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Komal Shahad4e09b2006-09-29 01:59:19 -07001/*
2 * linux/drivers/input/keyboard/omap-keypad.c
3 *
4 * OMAP Keypad Driver
5 *
6 * Copyright (C) 2003 Nokia Corporation
Jan Engelhardt96de0e22007-10-19 23:21:04 +02007 * Written by Timo Teräs <ext-timo.teras@nokia.com>
Komal Shahad4e09b2006-09-29 01:59:19 -07008 *
9 * Added support for H2 & H3 Keypad
10 * Copyright (C) 2004 Texas Instruments
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 */
26
27#include <linux/module.h>
28#include <linux/init.h>
29#include <linux/interrupt.h>
30#include <linux/types.h>
31#include <linux/input.h>
32#include <linux/kernel.h>
33#include <linux/delay.h>
34#include <linux/platform_device.h>
35#include <linux/mutex.h>
36#include <linux/errno.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090037#include <linux/slab.h>
Russell Kinga09e64f2008-08-05 16:14:15 +010038#include <mach/gpio.h>
Tony Lindgrence491cf2009-10-20 09:40:47 -070039#include <plat/keypad.h>
40#include <plat/menelaus.h>
Komal Shahad4e09b2006-09-29 01:59:19 -070041#include <asm/irq.h>
Russell Kinga09e64f2008-08-05 16:14:15 +010042#include <mach/hardware.h>
Komal Shahad4e09b2006-09-29 01:59:19 -070043#include <asm/io.h>
Tony Lindgrence491cf2009-10-20 09:40:47 -070044#include <plat/mux.h>
Komal Shahad4e09b2006-09-29 01:59:19 -070045
46#undef NEW_BOARD_LEARNING_MODE
47
48static void omap_kp_tasklet(unsigned long);
49static void omap_kp_timer(unsigned long);
50
51static unsigned char keypad_state[8];
52static DEFINE_MUTEX(kp_enable_mutex);
53static int kp_enable = 1;
54static int kp_cur_group = -1;
55
56struct omap_kp {
57 struct input_dev *input;
58 struct timer_list timer;
59 int irq;
60 unsigned int rows;
61 unsigned int cols;
62 unsigned long delay;
63 unsigned int debounce;
64};
65
Russell King7c8ad982008-09-05 15:13:24 +010066static DECLARE_TASKLET_DISABLED(kp_tasklet, omap_kp_tasklet, 0);
Komal Shahad4e09b2006-09-29 01:59:19 -070067
Komal Shahad4e09b2006-09-29 01:59:19 -070068static unsigned int *row_gpios;
69static unsigned int *col_gpios;
70
71#ifdef CONFIG_ARCH_OMAP2
72static void set_col_gpio_val(struct omap_kp *omap_kp, u8 value)
73{
74 int col;
David Brownell93a22f82008-10-15 22:03:15 -070075
76 for (col = 0; col < omap_kp->cols; col++)
77 gpio_set_value(col_gpios[col], value & (1 << col));
Komal Shahad4e09b2006-09-29 01:59:19 -070078}
79
80static u8 get_row_gpio_val(struct omap_kp *omap_kp)
81{
82 int row;
83 u8 value = 0;
84
85 for (row = 0; row < omap_kp->rows; row++) {
David Brownell93a22f82008-10-15 22:03:15 -070086 if (gpio_get_value(row_gpios[row]))
Komal Shahad4e09b2006-09-29 01:59:19 -070087 value |= (1 << row);
88 }
89 return value;
90}
91#else
92#define set_col_gpio_val(x, y) do {} while (0)
93#define get_row_gpio_val(x) 0
94#endif
95
David Howells7d12e782006-10-05 14:55:46 +010096static irqreturn_t omap_kp_interrupt(int irq, void *dev_id)
Komal Shahad4e09b2006-09-29 01:59:19 -070097{
98 struct omap_kp *omap_kp = dev_id;
99
100 /* disable keyboard interrupt and schedule for handling */
101 if (cpu_is_omap24xx()) {
102 int i;
Ben Nizette0f751712009-04-17 20:35:57 -0700103
104 for (i = 0; i < omap_kp->rows; i++) {
105 int gpio_irq = gpio_to_irq(row_gpios[i]);
106 /*
107 * The interrupt which we're currently handling should
108 * be disabled _nosync() to avoid deadlocks waiting
109 * for this handler to complete. All others should
110 * be disabled the regular way for SMP safety.
111 */
112 if (gpio_irq == irq)
113 disable_irq_nosync(gpio_irq);
114 else
115 disable_irq(gpio_irq);
116 }
Komal Shahad4e09b2006-09-29 01:59:19 -0700117 } else
118 /* disable keyboard interrupt and schedule for handling */
Tony Lindgren61755562009-08-28 10:50:34 -0700119 omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
Komal Shahad4e09b2006-09-29 01:59:19 -0700120
121 tasklet_schedule(&kp_tasklet);
122
123 return IRQ_HANDLED;
124}
125
126static void omap_kp_timer(unsigned long data)
127{
128 tasklet_schedule(&kp_tasklet);
129}
130
131static void omap_kp_scan_keypad(struct omap_kp *omap_kp, unsigned char *state)
132{
133 int col = 0;
134
135 /* read the keypad status */
136 if (cpu_is_omap24xx()) {
Komal Shahad4e09b2006-09-29 01:59:19 -0700137 /* read the keypad status */
138 for (col = 0; col < omap_kp->cols; col++) {
139 set_col_gpio_val(omap_kp, ~(1 << col));
Peter Ujfalusidde4ac02008-10-28 23:53:25 -0400140 state[col] = ~(get_row_gpio_val(omap_kp)) & 0xff;
Komal Shahad4e09b2006-09-29 01:59:19 -0700141 }
142 set_col_gpio_val(omap_kp, 0);
143
144 } else {
145 /* disable keyboard interrupt and schedule for handling */
Tony Lindgren61755562009-08-28 10:50:34 -0700146 omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
Komal Shahad4e09b2006-09-29 01:59:19 -0700147
148 /* read the keypad status */
Tony Lindgren61755562009-08-28 10:50:34 -0700149 omap_writew(0xff, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC);
Komal Shahad4e09b2006-09-29 01:59:19 -0700150 for (col = 0; col < omap_kp->cols; col++) {
151 omap_writew(~(1 << col) & 0xff,
Tony Lindgren61755562009-08-28 10:50:34 -0700152 OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC);
Komal Shahad4e09b2006-09-29 01:59:19 -0700153
154 udelay(omap_kp->delay);
155
Tony Lindgren61755562009-08-28 10:50:34 -0700156 state[col] = ~omap_readw(OMAP1_MPUIO_BASE +
Komal Shahad4e09b2006-09-29 01:59:19 -0700157 OMAP_MPUIO_KBR_LATCH) & 0xff;
158 }
Tony Lindgren61755562009-08-28 10:50:34 -0700159 omap_writew(0x00, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC);
Komal Shahad4e09b2006-09-29 01:59:19 -0700160 udelay(2);
161 }
162}
163
Komal Shahad4e09b2006-09-29 01:59:19 -0700164static void omap_kp_tasklet(unsigned long data)
165{
166 struct omap_kp *omap_kp_data = (struct omap_kp *) data;
Janusz Krzysztofikda1f0262010-12-20 21:09:22 +0000167 unsigned short *keycodes = omap_kp_data->input->keycode;
168 unsigned int row_shift = get_count_order(omap_kp_data->cols);
Komal Shahad4e09b2006-09-29 01:59:19 -0700169 unsigned char new_state[8], changed, key_down = 0;
170 int col, row;
171 int spurious = 0;
172
173 /* check for any changes */
174 omap_kp_scan_keypad(omap_kp_data, new_state);
175
176 /* check for changes and print those */
177 for (col = 0; col < omap_kp_data->cols; col++) {
178 changed = new_state[col] ^ keypad_state[col];
179 key_down |= new_state[col];
180 if (changed == 0)
181 continue;
182
183 for (row = 0; row < omap_kp_data->rows; row++) {
184 int key;
185 if (!(changed & (1 << row)))
186 continue;
187#ifdef NEW_BOARD_LEARNING_MODE
188 printk(KERN_INFO "omap-keypad: key %d-%d %s\n", col,
189 row, (new_state[col] & (1 << row)) ?
190 "pressed" : "released");
191#else
Janusz Krzysztofikda1f0262010-12-20 21:09:22 +0000192 key = keycodes[MATRIX_SCAN_CODE(row, col, row_shift)];
Komal Shahad4e09b2006-09-29 01:59:19 -0700193 if (key < 0) {
194 printk(KERN_WARNING
195 "omap-keypad: Spurious key event %d-%d\n",
196 col, row);
197 /* We scan again after a couple of seconds */
198 spurious = 1;
199 continue;
200 }
201
202 if (!(kp_cur_group == (key & GROUP_MASK) ||
203 kp_cur_group == -1))
204 continue;
205
206 kp_cur_group = key & GROUP_MASK;
207 input_report_key(omap_kp_data->input, key & ~GROUP_MASK,
208 new_state[col] & (1 << row));
209#endif
210 }
211 }
212 memcpy(keypad_state, new_state, sizeof(keypad_state));
213
214 if (key_down) {
215 int delay = HZ / 20;
216 /* some key is pressed - keep irq disabled and use timer
217 * to poll the keypad */
218 if (spurious)
219 delay = 2 * HZ;
220 mod_timer(&omap_kp_data->timer, jiffies + delay);
221 } else {
222 /* enable interrupts */
223 if (cpu_is_omap24xx()) {
224 int i;
225 for (i = 0; i < omap_kp_data->rows; i++)
David Brownell15f74b02008-12-10 17:35:26 -0800226 enable_irq(gpio_to_irq(row_gpios[i]));
Komal Shahad4e09b2006-09-29 01:59:19 -0700227 } else {
Tony Lindgren61755562009-08-28 10:50:34 -0700228 omap_writew(0, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
Komal Shahad4e09b2006-09-29 01:59:19 -0700229 kp_cur_group = -1;
230 }
Dmitry Torokhov93603532007-10-12 14:20:00 -0400231 }
Komal Shahad4e09b2006-09-29 01:59:19 -0700232}
233
234static ssize_t omap_kp_enable_show(struct device *dev,
235 struct device_attribute *attr, char *buf)
236{
237 return sprintf(buf, "%u\n", kp_enable);
238}
239
240static ssize_t omap_kp_enable_store(struct device *dev, struct device_attribute *attr,
241 const char *buf, size_t count)
242{
243 int state;
244
245 if (sscanf(buf, "%u", &state) != 1)
246 return -EINVAL;
247
248 if ((state != 1) && (state != 0))
249 return -EINVAL;
250
251 mutex_lock(&kp_enable_mutex);
252 if (state != kp_enable) {
253 if (state)
254 enable_irq(INT_KEYBOARD);
255 else
256 disable_irq(INT_KEYBOARD);
257 kp_enable = state;
258 }
259 mutex_unlock(&kp_enable_mutex);
260
261 return strnlen(buf, count);
262}
263
264static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, omap_kp_enable_show, omap_kp_enable_store);
265
266#ifdef CONFIG_PM
267static int omap_kp_suspend(struct platform_device *dev, pm_message_t state)
268{
269 /* Nothing yet */
270
271 return 0;
272}
273
274static int omap_kp_resume(struct platform_device *dev)
275{
276 /* Nothing yet */
277
278 return 0;
279}
280#else
281#define omap_kp_suspend NULL
282#define omap_kp_resume NULL
283#endif
284
Uwe Kleine-Königd63dab02009-01-13 18:20:20 -0800285static int __devinit omap_kp_probe(struct platform_device *pdev)
Komal Shahad4e09b2006-09-29 01:59:19 -0700286{
287 struct omap_kp *omap_kp;
288 struct input_dev *input_dev;
289 struct omap_kp_platform_data *pdata = pdev->dev.platform_data;
290 int i, col_idx, row_idx, irq_idx, ret;
Janusz Krzysztofikda1f0262010-12-20 21:09:22 +0000291 unsigned int row_shift, keycodemax;
Komal Shahad4e09b2006-09-29 01:59:19 -0700292
Janusz Krzysztofikda1f0262010-12-20 21:09:22 +0000293 if (!pdata->rows || !pdata->cols || !pdata->keymap_data) {
294 printk(KERN_ERR "No rows, cols or keymap_data from pdata\n");
Komal Shahad4e09b2006-09-29 01:59:19 -0700295 return -EINVAL;
296 }
297
Janusz Krzysztofikda1f0262010-12-20 21:09:22 +0000298 row_shift = get_count_order(pdata->cols);
299 keycodemax = pdata->rows << row_shift;
300
301 omap_kp = kzalloc(sizeof(struct omap_kp) +
302 keycodemax * sizeof(unsigned short), GFP_KERNEL);
Komal Shahad4e09b2006-09-29 01:59:19 -0700303 input_dev = input_allocate_device();
304 if (!omap_kp || !input_dev) {
305 kfree(omap_kp);
306 input_free_device(input_dev);
307 return -ENOMEM;
308 }
309
310 platform_set_drvdata(pdev, omap_kp);
311
312 omap_kp->input = input_dev;
313
314 /* Disable the interrupt for the MPUIO keyboard */
315 if (!cpu_is_omap24xx())
Tony Lindgren61755562009-08-28 10:50:34 -0700316 omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
Komal Shahad4e09b2006-09-29 01:59:19 -0700317
Janusz Krzysztofikda1f0262010-12-20 21:09:22 +0000318 input_dev->keycode = &omap_kp[1];
319 input_dev->keycodesize = sizeof(unsigned short);
320 input_dev->keycodemax = keycodemax;
Komal Shahad4e09b2006-09-29 01:59:19 -0700321
322 if (pdata->rep)
Dmitry Torokhov93603532007-10-12 14:20:00 -0400323 __set_bit(EV_REP, input_dev->evbit);
Komal Shahad4e09b2006-09-29 01:59:19 -0700324
325 if (pdata->delay)
326 omap_kp->delay = pdata->delay;
327
328 if (pdata->row_gpios && pdata->col_gpios) {
329 row_gpios = pdata->row_gpios;
330 col_gpios = pdata->col_gpios;
331 }
332
333 omap_kp->rows = pdata->rows;
334 omap_kp->cols = pdata->cols;
335
336 if (cpu_is_omap24xx()) {
337 /* Cols: outputs */
338 for (col_idx = 0; col_idx < omap_kp->cols; col_idx++) {
David Brownell93a22f82008-10-15 22:03:15 -0700339 if (gpio_request(col_gpios[col_idx], "omap_kp_col") < 0) {
Komal Shahad4e09b2006-09-29 01:59:19 -0700340 printk(KERN_ERR "Failed to request"
341 "GPIO%d for keypad\n",
342 col_gpios[col_idx]);
343 goto err1;
344 }
David Brownell93a22f82008-10-15 22:03:15 -0700345 gpio_direction_output(col_gpios[col_idx], 0);
Komal Shahad4e09b2006-09-29 01:59:19 -0700346 }
347 /* Rows: inputs */
348 for (row_idx = 0; row_idx < omap_kp->rows; row_idx++) {
David Brownell93a22f82008-10-15 22:03:15 -0700349 if (gpio_request(row_gpios[row_idx], "omap_kp_row") < 0) {
Komal Shahad4e09b2006-09-29 01:59:19 -0700350 printk(KERN_ERR "Failed to request"
351 "GPIO%d for keypad\n",
352 row_gpios[row_idx]);
353 goto err2;
354 }
David Brownell93a22f82008-10-15 22:03:15 -0700355 gpio_direction_input(row_gpios[row_idx]);
Komal Shahad4e09b2006-09-29 01:59:19 -0700356 }
David Brownellda3e4c82008-04-15 01:31:33 -0400357 } else {
358 col_idx = 0;
359 row_idx = 0;
Komal Shahad4e09b2006-09-29 01:59:19 -0700360 }
361
362 setup_timer(&omap_kp->timer, omap_kp_timer, (unsigned long)omap_kp);
363
364 /* get the irq and init timer*/
365 tasklet_enable(&kp_tasklet);
366 kp_tasklet.data = (unsigned long) omap_kp;
367
368 ret = device_create_file(&pdev->dev, &dev_attr_enable);
369 if (ret < 0)
370 goto err2;
371
372 /* setup input device */
Dmitry Torokhov93603532007-10-12 14:20:00 -0400373 __set_bit(EV_KEY, input_dev->evbit);
Janusz Krzysztofikda1f0262010-12-20 21:09:22 +0000374 matrix_keypad_build_keymap(pdata->keymap_data, row_shift,
375 input_dev->keycode, input_dev->keybit);
Komal Shahad4e09b2006-09-29 01:59:19 -0700376 input_dev->name = "omap-keypad";
377 input_dev->phys = "omap-keypad/input0";
Dmitry Torokhov469ba4d2007-04-12 01:34:58 -0400378 input_dev->dev.parent = &pdev->dev;
Komal Shahad4e09b2006-09-29 01:59:19 -0700379
380 input_dev->id.bustype = BUS_HOST;
381 input_dev->id.vendor = 0x0001;
382 input_dev->id.product = 0x0001;
383 input_dev->id.version = 0x0100;
384
Komal Shahad4e09b2006-09-29 01:59:19 -0700385 ret = input_register_device(omap_kp->input);
386 if (ret < 0) {
387 printk(KERN_ERR "Unable to register omap-keypad input device\n");
388 goto err3;
389 }
390
391 if (pdata->dbounce)
Tony Lindgren61755562009-08-28 10:50:34 -0700392 omap_writew(0xff, OMAP1_MPUIO_BASE + OMAP_MPUIO_GPIO_DEBOUNCING);
Komal Shahad4e09b2006-09-29 01:59:19 -0700393
394 /* scan current status and enable interrupt */
395 omap_kp_scan_keypad(omap_kp, keypad_state);
396 if (!cpu_is_omap24xx()) {
397 omap_kp->irq = platform_get_irq(pdev, 0);
398 if (omap_kp->irq >= 0) {
399 if (request_irq(omap_kp->irq, omap_kp_interrupt, 0,
400 "omap-keypad", omap_kp) < 0)
401 goto err4;
402 }
Tony Lindgren61755562009-08-28 10:50:34 -0700403 omap_writew(0, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
Komal Shahad4e09b2006-09-29 01:59:19 -0700404 } else {
405 for (irq_idx = 0; irq_idx < omap_kp->rows; irq_idx++) {
David Brownell15f74b02008-12-10 17:35:26 -0800406 if (request_irq(gpio_to_irq(row_gpios[irq_idx]),
Dmitry Torokhov93603532007-10-12 14:20:00 -0400407 omap_kp_interrupt,
Komal Shahad4e09b2006-09-29 01:59:19 -0700408 IRQF_TRIGGER_FALLING,
Dmitry Torokhov93603532007-10-12 14:20:00 -0400409 "omap-keypad", omap_kp) < 0)
Komal Shahad4e09b2006-09-29 01:59:19 -0700410 goto err5;
411 }
412 }
413 return 0;
414err5:
Dmitry Torokhov93603532007-10-12 14:20:00 -0400415 for (i = irq_idx - 1; i >=0; i--)
Axel Lin60c8ba62011-04-27 21:39:57 -0700416 free_irq(row_gpios[i], omap_kp);
Komal Shahad4e09b2006-09-29 01:59:19 -0700417err4:
418 input_unregister_device(omap_kp->input);
419 input_dev = NULL;
420err3:
421 device_remove_file(&pdev->dev, &dev_attr_enable);
422err2:
David Brownellda3e4c82008-04-15 01:31:33 -0400423 for (i = row_idx - 1; i >=0; i--)
David Brownell93a22f82008-10-15 22:03:15 -0700424 gpio_free(row_gpios[i]);
Komal Shahad4e09b2006-09-29 01:59:19 -0700425err1:
David Brownellda3e4c82008-04-15 01:31:33 -0400426 for (i = col_idx - 1; i >=0; i--)
David Brownell93a22f82008-10-15 22:03:15 -0700427 gpio_free(col_gpios[i]);
Komal Shahad4e09b2006-09-29 01:59:19 -0700428
429 kfree(omap_kp);
430 input_free_device(input_dev);
431
432 return -EINVAL;
433}
434
Uwe Kleine-Königd63dab02009-01-13 18:20:20 -0800435static int __devexit omap_kp_remove(struct platform_device *pdev)
Komal Shahad4e09b2006-09-29 01:59:19 -0700436{
437 struct omap_kp *omap_kp = platform_get_drvdata(pdev);
438
439 /* disable keypad interrupt handling */
440 tasklet_disable(&kp_tasklet);
441 if (cpu_is_omap24xx()) {
442 int i;
443 for (i = 0; i < omap_kp->cols; i++)
David Brownell93a22f82008-10-15 22:03:15 -0700444 gpio_free(col_gpios[i]);
Komal Shahad4e09b2006-09-29 01:59:19 -0700445 for (i = 0; i < omap_kp->rows; i++) {
David Brownell93a22f82008-10-15 22:03:15 -0700446 gpio_free(row_gpios[i]);
Axel Lin60c8ba62011-04-27 21:39:57 -0700447 free_irq(gpio_to_irq(row_gpios[i]), omap_kp);
Komal Shahad4e09b2006-09-29 01:59:19 -0700448 }
449 } else {
Tony Lindgren61755562009-08-28 10:50:34 -0700450 omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
Axel Lin60c8ba62011-04-27 21:39:57 -0700451 free_irq(omap_kp->irq, omap_kp);
Komal Shahad4e09b2006-09-29 01:59:19 -0700452 }
453
454 del_timer_sync(&omap_kp->timer);
455 tasklet_kill(&kp_tasklet);
456
457 /* unregister everything */
458 input_unregister_device(omap_kp->input);
459
460 kfree(omap_kp);
461
462 return 0;
463}
464
465static struct platform_driver omap_kp_driver = {
466 .probe = omap_kp_probe,
Uwe Kleine-Königd63dab02009-01-13 18:20:20 -0800467 .remove = __devexit_p(omap_kp_remove),
Komal Shahad4e09b2006-09-29 01:59:19 -0700468 .suspend = omap_kp_suspend,
469 .resume = omap_kp_resume,
470 .driver = {
471 .name = "omap-keypad",
Kay Sieversd7b52472008-04-18 00:24:42 -0400472 .owner = THIS_MODULE,
Komal Shahad4e09b2006-09-29 01:59:19 -0700473 },
474};
475
Uwe Kleine-Königd63dab02009-01-13 18:20:20 -0800476static int __init omap_kp_init(void)
Komal Shahad4e09b2006-09-29 01:59:19 -0700477{
478 printk(KERN_INFO "OMAP Keypad Driver\n");
479 return platform_driver_register(&omap_kp_driver);
480}
481
482static void __exit omap_kp_exit(void)
483{
484 platform_driver_unregister(&omap_kp_driver);
485}
486
487module_init(omap_kp_init);
488module_exit(omap_kp_exit);
489
Jan Engelhardt96de0e22007-10-19 23:21:04 +0200490MODULE_AUTHOR("Timo Teräs");
Komal Shahad4e09b2006-09-29 01:59:19 -0700491MODULE_DESCRIPTION("OMAP Keypad Driver");
492MODULE_LICENSE("GPL");
Kay Sieversd7b52472008-04-18 00:24:42 -0400493MODULE_ALIAS("platform:omap-keypad");