukasz Majewski <lukma@xxxxxxx>

---
Changes from the original patch:
- Simplify the mcXXXXX_set_pen_detection functions
- Fix checkpatch warnings
---
 drivers/input/touchscreen/mc13783_ts.c | 65 +++++++++++++++++++++++++++++++---
 1 file changed, 61 insertions(+), 4 deletions(-)

diff --git a/drivers/input/touchscreen/mc13783_ts.c b/drivers/input/touchscreen/mc13783_ts.c
index 610f10e6aadf..9fcc7069f633 100644
--- a/drivers/input/touchscreen/mc13783_ts.c
+++ b/drivers/input/touchscreen/mc13783_ts.c
@@ -33,6 +33,8 @@ MODULE_PARM_DESC(sample_tolerance,
 		"is supposed to be wrong and is discarded.  Set to 0 to "
 		"disable this check.");
 
+struct mc13xxx_driver_data;
+
 struct mc13783_ts_priv {
 	struct input_dev *idev;
 	struct mc13xxx *mc13xxx;
@@ -40,6 +42,43 @@ struct mc13783_ts_priv {
 	unsigned int sample[4];
 	u8 ato;
 	bool atox;
+	struct mc13xxx_driver_data *drvdata;
+};
+
+enum mc13xxx_type {
+	MC13XXX_TYPE_MC13783,
+	MC13XXX_TYPE_MC34708,
+};
+
+struct mc13xxx_driver_data {
+	int (*set_pen_detection)(struct mc13783_ts_priv *priv, bool enable);
+	enum mc13xxx_type type;
+};
+
+static int mc13783_set_pen_detection(struct mc13783_ts_priv *priv, bool enable)
+{
+	return mc13xxx_reg_rmw(priv->mc13xxx, MC13XXX_ADC0,
+			       MC13XXX_ADC0_TSMOD_MASK,
+			       enable ? MC13XXX_ADC0_TSMOD0 : 0);
+}
+
+#define MC34708_ADC0_TSPENDETEN		(1 << 20)
+
+static int mc34708_set_pen_detection(struct mc13783_ts_priv *priv, bool enable)
+{
+	return mc13xxx_reg_rmw(priv->mc13xxx, MC13XXX_ADC0,
+			       MC34708_ADC0_TSPENDETEN,
+			       enable ? MC34708_ADC0_TSPENDETEN : 0);
+}
+
+static struct mc13xxx_driver_data mc13783_driver_data = {
+	.type = MC13XXX_TYPE_MC13783,
+	.set_pen_detection = mc13783_set_pen_detection,
+};
+
+static struct mc13xxx_driver_data mc34708_driver_data = {
+	.type = MC13XXX_TYPE_MC34708,
+	.set_pen_detection = mc34708_set_pen_detection,
 };
 
 static irqreturn_t mc13783_ts_handler(int irq, void *data)
@@ -96,6 +135,10 @@ static void mc13783_ts_report_sample(struct mc13783_ts_priv *priv)
 
 	cr0 = (cr0 + cr1) / 2;
 
+	if (priv->drvdata->type == MC13XXX_TYPE_MC34708)
+		if (cr0 > 4080)
+			cr0 = 0;
+
 	if (!cr0 || !sample_tolerance ||
 			(x2 - x0 < sample_tolerance &&
 			 y2 - y0 < sample_tolerance)) {
@@ -148,8 +191,7 @@ static int mc13783_ts_open(struct input_dev *dev)
 	if (ret)
 		goto out;
 
-	ret = mc13xxx_reg_rmw(priv->mc13xxx, MC13XXX_ADC0,
-			MC13XXX_ADC0_TSMOD_MASK, MC13XXX_ADC0_TSMOD0);
+	ret = priv->drvdata->set_pen_detection(priv, 1);
 	if (ret)
 		mc13xxx_irq_free(priv->mc13xxx, MC13XXX_IRQ_TS, priv);
 out:
@@ -162,8 +204,7 @@ static void mc13783_ts_close(struct input_dev *dev)
 	struct mc13783_ts_priv *priv = input_get_drvdata(dev);
 
 	mc13xxx_lock(priv->mc13xxx);
-	mc13xxx_reg_rmw(priv->mc13xxx, MC13XXX_ADC0,
-			MC13XXX_ADC0_TSMOD_MASK, 0);
+	priv->drvdata->set_pen_detection(priv, 0);
 	mc13xxx_irq_free(priv->mc13xxx, MC13XXX_IRQ_TS, priv);
 	mc13xxx_unlock(priv->mc13xxx);
 
@@ -175,6 +216,7 @@ 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);
@@ -185,6 +227,7 @@ 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->drvdata = (void *)id->driver_data;
 
 	if (pdata) {
 		priv->atox = pdata->atox;
@@ -231,7 +274,21 @@ static int mc13783_ts_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static const struct platform_device_id mc13xxx_ts_idtable[] = {
+	{
+		.name = "mc13783-ts",
+		.driver_data = (kernel_ulong_t)&mc13783_driver_data,
+	}, {
+		.name = "mc34708-ts",
+		.driver_data = (kernel_ulong_t)&mc34708_driver_data,
+	}, {
+		/* 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