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90832ef1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
a48b2d4a FB |
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> | |
a48b2d4a FB |
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> | |
f81126b0 | 21 | #include <linux/platform_data/lm8323.h> |
65b0c038 | 22 | #include <linux/pm.h> |
5a0e3ad6 | 23 | #include <linux/slab.h> |
a48b2d4a FB |
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; | |
a48b2d4a FB |
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) | |
a48b2d4a FB |
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(lm->client, data, len); | |
186 | if (unlikely(ret == -EREMOTEIO)) | |
187 | ret = i2c_master_send(lm->client, data, 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(lm->client, &cmd, 1); | |
208 | if (unlikely(ret == -EREMOTEIO)) | |
209 | ret = i2c_master_send(lm->client, &cmd, 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(lm->client, buf, 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, 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, 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(lm->idev, EV_MSC, MSC_SCAN, key); | |
276 | input_report_key(lm->idev, keycode, isdown); | |
277 | input_sync(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, 0); | |
293 | if (old_keys_down && !lm->keys_down) | |
294 | lm8323_set_active_time(lm, 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, &error, 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, 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, 2, LM8323_CMD_WRITE_CFG, 0); | |
336 | lm8323_write(lm, 2, LM8323_CMD_WRITE_CLOCK, clock); | |
337 | lm8323_write(lm, 2, LM8323_CMD_SET_KEY_SIZE, keysize); | |
338 | lm8323_set_active_time(lm, lm->active_time); | |
339 | lm8323_write(lm, 2, LM8323_CMD_SET_DEBOUNCE, debounce); | |
340 | lm8323_write(lm, 3, LM8323_CMD_WRITE_PORT_STATE, 0xff, 0xff); | |
341 | lm8323_write(lm, 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(&pwm->work); | |
357 | mutex_unlock(&pwm->lock); | |
358 | } | |
359 | ||
360 | /* | |
361 | * Bottom half: handle the interrupt by posting key events, or dealing with | |
362 | * errors appropriately. | |
363 | */ | |
61cf3813 | 364 | static irqreturn_t lm8323_irq(int irq, void *_lm) |
a48b2d4a | 365 | { |
61cf3813 | 366 | struct lm8323_chip *lm = _lm; |
a48b2d4a FB |
367 | u8 ints; |
368 | int i; | |
369 | ||
370 | mutex_lock(&lm->lock); | |
371 | ||
372 | while ((lm8323_read(lm, LM8323_CMD_READ_INT, &ints, 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++) { | |
bec7a4bb | 389 | if (ints & (INT_PWM1 << i)) { |
a48b2d4a FB |
390 | dev_vdbg(&lm->client->dev, |
391 | "pwm%d engine completed\n", i); | |
392 | pwm_done(&lm->pwm[i]); | |
393 | } | |
394 | } | |
395 | } | |
396 | ||
397 | mutex_unlock(&lm->lock); | |
a48b2d4a FB |
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, 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(pwm->chip, 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, i, cmds[i]); | |
435 | ||
436 | lm8323_write_pwm_one(pwm, i++, PWM_END(kill)); | |
437 | lm8323_write(pwm->chip, 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, num_cmds, pwm_cmds); | |
491 | pwm->brightness = pwm->desired_brightness; | |
492 | ||
493 | out: | |
494 | mutex_unlock(&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(&pwm->lock); | |
506 | ||
507 | if (in_interrupt()) { | |
508 | schedule_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(&pwm->work); | |
516 | else | |
517 | lm8323_pwm_work(&pwm->work); | |
518 | mutex_unlock(&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, "%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); | |
76496e7a | 536 | int ret, time; |
a48b2d4a | 537 | |
76496e7a | 538 | ret = kstrtoint(buf, 10, &time); |
a48b2d4a FB |
539 | /* Numbers only, please. */ |
540 | if (ret) | |
76496e7a | 541 | return ret; |
a48b2d4a FB |
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 | ||
f254bea4 JH |
549 | static struct attribute *lm8323_pwm_attrs[] = { |
550 | &dev_attr_time.attr, | |
551 | NULL | |
552 | }; | |
553 | ATTRIBUTE_GROUPS(lm8323_pwm); | |
554 | ||
a48b2d4a FB |
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 | ||
560 | BUG_ON(id > 3); | |
561 | ||
562 | pwm = &lm->pwm[id - 1]; | |
563 | ||
564 | pwm->id = id; | |
565 | pwm->fade_time = 0; | |
566 | pwm->brightness = 0; | |
567 | pwm->desired_brightness = 0; | |
568 | pwm->running = false; | |
569 | pwm->enabled = false; | |
570 | INIT_WORK(&pwm->work, lm8323_pwm_work); | |
571 | mutex_init(&pwm->lock); | |
572 | pwm->chip = lm; | |
573 | ||
574 | if (name) { | |
575 | pwm->cdev.name = name; | |
576 | pwm->cdev.brightness_set = lm8323_pwm_set_brightness; | |
f254bea4 | 577 | pwm->cdev.groups = lm8323_pwm_groups; |
a48b2d4a FB |
578 | if (led_classdev_register(dev, &pwm->cdev) < 0) { |
579 | dev_err(dev, "couldn't register PWM %d\n", id); | |
580 | return -1; | |
581 | } | |
a48b2d4a FB |
582 | pwm->enabled = true; |
583 | } | |
584 | ||
585 | return 0; | |
586 | } | |
587 | ||
588 | static struct i2c_driver lm8323_i2c_driver; | |
589 | ||
590 | static ssize_t lm8323_show_disable(struct device *dev, | |
591 | struct device_attribute *attr, char *buf) | |
592 | { | |
593 | struct lm8323_chip *lm = dev_get_drvdata(dev); | |
594 | ||
595 | return sprintf(buf, "%u\n", !lm->kp_enabled); | |
596 | } | |
597 | ||
598 | static ssize_t lm8323_set_disable(struct device *dev, | |
599 | struct device_attribute *attr, | |
600 | const char *buf, size_t count) | |
601 | { | |
602 | struct lm8323_chip *lm = dev_get_drvdata(dev); | |
603 | int ret; | |
76496e7a | 604 | unsigned int i; |
a48b2d4a | 605 | |
76496e7a | 606 | ret = kstrtouint(buf, 10, &i); |
3b5005e9 DC |
607 | if (ret) |
608 | return ret; | |
a48b2d4a FB |
609 | |
610 | mutex_lock(&lm->lock); | |
611 | lm->kp_enabled = !i; | |
612 | mutex_unlock(&lm->lock); | |
613 | ||
614 | return count; | |
615 | } | |
616 | static DEVICE_ATTR(disable_kp, 0644, lm8323_show_disable, lm8323_set_disable); | |
617 | ||
5298cc4c | 618 | static int lm8323_probe(struct i2c_client *client, |
a48b2d4a FB |
619 | const struct i2c_device_id *id) |
620 | { | |
c838cb3d | 621 | struct lm8323_platform_data *pdata = dev_get_platdata(&client->dev); |
a48b2d4a FB |
622 | struct input_dev *idev; |
623 | struct lm8323_chip *lm; | |
1796b983 | 624 | int pwm; |
a48b2d4a FB |
625 | int i, err; |
626 | unsigned long tmo; | |
627 | u8 data[2]; | |
628 | ||
629 | if (!pdata || !pdata->size_x || !pdata->size_y) { | |
630 | dev_err(&client->dev, "missing platform_data\n"); | |
631 | return -EINVAL; | |
632 | } | |
633 | ||
634 | if (pdata->size_x > 8) { | |
635 | dev_err(&client->dev, "invalid x size %d specified\n", | |
636 | pdata->size_x); | |
637 | return -EINVAL; | |
638 | } | |
639 | ||
640 | if (pdata->size_y > 12) { | |
641 | dev_err(&client->dev, "invalid y size %d specified\n", | |
642 | pdata->size_y); | |
643 | return -EINVAL; | |
644 | } | |
645 | ||
646 | lm = kzalloc(sizeof *lm, GFP_KERNEL); | |
647 | idev = input_allocate_device(); | |
648 | if (!lm || !idev) { | |
649 | err = -ENOMEM; | |
650 | goto fail1; | |
651 | } | |
652 | ||
a48b2d4a FB |
653 | lm->client = client; |
654 | lm->idev = idev; | |
655 | mutex_init(&lm->lock); | |
a48b2d4a FB |
656 | |
657 | lm->size_x = pdata->size_x; | |
658 | lm->size_y = pdata->size_y; | |
659 | dev_vdbg(&client->dev, "Keypad size: %d x %d\n", | |
660 | lm->size_x, lm->size_y); | |
661 | ||
662 | lm->debounce_time = pdata->debounce_time; | |
663 | lm->active_time = pdata->active_time; | |
664 | ||
665 | lm8323_reset(lm); | |
666 | ||
667 | /* Nothing's set up to service the IRQ yet, so just spin for max. | |
668 | * 100ms until we can configure. */ | |
669 | tmo = jiffies + msecs_to_jiffies(100); | |
670 | while (lm8323_read(lm, LM8323_CMD_READ_INT, data, 1) == 1) { | |
671 | if (data[0] & INT_NOINIT) | |
672 | break; | |
673 | ||
674 | if (time_after(jiffies, tmo)) { | |
675 | dev_err(&client->dev, | |
676 | "timeout waiting for initialisation\n"); | |
677 | break; | |
678 | } | |
679 | ||
680 | msleep(1); | |
681 | } | |
682 | ||
683 | lm8323_configure(lm); | |
684 | ||
685 | /* If a true probe check the device */ | |
686 | if (lm8323_read_id(lm, data) != 0) { | |
687 | dev_err(&client->dev, "device not found\n"); | |
688 | err = -ENODEV; | |
689 | goto fail1; | |
690 | } | |
691 | ||
1796b983 DC |
692 | for (pwm = 0; pwm < LM8323_NUM_PWMS; pwm++) { |
693 | err = init_pwm(lm, pwm + 1, &client->dev, | |
694 | pdata->pwm_names[pwm]); | |
a48b2d4a FB |
695 | if (err < 0) |
696 | goto fail2; | |
697 | } | |
698 | ||
699 | lm->kp_enabled = true; | |
700 | err = device_create_file(&client->dev, &dev_attr_disable_kp); | |
701 | if (err < 0) | |
702 | goto fail2; | |
703 | ||
704 | idev->name = pdata->name ? : "LM8323 keypad"; | |
705 | snprintf(lm->phys, sizeof(lm->phys), | |
706 | "%s/input-kp", dev_name(&client->dev)); | |
707 | idev->phys = lm->phys; | |
708 | ||
709 | idev->evbit[0] = BIT(EV_KEY) | BIT(EV_MSC); | |
710 | __set_bit(MSC_SCAN, idev->mscbit); | |
711 | for (i = 0; i < LM8323_KEYMAP_SIZE; i++) { | |
712 | __set_bit(pdata->keymap[i], idev->keybit); | |
713 | lm->keymap[i] = pdata->keymap[i]; | |
714 | } | |
715 | __clear_bit(KEY_RESERVED, idev->keybit); | |
716 | ||
717 | if (pdata->repeat) | |
718 | __set_bit(EV_REP, idev->evbit); | |
719 | ||
720 | err = input_register_device(idev); | |
721 | if (err) { | |
722 | dev_dbg(&client->dev, "error registering input device\n"); | |
723 | goto fail3; | |
724 | } | |
725 | ||
61cf3813 | 726 | err = request_threaded_irq(client->irq, NULL, lm8323_irq, |
eaa499ae | 727 | IRQF_TRIGGER_LOW|IRQF_ONESHOT, "lm8323", lm); |
a48b2d4a FB |
728 | if (err) { |
729 | dev_err(&client->dev, "could not get IRQ %d\n", client->irq); | |
730 | goto fail4; | |
731 | } | |
732 | ||
a5b33e6a WS |
733 | i2c_set_clientdata(client, lm); |
734 | ||
a48b2d4a FB |
735 | device_init_wakeup(&client->dev, 1); |
736 | enable_irq_wake(client->irq); | |
737 | ||
738 | return 0; | |
739 | ||
740 | fail4: | |
741 | input_unregister_device(idev); | |
742 | idev = NULL; | |
743 | fail3: | |
744 | device_remove_file(&client->dev, &dev_attr_disable_kp); | |
745 | fail2: | |
1796b983 | 746 | while (--pwm >= 0) |
f254bea4 | 747 | if (lm->pwm[pwm].enabled) |
1796b983 | 748 | led_classdev_unregister(&lm->pwm[pwm].cdev); |
a48b2d4a FB |
749 | fail1: |
750 | input_free_device(idev); | |
751 | kfree(lm); | |
752 | return err; | |
753 | } | |
754 | ||
e2619cf7 | 755 | static int lm8323_remove(struct i2c_client *client) |
a48b2d4a FB |
756 | { |
757 | struct lm8323_chip *lm = i2c_get_clientdata(client); | |
758 | int i; | |
759 | ||
760 | disable_irq_wake(client->irq); | |
761 | free_irq(client->irq, lm); | |
a48b2d4a FB |
762 | |
763 | input_unregister_device(lm->idev); | |
764 | ||
765 | device_remove_file(&lm->client->dev, &dev_attr_disable_kp); | |
766 | ||
767 | for (i = 0; i < 3; i++) | |
f254bea4 | 768 | if (lm->pwm[i].enabled) |
a48b2d4a FB |
769 | led_classdev_unregister(&lm->pwm[i].cdev); |
770 | ||
771 | kfree(lm); | |
772 | ||
773 | return 0; | |
774 | } | |
775 | ||
f80aee7f | 776 | #ifdef CONFIG_PM_SLEEP |
a48b2d4a FB |
777 | /* |
778 | * We don't need to explicitly suspend the chip, as it already switches off | |
779 | * when there's no activity. | |
780 | */ | |
65b0c038 | 781 | static int lm8323_suspend(struct device *dev) |
a48b2d4a | 782 | { |
65b0c038 | 783 | struct i2c_client *client = to_i2c_client(dev); |
a48b2d4a FB |
784 | struct lm8323_chip *lm = i2c_get_clientdata(client); |
785 | int i; | |
786 | ||
dced35ae | 787 | irq_set_irq_wake(client->irq, 0); |
a48b2d4a FB |
788 | disable_irq(client->irq); |
789 | ||
790 | mutex_lock(&lm->lock); | |
791 | lm->pm_suspend = true; | |
792 | mutex_unlock(&lm->lock); | |
793 | ||
794 | for (i = 0; i < 3; i++) | |
795 | if (lm->pwm[i].enabled) | |
796 | led_classdev_suspend(&lm->pwm[i].cdev); | |
797 | ||
798 | return 0; | |
799 | } | |
800 | ||
65b0c038 | 801 | static int lm8323_resume(struct device *dev) |
a48b2d4a | 802 | { |
65b0c038 | 803 | struct i2c_client *client = to_i2c_client(dev); |
a48b2d4a FB |
804 | struct lm8323_chip *lm = i2c_get_clientdata(client); |
805 | int i; | |
806 | ||
807 | mutex_lock(&lm->lock); | |
808 | lm->pm_suspend = false; | |
809 | mutex_unlock(&lm->lock); | |
810 | ||
811 | for (i = 0; i < 3; i++) | |
812 | if (lm->pwm[i].enabled) | |
813 | led_classdev_resume(&lm->pwm[i].cdev); | |
814 | ||
815 | enable_irq(client->irq); | |
dced35ae | 816 | irq_set_irq_wake(client->irq, 1); |
a48b2d4a FB |
817 | |
818 | return 0; | |
819 | } | |
a48b2d4a FB |
820 | #endif |
821 | ||
65b0c038 MB |
822 | static SIMPLE_DEV_PM_OPS(lm8323_pm_ops, lm8323_suspend, lm8323_resume); |
823 | ||
a48b2d4a FB |
824 | static const struct i2c_device_id lm8323_id[] = { |
825 | { "lm8323", 0 }, | |
826 | { } | |
827 | }; | |
828 | ||
829 | static struct i2c_driver lm8323_i2c_driver = { | |
830 | .driver = { | |
831 | .name = "lm8323", | |
65b0c038 | 832 | .pm = &lm8323_pm_ops, |
a48b2d4a FB |
833 | }, |
834 | .probe = lm8323_probe, | |
1cb0aa88 | 835 | .remove = lm8323_remove, |
a48b2d4a FB |
836 | .id_table = lm8323_id, |
837 | }; | |
838 | MODULE_DEVICE_TABLE(i2c, lm8323_id); | |
839 | ||
1b92c1cf | 840 | module_i2c_driver(lm8323_i2c_driver); |
a48b2d4a FB |
841 | |
842 | MODULE_AUTHOR("Timo O. Karjalainen <timo.o.karjalainen@nokia.com>"); | |
843 | MODULE_AUTHOR("Daniel Stone"); | |
844 | MODULE_AUTHOR("Felipe Balbi <felipe.balbi@nokia.com>"); | |
845 | MODULE_DESCRIPTION("LM8323 keypad driver"); | |
846 | MODULE_LICENSE("GPL"); | |
847 |