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ad4e09b1 KS |
1 | /* |
2 | * linux/drivers/input/keyboard/omap-keypad.c | |
3 | * | |
4 | * OMAP Keypad Driver | |
5 | * | |
6 | * Copyright (C) 2003 Nokia Corporation | |
96de0e25 | 7 | * Written by Timo Teräs <ext-timo.teras@nokia.com> |
ad4e09b1 KS |
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> | |
ad4e09b1 KS |
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> | |
5a0e3ad6 | 36 | #include <linux/slab.h> |
f799a3d8 TL |
37 | #include <linux/gpio.h> |
38 | #include <linux/platform_data/gpio-omap.h> | |
2203747c | 39 | #include <linux/platform_data/keypad-omap.h> |
ad4e09b1 KS |
40 | |
41 | #undef NEW_BOARD_LEARNING_MODE | |
42 | ||
43 | static void omap_kp_tasklet(unsigned long); | |
44 | static void omap_kp_timer(unsigned long); | |
45 | ||
46 | static unsigned char keypad_state[8]; | |
47 | static DEFINE_MUTEX(kp_enable_mutex); | |
48 | static int kp_enable = 1; | |
49 | static int kp_cur_group = -1; | |
50 | ||
51 | struct 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; | |
1932811f | 59 | unsigned short keymap[]; |
ad4e09b1 KS |
60 | }; |
61 | ||
7c8ad982 | 62 | static DECLARE_TASKLET_DISABLED(kp_tasklet, omap_kp_tasklet, 0); |
ad4e09b1 | 63 | |
ad4e09b1 KS |
64 | static unsigned int *row_gpios; |
65 | static unsigned int *col_gpios; | |
66 | ||
7d12e780 | 67 | static irqreturn_t omap_kp_interrupt(int irq, void *dev_id) |
ad4e09b1 | 68 | { |
ad4e09b1 | 69 | /* disable keyboard interrupt and schedule for handling */ |
f799a3d8 | 70 | omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); |
ad4e09b1 KS |
71 | |
72 | tasklet_schedule(&kp_tasklet); | |
73 | ||
74 | return IRQ_HANDLED; | |
75 | } | |
76 | ||
77 | static void omap_kp_timer(unsigned long data) | |
78 | { | |
79 | tasklet_schedule(&kp_tasklet); | |
80 | } | |
81 | ||
82 | static void omap_kp_scan_keypad(struct omap_kp *omap_kp, unsigned char *state) | |
83 | { | |
84 | int col = 0; | |
85 | ||
f799a3d8 TL |
86 | /* disable keyboard interrupt and schedule for handling */ |
87 | omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); | |
ad4e09b1 | 88 | |
f799a3d8 TL |
89 | /* read the keypad status */ |
90 | omap_writew(0xff, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC); | |
91 | for (col = 0; col < omap_kp->cols; col++) { | |
92 | omap_writew(~(1 << col) & 0xff, | |
93 | OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC); | |
ad4e09b1 | 94 | |
f799a3d8 | 95 | udelay(omap_kp->delay); |
ad4e09b1 | 96 | |
f799a3d8 TL |
97 | state[col] = ~omap_readw(OMAP1_MPUIO_BASE + |
98 | OMAP_MPUIO_KBR_LATCH) & 0xff; | |
ad4e09b1 | 99 | } |
f799a3d8 TL |
100 | omap_writew(0x00, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC); |
101 | udelay(2); | |
ad4e09b1 KS |
102 | } |
103 | ||
ad4e09b1 KS |
104 | static void omap_kp_tasklet(unsigned long data) |
105 | { | |
106 | struct omap_kp *omap_kp_data = (struct omap_kp *) data; | |
da1f026b JK |
107 | unsigned short *keycodes = omap_kp_data->input->keycode; |
108 | unsigned int row_shift = get_count_order(omap_kp_data->cols); | |
ad4e09b1 KS |
109 | unsigned char new_state[8], changed, key_down = 0; |
110 | int col, row; | |
ad4e09b1 KS |
111 | |
112 | /* check for any changes */ | |
113 | omap_kp_scan_keypad(omap_kp_data, new_state); | |
114 | ||
115 | /* check for changes and print those */ | |
116 | for (col = 0; col < omap_kp_data->cols; col++) { | |
117 | changed = new_state[col] ^ keypad_state[col]; | |
118 | key_down |= new_state[col]; | |
119 | if (changed == 0) | |
120 | continue; | |
121 | ||
122 | for (row = 0; row < omap_kp_data->rows; row++) { | |
123 | int key; | |
124 | if (!(changed & (1 << row))) | |
125 | continue; | |
126 | #ifdef NEW_BOARD_LEARNING_MODE | |
127 | printk(KERN_INFO "omap-keypad: key %d-%d %s\n", col, | |
128 | row, (new_state[col] & (1 << row)) ? | |
129 | "pressed" : "released"); | |
130 | #else | |
da1f026b | 131 | key = keycodes[MATRIX_SCAN_CODE(row, col, row_shift)]; |
ad4e09b1 KS |
132 | |
133 | if (!(kp_cur_group == (key & GROUP_MASK) || | |
134 | kp_cur_group == -1)) | |
135 | continue; | |
136 | ||
137 | kp_cur_group = key & GROUP_MASK; | |
138 | input_report_key(omap_kp_data->input, key & ~GROUP_MASK, | |
139 | new_state[col] & (1 << row)); | |
140 | #endif | |
141 | } | |
142 | } | |
b27af563 | 143 | input_sync(omap_kp_data->input); |
ad4e09b1 KS |
144 | memcpy(keypad_state, new_state, sizeof(keypad_state)); |
145 | ||
146 | if (key_down) { | |
ad4e09b1 KS |
147 | /* some key is pressed - keep irq disabled and use timer |
148 | * to poll the keypad */ | |
94016680 | 149 | mod_timer(&omap_kp_data->timer, jiffies + HZ / 20); |
ad4e09b1 KS |
150 | } else { |
151 | /* enable interrupts */ | |
f799a3d8 TL |
152 | omap_writew(0, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); |
153 | kp_cur_group = -1; | |
9360353f | 154 | } |
ad4e09b1 KS |
155 | } |
156 | ||
157 | static ssize_t omap_kp_enable_show(struct device *dev, | |
158 | struct device_attribute *attr, char *buf) | |
159 | { | |
160 | return sprintf(buf, "%u\n", kp_enable); | |
161 | } | |
162 | ||
163 | static ssize_t omap_kp_enable_store(struct device *dev, struct device_attribute *attr, | |
164 | const char *buf, size_t count) | |
165 | { | |
f799a3d8 | 166 | struct omap_kp *omap_kp = dev_get_drvdata(dev); |
ad4e09b1 KS |
167 | int state; |
168 | ||
169 | if (sscanf(buf, "%u", &state) != 1) | |
170 | return -EINVAL; | |
171 | ||
172 | if ((state != 1) && (state != 0)) | |
173 | return -EINVAL; | |
174 | ||
175 | mutex_lock(&kp_enable_mutex); | |
176 | if (state != kp_enable) { | |
177 | if (state) | |
f799a3d8 | 178 | enable_irq(omap_kp->irq); |
ad4e09b1 | 179 | else |
f799a3d8 | 180 | disable_irq(omap_kp->irq); |
ad4e09b1 KS |
181 | kp_enable = state; |
182 | } | |
183 | mutex_unlock(&kp_enable_mutex); | |
184 | ||
185 | return strnlen(buf, count); | |
186 | } | |
187 | ||
188 | static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, omap_kp_enable_show, omap_kp_enable_store); | |
189 | ||
5298cc4c | 190 | static int omap_kp_probe(struct platform_device *pdev) |
ad4e09b1 KS |
191 | { |
192 | struct omap_kp *omap_kp; | |
193 | struct input_dev *input_dev; | |
c838cb3d | 194 | struct omap_kp_platform_data *pdata = dev_get_platdata(&pdev->dev); |
f799a3d8 | 195 | int i, col_idx, row_idx, ret; |
da1f026b | 196 | unsigned int row_shift, keycodemax; |
ad4e09b1 | 197 | |
da1f026b JK |
198 | if (!pdata->rows || !pdata->cols || !pdata->keymap_data) { |
199 | printk(KERN_ERR "No rows, cols or keymap_data from pdata\n"); | |
ad4e09b1 KS |
200 | return -EINVAL; |
201 | } | |
202 | ||
da1f026b JK |
203 | row_shift = get_count_order(pdata->cols); |
204 | keycodemax = pdata->rows << row_shift; | |
205 | ||
206 | omap_kp = kzalloc(sizeof(struct omap_kp) + | |
207 | keycodemax * sizeof(unsigned short), GFP_KERNEL); | |
ad4e09b1 KS |
208 | input_dev = input_allocate_device(); |
209 | if (!omap_kp || !input_dev) { | |
210 | kfree(omap_kp); | |
211 | input_free_device(input_dev); | |
212 | return -ENOMEM; | |
213 | } | |
214 | ||
215 | platform_set_drvdata(pdev, omap_kp); | |
216 | ||
217 | omap_kp->input = input_dev; | |
218 | ||
219 | /* Disable the interrupt for the MPUIO keyboard */ | |
f799a3d8 | 220 | omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); |
ad4e09b1 | 221 | |
ad4e09b1 KS |
222 | if (pdata->delay) |
223 | omap_kp->delay = pdata->delay; | |
224 | ||
225 | if (pdata->row_gpios && pdata->col_gpios) { | |
226 | row_gpios = pdata->row_gpios; | |
227 | col_gpios = pdata->col_gpios; | |
228 | } | |
229 | ||
230 | omap_kp->rows = pdata->rows; | |
231 | omap_kp->cols = pdata->cols; | |
232 | ||
f799a3d8 TL |
233 | col_idx = 0; |
234 | row_idx = 0; | |
ad4e09b1 KS |
235 | |
236 | setup_timer(&omap_kp->timer, omap_kp_timer, (unsigned long)omap_kp); | |
237 | ||
238 | /* get the irq and init timer*/ | |
ad4e09b1 | 239 | kp_tasklet.data = (unsigned long) omap_kp; |
7ae6cfe8 | 240 | tasklet_enable(&kp_tasklet); |
ad4e09b1 KS |
241 | |
242 | ret = device_create_file(&pdev->dev, &dev_attr_enable); | |
243 | if (ret < 0) | |
244 | goto err2; | |
245 | ||
246 | /* setup input device */ | |
ad4e09b1 KS |
247 | input_dev->name = "omap-keypad"; |
248 | input_dev->phys = "omap-keypad/input0"; | |
469ba4df | 249 | input_dev->dev.parent = &pdev->dev; |
ad4e09b1 KS |
250 | |
251 | input_dev->id.bustype = BUS_HOST; | |
252 | input_dev->id.vendor = 0x0001; | |
253 | input_dev->id.product = 0x0001; | |
254 | input_dev->id.version = 0x0100; | |
255 | ||
1932811f DT |
256 | if (pdata->rep) |
257 | __set_bit(EV_REP, input_dev->evbit); | |
258 | ||
259 | ret = matrix_keypad_build_keymap(pdata->keymap_data, NULL, | |
260 | pdata->rows, pdata->cols, | |
261 | omap_kp->keymap, input_dev); | |
262 | if (ret < 0) | |
263 | goto err3; | |
264 | ||
ad4e09b1 KS |
265 | ret = input_register_device(omap_kp->input); |
266 | if (ret < 0) { | |
267 | printk(KERN_ERR "Unable to register omap-keypad input device\n"); | |
268 | goto err3; | |
269 | } | |
270 | ||
271 | if (pdata->dbounce) | |
6175556f | 272 | omap_writew(0xff, OMAP1_MPUIO_BASE + OMAP_MPUIO_GPIO_DEBOUNCING); |
ad4e09b1 KS |
273 | |
274 | /* scan current status and enable interrupt */ | |
275 | omap_kp_scan_keypad(omap_kp, keypad_state); | |
f799a3d8 TL |
276 | omap_kp->irq = platform_get_irq(pdev, 0); |
277 | if (omap_kp->irq >= 0) { | |
278 | if (request_irq(omap_kp->irq, omap_kp_interrupt, 0, | |
279 | "omap-keypad", omap_kp) < 0) | |
280 | goto err4; | |
ad4e09b1 | 281 | } |
f799a3d8 TL |
282 | omap_writew(0, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); |
283 | ||
ad4e09b1 | 284 | return 0; |
f799a3d8 | 285 | |
ad4e09b1 KS |
286 | err4: |
287 | input_unregister_device(omap_kp->input); | |
288 | input_dev = NULL; | |
289 | err3: | |
290 | device_remove_file(&pdev->dev, &dev_attr_enable); | |
291 | err2: | |
9e14f36b | 292 | for (i = row_idx - 1; i >= 0; i--) |
93a22f8b | 293 | gpio_free(row_gpios[i]); |
9e14f36b | 294 | for (i = col_idx - 1; i >= 0; i--) |
93a22f8b | 295 | gpio_free(col_gpios[i]); |
ad4e09b1 KS |
296 | |
297 | kfree(omap_kp); | |
298 | input_free_device(input_dev); | |
299 | ||
300 | return -EINVAL; | |
301 | } | |
302 | ||
e2619cf7 | 303 | static int omap_kp_remove(struct platform_device *pdev) |
ad4e09b1 KS |
304 | { |
305 | struct omap_kp *omap_kp = platform_get_drvdata(pdev); | |
306 | ||
307 | /* disable keypad interrupt handling */ | |
308 | tasklet_disable(&kp_tasklet); | |
f799a3d8 TL |
309 | omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); |
310 | free_irq(omap_kp->irq, omap_kp); | |
ad4e09b1 KS |
311 | |
312 | del_timer_sync(&omap_kp->timer); | |
313 | tasklet_kill(&kp_tasklet); | |
314 | ||
315 | /* unregister everything */ | |
316 | input_unregister_device(omap_kp->input); | |
317 | ||
318 | kfree(omap_kp); | |
319 | ||
320 | return 0; | |
321 | } | |
322 | ||
323 | static struct platform_driver omap_kp_driver = { | |
324 | .probe = omap_kp_probe, | |
1cb0aa88 | 325 | .remove = omap_kp_remove, |
ad4e09b1 KS |
326 | .driver = { |
327 | .name = "omap-keypad", | |
328 | }, | |
329 | }; | |
5146c84f | 330 | module_platform_driver(omap_kp_driver); |
ad4e09b1 | 331 | |
96de0e25 | 332 | MODULE_AUTHOR("Timo Teräs"); |
ad4e09b1 KS |
333 | MODULE_DESCRIPTION("OMAP Keypad Driver"); |
334 | MODULE_LICENSE("GPL"); | |
d7b5247b | 335 | MODULE_ALIAS("platform:omap-keypad"); |