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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 | /* * 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/config.h> #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); |