1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * linux/drivers/input/keyboard/pxa27x_keypad.c
  4 *
  5 * Driver for the pxa27x matrix keyboard controller.
  6 *
  7 * Created:	Feb 22, 2007
  8 * Author:	Rodolfo Giometti <giometti@linux.it>
  9 *
 10 * Based on a previous implementations by Kevin O'Connor
 11 * <kevin_at_koconnor.net> and Alex Osborne <bobofdoom@gmail.com> and
 12 * on some suggestions by Nicolas Pitre <nico@fluxnic.net>.
 
 
 
 
 13 */
 14
 15
 16#include <linux/kernel.h>
 17#include <linux/module.h>
 
 18#include <linux/interrupt.h>
 19#include <linux/input.h>
 20#include <linux/io.h>
 21#include <linux/device.h>
 22#include <linux/platform_device.h>
 23#include <linux/clk.h>
 24#include <linux/err.h>
 25#include <linux/input/matrix_keypad.h>
 26#include <linux/slab.h>
 27#include <linux/of.h>
 28
 29#include <linux/platform_data/keypad-pxa27x.h>
 
 
 
 
 30/*
 31 * Keypad Controller registers
 32 */
 33#define KPC             0x0000 /* Keypad Control register */
 34#define KPDK            0x0008 /* Keypad Direct Key register */
 35#define KPREC           0x0010 /* Keypad Rotary Encoder register */
 36#define KPMK            0x0018 /* Keypad Matrix Key register */
 37#define KPAS            0x0020 /* Keypad Automatic Scan register */
 38
 39/* Keypad Automatic Scan Multiple Key Presser register 0-3 */
 40#define KPASMKP0        0x0028
 41#define KPASMKP1        0x0030
 42#define KPASMKP2        0x0038
 43#define KPASMKP3        0x0040
 44#define KPKDI           0x0048
 45
 46/* bit definitions */
 47#define KPC_MKRN(n)	((((n) - 1) & 0x7) << 26) /* matrix key row number */
 48#define KPC_MKCN(n)	((((n) - 1) & 0x7) << 23) /* matrix key column number */
 49#define KPC_DKN(n)	((((n) - 1) & 0x7) << 6)  /* direct key number */
 50
 51#define KPC_AS          (0x1 << 30)  /* Automatic Scan bit */
 52#define KPC_ASACT       (0x1 << 29)  /* Automatic Scan on Activity */
 53#define KPC_MI          (0x1 << 22)  /* Matrix interrupt bit */
 54#define KPC_IMKP        (0x1 << 21)  /* Ignore Multiple Key Press */
 55
 56#define KPC_MS(n)	(0x1 << (13 + (n)))	/* Matrix scan line 'n' */
 57#define KPC_MS_ALL      (0xff << 13)
 58
 59#define KPC_ME          (0x1 << 12)  /* Matrix Keypad Enable */
 60#define KPC_MIE         (0x1 << 11)  /* Matrix Interrupt Enable */
 61#define KPC_DK_DEB_SEL	(0x1 <<  9)  /* Direct Keypad Debounce Select */
 62#define KPC_DI          (0x1 <<  5)  /* Direct key interrupt bit */
 63#define KPC_RE_ZERO_DEB (0x1 <<  4)  /* Rotary Encoder Zero Debounce */
 64#define KPC_REE1        (0x1 <<  3)  /* Rotary Encoder1 Enable */
 65#define KPC_REE0        (0x1 <<  2)  /* Rotary Encoder0 Enable */
 66#define KPC_DE          (0x1 <<  1)  /* Direct Keypad Enable */
 67#define KPC_DIE         (0x1 <<  0)  /* Direct Keypad interrupt Enable */
 68
 69#define KPDK_DKP        (0x1 << 31)
 70#define KPDK_DK(n)	((n) & 0xff)
 71
 72#define KPREC_OF1       (0x1 << 31)
 73#define kPREC_UF1       (0x1 << 30)
 74#define KPREC_OF0       (0x1 << 15)
 75#define KPREC_UF0       (0x1 << 14)
 76
 77#define KPREC_RECOUNT0(n)	((n) & 0xff)
 78#define KPREC_RECOUNT1(n)	(((n) >> 16) & 0xff)
 79
 80#define KPMK_MKP        (0x1 << 31)
 81#define KPAS_SO         (0x1 << 31)
 82#define KPASMKPx_SO     (0x1 << 31)
 83
 84#define KPAS_MUKP(n)	(((n) >> 26) & 0x1f)
 85#define KPAS_RP(n)	(((n) >> 4) & 0xf)
 86#define KPAS_CP(n)	((n) & 0xf)
 87
 88#define KPASMKP_MKC_MASK	(0xff)
 89
 90#define keypad_readl(off)	__raw_readl(keypad->mmio_base + (off))
 91#define keypad_writel(off, v)	__raw_writel((v), keypad->mmio_base + (off))
 92
 93#define MAX_MATRIX_KEY_NUM	(MAX_MATRIX_KEY_ROWS * MAX_MATRIX_KEY_COLS)
 94#define MAX_KEYPAD_KEYS		(MAX_MATRIX_KEY_NUM + MAX_DIRECT_KEY_NUM)
 95
 96struct pxa27x_keypad {
 97	const struct pxa27x_keypad_platform_data *pdata;
 98
 99	struct clk *clk;
100	struct input_dev *input_dev;
101	void __iomem *mmio_base;
102
103	int irq;
104
105	unsigned short keycodes[MAX_KEYPAD_KEYS];
106	int rotary_rel_code[2];
107
108	unsigned int row_shift;
109
110	/* state row bits of each column scan */
111	uint32_t matrix_key_state[MAX_MATRIX_KEY_COLS];
112	uint32_t direct_key_state;
113
114	unsigned int direct_key_mask;
115};
116
117#ifdef CONFIG_OF
118static int pxa27x_keypad_matrix_key_parse_dt(struct pxa27x_keypad *keypad,
119				struct pxa27x_keypad_platform_data *pdata)
120{
121	struct input_dev *input_dev = keypad->input_dev;
122	struct device *dev = input_dev->dev.parent;
123	u32 rows, cols;
124	int error;
125
126	error = matrix_keypad_parse_properties(dev, &rows, &cols);
127	if (error)
128		return error;
129
130	if (rows > MAX_MATRIX_KEY_ROWS || cols > MAX_MATRIX_KEY_COLS) {
131		dev_err(dev, "rows or cols exceeds maximum value\n");
132		return -EINVAL;
133	}
134
135	pdata->matrix_key_rows = rows;
136	pdata->matrix_key_cols = cols;
137
138	error = matrix_keypad_build_keymap(NULL, NULL,
139					   pdata->matrix_key_rows,
140					   pdata->matrix_key_cols,
141					   keypad->keycodes, input_dev);
142	if (error)
143		return error;
144
145	return 0;
146}
147
148static int pxa27x_keypad_direct_key_parse_dt(struct pxa27x_keypad *keypad,
149				struct pxa27x_keypad_platform_data *pdata)
150{
151	struct input_dev *input_dev = keypad->input_dev;
152	struct device *dev = input_dev->dev.parent;
153	struct device_node *np = dev->of_node;
154	const __be16 *prop;
155	unsigned short code;
156	unsigned int proplen, size;
157	int i;
158	int error;
159
160	error = of_property_read_u32(np, "marvell,direct-key-count",
161				     &pdata->direct_key_num);
162	if (error) {
163		/*
164		 * If do not have marvel,direct-key-count defined,
165		 * it means direct key is not supported.
166		 */
167		return error == -EINVAL ? 0 : error;
168	}
169
170	error = of_property_read_u32(np, "marvell,direct-key-mask",
171				     &pdata->direct_key_mask);
172	if (error) {
173		if (error != -EINVAL)
174			return error;
175
176		/*
177		 * If marvell,direct-key-mask is not defined, driver will use
178		 * default value. Default value is set when configure the keypad.
179		 */
180		pdata->direct_key_mask = 0;
181	}
182
183	pdata->direct_key_low_active = of_property_read_bool(np,
184					"marvell,direct-key-low-active");
185
186	prop = of_get_property(np, "marvell,direct-key-map", &proplen);
187	if (!prop)
188		return -EINVAL;
189
190	if (proplen % sizeof(u16))
191		return -EINVAL;
192
193	size = proplen / sizeof(u16);
194
195	/* Only MAX_DIRECT_KEY_NUM is accepted.*/
196	if (size > MAX_DIRECT_KEY_NUM)
197		return -EINVAL;
198
199	for (i = 0; i < size; i++) {
200		code = be16_to_cpup(prop + i);
201		keypad->keycodes[MAX_MATRIX_KEY_NUM + i] = code;
202		__set_bit(code, input_dev->keybit);
203	}
204
205	return 0;
206}
207
208static int pxa27x_keypad_rotary_parse_dt(struct pxa27x_keypad *keypad,
209				struct pxa27x_keypad_platform_data *pdata)
210{
211	const __be32 *prop;
212	int i, relkey_ret;
213	unsigned int code, proplen;
214	const char *rotaryname[2] = {
215			"marvell,rotary0", "marvell,rotary1"};
216	const char relkeyname[] = {"marvell,rotary-rel-key"};
217	struct input_dev *input_dev = keypad->input_dev;
218	struct device *dev = input_dev->dev.parent;
219	struct device_node *np = dev->of_node;
220
221	relkey_ret = of_property_read_u32(np, relkeyname, &code);
222	/* if can read correct rotary key-code, we do not need this. */
223	if (relkey_ret == 0) {
224		unsigned short relcode;
225
226		/* rotary0 taks lower half, rotary1 taks upper half. */
227		relcode = code & 0xffff;
228		pdata->rotary0_rel_code = (code & 0xffff);
229		__set_bit(relcode, input_dev->relbit);
230
231		relcode = code >> 16;
232		pdata->rotary1_rel_code = relcode;
233		__set_bit(relcode, input_dev->relbit);
234	}
235
236	for (i = 0; i < 2; i++) {
237		prop = of_get_property(np, rotaryname[i], &proplen);
238		/*
239		 * If the prop is not set, it means keypad does not need
240		 * initialize the rotaryX.
241		 */
242		if (!prop)
243			continue;
244
245		code = be32_to_cpup(prop);
246		/*
247		 * Not all up/down key code are valid.
248		 * Now we depends on direct-rel-code.
249		 */
250		if ((!(code & 0xffff) || !(code >> 16)) && relkey_ret) {
251			return relkey_ret;
252		} else {
253			unsigned int n = MAX_MATRIX_KEY_NUM + (i << 1);
254			unsigned short keycode;
255
256			keycode = code & 0xffff;
257			keypad->keycodes[n] = keycode;
258			__set_bit(keycode, input_dev->keybit);
259
260			keycode = code >> 16;
261			keypad->keycodes[n + 1] = keycode;
262			__set_bit(keycode, input_dev->keybit);
263
264			if (i == 0)
265				pdata->rotary0_rel_code = -1;
266			else
267				pdata->rotary1_rel_code = -1;
268		}
269		if (i == 0)
270			pdata->enable_rotary0 = 1;
271		else
272			pdata->enable_rotary1 = 1;
273	}
274
275	keypad->rotary_rel_code[0] = pdata->rotary0_rel_code;
276	keypad->rotary_rel_code[1] = pdata->rotary1_rel_code;
277
278	return 0;
279}
280
281static int pxa27x_keypad_build_keycode_from_dt(struct pxa27x_keypad *keypad)
282{
283	struct input_dev *input_dev = keypad->input_dev;
284	struct device *dev = input_dev->dev.parent;
285	struct device_node *np = dev->of_node;
286	struct pxa27x_keypad_platform_data *pdata;
287	int error;
288
289	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
290	if (!pdata) {
291		dev_err(dev, "failed to allocate memory for pdata\n");
292		return -ENOMEM;
293	}
294
295	error = pxa27x_keypad_matrix_key_parse_dt(keypad, pdata);
296	if (error) {
297		dev_err(dev, "failed to parse matrix key\n");
298		return error;
299	}
300
301	error = pxa27x_keypad_direct_key_parse_dt(keypad, pdata);
302	if (error) {
303		dev_err(dev, "failed to parse direct key\n");
304		return error;
305	}
306
307	error = pxa27x_keypad_rotary_parse_dt(keypad, pdata);
308	if (error) {
309		dev_err(dev, "failed to parse rotary key\n");
310		return error;
311	}
312
313	error = of_property_read_u32(np, "marvell,debounce-interval",
314				     &pdata->debounce_interval);
315	if (error) {
316		dev_err(dev, "failed to parse debounce-interval\n");
317		return error;
318	}
319
320	/*
321	 * The keycodes may not only includes matrix key but also the direct
322	 * key or rotary key.
323	 */
324	input_dev->keycodemax = ARRAY_SIZE(keypad->keycodes);
325
326	keypad->pdata = pdata;
327	return 0;
328}
329
330#else
331
332static int pxa27x_keypad_build_keycode_from_dt(struct pxa27x_keypad *keypad)
333{
334	dev_info(keypad->input_dev->dev.parent, "missing platform data\n");
335
336	return -EINVAL;
337}
338
339#endif
340
341static int pxa27x_keypad_build_keycode(struct pxa27x_keypad *keypad)
342{
343	const struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
344	struct input_dev *input_dev = keypad->input_dev;
345	unsigned short keycode;
346	int i;
347	int error;
348
349	error = matrix_keypad_build_keymap(pdata->matrix_keymap_data, NULL,
350					   pdata->matrix_key_rows,
351					   pdata->matrix_key_cols,
352					   keypad->keycodes, input_dev);
353	if (error)
354		return error;
355
356	/*
357	 * The keycodes may not only include matrix keys but also the direct
358	 * or rotary keys.
359	 */
360	input_dev->keycodemax = ARRAY_SIZE(keypad->keycodes);
361
362	/* For direct keys. */
363	for (i = 0; i < pdata->direct_key_num; i++) {
364		keycode = pdata->direct_key_map[i];
365		keypad->keycodes[MAX_MATRIX_KEY_NUM + i] = keycode;
366		__set_bit(keycode, input_dev->keybit);
367	}
368
369	if (pdata->enable_rotary0) {
370		if (pdata->rotary0_up_key && pdata->rotary0_down_key) {
371			keycode = pdata->rotary0_up_key;
372			keypad->keycodes[MAX_MATRIX_KEY_NUM + 0] = keycode;
373			__set_bit(keycode, input_dev->keybit);
374
375			keycode = pdata->rotary0_down_key;
376			keypad->keycodes[MAX_MATRIX_KEY_NUM + 1] = keycode;
377			__set_bit(keycode, input_dev->keybit);
378
379			keypad->rotary_rel_code[0] = -1;
380		} else {
381			keypad->rotary_rel_code[0] = pdata->rotary0_rel_code;
382			__set_bit(pdata->rotary0_rel_code, input_dev->relbit);
383		}
384	}
385
386	if (pdata->enable_rotary1) {
387		if (pdata->rotary1_up_key && pdata->rotary1_down_key) {
388			keycode = pdata->rotary1_up_key;
389			keypad->keycodes[MAX_MATRIX_KEY_NUM + 2] = keycode;
390			__set_bit(keycode, input_dev->keybit);
391
392			keycode = pdata->rotary1_down_key;
393			keypad->keycodes[MAX_MATRIX_KEY_NUM + 3] = keycode;
394			__set_bit(keycode, input_dev->keybit);
395
396			keypad->rotary_rel_code[1] = -1;
397		} else {
398			keypad->rotary_rel_code[1] = pdata->rotary1_rel_code;
399			__set_bit(pdata->rotary1_rel_code, input_dev->relbit);
400		}
401	}
402
403	__clear_bit(KEY_RESERVED, input_dev->keybit);
404
405	return 0;
406}
407
408static void pxa27x_keypad_scan_matrix(struct pxa27x_keypad *keypad)
409{
410	const struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
411	struct input_dev *input_dev = keypad->input_dev;
412	int row, col, num_keys_pressed = 0;
413	uint32_t new_state[MAX_MATRIX_KEY_COLS];
414	uint32_t kpas = keypad_readl(KPAS);
415
416	num_keys_pressed = KPAS_MUKP(kpas);
417
418	memset(new_state, 0, sizeof(new_state));
419
420	if (num_keys_pressed == 0)
421		goto scan;
422
423	if (num_keys_pressed == 1) {
424		col = KPAS_CP(kpas);
425		row = KPAS_RP(kpas);
426
427		/* if invalid row/col, treat as no key pressed */
428		if (col >= pdata->matrix_key_cols ||
429		    row >= pdata->matrix_key_rows)
430			goto scan;
431
432		new_state[col] = (1 << row);
433		goto scan;
434	}
435
436	if (num_keys_pressed > 1) {
437		uint32_t kpasmkp0 = keypad_readl(KPASMKP0);
438		uint32_t kpasmkp1 = keypad_readl(KPASMKP1);
439		uint32_t kpasmkp2 = keypad_readl(KPASMKP2);
440		uint32_t kpasmkp3 = keypad_readl(KPASMKP3);
441
442		new_state[0] = kpasmkp0 & KPASMKP_MKC_MASK;
443		new_state[1] = (kpasmkp0 >> 16) & KPASMKP_MKC_MASK;
444		new_state[2] = kpasmkp1 & KPASMKP_MKC_MASK;
445		new_state[3] = (kpasmkp1 >> 16) & KPASMKP_MKC_MASK;
446		new_state[4] = kpasmkp2 & KPASMKP_MKC_MASK;
447		new_state[5] = (kpasmkp2 >> 16) & KPASMKP_MKC_MASK;
448		new_state[6] = kpasmkp3 & KPASMKP_MKC_MASK;
449		new_state[7] = (kpasmkp3 >> 16) & KPASMKP_MKC_MASK;
450	}
451scan:
452	for (col = 0; col < pdata->matrix_key_cols; col++) {
453		uint32_t bits_changed;
454		int code;
455
456		bits_changed = keypad->matrix_key_state[col] ^ new_state[col];
457		if (bits_changed == 0)
458			continue;
459
460		for (row = 0; row < pdata->matrix_key_rows; row++) {
461			if ((bits_changed & (1 << row)) == 0)
462				continue;
463
464			code = MATRIX_SCAN_CODE(row, col, keypad->row_shift);
465
466			input_event(input_dev, EV_MSC, MSC_SCAN, code);
467			input_report_key(input_dev, keypad->keycodes[code],
468					 new_state[col] & (1 << row));
469		}
470	}
471	input_sync(input_dev);
472	memcpy(keypad->matrix_key_state, new_state, sizeof(new_state));
473}
474
475#define DEFAULT_KPREC	(0x007f007f)
476
477static inline int rotary_delta(uint32_t kprec)
478{
479	if (kprec & KPREC_OF0)
480		return (kprec & 0xff) + 0x7f;
481	else if (kprec & KPREC_UF0)
482		return (kprec & 0xff) - 0x7f - 0xff;
483	else
484		return (kprec & 0xff) - 0x7f;
485}
486
487static void report_rotary_event(struct pxa27x_keypad *keypad, int r, int delta)
488{
489	struct input_dev *dev = keypad->input_dev;
490
491	if (delta == 0)
492		return;
493
494	if (keypad->rotary_rel_code[r] == -1) {
495		int code = MAX_MATRIX_KEY_NUM + 2 * r + (delta > 0 ? 0 : 1);
496		unsigned char keycode = keypad->keycodes[code];
497
498		/* simulate a press-n-release */
499		input_event(dev, EV_MSC, MSC_SCAN, code);
500		input_report_key(dev, keycode, 1);
501		input_sync(dev);
502		input_event(dev, EV_MSC, MSC_SCAN, code);
503		input_report_key(dev, keycode, 0);
504		input_sync(dev);
505	} else {
506		input_report_rel(dev, keypad->rotary_rel_code[r], delta);
507		input_sync(dev);
508	}
509}
510
511static void pxa27x_keypad_scan_rotary(struct pxa27x_keypad *keypad)
512{
513	const struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
514	uint32_t kprec;
515
516	/* read and reset to default count value */
517	kprec = keypad_readl(KPREC);
518	keypad_writel(KPREC, DEFAULT_KPREC);
519
520	if (pdata->enable_rotary0)
521		report_rotary_event(keypad, 0, rotary_delta(kprec));
522
523	if (pdata->enable_rotary1)
524		report_rotary_event(keypad, 1, rotary_delta(kprec >> 16));
525}
526
527static void pxa27x_keypad_scan_direct(struct pxa27x_keypad *keypad)
528{
529	const struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
530	struct input_dev *input_dev = keypad->input_dev;
531	unsigned int new_state;
532	uint32_t kpdk, bits_changed;
533	int i;
534
535	kpdk = keypad_readl(KPDK);
536
537	if (pdata->enable_rotary0 || pdata->enable_rotary1)
538		pxa27x_keypad_scan_rotary(keypad);
539
540	/*
541	 * The KPDR_DK only output the key pin level, so it relates to board,
542	 * and low level may be active.
543	 */
544	if (pdata->direct_key_low_active)
545		new_state = ~KPDK_DK(kpdk) & keypad->direct_key_mask;
546	else
547		new_state = KPDK_DK(kpdk) & keypad->direct_key_mask;
548
549	bits_changed = keypad->direct_key_state ^ new_state;
550
551	if (bits_changed == 0)
552		return;
553
554	for (i = 0; i < pdata->direct_key_num; i++) {
555		if (bits_changed & (1 << i)) {
556			int code = MAX_MATRIX_KEY_NUM + i;
557
558			input_event(input_dev, EV_MSC, MSC_SCAN, code);
559			input_report_key(input_dev, keypad->keycodes[code],
560					 new_state & (1 << i));
561		}
562	}
563	input_sync(input_dev);
564	keypad->direct_key_state = new_state;
565}
566
567static void clear_wakeup_event(struct pxa27x_keypad *keypad)
568{
569	const struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
570
571	if (pdata->clear_wakeup_event)
572		(pdata->clear_wakeup_event)();
573}
574
575static irqreturn_t pxa27x_keypad_irq_handler(int irq, void *dev_id)
576{
577	struct pxa27x_keypad *keypad = dev_id;
578	unsigned long kpc = keypad_readl(KPC);
579
580	clear_wakeup_event(keypad);
581
582	if (kpc & KPC_DI)
583		pxa27x_keypad_scan_direct(keypad);
584
585	if (kpc & KPC_MI)
586		pxa27x_keypad_scan_matrix(keypad);
587
588	return IRQ_HANDLED;
589}
590
591static void pxa27x_keypad_config(struct pxa27x_keypad *keypad)
592{
593	const struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
594	unsigned int mask = 0, direct_key_num = 0;
595	unsigned long kpc = 0;
596
597	/* clear pending interrupt bit */
598	keypad_readl(KPC);
599
600	/* enable matrix keys with automatic scan */
601	if (pdata->matrix_key_rows && pdata->matrix_key_cols) {
602		kpc |= KPC_ASACT | KPC_MIE | KPC_ME | KPC_MS_ALL;
603		kpc |= KPC_MKRN(pdata->matrix_key_rows) |
604		       KPC_MKCN(pdata->matrix_key_cols);
605	}
606
607	/* enable rotary key, debounce interval same as direct keys */
608	if (pdata->enable_rotary0) {
609		mask |= 0x03;
610		direct_key_num = 2;
611		kpc |= KPC_REE0;
612	}
613
614	if (pdata->enable_rotary1) {
615		mask |= 0x0c;
616		direct_key_num = 4;
617		kpc |= KPC_REE1;
618	}
619
620	if (pdata->direct_key_num > direct_key_num)
621		direct_key_num = pdata->direct_key_num;
622
623	/*
624	 * Direct keys usage may not start from KP_DKIN0, check the platfrom
625	 * mask data to config the specific.
626	 */
627	if (pdata->direct_key_mask)
628		keypad->direct_key_mask = pdata->direct_key_mask;
629	else
630		keypad->direct_key_mask = ((1 << direct_key_num) - 1) & ~mask;
631
632	/* enable direct key */
633	if (direct_key_num)
634		kpc |= KPC_DE | KPC_DIE | KPC_DKN(direct_key_num);
635
636	keypad_writel(KPC, kpc | KPC_RE_ZERO_DEB);
637	keypad_writel(KPREC, DEFAULT_KPREC);
638	keypad_writel(KPKDI, pdata->debounce_interval);
639}
640
641static int pxa27x_keypad_open(struct input_dev *dev)
642{
643	struct pxa27x_keypad *keypad = input_get_drvdata(dev);
644	int ret;
645	/* Enable unit clock */
646	ret = clk_prepare_enable(keypad->clk);
647	if (ret)
648		return ret;
649
 
 
650	pxa27x_keypad_config(keypad);
651
652	return 0;
653}
654
655static void pxa27x_keypad_close(struct input_dev *dev)
656{
657	struct pxa27x_keypad *keypad = input_get_drvdata(dev);
658
659	/* Disable clock unit */
660	clk_disable_unprepare(keypad->clk);
661}
662
 
663static int pxa27x_keypad_suspend(struct device *dev)
664{
665	struct platform_device *pdev = to_platform_device(dev);
666	struct pxa27x_keypad *keypad = platform_get_drvdata(pdev);
667
668	/*
669	 * If the keypad is used a wake up source, clock can not be disabled.
670	 * Or it can not detect the key pressing.
671	 */
672	if (device_may_wakeup(&pdev->dev))
673		enable_irq_wake(keypad->irq);
674	else
675		clk_disable_unprepare(keypad->clk);
676
677	return 0;
678}
679
680static int pxa27x_keypad_resume(struct device *dev)
681{
682	struct platform_device *pdev = to_platform_device(dev);
683	struct pxa27x_keypad *keypad = platform_get_drvdata(pdev);
684	struct input_dev *input_dev = keypad->input_dev;
685	int ret = 0;
686
687	/*
688	 * If the keypad is used as wake up source, the clock is not turned
689	 * off. So do not need configure it again.
690	 */
691	if (device_may_wakeup(&pdev->dev)) {
692		disable_irq_wake(keypad->irq);
693	} else {
694		mutex_lock(&input_dev->mutex);
695
696		if (input_device_enabled(input_dev)) {
697			/* Enable unit clock */
698			ret = clk_prepare_enable(keypad->clk);
699			if (!ret)
700				pxa27x_keypad_config(keypad);
701		}
702
703		mutex_unlock(&input_dev->mutex);
704	}
705
706	return ret;
707}
708
709static DEFINE_SIMPLE_DEV_PM_OPS(pxa27x_keypad_pm_ops,
710				pxa27x_keypad_suspend, pxa27x_keypad_resume);
711
 
 
712
713static int pxa27x_keypad_probe(struct platform_device *pdev)
714{
715	const struct pxa27x_keypad_platform_data *pdata =
716					dev_get_platdata(&pdev->dev);
717	struct device_node *np = pdev->dev.of_node;
718	struct pxa27x_keypad *keypad;
719	struct input_dev *input_dev;
 
720	int irq, error;
721
722	/* Driver need build keycode from device tree or pdata */
723	if (!np && !pdata)
724		return -EINVAL;
 
725
726	irq = platform_get_irq(pdev, 0);
727	if (irq < 0)
 
728		return -ENXIO;
 
729
730	keypad = devm_kzalloc(&pdev->dev, sizeof(*keypad),
731			      GFP_KERNEL);
732	if (!keypad)
733		return -ENOMEM;
734
735	input_dev = devm_input_allocate_device(&pdev->dev);
736	if (!input_dev)
737		return -ENOMEM;
 
 
 
 
 
738
739	keypad->pdata = pdata;
740	keypad->input_dev = input_dev;
741	keypad->irq = irq;
742
743	keypad->mmio_base = devm_platform_ioremap_resource(pdev, 0);
744	if (IS_ERR(keypad->mmio_base))
745		return PTR_ERR(keypad->mmio_base);
 
 
 
746
747	keypad->clk = devm_clk_get(&pdev->dev, NULL);
 
 
 
 
 
 
 
748	if (IS_ERR(keypad->clk)) {
749		dev_err(&pdev->dev, "failed to get keypad clock\n");
750		return PTR_ERR(keypad->clk);
 
751	}
752
753	input_dev->name = pdev->name;
754	input_dev->id.bustype = BUS_HOST;
755	input_dev->open = pxa27x_keypad_open;
756	input_dev->close = pxa27x_keypad_close;
757	input_dev->dev.parent = &pdev->dev;
758
759	input_dev->keycode = keypad->keycodes;
760	input_dev->keycodesize = sizeof(keypad->keycodes[0]);
761	input_dev->keycodemax = ARRAY_SIZE(keypad->keycodes);
762
763	input_set_drvdata(input_dev, keypad);
764
765	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
766	input_set_capability(input_dev, EV_MSC, MSC_SCAN);
767
768	if (pdata) {
769		error = pxa27x_keypad_build_keycode(keypad);
770	} else {
771		error = pxa27x_keypad_build_keycode_from_dt(keypad);
772		/*
773		 * Data that we get from DT resides in dynamically
774		 * allocated memory so we need to update our pdata
775		 * pointer.
776		 */
777		pdata = keypad->pdata;
778	}
779	if (error) {
780		dev_err(&pdev->dev, "failed to build keycode\n");
781		return error;
782	}
783
784	keypad->row_shift = get_count_order(pdata->matrix_key_cols);
785
786	if ((pdata->enable_rotary0 && keypad->rotary_rel_code[0] != -1) ||
787	    (pdata->enable_rotary1 && keypad->rotary_rel_code[1] != -1)) {
788		input_dev->evbit[0] |= BIT_MASK(EV_REL);
789	}
790
791	error = devm_request_irq(&pdev->dev, irq, pxa27x_keypad_irq_handler,
792				 0, pdev->name, keypad);
793	if (error) {
794		dev_err(&pdev->dev, "failed to request IRQ\n");
795		return error;
796	}
797
798	/* Register the input device */
799	error = input_register_device(input_dev);
800	if (error) {
801		dev_err(&pdev->dev, "failed to register input device\n");
802		return error;
803	}
804
805	platform_set_drvdata(pdev, keypad);
806	device_init_wakeup(&pdev->dev, 1);
807
808	return 0;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
809}
810
811#ifdef CONFIG_OF
812static const struct of_device_id pxa27x_keypad_dt_match[] = {
813	{ .compatible = "marvell,pxa27x-keypad" },
814	{},
815};
816MODULE_DEVICE_TABLE(of, pxa27x_keypad_dt_match);
817#endif
818
819static struct platform_driver pxa27x_keypad_driver = {
820	.probe		= pxa27x_keypad_probe,
 
821	.driver		= {
822		.name	= "pxa27x-keypad",
823		.of_match_table = of_match_ptr(pxa27x_keypad_dt_match),
824		.pm	= pm_sleep_ptr(&pxa27x_keypad_pm_ops),
 
 
825	},
826};
827module_platform_driver(pxa27x_keypad_driver);
828
829MODULE_DESCRIPTION("PXA27x Keypad Controller Driver");
830MODULE_LICENSE("GPL");
831/* work with hotplug and coldplug */
832MODULE_ALIAS("platform:pxa27x-keypad");