2 * input/touchscreen/omap/omap_ts.c
4 * touchscreen input device driver for various TI OMAP boards
5 * Copyright (c) 2002 MontaVista Software Inc.
6 * Copyright (c) 2004 Texas Instruments, Inc.
7 * Cleanup and modularization 2004 by Dirk Behme <dirk.behme@de.bosch.com>
9 * Assembled using driver code copyright the companies above.
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 * 12/12/2004 Srinath Modified and intergrated code for H2 and H3
29 #include <linux/errno.h>
30 #include <linux/kernel.h>
31 #include <linux/module.h>
32 #include <linux/slab.h>
33 #include <linux/input.h>
34 #include <linux/init.h>
35 #include <linux/wait.h>
36 #include <linux/interrupt.h>
37 #include <linux/suspend.h>
38 #include <linux/platform_device.h>
40 #include <asm/mach-types.h>
46 #define OMAP_TS_NAME "omap_ts"
48 static struct ts_device *__initdata ts_devs[] = {
49 #if defined(CONFIG_MACH_OMAP_H2) || defined(CONFIG_MACH_OMAP_H3)
54 static struct omap_ts_t ts_omap;
56 static int omap_ts_read(void)
58 u16 data[4] = { 0, 0, 0, 0 };
60 ts_omap.dev->read(data);
62 input_report_abs(ts_omap.inputdevice, ABS_X, data[0]);
63 input_report_abs(ts_omap.inputdevice, ABS_Y, data[1]);
64 input_report_abs(ts_omap.inputdevice, ABS_PRESSURE, data[2]);
65 input_sync(ts_omap.inputdevice);
67 DEBUG_TS("omap_ts_read: read x=%d,y=%d,p=%d\n", data[0], data[1],
73 static void omap_ts_timer(unsigned long data)
77 spin_lock_irqsave(&ts_omap.lock, flags);
79 if (!ts_omap.dev->penup()) {
80 if (!ts_omap.touched) {
81 DEBUG_TS("omap_ts_timer: pen down\n");
82 input_report_key(ts_omap.inputdevice, BTN_TOUCH, 1);
86 ts_omap.ts_timer.expires = jiffies + HZ / 100;
87 add_timer(&(ts_omap.ts_timer));
89 if (ts_omap.touched) {
90 DEBUG_TS("omap_ts_timer: pen up\n");
92 input_report_abs(ts_omap.inputdevice, ABS_X, 0);
93 input_report_abs(ts_omap.inputdevice, ABS_Y, 0);
94 input_report_abs(ts_omap.inputdevice, ABS_PRESSURE,
96 input_sync(ts_omap.inputdevice);
97 input_report_key(ts_omap.inputdevice, BTN_TOUCH, 0);
99 if (!ts_omap.irq_enabled) {
100 ts_omap.irq_enabled = 1;
101 enable_irq(ts_omap.irq);
105 spin_unlock_irqrestore(&ts_omap.lock, flags);
108 static irqreturn_t omap_ts_handler(int irq, void *dev_id)
110 spin_lock(&ts_omap.lock);
112 if (ts_omap.irq_enabled) {
113 ts_omap.irq_enabled = 0;
117 mod_timer(&ts_omap.ts_timer, jiffies + HZ / 100);
119 spin_unlock(&ts_omap.lock);
124 static int __init omap_ts_probe(struct platform_device *pdev)
127 int status = -ENODEV;
129 memset(&ts_omap, 0, sizeof(ts_omap));
131 ts_omap.inputdevice = input_allocate_device();
132 if (!ts_omap.inputdevice) {
136 spin_lock_init(&ts_omap.lock);
138 for (i = 0; i < ARRAY_SIZE(ts_devs); i++) {
139 if (!ts_devs[i] || !ts_devs[i]->probe)
141 status = ts_devs[i]->probe(&ts_omap);
143 ts_omap.dev = ts_devs[i];
149 input_free_device(ts_omap.inputdevice);
153 // Init acquisition timer function
154 init_timer(&ts_omap.ts_timer);
155 ts_omap.ts_timer.function = omap_ts_timer;
158 if (ts_omap.irq != -1) {
159 if (request_irq(ts_omap.irq, omap_ts_handler,
160 IRQF_SAMPLE_RANDOM | ts_omap.irq_type,
161 OMAP_TS_NAME, &ts_omap)) {
163 "omap_ts.c: Could not allocate touchscreen IRQ!\n");
165 ts_omap.dev->remove();
166 input_free_device(ts_omap.inputdevice);
169 ts_omap.irq_enabled = 1;
171 printk(KERN_ERR "omap_ts.c: No touchscreen IRQ assigned!\n");
172 ts_omap.dev->remove();
173 input_free_device(ts_omap.inputdevice);
177 ts_omap.inputdevice->name = OMAP_TS_NAME;
178 ts_omap.inputdevice->dev = &pdev->dev;
179 ts_omap.inputdevice->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
180 ts_omap.inputdevice->keybit[BIT_WORD(BTN_TOUCH)] |= BIT(BTN_TOUCH);
181 ts_omap.inputdevice->absbit[0] =
182 BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_PRESSURE);
183 input_register_device(ts_omap.inputdevice);
185 ts_omap.dev->enable();
187 printk("OMAP touchscreen driver initialized\n");
192 static int omap_ts_remove(struct platform_device *pdev)
194 ts_omap.dev->disable();
195 input_unregister_device(ts_omap.inputdevice);
196 if (ts_omap.irq != -1)
197 free_irq(ts_omap.irq, &ts_omap);
199 ts_omap.dev->remove();
204 static int omap_ts_suspend(struct platform_device *pdev, pm_message_t state)
206 ts_omap.dev->disable();
210 static int omap_ts_resume(struct platform_device *pdev)
212 ts_omap.dev->enable();
216 static void omap_ts_device_release(struct device *dev)
220 static struct platform_driver omap_ts_driver = {
221 .probe = omap_ts_probe,
222 .remove = omap_ts_remove,
223 .suspend = omap_ts_suspend,
224 .resume = omap_ts_resume,
226 .name = OMAP_TS_NAME,
230 static struct platform_device omap_ts_device = {
231 .name = OMAP_TS_NAME,
234 .release = omap_ts_device_release,
238 static int __init omap_ts_init(void)
242 if (machine_is_omap_osk() || machine_is_omap_innovator())
245 ret = platform_device_register(&omap_ts_device);
249 ret = platform_driver_register(&omap_ts_driver);
251 platform_device_unregister(&omap_ts_device);
258 static void __exit omap_ts_exit(void)
260 platform_driver_unregister(&omap_ts_driver);
261 platform_device_unregister(&omap_ts_device);
264 module_init(omap_ts_init);
265 module_exit(omap_ts_exit);
267 MODULE_LICENSE("GPL");