summaryrefslogtreecommitdiff
path: root/arch/mips/au1000/db1x00/mirage_ts.c
blob: 0942dcf69518806312e4aa702abd774956de6da4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
/*
 * linux/arch/mips/au1000/db1x00/mirage_ts.c
 *
 * BRIEF MODULE DESCRIPTION
 *	Glue between Mirage board-specific touchscreen pieces
 *	and generic Wolfson Codec touchscreen support.
 *
 *	Based on pb1100_ts.c used in Hydrogen II.
 *
 * Copyright (c) 2003 Embedded Edge, LLC
 *		dan@embeddededge.com
 *
 *  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.
 *
 *  THIS  SOFTWARE  IS PROVIDED	  ``AS	IS'' AND   ANY	EXPRESS OR IMPLIED
 *  WARRANTIES,	  INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
 *  NO	EVENT  SHALL   THE AUTHOR  BE	 LIABLE FOR ANY	  DIRECT, INDIRECT,
 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 *  NOT LIMITED	  TO, PROCUREMENT OF  SUBSTITUTE GOODS	OR SERVICES; LOSS OF
 *  USE, DATA,	OR PROFITS; OR	BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 *  ANY THEORY OF LIABILITY, WHETHER IN	 CONTRACT, STRICT LIABILITY, OR TORT
 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *  You should have received a copy of the  GNU General Public License along
 *  with this program; if not, write  to the Free Software Foundation, Inc.,
 *  675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/types.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/poll.h>
#include <linux/proc_fs.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/wait.h>

#include <asm/segment.h>
#include <asm/irq.h>
#include <asm/uaccess.h>
#include <asm/delay.h>
#include <asm/au1000.h>

/*
 *  Imported interface to Wolfson Codec driver.
 */
extern void *wm97xx_ts_get_handle(int which);
extern int wm97xx_ts_ready(void* ts_handle);
extern void wm97xx_ts_set_cal(void* ts_handle, int xscale, int xtrans, int yscale, int ytrans);
extern u16 wm97xx_ts_get_ac97(void* ts_handle, u8 reg);
extern void wm97xx_ts_set_ac97(void* ts_handle, u8 reg, u16 val);
extern int wm97xx_ts_read_data(void* ts_handle, long* x, long* y, long* pressure);
extern void wm97xx_ts_send_data(void* ts_handle, long x, long y, long z);

int wm97xx_comodule_present = 1;


#define TS_NAME "mirage_ts"

#define err(format, arg...) printk(KERN_ERR TS_NAME ": " format "\n" , ## arg)
#define info(format, arg...) printk(KERN_INFO TS_NAME ": " format "\n" , ## arg)
#define warn(format, arg...) printk(KERN_WARNING TS_NAME ": " format "\n" , ## arg)
#define DPRINTK(format, arg...) printk("%s: " format "\n", __FUNCTION__ , ## arg)


#define PEN_DOWN_IRQ	AU1000_GPIO_7

static struct task_struct *ts_task = 0;
static DECLARE_COMPLETION(ts_complete);
static DECLARE_WAIT_QUEUE_HEAD(pendown_wait);

#ifdef CONFIG_WM97XX_FIVEWIRETS
static int release_pressure = 1;
#else
static int release_pressure = 50;
#endif

typedef struct {
   long x;
   long y;
} DOWN_EVENT;

#define SAMPLE_RATE	50	/* samples per second */
#define PEN_DEBOUNCE	5	/* samples for settling - fn of SAMPLE_RATE */
#define PEN_UP_TIMEOUT	10	/* in seconds */
#define PEN_UP_SETTLE	5	/* samples per second */

static struct {
	int xscale;
	int xtrans;
	int yscale;
	int ytrans;
} mirage_ts_cal =
{
#if 0
	.xscale   = 84,
	.xtrans = -157,
	.yscale   = 66,
	.ytrans = -150,
#else
	.xscale   = 84,
	.xtrans = -150,
	.yscale   = 66,
	.ytrans = -146,
#endif
};


static void pendown_irq(int irqnr, void *devid, struct pt_regs *regs)
{
//DPRINTK("got one 0x%x", au_readl(SYS_PINSTATERD));
	wake_up(&pendown_wait);
}

static int ts_thread(void *id)
{
	static int pen_was_down = 0;
	static DOWN_EVENT pen_xy;
	long x, y, z;
	void *ts;	/* handle */
	struct task_struct *tsk = current;
	int timeout = HZ / SAMPLE_RATE;

	ts_task = tsk;

	daemonize();
	tsk->tty = NULL;
	tsk->policy = SCHED_FIFO;
	tsk->rt_priority = 1;
	strcpy(tsk->comm, "touchscreen");

	/* only want to receive SIGKILL */
	spin_lock_irq(&tsk->sigmask_lock);
	siginitsetinv(&tsk->blocked, sigmask(SIGKILL));
	recalc_sigpending(tsk);
	spin_unlock_irq(&tsk->sigmask_lock);

	/* get handle for codec */
	ts = wm97xx_ts_get_handle(0);

	/* proceed only after everybody is ready */
	wait_event_timeout(pendown_wait, wm97xx_ts_ready(ts), HZ/4);

	/* board-specific calibration */
	wm97xx_ts_set_cal(ts,
			mirage_ts_cal.xscale,
			mirage_ts_cal.xtrans,
			mirage_ts_cal.yscale,
			mirage_ts_cal.ytrans);

	/* route Wolfson pendown interrupts to our GPIO */
	au_sync();
	wm97xx_ts_set_ac97(ts, 0x4c, wm97xx_ts_get_ac97(ts, 0x4c) & ~0x0008);
	au_sync();
	wm97xx_ts_set_ac97(ts, 0x56, wm97xx_ts_get_ac97(ts, 0x56) & ~0x0008);
	au_sync();
	wm97xx_ts_set_ac97(ts, 0x52, wm97xx_ts_get_ac97(ts, 0x52) | 0x2008);
	au_sync();

	for (;;) {
		interruptible_sleep_on_timeout(&pendown_wait, timeout);
		disable_irq(PEN_DOWN_IRQ);
		if (signal_pending(tsk)) {
			break;
		}

		/* read codec */
		if (!wm97xx_ts_read_data(ts, &x, &y, &z))
			z = 0;	/* treat no-data and pen-up the same */

		if (signal_pending(tsk)) {
			break;
		}

		if (z >= release_pressure) {
			y = ~y;	/* top to bottom */
			if (pen_was_down > 1 /*&& pen_was_down < PEN_DEBOUNCE*/) {//THXXX
				/* bounce ? */
				x = pen_xy.x;
				y = pen_xy.y;
				--pen_was_down;
			} else if (pen_was_down <= 1) {
				pen_xy.x = x;
				pen_xy.y = y;
				if (pen_was_down)
					wm97xx_ts_send_data(ts, x, y, z);
				pen_was_down = PEN_DEBOUNCE;
			}
			//wm97xx_ts_send_data(ts, x, y, z);
			timeout = HZ / SAMPLE_RATE;
		} else {
			if (pen_was_down) {
				if (--pen_was_down)
					z = release_pressure;
				else //THXXX
				wm97xx_ts_send_data(ts, pen_xy.x, pen_xy.y, z);
			}
			/* The pendown signal takes some time to settle after
			 * reading the pen pressure so wait a little
			 * before enabling the pen.
			 */
			if (! pen_was_down) {
//				interruptible_sleep_on_timeout(&pendown_wait, HZ / PEN_UP_SETTLE);
				timeout = HZ * PEN_UP_TIMEOUT;
			}
		}
		enable_irq(PEN_DOWN_IRQ);
	}
	enable_irq(PEN_DOWN_IRQ);
	ts_task = NULL;
	complete(&ts_complete);
	return 0;
}

static int __init ts_mirage_init(void)
{
	int ret;

	/* pen down signal is connected to GPIO 7 */

	ret = request_irq(PEN_DOWN_IRQ, pendown_irq, 0, "ts-pendown", NULL);
	if (ret) {
		err("unable to get pendown irq%d: [%d]", PEN_DOWN_IRQ, ret);
		return ret;
	}

	lock_kernel();
	ret = kernel_thread(ts_thread, NULL, CLONE_FS | CLONE_FILES);
	if (ret < 0) {
		unlock_kernel();
		return ret;
	}
	unlock_kernel();

	info("Mirage touchscreen IRQ initialized.");

	return 0;
}

static void __exit ts_mirage_exit(void)
{
	if (ts_task) {
		send_sig(SIGKILL, ts_task, 1);
		wait_for_completion(&ts_complete);
	}

	free_irq(PEN_DOWN_IRQ, NULL);
}

module_init(ts_mirage_init);
module_exit(ts_mirage_exit);