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Date:	Wed, 27 Jun 2007 16:43:39 +0200
From:	Pavel Machek <pavel@....cz>
To:	rpurdie@...ys.net, lenz@...wisc.edu,
	kernel list <linux-kernel@...r.kernel.org>,
	Russell King <rmk@....linux.org.uk>, Dirk@...er-Online.de,
	arminlitzel@....de, pavel.urban@...cz,
	metan@...ey.karlin.mff.cuni.cz, thommycheck@...il.com,
	milan@....cz, patches@....linux.org.uk
Subject: [PATCH] touchscreen support for collie (sharp zaurus sl-5500)


Add driver for collie touchscreen, partly based on ucb1x00-ts.c, but
this one actually works.

From: Cyril Hrubis <metan@...ey.karlin.mff.cuni.cz>
Signed-off-by: Pavel Machek <pavel@....cz>

PATCH FOLLOWS
KernelVersion: 2.6.22-rc6-git

---
commit 2a18a9f134617ceacccb7f15fe1c383715dc769a
tree 04f026730fc0b96b749cb6a629db87d3e5f96fc7
parent a4df00d46ea436724a07da7c180bdfca2162ea98
author Pavel <pavel@....ucw.cz> Wed, 27 Jun 2007 16:40:25 +0200
committer Pavel <pavel@....ucw.cz> Wed, 27 Jun 2007 16:40:25 +0200

 drivers/mfd/Kconfig     |    6 +
 drivers/mfd/Makefile    |    1 
 drivers/mfd/collie-ts.c |  449 +++++++++++++++++++++++++++++++++++++++++++++++
 drivers/mfd/ucb1x00.h   |    3 
 4 files changed, 459 insertions(+), 0 deletions(-)

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 56576ba..e8d5668 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -42,4 +42,10 @@ config MCP_UCB1200_TS
 	tristate "Touchscreen interface support"
 	depends on MCP_UCB1200 && INPUT
 
+config MCP_COLLIE_TS
+	tristate "Touchscreen collie support"
+	depends on MCP_UCB1200 && INPUT && !MCP_UCB1200_TS
+	 ---help---
+	  Driver for touchscreen on collie - sharp sl-5500.
+
 endmenu
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 8f3cb8b..64b3c4c 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -9,6 +9,7 @@ obj-$(CONFIG_MCP_SA11X0)	+= mcp-sa11x0.o
 obj-$(CONFIG_MCP_UCB1200)	+= ucb1x00-core.o
 obj-$(CONFIG_MCP_UCB1200_TS)	+= ucb1x00-ts.o
 obj-$(CONFIG_MCP_UCB1200_AUDIO)	+= ucb1x00-audio.o
+obj-$(CONFIG_MCP_COLLIE_TS)     += collie-ts.o
  
 ifeq ($(CONFIG_SA1100_ASSABET),y)
 obj-$(CONFIG_MCP_UCB1200)	+= ucb1x00-assabet.o
diff --git a/drivers/mfd/collie-ts.c b/drivers/mfd/collie-ts.c
new file mode 100644
index 0000000..759f03a
--- /dev/null
+++ b/drivers/mfd/collie-ts.c
@@ -0,0 +1,449 @@
+/*
+ *  Touchscreen driver for UCB1x00-based touchscreens
+ *
+ *  Copyright (C) 2001 Russell King, All Rights Reserved.
+ *  Copyright (C) 2005 Pavel Machek
+ *
+ * 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.
+ *
+ * 21-Jan-2002 <jco@....es> :
+ *
+ * Added support for synchronous A/D mode. This mode is useful to
+ * avoid noise induced in the touchpanel by the LCD, provided that
+ * the UCB1x00 has a valid LCD sync signal routed to its ADCSYNC pin.
+ * It is important to note that the signal connected to the ADCSYNC
+ * pin should provide pulses even when the LCD is blanked, otherwise
+ * a pen touch needed to unblank the LCD will never be read.
+ */
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/init.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+#include <linux/sched.h>
+#include <linux/completion.h>
+#include <linux/delay.h>
+#include <linux/string.h>
+#include <linux/input.h>
+#include <linux/device.h>
+#include <linux/freezer.h>
+#include <linux/slab.h>
+#include <linux/kthread.h>
+
+#include <asm/dma.h>
+#include <asm/semaphore.h>
+#include <asm/arch/collie.h>
+#include <asm/mach-types.h>
+
+#include "ucb1x00.h"
+
+struct ucb1x00_ts {
+	struct input_dev	*idev;
+	struct ucb1x00		*ucb;
+
+	wait_queue_head_t	irq_wait;
+	struct task_struct	*rtask;
+	u16			x_res;
+	u16			y_res;
+
+	unsigned int		adcsync:1;
+};
+
+static int adcsync;
+
+/**********************************
+
+     ................
+     .              . = 340
+     .              .
+     .             ^.
+     .             ^.
+     .             ^.
+     .             ^.
+     .              .
+     .             X. = 10
+     .  <<<<<<<<  Y .
+     ................
+     .   Sharp    =200
+     .              .
+     .  -   O    -  .
+     .              .
+     ................
+
+**********************************/
+
+
+static inline void ucb1x00_ts_evt_add(struct ucb1x00_ts *ts, u16 pressure, u16 x, u16 y)
+{
+	struct input_dev *idev = ts->idev;
+
+	input_report_abs(idev, ABS_X, x);
+	input_report_abs(idev, ABS_Y, y);
+	input_report_abs(idev, ABS_PRESSURE, pressure);
+        input_report_key(idev, BTN_TOUCH, 1);
+	input_sync(idev);
+}
+
+static inline void ucb1x00_ts_event_release(struct ucb1x00_ts *ts)
+{
+	struct input_dev *idev = ts->idev;
+
+	input_report_abs(idev, ABS_PRESSURE, 0);
+        input_report_key(idev, BTN_TOUCH, 0);
+	input_sync(idev);
+}
+
+/*
+ * Switch to interrupt mode. This set touchscreen to interrupt 
+ * mode, so that chip is able to send interrupt.
+ */
+static inline void ucb1x00_ts_mode_int(struct ucb1x00_ts *ts)
+{
+	ucb1x00_reg_write(ts->ucb, UCB_TS_CR,
+			UCB_TS_CR_TSMX_POW | UCB_TS_CR_TSPX_POW |
+			UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_GND |
+			UCB_TS_CR_MODE_INT);
+}
+
+/*
+ * Switch to pressure mode, and read pressure.  We don't need to wait
+ * here, since both plates are being driven.
+ *
+ * set_read_pressure() in sharp code
+ */
+static inline void ucb1x00_ts_read_pressure(struct ucb1x00_ts *ts)
+{
+	ucb1x00_io_write(ts->ucb, COLLIE_TC35143_GPIO_TBL_CHK, 0);
+	ucb1x00_reg_write(ts->ucb, UCB_TS_CR,
+			  UCB_TS_CR_TSPX_POW | UCB_TS_CR_TSMX_POW |
+			  UCB_TS_CR_MODE_POS | UCB_TS_CR_BIAS_ENA);
+
+	ucb1x00_reg_write(ts->ucb, UCB_ADC_CR, ts->ucb->adc_cr | 
+			  UCB_ADC_INP_AD2 | 
+			  UCB_ADC_SYNC_ENA);
+	udelay(100);
+	ucb1x00_reg_write(ts->ucb, UCB_ADC_CR, ts->ucb->adc_cr | 
+			  UCB_ADC_INP_AD2 | 
+			  UCB_ADC_SYNC_ENA | UCB_ADC_START);
+}
+
+/*
+ * Switch to X position mode and measure Y plate.  We switch the plate
+ * configuration in pressure mode, then switch to position mode.  This
+ * gives a faster response time.  Even so, we need to wait about 55us
+ * for things to stabilise.
+ */
+static inline void ucb1x00_ts_read_xpos(struct ucb1x00_ts *ts)
+{
+	ucb1x00_io_write(ts->ucb, 0, COLLIE_TC35143_GPIO_TBL_CHK);
+	ucb1x00_reg_write(ts->ucb, UCB_TS_CR,
+			UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW |
+			UCB_TS_CR_MODE_POS | UCB_TS_CR_BIAS_ENA);
+
+
+	ucb1x00_reg_write(ts->ucb, UCB_ADC_CR, ts->ucb->adc_cr | 
+			  UCB_ADC_INP_TSPY | UCB_ADC_SYNC_ENA);
+	udelay(100);
+	ucb1x00_reg_write(ts->ucb, UCB_ADC_CR, ts->ucb->adc_cr | 
+			  UCB_ADC_INP_TSPY | UCB_ADC_SYNC_ENA | 
+		 	  UCB_ADC_START);
+}
+
+/*
+ * Switch to Y position mode and measure X plate.  We switch the plate
+ * configuration in pressure mode, then switch to position mode.  This
+ * gives a faster response time.  Even so, we need to wait about 55us
+ * for things to stabilise.
+ */
+static inline void ucb1x00_ts_read_ypos(struct ucb1x00_ts *ts)
+{
+	ucb1x00_io_write(ts->ucb, 0, COLLIE_TC35143_GPIO_TBL_CHK);
+
+	ucb1x00_reg_write(ts->ucb, UCB_TS_CR,
+			UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_POW |
+			UCB_TS_CR_MODE_POS | UCB_TS_CR_BIAS_ENA);
+
+
+	ucb1x00_reg_write(ts->ucb, UCB_ADC_CR, ts->ucb->adc_cr | 
+			  UCB_ADC_INP_TSPX | UCB_ADC_SYNC_ENA);
+	udelay(100);
+	ucb1x00_reg_write(ts->ucb, UCB_ADC_CR, ts->ucb->adc_cr |
+			  UCB_ADC_INP_TSPX | UCB_ADC_SYNC_ENA | 
+			  UCB_ADC_START);
+}
+
+/*
+ * Switch to X plate resistance mode.  Set MX to ground, PX to
+ * supply.  Measure current.
+ */
+static inline unsigned int ucb1x00_ts_read_xres(struct ucb1x00_ts *ts)
+{
+	ucb1x00_reg_write(ts->ucb, UCB_TS_CR,
+			UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW |
+			UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
+	return ucb1x00_adc_read(ts->ucb, 0, ts->adcsync);
+}
+
+/*
+ * Switch to Y plate resistance mode.  Set MY to ground, PY to
+ * supply.  Measure current.
+ */
+static inline unsigned int ucb1x00_ts_read_yres(struct ucb1x00_ts *ts)
+{
+	ucb1x00_reg_write(ts->ucb, UCB_TS_CR,
+			UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_POW |
+			UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
+	return ucb1x00_adc_read(ts->ucb, 0, ts->adcsync);
+}
+
+/*
+ * This is a RT kernel thread that handles the ADC accesses
+ * (mainly so we can use semaphores in the UCB1200 core code
+ * to serialise accesses to the ADC).
+ */
+static int ucb1x00_thread(void *_ts)
+{
+	struct ucb1x00_ts *ts = _ts;
+	struct task_struct *tsk = current;
+	DECLARE_WAITQUEUE(wait, tsk);
+	int state;
+
+	/*
+	 * We could run as a real-time thread.  However, thus far
+	 * this doesn't seem to be necessary.
+	 */
+
+	add_wait_queue(&ts->irq_wait, &wait);	
+
+	while (!kthread_should_stop()) {
+		unsigned int data[3];
+			
+		for (state=0; state<3; state++) {
+			
+			ucb1x00_adc_enable(ts->ucb);
+			ucb1x00_enable_irq(ts->ucb, UCB_IRQ_ADC, UCB_FALLING);
+			switch (state) {
+			/* Order matters here; last measurement seems to be more noisy then the
+			   rest, and we care about pressure least */
+				case 2: ucb1x00_ts_read_pressure(ts);
+					break;
+				case 0: ucb1x00_ts_read_ypos(ts);
+					break;
+				case 1: ucb1x00_ts_read_xpos(ts);
+					break;
+			}
+			/* wait for adc */
+			try_to_freeze();
+			schedule_timeout(1000 * HZ);
+			ucb1x00_disable_irq(ts->ucb, UCB_IRQ_ADC, UCB_FALLING);
+			data[state] = UCB_ADC_DAT(ucb1x00_reg_read(ts->ucb, UCB_ADC_DATA));
+			ucb1x00_adc_disable(ts->ucb);
+		}	
+		
+		/* If not pressed any more, try to sleep! */
+		if (data[2] < 300) {
+			set_task_state(tsk, TASK_INTERRUPTIBLE);
+			ucb1x00_enable_irq(ts->ucb, UCB_IRQ_TSPX, UCB_RISING);
+			ucb1x00_ts_mode_int(ts);
+			ucb1x00_disable(ts->ucb);
+			ucb1x00_ts_event_release(ts);
+			try_to_freeze();
+			schedule_timeout(1000 * HZ);
+			ucb1x00_disable_irq(ts->ucb, UCB_IRQ_TSPX, UCB_RISING);
+			ucb1x00_enable(ts->ucb);
+		} else {	
+			ucb1x00_ts_evt_add(ts, data[2], data[1], data[0]);
+		}
+		ucb1x00_disable(ts->ucb);
+		msleep(20);
+		ucb1x00_enable(ts->ucb);
+	}
+
+	remove_wait_queue(&ts->irq_wait, &wait);
+
+	ts->rtask = NULL;
+	return 0;
+}
+
+/*
+ * We only detect touch screen _touches_ with this interrupt
+ * handler, and even then we just schedule our task.
+ */
+static void ucb1x00_ts_irq(int idx, void *id)
+{
+	struct ucb1x00_ts *ts = id;
+	wake_up(&ts->irq_wait);
+}
+
+static void ucb1x00_adc_irq(int idx, void *id)
+{
+	struct ucb1x00_ts *ts = id;
+	wake_up(&ts->irq_wait);
+}
+
+static int ucb1x00_ts_open(struct input_dev *idev)
+{
+	struct ucb1x00_ts *ts = idev->private;
+	int ret = 0;
+
+	BUG_ON(ts->rtask);
+
+	init_waitqueue_head(&ts->irq_wait);
+	
+	ret = ucb1x00_hook_irq(ts->ucb, UCB_IRQ_TSPX, ucb1x00_ts_irq, ts);
+	if (ret < 0)
+		return ret;
+	
+	ret = ucb1x00_hook_irq(ts->ucb, UCB_IRQ_ADC, ucb1x00_adc_irq, ts);
+	if (ret < 0) {
+		ucb1x00_free_irq(ts->ucb, UCB_IRQ_TSPX, ts);
+		return ret;
+	}
+
+	ucb1x00_enable_irq(ts->ucb, UCB_IRQ_TSPX, UCB_RISING);
+	
+	/*
+	 * If we do this at all, we should allow the user to
+	 * measure and read the X and Y resistance at any time.
+	 */
+	ucb1x00_adc_enable(ts->ucb);
+	ts->x_res = ucb1x00_ts_read_xres(ts);
+	ts->y_res = ucb1x00_ts_read_yres(ts);
+	ucb1x00_adc_disable(ts->ucb);
+
+	if (machine_is_collie()) {
+		ucb1x00_io_set_dir(ts->ucb, 0, COLLIE_TC35143_GPIO_TBL_CHK);
+	}
+
+	ts->rtask = kthread_run(ucb1x00_thread, ts, "ktsd");
+	if (!IS_ERR(ts->rtask)) {
+		ret = 0;
+	} else {
+		ucb1x00_free_irq(ts->ucb, UCB_IRQ_TSPX, ts);
+		ts->rtask = NULL;
+		ret = -EFAULT;
+	}
+	
+	return ret;
+}
+
+/*
+ * Release touchscreen resources.  Disable IRQs.
+ */
+static void ucb1x00_ts_close(struct input_dev *idev)
+{
+	struct ucb1x00_ts *ts = idev->private;
+
+	if (ts->rtask)
+		kthread_stop(ts->rtask);
+
+	ucb1x00_enable(ts->ucb);
+	ucb1x00_free_irq(ts->ucb, UCB_IRQ_TSPX, ts);
+	ucb1x00_free_irq(ts->ucb, UCB_IRQ_ADC, ts);
+	ucb1x00_reg_write(ts->ucb, UCB_TS_CR, 0);
+	ucb1x00_disable(ts->ucb);
+}
+
+#ifdef CONFIG_PM
+static int ucb1x00_ts_resume(struct ucb1x00_dev *dev)
+{
+	struct ucb1x00_ts *ts = dev->priv;
+
+	if (ts->rtask != NULL) {
+		/*
+		 * Restart the TS thread to ensure the
+		 * TS interrupt mode is set up again
+		 * after sleep.
+		 */
+		wake_up(&ts->irq_wait);
+	}
+	return 0;
+}
+#else
+#define ucb1x00_ts_resume NULL
+#endif
+
+
+/*
+ * Initialisation.
+ */
+static int ucb1x00_ts_add(struct ucb1x00_dev *dev)
+{
+	struct ucb1x00_ts *ts;
+	struct input_dev *idev;
+	int err;
+
+	ts = kzalloc(sizeof(struct ucb1x00_ts), GFP_KERNEL);
+	idev = input_allocate_device();
+	if (!ts || !idev) {
+		err = -ENOMEM;
+		goto fail;
+	}
+
+	ts->ucb = dev->ucb;
+	ts->idev = idev;
+	ts->adcsync = adcsync ? UCB_SYNC : UCB_NOSYNC;
+
+	idev->private    = ts;
+	idev->name       = "Touchscreen panel";
+	idev->id.product = ts->ucb->id;
+	idev->open       = ucb1x00_ts_open;
+	idev->close      = ucb1x00_ts_close;
+
+	__set_bit(EV_ABS, idev->evbit);
+	__set_bit(ABS_X, idev->absbit);
+	__set_bit(ABS_Y, idev->absbit);
+	__set_bit(ABS_PRESSURE, idev->absbit);
+
+        input_set_abs_params(ts->idev, ABS_X, 0, 450, 0, 0);
+        input_set_abs_params(ts->idev, ABS_Y, 200, 800, 0, 0);
+        input_set_abs_params(ts->idev, ABS_PRESSURE, 400, 800, 0, 0);
+
+
+	err = input_register_device(idev);
+	if (err)
+		goto fail;
+
+	dev->priv = ts;
+
+	return 0;
+
+ fail:
+	input_free_device(idev);
+	kfree(ts);
+	return err;
+}
+
+static void ucb1x00_ts_remove(struct ucb1x00_dev *dev)
+{
+	struct ucb1x00_ts *ts = dev->priv;
+
+	input_unregister_device(ts->idev);
+	kfree(ts);
+}
+
+static struct ucb1x00_driver ucb1x00_ts_driver = {
+	.add		= ucb1x00_ts_add,
+	.remove		= ucb1x00_ts_remove,
+	.resume		= ucb1x00_ts_resume,
+};
+
+static int __init ucb1x00_ts_init(void)
+{
+	return ucb1x00_register_driver(&ucb1x00_ts_driver);
+}
+
+static void __exit ucb1x00_ts_exit(void)
+{
+	ucb1x00_unregister_driver(&ucb1x00_ts_driver);
+}
+
+module_param(adcsync, int, 0444);
+module_init(ucb1x00_ts_init);
+module_exit(ucb1x00_ts_exit);
+
+MODULE_AUTHOR("Russell King <rmk@....linux.org.uk>");
+MODULE_DESCRIPTION("UCB1x00 touchscreen driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/mfd/ucb1x00.h b/drivers/mfd/ucb1x00.h
index ca8df80..81237f5 100644
--- a/drivers/mfd/ucb1x00.h
+++ b/drivers/mfd/ucb1x00.h
@@ -34,7 +34,10 @@ #define UCB_IE_TSMX		(1 << 13)
 #define UCB_IE_TCLIP		(1 << 14)
 #define UCB_IE_ACLIP		(1 << 15)
 
+/* UCB1200 irqs */
+#define UCB_IRQ_ADC		11
 #define UCB_IRQ_TSPX		12
+#define UCB_IRQ_TSMX		13
 
 #define UCB_TC_A	0x05
 #define UCB_TC_A_LOOP		(1 << 7)	/* UCB1200 */

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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