2 * drivers/i2c/chips/lm8323.c
4 * Copyright (C) 2007-2009 Nokia Corporation
6 * Written by Daniel Stone <daniel.stone@nokia.com>
7 * Timo O. Karjalainen <timo.o.karjalainen@nokia.com>
9 * Updated by Felipe Balbi <felipe.balbi@nokia.com>
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).
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.
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
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>
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. */
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. */
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. */
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. */
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. */
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 */
94 /* Key event fifo length */
95 #define LM8323_FIFO_LEN 15
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
103 * Stop engine (generates interrupt). If reset is 1, clear the program
104 * counter, else leave it.
106 #define PWM_END(reset) (0xc000 | (!!(reset) << 11))
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.
112 #define PWM_RAMP(s, t, n, u) ((!!(s) << 14) | ((t) & 0x3f) << 8 | \
113 ((n) & 0x7f) | ((u) ? 0 : 0x80))
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.
118 #define PWM_LOOP(cnt, pos) (0xa000 | (((cnt) & 0x3f) << 7) | \
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
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))
134 int desired_brightness;
138 struct work_struct work;
139 struct led_classdev cdev;
145 struct i2c_client *client;
146 struct work_struct work;
147 struct input_dev *idev;
148 unsigned kp_enabled:1;
149 unsigned pm_suspend:1;
152 s16 keymap[LM8323_KEYMAP_SIZE];
157 struct lm8323_pwm pwm1;
158 struct lm8323_pwm pwm2;
159 struct lm8323_pwm pwm3;
162 #define client_to_lm8323(c) container_of(c, struct lm8323_chip, client)
163 #define dev_to_lm8323(d) container_of(d, struct lm8323_chip, client->dev)
164 #define work_to_lm8323(w) container_of(w, struct lm8323_chip, work)
165 #define cdev_to_pwm(c) container_of(c, struct lm8323_pwm, cdev)
166 #define work_to_pwm(w) container_of(w, struct lm8323_pwm, work)
168 static struct lm8323_chip *pwm_to_lm8323(struct lm8323_pwm *pwm)
172 return container_of(pwm, struct lm8323_chip, pwm1);
174 return container_of(pwm, struct lm8323_chip, pwm2);
176 return container_of(pwm, struct lm8323_chip, pwm3);
182 #define LM8323_MAX_DATA 8
185 * To write, we just access the chip's address in write mode, and dump the
186 * command and data out on the bus. The command byte and data are taken as
187 * sequential u8s out of varargs, to a maximum of LM8323_MAX_DATA.
189 static int lm8323_write(struct lm8323_chip *lm, int len, ...)
193 u8 data[LM8323_MAX_DATA];
197 if (unlikely(len > LM8323_MAX_DATA)) {
198 dev_err(&lm->client->dev, "tried to send %d bytes\n", len);
203 for (i = 0; i < len; i++)
204 data[i] = va_arg(ap, int);
209 * If the host is asleep while we send the data, we can get a NACK
210 * back while it wakes up, so try again, once.
212 ret = i2c_master_send(lm->client, data, len);
213 if (unlikely(ret == -EREMOTEIO))
214 ret = i2c_master_send(lm->client, data, len);
215 if (unlikely(ret != len))
216 dev_err(&lm->client->dev, "sent %d bytes of %d total\n",
223 * To read, we first send the command byte to the chip and end the transaction,
224 * then access the chip in read mode, at which point it will send the data.
226 static int lm8323_read(struct lm8323_chip *lm, u8 cmd, u8 *buf, int len)
231 * If the host is asleep while we send the byte, we can get a NACK
232 * back while it wakes up, so try again, once.
234 ret = i2c_master_send(lm->client, &cmd, 1);
235 if (unlikely(ret == -EREMOTEIO))
236 ret = i2c_master_send(lm->client, &cmd, 1);
237 if (unlikely(ret != 1)) {
238 dev_err(&lm->client->dev, "sending read cmd 0x%02x failed\n",
243 ret = i2c_master_recv(lm->client, buf, len);
244 if (unlikely(ret != len))
245 dev_err(&lm->client->dev, "wanted %d bytes, got %d\n",
252 * Set the chip active time (idle time before it enters halt).
254 static void lm8323_set_active_time(struct lm8323_chip *lm, int time)
256 lm8323_write(lm, 2, LM8323_CMD_SET_ACTIVE, time >> 2);
260 * The signals are AT-style: the low 7 bits are the keycode, and the top
261 * bit indicates the state (1 for down, 0 for up).
263 static inline u8 lm8323_whichkey(u8 event)
268 static inline int lm8323_ispress(u8 event)
270 return (event & 0x80) ? 1 : 0;
273 static void process_keys(struct lm8323_chip *lm)
276 u8 key_fifo[LM8323_FIFO_LEN + 1];
277 int old_keys_down = lm->keys_down;
282 * Read all key events from the FIFO at once. Next READ_FIFO clears the
283 * FIFO even if we didn't read all events previously.
285 ret = lm8323_read(lm, LM8323_CMD_READ_FIFO, key_fifo, LM8323_FIFO_LEN);
288 dev_err(&lm->client->dev, "Failed reading fifo \n");
293 while ((event = key_fifo[i])) {
294 u8 key = lm8323_whichkey(event);
295 int isdown = lm8323_ispress(event);
296 s16 keycode = lm->keymap[key];
298 if (likely(keycode > 0)) {
299 dev_vdbg(&lm->client->dev, "key 0x%02x %s\n", key,
300 isdown ? "down" : "up");
301 if (likely(lm->kp_enabled)) {
302 input_report_key(lm->idev, keycode, isdown);
303 input_sync(lm->idev);
310 dev_err(&lm->client->dev, "keycode 0x%02x not mapped "
311 "to any key\n", key);
317 * Errata: We need to ensure that the chip never enters halt mode
318 * during a keypress, so set active time to 0. When it's released,
319 * we can enter halt again, so set the active time back to normal.
321 if (!old_keys_down && lm->keys_down)
322 lm8323_set_active_time(lm, 0);
323 if (old_keys_down && !lm->keys_down)
324 lm8323_set_active_time(lm, lm->active_time);
327 static void lm8323_process_error(struct lm8323_chip *lm)
331 if (lm8323_read(lm, LM8323_CMD_READ_ERR, &error, 1) == 1) {
332 if (error & ERR_FIFOOVER)
333 dev_vdbg(&lm->client->dev, "fifo overflow!\n");
334 if (error & ERR_KEYOVR)
335 dev_vdbg(&lm->client->dev,
336 "more than two keys pressed\n");
337 if (error & ERR_CMDUNK)
338 dev_vdbg(&lm->client->dev,
339 "unknown command submitted\n");
340 if (error & ERR_BADPAR)
341 dev_vdbg(&lm->client->dev, "bad command parameter\n");
345 static void lm8323_reset(struct lm8323_chip *lm)
347 /* The docs say we must pass 0xAA as the data byte. */
348 lm8323_write(lm, 2, LM8323_CMD_RESET, 0xAA);
351 static int lm8323_configure(struct lm8323_chip *lm)
353 int keysize = (lm->size_x << 4) | lm->size_y;
354 int clock = (CLK_SLOWCLKEN | CLK_RCPWM_EXTERNAL);
355 int debounce = lm->debounce_time >> 2;
356 int active = lm->active_time >> 2;
359 * Active time must be greater than the debounce time: if it's
360 * a close-run thing, give ourselves a 12ms buffer.
362 if (debounce >= active)
363 active = debounce + 3;
365 lm8323_write(lm, 2, LM8323_CMD_WRITE_CFG, 0);
366 lm8323_write(lm, 2, LM8323_CMD_WRITE_CLOCK, clock);
367 lm8323_write(lm, 2, LM8323_CMD_SET_KEY_SIZE, keysize);
368 lm8323_set_active_time(lm, lm->active_time);
369 lm8323_write(lm, 2, LM8323_CMD_SET_DEBOUNCE, debounce);
370 lm8323_write(lm, 3, LM8323_CMD_WRITE_PORT_STATE, 0xff, 0xff);
371 lm8323_write(lm, 3, LM8323_CMD_WRITE_PORT_SEL, 0, 0);
374 * Not much we can do about errors at this point, so just hope
381 static void pwm_done(struct lm8323_pwm *pwm)
383 mutex_lock(&pwm->lock);
385 if (pwm->desired_brightness != pwm->brightness)
386 schedule_work(&pwm->work);
387 mutex_unlock(&pwm->lock);
391 * Bottom half: handle the interrupt by posting key events, or dealing with
392 * errors appropriately.
394 static void lm8323_work(struct work_struct *work)
396 struct lm8323_chip *lm = work_to_lm8323(work);
399 mutex_lock(&lm->lock);
401 while ((lm8323_read(lm, LM8323_CMD_READ_INT, &ints, 1) == 1) && ints) {
402 if (likely(ints & INT_KEYPAD))
404 if (ints & INT_ROTATOR) {
405 /* We don't currently support the rotator. */
406 dev_vdbg(&lm->client->dev, "rotator fired\n");
408 if (ints & INT_ERROR) {
409 dev_vdbg(&lm->client->dev, "error!\n");
410 lm8323_process_error(lm);
412 if (ints & INT_NOINIT) {
413 dev_err(&lm->client->dev, "chip lost config; "
415 lm8323_configure(lm);
417 if (ints & INT_PWM1) {
418 dev_vdbg(&lm->client->dev, "pwm1 engine completed\n");
421 if (ints & INT_PWM2) {
422 dev_vdbg(&lm->client->dev, "pwm2 engine completed\n");
425 if (ints & INT_PWM3) {
426 dev_vdbg(&lm->client->dev, "pwm3 engine completed\n");
431 mutex_unlock(&lm->lock);
435 * We cannot use I2C in interrupt context, so we just schedule work.
437 static irqreturn_t lm8323_irq(int irq, void *data)
439 struct lm8323_chip *lm = data;
441 schedule_work(&lm->work);
449 static int lm8323_read_id(struct lm8323_chip *lm, u8 *buf)
453 bytes = lm8323_read(lm, LM8323_CMD_READ_ID, buf, 2);
454 if (unlikely(bytes != 2))
460 static void lm8323_write_pwm_one(struct lm8323_pwm *pwm, int pos, u16 cmd)
462 struct lm8323_chip *lm = pwm_to_lm8323(pwm);
464 lm8323_write(lm, 4, LM8323_CMD_PWM_WRITE, (pos << 2) | pwm->id,
465 (cmd & 0xff00) >> 8, cmd & 0x00ff);
469 * Write a script into a given PWM engine, concluding with PWM_END.
470 * If 'kill' is nonzero, the engine will be shut down at the end
471 * of the script, producing a zero output. Otherwise the engine
472 * will be kept running at the final PWM level indefinitely.
474 static void lm8323_write_pwm(struct lm8323_pwm *pwm, int kill,
475 int len, const u16 *cmds)
477 struct lm8323_chip *lm = pwm_to_lm8323(pwm);
480 for (i = 0; i < len; i++)
481 lm8323_write_pwm_one(pwm, i, cmds[i]);
483 lm8323_write_pwm_one(pwm, i++, PWM_END(kill));
484 lm8323_write(lm, 2, LM8323_CMD_START_PWM, pwm->id);
488 static void lm8323_pwm_work(struct work_struct *work)
490 struct lm8323_pwm *pwm = work_to_pwm(work);
491 int div512, perstep, steps, hz, up, kill;
495 mutex_lock(&pwm->lock);
498 * Do nothing if we're already at the requested level,
499 * or previous setting is not yet complete. In the latter
500 * case we will be called again when the previous PWM script
503 if (pwm->running || pwm->desired_brightness == pwm->brightness) {
504 mutex_unlock(&pwm->lock);
508 kill = (pwm->desired_brightness == 0);
509 up = (pwm->desired_brightness > pwm->brightness);
510 steps = abs(pwm->desired_brightness - pwm->brightness);
513 * Convert time (in ms) into a divisor (512 or 16 on a refclk of
514 * 32768Hz), and number of ticks per step.
516 if ((pwm->fade_time / steps) > (32768 / 512)) {
524 perstep = (hz * pwm->fade_time) / (steps * 1000);
528 else if (perstep > 63)
535 pwm_cmds[num_cmds++] = PWM_RAMP(div512, perstep, s, up);
539 lm8323_write_pwm(pwm, kill, num_cmds, pwm_cmds);
541 pwm->brightness = pwm->desired_brightness;
542 mutex_unlock(&pwm->lock);
545 static void lm8323_pwm_set_brightness(struct led_classdev *led_cdev,
546 enum led_brightness brightness)
548 struct lm8323_pwm *pwm = cdev_to_pwm(led_cdev);
549 struct lm8323_chip *lm = pwm_to_lm8323(pwm);
551 mutex_lock(&pwm->lock);
552 pwm->desired_brightness = brightness;
553 mutex_unlock(&pwm->lock);
555 if (in_interrupt()) {
556 schedule_work(&pwm->work);
559 * Schedule PWM work as usual unless we are going into suspend
561 mutex_lock(&lm->lock);
562 if (likely(!lm->pm_suspend))
563 schedule_work(&pwm->work);
565 lm8323_pwm_work(&pwm->work);
566 mutex_unlock(&lm->lock);
570 static ssize_t lm8323_pwm_show_time(struct device *dev,
571 struct device_attribute *attr, char *buf)
573 struct led_classdev *led_cdev = dev_get_drvdata(dev);
574 struct lm8323_pwm *pwm = cdev_to_pwm(led_cdev);
576 return sprintf(buf, "%d\n", pwm->fade_time);
579 static ssize_t lm8323_pwm_store_time(struct device *dev,
580 struct device_attribute *attr, const char *buf, size_t len)
582 struct led_classdev *led_cdev = dev_get_drvdata(dev);
583 struct lm8323_pwm *pwm = cdev_to_pwm(led_cdev);
587 ret = strict_strtoul(buf, 10, &time);
588 /* Numbers only, please. */
592 pwm->fade_time = time;
596 static DEVICE_ATTR(time, 0644, lm8323_pwm_show_time, lm8323_pwm_store_time);
598 static int init_pwm(struct lm8323_chip *lm, int id, struct device *dev,
601 struct lm8323_pwm *pwm = NULL;
620 pwm->desired_brightness = 0;
622 mutex_init(&pwm->lock);
624 pwm->cdev.name = name;
625 pwm->cdev.brightness_set = lm8323_pwm_set_brightness;
626 if (led_classdev_register(dev, &pwm->cdev) < 0) {
627 dev_err(dev, "couldn't register PWM %d\n", id);
630 if (device_create_file(pwm->cdev.dev,
631 &dev_attr_time) < 0) {
632 dev_err(dev, "couldn't register time attribute\n");
633 led_classdev_unregister(&pwm->cdev);
636 INIT_WORK(&pwm->work, lm8323_pwm_work);
645 static struct i2c_driver lm8323_i2c_driver;
647 static ssize_t lm8323_show_disable(struct device *dev,
648 struct device_attribute *attr, char *buf)
650 struct lm8323_chip *lm = dev_get_drvdata(dev);
652 return sprintf(buf, "%u\n", !lm->kp_enabled);
655 static ssize_t lm8323_set_disable(struct device *dev,
656 struct device_attribute *attr,
657 const char *buf, size_t count)
659 struct lm8323_chip *lm = dev_get_drvdata(dev);
663 ret = strict_strtoul(buf, 10, &i);
665 mutex_lock(&lm->lock);
667 mutex_unlock(&lm->lock);
671 static DEVICE_ATTR(disable_kp, 0644, lm8323_show_disable, lm8323_set_disable);
673 static int lm8323_probe(struct i2c_client *client,
674 const struct i2c_device_id *id)
676 struct lm8323_platform_data *pdata;
677 struct input_dev *idev;
678 struct lm8323_chip *lm;
683 lm = kzalloc(sizeof *lm, GFP_KERNEL);
687 i2c_set_clientdata(client, lm);
689 pdata = client->dev.platform_data;
690 if (!pdata || !pdata->size_x || !pdata->size_y) {
691 dev_err(&client->dev, "missing platform_data\n");
696 lm->size_x = pdata->size_x;
697 if (lm->size_x > 8) {
698 dev_err(&client->dev, "invalid x size %d specified\n",
704 lm->size_y = pdata->size_y;
705 if (lm->size_y > 12) {
706 dev_err(&client->dev, "invalid y size %d specified\n",
712 dev_vdbg(&client->dev, "Keypad size: %d x %d\n",
713 lm->size_x, lm->size_y);
715 lm->debounce_time = pdata->debounce_time;
716 lm->active_time = pdata->active_time;
720 /* Nothing's set up to service the IRQ yet, so just spin for max.
721 * 100ms until we can configure. */
722 tmo = jiffies + msecs_to_jiffies(100);
723 while (lm8323_read(lm, LM8323_CMD_READ_INT, data, 1) == 1) {
724 if (data[0] & INT_NOINIT)
727 if (time_after(jiffies, tmo)) {
728 dev_err(&client->dev,
729 "timeout waiting for initialisation\n");
735 lm8323_configure(lm);
737 /* If a true probe check the device */
738 if (lm8323_read_id(lm, data) != 0) {
739 dev_err(&client->dev, "device not found\n");
744 if (init_pwm(lm, 1, &client->dev, pdata->pwm1_name) < 0)
746 if (init_pwm(lm, 2, &client->dev, pdata->pwm2_name) < 0)
748 if (init_pwm(lm, 3, &client->dev, pdata->pwm3_name) < 0)
751 mutex_init(&lm->lock);
752 INIT_WORK(&lm->work, lm8323_work);
754 err = request_irq(client->irq, lm8323_irq,
755 IRQF_TRIGGER_FALLING | IRQF_DISABLED,
758 dev_err(&client->dev, "could not get IRQ %d\n", client->irq);
762 device_init_wakeup(&client->dev, 1);
763 enable_irq_wake(client->irq);
766 err = device_create_file(&client->dev, &dev_attr_disable_kp);
770 idev = input_allocate_device();
777 idev->name = pdata->name;
779 idev->name = "LM8323 keypad";
780 snprintf(lm->phys, sizeof(lm->phys), "%s/input-kp", dev_name(&client->dev));
781 idev->phys = lm->phys;
784 idev->evbit[0] = BIT(EV_KEY);
785 for (i = 0; i < LM8323_KEYMAP_SIZE; i++) {
786 if (pdata->keymap[i] > 0)
787 __set_bit(pdata->keymap[i], idev->keybit);
789 lm->keymap[i] = pdata->keymap[i];
793 __set_bit(EV_REP, idev->evbit);
796 err = input_register_device(idev);
798 dev_dbg(&client->dev, "error registering input device\n");
805 device_remove_file(&client->dev, &dev_attr_disable_kp);
807 free_irq(client->irq, lm);
809 if (lm->pwm3.enabled)
810 led_classdev_unregister(&lm->pwm3.cdev);
812 if (lm->pwm2.enabled)
813 led_classdev_unregister(&lm->pwm2.cdev);
815 if (lm->pwm1.enabled)
816 led_classdev_unregister(&lm->pwm1.cdev);
823 static int lm8323_remove(struct i2c_client *client)
825 struct lm8323_chip *lm = i2c_get_clientdata(client);
827 disable_irq_wake(client->irq);
828 free_irq(client->irq, lm);
829 cancel_work_sync(&lm->work);
830 input_unregister_device(lm->idev);
831 device_remove_file(&lm->client->dev, &dev_attr_disable_kp);
832 if (lm->pwm3.enabled)
833 led_classdev_unregister(&lm->pwm3.cdev);
834 if (lm->pwm2.enabled)
835 led_classdev_unregister(&lm->pwm2.cdev);
836 if (lm->pwm1.enabled)
837 led_classdev_unregister(&lm->pwm1.cdev);
845 * We don't need to explicitly suspend the chip, as it already switches off
846 * when there's no activity.
848 static int lm8323_suspend(struct i2c_client *client, pm_message_t mesg)
850 struct lm8323_chip *lm = i2c_get_clientdata(client);
852 set_irq_wake(client->irq, 0);
853 disable_irq(client->irq);
855 mutex_lock(&lm->lock);
857 mutex_unlock(&lm->lock);
859 if (lm->pwm1.enabled)
860 led_classdev_suspend(&lm->pwm1.cdev);
861 if (lm->pwm2.enabled)
862 led_classdev_suspend(&lm->pwm2.cdev);
863 if (lm->pwm3.enabled)
864 led_classdev_suspend(&lm->pwm3.cdev);
869 static int lm8323_resume(struct i2c_client *client)
871 struct lm8323_chip *lm = i2c_get_clientdata(client);
873 mutex_lock(&lm->lock);
875 mutex_unlock(&lm->lock);
877 if (lm->pwm1.enabled)
878 led_classdev_resume(&lm->pwm1.cdev);
879 if (lm->pwm2.enabled)
880 led_classdev_resume(&lm->pwm2.cdev);
881 if (lm->pwm3.enabled)
882 led_classdev_resume(&lm->pwm3.cdev);
884 enable_irq(client->irq);
885 set_irq_wake(client->irq, 1);
890 #define lm8323_suspend NULL
891 #define lm8323_resume NULL
894 static const struct i2c_device_id lm8323_id[] = {
899 static struct i2c_driver lm8323_i2c_driver = {
903 .probe = lm8323_probe,
904 .remove = lm8323_remove,
905 .suspend = lm8323_suspend,
906 .resume = lm8323_resume,
907 .id_table = lm8323_id,
909 MODULE_DEVICE_TABLE(i2c, lm8323_id);
911 static int __init lm8323_init(void)
913 return i2c_add_driver(&lm8323_i2c_driver);
915 module_init(lm8323_init);
917 static void __exit lm8323_exit(void)
919 i2c_del_driver(&lm8323_i2c_driver);
921 module_exit(lm8323_exit);
923 MODULE_AUTHOR("Timo O. Karjalainen <timo.o.karjalainen@nokia.com>");
924 MODULE_AUTHOR("Daniel Stone");
925 MODULE_AUTHOR("Felipe Balbi <felipe.balbi@nokia.com>");
926 MODULE_DESCRIPTION("LM8323 keypad driver");
927 MODULE_LICENSE("GPL");