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;
110 /* matrix key code map */
111 unsigned int matrix_keycodes[MAX_MATRIX_KEY_NUM];
113 /* state row bits of each column scan */
114 uint32_t matrix_key_state[MAX_MATRIX_KEY_COLS];
115 uint32_t direct_key_state;
117 unsigned int direct_key_mask;
119 int rotary_rel_code[2];
120 int rotary_up_key[2];
121 int rotary_down_key[2];
124 static void pxa27x_keypad_build_keycode(struct pxa27x_keypad *keypad)
126 struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
127 struct input_dev *input_dev = keypad->input_dev;
131 key = &pdata->matrix_key_map[0];
132 for (i = 0; i < pdata->matrix_key_map_size; i++, key++) {
133 int row = ((*key) >> 28) & 0xf;
134 int col = ((*key) >> 24) & 0xf;
135 int code = (*key) & 0xffffff;
137 keypad->matrix_keycodes[(row << 3) + col] = code;
138 set_bit(code, input_dev->keybit);
141 keypad->rotary_up_key[0] = pdata->rotary0_up_key;
142 keypad->rotary_up_key[1] = pdata->rotary1_up_key;
143 keypad->rotary_down_key[0] = pdata->rotary0_down_key;
144 keypad->rotary_down_key[1] = pdata->rotary1_down_key;
145 keypad->rotary_rel_code[0] = pdata->rotary0_rel_code;
146 keypad->rotary_rel_code[1] = pdata->rotary1_rel_code;
148 if (pdata->rotary0_up_key && pdata->rotary0_down_key) {
149 set_bit(pdata->rotary0_up_key, input_dev->keybit);
150 set_bit(pdata->rotary0_down_key, input_dev->keybit);
152 set_bit(pdata->rotary0_rel_code, input_dev->relbit);
154 if (pdata->rotary1_up_key && pdata->rotary1_down_key) {
155 set_bit(pdata->rotary1_up_key, input_dev->keybit);
156 set_bit(pdata->rotary1_down_key, input_dev->keybit);
158 set_bit(pdata->rotary1_rel_code, input_dev->relbit);
161 static inline unsigned int lookup_matrix_keycode(
162 struct pxa27x_keypad *keypad, int row, int col)
164 return keypad->matrix_keycodes[(row << 3) + col];
167 static void pxa27x_keypad_scan_matrix(struct pxa27x_keypad *keypad)
169 struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
170 int row, col, num_keys_pressed = 0;
171 uint32_t new_state[MAX_MATRIX_KEY_COLS];
172 uint32_t kpas = keypad_readl(KPAS);
174 num_keys_pressed = KPAS_MUKP(kpas);
176 memset(new_state, 0, sizeof(new_state));
178 if (num_keys_pressed == 0)
181 if (num_keys_pressed == 1) {
185 /* if invalid row/col, treat as no key pressed */
186 if (col >= pdata->matrix_key_cols ||
187 row >= pdata->matrix_key_rows)
190 new_state[col] = (1 << row);
194 if (num_keys_pressed > 1) {
195 uint32_t kpasmkp0 = keypad_readl(KPASMKP0);
196 uint32_t kpasmkp1 = keypad_readl(KPASMKP1);
197 uint32_t kpasmkp2 = keypad_readl(KPASMKP2);
198 uint32_t kpasmkp3 = keypad_readl(KPASMKP3);
200 new_state[0] = kpasmkp0 & KPASMKP_MKC_MASK;
201 new_state[1] = (kpasmkp0 >> 16) & KPASMKP_MKC_MASK;
202 new_state[2] = kpasmkp1 & KPASMKP_MKC_MASK;
203 new_state[3] = (kpasmkp1 >> 16) & KPASMKP_MKC_MASK;
204 new_state[4] = kpasmkp2 & KPASMKP_MKC_MASK;
205 new_state[5] = (kpasmkp2 >> 16) & KPASMKP_MKC_MASK;
206 new_state[6] = kpasmkp3 & KPASMKP_MKC_MASK;
207 new_state[7] = (kpasmkp3 >> 16) & KPASMKP_MKC_MASK;
210 for (col = 0; col < pdata->matrix_key_cols; col++) {
211 uint32_t bits_changed;
213 bits_changed = keypad->matrix_key_state[col] ^ new_state[col];
214 if (bits_changed == 0)
217 for (row = 0; row < pdata->matrix_key_rows; row++) {
218 if ((bits_changed & (1 << row)) == 0)
221 input_report_key(keypad->input_dev,
222 lookup_matrix_keycode(keypad, row, col),
223 new_state[col] & (1 << row));
226 input_sync(keypad->input_dev);
227 memcpy(keypad->matrix_key_state, new_state, sizeof(new_state));
230 #define DEFAULT_KPREC (0x007f007f)
232 static inline int rotary_delta(uint32_t kprec)
234 if (kprec & KPREC_OF0)
235 return (kprec & 0xff) + 0x7f;
236 else if (kprec & KPREC_UF0)
237 return (kprec & 0xff) - 0x7f - 0xff;
239 return (kprec & 0xff) - 0x7f;
242 static void report_rotary_event(struct pxa27x_keypad *keypad, int r, int delta)
244 struct input_dev *dev = keypad->input_dev;
249 if (keypad->rotary_up_key[r] && keypad->rotary_down_key[r]) {
250 int keycode = (delta > 0) ? keypad->rotary_up_key[r] :
251 keypad->rotary_down_key[r];
253 /* simulate a press-n-release */
254 input_report_key(dev, keycode, 1);
256 input_report_key(dev, keycode, 0);
259 input_report_rel(dev, keypad->rotary_rel_code[r], delta);
264 static void pxa27x_keypad_scan_rotary(struct pxa27x_keypad *keypad)
266 struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
269 /* read and reset to default count value */
270 kprec = keypad_readl(KPREC);
271 keypad_writel(KPREC, DEFAULT_KPREC);
273 if (pdata->enable_rotary0)
274 report_rotary_event(keypad, 0, rotary_delta(kprec));
276 if (pdata->enable_rotary1)
277 report_rotary_event(keypad, 1, rotary_delta(kprec >> 16));
280 static void pxa27x_keypad_scan_direct(struct pxa27x_keypad *keypad)
282 struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
283 unsigned int new_state;
284 uint32_t kpdk, bits_changed;
287 kpdk = keypad_readl(KPDK);
289 if (pdata->enable_rotary0 || pdata->enable_rotary1)
290 pxa27x_keypad_scan_rotary(keypad);
292 if (pdata->direct_key_map == NULL)
295 new_state = KPDK_DK(kpdk) & keypad->direct_key_mask;
296 bits_changed = keypad->direct_key_state ^ new_state;
298 if (bits_changed == 0)
301 for (i = 0; i < pdata->direct_key_num; i++) {
302 if (bits_changed & (1 << i))
303 input_report_key(keypad->input_dev,
304 pdata->direct_key_map[i],
305 (new_state & (1 << i)));
307 input_sync(keypad->input_dev);
308 keypad->direct_key_state = new_state;
311 static irqreturn_t pxa27x_keypad_irq_handler(int irq, void *dev_id)
313 struct pxa27x_keypad *keypad = dev_id;
314 unsigned long kpc = keypad_readl(KPC);
317 pxa27x_keypad_scan_direct(keypad);
320 pxa27x_keypad_scan_matrix(keypad);
325 static void pxa27x_keypad_config(struct pxa27x_keypad *keypad)
327 struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
328 unsigned int mask = 0, direct_key_num = 0;
329 unsigned long kpc = 0;
331 /* enable matrix keys with automatic scan */
332 if (pdata->matrix_key_rows && pdata->matrix_key_cols) {
333 kpc |= KPC_ASACT | KPC_MIE | KPC_ME | KPC_MS_ALL;
334 kpc |= KPC_MKRN(pdata->matrix_key_rows) |
335 KPC_MKCN(pdata->matrix_key_cols);
338 /* enable rotary key, debounce interval same as direct keys */
339 if (pdata->enable_rotary0) {
345 if (pdata->enable_rotary1) {
351 if (pdata->direct_key_num > direct_key_num)
352 direct_key_num = pdata->direct_key_num;
354 keypad->direct_key_mask = ((2 << direct_key_num) - 1) & ~mask;
356 /* enable direct key */
358 kpc |= KPC_DE | KPC_DIE | KPC_DKN(direct_key_num);
360 keypad_writel(KPC, kpc | KPC_RE_ZERO_DEB);
361 keypad_writel(KPREC, DEFAULT_KPREC);
362 keypad_writel(KPKDI, pdata->debounce_interval);
365 static int pxa27x_keypad_open(struct input_dev *dev)
367 struct pxa27x_keypad *keypad = input_get_drvdata(dev);
369 /* Enable unit clock */
370 clk_enable(keypad->clk);
371 pxa27x_keypad_config(keypad);
376 static void pxa27x_keypad_close(struct input_dev *dev)
378 struct pxa27x_keypad *keypad = input_get_drvdata(dev);
380 /* Disable clock unit */
381 clk_disable(keypad->clk);
385 static int pxa27x_keypad_suspend(struct platform_device *pdev, pm_message_t state)
387 struct pxa27x_keypad *keypad = platform_get_drvdata(pdev);
389 clk_disable(keypad->clk);
391 if (device_may_wakeup(&pdev->dev))
392 enable_irq_wake(keypad->irq);
397 static int pxa27x_keypad_resume(struct platform_device *pdev)
399 struct pxa27x_keypad *keypad = platform_get_drvdata(pdev);
400 struct input_dev *input_dev = keypad->input_dev;
402 if (device_may_wakeup(&pdev->dev))
403 disable_irq_wake(keypad->irq);
405 mutex_lock(&input_dev->mutex);
407 if (input_dev->users) {
408 /* Enable unit clock */
409 clk_enable(keypad->clk);
410 pxa27x_keypad_config(keypad);
413 mutex_unlock(&input_dev->mutex);
418 #define pxa27x_keypad_suspend NULL
419 #define pxa27x_keypad_resume NULL
422 #define res_size(res) ((res)->end - (res)->start + 1)
424 static int __devinit pxa27x_keypad_probe(struct platform_device *pdev)
426 struct pxa27x_keypad *keypad;
427 struct input_dev *input_dev;
428 struct resource *res;
431 keypad = kzalloc(sizeof(struct pxa27x_keypad), GFP_KERNEL);
432 if (keypad == NULL) {
433 dev_err(&pdev->dev, "failed to allocate driver data\n");
437 keypad->pdata = pdev->dev.platform_data;
438 if (keypad->pdata == NULL) {
439 dev_err(&pdev->dev, "no platform data defined\n");
444 irq = platform_get_irq(pdev, 0);
446 dev_err(&pdev->dev, "failed to get keypad irq\n");
451 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
453 dev_err(&pdev->dev, "failed to get I/O memory\n");
458 res = request_mem_region(res->start, res_size(res), pdev->name);
460 dev_err(&pdev->dev, "failed to request I/O memory\n");
465 keypad->mmio_base = ioremap(res->start, res_size(res));
466 if (keypad->mmio_base == NULL) {
467 dev_err(&pdev->dev, "failed to remap I/O memory\n");
469 goto failed_free_mem;
472 keypad->clk = clk_get(&pdev->dev, "KBDCLK");
473 if (IS_ERR(keypad->clk)) {
474 dev_err(&pdev->dev, "failed to get keypad clock\n");
475 error = PTR_ERR(keypad->clk);
479 /* Create and register the input driver. */
480 input_dev = input_allocate_device();
482 dev_err(&pdev->dev, "failed to allocate input device\n");
487 input_dev->name = pdev->name;
488 input_dev->id.bustype = BUS_HOST;
489 input_dev->open = pxa27x_keypad_open;
490 input_dev->close = pxa27x_keypad_close;
491 input_dev->dev.parent = &pdev->dev;
493 keypad->input_dev = input_dev;
494 input_set_drvdata(input_dev, keypad);
496 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP) |
499 pxa27x_keypad_build_keycode(keypad);
500 platform_set_drvdata(pdev, keypad);
502 error = request_irq(irq, pxa27x_keypad_irq_handler, IRQF_DISABLED,
505 dev_err(&pdev->dev, "failed to request IRQ\n");
506 goto failed_free_dev;
511 /* Register the input device */
512 error = input_register_device(input_dev);
514 dev_err(&pdev->dev, "failed to register input device\n");
515 goto failed_free_irq;
518 device_init_wakeup(&pdev->dev, 1);
524 platform_set_drvdata(pdev, NULL);
526 input_free_device(input_dev);
528 clk_put(keypad->clk);
530 iounmap(keypad->mmio_base);
532 release_mem_region(res->start, res_size(res));
538 static int __devexit pxa27x_keypad_remove(struct platform_device *pdev)
540 struct pxa27x_keypad *keypad = platform_get_drvdata(pdev);
541 struct resource *res;
543 free_irq(keypad->irq, pdev);
545 clk_disable(keypad->clk);
546 clk_put(keypad->clk);
548 input_unregister_device(keypad->input_dev);
549 input_free_device(keypad->input_dev);
551 iounmap(keypad->mmio_base);
553 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
554 release_mem_region(res->start, res_size(res));
556 platform_set_drvdata(pdev, NULL);
561 /* work with hotplug and coldplug */
562 MODULE_ALIAS("platform:pxa27x-keypad");
564 static struct platform_driver pxa27x_keypad_driver = {
565 .probe = pxa27x_keypad_probe,
566 .remove = __devexit_p(pxa27x_keypad_remove),
567 .suspend = pxa27x_keypad_suspend,
568 .resume = pxa27x_keypad_resume,
570 .name = "pxa27x-keypad",
571 .owner = THIS_MODULE,
575 static int __init pxa27x_keypad_init(void)
577 return platform_driver_register(&pxa27x_keypad_driver);
580 static void __exit pxa27x_keypad_exit(void)
582 platform_driver_unregister(&pxa27x_keypad_driver);
585 module_init(pxa27x_keypad_init);
586 module_exit(pxa27x_keypad_exit);
588 MODULE_DESCRIPTION("PXA27x Keypad Controller Driver");
589 MODULE_LICENSE("GPL");