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 | |
96 | struct 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 |
118 | static 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: &rows, cols: &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 | rows: pdata->matrix_key_rows, |
140 | cols: pdata->matrix_key_cols, |
141 | keymap: keypad->keycodes, input_dev); |
142 | if (error) |
143 | return error; |
144 | |
145 | return 0; |
146 | } |
147 | |
148 | static 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, propname: "marvell,direct-key-count" , |
161 | out_value: &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, propname: "marvell,direct-key-mask" , |
171 | out_value: &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 | propname: "marvell,direct-key-low-active" ); |
185 | |
186 | prop = of_get_property(node: np, name: "marvell,direct-key-map" , lenp: &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(p: 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 | |
208 | static 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, propname: relkeyname, out_value: &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(node: np, name: rotaryname[i], lenp: &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(p: 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 | |
281 | static 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, size: 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, propname: "marvell,debounce-interval" , |
314 | out_value: &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 | |
332 | static 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 | |
341 | static 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(keymap_data: pdata->matrix_keymap_data, NULL, |
350 | rows: pdata->matrix_key_rows, |
351 | cols: pdata->matrix_key_cols, |
352 | keymap: 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 | |
408 | static 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 | } |
451 | scan: |
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(dev: input_dev, EV_MSC, MSC_SCAN, value: code); |
467 | input_report_key(dev: input_dev, code: keypad->keycodes[code], |
468 | value: new_state[col] & (1 << row)); |
469 | } |
470 | } |
471 | input_sync(dev: input_dev); |
472 | memcpy(keypad->matrix_key_state, new_state, sizeof(new_state)); |
473 | } |
474 | |
475 | #define DEFAULT_KPREC (0x007f007f) |
476 | |
477 | static 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 | |
487 | static 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, value: code); |
500 | input_report_key(dev, code: keycode, value: 1); |
501 | input_sync(dev); |
502 | input_event(dev, EV_MSC, MSC_SCAN, value: code); |
503 | input_report_key(dev, code: keycode, value: 0); |
504 | input_sync(dev); |
505 | } else { |
506 | input_report_rel(dev, code: keypad->rotary_rel_code[r], value: delta); |
507 | input_sync(dev); |
508 | } |
509 | } |
510 | |
511 | static 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, r: 0, delta: rotary_delta(kprec)); |
522 | |
523 | if (pdata->enable_rotary1) |
524 | report_rotary_event(keypad, r: 1, delta: rotary_delta(kprec: kprec >> 16)); |
525 | } |
526 | |
527 | static 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(dev: input_dev, EV_MSC, MSC_SCAN, value: code); |
559 | input_report_key(dev: input_dev, code: keypad->keycodes[code], |
560 | value: new_state & (1 << i)); |
561 | } |
562 | } |
563 | input_sync(dev: input_dev); |
564 | keypad->direct_key_state = new_state; |
565 | } |
566 | |
567 | static 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 | |
575 | static 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 | |
591 | static 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 | |
641 | static 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(clk: keypad->clk); |
647 | if (ret) |
648 | return ret; |
649 | |
650 | pxa27x_keypad_config(keypad); |
651 | |
652 | return 0; |
653 | } |
654 | |
655 | static 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(clk: keypad->clk); |
661 | } |
662 | |
663 | static 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(dev: &pdev->dev)) |
673 | enable_irq_wake(irq: keypad->irq); |
674 | else |
675 | clk_disable_unprepare(clk: keypad->clk); |
676 | |
677 | return 0; |
678 | } |
679 | |
680 | static 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(dev: &pdev->dev)) { |
692 | disable_irq_wake(irq: keypad->irq); |
693 | } else { |
694 | mutex_lock(&input_dev->mutex); |
695 | |
696 | if (input_device_enabled(dev: input_dev)) { |
697 | /* Enable unit clock */ |
698 | ret = clk_prepare_enable(clk: keypad->clk); |
699 | if (!ret) |
700 | pxa27x_keypad_config(keypad); |
701 | } |
702 | |
703 | mutex_unlock(lock: &input_dev->mutex); |
704 | } |
705 | |
706 | return ret; |
707 | } |
708 | |
709 | static DEFINE_SIMPLE_DEV_PM_OPS(pxa27x_keypad_pm_ops, |
710 | pxa27x_keypad_suspend, pxa27x_keypad_resume); |
711 | |
712 | |
713 | static int pxa27x_keypad_probe(struct platform_device *pdev) |
714 | { |
715 | const struct pxa27x_keypad_platform_data *pdata = |
716 | dev_get_platdata(dev: &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(dev: &pdev->dev, size: 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, index: 0); |
744 | if (IS_ERR(ptr: keypad->mmio_base)) |
745 | return PTR_ERR(ptr: keypad->mmio_base); |
746 | |
747 | keypad->clk = devm_clk_get(dev: &pdev->dev, NULL); |
748 | if (IS_ERR(ptr: keypad->clk)) { |
749 | dev_err(&pdev->dev, "failed to get keypad clock\n" ); |
750 | return PTR_ERR(ptr: 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(dev: input_dev, data: keypad); |
764 | |
765 | input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP); |
766 | input_set_capability(dev: 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(count: 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(dev: &pdev->dev, irq, handler: pxa27x_keypad_irq_handler, |
792 | irqflags: 0, devname: pdev->name, dev_id: 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, data: keypad); |
806 | device_init_wakeup(dev: &pdev->dev, enable: 1); |
807 | |
808 | return 0; |
809 | } |
810 | |
811 | #ifdef CONFIG_OF |
812 | static const struct of_device_id pxa27x_keypad_dt_match[] = { |
813 | { .compatible = "marvell,pxa27x-keypad" }, |
814 | {}, |
815 | }; |
816 | MODULE_DEVICE_TABLE(of, pxa27x_keypad_dt_match); |
817 | #endif |
818 | |
819 | static 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 | }; |
827 | module_platform_driver(pxa27x_keypad_driver); |
828 | |
829 | MODULE_DESCRIPTION("PXA27x Keypad Controller Driver" ); |
830 | MODULE_LICENSE("GPL" ); |
831 | /* work with hotplug and coldplug */ |
832 | MODULE_ALIAS("platform:pxa27x-keypad" ); |
833 | |