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Diffstat (limited to 'arch/mips/au1000/db1x00/mirage_ts.c')
-rw-r--r--arch/mips/au1000/db1x00/mirage_ts.c261
1 files changed, 261 insertions, 0 deletions
diff --git a/arch/mips/au1000/db1x00/mirage_ts.c b/arch/mips/au1000/db1x00/mirage_ts.c
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1/*
2 * linux/arch/mips/au1000/db1x00/mirage_ts.c
3 *
4 * BRIEF MODULE DESCRIPTION
5 * Glue between Mirage board-specific touchscreen pieces
6 * and generic Wolfson Codec touchscreen support.
7 *
8 * Based on pb1100_ts.c used in Hydrogen II.
9 *
10 * Copyright (c) 2003 Embedded Edge, LLC
11 * dan@embeddededge.com
12 *
13 * This program is free software; you can redistribute it and/or modify it
14 * under the terms of the GNU General Public License as published by the
15 * Free Software Foundation; either version 2 of the License, or (at your
16 * option) any later version.
17 *
18 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
19 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
20 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
21 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
24 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
25 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 *
29 * You should have received a copy of the GNU General Public License along
30 * with this program; if not, write to the Free Software Foundation, Inc.,
31 * 675 Mass Ave, Cambridge, MA 02139, USA.
32 */
33
34#include <linux/config.h>
35#include <linux/types.h>
36#include <linux/module.h>
37#include <linux/sched.h>
38#include <linux/kernel.h>
39#include <linux/init.h>
40#include <linux/fs.h>
41#include <linux/poll.h>
42#include <linux/proc_fs.h>
43#include <linux/smp.h>
44#include <linux/smp_lock.h>
45#include <linux/wait.h>
46
47#include <asm/segment.h>
48#include <asm/irq.h>
49#include <asm/uaccess.h>
50#include <asm/delay.h>
51#include <asm/au1000.h>
52
53/*
54 * Imported interface to Wolfson Codec driver.
55 */
56extern void *wm97xx_ts_get_handle(int which);
57extern int wm97xx_ts_ready(void* ts_handle);
58extern void wm97xx_ts_set_cal(void* ts_handle, int xscale, int xtrans, int yscale, int ytrans);
59extern u16 wm97xx_ts_get_ac97(void* ts_handle, u8 reg);
60extern void wm97xx_ts_set_ac97(void* ts_handle, u8 reg, u16 val);
61extern int wm97xx_ts_read_data(void* ts_handle, long* x, long* y, long* pressure);
62extern void wm97xx_ts_send_data(void* ts_handle, long x, long y, long z);
63
64int wm97xx_comodule_present = 1;
65
66
67#define TS_NAME "mirage_ts"
68
69#define err(format, arg...) printk(KERN_ERR TS_NAME ": " format "\n" , ## arg)
70#define info(format, arg...) printk(KERN_INFO TS_NAME ": " format "\n" , ## arg)
71#define warn(format, arg...) printk(KERN_WARNING TS_NAME ": " format "\n" , ## arg)
72#define DPRINTK(format, arg...) printk("%s: " format "\n", __FUNCTION__ , ## arg)
73
74
75#define PEN_DOWN_IRQ AU1000_GPIO_7
76
77static struct task_struct *ts_task = 0;
78static DECLARE_COMPLETION(ts_complete);
79static DECLARE_WAIT_QUEUE_HEAD(pendown_wait);
80
81#ifdef CONFIG_WM97XX_FIVEWIRETS
82static int release_pressure = 1;
83#else
84static int release_pressure = 50;
85#endif
86
87typedef struct {
88 long x;
89 long y;
90} DOWN_EVENT;
91
92#define SAMPLE_RATE 50 /* samples per second */
93#define PEN_DEBOUNCE 5 /* samples for settling - fn of SAMPLE_RATE */
94#define PEN_UP_TIMEOUT 10 /* in seconds */
95#define PEN_UP_SETTLE 5 /* samples per second */
96
97static struct {
98 int xscale;
99 int xtrans;
100 int yscale;
101 int ytrans;
102} mirage_ts_cal =
103{
104#if 0
105 xscale: 84,
106 xtrans: -157,
107 yscale: 66,
108 ytrans: -150,
109#else
110 xscale: 84,
111 xtrans: -150,
112 yscale: 66,
113 ytrans: -146,
114#endif
115};
116
117
118static void pendown_irq(int irqnr, void *devid, struct pt_regs *regs)
119{
120//DPRINTK("got one 0x%x", au_readl(SYS_PINSTATERD));
121 wake_up(&pendown_wait);
122}
123
124static int ts_thread(void *id)
125{
126 static int pen_was_down = 0;
127 static DOWN_EVENT pen_xy;
128 long x, y, z;
129 void *ts; /* handle */
130 struct task_struct *tsk = current;
131 int timeout = HZ / SAMPLE_RATE;
132
133 ts_task = tsk;
134
135 daemonize();
136 tsk->tty = NULL;
137 tsk->policy = SCHED_FIFO;
138 tsk->rt_priority = 1;
139 strcpy(tsk->comm, "touchscreen");
140
141 /* only want to receive SIGKILL */
142 spin_lock_irq(&tsk->sigmask_lock);
143 siginitsetinv(&tsk->blocked, sigmask(SIGKILL));
144 recalc_sigpending(tsk);
145 spin_unlock_irq(&tsk->sigmask_lock);
146
147 /* get handle for codec */
148 ts = wm97xx_ts_get_handle(0);
149
150 /* proceed only after everybody is ready */
151 wait_event_timeout(pendown_wait, wm97xx_ts_ready(ts), HZ/4);
152
153 /* board-specific calibration */
154 wm97xx_ts_set_cal(ts,
155 mirage_ts_cal.xscale,
156 mirage_ts_cal.xtrans,
157 mirage_ts_cal.yscale,
158 mirage_ts_cal.ytrans);
159
160 /* route Wolfson pendown interrupts to our GPIO */
161 au_sync();
162 wm97xx_ts_set_ac97(ts, 0x4c, wm97xx_ts_get_ac97(ts, 0x4c) & ~0x0008);
163 au_sync();
164 wm97xx_ts_set_ac97(ts, 0x56, wm97xx_ts_get_ac97(ts, 0x56) & ~0x0008);
165 au_sync();
166 wm97xx_ts_set_ac97(ts, 0x52, wm97xx_ts_get_ac97(ts, 0x52) | 0x2008);
167 au_sync();
168
169 for (;;) {
170 interruptible_sleep_on_timeout(&pendown_wait, timeout);
171 disable_irq(PEN_DOWN_IRQ);
172 if (signal_pending(tsk)) {
173 break;
174 }
175
176 /* read codec */
177 if (!wm97xx_ts_read_data(ts, &x, &y, &z))
178 z = 0; /* treat no-data and pen-up the same */
179
180 if (signal_pending(tsk)) {
181 break;
182 }
183
184 if (z >= release_pressure) {
185 y = ~y; /* top to bottom */
186 if (pen_was_down > 1 /*&& pen_was_down < PEN_DEBOUNCE*/) {//THXXX
187 /* bounce ? */
188 x = pen_xy.x;
189 y = pen_xy.y;
190 --pen_was_down;
191 } else if (pen_was_down <= 1) {
192 pen_xy.x = x;
193 pen_xy.y = y;
194 if (pen_was_down)
195 wm97xx_ts_send_data(ts, x, y, z);
196 pen_was_down = PEN_DEBOUNCE;
197 }
198 //wm97xx_ts_send_data(ts, x, y, z);
199 timeout = HZ / SAMPLE_RATE;
200 } else {
201 if (pen_was_down) {
202 if (--pen_was_down)
203 z = release_pressure;
204 else //THXXX
205 wm97xx_ts_send_data(ts, pen_xy.x, pen_xy.y, z);
206 }
207 /* The pendown signal takes some time to settle after
208 * reading the pen pressure so wait a little
209 * before enabling the pen.
210 */
211 if (! pen_was_down) {
212// interruptible_sleep_on_timeout(&pendown_wait, HZ / PEN_UP_SETTLE);
213 timeout = HZ * PEN_UP_TIMEOUT;
214 }
215 }
216 enable_irq(PEN_DOWN_IRQ);
217 }
218 enable_irq(PEN_DOWN_IRQ);
219 ts_task = NULL;
220 complete(&ts_complete);
221 return 0;
222}
223
224static int __init ts_mirage_init(void)
225{
226 int ret;
227
228 /* pen down signal is connected to GPIO 7 */
229
230 ret = request_irq(PEN_DOWN_IRQ, pendown_irq, 0, "ts-pendown", NULL);
231 if (ret) {
232 err("unable to get pendown irq%d: [%d]", PEN_DOWN_IRQ, ret);
233 return ret;
234 }
235
236 lock_kernel();
237 ret = kernel_thread(ts_thread, NULL, CLONE_FS | CLONE_FILES);
238 if (ret < 0) {
239 unlock_kernel();
240 return ret;
241 }
242 unlock_kernel();
243
244 info("Mirage touchscreen IRQ initialized.");
245
246 return 0;
247}
248
249static void __exit ts_mirage_exit(void)
250{
251 if (ts_task) {
252 send_sig(SIGKILL, ts_task, 1);
253 wait_for_completion(&ts_complete);
254 }
255
256 free_irq(PEN_DOWN_IRQ, NULL);
257}
258
259module_init(ts_mirage_init);
260module_exit(ts_mirage_exit);
261
generated by cgit v1.2.2 (git 2.25.0) at 2025-02-27 02:50:57 -0500