2 * linux/drivers/input/keyboard/pxa27x_keypad.c
4 * Driver for the pxa27x matrix keyboard controller.
6 * Created: Feb 22, 2007
7 * Author: Rodolfo Giometti <giometti@linux.it>
9 * Based on a previous implementations by Kevin O'Connor
10 * <kevin_at_koconnor.net> and Alex Osborne <bobofdoom@gmail.com> and
11 * on some suggestions by Nicolas Pitre <nico@cam.org>.
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License version 2 as
15 * published by the Free Software Foundation.
19 #include <linux/kernel.h>
20 #include <linux/module.h>
21 #include <linux/init.h>
22 #include <linux/interrupt.h>
23 #include <linux/input.h>
24 #include <linux/device.h>
25 #include <linux/platform_device.h>
26 #include <linux/clk.h>
27 #include <linux/err.h>
29 #include <asm/mach-types.h>
30 #include <asm/mach/arch.h>
31 #include <asm/mach/map.h>
33 #include <asm/arch/hardware.h>
34 #include <asm/arch/pxa27x_keypad.h>
37 * Keypad Controller registers
39 #define KPC 0x0000 /* Keypad Control register */
40 #define KPDK 0x0008 /* Keypad Direct Key register */
41 #define KPREC 0x0010 /* Keypad Rotary Encoder register */
42 #define KPMK 0x0018 /* Keypad Matrix Key register */
43 #define KPAS 0x0020 /* Keypad Automatic Scan register */
45 /* Keypad Automatic Scan Multiple Key Presser register 0-3 */
46 #define KPASMKP0 0x0028
47 #define KPASMKP1 0x0030
48 #define KPASMKP2 0x0038
49 #define KPASMKP3 0x0040
53 #define KPC_MKRN(n) ((((n) - 1) & 0x7) << 26) /* matrix key row number */
54 #define KPC_MKCN(n) ((((n) - 1) & 0x7) << 23) /* matrix key column number */
55 #define KPC_DKN(n) ((((n) - 1) & 0x7) << 6) /* direct key number */
57 #define KPC_AS (0x1 << 30) /* Automatic Scan bit */
58 #define KPC_ASACT (0x1 << 29) /* Automatic Scan on Activity */
59 #define KPC_MI (0x1 << 22) /* Matrix interrupt bit */
60 #define KPC_IMKP (0x1 << 21) /* Ignore Multiple Key Press */
62 #define KPC_MS(n) (0x1 << (13 + (n))) /* Matrix scan line 'n' */
63 #define KPC_MS_ALL (0xff << 13)
65 #define KPC_ME (0x1 << 12) /* Matrix Keypad Enable */
66 #define KPC_MIE (0x1 << 11) /* Matrix Interrupt Enable */
67 #define KPC_DK_DEB_SEL (0x1 << 9) /* Direct Keypad Debounce Select */
68 #define KPC_DI (0x1 << 5) /* Direct key interrupt bit */
69 #define KPC_RE_ZERO_DEB (0x1 << 4) /* Rotary Encoder Zero Debounce */
70 #define KPC_REE1 (0x1 << 3) /* Rotary Encoder1 Enable */
71 #define KPC_REE0 (0x1 << 2) /* Rotary Encoder0 Enable */
72 #define KPC_DE (0x1 << 1) /* Direct Keypad Enable */
73 #define KPC_DIE (0x1 << 0) /* Direct Keypad interrupt Enable */
75 #define KPDK_DKP (0x1 << 31)
76 #define KPDK_DK(n) ((n) & 0xff)
78 #define KPREC_OF1 (0x1 << 31)
79 #define kPREC_UF1 (0x1 << 30)
80 #define KPREC_OF0 (0x1 << 15)
81 #define KPREC_UF0 (0x1 << 14)
83 #define KPREC_RECOUNT0(n) ((n) & 0xff)
84 #define KPREC_RECOUNT1(n) (((n) >> 16) & 0xff)
86 #define KPMK_MKP (0x1 << 31)
87 #define KPAS_SO (0x1 << 31)
88 #define KPASMKPx_SO (0x1 << 31)
90 #define KPAS_MUKP(n) (((n) >> 26) & 0x1f)
91 #define KPAS_RP(n) (((n) >> 4) & 0xf)
92 #define KPAS_CP(n) ((n) & 0xf)
94 #define KPASMKP_MKC_MASK (0xff)
96 #define keypad_readl(off) __raw_readl(keypad->mmio_base + (off))
97 #define keypad_writel(off, v) __raw_writel((v), keypad->mmio_base + (off))
99 #define MAX_MATRIX_KEY_NUM (8 * 8)
101 struct pxa27x_keypad {
102 struct pxa27x_keypad_platform_data *pdata;
105 struct input_dev *input_dev;
106 void __iomem *mmio_base;
108 /* matrix key code map */
109 unsigned int matrix_keycodes[MAX_MATRIX_KEY_NUM];
111 /* state row bits of each column scan */
112 uint32_t matrix_key_state[MAX_MATRIX_KEY_COLS];
113 uint32_t direct_key_state;
115 unsigned int direct_key_mask;
117 int rotary_rel_code[2];
118 int rotary_up_key[2];
119 int rotary_down_key[2];
122 static void pxa27x_keypad_build_keycode(struct pxa27x_keypad *keypad)
124 struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
125 struct input_dev *input_dev = keypad->input_dev;
129 key = &pdata->matrix_key_map[0];
130 for (i = 0; i < pdata->matrix_key_map_size; i++, key++) {
131 int row = ((*key) >> 28) & 0xf;
132 int col = ((*key) >> 24) & 0xf;
133 int code = (*key) & 0xffffff;
135 keypad->matrix_keycodes[(row << 3) + col] = code;
136 set_bit(code, input_dev->keybit);
139 for (i = 0; i < pdata->direct_key_num; i++)
140 set_bit(pdata->direct_key_map[i], input_dev->keybit);
142 keypad->rotary_up_key[0] = pdata->rotary0_up_key;
143 keypad->rotary_up_key[1] = pdata->rotary1_up_key;
144 keypad->rotary_down_key[0] = pdata->rotary0_down_key;
145 keypad->rotary_down_key[1] = pdata->rotary1_down_key;
146 keypad->rotary_rel_code[0] = pdata->rotary0_rel_code;
147 keypad->rotary_rel_code[1] = pdata->rotary1_rel_code;
149 if (pdata->enable_rotary0) {
150 if (pdata->rotary0_up_key && pdata->rotary0_down_key) {
151 set_bit(pdata->rotary0_up_key, input_dev->keybit);
152 set_bit(pdata->rotary0_down_key, input_dev->keybit);
154 set_bit(pdata->rotary0_rel_code, input_dev->relbit);
157 if (pdata->enable_rotary1) {
158 if (pdata->rotary1_up_key && pdata->rotary1_down_key) {
159 set_bit(pdata->rotary1_up_key, input_dev->keybit);
160 set_bit(pdata->rotary1_down_key, input_dev->keybit);
162 set_bit(pdata->rotary1_rel_code, input_dev->relbit);
166 static inline unsigned int lookup_matrix_keycode(
167 struct pxa27x_keypad *keypad, int row, int col)
169 return keypad->matrix_keycodes[(row << 3) + col];
172 static void pxa27x_keypad_scan_matrix(struct pxa27x_keypad *keypad)
174 struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
175 int row, col, num_keys_pressed = 0;
176 uint32_t new_state[MAX_MATRIX_KEY_COLS];
177 uint32_t kpas = keypad_readl(KPAS);
179 num_keys_pressed = KPAS_MUKP(kpas);
181 memset(new_state, 0, sizeof(new_state));
183 if (num_keys_pressed == 0)
186 if (num_keys_pressed == 1) {
190 /* if invalid row/col, treat as no key pressed */
191 if (col >= pdata->matrix_key_cols ||
192 row >= pdata->matrix_key_rows)
195 new_state[col] = (1 << row);
199 if (num_keys_pressed > 1) {
200 uint32_t kpasmkp0 = keypad_readl(KPASMKP0);
201 uint32_t kpasmkp1 = keypad_readl(KPASMKP1);
202 uint32_t kpasmkp2 = keypad_readl(KPASMKP2);
203 uint32_t kpasmkp3 = keypad_readl(KPASMKP3);
205 new_state[0] = kpasmkp0 & KPASMKP_MKC_MASK;
206 new_state[1] = (kpasmkp0 >> 16) & KPASMKP_MKC_MASK;
207 new_state[2] = kpasmkp1 & KPASMKP_MKC_MASK;
208 new_state[3] = (kpasmkp1 >> 16) & KPASMKP_MKC_MASK;
209 new_state[4] = kpasmkp2 & KPASMKP_MKC_MASK;
210 new_state[5] = (kpasmkp2 >> 16) & KPASMKP_MKC_MASK;
211 new_state[6] = kpasmkp3 & KPASMKP_MKC_MASK;
212 new_state[7] = (kpasmkp3 >> 16) & KPASMKP_MKC_MASK;
215 for (col = 0; col < pdata->matrix_key_cols; col++) {
216 uint32_t bits_changed;
218 bits_changed = keypad->matrix_key_state[col] ^ new_state[col];
219 if (bits_changed == 0)
222 for (row = 0; row < pdata->matrix_key_rows; row++) {
223 if ((bits_changed & (1 << row)) == 0)
226 input_report_key(keypad->input_dev,
227 lookup_matrix_keycode(keypad, row, col),
228 new_state[col] & (1 << row));
231 input_sync(keypad->input_dev);
232 memcpy(keypad->matrix_key_state, new_state, sizeof(new_state));
235 #define DEFAULT_KPREC (0x007f007f)
237 static inline int rotary_delta(uint32_t kprec)
239 if (kprec & KPREC_OF0)
240 return (kprec & 0xff) + 0x7f;
241 else if (kprec & KPREC_UF0)
242 return (kprec & 0xff) - 0x7f - 0xff;
244 return (kprec & 0xff) - 0x7f;
247 static void report_rotary_event(struct pxa27x_keypad *keypad, int r, int delta)
249 struct input_dev *dev = keypad->input_dev;
254 if (keypad->rotary_up_key[r] && keypad->rotary_down_key[r]) {
255 int keycode = (delta > 0) ? keypad->rotary_up_key[r] :
256 keypad->rotary_down_key[r];
258 /* simulate a press-n-release */
259 input_report_key(dev, keycode, 1);
261 input_report_key(dev, keycode, 0);
264 input_report_rel(dev, keypad->rotary_rel_code[r], delta);
269 static void pxa27x_keypad_scan_rotary(struct pxa27x_keypad *keypad)
271 struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
274 /* read and reset to default count value */
275 kprec = keypad_readl(KPREC);
276 keypad_writel(KPREC, DEFAULT_KPREC);
278 if (pdata->enable_rotary0)
279 report_rotary_event(keypad, 0, rotary_delta(kprec));
281 if (pdata->enable_rotary1)
282 report_rotary_event(keypad, 1, rotary_delta(kprec >> 16));
285 static void pxa27x_keypad_scan_direct(struct pxa27x_keypad *keypad)
287 struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
288 unsigned int new_state;
289 uint32_t kpdk, bits_changed;
292 kpdk = keypad_readl(KPDK);
294 if (pdata->enable_rotary0 || pdata->enable_rotary1)
295 pxa27x_keypad_scan_rotary(keypad);
297 if (pdata->direct_key_map == NULL)
300 new_state = KPDK_DK(kpdk) & keypad->direct_key_mask;
301 bits_changed = keypad->direct_key_state ^ new_state;
303 if (bits_changed == 0)
306 for (i = 0; i < pdata->direct_key_num; i++) {
307 if (bits_changed & (1 << i))
308 input_report_key(keypad->input_dev,
309 pdata->direct_key_map[i],
310 (new_state & (1 << i)));
312 input_sync(keypad->input_dev);
313 keypad->direct_key_state = new_state;
316 static irqreturn_t pxa27x_keypad_irq_handler(int irq, void *dev_id)
318 struct pxa27x_keypad *keypad = dev_id;
319 unsigned long kpc = keypad_readl(KPC);
322 pxa27x_keypad_scan_direct(keypad);
325 pxa27x_keypad_scan_matrix(keypad);
330 static void pxa27x_keypad_config(struct pxa27x_keypad *keypad)
332 struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
333 unsigned int mask = 0, direct_key_num = 0;
334 unsigned long kpc = 0;
336 /* enable matrix keys with automatic scan */
337 if (pdata->matrix_key_rows && pdata->matrix_key_cols) {
338 kpc |= KPC_ASACT | KPC_MIE | KPC_ME | KPC_MS_ALL;
339 kpc |= KPC_MKRN(pdata->matrix_key_rows) |
340 KPC_MKCN(pdata->matrix_key_cols);
343 /* enable rotary key, debounce interval same as direct keys */
344 if (pdata->enable_rotary0) {
350 if (pdata->enable_rotary1) {
356 if (pdata->direct_key_num > direct_key_num)
357 direct_key_num = pdata->direct_key_num;
359 keypad->direct_key_mask = ((2 << direct_key_num) - 1) & ~mask;
361 /* enable direct key */
363 kpc |= KPC_DE | KPC_DIE | KPC_DKN(direct_key_num);
365 keypad_writel(KPC, kpc | KPC_RE_ZERO_DEB);
366 keypad_writel(KPREC, DEFAULT_KPREC);
367 keypad_writel(KPKDI, pdata->debounce_interval);
370 static int pxa27x_keypad_open(struct input_dev *dev)
372 struct pxa27x_keypad *keypad = input_get_drvdata(dev);
374 /* Enable unit clock */
375 clk_enable(keypad->clk);
376 pxa27x_keypad_config(keypad);
381 static void pxa27x_keypad_close(struct input_dev *dev)
383 struct pxa27x_keypad *keypad = input_get_drvdata(dev);
385 /* Disable clock unit */
386 clk_disable(keypad->clk);
390 static int pxa27x_keypad_suspend(struct platform_device *pdev, pm_message_t state)
392 struct pxa27x_keypad *keypad = platform_get_drvdata(pdev);
394 clk_disable(keypad->clk);
398 static int pxa27x_keypad_resume(struct platform_device *pdev)
400 struct pxa27x_keypad *keypad = platform_get_drvdata(pdev);
401 struct input_dev *input_dev = keypad->input_dev;
403 mutex_lock(&input_dev->mutex);
405 if (input_dev->users) {
406 /* Enable unit clock */
407 clk_enable(keypad->clk);
408 pxa27x_keypad_config(keypad);
411 mutex_unlock(&input_dev->mutex);
416 #define pxa27x_keypad_suspend NULL
417 #define pxa27x_keypad_resume NULL
420 #define res_size(res) ((res)->end - (res)->start + 1)
422 static int __devinit pxa27x_keypad_probe(struct platform_device *pdev)
424 struct pxa27x_keypad *keypad;
425 struct input_dev *input_dev;
426 struct resource *res;
429 keypad = kzalloc(sizeof(struct pxa27x_keypad), GFP_KERNEL);
430 if (keypad == NULL) {
431 dev_err(&pdev->dev, "failed to allocate driver data\n");
435 keypad->pdata = pdev->dev.platform_data;
436 if (keypad->pdata == NULL) {
437 dev_err(&pdev->dev, "no platform data defined\n");
442 irq = platform_get_irq(pdev, 0);
444 dev_err(&pdev->dev, "failed to get keypad irq\n");
449 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
451 dev_err(&pdev->dev, "failed to get I/O memory\n");
456 res = request_mem_region(res->start, res_size(res), pdev->name);
458 dev_err(&pdev->dev, "failed to request I/O memory\n");
463 keypad->mmio_base = ioremap(res->start, res_size(res));
464 if (keypad->mmio_base == NULL) {
465 dev_err(&pdev->dev, "failed to remap I/O memory\n");
467 goto failed_free_mem;
470 keypad->clk = clk_get(&pdev->dev, "KBDCLK");
471 if (IS_ERR(keypad->clk)) {
472 dev_err(&pdev->dev, "failed to get keypad clock\n");
473 error = PTR_ERR(keypad->clk);
477 /* Create and register the input driver. */
478 input_dev = input_allocate_device();
480 dev_err(&pdev->dev, "failed to allocate input device\n");
485 input_dev->name = pdev->name;
486 input_dev->id.bustype = BUS_HOST;
487 input_dev->open = pxa27x_keypad_open;
488 input_dev->close = pxa27x_keypad_close;
489 input_dev->dev.parent = &pdev->dev;
491 keypad->input_dev = input_dev;
492 input_set_drvdata(input_dev, keypad);
494 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
495 if ((keypad->pdata->enable_rotary0 &&
496 keypad->pdata->rotary0_rel_code) ||
497 (keypad->pdata->enable_rotary1 &&
498 keypad->pdata->rotary1_rel_code)) {
499 input_dev->evbit[0] |= BIT_MASK(EV_REL);
502 pxa27x_keypad_build_keycode(keypad);
503 platform_set_drvdata(pdev, keypad);
505 error = request_irq(irq, pxa27x_keypad_irq_handler, IRQF_DISABLED,
508 dev_err(&pdev->dev, "failed to request IRQ\n");
509 goto failed_free_dev;
512 /* Register the input device */
513 error = input_register_device(input_dev);
515 dev_err(&pdev->dev, "failed to register input device\n");
516 goto failed_free_irq;
523 platform_set_drvdata(pdev, NULL);
525 input_free_device(input_dev);
527 clk_put(keypad->clk);
529 iounmap(keypad->mmio_base);
531 release_mem_region(res->start, res_size(res));
537 static int __devexit pxa27x_keypad_remove(struct platform_device *pdev)
539 struct pxa27x_keypad *keypad = platform_get_drvdata(pdev);
540 struct resource *res;
542 free_irq(platform_get_irq(pdev, 0), pdev);
544 clk_disable(keypad->clk);
545 clk_put(keypad->clk);
547 input_unregister_device(keypad->input_dev);
548 input_free_device(keypad->input_dev);
550 iounmap(keypad->mmio_base);
552 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
553 release_mem_region(res->start, res_size(res));
555 platform_set_drvdata(pdev, NULL);
560 /* work with hotplug and coldplug */
561 MODULE_ALIAS("platform:pxa27x-keypad");
563 static struct platform_driver pxa27x_keypad_driver = {
564 .probe = pxa27x_keypad_probe,
565 .remove = __devexit_p(pxa27x_keypad_remove),
566 .suspend = pxa27x_keypad_suspend,
567 .resume = pxa27x_keypad_resume,
569 .name = "pxa27x-keypad",
570 .owner = THIS_MODULE,
574 static int __init pxa27x_keypad_init(void)
576 return platform_driver_register(&pxa27x_keypad_driver);
579 static void __exit pxa27x_keypad_exit(void)
581 platform_driver_unregister(&pxa27x_keypad_driver);
584 module_init(pxa27x_keypad_init);
585 module_exit(pxa27x_keypad_exit);
587 MODULE_DESCRIPTION("PXA27x Keypad Controller Driver");
588 MODULE_LICENSE("GPL");