1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * drivers/i2c/chips/lm8323.c |
4 | * |
5 | * Copyright (C) 2007-2009 Nokia Corporation |
6 | * |
7 | * Written by Daniel Stone <daniel.stone@nokia.com> |
8 | * Timo O. Karjalainen <timo.o.karjalainen@nokia.com> |
9 | * |
10 | * Updated by Felipe Balbi <felipe.balbi@nokia.com> |
11 | */ |
12 | |
13 | #include <linux/module.h> |
14 | #include <linux/i2c.h> |
15 | #include <linux/interrupt.h> |
16 | #include <linux/sched.h> |
17 | #include <linux/mutex.h> |
18 | #include <linux/delay.h> |
19 | #include <linux/input.h> |
20 | #include <linux/leds.h> |
21 | #include <linux/platform_data/lm8323.h> |
22 | #include <linux/pm.h> |
23 | #include <linux/slab.h> |
24 | |
25 | /* Commands to send to the chip. */ |
26 | #define LM8323_CMD_READ_ID 0x80 /* Read chip ID. */ |
27 | #define LM8323_CMD_WRITE_CFG 0x81 /* Set configuration item. */ |
28 | #define LM8323_CMD_READ_INT 0x82 /* Get interrupt status. */ |
29 | #define LM8323_CMD_RESET 0x83 /* Reset, same as external one */ |
30 | #define LM8323_CMD_WRITE_PORT_SEL 0x85 /* Set GPIO in/out. */ |
31 | #define LM8323_CMD_WRITE_PORT_STATE 0x86 /* Set GPIO pullup. */ |
32 | #define LM8323_CMD_READ_PORT_SEL 0x87 /* Get GPIO in/out. */ |
33 | #define LM8323_CMD_READ_PORT_STATE 0x88 /* Get GPIO pullup. */ |
34 | #define LM8323_CMD_READ_FIFO 0x89 /* Read byte from FIFO. */ |
35 | #define LM8323_CMD_RPT_READ_FIFO 0x8a /* Read FIFO (no increment). */ |
36 | #define LM8323_CMD_SET_ACTIVE 0x8b /* Set active time. */ |
37 | #define LM8323_CMD_READ_ERR 0x8c /* Get error status. */ |
38 | #define LM8323_CMD_READ_ROTATOR 0x8e /* Read rotator status. */ |
39 | #define LM8323_CMD_SET_DEBOUNCE 0x8f /* Set debouncing time. */ |
40 | #define LM8323_CMD_SET_KEY_SIZE 0x90 /* Set keypad size. */ |
41 | #define LM8323_CMD_READ_KEY_SIZE 0x91 /* Get keypad size. */ |
42 | #define LM8323_CMD_READ_CFG 0x92 /* Get configuration item. */ |
43 | #define LM8323_CMD_WRITE_CLOCK 0x93 /* Set clock config. */ |
44 | #define LM8323_CMD_READ_CLOCK 0x94 /* Get clock config. */ |
45 | #define LM8323_CMD_PWM_WRITE 0x95 /* Write PWM script. */ |
46 | #define LM8323_CMD_START_PWM 0x96 /* Start PWM engine. */ |
47 | #define LM8323_CMD_STOP_PWM 0x97 /* Stop PWM engine. */ |
48 | |
49 | /* Interrupt status. */ |
50 | #define INT_KEYPAD 0x01 /* Key event. */ |
51 | #define INT_ROTATOR 0x02 /* Rotator event. */ |
52 | #define INT_ERROR 0x08 /* Error: use CMD_READ_ERR. */ |
53 | #define INT_NOINIT 0x10 /* Lost configuration. */ |
54 | #define INT_PWM1 0x20 /* PWM1 stopped. */ |
55 | #define INT_PWM2 0x40 /* PWM2 stopped. */ |
56 | #define INT_PWM3 0x80 /* PWM3 stopped. */ |
57 | |
58 | /* Errors (signalled by INT_ERROR, read with CMD_READ_ERR). */ |
59 | #define ERR_BADPAR 0x01 /* Bad parameter. */ |
60 | #define ERR_CMDUNK 0x02 /* Unknown command. */ |
61 | #define ERR_KEYOVR 0x04 /* Too many keys pressed. */ |
62 | #define ERR_FIFOOVER 0x40 /* FIFO overflow. */ |
63 | |
64 | /* Configuration keys (CMD_{WRITE,READ}_CFG). */ |
65 | #define CFG_MUX1SEL 0x01 /* Select MUX1_OUT input. */ |
66 | #define CFG_MUX1EN 0x02 /* Enable MUX1_OUT. */ |
67 | #define CFG_MUX2SEL 0x04 /* Select MUX2_OUT input. */ |
68 | #define CFG_MUX2EN 0x08 /* Enable MUX2_OUT. */ |
69 | #define CFG_PSIZE 0x20 /* Package size (must be 0). */ |
70 | #define CFG_ROTEN 0x40 /* Enable rotator. */ |
71 | |
72 | /* Clock settings (CMD_{WRITE,READ}_CLOCK). */ |
73 | #define CLK_RCPWM_INTERNAL 0x00 |
74 | #define CLK_RCPWM_EXTERNAL 0x03 |
75 | #define CLK_SLOWCLKEN 0x08 /* Enable 32.768kHz clock. */ |
76 | #define CLK_SLOWCLKOUT 0x40 /* Enable slow pulse output. */ |
77 | |
78 | /* The possible addresses corresponding to CONFIG1 and CONFIG2 pin wirings. */ |
79 | #define LM8323_I2C_ADDR00 (0x84 >> 1) /* 1000 010x */ |
80 | #define LM8323_I2C_ADDR01 (0x86 >> 1) /* 1000 011x */ |
81 | #define LM8323_I2C_ADDR10 (0x88 >> 1) /* 1000 100x */ |
82 | #define LM8323_I2C_ADDR11 (0x8A >> 1) /* 1000 101x */ |
83 | |
84 | /* Key event fifo length */ |
85 | #define LM8323_FIFO_LEN 15 |
86 | |
87 | /* Commands for PWM engine; feed in with PWM_WRITE. */ |
88 | /* Load ramp counter from duty cycle field (range 0 - 0xff). */ |
89 | #define PWM_SET(v) (0x4000 | ((v) & 0xff)) |
90 | /* Go to start of script. */ |
91 | #define PWM_GOTOSTART 0x0000 |
92 | /* |
93 | * Stop engine (generates interrupt). If reset is 1, clear the program |
94 | * counter, else leave it. |
95 | */ |
96 | #define PWM_END(reset) (0xc000 | (!!(reset) << 11)) |
97 | /* |
98 | * Ramp. If s is 1, divide clock by 512, else divide clock by 16. |
99 | * Take t clock scales (up to 63) per step, for n steps (up to 126). |
100 | * If u is set, ramp up, else ramp down. |
101 | */ |
102 | #define PWM_RAMP(s, t, n, u) ((!!(s) << 14) | ((t) & 0x3f) << 8 | \ |
103 | ((n) & 0x7f) | ((u) ? 0 : 0x80)) |
104 | /* |
105 | * Loop (i.e. jump back to pos) for a given number of iterations (up to 63). |
106 | * If cnt is zero, execute until PWM_END is encountered. |
107 | */ |
108 | #define PWM_LOOP(cnt, pos) (0xa000 | (((cnt) & 0x3f) << 7) | \ |
109 | ((pos) & 0x3f)) |
110 | /* |
111 | * Wait for trigger. Argument is a mask of channels, shifted by the channel |
112 | * number, e.g. 0xa for channels 3 and 1. Note that channels are numbered |
113 | * from 1, not 0. |
114 | */ |
115 | #define PWM_WAIT_TRIG(chans) (0xe000 | (((chans) & 0x7) << 6)) |
116 | /* Send trigger. Argument is same as PWM_WAIT_TRIG. */ |
117 | #define PWM_SEND_TRIG(chans) (0xe000 | ((chans) & 0x7)) |
118 | |
119 | struct lm8323_pwm { |
120 | int id; |
121 | int fade_time; |
122 | int brightness; |
123 | int desired_brightness; |
124 | bool enabled; |
125 | bool running; |
126 | /* pwm lock */ |
127 | struct mutex lock; |
128 | struct work_struct work; |
129 | struct led_classdev cdev; |
130 | struct lm8323_chip *chip; |
131 | }; |
132 | |
133 | struct lm8323_chip { |
134 | /* device lock */ |
135 | struct mutex lock; |
136 | struct i2c_client *client; |
137 | struct input_dev *idev; |
138 | bool kp_enabled; |
139 | bool pm_suspend; |
140 | unsigned keys_down; |
141 | char phys[32]; |
142 | unsigned short keymap[LM8323_KEYMAP_SIZE]; |
143 | int size_x; |
144 | int size_y; |
145 | int debounce_time; |
146 | int active_time; |
147 | struct lm8323_pwm pwm[LM8323_NUM_PWMS]; |
148 | }; |
149 | |
150 | #define client_to_lm8323(c) container_of(c, struct lm8323_chip, client) |
151 | #define dev_to_lm8323(d) container_of(d, struct lm8323_chip, client->dev) |
152 | #define cdev_to_pwm(c) container_of(c, struct lm8323_pwm, cdev) |
153 | #define work_to_pwm(w) container_of(w, struct lm8323_pwm, work) |
154 | |
155 | #define LM8323_MAX_DATA 8 |
156 | |
157 | /* |
158 | * To write, we just access the chip's address in write mode, and dump the |
159 | * command and data out on the bus. The command byte and data are taken as |
160 | * sequential u8s out of varargs, to a maximum of LM8323_MAX_DATA. |
161 | */ |
162 | static int lm8323_write(struct lm8323_chip *lm, int len, ...) |
163 | { |
164 | int ret, i; |
165 | va_list ap; |
166 | u8 data[LM8323_MAX_DATA]; |
167 | |
168 | va_start(ap, len); |
169 | |
170 | if (unlikely(len > LM8323_MAX_DATA)) { |
171 | dev_err(&lm->client->dev, "tried to send %d bytes\n" , len); |
172 | va_end(ap); |
173 | return 0; |
174 | } |
175 | |
176 | for (i = 0; i < len; i++) |
177 | data[i] = va_arg(ap, int); |
178 | |
179 | va_end(ap); |
180 | |
181 | /* |
182 | * If the host is asleep while we send the data, we can get a NACK |
183 | * back while it wakes up, so try again, once. |
184 | */ |
185 | ret = i2c_master_send(client: lm->client, buf: data, count: len); |
186 | if (unlikely(ret == -EREMOTEIO)) |
187 | ret = i2c_master_send(client: lm->client, buf: data, count: len); |
188 | if (unlikely(ret != len)) |
189 | dev_err(&lm->client->dev, "sent %d bytes of %d total\n" , |
190 | len, ret); |
191 | |
192 | return ret; |
193 | } |
194 | |
195 | /* |
196 | * To read, we first send the command byte to the chip and end the transaction, |
197 | * then access the chip in read mode, at which point it will send the data. |
198 | */ |
199 | static int lm8323_read(struct lm8323_chip *lm, u8 cmd, u8 *buf, int len) |
200 | { |
201 | int ret; |
202 | |
203 | /* |
204 | * If the host is asleep while we send the byte, we can get a NACK |
205 | * back while it wakes up, so try again, once. |
206 | */ |
207 | ret = i2c_master_send(client: lm->client, buf: &cmd, count: 1); |
208 | if (unlikely(ret == -EREMOTEIO)) |
209 | ret = i2c_master_send(client: lm->client, buf: &cmd, count: 1); |
210 | if (unlikely(ret != 1)) { |
211 | dev_err(&lm->client->dev, "sending read cmd 0x%02x failed\n" , |
212 | cmd); |
213 | return 0; |
214 | } |
215 | |
216 | ret = i2c_master_recv(client: lm->client, buf, count: len); |
217 | if (unlikely(ret != len)) |
218 | dev_err(&lm->client->dev, "wanted %d bytes, got %d\n" , |
219 | len, ret); |
220 | |
221 | return ret; |
222 | } |
223 | |
224 | /* |
225 | * Set the chip active time (idle time before it enters halt). |
226 | */ |
227 | static void lm8323_set_active_time(struct lm8323_chip *lm, int time) |
228 | { |
229 | lm8323_write(lm, len: 2, LM8323_CMD_SET_ACTIVE, time >> 2); |
230 | } |
231 | |
232 | /* |
233 | * The signals are AT-style: the low 7 bits are the keycode, and the top |
234 | * bit indicates the state (1 for down, 0 for up). |
235 | */ |
236 | static inline u8 lm8323_whichkey(u8 event) |
237 | { |
238 | return event & 0x7f; |
239 | } |
240 | |
241 | static inline int lm8323_ispress(u8 event) |
242 | { |
243 | return (event & 0x80) ? 1 : 0; |
244 | } |
245 | |
246 | static void process_keys(struct lm8323_chip *lm) |
247 | { |
248 | u8 event; |
249 | u8 key_fifo[LM8323_FIFO_LEN + 1]; |
250 | int old_keys_down = lm->keys_down; |
251 | int ret; |
252 | int i = 0; |
253 | |
254 | /* |
255 | * Read all key events from the FIFO at once. Next READ_FIFO clears the |
256 | * FIFO even if we didn't read all events previously. |
257 | */ |
258 | ret = lm8323_read(lm, LM8323_CMD_READ_FIFO, buf: key_fifo, LM8323_FIFO_LEN); |
259 | |
260 | if (ret < 0) { |
261 | dev_err(&lm->client->dev, "Failed reading fifo \n" ); |
262 | return; |
263 | } |
264 | key_fifo[ret] = 0; |
265 | |
266 | while ((event = key_fifo[i++])) { |
267 | u8 key = lm8323_whichkey(event); |
268 | int isdown = lm8323_ispress(event); |
269 | unsigned short keycode = lm->keymap[key]; |
270 | |
271 | dev_vdbg(&lm->client->dev, "key 0x%02x %s\n" , |
272 | key, isdown ? "down" : "up" ); |
273 | |
274 | if (lm->kp_enabled) { |
275 | input_event(dev: lm->idev, EV_MSC, MSC_SCAN, value: key); |
276 | input_report_key(dev: lm->idev, code: keycode, value: isdown); |
277 | input_sync(dev: lm->idev); |
278 | } |
279 | |
280 | if (isdown) |
281 | lm->keys_down++; |
282 | else |
283 | lm->keys_down--; |
284 | } |
285 | |
286 | /* |
287 | * Errata: We need to ensure that the chip never enters halt mode |
288 | * during a keypress, so set active time to 0. When it's released, |
289 | * we can enter halt again, so set the active time back to normal. |
290 | */ |
291 | if (!old_keys_down && lm->keys_down) |
292 | lm8323_set_active_time(lm, time: 0); |
293 | if (old_keys_down && !lm->keys_down) |
294 | lm8323_set_active_time(lm, time: lm->active_time); |
295 | } |
296 | |
297 | static void lm8323_process_error(struct lm8323_chip *lm) |
298 | { |
299 | u8 error; |
300 | |
301 | if (lm8323_read(lm, LM8323_CMD_READ_ERR, buf: &error, len: 1) == 1) { |
302 | if (error & ERR_FIFOOVER) |
303 | dev_vdbg(&lm->client->dev, "fifo overflow!\n" ); |
304 | if (error & ERR_KEYOVR) |
305 | dev_vdbg(&lm->client->dev, |
306 | "more than two keys pressed\n" ); |
307 | if (error & ERR_CMDUNK) |
308 | dev_vdbg(&lm->client->dev, |
309 | "unknown command submitted\n" ); |
310 | if (error & ERR_BADPAR) |
311 | dev_vdbg(&lm->client->dev, "bad command parameter\n" ); |
312 | } |
313 | } |
314 | |
315 | static void lm8323_reset(struct lm8323_chip *lm) |
316 | { |
317 | /* The docs say we must pass 0xAA as the data byte. */ |
318 | lm8323_write(lm, len: 2, LM8323_CMD_RESET, 0xAA); |
319 | } |
320 | |
321 | static int lm8323_configure(struct lm8323_chip *lm) |
322 | { |
323 | int keysize = (lm->size_x << 4) | lm->size_y; |
324 | int clock = (CLK_SLOWCLKEN | CLK_RCPWM_EXTERNAL); |
325 | int debounce = lm->debounce_time >> 2; |
326 | int active = lm->active_time >> 2; |
327 | |
328 | /* |
329 | * Active time must be greater than the debounce time: if it's |
330 | * a close-run thing, give ourselves a 12ms buffer. |
331 | */ |
332 | if (debounce >= active) |
333 | active = debounce + 3; |
334 | |
335 | lm8323_write(lm, len: 2, LM8323_CMD_WRITE_CFG, 0); |
336 | lm8323_write(lm, len: 2, LM8323_CMD_WRITE_CLOCK, clock); |
337 | lm8323_write(lm, len: 2, LM8323_CMD_SET_KEY_SIZE, keysize); |
338 | lm8323_set_active_time(lm, time: lm->active_time); |
339 | lm8323_write(lm, len: 2, LM8323_CMD_SET_DEBOUNCE, debounce); |
340 | lm8323_write(lm, len: 3, LM8323_CMD_WRITE_PORT_STATE, 0xff, 0xff); |
341 | lm8323_write(lm, len: 3, LM8323_CMD_WRITE_PORT_SEL, 0, 0); |
342 | |
343 | /* |
344 | * Not much we can do about errors at this point, so just hope |
345 | * for the best. |
346 | */ |
347 | |
348 | return 0; |
349 | } |
350 | |
351 | static void pwm_done(struct lm8323_pwm *pwm) |
352 | { |
353 | mutex_lock(&pwm->lock); |
354 | pwm->running = false; |
355 | if (pwm->desired_brightness != pwm->brightness) |
356 | schedule_work(work: &pwm->work); |
357 | mutex_unlock(lock: &pwm->lock); |
358 | } |
359 | |
360 | /* |
361 | * Bottom half: handle the interrupt by posting key events, or dealing with |
362 | * errors appropriately. |
363 | */ |
364 | static irqreturn_t lm8323_irq(int irq, void *_lm) |
365 | { |
366 | struct lm8323_chip *lm = _lm; |
367 | u8 ints; |
368 | int i; |
369 | |
370 | mutex_lock(&lm->lock); |
371 | |
372 | while ((lm8323_read(lm, LM8323_CMD_READ_INT, buf: &ints, len: 1) == 1) && ints) { |
373 | if (likely(ints & INT_KEYPAD)) |
374 | process_keys(lm); |
375 | if (ints & INT_ROTATOR) { |
376 | /* We don't currently support the rotator. */ |
377 | dev_vdbg(&lm->client->dev, "rotator fired\n" ); |
378 | } |
379 | if (ints & INT_ERROR) { |
380 | dev_vdbg(&lm->client->dev, "error!\n" ); |
381 | lm8323_process_error(lm); |
382 | } |
383 | if (ints & INT_NOINIT) { |
384 | dev_err(&lm->client->dev, "chip lost config; " |
385 | "reinitialising\n" ); |
386 | lm8323_configure(lm); |
387 | } |
388 | for (i = 0; i < LM8323_NUM_PWMS; i++) { |
389 | if (ints & (INT_PWM1 << i)) { |
390 | dev_vdbg(&lm->client->dev, |
391 | "pwm%d engine completed\n" , i); |
392 | pwm_done(pwm: &lm->pwm[i]); |
393 | } |
394 | } |
395 | } |
396 | |
397 | mutex_unlock(lock: &lm->lock); |
398 | |
399 | return IRQ_HANDLED; |
400 | } |
401 | |
402 | /* |
403 | * Read the chip ID. |
404 | */ |
405 | static int lm8323_read_id(struct lm8323_chip *lm, u8 *buf) |
406 | { |
407 | int bytes; |
408 | |
409 | bytes = lm8323_read(lm, LM8323_CMD_READ_ID, buf, len: 2); |
410 | if (unlikely(bytes != 2)) |
411 | return -EIO; |
412 | |
413 | return 0; |
414 | } |
415 | |
416 | static void lm8323_write_pwm_one(struct lm8323_pwm *pwm, int pos, u16 cmd) |
417 | { |
418 | lm8323_write(lm: pwm->chip, len: 4, LM8323_CMD_PWM_WRITE, (pos << 2) | pwm->id, |
419 | (cmd & 0xff00) >> 8, cmd & 0x00ff); |
420 | } |
421 | |
422 | /* |
423 | * Write a script into a given PWM engine, concluding with PWM_END. |
424 | * If 'kill' is nonzero, the engine will be shut down at the end |
425 | * of the script, producing a zero output. Otherwise the engine |
426 | * will be kept running at the final PWM level indefinitely. |
427 | */ |
428 | static void lm8323_write_pwm(struct lm8323_pwm *pwm, int kill, |
429 | int len, const u16 *cmds) |
430 | { |
431 | int i; |
432 | |
433 | for (i = 0; i < len; i++) |
434 | lm8323_write_pwm_one(pwm, pos: i, cmd: cmds[i]); |
435 | |
436 | lm8323_write_pwm_one(pwm, pos: i++, PWM_END(kill)); |
437 | lm8323_write(lm: pwm->chip, len: 2, LM8323_CMD_START_PWM, pwm->id); |
438 | pwm->running = true; |
439 | } |
440 | |
441 | static void lm8323_pwm_work(struct work_struct *work) |
442 | { |
443 | struct lm8323_pwm *pwm = work_to_pwm(work); |
444 | int div512, perstep, steps, hz, up, kill; |
445 | u16 pwm_cmds[3]; |
446 | int num_cmds = 0; |
447 | |
448 | mutex_lock(&pwm->lock); |
449 | |
450 | /* |
451 | * Do nothing if we're already at the requested level, |
452 | * or previous setting is not yet complete. In the latter |
453 | * case we will be called again when the previous PWM script |
454 | * finishes. |
455 | */ |
456 | if (pwm->running || pwm->desired_brightness == pwm->brightness) |
457 | goto out; |
458 | |
459 | kill = (pwm->desired_brightness == 0); |
460 | up = (pwm->desired_brightness > pwm->brightness); |
461 | steps = abs(pwm->desired_brightness - pwm->brightness); |
462 | |
463 | /* |
464 | * Convert time (in ms) into a divisor (512 or 16 on a refclk of |
465 | * 32768Hz), and number of ticks per step. |
466 | */ |
467 | if ((pwm->fade_time / steps) > (32768 / 512)) { |
468 | div512 = 1; |
469 | hz = 32768 / 512; |
470 | } else { |
471 | div512 = 0; |
472 | hz = 32768 / 16; |
473 | } |
474 | |
475 | perstep = (hz * pwm->fade_time) / (steps * 1000); |
476 | |
477 | if (perstep == 0) |
478 | perstep = 1; |
479 | else if (perstep > 63) |
480 | perstep = 63; |
481 | |
482 | while (steps) { |
483 | int s; |
484 | |
485 | s = min(126, steps); |
486 | pwm_cmds[num_cmds++] = PWM_RAMP(div512, perstep, s, up); |
487 | steps -= s; |
488 | } |
489 | |
490 | lm8323_write_pwm(pwm, kill, len: num_cmds, cmds: pwm_cmds); |
491 | pwm->brightness = pwm->desired_brightness; |
492 | |
493 | out: |
494 | mutex_unlock(lock: &pwm->lock); |
495 | } |
496 | |
497 | static void lm8323_pwm_set_brightness(struct led_classdev *led_cdev, |
498 | enum led_brightness brightness) |
499 | { |
500 | struct lm8323_pwm *pwm = cdev_to_pwm(led_cdev); |
501 | struct lm8323_chip *lm = pwm->chip; |
502 | |
503 | mutex_lock(&pwm->lock); |
504 | pwm->desired_brightness = brightness; |
505 | mutex_unlock(lock: &pwm->lock); |
506 | |
507 | if (in_interrupt()) { |
508 | schedule_work(work: &pwm->work); |
509 | } else { |
510 | /* |
511 | * Schedule PWM work as usual unless we are going into suspend |
512 | */ |
513 | mutex_lock(&lm->lock); |
514 | if (likely(!lm->pm_suspend)) |
515 | schedule_work(work: &pwm->work); |
516 | else |
517 | lm8323_pwm_work(work: &pwm->work); |
518 | mutex_unlock(lock: &lm->lock); |
519 | } |
520 | } |
521 | |
522 | static ssize_t lm8323_pwm_show_time(struct device *dev, |
523 | struct device_attribute *attr, char *buf) |
524 | { |
525 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
526 | struct lm8323_pwm *pwm = cdev_to_pwm(led_cdev); |
527 | |
528 | return sprintf(buf, fmt: "%d\n" , pwm->fade_time); |
529 | } |
530 | |
531 | static ssize_t lm8323_pwm_store_time(struct device *dev, |
532 | struct device_attribute *attr, const char *buf, size_t len) |
533 | { |
534 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
535 | struct lm8323_pwm *pwm = cdev_to_pwm(led_cdev); |
536 | int ret, time; |
537 | |
538 | ret = kstrtoint(s: buf, base: 10, res: &time); |
539 | /* Numbers only, please. */ |
540 | if (ret) |
541 | return ret; |
542 | |
543 | pwm->fade_time = time; |
544 | |
545 | return strlen(buf); |
546 | } |
547 | static DEVICE_ATTR(time, 0644, lm8323_pwm_show_time, lm8323_pwm_store_time); |
548 | |
549 | static struct attribute *lm8323_pwm_attrs[] = { |
550 | &dev_attr_time.attr, |
551 | NULL |
552 | }; |
553 | ATTRIBUTE_GROUPS(lm8323_pwm); |
554 | |
555 | static int init_pwm(struct lm8323_chip *lm, int id, struct device *dev, |
556 | const char *name) |
557 | { |
558 | struct lm8323_pwm *pwm; |
559 | int err; |
560 | |
561 | BUG_ON(id > 3); |
562 | |
563 | pwm = &lm->pwm[id - 1]; |
564 | |
565 | pwm->id = id; |
566 | pwm->fade_time = 0; |
567 | pwm->brightness = 0; |
568 | pwm->desired_brightness = 0; |
569 | pwm->running = false; |
570 | pwm->enabled = false; |
571 | INIT_WORK(&pwm->work, lm8323_pwm_work); |
572 | mutex_init(&pwm->lock); |
573 | pwm->chip = lm; |
574 | |
575 | if (name) { |
576 | pwm->cdev.name = name; |
577 | pwm->cdev.brightness_set = lm8323_pwm_set_brightness; |
578 | pwm->cdev.groups = lm8323_pwm_groups; |
579 | |
580 | err = devm_led_classdev_register(parent: dev, led_cdev: &pwm->cdev); |
581 | if (err) { |
582 | dev_err(dev, "couldn't register PWM %d: %d\n" , id, err); |
583 | return err; |
584 | } |
585 | pwm->enabled = true; |
586 | } |
587 | |
588 | return 0; |
589 | } |
590 | |
591 | static ssize_t lm8323_show_disable(struct device *dev, |
592 | struct device_attribute *attr, char *buf) |
593 | { |
594 | struct lm8323_chip *lm = dev_get_drvdata(dev); |
595 | |
596 | return sprintf(buf, fmt: "%u\n" , !lm->kp_enabled); |
597 | } |
598 | |
599 | static ssize_t lm8323_set_disable(struct device *dev, |
600 | struct device_attribute *attr, |
601 | const char *buf, size_t count) |
602 | { |
603 | struct lm8323_chip *lm = dev_get_drvdata(dev); |
604 | int ret; |
605 | unsigned int i; |
606 | |
607 | ret = kstrtouint(s: buf, base: 10, res: &i); |
608 | if (ret) |
609 | return ret; |
610 | |
611 | mutex_lock(&lm->lock); |
612 | lm->kp_enabled = !i; |
613 | mutex_unlock(lock: &lm->lock); |
614 | |
615 | return count; |
616 | } |
617 | static DEVICE_ATTR(disable_kp, 0644, lm8323_show_disable, lm8323_set_disable); |
618 | |
619 | static struct attribute *lm8323_attrs[] = { |
620 | &dev_attr_disable_kp.attr, |
621 | NULL, |
622 | }; |
623 | ATTRIBUTE_GROUPS(lm8323); |
624 | |
625 | static int lm8323_probe(struct i2c_client *client) |
626 | { |
627 | struct lm8323_platform_data *pdata = dev_get_platdata(dev: &client->dev); |
628 | struct input_dev *idev; |
629 | struct lm8323_chip *lm; |
630 | int pwm; |
631 | int i, err; |
632 | unsigned long tmo; |
633 | u8 data[2]; |
634 | |
635 | if (!pdata || !pdata->size_x || !pdata->size_y) { |
636 | dev_err(&client->dev, "missing platform_data\n" ); |
637 | return -EINVAL; |
638 | } |
639 | |
640 | if (pdata->size_x > 8) { |
641 | dev_err(&client->dev, "invalid x size %d specified\n" , |
642 | pdata->size_x); |
643 | return -EINVAL; |
644 | } |
645 | |
646 | if (pdata->size_y > 12) { |
647 | dev_err(&client->dev, "invalid y size %d specified\n" , |
648 | pdata->size_y); |
649 | return -EINVAL; |
650 | } |
651 | |
652 | lm = devm_kzalloc(dev: &client->dev, size: sizeof(*lm), GFP_KERNEL); |
653 | if (!lm) |
654 | return -ENOMEM; |
655 | |
656 | idev = devm_input_allocate_device(&client->dev); |
657 | if (!idev) |
658 | return -ENOMEM; |
659 | |
660 | lm->client = client; |
661 | lm->idev = idev; |
662 | mutex_init(&lm->lock); |
663 | |
664 | lm->size_x = pdata->size_x; |
665 | lm->size_y = pdata->size_y; |
666 | dev_vdbg(&client->dev, "Keypad size: %d x %d\n" , |
667 | lm->size_x, lm->size_y); |
668 | |
669 | lm->debounce_time = pdata->debounce_time; |
670 | lm->active_time = pdata->active_time; |
671 | |
672 | lm8323_reset(lm); |
673 | |
674 | /* |
675 | * Nothing's set up to service the IRQ yet, so just spin for max. |
676 | * 100ms until we can configure. |
677 | */ |
678 | tmo = jiffies + msecs_to_jiffies(m: 100); |
679 | while (lm8323_read(lm, LM8323_CMD_READ_INT, buf: data, len: 1) == 1) { |
680 | if (data[0] & INT_NOINIT) |
681 | break; |
682 | |
683 | if (time_after(jiffies, tmo)) { |
684 | dev_err(&client->dev, |
685 | "timeout waiting for initialisation\n" ); |
686 | break; |
687 | } |
688 | |
689 | msleep(msecs: 1); |
690 | } |
691 | |
692 | lm8323_configure(lm); |
693 | |
694 | /* If a true probe check the device */ |
695 | if (lm8323_read_id(lm, buf: data) != 0) { |
696 | dev_err(&client->dev, "device not found\n" ); |
697 | return -ENODEV; |
698 | } |
699 | |
700 | for (pwm = 0; pwm < LM8323_NUM_PWMS; pwm++) { |
701 | err = init_pwm(lm, id: pwm + 1, dev: &client->dev, |
702 | name: pdata->pwm_names[pwm]); |
703 | if (err) |
704 | return err; |
705 | } |
706 | |
707 | lm->kp_enabled = true; |
708 | |
709 | idev->name = pdata->name ? : "LM8323 keypad" ; |
710 | snprintf(buf: lm->phys, size: sizeof(lm->phys), |
711 | fmt: "%s/input-kp" , dev_name(dev: &client->dev)); |
712 | idev->phys = lm->phys; |
713 | |
714 | idev->evbit[0] = BIT(EV_KEY) | BIT(EV_MSC); |
715 | __set_bit(MSC_SCAN, idev->mscbit); |
716 | for (i = 0; i < LM8323_KEYMAP_SIZE; i++) { |
717 | __set_bit(pdata->keymap[i], idev->keybit); |
718 | lm->keymap[i] = pdata->keymap[i]; |
719 | } |
720 | __clear_bit(KEY_RESERVED, idev->keybit); |
721 | |
722 | if (pdata->repeat) |
723 | __set_bit(EV_REP, idev->evbit); |
724 | |
725 | err = input_register_device(idev); |
726 | if (err) { |
727 | dev_dbg(&client->dev, "error registering input device\n" ); |
728 | return err; |
729 | } |
730 | |
731 | err = devm_request_threaded_irq(dev: &client->dev, irq: client->irq, |
732 | NULL, thread_fn: lm8323_irq, |
733 | IRQF_TRIGGER_LOW | IRQF_ONESHOT, |
734 | devname: "lm8323" , dev_id: lm); |
735 | if (err) { |
736 | dev_err(&client->dev, "could not get IRQ %d\n" , client->irq); |
737 | return err; |
738 | } |
739 | |
740 | i2c_set_clientdata(client, data: lm); |
741 | |
742 | device_init_wakeup(dev: &client->dev, enable: 1); |
743 | enable_irq_wake(irq: client->irq); |
744 | |
745 | return 0; |
746 | } |
747 | |
748 | /* |
749 | * We don't need to explicitly suspend the chip, as it already switches off |
750 | * when there's no activity. |
751 | */ |
752 | static int lm8323_suspend(struct device *dev) |
753 | { |
754 | struct i2c_client *client = to_i2c_client(dev); |
755 | struct lm8323_chip *lm = i2c_get_clientdata(client); |
756 | int i; |
757 | |
758 | irq_set_irq_wake(irq: client->irq, on: 0); |
759 | disable_irq(irq: client->irq); |
760 | |
761 | mutex_lock(&lm->lock); |
762 | lm->pm_suspend = true; |
763 | mutex_unlock(lock: &lm->lock); |
764 | |
765 | for (i = 0; i < 3; i++) |
766 | if (lm->pwm[i].enabled) |
767 | led_classdev_suspend(led_cdev: &lm->pwm[i].cdev); |
768 | |
769 | return 0; |
770 | } |
771 | |
772 | static int lm8323_resume(struct device *dev) |
773 | { |
774 | struct i2c_client *client = to_i2c_client(dev); |
775 | struct lm8323_chip *lm = i2c_get_clientdata(client); |
776 | int i; |
777 | |
778 | mutex_lock(&lm->lock); |
779 | lm->pm_suspend = false; |
780 | mutex_unlock(lock: &lm->lock); |
781 | |
782 | for (i = 0; i < 3; i++) |
783 | if (lm->pwm[i].enabled) |
784 | led_classdev_resume(led_cdev: &lm->pwm[i].cdev); |
785 | |
786 | enable_irq(irq: client->irq); |
787 | irq_set_irq_wake(irq: client->irq, on: 1); |
788 | |
789 | return 0; |
790 | } |
791 | |
792 | static DEFINE_SIMPLE_DEV_PM_OPS(lm8323_pm_ops, lm8323_suspend, lm8323_resume); |
793 | |
794 | static const struct i2c_device_id lm8323_id[] = { |
795 | { "lm8323" , 0 }, |
796 | { } |
797 | }; |
798 | |
799 | static struct i2c_driver lm8323_i2c_driver = { |
800 | .driver = { |
801 | .name = "lm8323" , |
802 | .pm = pm_sleep_ptr(&lm8323_pm_ops), |
803 | .dev_groups = lm8323_groups, |
804 | }, |
805 | .probe = lm8323_probe, |
806 | .id_table = lm8323_id, |
807 | }; |
808 | MODULE_DEVICE_TABLE(i2c, lm8323_id); |
809 | |
810 | module_i2c_driver(lm8323_i2c_driver); |
811 | |
812 | MODULE_AUTHOR("Timo O. Karjalainen <timo.o.karjalainen@nokia.com>" ); |
813 | MODULE_AUTHOR("Daniel Stone" ); |
814 | MODULE_AUTHOR("Felipe Balbi <felipe.balbi@nokia.com>" ); |
815 | MODULE_DESCRIPTION("LM8323 keypad driver" ); |
816 | MODULE_LICENSE("GPL" ); |
817 | |
818 | |