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Linux/drivers/input/keyboard/omap4-keypad.c

  1 /*
  2  * OMAP4 Keypad Driver
  3  *
  4  * Copyright (C) 2010 Texas Instruments
  5  *
  6  * Author: Abraham Arce <x0066660@ti.com>
  7  * Initial Code: Syed Rafiuddin <rafiuddin.syed@ti.com>
  8  *
  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.
 13  *
 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.
 18  *
 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
 22  */
 23 
 24 #include <linux/module.h>
 25 #include <linux/interrupt.h>
 26 #include <linux/platform_device.h>
 27 #include <linux/errno.h>
 28 #include <linux/io.h>
 29 #include <linux/of.h>
 30 #include <linux/input.h>
 31 #include <linux/input/matrix_keypad.h>
 32 #include <linux/slab.h>
 33 #include <linux/pm_runtime.h>
 34 
 35 /* OMAP4 registers */
 36 #define OMAP4_KBD_REVISION              0x00
 37 #define OMAP4_KBD_SYSCONFIG             0x10
 38 #define OMAP4_KBD_SYSSTATUS             0x14
 39 #define OMAP4_KBD_IRQSTATUS             0x18
 40 #define OMAP4_KBD_IRQENABLE             0x1C
 41 #define OMAP4_KBD_WAKEUPENABLE          0x20
 42 #define OMAP4_KBD_PENDING               0x24
 43 #define OMAP4_KBD_CTRL                  0x28
 44 #define OMAP4_KBD_DEBOUNCINGTIME        0x2C
 45 #define OMAP4_KBD_LONGKEYTIME           0x30
 46 #define OMAP4_KBD_TIMEOUT               0x34
 47 #define OMAP4_KBD_STATEMACHINE          0x38
 48 #define OMAP4_KBD_ROWINPUTS             0x3C
 49 #define OMAP4_KBD_COLUMNOUTPUTS         0x40
 50 #define OMAP4_KBD_FULLCODE31_0          0x44
 51 #define OMAP4_KBD_FULLCODE63_32         0x48
 52 
 53 /* OMAP4 bit definitions */
 54 #define OMAP4_DEF_IRQENABLE_EVENTEN     BIT(0)
 55 #define OMAP4_DEF_IRQENABLE_LONGKEY     BIT(1)
 56 #define OMAP4_DEF_WUP_EVENT_ENA         BIT(0)
 57 #define OMAP4_DEF_WUP_LONG_KEY_ENA      BIT(1)
 58 #define OMAP4_DEF_CTRL_NOSOFTMODE       BIT(1)
 59 #define OMAP4_DEF_CTRL_PTV_SHIFT        2
 60 
 61 /* OMAP4 values */
 62 #define OMAP4_VAL_IRQDISABLE            0x0
 63 #define OMAP4_VAL_DEBOUNCINGTIME        0x7
 64 #define OMAP4_VAL_PVT                   0x7
 65 
 66 enum {
 67         KBD_REVISION_OMAP4 = 0,
 68         KBD_REVISION_OMAP5,
 69 };
 70 
 71 struct omap4_keypad {
 72         struct input_dev *input;
 73 
 74         void __iomem *base;
 75         bool irq_wake_enabled;
 76         unsigned int irq;
 77 
 78         unsigned int rows;
 79         unsigned int cols;
 80         u32 reg_offset;
 81         u32 irqreg_offset;
 82         unsigned int row_shift;
 83         bool no_autorepeat;
 84         unsigned char key_state[8];
 85         unsigned short *keymap;
 86 };
 87 
 88 static int kbd_readl(struct omap4_keypad *keypad_data, u32 offset)
 89 {
 90         return __raw_readl(keypad_data->base +
 91                                 keypad_data->reg_offset + offset);
 92 }
 93 
 94 static void kbd_writel(struct omap4_keypad *keypad_data, u32 offset, u32 value)
 95 {
 96         __raw_writel(value,
 97                      keypad_data->base + keypad_data->reg_offset + offset);
 98 }
 99 
100 static int kbd_read_irqreg(struct omap4_keypad *keypad_data, u32 offset)
101 {
102         return __raw_readl(keypad_data->base +
103                                 keypad_data->irqreg_offset + offset);
104 }
105 
106 static void kbd_write_irqreg(struct omap4_keypad *keypad_data,
107                              u32 offset, u32 value)
108 {
109         __raw_writel(value,
110                      keypad_data->base + keypad_data->irqreg_offset + offset);
111 }
112 
113 
114 /* Interrupt handlers */
115 static irqreturn_t omap4_keypad_irq_handler(int irq, void *dev_id)
116 {
117         struct omap4_keypad *keypad_data = dev_id;
118 
119         if (kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS)) {
120                 /* Disable interrupts */
121                 kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
122                                  OMAP4_VAL_IRQDISABLE);
123                 return IRQ_WAKE_THREAD;
124         }
125 
126         return IRQ_NONE;
127 }
128 
129 static irqreturn_t omap4_keypad_irq_thread_fn(int irq, void *dev_id)
130 {
131         struct omap4_keypad *keypad_data = dev_id;
132         struct input_dev *input_dev = keypad_data->input;
133         unsigned char key_state[ARRAY_SIZE(keypad_data->key_state)];
134         unsigned int col, row, code, changed;
135         u32 *new_state = (u32 *) key_state;
136 
137         *new_state = kbd_readl(keypad_data, OMAP4_KBD_FULLCODE31_0);
138         *(new_state + 1) = kbd_readl(keypad_data, OMAP4_KBD_FULLCODE63_32);
139 
140         for (row = 0; row < keypad_data->rows; row++) {
141                 changed = key_state[row] ^ keypad_data->key_state[row];
142                 if (!changed)
143                         continue;
144 
145                 for (col = 0; col < keypad_data->cols; col++) {
146                         if (changed & (1 << col)) {
147                                 code = MATRIX_SCAN_CODE(row, col,
148                                                 keypad_data->row_shift);
149                                 input_event(input_dev, EV_MSC, MSC_SCAN, code);
150                                 input_report_key(input_dev,
151                                                  keypad_data->keymap[code],
152                                                  key_state[row] & (1 << col));
153                         }
154                 }
155         }
156 
157         input_sync(input_dev);
158 
159         memcpy(keypad_data->key_state, key_state,
160                 sizeof(keypad_data->key_state));
161 
162         /* clear pending interrupts */
163         kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
164                          kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS));
165 
166         /* enable interrupts */
167         kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
168                 OMAP4_DEF_IRQENABLE_EVENTEN |
169                                 OMAP4_DEF_IRQENABLE_LONGKEY);
170 
171         return IRQ_HANDLED;
172 }
173 
174 static int omap4_keypad_open(struct input_dev *input)
175 {
176         struct omap4_keypad *keypad_data = input_get_drvdata(input);
177 
178         pm_runtime_get_sync(input->dev.parent);
179 
180         disable_irq(keypad_data->irq);
181 
182         kbd_writel(keypad_data, OMAP4_KBD_CTRL,
183                         OMAP4_DEF_CTRL_NOSOFTMODE |
184                         (OMAP4_VAL_PVT << OMAP4_DEF_CTRL_PTV_SHIFT));
185         kbd_writel(keypad_data, OMAP4_KBD_DEBOUNCINGTIME,
186                         OMAP4_VAL_DEBOUNCINGTIME);
187         /* clear pending interrupts */
188         kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
189                          kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS));
190         kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
191                         OMAP4_DEF_IRQENABLE_EVENTEN |
192                                 OMAP4_DEF_IRQENABLE_LONGKEY);
193         kbd_writel(keypad_data, OMAP4_KBD_WAKEUPENABLE,
194                         OMAP4_DEF_WUP_EVENT_ENA | OMAP4_DEF_WUP_LONG_KEY_ENA);
195 
196         enable_irq(keypad_data->irq);
197 
198         return 0;
199 }
200 
201 static void omap4_keypad_close(struct input_dev *input)
202 {
203         struct omap4_keypad *keypad_data = input_get_drvdata(input);
204 
205         disable_irq(keypad_data->irq);
206 
207         /* Disable interrupts */
208         kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
209                          OMAP4_VAL_IRQDISABLE);
210 
211         /* clear pending interrupts */
212         kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
213                          kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS));
214 
215         enable_irq(keypad_data->irq);
216 
217         pm_runtime_put_sync(input->dev.parent);
218 }
219 
220 static int omap4_keypad_parse_dt(struct device *dev,
221                                  struct omap4_keypad *keypad_data)
222 {
223         struct device_node *np = dev->of_node;
224         int err;
225 
226         err = matrix_keypad_parse_of_params(dev, &keypad_data->rows,
227                                             &keypad_data->cols);
228         if (err)
229                 return err;
230 
231         if (of_get_property(np, "linux,input-no-autorepeat", NULL))
232                 keypad_data->no_autorepeat = true;
233 
234         return 0;
235 }
236 
237 static int omap4_keypad_probe(struct platform_device *pdev)
238 {
239         struct omap4_keypad *keypad_data;
240         struct input_dev *input_dev;
241         struct resource *res;
242         unsigned int max_keys;
243         int rev;
244         int irq;
245         int error;
246 
247         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
248         if (!res) {
249                 dev_err(&pdev->dev, "no base address specified\n");
250                 return -EINVAL;
251         }
252 
253         irq = platform_get_irq(pdev, 0);
254         if (!irq) {
255                 dev_err(&pdev->dev, "no keyboard irq assigned\n");
256                 return -EINVAL;
257         }
258 
259         keypad_data = kzalloc(sizeof(struct omap4_keypad), GFP_KERNEL);
260         if (!keypad_data) {
261                 dev_err(&pdev->dev, "keypad_data memory allocation failed\n");
262                 return -ENOMEM;
263         }
264 
265         keypad_data->irq = irq;
266 
267         error = omap4_keypad_parse_dt(&pdev->dev, keypad_data);
268         if (error)
269                 return error;
270 
271         res = request_mem_region(res->start, resource_size(res), pdev->name);
272         if (!res) {
273                 dev_err(&pdev->dev, "can't request mem region\n");
274                 error = -EBUSY;
275                 goto err_free_keypad;
276         }
277 
278         keypad_data->base = ioremap(res->start, resource_size(res));
279         if (!keypad_data->base) {
280                 dev_err(&pdev->dev, "can't ioremap mem resource\n");
281                 error = -ENOMEM;
282                 goto err_release_mem;
283         }
284 
285 
286         /*
287          * Enable clocks for the keypad module so that we can read
288          * revision register.
289          */
290         pm_runtime_enable(&pdev->dev);
291         error = pm_runtime_get_sync(&pdev->dev);
292         if (error) {
293                 dev_err(&pdev->dev, "pm_runtime_get_sync() failed\n");
294                 goto err_unmap;
295         }
296         rev = __raw_readl(keypad_data->base + OMAP4_KBD_REVISION);
297         rev &= 0x03 << 30;
298         rev >>= 30;
299         switch (rev) {
300         case KBD_REVISION_OMAP4:
301                 keypad_data->reg_offset = 0x00;
302                 keypad_data->irqreg_offset = 0x00;
303                 break;
304         case KBD_REVISION_OMAP5:
305                 keypad_data->reg_offset = 0x10;
306                 keypad_data->irqreg_offset = 0x0c;
307                 break;
308         default:
309                 dev_err(&pdev->dev,
310                         "Keypad reports unsupported revision %d", rev);
311                 error = -EINVAL;
312                 goto err_pm_put_sync;
313         }
314 
315         /* input device allocation */
316         keypad_data->input = input_dev = input_allocate_device();
317         if (!input_dev) {
318                 error = -ENOMEM;
319                 goto err_pm_put_sync;
320         }
321 
322         input_dev->name = pdev->name;
323         input_dev->dev.parent = &pdev->dev;
324         input_dev->id.bustype = BUS_HOST;
325         input_dev->id.vendor = 0x0001;
326         input_dev->id.product = 0x0001;
327         input_dev->id.version = 0x0001;
328 
329         input_dev->open = omap4_keypad_open;
330         input_dev->close = omap4_keypad_close;
331 
332         input_set_capability(input_dev, EV_MSC, MSC_SCAN);
333         if (!keypad_data->no_autorepeat)
334                 __set_bit(EV_REP, input_dev->evbit);
335 
336         input_set_drvdata(input_dev, keypad_data);
337 
338         keypad_data->row_shift = get_count_order(keypad_data->cols);
339         max_keys = keypad_data->rows << keypad_data->row_shift;
340         keypad_data->keymap = kzalloc(max_keys * sizeof(keypad_data->keymap[0]),
341                                       GFP_KERNEL);
342         if (!keypad_data->keymap) {
343                 dev_err(&pdev->dev, "Not enough memory for keymap\n");
344                 error = -ENOMEM;
345                 goto err_free_input;
346         }
347 
348         error = matrix_keypad_build_keymap(NULL, NULL,
349                                            keypad_data->rows, keypad_data->cols,
350                                            keypad_data->keymap, input_dev);
351         if (error) {
352                 dev_err(&pdev->dev, "failed to build keymap\n");
353                 goto err_free_keymap;
354         }
355 
356         error = request_threaded_irq(keypad_data->irq, omap4_keypad_irq_handler,
357                                      omap4_keypad_irq_thread_fn, 0,
358                                      "omap4-keypad", keypad_data);
359         if (error) {
360                 dev_err(&pdev->dev, "failed to register interrupt\n");
361                 goto err_free_input;
362         }
363 
364         device_init_wakeup(&pdev->dev, true);
365         pm_runtime_put_sync(&pdev->dev);
366 
367         error = input_register_device(keypad_data->input);
368         if (error < 0) {
369                 dev_err(&pdev->dev, "failed to register input device\n");
370                 goto err_pm_disable;
371         }
372 
373         platform_set_drvdata(pdev, keypad_data);
374         return 0;
375 
376 err_pm_disable:
377         pm_runtime_disable(&pdev->dev);
378         device_init_wakeup(&pdev->dev, false);
379         free_irq(keypad_data->irq, keypad_data);
380 err_free_keymap:
381         kfree(keypad_data->keymap);
382 err_free_input:
383         input_free_device(input_dev);
384 err_pm_put_sync:
385         pm_runtime_put_sync(&pdev->dev);
386 err_unmap:
387         iounmap(keypad_data->base);
388 err_release_mem:
389         release_mem_region(res->start, resource_size(res));
390 err_free_keypad:
391         kfree(keypad_data);
392         return error;
393 }
394 
395 static int omap4_keypad_remove(struct platform_device *pdev)
396 {
397         struct omap4_keypad *keypad_data = platform_get_drvdata(pdev);
398         struct resource *res;
399 
400         free_irq(keypad_data->irq, keypad_data);
401 
402         pm_runtime_disable(&pdev->dev);
403 
404         device_init_wakeup(&pdev->dev, false);
405 
406         input_unregister_device(keypad_data->input);
407 
408         iounmap(keypad_data->base);
409 
410         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
411         release_mem_region(res->start, resource_size(res));
412 
413         kfree(keypad_data->keymap);
414         kfree(keypad_data);
415 
416         return 0;
417 }
418 
419 static const struct of_device_id omap_keypad_dt_match[] = {
420         { .compatible = "ti,omap4-keypad" },
421         {},
422 };
423 MODULE_DEVICE_TABLE(of, omap_keypad_dt_match);
424 
425 #ifdef CONFIG_PM_SLEEP
426 static int omap4_keypad_suspend(struct device *dev)
427 {
428         struct platform_device *pdev = to_platform_device(dev);
429         struct omap4_keypad *keypad_data = platform_get_drvdata(pdev);
430         int error;
431 
432         if (device_may_wakeup(&pdev->dev)) {
433                 error = enable_irq_wake(keypad_data->irq);
434                 if (!error)
435                         keypad_data->irq_wake_enabled = true;
436         }
437 
438         return 0;
439 }
440 
441 static int omap4_keypad_resume(struct device *dev)
442 {
443         struct platform_device *pdev = to_platform_device(dev);
444         struct omap4_keypad *keypad_data = platform_get_drvdata(pdev);
445 
446         if (device_may_wakeup(&pdev->dev) && keypad_data->irq_wake_enabled) {
447                 disable_irq_wake(keypad_data->irq);
448                 keypad_data->irq_wake_enabled = false;
449         }
450 
451         return 0;
452 }
453 #endif
454 
455 static SIMPLE_DEV_PM_OPS(omap4_keypad_pm_ops,
456                          omap4_keypad_suspend, omap4_keypad_resume);
457 
458 static struct platform_driver omap4_keypad_driver = {
459         .probe          = omap4_keypad_probe,
460         .remove         = omap4_keypad_remove,
461         .driver         = {
462                 .name   = "omap4-keypad",
463                 .owner  = THIS_MODULE,
464                 .pm     = &omap4_keypad_pm_ops,
465                 .of_match_table = omap_keypad_dt_match,
466         },
467 };
468 module_platform_driver(omap4_keypad_driver);
469 
470 MODULE_AUTHOR("Texas Instruments");
471 MODULE_DESCRIPTION("OMAP4 Keypad Driver");
472 MODULE_LICENSE("GPL");
473 MODULE_ALIAS("platform:omap4-keypad");
474 

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