[PATCH 04/07] Touchscreen: DA9052/53 touchscreen driver v6

[Ashish Jangam]

This driver adds support for DA9052 4-wire resistive ADC interfaced touchscreen
controller.

DA9052 is a MFD therefore this driver depends on DA9052 core driver for core
functionalities.

Signed-off-by: David Dajun Chen <dchen@xxxxxxxxxxx>
Signed-off-by: Ashish Jangam <ashish.jangam@xxxxxxxxxxxxxxx>
---
Changes since v5:
- Use kenel APIs for enabling and disabling irqs
Changes since v4:
- Add string "compile this driver as module" in kconfig
- Replace struct da9052_tsi_reg with temp variable
- Call schedule_delayed_work() from pen down irq handler
- Mask data ready irq in pen up work
- Disable IRQs in device close and enable it in device open
- Remove set_bit() for ABS X,Y,Pressure as input_set_abs_params() does it
Changes since v3:
- Remove unrequire type cast
- Prefix init code with _devinit
- Remove check for workqueue reschedule
- tsi_close() to wait for datardy intr completion
- Remove seperate workqueue
- Move cancel_work_sync to tsi_close()
- Check for drv data before tsi priv data allocation
Changes since v2:
- Replace kthreads with workqueue
- Remove kfifos
- Taken care for bus type
- Replace da9052_set/clear function with da9052_reg_update
- Add open and close functionality
---
 drivers/input/touchscreen/Kconfig      |    7 +
 drivers/input/touchscreen/Makefile     |    1 +
 drivers/input/touchscreen/da9052_tsi.c |  364 ++++++++++++++++++++++++++++++++
 3 files changed, 372 insertions(+), 0 deletions(-)
 create mode 100644 drivers/input/touchscreen/da9052_tsi.c
diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 4af2a18..d7a1597 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -157,6 +157,13 @@ config TOUCHSCREEN_DA9034
 	  Say Y here to enable the support for the touchscreen found
 	  on Dialog Semiconductor DA9034 PMIC.
 
+config TOUCHSCREEN_DA9052
+	tristate "Dialog DA9052 TSI"
+	depends on PMIC_DA9052
+	help
+	  Say y here to support the touchscreen found on
+	  Dialog Semiconductor DA9052 PMIC
+
 config TOUCHSCREEN_DYNAPRO
 	tristate "Dynapro serial touchscreen"
 	select SERIO
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 496091e..b1ee4b7 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -19,6 +19,7 @@ obj-$(CONFIG_TOUCHSCREEN_BITSY)		+= h3600_ts_input.o
 obj-$(CONFIG_TOUCHSCREEN_BU21013)       += bu21013_ts.o
 obj-$(CONFIG_TOUCHSCREEN_CY8CTMG110)	+= cy8ctmg110_ts.o
 obj-$(CONFIG_TOUCHSCREEN_DA9034)	+= da9034-ts.o
+obj-$(CONFIG_TOUCHSCREEN_DA9052)	+= da9052_tsi.o
 obj-$(CONFIG_TOUCHSCREEN_DYNAPRO)	+= dynapro.o
 obj-$(CONFIG_TOUCHSCREEN_HAMPSHIRE)	+= hampshire.o
 obj-$(CONFIG_TOUCHSCREEN_GUNZE)		+= gunze.o
diff --git a/drivers/input/touchscreen/da9052_tsi.c b/drivers/input/touchscreen/da9052_tsi.c
new file mode 100644
index 0000000..61ab7b0
--- /dev/null
+++ b/drivers/input/touchscreen/da9052_tsi.c
@@ -0,0 +1,364 @@
+/*
+ * TSI driver for Dialog DA9052
+ *
+ * Copyright(c) 2011 Dialog Semiconductor Ltd.
+ *
+ * Author: David Dajun Chen <dchen@xxxxxxxxxxx>
+ *
+ *  This program is free software; you can redistribute  it and/or modify it
+ *  under  the terms of  the GNU General  Public License as published by the
+ *  Free Software Foundation;  either version 2 of the  License, or (at your
+ *  option) any later version.
+ *
+ */
+#include <linux/module.h>
+#include <linux/input.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+
+#include <linux/mfd/da9052/reg.h>
+#include <linux/mfd/da9052/da9052.h>
+
+#define TSI_PEN_DOWN_STATUS 0x40
+
+struct da9052_tsi {
+	struct da9052 *da9052;
+	struct input_dev *dev;
+	struct delayed_work ts_pen_work;
+	int irq_pendwn;
+	int irq_datardy;
+};
+
+static int da9052_ts_start(struct da9052_tsi *tsi)
+{
+	return da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG,
+				 1 << 0, 1 << 0);
+}
+
+static int da9052_ts_stop(struct da9052_tsi *tsi)
+{
+	return da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG, 1 << 0, 0);
+}
+
+static irqreturn_t da9052_ts_pendwn_irq(int irq, void *data)
+{
+	struct da9052_tsi *tsi = data;
+	struct da9052 *da9052 = tsi->da9052;
+
+	/* Mask PEN_DOWN event and unmask TSI_READY event */
+	disable_irq_nosync(da9052->irq_base + tsi->irq_pendwn);
+	enable_irq(da9052->irq_base + tsi->irq_datardy);
+
+	da9052_ts_start(tsi);
+
+	input_report_key(tsi->dev, BTN_TOUCH, 1);
+	input_sync(tsi->dev);
+
+	schedule_delayed_work(&tsi->ts_pen_work, HZ/50);
+
+	return IRQ_HANDLED;
+}
+
+static int da9052_ts_read(struct da9052_tsi *tsi)
+{
+	int ret = 0;
+	u16 x, y, z;
+	u8 v;
+
+	ret = da9052_reg_read(tsi->da9052, DA9052_TSI_X_MSB_REG);
+	if (ret < 0)
+		goto exit;
+
+	x = (u16) ret;
+
+	ret = da9052_reg_read(tsi->da9052, DA9052_TSI_Y_MSB_REG);
+	if (ret < 0)
+		goto exit;
+
+	y = (u16) ret;
+
+	ret = da9052_reg_read(tsi->da9052, DA9052_TSI_Z_MSB_REG);
+	if (ret < 0)
+		goto exit;
+
+	z = (u16) ret;
+
+	ret = da9052_reg_read(tsi->da9052, DA9052_TSI_LSB_REG);
+	if (ret < 0)
+		goto exit;
+
+	v = (u8) ret;
+
+	x = ((x << 2) & 0x3fc) | (v & 0x3);
+	y = ((y << 2) & 0x3fc) | ((v & 0xc) >> 2);
+	z = ((z << 2) & 0x3fc) | ((v & 0x30) >> 4);
+
+	input_report_abs(tsi->dev, ABS_X, x);
+	input_report_abs(tsi->dev, ABS_Y, y);
+	input_report_abs(tsi->dev, ABS_PRESSURE, z);
+	input_report_key(tsi->dev, BTN_TOUCH, 1);
+	input_sync(tsi->dev);
+
+exit:
+	return ret;
+}
+
+static irqreturn_t da9052_ts_datardy_irq(int irq, void *data)
+{
+	struct da9052_tsi *tsi = data;
+
+	da9052_ts_read(tsi);
+	return IRQ_HANDLED;
+}
+
+static void da9052_ts_pen_work(struct work_struct *work)
+{
+	struct da9052_tsi *tsi = container_of(work, struct da9052_tsi,
+					      ts_pen_work.work);
+	struct input_dev *ip_dev = tsi->dev;
+	struct da9052 *da9052 = tsi->da9052;
+	int ret;
+
+	ret = da9052_reg_read(tsi->da9052, DA9052_TSI_LSB_REG);
+	if (ret < 0)
+		return;
+
+	if (ret & TSI_PEN_DOWN_STATUS) /* Pen Down */
+		schedule_delayed_work(&tsi->ts_pen_work, HZ/50);
+	else {
+		/* Pen UP */
+		da9052_ts_stop(tsi);
+
+		/* Mask TSI_READY event and unmask PEN_DOWN event */
+		disable_irq(da9052->irq_base + tsi->irq_datardy);
+		enable_irq(da9052->irq_base + tsi->irq_pendwn);
+
+		/* Report Pen UP */
+		input_report_abs(ip_dev, ABS_PRESSURE, 0);
+		input_report_key(ip_dev, BTN_TOUCH, 0);
+		input_sync(ip_dev);
+	}
+}
+
+static int __devinit da9052_ts_configure_gpio(struct da9052 *da9052)
+{
+	int ret;
+
+	ret = da9052_reg_update(da9052, DA9052_GPIO_2_3_REG, 0x30, 0);
+	if (ret < 0)
+		return ret;
+
+	ret = da9052_reg_update(da9052, DA9052_GPIO_4_5_REG, 0x33, 0);
+	if (ret < 0)
+		return ret;
+
+	ret = da9052_reg_update(da9052, DA9052_GPIO_6_7_REG, 0x33, 0);
+
+	return ret;
+}
+
+static int __devinit da9052_configure_tsi(struct da9052_tsi *tsi)
+{
+	ssize_t ret;
+	struct da9052 *da9052 = tsi->da9052;
+
+	ret = da9052_ts_configure_gpio(tsi->da9052);
+	if (ret < 0)
+		return ret;
+
+	/* Measure TSI sample every 1ms */
+	ret = da9052_reg_update(tsi->da9052, DA9052_ADC_CONT_REG,
+				1 << 6, 1 << 6);
+	if (ret < 0)
+		return ret;
+
+	/* TSI_DELAY: 3 slots, TSI_SKIP: 0 slots, TSI_MODE: XYZP */
+	ret = da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG, 0xFC, 0xC0);
+	if (ret < 0)
+		return ret;
+
+	/* Mask PEN_DOWN and TSI_READY events */
+	disable_irq(da9052->irq_base + tsi->irq_pendwn);
+	disable_irq(da9052->irq_base + tsi->irq_datardy);
+
+	/*Supply TSIRef through LD09 */
+	ret = da9052_reg_write(tsi->da9052, DA9052_LDO9_REG, 0x59);
+
+	return ret;
+}
+
+static int da9052_ts_input_open(struct input_dev *input_dev)
+{
+	struct da9052_tsi *tsi = input_get_drvdata(input_dev);
+
+	/* Unmask PEN_DOWN and TSI_READY events */
+	enable_irq(tsi->da9052->irq_base + tsi->irq_pendwn);
+	enable_irq(tsi->da9052->irq_base + tsi->irq_datardy);
+
+	/* Enable Pen Detect Circuit */
+	return da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG,
+				 1 << 1, 1 << 1);
+}
+
+static void da9052_ts_input_close(struct input_dev *input_dev)
+{
+	struct da9052_tsi *tsi = input_get_drvdata(input_dev);
+
+	/* Mask PEN_DOWN and TSI_READY events */
+	disable_irq(tsi->da9052->irq_base + tsi->irq_pendwn);
+	disable_irq(tsi->da9052->irq_base + tsi->irq_datardy);
+
+	cancel_delayed_work_sync(&tsi->ts_pen_work);
+
+	da9052_ts_stop(tsi);
+
+	/* Disable Pen Detect Circuit */
+	da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG, 1 << 1, 0);
+}
+
+static int __devinit da9052_ts_probe(struct platform_device *pdev)
+{
+	struct da9052_tsi *tsi;
+	struct input_dev *input_dev;
+	struct da9052 *da9052;
+	int ret;
+
+	da9052 = dev_get_drvdata(pdev->dev.parent);
+	if (da9052 == NULL)
+		return -EINVAL;
+
+	tsi = kzalloc(sizeof(struct da9052_tsi), GFP_KERNEL);
+	if (!tsi)
+		return -ENOMEM;
+
+	input_dev = input_allocate_device();
+	if (!input_dev) {
+		dev_err(tsi->da9052->dev, "Failed to allocate input device\n");
+		ret = -ENOMEM;
+		goto err_mem;
+	}
+
+	INIT_DELAYED_WORK(&tsi->ts_pen_work, da9052_ts_pen_work);
+
+	tsi->da9052 = da9052;
+
+	input_dev->id.version = 0x0101;
+	input_dev->id.vendor = 0x15B6;
+	input_dev->id.product = 0x9052;
+	input_dev->name = "Dialog DA9052 TouchScreen Driver";
+	input_dev->dev.parent = &pdev->dev;
+	input_dev->open = da9052_ts_input_open;
+	input_dev->close = da9052_ts_input_close;
+	__set_bit(EV_ABS, input_dev->evbit);
+	__set_bit(EV_KEY, input_dev->evbit);
+	__set_bit(BTN_TOUCH, input_dev->keybit);
+
+	input_set_abs_params(input_dev, ABS_X, 0, 1023, 0, 0);
+	input_set_abs_params(input_dev, ABS_Y, 0, 1023, 0, 0);
+	input_set_abs_params(input_dev, ABS_PRESSURE, 0, 1023, 0, 0);
+
+	tsi->dev = input_dev;
+	input_set_drvdata(input_dev, tsi);
+
+	tsi->irq_pendwn = platform_get_irq_byname(pdev, "PENDWN");
+	if (tsi->irq_pendwn < 0) {
+		ret = tsi->irq_pendwn;
+		goto err_input;
+	}
+
+	ret = request_threaded_irq(tsi->da9052->irq_base + tsi->irq_pendwn,
+				   NULL, da9052_ts_pendwn_irq,
+				   IRQF_TRIGGER_LOW | IRQF_ONESHOT,
+				   "PENDWN", tsi);
+	if (ret < 0) {
+		dev_err(tsi->da9052->dev,
+			"Failed to register %s IRQ %d, error = %d\n", "PENDWN",
+			tsi->da9052->irq_base + tsi->irq_pendwn, ret);
+		goto err_input;
+	}
+
+	tsi->irq_datardy = platform_get_irq_byname(pdev, "TSIRDY");
+	if (tsi->irq_datardy < 0) {
+		ret = tsi->irq_datardy;
+		goto err_pendwn_irq;
+	}
+
+	ret = request_threaded_irq(tsi->da9052->irq_base + tsi->irq_datardy,
+				   NULL, da9052_ts_datardy_irq,
+				   IRQF_TRIGGER_LOW | IRQF_ONESHOT,
+				   "TSIRDY", tsi);
+	if (ret < 0) {
+		dev_err(tsi->da9052->dev,
+			"Failed to register %s IRQ %d, error = %d\n", "TSIRDY",
+			tsi->da9052->irq_base + tsi->irq_datardy, ret);
+		goto err_pendwn_irq;
+	}
+
+	ret = da9052_configure_tsi(tsi);
+	if (ret < 0)
+		goto err_datardy_irq;
+
+	ret = input_register_device(tsi->dev);
+	if (ret < 0)
+		goto err_datardy_irq;
+
+	platform_set_drvdata(pdev, tsi);
+
+	return 0;
+
+err_datardy_irq:
+	free_irq(tsi->da9052->irq_base + tsi->irq_datardy, tsi);
+err_pendwn_irq:
+	free_irq(tsi->da9052->irq_base + tsi->irq_pendwn, tsi);
+err_input:
+	input_free_device(input_dev);
+err_mem:
+	kfree(tsi);
+	return ret;
+}
+
+static int  __devexit da9052_ts_remove(struct platform_device *pdev)
+{
+	struct da9052_tsi *tsi = platform_get_drvdata(pdev);
+
+	da9052_reg_write(tsi->da9052, DA9052_LDO9_REG, 0x19);
+
+	free_irq(tsi->da9052->irq_base + tsi->irq_pendwn, tsi);
+	free_irq(tsi->da9052->irq_base + tsi->irq_datardy, tsi);
+
+	input_unregister_device(tsi->dev);
+
+	platform_set_drvdata(pdev, NULL);
+
+	kfree(tsi);
+
+	return 0;
+}
+
+static struct platform_driver da9052_tsi_driver = {
+
+	.probe = da9052_ts_probe,
+	.remove = __devexit_p(da9052_ts_remove),
+	.driver = {
+		.name = "da9052-tsi",
+		.owner = THIS_MODULE,
+	},
+};
+
+static int __init da9052_ts_init(void)
+{
+	return platform_driver_register(&da9052_tsi_driver);
+}
+module_init(da9052_ts_init);
+
+static void __exit da9052_ts_exit(void)
+{
+	platform_driver_unregister(&da9052_tsi_driver);
+}
+module_exit(da9052_ts_exit);
+
+MODULE_DESCRIPTION("Touchscreen driver for Dialog Semiconductor DA9052");
+MODULE_AUTHOR("David Dajun Chen <dchen@xxxxxxxxxxx>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:da9052-tsi");


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