path: root/packages/linux/linux-ezx-2.6.21/patches/pcap-ts.patch

Index: linux-2.6.21/drivers/input/touchscreen/Kconfig
===================================================================
--- linux-2.6.21.orig/drivers/input/touchscreen/Kconfig	2007-08-31 22:27:48.000000000 -0300
+++ linux-2.6.21/drivers/input/touchscreen/Kconfig	2007-08-31 23:06:39.000000000 -0300
@@ -164,4 +164,13 @@
 	  To compile this driver as a module, choose M here: the
 	  module will be called ucb1400_ts.
 
+config TOUCHSCREEN_PCAP
+	tristate "Motorola PCAP touchscreen"
+	depends on EZX_PCAP
+	help
+	  Say Y here if you have a Motorola EZX telephone and
+	  want to support the built-in touchscreen.
+
+	  If unsure, say N.
+
 endif
Index: linux-2.6.21/drivers/input/touchscreen/pcap_ts.c
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.21/drivers/input/touchscreen/pcap_ts.c	2007-08-31 23:57:56.000000000 -0300
@@ -0,0 +1,331 @@
+/*
+ * pcap_ts.c - Touchscreen driver for Motorola PCAP2 based touchscreen as found
+ * 	       in the EZX phone platform.
+ *
+ *  Copyright (C) 2006 Harald Welte <laforge@openezx.org>
+ *  Copyright (C) 2007 Daniel Ribeiro <drwyrm@gmail.com>
+ *
+ *  Based on information found in the original Motorola 2.4.x ezx-ts.c driver.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2 as
+ *  published by the Free Software Foundation.
+ *
+ * TODO:
+ * 	split this in a hardirq handler and a tasklet/bh
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/fs.h>
+#include <linux/string.h>
+#include <linux/pm.h>
+#include <linux/timer.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/input.h>
+
+#include <asm/arch/hardware.h>
+#include <asm/arch/pxa-regs.h>
+#include <asm/arch/ezx-pcap.h>
+
+#if 0
+#define DEBUGP(x, args ...) printk(x, ## args)
+#else
+#define DEBUGP(x, args ...)
+#endif
+
+#define POSITION_X_MEASUREMENT	0
+#define POSITION_XY_MEASUREMENT	1
+#define PRESSURE_MEASUREMENT	2
+#define PLATE_X_MEASUREMENT	3
+#define PLATE_Y_MEASUREMENT	4
+#define STANDBY_MODE		5
+#define NONTS_MODE		6
+
+struct pcap_ts {
+	int irq_xy;
+	int irq_touch;
+	struct input_dev *input;
+	struct timer_list timer;
+	u_int16_t x, y;
+	u_int16_t pressure;
+	u_int8_t read_state;
+};
+
+#define X_AXIS_MIN	0
+#define X_AXIS_MAX	1023
+
+#define Y_AXIS_MAX	X_AXIS_MAX
+#define Y_AXIS_MIN	X_AXIS_MIN
+
+#define PRESSURE_MAX	X_AXIS_MAX
+#define PRESSURE_MIN	X_AXIS_MIN
+
+/* if we try to read faster, pressure reading becomes unreliable */
+#define SAMPLE_INTERVAL		(HZ/50)
+
+
+static void pcap_ts_mode(struct pcap_ts *pcap_ts, u_int32_t mode)
+{
+	u_int32_t tmp;
+
+	pcap_ts->read_state = mode;
+	ezx_pcap_read(PCAP_REG_ADC1, &tmp);
+	tmp &= ~PCAP_ADC1_TS_M_MASK;
+	tmp |= ((mode << PCAP_ADC1_TS_M_SHIFT) & PCAP_ADC1_TS_M_MASK);
+	ezx_pcap_write(PCAP_REG_ADC1, tmp);
+}
+
+/* issue a XY read command to the ADC of PCAP2.  Well get an ADCDONE interrupt
+ * once the result of the conversion is available */
+static void pcap_ts_start_xy_read(struct pcap_ts *pcap_ts)
+{
+	u_int32_t tmp;
+
+	ezx_pcap_read(PCAP_REG_ADC1, &tmp);
+	tmp &= ~(PCAP_BIT_ADC1_RAND | PCAP_ADC1_ADA1_MASK |
+					PCAP_ADC1_ADA2_MASK);
+	tmp |= (PCAP_BIT_ADC1_ADEN | PCAP_BIT_ADC1_AD_SEL1 |
+		PCAP_BIT_ADC1_AD_SEL2 | (5 << PCAP_ADC1_ADA1_SHIFT) |
+					(3 << PCAP_ADC1_ADA2_SHIFT));
+	ezx_pcap_write(PCAP_REG_ADC1, tmp);
+	ezx_pcap_bit_set(PCAP_BIT_ADC2_ASC, 1);
+}
+
+/* read the XY result from the ADC of PCAP2 */
+static void pcap_ts_get_xy_value(struct pcap_ts *pcap_ts)
+{
+	u_int32_t tmp;
+
+	ezx_pcap_read(PCAP_REG_ADC2, &tmp);
+
+	if (pcap_ts->read_state == POSITION_XY_MEASUREMENT) {
+		pcap_ts->x = (tmp & PCAP_ADC2_ADD1_MASK) >>
+					PCAP_ADC2_ADD1_SHIFT;
+		pcap_ts->y = (tmp & PCAP_ADC2_ADD2_MASK) >>
+					PCAP_ADC2_ADD2_SHIFT;
+	} else {
+		pcap_ts->pressure = (tmp & PCAP_ADC2_ADD2_MASK) >>
+						PCAP_ADC2_ADD2_SHIFT;
+	}
+}
+
+/* PCAP2 interrupts us when ADC conversion result is available */
+static irqreturn_t pcap_ts_irq_xy(int irq, void *dev_id)
+{
+	struct pcap_ts *pcap_ts = dev_id;
+
+	pcap_ts_get_xy_value(pcap_ts);
+	DEBUGP(KERN_DEBUG "%s X=%4d, Y=%4d Z=%4d ",
+		pcap_ts->read_state == POSITION_XY_MEASUREMENT ? "COORD" :
+			"PRESS", pcap_ts->x, pcap_ts->y, pcap_ts->pressure);
+	switch (pcap_ts->read_state) {
+	case PRESSURE_MEASUREMENT:
+		if (pcap_ts->pressure >= PRESSURE_MAX ||
+		     pcap_ts->pressure <= PRESSURE_MIN ) {
+			/* pen has been released (or cant read pressure - WM)*/
+			DEBUGP("UP\n");
+			/* do nothing */
+		} else {
+			/* pen has been touched down */
+			DEBUGP("DOWN\n");
+			input_report_key(pcap_ts->input, BTN_TOUCH, 1);
+			input_report_abs(pcap_ts->input, ABS_PRESSURE, pcap_ts->pressure);
+		}
+		/* switch state machine into coordinate read mode */
+		pcap_ts_mode(pcap_ts, POSITION_XY_MEASUREMENT);
+		pcap_ts_start_xy_read(pcap_ts);
+		break;
+	case POSITION_XY_MEASUREMENT:
+		if (pcap_ts->x <= X_AXIS_MIN || pcap_ts->x >= X_AXIS_MAX ||
+		    pcap_ts->y <= Y_AXIS_MIN || pcap_ts->y >= Y_AXIS_MAX) {
+			/* pen has been released */
+			DEBUGP("UP END\n");
+
+			input_report_key(pcap_ts->input, BTN_TOUCH, 0);
+			input_report_abs(pcap_ts->input, ABS_PRESSURE, 0);
+
+			/* no need for timer, we'll get interrupted with
+			 * next touch down event */
+			del_timer(&pcap_ts->timer);
+
+			/* ask PCAP2 to interrupt us if touch event happens
+			 * again */
+			pcap_ts_mode(pcap_ts, STANDBY_MODE);
+			enable_irq(pcap_ts->irq_touch);
+		} else {
+			DEBUGP("DOWN\n");
+			input_report_abs(pcap_ts->input, ABS_X, pcap_ts->x);
+			input_report_abs(pcap_ts->input, ABS_Y, pcap_ts->y);
+
+			/* switch back to pressure read mode */
+			pcap_ts_mode(pcap_ts, PRESSURE_MEASUREMENT);
+			mod_timer(&pcap_ts->timer, jiffies + SAMPLE_INTERVAL);
+		}
+		input_sync(pcap_ts->input);
+		break;
+	default:
+		DEBUGP("ERROR\n");
+		break;
+	}
+	return IRQ_HANDLED;
+}
+
+/* PCAP2 interrupts us if the pen touches down (interrupts also on pen up - WM)*/
+static irqreturn_t pcap_ts_irq_touch(int irq, void *dev_id)
+{
+	struct pcap_ts *pcap_ts = dev_id;
+	/* mask Touchscreen interrupt bit, prevents further touch events
+	 * from being reported to us until we're finished with reading
+	 * both pressure and x/y from ADC */
+	disable_irq(pcap_ts->irq_touch);
+
+	DEBUGP("touched!!\n");
+	pcap_ts_mode(pcap_ts, PRESSURE_MEASUREMENT);
+	pcap_ts_start_xy_read(pcap_ts);
+	return IRQ_HANDLED;
+}
+
+static void pcap_ts_timer_fn(unsigned long data)
+{
+	struct pcap_ts *pcap_ts = (struct pcap_ts *) data;
+
+	pcap_ts_start_xy_read(pcap_ts);
+}
+
+static int __init ezxts_probe(struct platform_device *pdev)
+{
+	struct pcap_ts *pcap_ts;
+	struct input_dev *input_dev;
+	int err = -ENOMEM;
+
+	pcap_ts = kzalloc(sizeof(*pcap_ts), GFP_KERNEL);
+	input_dev = input_allocate_device();
+	if (!pcap_ts || !input_dev)
+		goto fail;
+
+	pcap_ts->irq_xy = platform_get_irq(pdev, 0);
+	if (pcap_ts->irq_xy < 0) {
+		err = pcap_ts->irq_xy;
+		goto fail;
+	}
+
+	pcap_ts->irq_touch = platform_get_irq(pdev, 1);
+	if (pcap_ts->irq_touch < 0) {
+		err = pcap_ts->irq_touch;
+		goto fail;
+	}
+
+	ezx_pcap_bit_set(PCAP_BIT_ADC1_TS_REFENB, 0);
+	pcap_ts_mode(pcap_ts, STANDBY_MODE);
+
+	err = request_irq(pcap_ts->irq_xy, pcap_ts_irq_xy, SA_INTERRUPT,
+			  "pcap-ts X/Y", pcap_ts);
+	if (err < 0) {
+		printk(KERN_ERR "pcap_ts: can't grab xy irq %d: %d\n",
+		       pcap_ts->irq_xy, err);
+		goto fail;
+	}
+
+	err = request_irq(pcap_ts->irq_touch, pcap_ts_irq_touch, SA_INTERRUPT,
+			  "pcap-ts touch", pcap_ts);
+	if (err < 0) {
+		printk(KERN_ERR "pcap_ts: can't grab touch irq %d: %d\n",
+		       pcap_ts->irq_touch, err);
+		goto fail_xy;
+	}
+
+	pcap_ts->input = input_dev;
+	init_timer(&pcap_ts->timer);
+	pcap_ts->timer.data = (unsigned long) pcap_ts;
+	pcap_ts->timer.function = &pcap_ts_timer_fn;
+
+	platform_set_drvdata(pdev, pcap_ts);
+
+	input_dev->name = "pcap-touchscreen";
+	input_dev->phys = "ezxts/input0";
+	input_dev->id.bustype = BUS_HOST;
+	input_dev->id.vendor = 0x0001;
+	input_dev->id.product = 0x0002;
+	input_dev->id.version = 0x0100;
+	input_dev->cdev.dev = &pdev->dev;
+	input_dev->private = pcap_ts;
+
+	input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
+	input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
+	input_set_abs_params(input_dev, ABS_X, X_AXIS_MIN, X_AXIS_MAX, 0, 0);
+	input_set_abs_params(input_dev, ABS_Y, Y_AXIS_MIN, Y_AXIS_MAX, 0, 0);
+	input_set_abs_params(input_dev, ABS_PRESSURE, PRESSURE_MIN,
+			     PRESSURE_MAX, 0, 0);
+
+	input_register_device(pcap_ts->input);
+
+	return 0;
+
+fail_xy:
+	free_irq(pcap_ts->irq_xy, pcap_ts);
+fail:
+	input_free_device(input_dev);
+	kfree(pcap_ts);
+
+	return err;
+}
+
+static int ezxts_remove(struct platform_device *pdev)
+{
+	struct pcap_ts *pcap_ts = platform_get_drvdata(pdev);
+
+	del_timer_sync(&pcap_ts->timer);
+
+	free_irq(pcap_ts->irq_touch, pcap_ts);
+	free_irq(pcap_ts->irq_xy, pcap_ts);
+
+	input_unregister_device(pcap_ts->input);
+	kfree(pcap_ts);
+
+	return 0;
+}
+
+static int ezxts_suspend(struct platform_device *dev, pm_message_t state)
+{
+	ezx_pcap_bit_set(PCAP_BIT_ADC1_TS_REF_LOWPWR, 1);
+        return 0;
+}
+
+static int ezxts_resume(struct platform_device *dev)
+{
+	ezx_pcap_bit_set(PCAP_BIT_ADC1_TS_REF_LOWPWR, 0);
+	/* just in case we suspend with TSI masked. */
+//	ezx_pcap_bit_set(PCAP_BIT_MSR_TSM, 0);
+        return 0;
+}
+
+
+static struct platform_driver ezxts_driver = {
+	.probe		= ezxts_probe,
+	.remove		= ezxts_remove,
+	.suspend	= ezxts_suspend,
+	.resume		= ezxts_resume,
+	.driver		= {
+		.name	= "pcap-ts",
+		.owner	= THIS_MODULE,
+	},
+};
+
+static int __init ezxts_init(void)
+{
+	return platform_driver_register(&ezxts_driver);
+}
+
+static void __exit ezxts_exit(void)
+{
+	platform_driver_unregister(&ezxts_driver);
+}
+
+module_init(ezxts_init);
+module_exit(ezxts_exit);
+
+MODULE_DESCRIPTION("Motorola PCAP2 touchscreen driver");
+MODULE_AUTHOR("Harald Welte <laforge@openezx.org>");
+MODULE_LICENSE("GPL");
Index: linux-2.6.21/drivers/input/touchscreen/Makefile
===================================================================
--- linux-2.6.21.orig/drivers/input/touchscreen/Makefile	2007-08-31 22:27:48.000000000 -0300
+++ linux-2.6.21/drivers/input/touchscreen/Makefile	2007-08-31 23:06:39.000000000 -0300
@@ -16,3 +16,4 @@
 obj-$(CONFIG_TOUCHSCREEN_TOUCHRIGHT)	+= touchright.o
 obj-$(CONFIG_TOUCHSCREEN_TOUCHWIN)	+= touchwin.o
 obj-$(CONFIG_TOUCHSCREEN_UCB1400)	+= ucb1400_ts.o
+obj-$(CONFIG_TOUCHSCREEN_PCAP) += pcap_ts.o