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1/*
2 * linux/drivers/input/keyboard/omap-keypad.c
3 *
4 * OMAP Keypad Driver
5 *
6 * Copyright (C) 2003 Nokia Corporation
7 * Written by Timo Teräs <ext-timo.teras@nokia.com>
8 *
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/interrupt.h>
29#include <linux/types.h>
30#include <linux/input.h>
31#include <linux/kernel.h>
32#include <linux/delay.h>
33#include <linux/platform_device.h>
34#include <linux/mutex.h>
35#include <linux/errno.h>
36#include <linux/slab.h>
37#include <linux/gpio.h>
38#include <linux/platform_data/gpio-omap.h>
39#include <linux/platform_data/keypad-omap.h>
40
41#undef NEW_BOARD_LEARNING_MODE
42
43static void omap_kp_tasklet(unsigned long);
44static void omap_kp_timer(unsigned long);
45
46static unsigned char keypad_state[8];
47static DEFINE_MUTEX(kp_enable_mutex);
48static int kp_enable = 1;
49static int kp_cur_group = -1;
50
51struct omap_kp {
52 struct input_dev *input;
53 struct timer_list timer;
54 int irq;
55 unsigned int rows;
56 unsigned int cols;
57 unsigned long delay;
58 unsigned int debounce;
59 unsigned short keymap[];
60};
61
62static DECLARE_TASKLET_DISABLED(kp_tasklet, omap_kp_tasklet, 0);
63
64static unsigned int *row_gpios;
65static unsigned int *col_gpios;
66
67#ifdef CONFIG_ARCH_OMAP2
68static void set_col_gpio_val(struct omap_kp *omap_kp, u8 value)
69{
70 int col;
71
72 for (col = 0; col < omap_kp->cols; col++)
73 gpio_set_value(col_gpios[col], value & (1 << col));
74}
75
76static u8 get_row_gpio_val(struct omap_kp *omap_kp)
77{
78 int row;
79 u8 value = 0;
80
81 for (row = 0; row < omap_kp->rows; row++) {
82 if (gpio_get_value(row_gpios[row]))
83 value |= (1 << row);
84 }
85 return value;
86}
87#else
88#define set_col_gpio_val(x, y) do {} while (0)
89#define get_row_gpio_val(x) 0
90#endif
91
92static irqreturn_t omap_kp_interrupt(int irq, void *dev_id)
93{
94 /* disable keyboard interrupt and schedule for handling */
95 omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
96
97 tasklet_schedule(&kp_tasklet);
98
99 return IRQ_HANDLED;
100}
101
102static void omap_kp_timer(unsigned long data)
103{
104 tasklet_schedule(&kp_tasklet);
105}
106
107static void omap_kp_scan_keypad(struct omap_kp *omap_kp, unsigned char *state)
108{
109 int col = 0;
110
111 /* disable keyboard interrupt and schedule for handling */
112 omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
113
114 /* read the keypad status */
115 omap_writew(0xff, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC);
116 for (col = 0; col < omap_kp->cols; col++) {
117 omap_writew(~(1 << col) & 0xff,
118 OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC);
119
120 udelay(omap_kp->delay);
121
122 state[col] = ~omap_readw(OMAP1_MPUIO_BASE +
123 OMAP_MPUIO_KBR_LATCH) & 0xff;
124 }
125 omap_writew(0x00, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC);
126 udelay(2);
127}
128
129static void omap_kp_tasklet(unsigned long data)
130{
131 struct omap_kp *omap_kp_data = (struct omap_kp *) data;
132 unsigned short *keycodes = omap_kp_data->input->keycode;
133 unsigned int row_shift = get_count_order(omap_kp_data->cols);
134 unsigned char new_state[8], changed, key_down = 0;
135 int col, row;
136 int spurious = 0;
137
138 /* check for any changes */
139 omap_kp_scan_keypad(omap_kp_data, new_state);
140
141 /* check for changes and print those */
142 for (col = 0; col < omap_kp_data->cols; col++) {
143 changed = new_state[col] ^ keypad_state[col];
144 key_down |= new_state[col];
145 if (changed == 0)
146 continue;
147
148 for (row = 0; row < omap_kp_data->rows; row++) {
149 int key;
150 if (!(changed & (1 << row)))
151 continue;
152#ifdef NEW_BOARD_LEARNING_MODE
153 printk(KERN_INFO "omap-keypad: key %d-%d %s\n", col,
154 row, (new_state[col] & (1 << row)) ?
155 "pressed" : "released");
156#else
157 key = keycodes[MATRIX_SCAN_CODE(row, col, row_shift)];
158
159 if (!(kp_cur_group == (key & GROUP_MASK) ||
160 kp_cur_group == -1))
161 continue;
162
163 kp_cur_group = key & GROUP_MASK;
164 input_report_key(omap_kp_data->input, key & ~GROUP_MASK,
165 new_state[col] & (1 << row));
166#endif
167 }
168 }
169 input_sync(omap_kp_data->input);
170 memcpy(keypad_state, new_state, sizeof(keypad_state));
171
172 if (key_down) {
173 int delay = HZ / 20;
174 /* some key is pressed - keep irq disabled and use timer
175 * to poll the keypad */
176 if (spurious)
177 delay = 2 * HZ;
178 mod_timer(&omap_kp_data->timer, jiffies + delay);
179 } else {
180 /* enable interrupts */
181 omap_writew(0, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
182 kp_cur_group = -1;
183 }
184}
185
186static ssize_t omap_kp_enable_show(struct device *dev,
187 struct device_attribute *attr, char *buf)
188{
189 return sprintf(buf, "%u\n", kp_enable);
190}
191
192static ssize_t omap_kp_enable_store(struct device *dev, struct device_attribute *attr,
193 const char *buf, size_t count)
194{
195 struct omap_kp *omap_kp = dev_get_drvdata(dev);
196 int state;
197
198 if (sscanf(buf, "%u", &state) != 1)
199 return -EINVAL;
200
201 if ((state != 1) && (state != 0))
202 return -EINVAL;
203
204 mutex_lock(&kp_enable_mutex);
205 if (state != kp_enable) {
206 if (state)
207 enable_irq(omap_kp->irq);
208 else
209 disable_irq(omap_kp->irq);
210 kp_enable = state;
211 }
212 mutex_unlock(&kp_enable_mutex);
213
214 return strnlen(buf, count);
215}
216
217static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, omap_kp_enable_show, omap_kp_enable_store);
218
219#ifdef CONFIG_PM
220static int omap_kp_suspend(struct platform_device *dev, pm_message_t state)
221{
222 /* Nothing yet */
223
224 return 0;
225}
226
227static int omap_kp_resume(struct platform_device *dev)
228{
229 /* Nothing yet */
230
231 return 0;
232}
233#else
234#define omap_kp_suspend NULL
235#define omap_kp_resume NULL
236#endif
237
238static int omap_kp_probe(struct platform_device *pdev)
239{
240 struct omap_kp *omap_kp;
241 struct input_dev *input_dev;
242 struct omap_kp_platform_data *pdata = dev_get_platdata(&pdev->dev);
243 int i, col_idx, row_idx, ret;
244 unsigned int row_shift, keycodemax;
245
246 if (!pdata->rows || !pdata->cols || !pdata->keymap_data) {
247 printk(KERN_ERR "No rows, cols or keymap_data from pdata\n");
248 return -EINVAL;
249 }
250
251 row_shift = get_count_order(pdata->cols);
252 keycodemax = pdata->rows << row_shift;
253
254 omap_kp = kzalloc(sizeof(struct omap_kp) +
255 keycodemax * sizeof(unsigned short), GFP_KERNEL);
256 input_dev = input_allocate_device();
257 if (!omap_kp || !input_dev) {
258 kfree(omap_kp);
259 input_free_device(input_dev);
260 return -ENOMEM;
261 }
262
263 platform_set_drvdata(pdev, omap_kp);
264
265 omap_kp->input = input_dev;
266
267 /* Disable the interrupt for the MPUIO keyboard */
268 omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
269
270 if (pdata->delay)
271 omap_kp->delay = pdata->delay;
272
273 if (pdata->row_gpios && pdata->col_gpios) {
274 row_gpios = pdata->row_gpios;
275 col_gpios = pdata->col_gpios;
276 }
277
278 omap_kp->rows = pdata->rows;
279 omap_kp->cols = pdata->cols;
280
281 col_idx = 0;
282 row_idx = 0;
283
284 setup_timer(&omap_kp->timer, omap_kp_timer, (unsigned long)omap_kp);
285
286 /* get the irq and init timer*/
287 kp_tasklet.data = (unsigned long) omap_kp;
288 tasklet_enable(&kp_tasklet);
289
290 ret = device_create_file(&pdev->dev, &dev_attr_enable);
291 if (ret < 0)
292 goto err2;
293
294 /* setup input device */
295 input_dev->name = "omap-keypad";
296 input_dev->phys = "omap-keypad/input0";
297 input_dev->dev.parent = &pdev->dev;
298
299 input_dev->id.bustype = BUS_HOST;
300 input_dev->id.vendor = 0x0001;
301 input_dev->id.product = 0x0001;
302 input_dev->id.version = 0x0100;
303
304 if (pdata->rep)
305 __set_bit(EV_REP, input_dev->evbit);
306
307 ret = matrix_keypad_build_keymap(pdata->keymap_data, NULL,
308 pdata->rows, pdata->cols,
309 omap_kp->keymap, input_dev);
310 if (ret < 0)
311 goto err3;
312
313 ret = input_register_device(omap_kp->input);
314 if (ret < 0) {
315 printk(KERN_ERR "Unable to register omap-keypad input device\n");
316 goto err3;
317 }
318
319 if (pdata->dbounce)
320 omap_writew(0xff, OMAP1_MPUIO_BASE + OMAP_MPUIO_GPIO_DEBOUNCING);
321
322 /* scan current status and enable interrupt */
323 omap_kp_scan_keypad(omap_kp, keypad_state);
324 omap_kp->irq = platform_get_irq(pdev, 0);
325 if (omap_kp->irq >= 0) {
326 if (request_irq(omap_kp->irq, omap_kp_interrupt, 0,
327 "omap-keypad", omap_kp) < 0)
328 goto err4;
329 }
330 omap_writew(0, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
331
332 return 0;
333
334err4:
335 input_unregister_device(omap_kp->input);
336 input_dev = NULL;
337err3:
338 device_remove_file(&pdev->dev, &dev_attr_enable);
339err2:
340 for (i = row_idx - 1; i >= 0; i--)
341 gpio_free(row_gpios[i]);
342 for (i = col_idx - 1; i >= 0; i--)
343 gpio_free(col_gpios[i]);
344
345 kfree(omap_kp);
346 input_free_device(input_dev);
347
348 return -EINVAL;
349}
350
351static int omap_kp_remove(struct platform_device *pdev)
352{
353 struct omap_kp *omap_kp = platform_get_drvdata(pdev);
354
355 /* disable keypad interrupt handling */
356 tasklet_disable(&kp_tasklet);
357 omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
358 free_irq(omap_kp->irq, omap_kp);
359
360 del_timer_sync(&omap_kp->timer);
361 tasklet_kill(&kp_tasklet);
362
363 /* unregister everything */
364 input_unregister_device(omap_kp->input);
365
366 kfree(omap_kp);
367
368 return 0;
369}
370
371static struct platform_driver omap_kp_driver = {
372 .probe = omap_kp_probe,
373 .remove = omap_kp_remove,
374 .suspend = omap_kp_suspend,
375 .resume = omap_kp_resume,
376 .driver = {
377 .name = "omap-keypad",
378 },
379};
380module_platform_driver(omap_kp_driver);
381
382MODULE_AUTHOR("Timo Teräs");
383MODULE_DESCRIPTION("OMAP Keypad Driver");
384MODULE_LICENSE("GPL");
385MODULE_ALIAS("platform:omap-keypad");
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * linux/drivers/input/keyboard/omap-keypad.c
4 *
5 * OMAP Keypad Driver
6 *
7 * Copyright (C) 2003 Nokia Corporation
8 * Written by Timo Teräs <ext-timo.teras@nokia.com>
9 *
10 * Added support for H2 & H3 Keypad
11 * Copyright (C) 2004 Texas Instruments
12 */
13
14#include <linux/module.h>
15#include <linux/interrupt.h>
16#include <linux/types.h>
17#include <linux/input.h>
18#include <linux/kernel.h>
19#include <linux/delay.h>
20#include <linux/platform_device.h>
21#include <linux/mutex.h>
22#include <linux/errno.h>
23#include <linux/slab.h>
24#include <linux/platform_data/gpio-omap.h>
25#include <linux/platform_data/keypad-omap.h>
26#include <linux/soc/ti/omap1-io.h>
27
28#undef NEW_BOARD_LEARNING_MODE
29
30static void omap_kp_tasklet(unsigned long);
31static void omap_kp_timer(struct timer_list *);
32
33static unsigned char keypad_state[8];
34static DEFINE_MUTEX(kp_enable_mutex);
35static int kp_enable = 1;
36static int kp_cur_group = -1;
37
38struct omap_kp {
39 struct input_dev *input;
40 struct timer_list timer;
41 int irq;
42 unsigned int rows;
43 unsigned int cols;
44 unsigned long delay;
45 unsigned int debounce;
46 unsigned short keymap[];
47};
48
49static DECLARE_TASKLET_DISABLED_OLD(kp_tasklet, omap_kp_tasklet);
50
51static irqreturn_t omap_kp_interrupt(int irq, void *dev_id)
52{
53 /* disable keyboard interrupt and schedule for handling */
54 omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
55
56 tasklet_schedule(&kp_tasklet);
57
58 return IRQ_HANDLED;
59}
60
61static void omap_kp_timer(struct timer_list *unused)
62{
63 tasklet_schedule(&kp_tasklet);
64}
65
66static void omap_kp_scan_keypad(struct omap_kp *omap_kp, unsigned char *state)
67{
68 int col = 0;
69
70 /* disable keyboard interrupt and schedule for handling */
71 omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
72
73 /* read the keypad status */
74 omap_writew(0xff, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC);
75 for (col = 0; col < omap_kp->cols; col++) {
76 omap_writew(~(1 << col) & 0xff,
77 OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC);
78
79 udelay(omap_kp->delay);
80
81 state[col] = ~omap_readw(OMAP1_MPUIO_BASE +
82 OMAP_MPUIO_KBR_LATCH) & 0xff;
83 }
84 omap_writew(0x00, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC);
85 udelay(2);
86}
87
88static void omap_kp_tasklet(unsigned long data)
89{
90 struct omap_kp *omap_kp_data = (struct omap_kp *) data;
91 unsigned short *keycodes = omap_kp_data->input->keycode;
92 unsigned int row_shift = get_count_order(omap_kp_data->cols);
93 unsigned char new_state[8], changed, key_down = 0;
94 int col, row;
95
96 /* check for any changes */
97 omap_kp_scan_keypad(omap_kp_data, new_state);
98
99 /* check for changes and print those */
100 for (col = 0; col < omap_kp_data->cols; col++) {
101 changed = new_state[col] ^ keypad_state[col];
102 key_down |= new_state[col];
103 if (changed == 0)
104 continue;
105
106 for (row = 0; row < omap_kp_data->rows; row++) {
107 int key;
108 if (!(changed & (1 << row)))
109 continue;
110#ifdef NEW_BOARD_LEARNING_MODE
111 printk(KERN_INFO "omap-keypad: key %d-%d %s\n", col,
112 row, (new_state[col] & (1 << row)) ?
113 "pressed" : "released");
114#else
115 key = keycodes[MATRIX_SCAN_CODE(row, col, row_shift)];
116
117 if (!(kp_cur_group == (key & GROUP_MASK) ||
118 kp_cur_group == -1))
119 continue;
120
121 kp_cur_group = key & GROUP_MASK;
122 input_report_key(omap_kp_data->input, key & ~GROUP_MASK,
123 new_state[col] & (1 << row));
124#endif
125 }
126 }
127 input_sync(omap_kp_data->input);
128 memcpy(keypad_state, new_state, sizeof(keypad_state));
129
130 if (key_down) {
131 /* some key is pressed - keep irq disabled and use timer
132 * to poll the keypad */
133 mod_timer(&omap_kp_data->timer, jiffies + HZ / 20);
134 } else {
135 /* enable interrupts */
136 omap_writew(0, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
137 kp_cur_group = -1;
138 }
139}
140
141static ssize_t omap_kp_enable_show(struct device *dev,
142 struct device_attribute *attr, char *buf)
143{
144 return sprintf(buf, "%u\n", kp_enable);
145}
146
147static ssize_t omap_kp_enable_store(struct device *dev, struct device_attribute *attr,
148 const char *buf, size_t count)
149{
150 struct omap_kp *omap_kp = dev_get_drvdata(dev);
151 int state;
152
153 if (sscanf(buf, "%u", &state) != 1)
154 return -EINVAL;
155
156 if ((state != 1) && (state != 0))
157 return -EINVAL;
158
159 mutex_lock(&kp_enable_mutex);
160 if (state != kp_enable) {
161 if (state)
162 enable_irq(omap_kp->irq);
163 else
164 disable_irq(omap_kp->irq);
165 kp_enable = state;
166 }
167 mutex_unlock(&kp_enable_mutex);
168
169 return strnlen(buf, count);
170}
171
172static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, omap_kp_enable_show, omap_kp_enable_store);
173
174static int omap_kp_probe(struct platform_device *pdev)
175{
176 struct omap_kp *omap_kp;
177 struct input_dev *input_dev;
178 struct omap_kp_platform_data *pdata = dev_get_platdata(&pdev->dev);
179 int ret;
180 unsigned int row_shift, keycodemax;
181
182 if (!pdata->rows || !pdata->cols || !pdata->keymap_data) {
183 printk(KERN_ERR "No rows, cols or keymap_data from pdata\n");
184 return -EINVAL;
185 }
186
187 row_shift = get_count_order(pdata->cols);
188 keycodemax = pdata->rows << row_shift;
189
190 omap_kp = kzalloc(struct_size(omap_kp, keymap, keycodemax), GFP_KERNEL);
191 input_dev = input_allocate_device();
192 if (!omap_kp || !input_dev) {
193 kfree(omap_kp);
194 input_free_device(input_dev);
195 return -ENOMEM;
196 }
197
198 platform_set_drvdata(pdev, omap_kp);
199
200 omap_kp->input = input_dev;
201
202 /* Disable the interrupt for the MPUIO keyboard */
203 omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
204
205 if (pdata->delay)
206 omap_kp->delay = pdata->delay;
207
208 omap_kp->rows = pdata->rows;
209 omap_kp->cols = pdata->cols;
210
211 timer_setup(&omap_kp->timer, omap_kp_timer, 0);
212
213 /* get the irq and init timer*/
214 kp_tasklet.data = (unsigned long) omap_kp;
215 tasklet_enable(&kp_tasklet);
216
217 ret = device_create_file(&pdev->dev, &dev_attr_enable);
218 if (ret < 0)
219 goto err2;
220
221 /* setup input device */
222 input_dev->name = "omap-keypad";
223 input_dev->phys = "omap-keypad/input0";
224 input_dev->dev.parent = &pdev->dev;
225
226 input_dev->id.bustype = BUS_HOST;
227 input_dev->id.vendor = 0x0001;
228 input_dev->id.product = 0x0001;
229 input_dev->id.version = 0x0100;
230
231 if (pdata->rep)
232 __set_bit(EV_REP, input_dev->evbit);
233
234 ret = matrix_keypad_build_keymap(pdata->keymap_data, NULL,
235 pdata->rows, pdata->cols,
236 omap_kp->keymap, input_dev);
237 if (ret < 0)
238 goto err3;
239
240 ret = input_register_device(omap_kp->input);
241 if (ret < 0) {
242 printk(KERN_ERR "Unable to register omap-keypad input device\n");
243 goto err3;
244 }
245
246 if (pdata->dbounce)
247 omap_writew(0xff, OMAP1_MPUIO_BASE + OMAP_MPUIO_GPIO_DEBOUNCING);
248
249 /* scan current status and enable interrupt */
250 omap_kp_scan_keypad(omap_kp, keypad_state);
251 omap_kp->irq = platform_get_irq(pdev, 0);
252 if (omap_kp->irq >= 0) {
253 if (request_irq(omap_kp->irq, omap_kp_interrupt, 0,
254 "omap-keypad", omap_kp) < 0)
255 goto err4;
256 }
257 omap_writew(0, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
258
259 return 0;
260
261err4:
262 input_unregister_device(omap_kp->input);
263 input_dev = NULL;
264err3:
265 device_remove_file(&pdev->dev, &dev_attr_enable);
266err2:
267 kfree(omap_kp);
268 input_free_device(input_dev);
269
270 return -EINVAL;
271}
272
273static void omap_kp_remove(struct platform_device *pdev)
274{
275 struct omap_kp *omap_kp = platform_get_drvdata(pdev);
276
277 /* disable keypad interrupt handling */
278 tasklet_disable(&kp_tasklet);
279 omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
280 free_irq(omap_kp->irq, omap_kp);
281
282 timer_shutdown_sync(&omap_kp->timer);
283 tasklet_kill(&kp_tasklet);
284
285 /* unregister everything */
286 input_unregister_device(omap_kp->input);
287
288 kfree(omap_kp);
289}
290
291static struct platform_driver omap_kp_driver = {
292 .probe = omap_kp_probe,
293 .remove_new = omap_kp_remove,
294 .driver = {
295 .name = "omap-keypad",
296 },
297};
298module_platform_driver(omap_kp_driver);
299
300MODULE_AUTHOR("Timo Teräs");
301MODULE_DESCRIPTION("OMAP Keypad Driver");
302MODULE_LICENSE("GPL");
303MODULE_ALIAS("platform:omap-keypad");