2 * TSC2301 keypad driver
4 * Copyright (C) 2005-2006 Nokia Corporation
6 * Written by Jarkko Oikarinen
7 * Rewritten by Juha Yrjola <juha.yrjola@nokia.com>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 #include <linux/kernel.h>
26 #include <linux/module.h>
27 #include <linux/input.h>
28 #include <linux/interrupt.h>
29 #include <linux/irq.h>
30 #include <linux/delay.h>
31 #include <linux/spi/spi.h>
33 #ifdef CONFIG_ARCH_OMAP
34 #include <asm/arch/gpio.h>
37 #include <linux/spi/tsc2301.h>
39 #define TSC2301_KEYBOARD_PRODUCT_ID 0x0051
40 #define TSC2301_KEYBOARD_PRODUCT_VERSION 0x0001
41 #define TSC2301_DEBOUNCE_TIME_2MS 0x0000
42 #define TSC2301_DEBOUNCE_TIME_10MS 0x0800
43 #define TSC2301_DEBOUNCE_TIME_20MS 0x1000
44 #define TSC2301_DEBOUNCE_TIME_50MS 0x1800
45 #define TSC2301_DEBOUNCE_TIME_60MS 0x2000
46 #define TSC2301_DEBOUNCE_TIME_80MS 0x2800
47 #define TSC2301_DEBOUNCE_TIME_100MS 0x3000
48 #define TSC2301_DEBOUNCE_TIME_120MS 0x3800
50 #define TSC2301_DEBOUNCE_TIME TSC2301_DEBOUNCE_TIME_20MS
52 #define TSC2301_RELEASE_TIMEOUT 50
55 struct input_dev *idev;
59 struct timer_list timer;
62 unsigned user_disabled:1;
63 unsigned disable_depth;
65 struct spi_transfer read_xfer[4];
66 struct spi_message read_msg;
75 static inline int tsc2301_kp_disabled(struct tsc2301 *tsc)
77 return tsc->kp->disable_depth != 0;
80 static void tsc2301_kp_send_key_events(struct tsc2301 *tsc,
84 struct tsc2301_kp *kp = tsc->kp;
85 u16 common, released, pressed;
88 common = prev_state & new_state;
89 released = common ^ prev_state;
90 pressed = common ^ new_state;
91 if (!released && !pressed)
93 for (i = 0; i < 16 && (released || pressed); i++) {
95 dev_dbg(&tsc->spi->dev, "key %d released\n", i);
96 input_report_key(kp->idev, kp->keymap[i], 0);
100 dev_dbg(&tsc->spi->dev, "key %d pressed\n", i);
101 input_report_key(kp->idev, kp->keymap[i], 1);
105 input_sync(kp->idev);
108 static inline void _filter_out(struct tsc2301 *tsc, u16 prev_state,
109 u16 *new_state, int row1, int row2, u8 rect_pat)
113 mask = (rect_pat << (row1 * 4)) | (rect_pat << (row2 * 4));
116 dev_dbg(&tsc->spi->dev, "filtering ghost keys %02x\n", mask);
119 static void tsc2301_filter_ghost_keys(struct tsc2301 *tsc, u16 prev_state,
125 static const u8 rect_pat[] = {
126 0x3, 0x5, 0x9, 0x6, 0xa, 0xc, 0,
129 key_map = *new_state;
130 for (row1 = 0; row1 < 4; row1++) {
131 row1_map = (key_map >> (row1 * 4)) & 0xf;
134 for (row2 = row1 + 1; row2 < 4; row2++) {
135 u16 rect_map = (key_map >> (row2 * 4)) & 0xf;
138 rect_map &= row1_map;
141 for (rp = rect_pat; *rp; rp++)
142 if ((rect_map & *rp) == *rp)
143 _filter_out(tsc, prev_state, new_state,
149 static void tsc2301_kp_timer(unsigned long arg)
151 struct tsc2301 *tsc = (void *) arg;
152 struct tsc2301_kp *kp = tsc->kp;
155 tsc2301_kp_send_key_events(tsc, kp->keys_pressed, 0);
156 spin_lock_irqsave(&kp->lock, flags);
157 kp->keys_pressed = 0;
158 spin_unlock_irqrestore(&kp->lock, flags);
161 static void tsc2301_kp_rx(void *arg)
163 struct tsc2301 *tsc = arg;
164 struct tsc2301_kp *kp = tsc->kp;
169 dev_dbg(&tsc->spi->dev, "KP data %04x\n", kp_data);
171 tsc2301_filter_ghost_keys(tsc, kp->keys_pressed, &kp_data);
172 tsc2301_kp_send_key_events(tsc, kp->keys_pressed, kp_data);
173 spin_lock_irqsave(&kp->lock, flags);
174 kp->keys_pressed = kp_data;
176 spin_unlock_irqrestore(&kp->lock, flags);
179 static irqreturn_t tsc2301_kp_irq_handler(int irq, void *dev_id)
181 struct tsc2301 *tsc = dev_id;
182 struct tsc2301_kp *kp = tsc->kp;
186 spin_lock_irqsave(&kp->lock, flags);
187 if (tsc2301_kp_disabled(tsc)) {
188 spin_unlock_irqrestore(&kp->lock, flags);
192 spin_unlock_irqrestore(&kp->lock, flags);
193 mod_timer(&kp->timer,
194 jiffies + msecs_to_jiffies(TSC2301_RELEASE_TIMEOUT));
195 r = spi_async(tsc->spi, &tsc->kp->read_msg);
197 dev_err(&tsc->spi->dev, "kp: spi_async() failed");
201 static void tsc2301_kp_start_scan(struct tsc2301 *tsc)
203 tsc2301_write_reg(tsc, TSC2301_REG_KPMASK, tsc->kp->mask);
204 tsc2301_write_reg(tsc, TSC2301_REG_KEY, TSC2301_DEBOUNCE_TIME);
207 static void tsc2301_kp_stop_scan(struct tsc2301 *tsc)
209 tsc2301_write_reg(tsc, TSC2301_REG_KEY, 1 << 14);
212 /* Must be called with the mutex held */
213 static void tsc2301_kp_enable(struct tsc2301 *tsc)
215 struct tsc2301_kp *kp = tsc->kp;
218 spin_lock_irqsave(&kp->lock, flags);
219 BUG_ON(!tsc2301_kp_disabled(tsc));
220 if (--kp->disable_depth != 0) {
221 spin_unlock_irqrestore(&kp->lock, flags);
224 spin_unlock_irqrestore(&kp->lock, flags);
226 set_irq_type(kp->irq, IRQT_FALLING);
227 tsc2301_kp_start_scan(tsc);
231 /* Must be called with the mutex held */
232 static int tsc2301_kp_disable(struct tsc2301 *tsc, int release_keys)
234 struct tsc2301_kp *kp = tsc->kp;
237 spin_lock_irqsave(&kp->lock, flags);
238 if (kp->disable_depth++ != 0) {
239 spin_unlock_irqrestore(&kp->lock, flags);
242 disable_irq_nosync(kp->irq);
243 set_irq_type(kp->irq, IRQT_NOEDGE);
244 spin_unlock_irqrestore(&kp->lock, flags);
246 while (kp->pending) {
250 tsc2301_kp_stop_scan(tsc);
253 del_timer(&kp->timer); /* let timeout release keys */
258 /* The following workaround is needed for a HW bug triggered by the
260 * 1. keep any key pressed
262 * 3. release all keys
264 * 5. disable touch screen controller
266 * After this the keypad scanner will get stuck in busy state and won't
267 * report any interrupts for further keypresses. One way to recover is to
268 * restart the keypad scanner whenever we enable / disable the
269 * touchscreen controller.
271 void tsc2301_kp_restart(struct tsc2301 *tsc)
273 struct tsc2301_kp *kp = tsc->kp;
275 mutex_lock(&kp->mutex);
276 if (!kp->user_disabled) {
277 tsc2301_kp_disable(tsc, 0);
278 tsc2301_kp_enable(tsc);
280 mutex_unlock(&kp->mutex);
283 static ssize_t tsc2301_kp_disable_show(struct device *dev,
284 struct device_attribute *attr, char *buf)
286 struct tsc2301 *tsc = dev_get_drvdata(dev);
288 return sprintf(buf, "%u\n", tsc2301_kp_disabled(tsc) ? 1 : 0);
291 static ssize_t tsc2301_kp_disable_store(struct device *dev,
292 struct device_attribute *attr,
293 const char *buf, size_t count)
295 struct tsc2301 *tsc = dev_get_drvdata(dev);
296 struct tsc2301_kp *kp = tsc->kp;
300 i = simple_strtoul(buf, &endp, 10);
303 mutex_lock(&kp->mutex);
304 if (i == kp->user_disabled) {
305 mutex_unlock(&kp->mutex);
308 kp->user_disabled = i;
311 tsc2301_kp_disable(tsc, 1);
313 tsc2301_kp_enable(tsc);
314 mutex_unlock(&kp->mutex);
319 static DEVICE_ATTR(disable_kp, 0664, tsc2301_kp_disable_show,
320 tsc2301_kp_disable_store);
322 static const u16 tsc2301_kp_read_data = 0x8000 | TSC2301_REG_KPDATA;
324 static void tsc2301_kp_setup_spi_xfer(struct tsc2301 *tsc)
326 struct tsc2301_kp *kp = tsc->kp;
327 struct spi_message *m = &kp->read_msg;
328 struct spi_transfer *x = &kp->read_xfer[0];
330 spi_message_init(&kp->read_msg);
332 x->tx_buf = &tsc2301_kp_read_data;
334 spi_message_add_tail(x, m);
337 x->rx_buf = &kp->data;
339 spi_message_add_tail(x, m);
341 m->complete = tsc2301_kp_rx;
346 int tsc2301_kp_suspend(struct tsc2301 *tsc)
348 struct tsc2301_kp *kp = tsc->kp;
350 mutex_lock(&kp->mutex);
351 tsc2301_kp_disable(tsc, 1);
352 mutex_unlock(&kp->mutex);
356 void tsc2301_kp_resume(struct tsc2301 *tsc)
358 struct tsc2301_kp *kp = tsc->kp;
360 mutex_lock(&kp->mutex);
361 tsc2301_kp_enable(tsc);
362 mutex_unlock(&kp->mutex);
366 int __devinit tsc2301_kp_init(struct tsc2301 *tsc,
367 struct tsc2301_platform_data *pdata)
369 struct input_dev *idev;
370 struct tsc2301_kp *kp;
374 if (pdata->keyb_int < 0) {
375 dev_err(&tsc->spi->dev, "need kbirq");
379 kp = kzalloc(sizeof(*kp), GFP_KERNEL);
384 kp->irq = pdata->keyb_int;
385 spin_lock_init(&kp->lock);
386 mutex_init(&kp->mutex);
388 init_timer(&kp->timer);
389 kp->timer.data = (unsigned long) tsc;
390 kp->timer.function = tsc2301_kp_timer;
392 idev = input_allocate_device();
397 idev->name = "TSC2301 keypad";
398 snprintf(kp->phys, sizeof(kp->phys), "%s/input-kp", tsc->spi->dev.bus_id);
399 idev->phys = kp->phys;
402 idev->evbit[0] = BIT(EV_KEY);
403 for (i = 0; i < 16; i++) {
404 if (pdata->keymap[i] > 0) {
405 set_bit(pdata->keymap[i], idev->keybit);
406 kp->keymap[i] = pdata->keymap[i];
414 set_bit(EV_REP, idev->evbit);
418 tsc2301_kp_setup_spi_xfer(tsc);
420 r = device_create_file(&tsc->spi->dev, &dev_attr_disable_kp);
424 tsc2301_kp_start_scan(tsc);
426 /* IRQ mode 0 is faulty, it can cause the KBIRQ to get stuck.
427 * Mode 2 deasserts the IRQ at:
429 * - Setting SCS flag in REG_KEY register
430 * - Releasing all keys
431 * - Reading the REG_KPDATA
433 tsc2301_write_kbc(tsc, 2);
435 tsc2301_write_reg(tsc, TSC2301_REG_KPMASK, mask);
438 set_irq_type(kp->irq, IRQT_FALLING);
440 r = request_irq(kp->irq, tsc2301_kp_irq_handler, IRQF_SAMPLE_RANDOM,
443 dev_err(&tsc->spi->dev, "unable to get kbirq IRQ");
446 set_irq_wake(kp->irq, 1);
448 /* We need to read the register once..? */
449 tsc2301_read_reg(tsc, TSC2301_REG_KPDATA);
451 r = input_register_device(idev);
453 dev_err(&tsc->spi->dev, "can't register keypad device\n");
460 free_irq(kp->irq, tsc);
462 tsc2301_kp_stop_scan(tsc);
463 device_remove_file(&tsc->spi->dev, &dev_attr_disable_kp);
465 input_free_device(kp->idev);
471 void __devexit tsc2301_kp_exit(struct tsc2301 *tsc)
473 struct tsc2301_kp *kp = tsc->kp;
475 tsc2301_kp_disable(tsc, 1);
476 input_unregister_device(kp->idev);
477 free_irq(kp->irq, tsc);
478 device_remove_file(&tsc->spi->dev, &dev_attr_disable_kp);