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 keypad->rotary_up_key[0] = pdata->rotary0_up_key;
140 keypad->rotary_up_key[1] = pdata->rotary1_up_key;
141 keypad->rotary_down_key[0] = pdata->rotary0_down_key;
142 keypad->rotary_down_key[1] = pdata->rotary1_down_key;
143 keypad->rotary_rel_code[0] = pdata->rotary0_rel_code;
144 keypad->rotary_rel_code[1] = pdata->rotary1_rel_code;
146 if (pdata->rotary0_up_key && pdata->rotary0_down_key) {
147 set_bit(pdata->rotary0_up_key, input_dev->keybit);
148 set_bit(pdata->rotary0_down_key, input_dev->keybit);
150 set_bit(pdata->rotary0_rel_code, input_dev->relbit);
152 if (pdata->rotary1_up_key && pdata->rotary1_down_key) {
153 set_bit(pdata->rotary1_up_key, input_dev->keybit);
154 set_bit(pdata->rotary1_down_key, input_dev->keybit);
156 set_bit(pdata->rotary1_rel_code, input_dev->relbit);
159 static inline unsigned int lookup_matrix_keycode(
160 struct pxa27x_keypad *keypad, int row, int col)
162 return keypad->matrix_keycodes[(row << 3) + col];
165 static void pxa27x_keypad_scan_matrix(struct pxa27x_keypad *keypad)
167 struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
168 int row, col, num_keys_pressed = 0;
169 uint32_t new_state[MAX_MATRIX_KEY_COLS];
170 uint32_t kpas = keypad_readl(KPAS);
172 num_keys_pressed = KPAS_MUKP(kpas);
174 memset(new_state, 0, sizeof(new_state));
176 if (num_keys_pressed == 0)
179 if (num_keys_pressed == 1) {
183 /* if invalid row/col, treat as no key pressed */
184 if (col >= pdata->matrix_key_cols ||
185 row >= pdata->matrix_key_rows)
188 new_state[col] = (1 << row);
192 if (num_keys_pressed > 1) {
193 uint32_t kpasmkp0 = keypad_readl(KPASMKP0);
194 uint32_t kpasmkp1 = keypad_readl(KPASMKP1);
195 uint32_t kpasmkp2 = keypad_readl(KPASMKP2);
196 uint32_t kpasmkp3 = keypad_readl(KPASMKP3);
198 new_state[0] = kpasmkp0 & KPASMKP_MKC_MASK;
199 new_state[1] = (kpasmkp0 >> 16) & KPASMKP_MKC_MASK;
200 new_state[2] = kpasmkp1 & KPASMKP_MKC_MASK;
201 new_state[3] = (kpasmkp1 >> 16) & KPASMKP_MKC_MASK;
202 new_state[4] = kpasmkp2 & KPASMKP_MKC_MASK;
203 new_state[5] = (kpasmkp2 >> 16) & KPASMKP_MKC_MASK;
204 new_state[6] = kpasmkp3 & KPASMKP_MKC_MASK;
205 new_state[7] = (kpasmkp3 >> 16) & KPASMKP_MKC_MASK;
208 for (col = 0; col < pdata->matrix_key_cols; col++) {
209 uint32_t bits_changed;
211 bits_changed = keypad->matrix_key_state[col] ^ new_state[col];
212 if (bits_changed == 0)
215 for (row = 0; row < pdata->matrix_key_rows; row++) {
216 if ((bits_changed & (1 << row)) == 0)
219 input_report_key(keypad->input_dev,
220 lookup_matrix_keycode(keypad, row, col),
221 new_state[col] & (1 << row));
224 input_sync(keypad->input_dev);
225 memcpy(keypad->matrix_key_state, new_state, sizeof(new_state));
228 #define DEFAULT_KPREC (0x007f007f)
230 static inline int rotary_delta(uint32_t kprec)
232 if (kprec & KPREC_OF0)
233 return (kprec & 0xff) + 0x7f;
234 else if (kprec & KPREC_UF0)
235 return (kprec & 0xff) - 0x7f - 0xff;
237 return (kprec & 0xff) - 0x7f;
240 static void report_rotary_event(struct pxa27x_keypad *keypad, int r, int delta)
242 struct input_dev *dev = keypad->input_dev;
247 if (keypad->rotary_up_key[r] && keypad->rotary_down_key[r]) {
248 int keycode = (delta > 0) ? keypad->rotary_up_key[r] :
249 keypad->rotary_down_key[r];
251 /* simulate a press-n-release */
252 input_report_key(dev, keycode, 1);
254 input_report_key(dev, keycode, 0);
257 input_report_rel(dev, keypad->rotary_rel_code[r], delta);
262 static void pxa27x_keypad_scan_rotary(struct pxa27x_keypad *keypad)
264 struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
267 /* read and reset to default count value */
268 kprec = keypad_readl(KPREC);
269 keypad_writel(KPREC, DEFAULT_KPREC);
271 if (pdata->enable_rotary0)
272 report_rotary_event(keypad, 0, rotary_delta(kprec));
274 if (pdata->enable_rotary1)
275 report_rotary_event(keypad, 1, rotary_delta(kprec >> 16));
278 static void pxa27x_keypad_scan_direct(struct pxa27x_keypad *keypad)
280 struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
281 unsigned int new_state;
282 uint32_t kpdk, bits_changed;
285 kpdk = keypad_readl(KPDK);
287 if (pdata->enable_rotary0 || pdata->enable_rotary1)
288 pxa27x_keypad_scan_rotary(keypad);
290 if (pdata->direct_key_map == NULL)
293 new_state = KPDK_DK(kpdk) & keypad->direct_key_mask;
294 bits_changed = keypad->direct_key_state ^ new_state;
296 if (bits_changed == 0)
299 for (i = 0; i < pdata->direct_key_num; i++) {
300 if (bits_changed & (1 << i))
301 input_report_key(keypad->input_dev,
302 pdata->direct_key_map[i],
303 (new_state & (1 << i)));
305 input_sync(keypad->input_dev);
306 keypad->direct_key_state = new_state;
309 static irqreturn_t pxa27x_keypad_irq_handler(int irq, void *dev_id)
311 struct pxa27x_keypad *keypad = dev_id;
312 unsigned long kpc = keypad_readl(KPC);
315 pxa27x_keypad_scan_direct(keypad);
318 pxa27x_keypad_scan_matrix(keypad);
323 static void pxa27x_keypad_config(struct pxa27x_keypad *keypad)
325 struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
326 unsigned int mask = 0, direct_key_num = 0;
327 unsigned long kpc = 0;
329 /* enable matrix keys with automatic scan */
330 if (pdata->matrix_key_rows && pdata->matrix_key_cols) {
331 kpc |= KPC_ASACT | KPC_MIE | KPC_ME | KPC_MS_ALL;
332 kpc |= KPC_MKRN(pdata->matrix_key_rows) |
333 KPC_MKCN(pdata->matrix_key_cols);
336 /* enable rotary key, debounce interval same as direct keys */
337 if (pdata->enable_rotary0) {
343 if (pdata->enable_rotary1) {
349 if (pdata->direct_key_num > direct_key_num)
350 direct_key_num = pdata->direct_key_num;
352 keypad->direct_key_mask = ((2 << direct_key_num) - 1) & ~mask;
354 /* enable direct key */
356 kpc |= KPC_DE | KPC_DIE | KPC_DKN(direct_key_num);
358 keypad_writel(KPC, kpc | KPC_RE_ZERO_DEB);
359 keypad_writel(KPREC, DEFAULT_KPREC);
360 keypad_writel(KPKDI, pdata->debounce_interval);
363 static int pxa27x_keypad_open(struct input_dev *dev)
365 struct pxa27x_keypad *keypad = input_get_drvdata(dev);
367 /* Enable unit clock */
368 clk_enable(keypad->clk);
369 pxa27x_keypad_config(keypad);
374 static void pxa27x_keypad_close(struct input_dev *dev)
376 struct pxa27x_keypad *keypad = input_get_drvdata(dev);
378 /* Disable clock unit */
379 clk_disable(keypad->clk);
383 static int pxa27x_keypad_suspend(struct platform_device *pdev, pm_message_t state)
385 struct pxa27x_keypad *keypad = platform_get_drvdata(pdev);
387 clk_disable(keypad->clk);
391 static int pxa27x_keypad_resume(struct platform_device *pdev)
393 struct pxa27x_keypad *keypad = platform_get_drvdata(pdev);
394 struct input_dev *input_dev = keypad->input_dev;
396 mutex_lock(&input_dev->mutex);
398 if (input_dev->users) {
399 /* Enable unit clock */
400 clk_enable(keypad->clk);
401 pxa27x_keypad_config(keypad);
404 mutex_unlock(&input_dev->mutex);
409 #define pxa27x_keypad_suspend NULL
410 #define pxa27x_keypad_resume NULL
413 #define res_size(res) ((res)->end - (res)->start + 1)
415 static int __devinit pxa27x_keypad_probe(struct platform_device *pdev)
417 struct pxa27x_keypad *keypad;
418 struct input_dev *input_dev;
419 struct resource *res;
422 keypad = kzalloc(sizeof(struct pxa27x_keypad), GFP_KERNEL);
423 if (keypad == NULL) {
424 dev_err(&pdev->dev, "failed to allocate driver data\n");
428 keypad->pdata = pdev->dev.platform_data;
429 if (keypad->pdata == NULL) {
430 dev_err(&pdev->dev, "no platform data defined\n");
435 irq = platform_get_irq(pdev, 0);
437 dev_err(&pdev->dev, "failed to get keypad irq\n");
442 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
444 dev_err(&pdev->dev, "failed to get I/O memory\n");
449 res = request_mem_region(res->start, res_size(res), pdev->name);
451 dev_err(&pdev->dev, "failed to request I/O memory\n");
456 keypad->mmio_base = ioremap(res->start, res_size(res));
457 if (keypad->mmio_base == NULL) {
458 dev_err(&pdev->dev, "failed to remap I/O memory\n");
460 goto failed_free_mem;
463 keypad->clk = clk_get(&pdev->dev, "KBDCLK");
464 if (IS_ERR(keypad->clk)) {
465 dev_err(&pdev->dev, "failed to get keypad clock\n");
466 error = PTR_ERR(keypad->clk);
470 /* Create and register the input driver. */
471 input_dev = input_allocate_device();
473 dev_err(&pdev->dev, "failed to allocate input device\n");
478 input_dev->name = pdev->name;
479 input_dev->id.bustype = BUS_HOST;
480 input_dev->open = pxa27x_keypad_open;
481 input_dev->close = pxa27x_keypad_close;
482 input_dev->dev.parent = &pdev->dev;
484 keypad->input_dev = input_dev;
485 input_set_drvdata(input_dev, keypad);
487 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP) |
490 pxa27x_keypad_build_keycode(keypad);
491 platform_set_drvdata(pdev, keypad);
493 error = request_irq(irq, pxa27x_keypad_irq_handler, IRQF_DISABLED,
496 dev_err(&pdev->dev, "failed to request IRQ\n");
497 goto failed_free_dev;
500 /* Register the input device */
501 error = input_register_device(input_dev);
503 dev_err(&pdev->dev, "failed to register input device\n");
504 goto failed_free_irq;
511 platform_set_drvdata(pdev, NULL);
513 input_free_device(input_dev);
515 clk_put(keypad->clk);
517 iounmap(keypad->mmio_base);
519 release_mem_region(res->start, res_size(res));
525 static int __devexit pxa27x_keypad_remove(struct platform_device *pdev)
527 struct pxa27x_keypad *keypad = platform_get_drvdata(pdev);
528 struct resource *res;
530 free_irq(platform_get_irq(pdev, 0), pdev);
532 clk_disable(keypad->clk);
533 clk_put(keypad->clk);
535 input_unregister_device(keypad->input_dev);
536 input_free_device(keypad->input_dev);
538 iounmap(keypad->mmio_base);
540 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
541 release_mem_region(res->start, res_size(res));
543 platform_set_drvdata(pdev, NULL);
548 /* work with hotplug and coldplug */
549 MODULE_ALIAS("platform:pxa27x-keypad");
551 static struct platform_driver pxa27x_keypad_driver = {
552 .probe = pxa27x_keypad_probe,
553 .remove = __devexit_p(pxa27x_keypad_remove),
554 .suspend = pxa27x_keypad_suspend,
555 .resume = pxa27x_keypad_resume,
557 .name = "pxa27x-keypad",
558 .owner = THIS_MODULE,
562 static int __init pxa27x_keypad_init(void)
564 return platform_driver_register(&pxa27x_keypad_driver);
567 static void __exit pxa27x_keypad_exit(void)
569 platform_driver_unregister(&pxa27x_keypad_driver);
572 module_init(pxa27x_keypad_init);
573 module_exit(pxa27x_keypad_exit);
575 MODULE_DESCRIPTION("PXA27x Keypad Controller Driver");
576 MODULE_LICENSE("GPL");