2 * lp5523.c - LP5523 LED Driver
4 * Copyright (C) 2010 Nokia Corporation
6 * Contact: Samu Onkalo <samu.p.onkalo@nokia.com>
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * version 2 as published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
23 #include <linux/module.h>
24 #include <linux/init.h>
25 #include <linux/i2c.h>
26 #include <linux/mutex.h>
27 #include <linux/gpio.h>
28 #include <linux/interrupt.h>
29 #include <linux/delay.h>
30 #include <linux/ctype.h>
31 #include <linux/spinlock.h>
32 #include <linux/wait.h>
33 #include <linux/leds.h>
34 #include <linux/leds-lp5523.h>
35 #include <linux/workqueue.h>
36 #include <linux/slab.h>
38 #define LP5523_REG_ENABLE 0x00
39 #define LP5523_REG_OP_MODE 0x01
40 #define LP5523_REG_RATIOMETRIC_MSB 0x02
41 #define LP5523_REG_RATIOMETRIC_LSB 0x03
42 #define LP5523_REG_ENABLE_LEDS_MSB 0x04
43 #define LP5523_REG_ENABLE_LEDS_LSB 0x05
44 #define LP5523_REG_LED_CNTRL_BASE 0x06
45 #define LP5523_REG_LED_PWM_BASE 0x16
46 #define LP5523_REG_LED_CURRENT_BASE 0x26
47 #define LP5523_REG_CONFIG 0x36
48 #define LP5523_REG_CHANNEL1_PC 0x37
49 #define LP5523_REG_CHANNEL2_PC 0x38
50 #define LP5523_REG_CHANNEL3_PC 0x39
51 #define LP5523_REG_STATUS 0x3a
52 #define LP5523_REG_GPO 0x3b
53 #define LP5523_REG_VARIABLE 0x3c
54 #define LP5523_REG_RESET 0x3d
55 #define LP5523_REG_TEMP_CTRL 0x3e
56 #define LP5523_REG_TEMP_READ 0x3f
57 #define LP5523_REG_TEMP_WRITE 0x40
58 #define LP5523_REG_LED_TEST_CTRL 0x41
59 #define LP5523_REG_LED_TEST_ADC 0x42
60 #define LP5523_REG_ENG1_VARIABLE 0x45
61 #define LP5523_REG_ENG2_VARIABLE 0x46
62 #define LP5523_REG_ENG3_VARIABLE 0x47
63 #define LP5523_REG_MASTER_FADER1 0x48
64 #define LP5523_REG_MASTER_FADER2 0x49
65 #define LP5523_REG_MASTER_FADER3 0x4a
66 #define LP5523_REG_CH1_PROG_START 0x4c
67 #define LP5523_REG_CH2_PROG_START 0x4d
68 #define LP5523_REG_CH3_PROG_START 0x4e
69 #define LP5523_REG_PROG_PAGE_SEL 0x4f
70 #define LP5523_REG_PROG_MEM 0x50
72 #define LP5523_CMD_LOAD 0x15 /* 00010101 */
73 #define LP5523_CMD_RUN 0x2a /* 00101010 */
74 #define LP5523_CMD_DISABLED 0x00 /* 00000000 */
76 #define LP5523_ENABLE 0x40
77 #define LP5523_AUTO_INC 0x40
78 #define LP5523_PWR_SAVE 0x20
79 #define LP5523_PWM_PWR_SAVE 0x04
80 #define LP5523_CP_1 0x08
81 #define LP5523_CP_1_5 0x10
82 #define LP5523_CP_AUTO 0x18
83 #define LP5523_INT_CLK 0x01
84 #define LP5523_AUTO_CLK 0x02
85 #define LP5523_EN_LEDTEST 0x80
86 #define LP5523_LEDTEST_DONE 0x80
88 #define LP5523_DEFAULT_CURRENT 50 /* microAmps */
89 #define LP5523_PROGRAM_LENGTH 32 /* in bytes */
90 #define LP5523_PROGRAM_PAGES 6
91 #define LP5523_ADC_SHORTCIRC_LIM 80
94 #define LP5523_ENGINES 3
96 #define LP5523_ENG_MASK_BASE 0x30 /* 00110000 */
98 #define LP5523_ENG_STATUS_MASK 0x07 /* 00000111 */
100 #define LP5523_IRQ_FLAGS IRQF_TRIGGER_FALLING
102 #define LP5523_EXT_CLK_USED 0x08
104 #define LED_ACTIVE(mux, led) (!!(mux & (0x0001 << led)))
105 #define SHIFT_MASK(id) (((id) - 1) * 2)
107 enum lp5523_chip_id
{
112 struct lp5523_engine
{
126 struct led_classdev cdev
;
127 struct work_struct brightness_work
;
132 struct mutex lock
; /* Serialize control */
133 struct i2c_client
*client
;
134 struct lp5523_engine engines
[LP5523_ENGINES
];
135 struct lp5523_led leds
[LP5523_LEDS
];
136 struct lp5523_platform_data
*pdata
;
141 static inline struct lp5523_led
*cdev_to_led(struct led_classdev
*cdev
)
143 return container_of(cdev
, struct lp5523_led
, cdev
);
146 static inline struct lp5523_chip
*engine_to_lp5523(struct lp5523_engine
*engine
)
148 return container_of(engine
, struct lp5523_chip
,
149 engines
[engine
->id
- 1]);
152 static inline struct lp5523_chip
*led_to_lp5523(struct lp5523_led
*led
)
154 return container_of(led
, struct lp5523_chip
,
158 static void lp5523_set_mode(struct lp5523_engine
*engine
, u8 mode
);
159 static int lp5523_set_engine_mode(struct lp5523_engine
*engine
, u8 mode
);
160 static int lp5523_load_program(struct lp5523_engine
*engine
, const u8
*pattern
);
162 static void lp5523_led_brightness_work(struct work_struct
*work
);
164 static int lp5523_write(struct i2c_client
*client
, u8 reg
, u8 value
)
166 return i2c_smbus_write_byte_data(client
, reg
, value
);
169 static int lp5523_read(struct i2c_client
*client
, u8 reg
, u8
*buf
)
171 s32 ret
= i2c_smbus_read_byte_data(client
, reg
);
180 static int lp5523_detect(struct i2c_client
*client
)
185 ret
= lp5523_write(client
, LP5523_REG_ENABLE
, LP5523_ENABLE
);
188 ret
= lp5523_read(client
, LP5523_REG_ENABLE
, &buf
);
197 static int lp5523_configure(struct i2c_client
*client
)
199 struct lp5523_chip
*chip
= i2c_get_clientdata(client
);
203 /* one pattern per engine setting led mux start and stop addresses */
204 static const u8 pattern
[][LP5523_PROGRAM_LENGTH
] = {
205 { 0x9c, 0x30, 0x9c, 0xb0, 0x9d, 0x80, 0xd8, 0x00, 0},
206 { 0x9c, 0x40, 0x9c, 0xc0, 0x9d, 0x80, 0xd8, 0x00, 0},
207 { 0x9c, 0x50, 0x9c, 0xd0, 0x9d, 0x80, 0xd8, 0x00, 0},
210 ret
|= lp5523_write(client
, LP5523_REG_ENABLE
, LP5523_ENABLE
);
211 /* Chip startup time is 500 us, 1 - 2 ms gives some margin */
212 usleep_range(1000, 2000);
214 ret
|= lp5523_write(client
, LP5523_REG_CONFIG
,
215 LP5523_AUTO_INC
| LP5523_PWR_SAVE
|
216 LP5523_CP_AUTO
| LP5523_AUTO_CLK
|
217 LP5523_PWM_PWR_SAVE
);
219 /* turn on all leds */
220 ret
|= lp5523_write(client
, LP5523_REG_ENABLE_LEDS_MSB
, 0x01);
221 ret
|= lp5523_write(client
, LP5523_REG_ENABLE_LEDS_LSB
, 0xff);
223 /* hardcode 32 bytes of memory for each engine from program memory */
224 ret
|= lp5523_write(client
, LP5523_REG_CH1_PROG_START
, 0x00);
225 ret
|= lp5523_write(client
, LP5523_REG_CH2_PROG_START
, 0x10);
226 ret
|= lp5523_write(client
, LP5523_REG_CH3_PROG_START
, 0x20);
228 /* write led mux address space for each channel */
229 ret
|= lp5523_load_program(&chip
->engines
[0], pattern
[0]);
230 ret
|= lp5523_load_program(&chip
->engines
[1], pattern
[1]);
231 ret
|= lp5523_load_program(&chip
->engines
[2], pattern
[2]);
234 dev_err(&client
->dev
, "could not load mux programs\n");
238 /* set all engines exec state and mode to run 00101010 */
239 ret
|= lp5523_write(client
, LP5523_REG_ENABLE
,
240 (LP5523_CMD_RUN
| LP5523_ENABLE
));
242 ret
|= lp5523_write(client
, LP5523_REG_OP_MODE
, LP5523_CMD_RUN
);
245 dev_err(&client
->dev
, "could not start mux programs\n");
249 /* Let the programs run for couple of ms and check the engine status */
250 usleep_range(3000, 6000);
251 lp5523_read(client
, LP5523_REG_STATUS
, &status
);
252 status
&= LP5523_ENG_STATUS_MASK
;
254 if (status
== LP5523_ENG_STATUS_MASK
) {
255 dev_dbg(&client
->dev
, "all engines configured\n");
257 dev_info(&client
->dev
, "status == %x\n", status
);
258 dev_err(&client
->dev
, "cound not configure LED engine\n");
262 dev_info(&client
->dev
, "disabling engines\n");
264 ret
|= lp5523_write(client
, LP5523_REG_OP_MODE
, LP5523_CMD_DISABLED
);
269 static int lp5523_set_engine_mode(struct lp5523_engine
*engine
, u8 mode
)
271 struct lp5523_chip
*chip
= engine_to_lp5523(engine
);
272 struct i2c_client
*client
= chip
->client
;
276 ret
= lp5523_read(client
, LP5523_REG_OP_MODE
, &engine_state
);
280 engine_state
&= ~(engine
->engine_mask
);
282 /* set mode only for this engine */
283 mode
&= engine
->engine_mask
;
285 engine_state
|= mode
;
287 ret
|= lp5523_write(client
, LP5523_REG_OP_MODE
, engine_state
);
292 static int lp5523_load_mux(struct lp5523_engine
*engine
, u16 mux
)
294 struct lp5523_chip
*chip
= engine_to_lp5523(engine
);
295 struct i2c_client
*client
= chip
->client
;
298 ret
|= lp5523_set_engine_mode(engine
, LP5523_CMD_LOAD
);
300 ret
|= lp5523_write(client
, LP5523_REG_PROG_PAGE_SEL
, engine
->mux_page
);
301 ret
|= lp5523_write(client
, LP5523_REG_PROG_MEM
,
303 ret
|= lp5523_write(client
, LP5523_REG_PROG_MEM
+ 1, (u8
)(mux
));
304 engine
->led_mux
= mux
;
309 static int lp5523_load_program(struct lp5523_engine
*engine
, const u8
*pattern
)
311 struct lp5523_chip
*chip
= engine_to_lp5523(engine
);
312 struct i2c_client
*client
= chip
->client
;
316 ret
|= lp5523_set_engine_mode(engine
, LP5523_CMD_LOAD
);
318 ret
|= lp5523_write(client
, LP5523_REG_PROG_PAGE_SEL
,
320 ret
|= i2c_smbus_write_i2c_block_data(client
, LP5523_REG_PROG_MEM
,
321 LP5523_PROGRAM_LENGTH
, pattern
);
326 static int lp5523_run_program(struct lp5523_engine
*engine
)
328 struct lp5523_chip
*chip
= engine_to_lp5523(engine
);
329 struct i2c_client
*client
= chip
->client
;
332 ret
= lp5523_write(client
, LP5523_REG_ENABLE
,
333 LP5523_CMD_RUN
| LP5523_ENABLE
);
337 ret
= lp5523_set_engine_mode(engine
, LP5523_CMD_RUN
);
342 static int lp5523_mux_parse(const char *buf
, u16
*mux
, size_t len
)
347 len
= min_t(int, len
, LP5523_LEDS
);
348 for (i
= 0; i
< len
; i
++) {
367 static void lp5523_mux_to_array(u16 led_mux
, char *array
)
370 for (i
= 0; i
< LP5523_LEDS
; i
++)
371 pos
+= sprintf(array
+ pos
, "%x", LED_ACTIVE(led_mux
, i
));
376 /*--------------------------------------------------------------*/
377 /* Sysfs interface */
378 /*--------------------------------------------------------------*/
380 static ssize_t
show_engine_leds(struct device
*dev
,
381 struct device_attribute
*attr
,
384 struct i2c_client
*client
= to_i2c_client(dev
);
385 struct lp5523_chip
*chip
= i2c_get_clientdata(client
);
386 char mux
[LP5523_LEDS
+ 1];
388 lp5523_mux_to_array(chip
->engines
[nr
- 1].led_mux
, mux
);
390 return sprintf(buf
, "%s\n", mux
);
393 #define show_leds(nr) \
394 static ssize_t show_engine##nr##_leds(struct device *dev, \
395 struct device_attribute *attr, \
398 return show_engine_leds(dev, attr, buf, nr); \
404 static ssize_t
store_engine_leds(struct device
*dev
,
405 struct device_attribute
*attr
,
406 const char *buf
, size_t len
, int nr
)
408 struct i2c_client
*client
= to_i2c_client(dev
);
409 struct lp5523_chip
*chip
= i2c_get_clientdata(client
);
413 if (lp5523_mux_parse(buf
, &mux
, len
))
416 mutex_lock(&chip
->lock
);
418 if (chip
->engines
[nr
- 1].mode
!= LP5523_CMD_LOAD
)
421 if (lp5523_load_mux(&chip
->engines
[nr
- 1], mux
))
426 mutex_unlock(&chip
->lock
);
430 #define store_leds(nr) \
431 static ssize_t store_engine##nr##_leds(struct device *dev, \
432 struct device_attribute *attr, \
433 const char *buf, size_t len) \
435 return store_engine_leds(dev, attr, buf, len, nr); \
441 static ssize_t
lp5523_selftest(struct device
*dev
,
442 struct device_attribute
*attr
,
445 struct i2c_client
*client
= to_i2c_client(dev
);
446 struct lp5523_chip
*chip
= i2c_get_clientdata(client
);
451 mutex_lock(&chip
->lock
);
453 ret
= lp5523_read(chip
->client
, LP5523_REG_STATUS
, &status
);
457 /* Check that ext clock is really in use if requested */
458 if ((chip
->pdata
) && (chip
->pdata
->clock_mode
== LP5523_CLOCK_EXT
))
459 if ((status
& LP5523_EXT_CLK_USED
) == 0)
462 /* Measure VDD (i.e. VBAT) first (channel 16 corresponds to VDD) */
463 lp5523_write(chip
->client
, LP5523_REG_LED_TEST_CTRL
,
464 LP5523_EN_LEDTEST
| 16);
465 usleep_range(3000, 6000); /* ADC conversion time is typically 2.7 ms */
466 ret
= lp5523_read(chip
->client
, LP5523_REG_STATUS
, &status
);
467 if (!(status
& LP5523_LEDTEST_DONE
))
468 usleep_range(3000, 6000); /* Was not ready. Wait little bit */
470 ret
|= lp5523_read(chip
->client
, LP5523_REG_LED_TEST_ADC
, &vdd
);
471 vdd
--; /* There may be some fluctuation in measurement */
473 for (i
= 0; i
< LP5523_LEDS
; i
++) {
474 /* Skip non-existing channels */
475 if (chip
->pdata
->led_config
[i
].led_current
== 0)
478 /* Set default current */
479 lp5523_write(chip
->client
,
480 LP5523_REG_LED_CURRENT_BASE
+ i
,
481 chip
->pdata
->led_config
[i
].led_current
);
483 lp5523_write(chip
->client
, LP5523_REG_LED_PWM_BASE
+ i
, 0xff);
484 /* let current stabilize 2 - 4ms before measurements start */
485 usleep_range(2000, 4000);
486 lp5523_write(chip
->client
,
487 LP5523_REG_LED_TEST_CTRL
,
488 LP5523_EN_LEDTEST
| i
);
489 /* ADC conversion time is 2.7 ms typically */
490 usleep_range(3000, 6000);
491 ret
= lp5523_read(chip
->client
, LP5523_REG_STATUS
, &status
);
492 if (!(status
& LP5523_LEDTEST_DONE
))
493 usleep_range(3000, 6000);/* Was not ready. Wait. */
494 ret
|= lp5523_read(chip
->client
, LP5523_REG_LED_TEST_ADC
, &adc
);
496 if (adc
>= vdd
|| adc
< LP5523_ADC_SHORTCIRC_LIM
)
497 pos
+= sprintf(buf
+ pos
, "LED %d FAIL\n", i
);
499 lp5523_write(chip
->client
, LP5523_REG_LED_PWM_BASE
+ i
, 0x00);
501 /* Restore current */
502 lp5523_write(chip
->client
,
503 LP5523_REG_LED_CURRENT_BASE
+ i
,
504 chip
->leds
[led
].led_current
);
508 pos
= sprintf(buf
, "OK\n");
511 pos
= sprintf(buf
, "FAIL\n");
514 mutex_unlock(&chip
->lock
);
519 static void lp5523_set_brightness(struct led_classdev
*cdev
,
520 enum led_brightness brightness
)
522 struct lp5523_led
*led
= cdev_to_led(cdev
);
524 led
->brightness
= (u8
)brightness
;
526 schedule_work(&led
->brightness_work
);
529 static void lp5523_led_brightness_work(struct work_struct
*work
)
531 struct lp5523_led
*led
= container_of(work
,
534 struct lp5523_chip
*chip
= led_to_lp5523(led
);
535 struct i2c_client
*client
= chip
->client
;
537 mutex_lock(&chip
->lock
);
539 lp5523_write(client
, LP5523_REG_LED_PWM_BASE
+ led
->chan_nr
,
542 mutex_unlock(&chip
->lock
);
545 static int lp5523_do_store_load(struct lp5523_engine
*engine
,
546 const char *buf
, size_t len
)
548 struct lp5523_chip
*chip
= engine_to_lp5523(engine
);
549 struct i2c_client
*client
= chip
->client
;
550 int ret
, nrchars
, offset
= 0, i
= 0;
553 u8 pattern
[LP5523_PROGRAM_LENGTH
] = {0};
555 if (engine
->mode
!= LP5523_CMD_LOAD
)
558 while ((offset
< len
- 1) && (i
< LP5523_PROGRAM_LENGTH
)) {
559 /* separate sscanfs because length is working only for %s */
560 ret
= sscanf(buf
+ offset
, "%2s%n ", c
, &nrchars
);
561 ret
= sscanf(c
, "%2x", &cmd
);
564 pattern
[i
] = (u8
)cmd
;
570 /* Each instruction is 16bit long. Check that length is even */
574 mutex_lock(&chip
->lock
);
575 ret
= lp5523_load_program(engine
, pattern
);
576 mutex_unlock(&chip
->lock
);
579 dev_err(&client
->dev
, "failed loading pattern\n");
585 dev_err(&client
->dev
, "wrong pattern format\n");
589 static ssize_t
store_engine_load(struct device
*dev
,
590 struct device_attribute
*attr
,
591 const char *buf
, size_t len
, int nr
)
593 struct i2c_client
*client
= to_i2c_client(dev
);
594 struct lp5523_chip
*chip
= i2c_get_clientdata(client
);
595 return lp5523_do_store_load(&chip
->engines
[nr
- 1], buf
, len
);
598 #define store_load(nr) \
599 static ssize_t store_engine##nr##_load(struct device *dev, \
600 struct device_attribute *attr, \
601 const char *buf, size_t len) \
603 return store_engine_load(dev, attr, buf, len, nr); \
609 static ssize_t
show_engine_mode(struct device
*dev
,
610 struct device_attribute
*attr
,
613 struct i2c_client
*client
= to_i2c_client(dev
);
614 struct lp5523_chip
*chip
= i2c_get_clientdata(client
);
615 switch (chip
->engines
[nr
- 1].mode
) {
617 return sprintf(buf
, "run\n");
618 case LP5523_CMD_LOAD
:
619 return sprintf(buf
, "load\n");
620 case LP5523_CMD_DISABLED
:
621 return sprintf(buf
, "disabled\n");
623 return sprintf(buf
, "disabled\n");
627 #define show_mode(nr) \
628 static ssize_t show_engine##nr##_mode(struct device *dev, \
629 struct device_attribute *attr, \
632 return show_engine_mode(dev, attr, buf, nr); \
638 static ssize_t
store_engine_mode(struct device
*dev
,
639 struct device_attribute
*attr
,
640 const char *buf
, size_t len
, int nr
)
642 struct i2c_client
*client
= to_i2c_client(dev
);
643 struct lp5523_chip
*chip
= i2c_get_clientdata(client
);
644 struct lp5523_engine
*engine
= &chip
->engines
[nr
- 1];
645 mutex_lock(&chip
->lock
);
647 if (!strncmp(buf
, "run", 3))
648 lp5523_set_mode(engine
, LP5523_CMD_RUN
);
649 else if (!strncmp(buf
, "load", 4))
650 lp5523_set_mode(engine
, LP5523_CMD_LOAD
);
651 else if (!strncmp(buf
, "disabled", 8))
652 lp5523_set_mode(engine
, LP5523_CMD_DISABLED
);
654 mutex_unlock(&chip
->lock
);
658 #define store_mode(nr) \
659 static ssize_t store_engine##nr##_mode(struct device *dev, \
660 struct device_attribute *attr, \
661 const char *buf, size_t len) \
663 return store_engine_mode(dev, attr, buf, len, nr); \
669 static ssize_t
show_max_current(struct device
*dev
,
670 struct device_attribute
*attr
,
673 struct led_classdev
*led_cdev
= dev_get_drvdata(dev
);
674 struct lp5523_led
*led
= cdev_to_led(led_cdev
);
676 return sprintf(buf
, "%d\n", led
->max_current
);
679 static ssize_t
show_current(struct device
*dev
,
680 struct device_attribute
*attr
,
683 struct led_classdev
*led_cdev
= dev_get_drvdata(dev
);
684 struct lp5523_led
*led
= cdev_to_led(led_cdev
);
686 return sprintf(buf
, "%d\n", led
->led_current
);
689 static ssize_t
store_current(struct device
*dev
,
690 struct device_attribute
*attr
,
691 const char *buf
, size_t len
)
693 struct led_classdev
*led_cdev
= dev_get_drvdata(dev
);
694 struct lp5523_led
*led
= cdev_to_led(led_cdev
);
695 struct lp5523_chip
*chip
= led_to_lp5523(led
);
699 if (strict_strtoul(buf
, 0, &curr
))
702 if (curr
> led
->max_current
)
705 mutex_lock(&chip
->lock
);
706 ret
= lp5523_write(chip
->client
,
707 LP5523_REG_LED_CURRENT_BASE
+ led
->chan_nr
,
709 mutex_unlock(&chip
->lock
);
714 led
->led_current
= (u8
)curr
;
719 /* led class device attributes */
720 static DEVICE_ATTR(led_current
, S_IRUGO
| S_IWUSR
, show_current
, store_current
);
721 static DEVICE_ATTR(max_current
, S_IRUGO
, show_max_current
, NULL
);
723 static struct attribute
*lp5523_led_attributes
[] = {
724 &dev_attr_led_current
.attr
,
725 &dev_attr_max_current
.attr
,
729 static struct attribute_group lp5523_led_attribute_group
= {
730 .attrs
= lp5523_led_attributes
733 /* device attributes */
734 static DEVICE_ATTR(engine1_mode
, S_IRUGO
| S_IWUSR
,
735 show_engine1_mode
, store_engine1_mode
);
736 static DEVICE_ATTR(engine2_mode
, S_IRUGO
| S_IWUSR
,
737 show_engine2_mode
, store_engine2_mode
);
738 static DEVICE_ATTR(engine3_mode
, S_IRUGO
| S_IWUSR
,
739 show_engine3_mode
, store_engine3_mode
);
740 static DEVICE_ATTR(engine1_leds
, S_IRUGO
| S_IWUSR
,
741 show_engine1_leds
, store_engine1_leds
);
742 static DEVICE_ATTR(engine2_leds
, S_IRUGO
| S_IWUSR
,
743 show_engine2_leds
, store_engine2_leds
);
744 static DEVICE_ATTR(engine3_leds
, S_IRUGO
| S_IWUSR
,
745 show_engine3_leds
, store_engine3_leds
);
746 static DEVICE_ATTR(engine1_load
, S_IWUSR
, NULL
, store_engine1_load
);
747 static DEVICE_ATTR(engine2_load
, S_IWUSR
, NULL
, store_engine2_load
);
748 static DEVICE_ATTR(engine3_load
, S_IWUSR
, NULL
, store_engine3_load
);
749 static DEVICE_ATTR(selftest
, S_IRUGO
, lp5523_selftest
, NULL
);
751 static struct attribute
*lp5523_attributes
[] = {
752 &dev_attr_engine1_mode
.attr
,
753 &dev_attr_engine2_mode
.attr
,
754 &dev_attr_engine3_mode
.attr
,
755 &dev_attr_selftest
.attr
,
756 &dev_attr_engine1_load
.attr
,
757 &dev_attr_engine1_leds
.attr
,
758 &dev_attr_engine2_load
.attr
,
759 &dev_attr_engine2_leds
.attr
,
760 &dev_attr_engine3_load
.attr
,
761 &dev_attr_engine3_leds
.attr
,
765 static const struct attribute_group lp5523_group
= {
766 .attrs
= lp5523_attributes
,
769 static int lp5523_register_sysfs(struct i2c_client
*client
)
771 struct device
*dev
= &client
->dev
;
774 ret
= sysfs_create_group(&dev
->kobj
, &lp5523_group
);
781 static void lp5523_unregister_sysfs(struct i2c_client
*client
)
783 struct lp5523_chip
*chip
= i2c_get_clientdata(client
);
784 struct device
*dev
= &client
->dev
;
787 sysfs_remove_group(&dev
->kobj
, &lp5523_group
);
789 for (i
= 0; i
< chip
->num_leds
; i
++)
790 sysfs_remove_group(&chip
->leds
[i
].cdev
.dev
->kobj
,
791 &lp5523_led_attribute_group
);
794 /*--------------------------------------------------------------*/
795 /* Set chip operating mode */
796 /*--------------------------------------------------------------*/
797 static void lp5523_set_mode(struct lp5523_engine
*engine
, u8 mode
)
799 /* if in that mode already do nothing, except for run */
800 if (mode
== engine
->mode
&& mode
!= LP5523_CMD_RUN
)
805 lp5523_run_program(engine
);
807 case LP5523_CMD_LOAD
:
808 lp5523_set_engine_mode(engine
, LP5523_CMD_DISABLED
);
809 lp5523_set_engine_mode(engine
, LP5523_CMD_LOAD
);
811 case LP5523_CMD_DISABLED
:
812 lp5523_set_engine_mode(engine
, LP5523_CMD_DISABLED
);
821 /*--------------------------------------------------------------*/
822 /* Probe, Attach, Remove */
823 /*--------------------------------------------------------------*/
824 static int __init
lp5523_init_engine(struct lp5523_engine
*engine
, int id
)
826 if (id
< 1 || id
> LP5523_ENGINES
)
829 engine
->engine_mask
= LP5523_ENG_MASK_BASE
>> SHIFT_MASK(id
);
830 engine
->prog_page
= id
- 1;
831 engine
->mux_page
= id
+ 2;
836 static int __devinit
lp5523_init_led(struct lp5523_led
*led
, struct device
*dev
,
837 int chan
, struct lp5523_platform_data
*pdata
,
838 const char *chip_name
)
843 if (chan
>= LP5523_LEDS
)
846 if (pdata
->led_config
[chan
].led_current
) {
847 led
->led_current
= pdata
->led_config
[chan
].led_current
;
848 led
->max_current
= pdata
->led_config
[chan
].max_current
;
849 led
->chan_nr
= pdata
->led_config
[chan
].chan_nr
;
851 if (led
->chan_nr
>= LP5523_LEDS
) {
852 dev_err(dev
, "Use channel numbers between 0 and %d\n",
857 if (pdata
->led_config
[chan
].name
) {
858 led
->cdev
.name
= pdata
->led_config
[chan
].name
;
860 snprintf(name
, sizeof(name
), "%s:channel%d",
861 pdata
->label
? : chip_name
, chan
);
862 led
->cdev
.name
= name
;
865 led
->cdev
.brightness_set
= lp5523_set_brightness
;
866 res
= led_classdev_register(dev
, &led
->cdev
);
868 dev_err(dev
, "couldn't register led on channel %d\n",
872 res
= sysfs_create_group(&led
->cdev
.dev
->kobj
,
873 &lp5523_led_attribute_group
);
875 dev_err(dev
, "couldn't register current attribute\n");
876 led_classdev_unregister(&led
->cdev
);
880 led
->led_current
= 0;
885 static int __devinit
lp5523_probe(struct i2c_client
*client
,
886 const struct i2c_device_id
*id
)
888 struct lp5523_chip
*chip
;
889 struct lp5523_platform_data
*pdata
;
892 chip
= devm_kzalloc(&client
->dev
, sizeof(*chip
), GFP_KERNEL
);
896 i2c_set_clientdata(client
, chip
);
897 chip
->client
= client
;
899 pdata
= client
->dev
.platform_data
;
902 dev_err(&client
->dev
, "no platform data\n");
906 mutex_init(&chip
->lock
);
910 if (pdata
->setup_resources
) {
911 ret
= pdata
->setup_resources();
918 usleep_range(1000, 2000); /* Keep enable down at least 1ms */
920 usleep_range(1000, 2000); /* 500us abs min. */
923 lp5523_write(client
, LP5523_REG_RESET
, 0xff);
924 usleep_range(10000, 20000); /*
925 * Exact value is not available. 10 - 20ms
926 * appears to be enough for reset.
928 ret
= lp5523_detect(client
);
932 dev_info(&client
->dev
, "%s Programmable led chip found\n", id
->name
);
934 /* Initialize engines */
935 for (i
= 0; i
< ARRAY_SIZE(chip
->engines
); i
++) {
936 ret
= lp5523_init_engine(&chip
->engines
[i
], i
+ 1);
938 dev_err(&client
->dev
, "error initializing engine\n");
942 ret
= lp5523_configure(client
);
944 dev_err(&client
->dev
, "error configuring chip\n");
948 /* Initialize leds */
949 chip
->num_channels
= pdata
->num_channels
;
952 for (i
= 0; i
< pdata
->num_channels
; i
++) {
953 /* Do not initialize channels that are not connected */
954 if (pdata
->led_config
[i
].led_current
== 0)
957 INIT_WORK(&chip
->leds
[led
].brightness_work
,
958 lp5523_led_brightness_work
);
960 ret
= lp5523_init_led(&chip
->leds
[led
], &client
->dev
, i
, pdata
,
963 dev_err(&client
->dev
, "error initializing leds\n");
968 chip
->leds
[led
].id
= led
;
969 /* Set LED current */
971 LP5523_REG_LED_CURRENT_BASE
+ chip
->leds
[led
].chan_nr
,
972 chip
->leds
[led
].led_current
);
977 ret
= lp5523_register_sysfs(client
);
979 dev_err(&client
->dev
, "registering sysfs failed\n");
984 for (i
= 0; i
< chip
->num_leds
; i
++) {
985 led_classdev_unregister(&chip
->leds
[i
].cdev
);
986 flush_work(&chip
->leds
[i
].brightness_work
);
991 if (pdata
->release_resources
)
992 pdata
->release_resources();
996 static int lp5523_remove(struct i2c_client
*client
)
998 struct lp5523_chip
*chip
= i2c_get_clientdata(client
);
1001 /* Disable engine mode */
1002 lp5523_write(client
, LP5523_REG_OP_MODE
, LP5523_CMD_DISABLED
);
1004 lp5523_unregister_sysfs(client
);
1006 for (i
= 0; i
< chip
->num_leds
; i
++) {
1007 led_classdev_unregister(&chip
->leds
[i
].cdev
);
1008 flush_work(&chip
->leds
[i
].brightness_work
);
1011 if (chip
->pdata
->enable
)
1012 chip
->pdata
->enable(0);
1013 if (chip
->pdata
->release_resources
)
1014 chip
->pdata
->release_resources();
1018 static const struct i2c_device_id lp5523_id
[] = {
1019 { "lp5523", LP5523
},
1020 { "lp55231", LP55231
},
1024 MODULE_DEVICE_TABLE(i2c
, lp5523_id
);
1026 static struct i2c_driver lp5523_driver
= {
1030 .probe
= lp5523_probe
,
1031 .remove
= lp5523_remove
,
1032 .id_table
= lp5523_id
,
1035 module_i2c_driver(lp5523_driver
);
1037 MODULE_AUTHOR("Mathias Nyman <mathias.nyman@nokia.com>");
1038 MODULE_DESCRIPTION("LP5523 LED engine");
1039 MODULE_LICENSE("GPL");