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1da177e4 LT |
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 | ||
1da177e4 LT |
34 | #include <linux/types.h> |
35 | #include <linux/module.h> | |
36 | #include <linux/sched.h> | |
37 | #include <linux/kernel.h> | |
38 | #include <linux/init.h> | |
39 | #include <linux/fs.h> | |
40 | #include <linux/poll.h> | |
41 | #include <linux/proc_fs.h> | |
42 | #include <linux/smp.h> | |
43 | #include <linux/smp_lock.h> | |
44 | #include <linux/wait.h> | |
45 | ||
46 | #include <asm/segment.h> | |
47 | #include <asm/irq.h> | |
48 | #include <asm/uaccess.h> | |
49 | #include <asm/delay.h> | |
50 | #include <asm/au1000.h> | |
51 | ||
52 | /* | |
53 | * Imported interface to Wolfson Codec driver. | |
54 | */ | |
55 | extern void *wm97xx_ts_get_handle(int which); | |
56 | extern int wm97xx_ts_ready(void* ts_handle); | |
57 | extern void wm97xx_ts_set_cal(void* ts_handle, int xscale, int xtrans, int yscale, int ytrans); | |
58 | extern u16 wm97xx_ts_get_ac97(void* ts_handle, u8 reg); | |
59 | extern void wm97xx_ts_set_ac97(void* ts_handle, u8 reg, u16 val); | |
60 | extern int wm97xx_ts_read_data(void* ts_handle, long* x, long* y, long* pressure); | |
61 | extern void wm97xx_ts_send_data(void* ts_handle, long x, long y, long z); | |
62 | ||
63 | int wm97xx_comodule_present = 1; | |
64 | ||
65 | ||
66 | #define TS_NAME "mirage_ts" | |
67 | ||
68 | #define err(format, arg...) printk(KERN_ERR TS_NAME ": " format "\n" , ## arg) | |
69 | #define info(format, arg...) printk(KERN_INFO TS_NAME ": " format "\n" , ## arg) | |
70 | #define warn(format, arg...) printk(KERN_WARNING TS_NAME ": " format "\n" , ## arg) | |
71 | #define DPRINTK(format, arg...) printk("%s: " format "\n", __FUNCTION__ , ## arg) | |
72 | ||
73 | ||
74 | #define PEN_DOWN_IRQ AU1000_GPIO_7 | |
75 | ||
76 | static struct task_struct *ts_task = 0; | |
77 | static DECLARE_COMPLETION(ts_complete); | |
78 | static DECLARE_WAIT_QUEUE_HEAD(pendown_wait); | |
79 | ||
80 | #ifdef CONFIG_WM97XX_FIVEWIRETS | |
81 | static int release_pressure = 1; | |
82 | #else | |
83 | static int release_pressure = 50; | |
84 | #endif | |
85 | ||
86 | typedef struct { | |
87 | long x; | |
88 | long y; | |
89 | } DOWN_EVENT; | |
90 | ||
91 | #define SAMPLE_RATE 50 /* samples per second */ | |
92 | #define PEN_DEBOUNCE 5 /* samples for settling - fn of SAMPLE_RATE */ | |
93 | #define PEN_UP_TIMEOUT 10 /* in seconds */ | |
94 | #define PEN_UP_SETTLE 5 /* samples per second */ | |
95 | ||
96 | static struct { | |
97 | int xscale; | |
98 | int xtrans; | |
99 | int yscale; | |
100 | int ytrans; | |
101 | } mirage_ts_cal = | |
102 | { | |
103 | #if 0 | |
0f04afb5 RB |
104 | .xscale = 84, |
105 | .xtrans = -157, | |
106 | .yscale = 66, | |
107 | .ytrans = -150, | |
1da177e4 | 108 | #else |
0f04afb5 RB |
109 | .xscale = 84, |
110 | .xtrans = -150, | |
111 | .yscale = 66, | |
112 | .ytrans = -146, | |
1da177e4 LT |
113 | #endif |
114 | }; | |
115 | ||
116 | ||
117 | static void pendown_irq(int irqnr, void *devid, struct pt_regs *regs) | |
118 | { | |
119 | //DPRINTK("got one 0x%x", au_readl(SYS_PINSTATERD)); | |
120 | wake_up(&pendown_wait); | |
121 | } | |
122 | ||
123 | static int ts_thread(void *id) | |
124 | { | |
125 | static int pen_was_down = 0; | |
126 | static DOWN_EVENT pen_xy; | |
127 | long x, y, z; | |
128 | void *ts; /* handle */ | |
129 | struct task_struct *tsk = current; | |
130 | int timeout = HZ / SAMPLE_RATE; | |
131 | ||
132 | ts_task = tsk; | |
133 | ||
134 | daemonize(); | |
135 | tsk->tty = NULL; | |
136 | tsk->policy = SCHED_FIFO; | |
137 | tsk->rt_priority = 1; | |
138 | strcpy(tsk->comm, "touchscreen"); | |
139 | ||
140 | /* only want to receive SIGKILL */ | |
141 | spin_lock_irq(&tsk->sigmask_lock); | |
142 | siginitsetinv(&tsk->blocked, sigmask(SIGKILL)); | |
143 | recalc_sigpending(tsk); | |
144 | spin_unlock_irq(&tsk->sigmask_lock); | |
145 | ||
146 | /* get handle for codec */ | |
147 | ts = wm97xx_ts_get_handle(0); | |
148 | ||
149 | /* proceed only after everybody is ready */ | |
150 | wait_event_timeout(pendown_wait, wm97xx_ts_ready(ts), HZ/4); | |
151 | ||
152 | /* board-specific calibration */ | |
153 | wm97xx_ts_set_cal(ts, | |
154 | mirage_ts_cal.xscale, | |
155 | mirage_ts_cal.xtrans, | |
156 | mirage_ts_cal.yscale, | |
157 | mirage_ts_cal.ytrans); | |
158 | ||
159 | /* route Wolfson pendown interrupts to our GPIO */ | |
160 | au_sync(); | |
161 | wm97xx_ts_set_ac97(ts, 0x4c, wm97xx_ts_get_ac97(ts, 0x4c) & ~0x0008); | |
162 | au_sync(); | |
163 | wm97xx_ts_set_ac97(ts, 0x56, wm97xx_ts_get_ac97(ts, 0x56) & ~0x0008); | |
164 | au_sync(); | |
165 | wm97xx_ts_set_ac97(ts, 0x52, wm97xx_ts_get_ac97(ts, 0x52) | 0x2008); | |
166 | au_sync(); | |
167 | ||
168 | for (;;) { | |
169 | interruptible_sleep_on_timeout(&pendown_wait, timeout); | |
170 | disable_irq(PEN_DOWN_IRQ); | |
171 | if (signal_pending(tsk)) { | |
172 | break; | |
173 | } | |
174 | ||
175 | /* read codec */ | |
176 | if (!wm97xx_ts_read_data(ts, &x, &y, &z)) | |
177 | z = 0; /* treat no-data and pen-up the same */ | |
178 | ||
179 | if (signal_pending(tsk)) { | |
180 | break; | |
181 | } | |
182 | ||
183 | if (z >= release_pressure) { | |
184 | y = ~y; /* top to bottom */ | |
185 | if (pen_was_down > 1 /*&& pen_was_down < PEN_DEBOUNCE*/) {//THXXX | |
186 | /* bounce ? */ | |
187 | x = pen_xy.x; | |
188 | y = pen_xy.y; | |
189 | --pen_was_down; | |
190 | } else if (pen_was_down <= 1) { | |
191 | pen_xy.x = x; | |
192 | pen_xy.y = y; | |
193 | if (pen_was_down) | |
194 | wm97xx_ts_send_data(ts, x, y, z); | |
195 | pen_was_down = PEN_DEBOUNCE; | |
196 | } | |
197 | //wm97xx_ts_send_data(ts, x, y, z); | |
198 | timeout = HZ / SAMPLE_RATE; | |
199 | } else { | |
200 | if (pen_was_down) { | |
201 | if (--pen_was_down) | |
202 | z = release_pressure; | |
203 | else //THXXX | |
204 | wm97xx_ts_send_data(ts, pen_xy.x, pen_xy.y, z); | |
205 | } | |
206 | /* The pendown signal takes some time to settle after | |
207 | * reading the pen pressure so wait a little | |
208 | * before enabling the pen. | |
209 | */ | |
210 | if (! pen_was_down) { | |
211 | // interruptible_sleep_on_timeout(&pendown_wait, HZ / PEN_UP_SETTLE); | |
212 | timeout = HZ * PEN_UP_TIMEOUT; | |
213 | } | |
214 | } | |
215 | enable_irq(PEN_DOWN_IRQ); | |
216 | } | |
217 | enable_irq(PEN_DOWN_IRQ); | |
218 | ts_task = NULL; | |
219 | complete(&ts_complete); | |
220 | return 0; | |
221 | } | |
222 | ||
223 | static int __init ts_mirage_init(void) | |
224 | { | |
225 | int ret; | |
226 | ||
227 | /* pen down signal is connected to GPIO 7 */ | |
228 | ||
229 | ret = request_irq(PEN_DOWN_IRQ, pendown_irq, 0, "ts-pendown", NULL); | |
230 | if (ret) { | |
231 | err("unable to get pendown irq%d: [%d]", PEN_DOWN_IRQ, ret); | |
232 | return ret; | |
233 | } | |
234 | ||
235 | lock_kernel(); | |
236 | ret = kernel_thread(ts_thread, NULL, CLONE_FS | CLONE_FILES); | |
237 | if (ret < 0) { | |
238 | unlock_kernel(); | |
239 | return ret; | |
240 | } | |
241 | unlock_kernel(); | |
242 | ||
243 | info("Mirage touchscreen IRQ initialized."); | |
244 | ||
245 | return 0; | |
246 | } | |
247 | ||
248 | static void __exit ts_mirage_exit(void) | |
249 | { | |
250 | if (ts_task) { | |
251 | send_sig(SIGKILL, ts_task, 1); | |
252 | wait_for_completion(&ts_complete); | |
253 | } | |
254 | ||
255 | free_irq(PEN_DOWN_IRQ, NULL); | |
256 | } | |
257 | ||
258 | module_init(ts_mirage_init); | |
259 | module_exit(ts_mirage_exit); | |
260 |