2 * drivers/i2c/chips/lm8323.c
4 * Copyright (C) 2007 Nokia Corporation
6 * Written by Daniel Stone <daniel.stone@nokia.com>
7 * Timo O. Karjalainen <timo.o.karjalainen@nokia.com>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation (version 2 of the License only).
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 #include <linux/module.h>
24 #include <linux/i2c.h>
25 #include <linux/interrupt.h>
26 #include <linux/sched.h>
27 #include <linux/mutex.h>
28 #include <linux/delay.h>
29 #include <linux/input.h>
30 #include <linux/leds.h>
31 #include <linux/i2c/lm8323.h>
33 #include <asm/mach-types.h>
34 #include <asm/mach/irq.h>
42 /* Commands to send to the chip. */
43 #define LM8323_CMD_READ_ID 0x80 /* Read chip ID. */
44 #define LM8323_CMD_WRITE_CFG 0x81 /* Set configuration item. */
45 #define LM8323_CMD_READ_INT 0x82 /* Get interrupt status. */
46 #define LM8323_CMD_RESET 0x83 /* Reset, same as external one */
47 #define LM8323_CMD_WRITE_PORT_SEL 0x85 /* Set GPIO in/out. */
48 #define LM8323_CMD_WRITE_PORT_STATE 0x86 /* Set GPIO pullup. */
49 #define LM8323_CMD_READ_PORT_SEL 0x87 /* Get GPIO in/out. */
50 #define LM8323_CMD_READ_PORT_STATE 0x88 /* Get GPIO pullup. */
51 #define LM8323_CMD_READ_FIFO 0x89 /* Read byte from FIFO. */
52 #define LM8323_CMD_RPT_READ_FIFO 0x8a /* Read FIFO (no increment). */
53 #define LM8323_CMD_SET_ACTIVE 0x8b /* Set active time. */
54 #define LM8323_CMD_READ_ERR 0x8c /* Get error status. */
55 #define LM8323_CMD_READ_ROTATOR 0x8e /* Read rotator status. */
56 #define LM8323_CMD_SET_DEBOUNCE 0x8f /* Set debouncing time. */
57 #define LM8323_CMD_SET_KEY_SIZE 0x90 /* Set keypad size. */
58 #define LM8323_CMD_READ_KEY_SIZE 0x91 /* Get keypad size. */
59 #define LM8323_CMD_READ_CFG 0x92 /* Get configuration item. */
60 #define LM8323_CMD_WRITE_CLOCK 0x93 /* Set clock config. */
61 #define LM8323_CMD_READ_CLOCK 0x94 /* Get clock config. */
62 #define LM8323_CMD_PWM_WRITE 0x95 /* Write PWM script. */
63 #define LM8323_CMD_START_PWM 0x96 /* Start PWM engine. */
64 #define LM8323_CMD_STOP_PWM 0x97 /* Stop PWM engine. */
66 /* Interrupt status. */
67 #define INT_KEYPAD 0x01 /* Key event. */
68 #define INT_ROTATOR 0x02 /* Rotator event. */
69 #define INT_ERROR 0x08 /* Error: use CMD_READ_ERR. */
70 #define INT_NOINIT 0x10 /* Lost configuration. */
71 #define INT_PWM1 0x20 /* PWM1 stopped. */
72 #define INT_PWM2 0x40 /* PWM2 stopped. */
73 #define INT_PWM3 0x80 /* PWM3 stopped. */
75 /* Errors (signalled by INT_ERROR, read with CMD_READ_ERR). */
76 #define ERR_BADPAR 0x01 /* Bad parameter. */
77 #define ERR_CMDUNK 0x02 /* Unknown command. */
78 #define ERR_KEYOVR 0x04 /* Too many keys pressed. */
79 #define ERR_FIFOOVER 0x40 /* FIFO overflow. */
81 /* Configuration keys (CMD_{WRITE,READ}_CFG). */
82 #define CFG_MUX1SEL 0x01 /* Select MUX1_OUT input. */
83 #define CFG_MUX1EN 0x02 /* Enable MUX1_OUT. */
84 #define CFG_MUX2SEL 0x04 /* Select MUX2_OUT input. */
85 #define CFG_MUX2EN 0x08 /* Enable MUX2_OUT. */
86 #define CFG_PSIZE 0x20 /* Package size (must be 0). */
87 #define CFG_ROTEN 0x40 /* Enable rotator. */
89 /* Clock settings (CMD_{WRITE,READ}_CLOCK). */
90 #define CLK_RCPWM_INTERNAL 0x00
91 #define CLK_RCPWM_EXTERNAL 0x03
92 #define CLK_SLOWCLKEN 0x08 /* Enable 32.768kHz clock. */
93 #define CLK_SLOWCLKOUT 0x40 /* Enable slow pulse output. */
95 /* The possible addresses corresponding to CONFIG1 and CONFIG2 pin wirings. */
96 #define LM8323_I2C_ADDR00 (0x84 >> 1) /* 1000 010x */
97 #define LM8323_I2C_ADDR01 (0x86 >> 1) /* 1000 011x */
98 #define LM8323_I2C_ADDR10 (0x88 >> 1) /* 1000 100x */
99 #define LM8323_I2C_ADDR11 (0x8A >> 1) /* 1000 101x */
101 /* Key event fifo length */
102 #define LM8323_FIFO_LEN 15
104 /* Commands for PWM engine; feed in with PWM_WRITE. */
105 /* Load ramp counter from duty cycle field (range 0 - 0xff). */
106 #define PWM_SET(v) (0x4000 | ((v) & 0xff))
107 /* Go to start of script. */
108 #define PWM_GOTOSTART 0x0000
110 * Stop engine (generates interrupt). If reset is 1, clear the program
111 * counter, else leave it.
113 #define PWM_END(reset) (0xc000 | (!!(reset) << 11))
115 * Ramp. If s is 1, divide clock by 512, else divide clock by 16.
116 * Take t clock scales (up to 63) per step, for n steps (up to 126).
117 * If u is set, ramp up, else ramp down.
119 #define PWM_RAMP(s, t, n, u) ((!!(s) << 14) | ((t) & 0x3f) << 8 | \
120 ((n) & 0x7f) | ((u) ? 0 : 0x80))
122 * Loop (i.e. jump back to pos) for a given number of iterations (up to 63).
123 * If cnt is zero, execute until PWM_END is encountered.
125 #define PWM_LOOP(cnt, pos) (0xa000 | (((cnt) & 0x3f) << 7) | \
128 * Wait for trigger. Argument is a mask of channels, shifted by the channel
129 * number, e.g. 0xa for channels 3 and 1. Note that channels are numbered
132 #define PWM_WAIT_TRIG(chans) (0xe000 | (((chans) & 0x7) << 6))
133 /* Send trigger. Argument is same as PWM_WAIT_TRIG. */
134 #define PWM_SEND_TRIG(chans) (0xe000 | ((chans) & 0x7))
136 #define DRIVER_NAME "lm8323"
143 int desired_brightness;
144 struct work_struct work;
145 struct led_classdev cdev;
150 struct i2c_client *client;
151 struct work_struct work;
152 struct input_dev *idev;
154 unsigned kp_enabled : 1;
155 unsigned pm_suspend : 1;
158 s16 keymap[LM8323_KEYMAP_SIZE];
163 struct lm8323_pwm pwm1;
164 struct lm8323_pwm pwm2;
165 struct lm8323_pwm pwm3;
168 #define client_to_lm8323(c) container_of(c, struct lm8323_chip, client)
169 #define dev_to_lm8323(d) container_of(d, struct lm8323_chip, client->dev)
170 #define work_to_lm8323(w) container_of(w, struct lm8323_chip, work)
171 #define cdev_to_pwm(c) container_of(c, struct lm8323_pwm, cdev)
172 #define work_to_pwm(w) container_of(w, struct lm8323_pwm, work)
174 static struct lm8323_chip *pwm_to_lm8323(struct lm8323_pwm *pwm)
178 return container_of(pwm, struct lm8323_chip, pwm1);
180 return container_of(pwm, struct lm8323_chip, pwm2);
182 return container_of(pwm, struct lm8323_chip, pwm3);
188 static struct lm8323_platform_data *lm8323_pdata;
191 #define LM8323_MAX_DATA 8
194 * To write, we just access the chip's address in write mode, and dump the
195 * command and data out on the bus. The command byte and data are taken as
196 * sequential u8s out of varargs, to a maximum of LM8323_MAX_DATA.
198 static int lm8323_write(struct lm8323_chip *lm, int len, ...)
202 u8 data[LM8323_MAX_DATA];
206 if (unlikely(len > LM8323_MAX_DATA)) {
207 dev_err(&lm->client->dev, "tried to send %d bytes\n", len);
212 for (i = 0; i < len; i++)
213 data[i] = va_arg(ap, int);
218 * If the host is asleep while we send the data, we can get a NACK
219 * back while it wakes up, so try again, once.
221 ret = i2c_master_send(lm->client, data, len);
222 if (unlikely(ret == -EREMOTEIO))
223 ret = i2c_master_send(lm->client, data, len);
224 if (unlikely(ret != len))
225 dev_err(&lm->client->dev, "sent %d bytes of %d total\n",
232 * To read, we first send the command byte to the chip and end the transaction,
233 * then access the chip in read mode, at which point it will send the data.
235 static int lm8323_read(struct lm8323_chip *lm, u8 cmd, u8 *buf, int len)
240 * If the host is asleep while we send the byte, we can get a NACK
241 * back while it wakes up, so try again, once.
243 ret = i2c_master_send(lm->client, &cmd, 1);
244 if (unlikely(ret == -EREMOTEIO))
245 ret = i2c_master_send(lm->client, &cmd, 1);
246 if (unlikely(ret != 1)) {
247 dev_err(&lm->client->dev, "sending read cmd 0x%02x failed\n",
252 ret = i2c_master_recv(lm->client, buf, len);
253 if (unlikely(ret != len))
254 dev_err(&lm->client->dev, "wanted %d bytes, got %d\n",
261 * Set the chip active time (idle time before it enters halt).
263 static void lm8323_set_active_time(struct lm8323_chip *lm, int time)
265 lm8323_write(lm, 2, LM8323_CMD_SET_ACTIVE, time >> 2);
269 * The signals are AT-style: the low 7 bits are the keycode, and the top
270 * bit indicates the state (1 for down, 0 for up).
272 static inline u8 lm8323_whichkey(u8 event)
277 static inline int lm8323_ispress(u8 event)
279 return (event & 0x80) ? 1 : 0;
282 static void process_keys(struct lm8323_chip *lm)
285 u8 key_fifo[LM8323_FIFO_LEN + 1];
286 int old_keys_down = lm->keys_down;
291 * Read all key events from the FIFO at once. Next READ_FIFO clears the
292 * FIFO even if we didn't read all events previously.
294 ret = lm8323_read(lm, LM8323_CMD_READ_FIFO, key_fifo, LM8323_FIFO_LEN);
297 dev_err(&lm->client->dev, "Failed reading fifo \n");
302 while ((event = key_fifo[i])) {
303 u8 key = lm8323_whichkey(event);
304 int isdown = lm8323_ispress(event);
305 s16 keycode = lm->keymap[key];
307 if (likely(keycode > 0)) {
308 debug(&lm->client->dev, "key 0x%02x %s\n", key,
309 isdown ? "down" : "up");
310 if (likely(lm->kp_enabled)) {
311 input_report_key(lm->idev, keycode, isdown);
312 input_sync(lm->idev);
319 dev_err(&lm->client->dev, "keycode 0x%02x not mapped "
320 "to any key\n", key);
326 * Errata: We need to ensure that the chip never enters halt mode
327 * during a keypress, so set active time to 0. When it's released,
328 * we can enter halt again, so set the active time back to normal.
330 if (!old_keys_down && lm->keys_down)
331 lm8323_set_active_time(lm, 0);
332 if (old_keys_down && !lm->keys_down)
333 lm8323_set_active_time(lm, lm->active_time);
336 static void lm8323_process_error(struct lm8323_chip *lm)
340 if (lm8323_read(lm, LM8323_CMD_READ_ERR, &error, 1) == 1) {
341 if (error & ERR_FIFOOVER)
342 debug(&lm->client->dev, "fifo overflow!\n");
343 if (error & ERR_KEYOVR)
344 debug(&lm->client->dev, "more than two keys pressed\n");
345 if (error & ERR_CMDUNK)
346 debug(&lm->client->dev, "unknown command submitted\n");
347 if (error & ERR_BADPAR)
348 debug(&lm->client->dev, "bad command parameter\n");
352 static void lm8323_reset(struct lm8323_chip *lm)
354 /* The docs say we must pass 0xAA as the data byte. */
355 lm8323_write(lm, 2, LM8323_CMD_RESET, 0xAA);
358 static int lm8323_configure(struct lm8323_chip *lm)
360 int keysize = (lm->size_x << 4) | lm->size_y;
361 int clock = (CLK_SLOWCLKEN | CLK_RCPWM_EXTERNAL);
362 int debounce = lm->debounce_time >> 2;
363 int active = lm->active_time >> 2;
366 * Active time must be greater than the debounce time: if it's
367 * a close-run thing, give ourselves a 12ms buffer.
369 if (debounce >= active)
370 active = debounce + 3;
372 lm8323_write(lm, 2, LM8323_CMD_WRITE_CFG, 0);
373 lm8323_write(lm, 2, LM8323_CMD_WRITE_CLOCK, clock);
374 lm8323_write(lm, 2, LM8323_CMD_SET_KEY_SIZE, keysize);
375 lm8323_set_active_time(lm, lm->active_time);
376 lm8323_write(lm, 2, LM8323_CMD_SET_DEBOUNCE, debounce);
377 lm8323_write(lm, 3, LM8323_CMD_WRITE_PORT_STATE, 0xff, 0xff);
378 lm8323_write(lm, 3, LM8323_CMD_WRITE_PORT_SEL, 0, 0);
381 * Not much we can do about errors at this point, so just hope
389 * Bottom half: handle the interrupt by posting key events, or dealing with
390 * errors appropriately.
392 static void lm8323_work(struct work_struct *work)
394 struct lm8323_chip *lm = work_to_lm8323(work);
397 mutex_lock(&lm->lock);
399 while ((lm8323_read(lm, LM8323_CMD_READ_INT, &ints, 1) == 1) && ints) {
400 if (likely(ints & INT_KEYPAD))
402 if (ints & INT_ROTATOR) {
403 /* We don't currently support the rotator. */
404 debug(&lm->client->dev, "rotator fired\n");
406 if (ints & INT_ERROR) {
407 debug(&lm->client->dev, "error!\n");
408 lm8323_process_error(lm);
410 if (ints & INT_NOINIT) {
411 dev_err(&lm->client->dev, "chip lost config; "
413 lm8323_configure(lm);
416 debug(&lm->client->dev, "pwm1 engine completed\n");
418 debug(&lm->client->dev, "pwm2 engine completed\n");
420 debug(&lm->client->dev, "pwm3 engine completed\n");
423 mutex_unlock(&lm->lock);
427 * We cannot use I2C in interrupt context, so we just schedule work.
429 static irqreturn_t lm8323_irq(int irq, void *data)
431 struct lm8323_chip *lm = data;
433 schedule_work(&lm->work);
441 static int lm8323_read_id(struct lm8323_chip *lm, u8 *buf)
445 bytes = lm8323_read(lm, LM8323_CMD_READ_ID, buf, 2);
446 if (unlikely(bytes != 2))
452 static void lm8323_write_pwm_one(struct lm8323_pwm *pwm, int pos, u16 cmd)
454 struct lm8323_chip *lm = pwm_to_lm8323(pwm);
456 lm8323_write(lm, 4, LM8323_CMD_PWM_WRITE, (pos << 2) | pwm->id,
457 (cmd & 0xff00) >> 8, cmd & 0x00ff);
461 * Write a script into a given PWM engine, concluding with PWM_END.
462 * If 'keepalive' is specified, the engine will be kept running
465 static void lm8323_write_pwm(struct lm8323_pwm *pwm, int keepalive,
468 struct lm8323_chip *lm = pwm_to_lm8323(pwm);
473 * If there are any scripts running at the moment, terminate them
474 * and make sure the duty cycle is as if it finished.
476 lm8323_write(lm, 2, LM8323_CMD_STOP_PWM, pwm->id);
479 for (i = 0; i < len; i++) {
480 cmd = va_arg(ap, int);
481 lm8323_write_pwm_one(pwm, i, cmd);
485 /* Wait for a trigger from any channel. This keeps the engine alive. */
487 lm8323_write_pwm_one(pwm, i++, PWM_WAIT_TRIG(0xe));
489 lm8323_write_pwm_one(pwm, i++, PWM_END(1));
491 lm8323_write(lm, 2, LM8323_CMD_START_PWM, pwm->id);
494 static void lm8323_pwm_work(struct work_struct *work)
496 struct lm8323_pwm *pwm = work_to_pwm(work);
497 int div, perstep, steps, hz, direction, keepalive;
499 /* Do nothing if we're already at the requested level. */
500 if (pwm->desired_brightness == pwm->brightness)
503 keepalive = (pwm->desired_brightness > 0);
504 direction = (pwm->desired_brightness > pwm->brightness);
505 steps = abs(pwm->desired_brightness - pwm->brightness);
508 * Convert time (in ms) into a divisor (512 or 16 on a refclk of
509 * 32768Hz), and number of ticks per step.
511 if ((pwm->fade_time / steps) > (32768 / 512))
517 if (pwm->fade_time < ((steps * 1000) / hz))
520 perstep = (hz * pwm->fade_time) / (steps * 1000);
524 else if (perstep > 63)
528 lm8323_write_pwm(pwm, keepalive, 3,
529 PWM_RAMP((div == 512), perstep, 126,
531 PWM_RAMP((div == 512), perstep, 126,
533 PWM_RAMP((div == 512), perstep, steps - 252,
535 } else if (steps > 126) {
536 lm8323_write_pwm(pwm, keepalive, 2,
537 PWM_RAMP((div == 512), perstep, 126,
539 PWM_RAMP((div == 512), perstep, steps - 126,
542 lm8323_write_pwm(pwm, keepalive, 1,
543 PWM_RAMP((div == 512), perstep, steps,
547 pwm->brightness = pwm->desired_brightness;
550 static void lm8323_pwm_set_brightness(struct led_classdev *led_cdev,
551 enum led_brightness brightness)
553 struct lm8323_pwm *pwm = cdev_to_pwm(led_cdev);
554 struct lm8323_chip *lm = pwm_to_lm8323(pwm);
556 pwm->desired_brightness = brightness;
558 if (in_interrupt()) {
559 schedule_work(&pwm->work);
562 * Schedule PWM work as usual unless we are going into suspend
564 mutex_lock(&lm->lock);
565 if (likely(!lm->pm_suspend))
566 schedule_work(&pwm->work);
568 lm8323_pwm_work(&pwm->work);
569 mutex_unlock(&lm->lock);
573 static ssize_t lm8323_pwm_show_time(struct device *dev,
574 struct device_attribute *attr, char *buf)
576 struct led_classdev *led_cdev = dev_get_drvdata(dev);
577 struct lm8323_pwm *pwm = cdev_to_pwm(led_cdev);
579 return sprintf(buf, "%d\n", pwm->fade_time);
582 static ssize_t lm8323_pwm_store_time(struct device *dev,
583 struct device_attribute *attr, const char *buf, size_t len)
585 struct led_classdev *led_cdev = dev_get_drvdata(dev);
586 struct lm8323_pwm *pwm = cdev_to_pwm(led_cdev);
590 ret = sscanf(buf, "%d", &time);
591 /* Numbers only, please. */
595 pwm->fade_time = time;
599 static DEVICE_ATTR(time, 0644, lm8323_pwm_show_time, lm8323_pwm_store_time);
601 static int init_pwm(struct lm8323_chip *lm, int id, struct device *dev,
604 struct lm8323_pwm *pwm = NULL;
623 pwm->desired_brightness = 0;
625 pwm->cdev.name = name;
626 pwm->cdev.brightness_set = lm8323_pwm_set_brightness;
627 if (led_classdev_register(dev, &pwm->cdev) < 0) {
628 dev_err(dev, "couldn't register PWM %d\n", id);
631 if (device_create_file(pwm->cdev.dev,
632 &dev_attr_time) < 0) {
633 dev_err(dev, "couldn't register time attribute\n");
634 led_classdev_unregister(&pwm->cdev);
637 INIT_WORK(&pwm->work, lm8323_pwm_work);
646 static struct i2c_driver lm8323_i2c_driver;
648 static ssize_t lm8323_show_disable(struct device *dev,
649 struct device_attribute *attr, char *buf)
651 struct lm8323_chip *lm = dev_get_drvdata(dev);
653 return sprintf(buf, "%u\n", !lm->kp_enabled);
656 static ssize_t lm8323_set_disable(struct device *dev,
657 struct device_attribute *attr,
658 const char *buf, size_t count)
660 struct lm8323_chip *lm = dev_get_drvdata(dev);
664 i = sscanf(buf, "%d", &ret);
666 mutex_lock(&lm->lock);
668 mutex_unlock(&lm->lock);
672 static DEVICE_ATTR(disable_kp, 0644, lm8323_show_disable, lm8323_set_disable);
674 static int lm8323_probe(struct i2c_client *client)
676 struct input_dev *idev;
677 struct lm8323_chip *lm;
682 lm = kzalloc(sizeof *lm, GFP_KERNEL);
686 i2c_set_clientdata(client, lm);
688 lm8323_pdata = client->dev.platform_data;
690 return -EINVAL; /* ? */
692 lm->size_x = lm8323_pdata->size_x;
693 if (lm->size_x == 0) {
695 } else if (lm->size_x > 8) {
696 dev_err(&client->dev, "invalid x size %d specified\n",
701 lm->size_y = lm8323_pdata->size_y;
702 if (lm->size_y == 0) {
704 } else if (lm->size_y > 12) {
705 dev_err(&client->dev, "invalid y size %d specified\n",
710 debug(&c->dev, "Keypad size: %d x %d\n", lm->size_x, lm->size_y);
712 lm->debounce_time = lm8323_pdata->debounce_time;
713 if (lm->debounce_time == 0) /* Default. */
714 lm->debounce_time = 12;
715 else if (lm->debounce_time == -1) /* Disable debounce. */
716 lm->debounce_time = 0;
718 lm->active_time = lm8323_pdata->active_time;
719 if (lm->active_time == 0) /* Default. */
720 lm->active_time = 500;
721 else if (lm->active_time == -1) /* Disable sleep. */
726 /* Nothing's set up to service the IRQ yet, so just spin for max.
727 * 100ms until we can configure. */
728 tmo = jiffies + msecs_to_jiffies(100);
729 while (lm8323_read(lm, LM8323_CMD_READ_INT, data, 1) == 1) {
730 if (data[0] & INT_NOINIT)
733 if (time_after(jiffies, tmo)) {
734 dev_err(&client->dev,
735 "timeout waiting for initialisation\n");
741 lm8323_configure(lm);
743 /* If a true probe check the device */
744 if (lm8323_read_id(lm, data) != 0) {
745 dev_err(&client->dev, "device not found\n");
750 if (init_pwm(lm, 1, &client->dev, lm8323_pdata->pwm1_name) < 0)
752 if (init_pwm(lm, 2, &client->dev, lm8323_pdata->pwm2_name) < 0)
754 if (init_pwm(lm, 3, &client->dev, lm8323_pdata->pwm3_name) < 0)
757 lm->irq = lm8323_pdata->irq_gpio;
758 debug(&c->dev, "IRQ: %d\n", lm->irq);
760 mutex_init(&lm->lock);
761 INIT_WORK(&lm->work, lm8323_work);
763 err = request_irq(client->irq, lm8323_irq,
764 IRQF_TRIGGER_FALLING | IRQF_DISABLED |
765 IRQF_SAMPLE_RANDOM, DRIVER_NAME, lm);
767 dev_err(&client->dev, "could not get IRQ %d\n", lm->irq);
771 set_irq_wake(lm->irq, 1);
774 err = device_create_file(&client->dev, &dev_attr_disable_kp);
778 idev = input_allocate_device();
784 if (lm8323_pdata->name)
785 idev->name = lm8323_pdata->name;
787 idev->name = "LM8323 keypad";
788 snprintf(lm->phys, sizeof(lm->phys), "%s/input-kp", client->dev.bus_id);
789 idev->phys = lm->phys;
792 idev->evbit[0] = BIT(EV_KEY);
793 for (i = 0; i < LM8323_KEYMAP_SIZE; i++) {
794 if (lm8323_pdata->keymap[i] > 0)
795 set_bit(lm8323_pdata->keymap[i], idev->keybit);
797 lm->keymap[i] = lm8323_pdata->keymap[i];
800 if (lm8323_pdata->repeat)
801 set_bit(EV_REP, idev->evbit);
804 if (input_register_device(idev)) {
805 dev_dbg(&client->dev, "error registering input device\n");
812 device_remove_file(&client->dev, &dev_attr_disable_kp);
814 free_irq(lm->irq, lm);
816 if (lm->pwm3.enabled)
817 led_classdev_unregister(&lm->pwm3.cdev);
819 if (lm->pwm2.enabled)
820 led_classdev_unregister(&lm->pwm2.cdev);
822 if (lm->pwm1.enabled)
823 led_classdev_unregister(&lm->pwm1.cdev);
830 static int lm8323_remove(struct i2c_client *client)
832 struct lm8323_chip *lm = i2c_get_clientdata(client);
834 free_irq(lm->irq, lm);
835 device_remove_file(&lm->client->dev, &dev_attr_disable_kp);
841 * We don't need to explicitly suspend the chip, as it already switches off
842 * when there's no activity.
844 static int lm8323_suspend(struct i2c_client *client, pm_message_t mesg)
846 struct lm8323_chip *lm = i2c_get_clientdata(client);
848 set_irq_wake(lm->irq, 0);
849 disable_irq(lm->irq);
851 mutex_lock(&lm->lock);
853 mutex_unlock(&lm->lock);
855 if (lm->pwm1.enabled)
856 led_classdev_suspend(&lm->pwm1.cdev);
857 if (lm->pwm2.enabled)
858 led_classdev_suspend(&lm->pwm2.cdev);
859 if (lm->pwm3.enabled)
860 led_classdev_suspend(&lm->pwm3.cdev);
865 static int lm8323_resume(struct i2c_client *client)
867 struct lm8323_chip *lm = i2c_get_clientdata(client);
869 mutex_lock(&lm->lock);
871 mutex_unlock(&lm->lock);
873 if (lm->pwm1.enabled)
874 led_classdev_resume(&lm->pwm1.cdev);
875 if (lm->pwm2.enabled)
876 led_classdev_resume(&lm->pwm2.cdev);
877 if (lm->pwm3.enabled)
878 led_classdev_resume(&lm->pwm3.cdev);
881 set_irq_wake(lm->irq, 1);
886 static struct i2c_driver lm8323_i2c_driver = {
890 .probe = lm8323_probe,
891 .remove = __exit_p(lm8323_remove),
892 .suspend = lm8323_suspend,
893 .resume = lm8323_resume,
896 static int __init lm8323_init(void)
898 return i2c_add_driver(&lm8323_i2c_driver);
901 static void __exit lm8323_exit(void)
903 i2c_del_driver(&lm8323_i2c_driver);
906 MODULE_AUTHOR("Daniel Stone");
907 MODULE_DESCRIPTION("LM8323 keypad driver");
908 MODULE_LICENSE("GPL");
910 module_init(lm8323_init);
911 module_exit(lm8323_exit);