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1 | /* |
2 | * drivers/i2c/chips/lm8323.c | |
3 | * | |
4 | * Copyright (C) 2007-2009 Nokia Corporation | |
5 | * | |
6 | * Written by Daniel Stone <daniel.stone@nokia.com> | |
7 | * Timo O. Karjalainen <timo.o.karjalainen@nokia.com> | |
8 | * | |
9 | * Updated by Felipe Balbi <felipe.balbi@nokia.com> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation (version 2 of the License only). | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
23 | */ | |
24 | ||
25 | #include <linux/module.h> | |
26 | #include <linux/i2c.h> | |
27 | #include <linux/interrupt.h> | |
28 | #include <linux/sched.h> | |
29 | #include <linux/mutex.h> | |
30 | #include <linux/delay.h> | |
31 | #include <linux/input.h> | |
32 | #include <linux/leds.h> | |
33 | #include <linux/i2c/lm8323.h> | |
34 | ||
35 | /* Commands to send to the chip. */ | |
36 | #define LM8323_CMD_READ_ID 0x80 /* Read chip ID. */ | |
37 | #define LM8323_CMD_WRITE_CFG 0x81 /* Set configuration item. */ | |
38 | #define LM8323_CMD_READ_INT 0x82 /* Get interrupt status. */ | |
39 | #define LM8323_CMD_RESET 0x83 /* Reset, same as external one */ | |
40 | #define LM8323_CMD_WRITE_PORT_SEL 0x85 /* Set GPIO in/out. */ | |
41 | #define LM8323_CMD_WRITE_PORT_STATE 0x86 /* Set GPIO pullup. */ | |
42 | #define LM8323_CMD_READ_PORT_SEL 0x87 /* Get GPIO in/out. */ | |
43 | #define LM8323_CMD_READ_PORT_STATE 0x88 /* Get GPIO pullup. */ | |
44 | #define LM8323_CMD_READ_FIFO 0x89 /* Read byte from FIFO. */ | |
45 | #define LM8323_CMD_RPT_READ_FIFO 0x8a /* Read FIFO (no increment). */ | |
46 | #define LM8323_CMD_SET_ACTIVE 0x8b /* Set active time. */ | |
47 | #define LM8323_CMD_READ_ERR 0x8c /* Get error status. */ | |
48 | #define LM8323_CMD_READ_ROTATOR 0x8e /* Read rotator status. */ | |
49 | #define LM8323_CMD_SET_DEBOUNCE 0x8f /* Set debouncing time. */ | |
50 | #define LM8323_CMD_SET_KEY_SIZE 0x90 /* Set keypad size. */ | |
51 | #define LM8323_CMD_READ_KEY_SIZE 0x91 /* Get keypad size. */ | |
52 | #define LM8323_CMD_READ_CFG 0x92 /* Get configuration item. */ | |
53 | #define LM8323_CMD_WRITE_CLOCK 0x93 /* Set clock config. */ | |
54 | #define LM8323_CMD_READ_CLOCK 0x94 /* Get clock config. */ | |
55 | #define LM8323_CMD_PWM_WRITE 0x95 /* Write PWM script. */ | |
56 | #define LM8323_CMD_START_PWM 0x96 /* Start PWM engine. */ | |
57 | #define LM8323_CMD_STOP_PWM 0x97 /* Stop PWM engine. */ | |
58 | ||
59 | /* Interrupt status. */ | |
60 | #define INT_KEYPAD 0x01 /* Key event. */ | |
61 | #define INT_ROTATOR 0x02 /* Rotator event. */ | |
62 | #define INT_ERROR 0x08 /* Error: use CMD_READ_ERR. */ | |
63 | #define INT_NOINIT 0x10 /* Lost configuration. */ | |
64 | #define INT_PWM1 0x20 /* PWM1 stopped. */ | |
65 | #define INT_PWM2 0x40 /* PWM2 stopped. */ | |
66 | #define INT_PWM3 0x80 /* PWM3 stopped. */ | |
67 | ||
68 | /* Errors (signalled by INT_ERROR, read with CMD_READ_ERR). */ | |
69 | #define ERR_BADPAR 0x01 /* Bad parameter. */ | |
70 | #define ERR_CMDUNK 0x02 /* Unknown command. */ | |
71 | #define ERR_KEYOVR 0x04 /* Too many keys pressed. */ | |
72 | #define ERR_FIFOOVER 0x40 /* FIFO overflow. */ | |
73 | ||
74 | /* Configuration keys (CMD_{WRITE,READ}_CFG). */ | |
75 | #define CFG_MUX1SEL 0x01 /* Select MUX1_OUT input. */ | |
76 | #define CFG_MUX1EN 0x02 /* Enable MUX1_OUT. */ | |
77 | #define CFG_MUX2SEL 0x04 /* Select MUX2_OUT input. */ | |
78 | #define CFG_MUX2EN 0x08 /* Enable MUX2_OUT. */ | |
79 | #define CFG_PSIZE 0x20 /* Package size (must be 0). */ | |
80 | #define CFG_ROTEN 0x40 /* Enable rotator. */ | |
81 | ||
82 | /* Clock settings (CMD_{WRITE,READ}_CLOCK). */ | |
83 | #define CLK_RCPWM_INTERNAL 0x00 | |
84 | #define CLK_RCPWM_EXTERNAL 0x03 | |
85 | #define CLK_SLOWCLKEN 0x08 /* Enable 32.768kHz clock. */ | |
86 | #define CLK_SLOWCLKOUT 0x40 /* Enable slow pulse output. */ | |
87 | ||
88 | /* The possible addresses corresponding to CONFIG1 and CONFIG2 pin wirings. */ | |
89 | #define LM8323_I2C_ADDR00 (0x84 >> 1) /* 1000 010x */ | |
90 | #define LM8323_I2C_ADDR01 (0x86 >> 1) /* 1000 011x */ | |
91 | #define LM8323_I2C_ADDR10 (0x88 >> 1) /* 1000 100x */ | |
92 | #define LM8323_I2C_ADDR11 (0x8A >> 1) /* 1000 101x */ | |
93 | ||
94 | /* Key event fifo length */ | |
95 | #define LM8323_FIFO_LEN 15 | |
96 | ||
97 | /* Commands for PWM engine; feed in with PWM_WRITE. */ | |
98 | /* Load ramp counter from duty cycle field (range 0 - 0xff). */ | |
99 | #define PWM_SET(v) (0x4000 | ((v) & 0xff)) | |
100 | /* Go to start of script. */ | |
101 | #define PWM_GOTOSTART 0x0000 | |
102 | /* | |
103 | * Stop engine (generates interrupt). If reset is 1, clear the program | |
104 | * counter, else leave it. | |
105 | */ | |
106 | #define PWM_END(reset) (0xc000 | (!!(reset) << 11)) | |
107 | /* | |
108 | * Ramp. If s is 1, divide clock by 512, else divide clock by 16. | |
109 | * Take t clock scales (up to 63) per step, for n steps (up to 126). | |
110 | * If u is set, ramp up, else ramp down. | |
111 | */ | |
112 | #define PWM_RAMP(s, t, n, u) ((!!(s) << 14) | ((t) & 0x3f) << 8 | \ | |
113 | ((n) & 0x7f) | ((u) ? 0 : 0x80)) | |
114 | /* | |
115 | * Loop (i.e. jump back to pos) for a given number of iterations (up to 63). | |
116 | * If cnt is zero, execute until PWM_END is encountered. | |
117 | */ | |
118 | #define PWM_LOOP(cnt, pos) (0xa000 | (((cnt) & 0x3f) << 7) | \ | |
119 | ((pos) & 0x3f)) | |
120 | /* | |
121 | * Wait for trigger. Argument is a mask of channels, shifted by the channel | |
122 | * number, e.g. 0xa for channels 3 and 1. Note that channels are numbered | |
123 | * from 1, not 0. | |
124 | */ | |
125 | #define PWM_WAIT_TRIG(chans) (0xe000 | (((chans) & 0x7) << 6)) | |
126 | /* Send trigger. Argument is same as PWM_WAIT_TRIG. */ | |
127 | #define PWM_SEND_TRIG(chans) (0xe000 | ((chans) & 0x7)) | |
128 | ||
129 | struct lm8323_pwm { | |
130 | int id; | |
131 | int fade_time; | |
132 | int brightness; | |
133 | int desired_brightness; | |
134 | bool enabled; | |
135 | bool running; | |
136 | /* pwm lock */ | |
137 | struct mutex lock; | |
138 | struct work_struct work; | |
139 | struct led_classdev cdev; | |
140 | struct lm8323_chip *chip; | |
141 | }; | |
142 | ||
143 | struct lm8323_chip { | |
144 | /* device lock */ | |
145 | struct mutex lock; | |
146 | struct i2c_client *client; | |
147 | struct work_struct work; | |
148 | struct input_dev *idev; | |
149 | bool kp_enabled; | |
150 | bool pm_suspend; | |
151 | unsigned keys_down; | |
152 | char phys[32]; | |
153 | unsigned short keymap[LM8323_KEYMAP_SIZE]; | |
154 | int size_x; | |
155 | int size_y; | |
156 | int debounce_time; | |
157 | int active_time; | |
158 | struct lm8323_pwm pwm[LM8323_NUM_PWMS]; | |
159 | }; | |
160 | ||
161 | #define client_to_lm8323(c) container_of(c, struct lm8323_chip, client) | |
162 | #define dev_to_lm8323(d) container_of(d, struct lm8323_chip, client->dev) | |
163 | #define work_to_lm8323(w) container_of(w, struct lm8323_chip, work) | |
164 | #define cdev_to_pwm(c) container_of(c, struct lm8323_pwm, cdev) | |
165 | #define work_to_pwm(w) container_of(w, struct lm8323_pwm, work) | |
166 | ||
167 | #define LM8323_MAX_DATA 8 | |
168 | ||
169 | /* | |
170 | * To write, we just access the chip's address in write mode, and dump the | |
171 | * command and data out on the bus. The command byte and data are taken as | |
172 | * sequential u8s out of varargs, to a maximum of LM8323_MAX_DATA. | |
173 | */ | |
174 | static int lm8323_write(struct lm8323_chip *lm, int len, ...) | |
175 | { | |
176 | int ret, i; | |
177 | va_list ap; | |
178 | u8 data[LM8323_MAX_DATA]; | |
179 | ||
180 | va_start(ap, len); | |
181 | ||
182 | if (unlikely(len > LM8323_MAX_DATA)) { | |
183 | dev_err(&lm->client->dev, "tried to send %d bytes\n", len); | |
184 | va_end(ap); | |
185 | return 0; | |
186 | } | |
187 | ||
188 | for (i = 0; i < len; i++) | |
189 | data[i] = va_arg(ap, int); | |
190 | ||
191 | va_end(ap); | |
192 | ||
193 | /* | |
194 | * If the host is asleep while we send the data, we can get a NACK | |
195 | * back while it wakes up, so try again, once. | |
196 | */ | |
197 | ret = i2c_master_send(lm->client, data, len); | |
198 | if (unlikely(ret == -EREMOTEIO)) | |
199 | ret = i2c_master_send(lm->client, data, len); | |
200 | if (unlikely(ret != len)) | |
201 | dev_err(&lm->client->dev, "sent %d bytes of %d total\n", | |
202 | len, ret); | |
203 | ||
204 | return ret; | |
205 | } | |
206 | ||
207 | /* | |
208 | * To read, we first send the command byte to the chip and end the transaction, | |
209 | * then access the chip in read mode, at which point it will send the data. | |
210 | */ | |
211 | static int lm8323_read(struct lm8323_chip *lm, u8 cmd, u8 *buf, int len) | |
212 | { | |
213 | int ret; | |
214 | ||
215 | /* | |
216 | * If the host is asleep while we send the byte, we can get a NACK | |
217 | * back while it wakes up, so try again, once. | |
218 | */ | |
219 | ret = i2c_master_send(lm->client, &cmd, 1); | |
220 | if (unlikely(ret == -EREMOTEIO)) | |
221 | ret = i2c_master_send(lm->client, &cmd, 1); | |
222 | if (unlikely(ret != 1)) { | |
223 | dev_err(&lm->client->dev, "sending read cmd 0x%02x failed\n", | |
224 | cmd); | |
225 | return 0; | |
226 | } | |
227 | ||
228 | ret = i2c_master_recv(lm->client, buf, len); | |
229 | if (unlikely(ret != len)) | |
230 | dev_err(&lm->client->dev, "wanted %d bytes, got %d\n", | |
231 | len, ret); | |
232 | ||
233 | return ret; | |
234 | } | |
235 | ||
236 | /* | |
237 | * Set the chip active time (idle time before it enters halt). | |
238 | */ | |
239 | static void lm8323_set_active_time(struct lm8323_chip *lm, int time) | |
240 | { | |
241 | lm8323_write(lm, 2, LM8323_CMD_SET_ACTIVE, time >> 2); | |
242 | } | |
243 | ||
244 | /* | |
245 | * The signals are AT-style: the low 7 bits are the keycode, and the top | |
246 | * bit indicates the state (1 for down, 0 for up). | |
247 | */ | |
248 | static inline u8 lm8323_whichkey(u8 event) | |
249 | { | |
250 | return event & 0x7f; | |
251 | } | |
252 | ||
253 | static inline int lm8323_ispress(u8 event) | |
254 | { | |
255 | return (event & 0x80) ? 1 : 0; | |
256 | } | |
257 | ||
258 | static void process_keys(struct lm8323_chip *lm) | |
259 | { | |
260 | u8 event; | |
261 | u8 key_fifo[LM8323_FIFO_LEN + 1]; | |
262 | int old_keys_down = lm->keys_down; | |
263 | int ret; | |
264 | int i = 0; | |
265 | ||
266 | /* | |
267 | * Read all key events from the FIFO at once. Next READ_FIFO clears the | |
268 | * FIFO even if we didn't read all events previously. | |
269 | */ | |
270 | ret = lm8323_read(lm, LM8323_CMD_READ_FIFO, key_fifo, LM8323_FIFO_LEN); | |
271 | ||
272 | if (ret < 0) { | |
273 | dev_err(&lm->client->dev, "Failed reading fifo \n"); | |
274 | return; | |
275 | } | |
276 | key_fifo[ret] = 0; | |
277 | ||
278 | while ((event = key_fifo[i++])) { | |
279 | u8 key = lm8323_whichkey(event); | |
280 | int isdown = lm8323_ispress(event); | |
281 | unsigned short keycode = lm->keymap[key]; | |
282 | ||
283 | dev_vdbg(&lm->client->dev, "key 0x%02x %s\n", | |
284 | key, isdown ? "down" : "up"); | |
285 | ||
286 | if (lm->kp_enabled) { | |
287 | input_event(lm->idev, EV_MSC, MSC_SCAN, key); | |
288 | input_report_key(lm->idev, keycode, isdown); | |
289 | input_sync(lm->idev); | |
290 | } | |
291 | ||
292 | if (isdown) | |
293 | lm->keys_down++; | |
294 | else | |
295 | lm->keys_down--; | |
296 | } | |
297 | ||
298 | /* | |
299 | * Errata: We need to ensure that the chip never enters halt mode | |
300 | * during a keypress, so set active time to 0. When it's released, | |
301 | * we can enter halt again, so set the active time back to normal. | |
302 | */ | |
303 | if (!old_keys_down && lm->keys_down) | |
304 | lm8323_set_active_time(lm, 0); | |
305 | if (old_keys_down && !lm->keys_down) | |
306 | lm8323_set_active_time(lm, lm->active_time); | |
307 | } | |
308 | ||
309 | static void lm8323_process_error(struct lm8323_chip *lm) | |
310 | { | |
311 | u8 error; | |
312 | ||
313 | if (lm8323_read(lm, LM8323_CMD_READ_ERR, &error, 1) == 1) { | |
314 | if (error & ERR_FIFOOVER) | |
315 | dev_vdbg(&lm->client->dev, "fifo overflow!\n"); | |
316 | if (error & ERR_KEYOVR) | |
317 | dev_vdbg(&lm->client->dev, | |
318 | "more than two keys pressed\n"); | |
319 | if (error & ERR_CMDUNK) | |
320 | dev_vdbg(&lm->client->dev, | |
321 | "unknown command submitted\n"); | |
322 | if (error & ERR_BADPAR) | |
323 | dev_vdbg(&lm->client->dev, "bad command parameter\n"); | |
324 | } | |
325 | } | |
326 | ||
327 | static void lm8323_reset(struct lm8323_chip *lm) | |
328 | { | |
329 | /* The docs say we must pass 0xAA as the data byte. */ | |
330 | lm8323_write(lm, 2, LM8323_CMD_RESET, 0xAA); | |
331 | } | |
332 | ||
333 | static int lm8323_configure(struct lm8323_chip *lm) | |
334 | { | |
335 | int keysize = (lm->size_x << 4) | lm->size_y; | |
336 | int clock = (CLK_SLOWCLKEN | CLK_RCPWM_EXTERNAL); | |
337 | int debounce = lm->debounce_time >> 2; | |
338 | int active = lm->active_time >> 2; | |
339 | ||
340 | /* | |
341 | * Active time must be greater than the debounce time: if it's | |
342 | * a close-run thing, give ourselves a 12ms buffer. | |
343 | */ | |
344 | if (debounce >= active) | |
345 | active = debounce + 3; | |
346 | ||
347 | lm8323_write(lm, 2, LM8323_CMD_WRITE_CFG, 0); | |
348 | lm8323_write(lm, 2, LM8323_CMD_WRITE_CLOCK, clock); | |
349 | lm8323_write(lm, 2, LM8323_CMD_SET_KEY_SIZE, keysize); | |
350 | lm8323_set_active_time(lm, lm->active_time); | |
351 | lm8323_write(lm, 2, LM8323_CMD_SET_DEBOUNCE, debounce); | |
352 | lm8323_write(lm, 3, LM8323_CMD_WRITE_PORT_STATE, 0xff, 0xff); | |
353 | lm8323_write(lm, 3, LM8323_CMD_WRITE_PORT_SEL, 0, 0); | |
354 | ||
355 | /* | |
356 | * Not much we can do about errors at this point, so just hope | |
357 | * for the best. | |
358 | */ | |
359 | ||
360 | return 0; | |
361 | } | |
362 | ||
363 | static void pwm_done(struct lm8323_pwm *pwm) | |
364 | { | |
365 | mutex_lock(&pwm->lock); | |
366 | pwm->running = false; | |
367 | if (pwm->desired_brightness != pwm->brightness) | |
368 | schedule_work(&pwm->work); | |
369 | mutex_unlock(&pwm->lock); | |
370 | } | |
371 | ||
372 | /* | |
373 | * Bottom half: handle the interrupt by posting key events, or dealing with | |
374 | * errors appropriately. | |
375 | */ | |
376 | static void lm8323_work(struct work_struct *work) | |
377 | { | |
378 | struct lm8323_chip *lm = work_to_lm8323(work); | |
379 | u8 ints; | |
380 | int i; | |
381 | ||
382 | mutex_lock(&lm->lock); | |
383 | ||
384 | while ((lm8323_read(lm, LM8323_CMD_READ_INT, &ints, 1) == 1) && ints) { | |
385 | if (likely(ints & INT_KEYPAD)) | |
386 | process_keys(lm); | |
387 | if (ints & INT_ROTATOR) { | |
388 | /* We don't currently support the rotator. */ | |
389 | dev_vdbg(&lm->client->dev, "rotator fired\n"); | |
390 | } | |
391 | if (ints & INT_ERROR) { | |
392 | dev_vdbg(&lm->client->dev, "error!\n"); | |
393 | lm8323_process_error(lm); | |
394 | } | |
395 | if (ints & INT_NOINIT) { | |
396 | dev_err(&lm->client->dev, "chip lost config; " | |
397 | "reinitialising\n"); | |
398 | lm8323_configure(lm); | |
399 | } | |
400 | for (i = 0; i < LM8323_NUM_PWMS; i++) { | |
401 | if (ints & (1 << (INT_PWM1 + i))) { | |
402 | dev_vdbg(&lm->client->dev, | |
403 | "pwm%d engine completed\n", i); | |
404 | pwm_done(&lm->pwm[i]); | |
405 | } | |
406 | } | |
407 | } | |
408 | ||
409 | mutex_unlock(&lm->lock); | |
410 | } | |
411 | ||
412 | /* | |
413 | * We cannot use I2C in interrupt context, so we just schedule work. | |
414 | */ | |
415 | static irqreturn_t lm8323_irq(int irq, void *data) | |
416 | { | |
417 | struct lm8323_chip *lm = data; | |
418 | ||
419 | schedule_work(&lm->work); | |
420 | ||
421 | return IRQ_HANDLED; | |
422 | } | |
423 | ||
424 | /* | |
425 | * Read the chip ID. | |
426 | */ | |
427 | static int lm8323_read_id(struct lm8323_chip *lm, u8 *buf) | |
428 | { | |
429 | int bytes; | |
430 | ||
431 | bytes = lm8323_read(lm, LM8323_CMD_READ_ID, buf, 2); | |
432 | if (unlikely(bytes != 2)) | |
433 | return -EIO; | |
434 | ||
435 | return 0; | |
436 | } | |
437 | ||
438 | static void lm8323_write_pwm_one(struct lm8323_pwm *pwm, int pos, u16 cmd) | |
439 | { | |
440 | lm8323_write(pwm->chip, 4, LM8323_CMD_PWM_WRITE, (pos << 2) | pwm->id, | |
441 | (cmd & 0xff00) >> 8, cmd & 0x00ff); | |
442 | } | |
443 | ||
444 | /* | |
445 | * Write a script into a given PWM engine, concluding with PWM_END. | |
446 | * If 'kill' is nonzero, the engine will be shut down at the end | |
447 | * of the script, producing a zero output. Otherwise the engine | |
448 | * will be kept running at the final PWM level indefinitely. | |
449 | */ | |
450 | static void lm8323_write_pwm(struct lm8323_pwm *pwm, int kill, | |
451 | int len, const u16 *cmds) | |
452 | { | |
453 | int i; | |
454 | ||
455 | for (i = 0; i < len; i++) | |
456 | lm8323_write_pwm_one(pwm, i, cmds[i]); | |
457 | ||
458 | lm8323_write_pwm_one(pwm, i++, PWM_END(kill)); | |
459 | lm8323_write(pwm->chip, 2, LM8323_CMD_START_PWM, pwm->id); | |
460 | pwm->running = true; | |
461 | } | |
462 | ||
463 | static void lm8323_pwm_work(struct work_struct *work) | |
464 | { | |
465 | struct lm8323_pwm *pwm = work_to_pwm(work); | |
466 | int div512, perstep, steps, hz, up, kill; | |
467 | u16 pwm_cmds[3]; | |
468 | int num_cmds = 0; | |
469 | ||
470 | mutex_lock(&pwm->lock); | |
471 | ||
472 | /* | |
473 | * Do nothing if we're already at the requested level, | |
474 | * or previous setting is not yet complete. In the latter | |
475 | * case we will be called again when the previous PWM script | |
476 | * finishes. | |
477 | */ | |
478 | if (pwm->running || pwm->desired_brightness == pwm->brightness) | |
479 | goto out; | |
480 | ||
481 | kill = (pwm->desired_brightness == 0); | |
482 | up = (pwm->desired_brightness > pwm->brightness); | |
483 | steps = abs(pwm->desired_brightness - pwm->brightness); | |
484 | ||
485 | /* | |
486 | * Convert time (in ms) into a divisor (512 or 16 on a refclk of | |
487 | * 32768Hz), and number of ticks per step. | |
488 | */ | |
489 | if ((pwm->fade_time / steps) > (32768 / 512)) { | |
490 | div512 = 1; | |
491 | hz = 32768 / 512; | |
492 | } else { | |
493 | div512 = 0; | |
494 | hz = 32768 / 16; | |
495 | } | |
496 | ||
497 | perstep = (hz * pwm->fade_time) / (steps * 1000); | |
498 | ||
499 | if (perstep == 0) | |
500 | perstep = 1; | |
501 | else if (perstep > 63) | |
502 | perstep = 63; | |
503 | ||
504 | while (steps) { | |
505 | int s; | |
506 | ||
507 | s = min(126, steps); | |
508 | pwm_cmds[num_cmds++] = PWM_RAMP(div512, perstep, s, up); | |
509 | steps -= s; | |
510 | } | |
511 | ||
512 | lm8323_write_pwm(pwm, kill, num_cmds, pwm_cmds); | |
513 | pwm->brightness = pwm->desired_brightness; | |
514 | ||
515 | out: | |
516 | mutex_unlock(&pwm->lock); | |
517 | } | |
518 | ||
519 | static void lm8323_pwm_set_brightness(struct led_classdev *led_cdev, | |
520 | enum led_brightness brightness) | |
521 | { | |
522 | struct lm8323_pwm *pwm = cdev_to_pwm(led_cdev); | |
523 | struct lm8323_chip *lm = pwm->chip; | |
524 | ||
525 | mutex_lock(&pwm->lock); | |
526 | pwm->desired_brightness = brightness; | |
527 | mutex_unlock(&pwm->lock); | |
528 | ||
529 | if (in_interrupt()) { | |
530 | schedule_work(&pwm->work); | |
531 | } else { | |
532 | /* | |
533 | * Schedule PWM work as usual unless we are going into suspend | |
534 | */ | |
535 | mutex_lock(&lm->lock); | |
536 | if (likely(!lm->pm_suspend)) | |
537 | schedule_work(&pwm->work); | |
538 | else | |
539 | lm8323_pwm_work(&pwm->work); | |
540 | mutex_unlock(&lm->lock); | |
541 | } | |
542 | } | |
543 | ||
544 | static ssize_t lm8323_pwm_show_time(struct device *dev, | |
545 | struct device_attribute *attr, char *buf) | |
546 | { | |
547 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
548 | struct lm8323_pwm *pwm = cdev_to_pwm(led_cdev); | |
549 | ||
550 | return sprintf(buf, "%d\n", pwm->fade_time); | |
551 | } | |
552 | ||
553 | static ssize_t lm8323_pwm_store_time(struct device *dev, | |
554 | struct device_attribute *attr, const char *buf, size_t len) | |
555 | { | |
556 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
557 | struct lm8323_pwm *pwm = cdev_to_pwm(led_cdev); | |
558 | int ret; | |
559 | unsigned long time; | |
560 | ||
561 | ret = strict_strtoul(buf, 10, &time); | |
562 | /* Numbers only, please. */ | |
563 | if (ret) | |
564 | return -EINVAL; | |
565 | ||
566 | pwm->fade_time = time; | |
567 | ||
568 | return strlen(buf); | |
569 | } | |
570 | static DEVICE_ATTR(time, 0644, lm8323_pwm_show_time, lm8323_pwm_store_time); | |
571 | ||
572 | static int init_pwm(struct lm8323_chip *lm, int id, struct device *dev, | |
573 | const char *name) | |
574 | { | |
575 | struct lm8323_pwm *pwm; | |
576 | ||
577 | BUG_ON(id > 3); | |
578 | ||
579 | pwm = &lm->pwm[id - 1]; | |
580 | ||
581 | pwm->id = id; | |
582 | pwm->fade_time = 0; | |
583 | pwm->brightness = 0; | |
584 | pwm->desired_brightness = 0; | |
585 | pwm->running = false; | |
586 | pwm->enabled = false; | |
587 | INIT_WORK(&pwm->work, lm8323_pwm_work); | |
588 | mutex_init(&pwm->lock); | |
589 | pwm->chip = lm; | |
590 | ||
591 | if (name) { | |
592 | pwm->cdev.name = name; | |
593 | pwm->cdev.brightness_set = lm8323_pwm_set_brightness; | |
594 | if (led_classdev_register(dev, &pwm->cdev) < 0) { | |
595 | dev_err(dev, "couldn't register PWM %d\n", id); | |
596 | return -1; | |
597 | } | |
598 | if (device_create_file(pwm->cdev.dev, | |
599 | &dev_attr_time) < 0) { | |
600 | dev_err(dev, "couldn't register time attribute\n"); | |
601 | led_classdev_unregister(&pwm->cdev); | |
602 | return -1; | |
603 | } | |
604 | pwm->enabled = true; | |
605 | } | |
606 | ||
607 | return 0; | |
608 | } | |
609 | ||
610 | static struct i2c_driver lm8323_i2c_driver; | |
611 | ||
612 | static ssize_t lm8323_show_disable(struct device *dev, | |
613 | struct device_attribute *attr, char *buf) | |
614 | { | |
615 | struct lm8323_chip *lm = dev_get_drvdata(dev); | |
616 | ||
617 | return sprintf(buf, "%u\n", !lm->kp_enabled); | |
618 | } | |
619 | ||
620 | static ssize_t lm8323_set_disable(struct device *dev, | |
621 | struct device_attribute *attr, | |
622 | const char *buf, size_t count) | |
623 | { | |
624 | struct lm8323_chip *lm = dev_get_drvdata(dev); | |
625 | int ret; | |
626 | unsigned long i; | |
627 | ||
628 | ret = strict_strtoul(buf, 10, &i); | |
629 | ||
630 | mutex_lock(&lm->lock); | |
631 | lm->kp_enabled = !i; | |
632 | mutex_unlock(&lm->lock); | |
633 | ||
634 | return count; | |
635 | } | |
636 | static DEVICE_ATTR(disable_kp, 0644, lm8323_show_disable, lm8323_set_disable); | |
637 | ||
638 | static int __devinit lm8323_probe(struct i2c_client *client, | |
639 | const struct i2c_device_id *id) | |
640 | { | |
641 | struct lm8323_platform_data *pdata = client->dev.platform_data; | |
642 | struct input_dev *idev; | |
643 | struct lm8323_chip *lm; | |
644 | int i, err; | |
645 | unsigned long tmo; | |
646 | u8 data[2]; | |
647 | ||
648 | if (!pdata || !pdata->size_x || !pdata->size_y) { | |
649 | dev_err(&client->dev, "missing platform_data\n"); | |
650 | return -EINVAL; | |
651 | } | |
652 | ||
653 | if (pdata->size_x > 8) { | |
654 | dev_err(&client->dev, "invalid x size %d specified\n", | |
655 | pdata->size_x); | |
656 | return -EINVAL; | |
657 | } | |
658 | ||
659 | if (pdata->size_y > 12) { | |
660 | dev_err(&client->dev, "invalid y size %d specified\n", | |
661 | pdata->size_y); | |
662 | return -EINVAL; | |
663 | } | |
664 | ||
665 | lm = kzalloc(sizeof *lm, GFP_KERNEL); | |
666 | idev = input_allocate_device(); | |
667 | if (!lm || !idev) { | |
668 | err = -ENOMEM; | |
669 | goto fail1; | |
670 | } | |
671 | ||
672 | i2c_set_clientdata(client, lm); | |
673 | ||
674 | lm->client = client; | |
675 | lm->idev = idev; | |
676 | mutex_init(&lm->lock); | |
677 | INIT_WORK(&lm->work, lm8323_work); | |
678 | ||
679 | lm->size_x = pdata->size_x; | |
680 | lm->size_y = pdata->size_y; | |
681 | dev_vdbg(&client->dev, "Keypad size: %d x %d\n", | |
682 | lm->size_x, lm->size_y); | |
683 | ||
684 | lm->debounce_time = pdata->debounce_time; | |
685 | lm->active_time = pdata->active_time; | |
686 | ||
687 | lm8323_reset(lm); | |
688 | ||
689 | /* Nothing's set up to service the IRQ yet, so just spin for max. | |
690 | * 100ms until we can configure. */ | |
691 | tmo = jiffies + msecs_to_jiffies(100); | |
692 | while (lm8323_read(lm, LM8323_CMD_READ_INT, data, 1) == 1) { | |
693 | if (data[0] & INT_NOINIT) | |
694 | break; | |
695 | ||
696 | if (time_after(jiffies, tmo)) { | |
697 | dev_err(&client->dev, | |
698 | "timeout waiting for initialisation\n"); | |
699 | break; | |
700 | } | |
701 | ||
702 | msleep(1); | |
703 | } | |
704 | ||
705 | lm8323_configure(lm); | |
706 | ||
707 | /* If a true probe check the device */ | |
708 | if (lm8323_read_id(lm, data) != 0) { | |
709 | dev_err(&client->dev, "device not found\n"); | |
710 | err = -ENODEV; | |
711 | goto fail1; | |
712 | } | |
713 | ||
714 | for (i = 0; i < LM8323_NUM_PWMS; i++) { | |
715 | err = init_pwm(lm, i + 1, &client->dev, pdata->pwm_names[i]); | |
716 | if (err < 0) | |
717 | goto fail2; | |
718 | } | |
719 | ||
720 | lm->kp_enabled = true; | |
721 | err = device_create_file(&client->dev, &dev_attr_disable_kp); | |
722 | if (err < 0) | |
723 | goto fail2; | |
724 | ||
725 | idev->name = pdata->name ? : "LM8323 keypad"; | |
726 | snprintf(lm->phys, sizeof(lm->phys), | |
727 | "%s/input-kp", dev_name(&client->dev)); | |
728 | idev->phys = lm->phys; | |
729 | ||
730 | idev->evbit[0] = BIT(EV_KEY) | BIT(EV_MSC); | |
731 | __set_bit(MSC_SCAN, idev->mscbit); | |
732 | for (i = 0; i < LM8323_KEYMAP_SIZE; i++) { | |
733 | __set_bit(pdata->keymap[i], idev->keybit); | |
734 | lm->keymap[i] = pdata->keymap[i]; | |
735 | } | |
736 | __clear_bit(KEY_RESERVED, idev->keybit); | |
737 | ||
738 | if (pdata->repeat) | |
739 | __set_bit(EV_REP, idev->evbit); | |
740 | ||
741 | err = input_register_device(idev); | |
742 | if (err) { | |
743 | dev_dbg(&client->dev, "error registering input device\n"); | |
744 | goto fail3; | |
745 | } | |
746 | ||
747 | err = request_irq(client->irq, lm8323_irq, | |
748 | IRQF_TRIGGER_FALLING | IRQF_DISABLED, | |
749 | "lm8323", lm); | |
750 | if (err) { | |
751 | dev_err(&client->dev, "could not get IRQ %d\n", client->irq); | |
752 | goto fail4; | |
753 | } | |
754 | ||
755 | device_init_wakeup(&client->dev, 1); | |
756 | enable_irq_wake(client->irq); | |
757 | ||
758 | return 0; | |
759 | ||
760 | fail4: | |
761 | input_unregister_device(idev); | |
762 | idev = NULL; | |
763 | fail3: | |
764 | device_remove_file(&client->dev, &dev_attr_disable_kp); | |
765 | fail2: | |
766 | while (--i >= 0) | |
767 | if (lm->pwm[i].enabled) | |
768 | led_classdev_unregister(&lm->pwm[i].cdev); | |
769 | fail1: | |
770 | input_free_device(idev); | |
771 | kfree(lm); | |
772 | return err; | |
773 | } | |
774 | ||
775 | static int __devexit lm8323_remove(struct i2c_client *client) | |
776 | { | |
777 | struct lm8323_chip *lm = i2c_get_clientdata(client); | |
778 | int i; | |
779 | ||
780 | disable_irq_wake(client->irq); | |
781 | free_irq(client->irq, lm); | |
782 | cancel_work_sync(&lm->work); | |
783 | ||
784 | input_unregister_device(lm->idev); | |
785 | ||
786 | device_remove_file(&lm->client->dev, &dev_attr_disable_kp); | |
787 | ||
788 | for (i = 0; i < 3; i++) | |
789 | if (lm->pwm[i].enabled) | |
790 | led_classdev_unregister(&lm->pwm[i].cdev); | |
791 | ||
792 | kfree(lm); | |
793 | ||
794 | return 0; | |
795 | } | |
796 | ||
797 | #ifdef CONFIG_PM | |
798 | /* | |
799 | * We don't need to explicitly suspend the chip, as it already switches off | |
800 | * when there's no activity. | |
801 | */ | |
802 | static int lm8323_suspend(struct i2c_client *client, pm_message_t mesg) | |
803 | { | |
804 | struct lm8323_chip *lm = i2c_get_clientdata(client); | |
805 | int i; | |
806 | ||
807 | set_irq_wake(client->irq, 0); | |
808 | disable_irq(client->irq); | |
809 | ||
810 | mutex_lock(&lm->lock); | |
811 | lm->pm_suspend = true; | |
812 | mutex_unlock(&lm->lock); | |
813 | ||
814 | for (i = 0; i < 3; i++) | |
815 | if (lm->pwm[i].enabled) | |
816 | led_classdev_suspend(&lm->pwm[i].cdev); | |
817 | ||
818 | return 0; | |
819 | } | |
820 | ||
821 | static int lm8323_resume(struct i2c_client *client) | |
822 | { | |
823 | struct lm8323_chip *lm = i2c_get_clientdata(client); | |
824 | int i; | |
825 | ||
826 | mutex_lock(&lm->lock); | |
827 | lm->pm_suspend = false; | |
828 | mutex_unlock(&lm->lock); | |
829 | ||
830 | for (i = 0; i < 3; i++) | |
831 | if (lm->pwm[i].enabled) | |
832 | led_classdev_resume(&lm->pwm[i].cdev); | |
833 | ||
834 | enable_irq(client->irq); | |
835 | set_irq_wake(client->irq, 1); | |
836 | ||
837 | return 0; | |
838 | } | |
839 | #else | |
840 | #define lm8323_suspend NULL | |
841 | #define lm8323_resume NULL | |
842 | #endif | |
843 | ||
844 | static const struct i2c_device_id lm8323_id[] = { | |
845 | { "lm8323", 0 }, | |
846 | { } | |
847 | }; | |
848 | ||
849 | static struct i2c_driver lm8323_i2c_driver = { | |
850 | .driver = { | |
851 | .name = "lm8323", | |
852 | }, | |
853 | .probe = lm8323_probe, | |
854 | .remove = __devexit_p(lm8323_remove), | |
855 | .suspend = lm8323_suspend, | |
856 | .resume = lm8323_resume, | |
857 | .id_table = lm8323_id, | |
858 | }; | |
859 | MODULE_DEVICE_TABLE(i2c, lm8323_id); | |
860 | ||
861 | static int __init lm8323_init(void) | |
862 | { | |
863 | return i2c_add_driver(&lm8323_i2c_driver); | |
864 | } | |
865 | module_init(lm8323_init); | |
866 | ||
867 | static void __exit lm8323_exit(void) | |
868 | { | |
869 | i2c_del_driver(&lm8323_i2c_driver); | |
870 | } | |
871 | module_exit(lm8323_exit); | |
872 | ||
873 | MODULE_AUTHOR("Timo O. Karjalainen <timo.o.karjalainen@nokia.com>"); | |
874 | MODULE_AUTHOR("Daniel Stone"); | |
875 | MODULE_AUTHOR("Felipe Balbi <felipe.balbi@nokia.com>"); | |
876 | MODULE_DESCRIPTION("LM8323 keypad driver"); | |
877 | MODULE_LICENSE("GPL"); | |
878 |