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 struct lp5523_engine
{
108 const struct attribute_group
*attributes
;
122 struct led_classdev cdev
;
123 struct work_struct brightness_work
;
128 struct mutex lock
; /* Serialize control */
129 struct i2c_client
*client
;
130 struct lp5523_engine engines
[LP5523_ENGINES
];
131 struct lp5523_led leds
[LP5523_LEDS
];
132 struct lp5523_platform_data
*pdata
;
137 #define cdev_to_led(c) container_of(c, struct lp5523_led, cdev)
139 static struct lp5523_chip
*engine_to_lp5523(struct lp5523_engine
*engine
)
141 return container_of(engine
, struct lp5523_chip
,
142 engines
[engine
->id
- 1]);
145 static struct lp5523_chip
*led_to_lp5523(struct lp5523_led
*led
)
147 return container_of(led
, struct lp5523_chip
,
151 static int lp5523_set_mode(struct lp5523_engine
*engine
, u8 mode
);
152 static int lp5523_set_engine_mode(struct lp5523_engine
*engine
, u8 mode
);
153 static int lp5523_load_program(struct lp5523_engine
*engine
, u8
*pattern
);
155 static void lp5523_led_brightness_work(struct work_struct
*work
);
157 static int lp5523_write(struct i2c_client
*client
, u8 reg
, u8 value
)
159 return i2c_smbus_write_byte_data(client
, reg
, value
);
162 static int lp5523_read(struct i2c_client
*client
, u8 reg
, u8
*buf
)
164 s32 ret
= i2c_smbus_read_byte_data(client
, reg
);
173 static int lp5523_detect(struct i2c_client
*client
)
178 ret
= lp5523_write(client
, LP5523_REG_ENABLE
, 0x40);
181 ret
= lp5523_read(client
, LP5523_REG_ENABLE
, &buf
);
190 static int lp5523_configure(struct i2c_client
*client
)
192 struct lp5523_chip
*chip
= i2c_get_clientdata(client
);
196 /* one pattern per engine setting led mux start and stop addresses */
197 u8 pattern
[][LP5523_PROGRAM_LENGTH
] = {
198 { 0x9c, 0x30, 0x9c, 0xb0, 0x9d, 0x80, 0xd8, 0x00, 0},
199 { 0x9c, 0x40, 0x9c, 0xc0, 0x9d, 0x80, 0xd8, 0x00, 0},
200 { 0x9c, 0x50, 0x9c, 0xd0, 0x9d, 0x80, 0xd8, 0x00, 0},
203 lp5523_write(client
, LP5523_REG_RESET
, 0xff);
205 usleep_range(10000, 100000);
207 ret
|= lp5523_write(client
, LP5523_REG_ENABLE
, LP5523_ENABLE
);
208 /* Chip startup time after reset is 500 us */
209 usleep_range(1000, 10000);
211 ret
|= lp5523_write(client
, LP5523_REG_CONFIG
,
212 LP5523_AUTO_INC
| LP5523_PWR_SAVE
|
213 LP5523_CP_AUTO
| LP5523_AUTO_CLK
|
214 LP5523_PWM_PWR_SAVE
);
216 /* turn on all leds */
217 ret
|= lp5523_write(client
, LP5523_REG_ENABLE_LEDS_MSB
, 0x01);
218 ret
|= lp5523_write(client
, LP5523_REG_ENABLE_LEDS_LSB
, 0xff);
220 /* hardcode 32 bytes of memory for each engine from program memory */
221 ret
|= lp5523_write(client
, LP5523_REG_CH1_PROG_START
, 0x00);
222 ret
|= lp5523_write(client
, LP5523_REG_CH2_PROG_START
, 0x10);
223 ret
|= lp5523_write(client
, LP5523_REG_CH3_PROG_START
, 0x20);
225 /* write led mux address space for each channel */
226 ret
|= lp5523_load_program(&chip
->engines
[0], pattern
[0]);
227 ret
|= lp5523_load_program(&chip
->engines
[1], pattern
[1]);
228 ret
|= lp5523_load_program(&chip
->engines
[2], pattern
[2]);
231 dev_err(&client
->dev
, "could not load mux programs\n");
235 /* set all engines exec state and mode to run 00101010 */
236 ret
|= lp5523_write(client
, LP5523_REG_ENABLE
,
237 (LP5523_CMD_RUN
| LP5523_ENABLE
));
239 ret
|= lp5523_write(client
, LP5523_REG_OP_MODE
, LP5523_CMD_RUN
);
242 dev_err(&client
->dev
, "could not start mux programs\n");
246 /* Wait 3ms and check the engine status */
247 usleep_range(3000, 20000);
248 lp5523_read(client
, LP5523_REG_STATUS
, &status
);
249 status
&= LP5523_ENG_STATUS_MASK
;
251 if (status
== LP5523_ENG_STATUS_MASK
) {
252 dev_dbg(&client
->dev
, "all engines configured\n");
254 dev_info(&client
->dev
, "status == %x\n", status
);
255 dev_err(&client
->dev
, "cound not configure LED engine\n");
259 dev_info(&client
->dev
, "disabling engines\n");
261 ret
|= lp5523_write(client
, LP5523_REG_OP_MODE
, LP5523_CMD_DISABLED
);
266 static int lp5523_set_engine_mode(struct lp5523_engine
*engine
, u8 mode
)
268 struct lp5523_chip
*chip
= engine_to_lp5523(engine
);
269 struct i2c_client
*client
= chip
->client
;
273 ret
= lp5523_read(client
, LP5523_REG_OP_MODE
, &engine_state
);
277 engine_state
&= ~(engine
->engine_mask
);
279 /* set mode only for this engine */
280 mode
&= engine
->engine_mask
;
282 engine_state
|= mode
;
284 ret
|= lp5523_write(client
, LP5523_REG_OP_MODE
, engine_state
);
289 static int lp5523_load_mux(struct lp5523_engine
*engine
, u16 mux
)
291 struct lp5523_chip
*chip
= engine_to_lp5523(engine
);
292 struct i2c_client
*client
= chip
->client
;
295 ret
|= lp5523_set_engine_mode(engine
, LP5523_CMD_LOAD
);
297 ret
|= lp5523_write(client
, LP5523_REG_PROG_PAGE_SEL
, engine
->mux_page
);
298 ret
|= lp5523_write(client
, LP5523_REG_PROG_MEM
,
300 ret
|= lp5523_write(client
, LP5523_REG_PROG_MEM
+ 1, (u8
)(mux
));
301 engine
->led_mux
= mux
;
306 static int lp5523_load_program(struct lp5523_engine
*engine
, u8
*pattern
)
308 struct lp5523_chip
*chip
= engine_to_lp5523(engine
);
309 struct i2c_client
*client
= chip
->client
;
313 ret
|= lp5523_set_engine_mode(engine
, LP5523_CMD_LOAD
);
315 ret
|= lp5523_write(client
, LP5523_REG_PROG_PAGE_SEL
,
317 ret
|= i2c_smbus_write_i2c_block_data(client
, LP5523_REG_PROG_MEM
,
318 LP5523_PROGRAM_LENGTH
, pattern
);
323 static int lp5523_run_program(struct lp5523_engine
*engine
)
325 struct lp5523_chip
*chip
= engine_to_lp5523(engine
);
326 struct i2c_client
*client
= chip
->client
;
329 ret
= lp5523_write(client
, LP5523_REG_ENABLE
,
330 LP5523_CMD_RUN
| LP5523_ENABLE
);
334 ret
= lp5523_set_engine_mode(engine
, LP5523_CMD_RUN
);
339 static int lp5523_mux_parse(const char *buf
, u16
*mux
, size_t len
)
343 len
= len
< LP5523_LEDS
? len
: LP5523_LEDS
;
344 for (i
= 0; i
< len
; i
++) {
363 static void lp5523_mux_to_array(u16 led_mux
, char *array
)
366 for (i
= 0; i
< LP5523_LEDS
; i
++)
367 pos
+= sprintf(array
+ pos
, "%x", LED_ACTIVE(led_mux
, i
));
372 /*--------------------------------------------------------------*/
373 /* Sysfs interface */
374 /*--------------------------------------------------------------*/
376 static ssize_t
show_engine_leds(struct device
*dev
,
377 struct device_attribute
*attr
,
380 struct i2c_client
*client
= to_i2c_client(dev
);
381 struct lp5523_chip
*chip
= i2c_get_clientdata(client
);
382 char mux
[LP5523_LEDS
+ 1];
384 lp5523_mux_to_array(chip
->engines
[nr
- 1].led_mux
, mux
);
386 return sprintf(buf
, "%s\n", mux
);
389 #define show_leds(nr) \
390 static ssize_t show_engine##nr##_leds(struct device *dev, \
391 struct device_attribute *attr, \
394 return show_engine_leds(dev, attr, buf, nr); \
400 static ssize_t
store_engine_leds(struct device
*dev
,
401 struct device_attribute
*attr
,
402 const char *buf
, size_t len
, int nr
)
404 struct i2c_client
*client
= to_i2c_client(dev
);
405 struct lp5523_chip
*chip
= i2c_get_clientdata(client
);
408 if (lp5523_mux_parse(buf
, &mux
, len
))
411 if (lp5523_load_mux(&chip
->engines
[nr
- 1], mux
))
417 #define store_leds(nr) \
418 static ssize_t store_engine##nr##_leds(struct device *dev, \
419 struct device_attribute *attr, \
420 const char *buf, size_t len) \
422 return store_engine_leds(dev, attr, buf, len, nr); \
428 static ssize_t
lp5523_selftest(struct device
*dev
,
429 struct device_attribute
*attr
,
432 struct i2c_client
*client
= to_i2c_client(dev
);
433 struct lp5523_chip
*chip
= i2c_get_clientdata(client
);
438 mutex_lock(&chip
->lock
);
440 ret
= lp5523_read(chip
->client
, LP5523_REG_STATUS
, &status
);
444 /* Check that ext clock is really in use if requested */
445 if ((chip
->pdata
) && (chip
->pdata
->clock_mode
== LP5523_CLOCK_EXT
))
446 if ((status
& LP5523_EXT_CLK_USED
) == 0)
449 /* Measure VDD (i.e. VBAT) first (channel 16 corresponds to VDD) */
450 lp5523_write(chip
->client
, LP5523_REG_LED_TEST_CTRL
,
451 LP5523_EN_LEDTEST
| 16);
452 usleep_range(3000, 10000);
453 ret
= lp5523_read(chip
->client
, LP5523_REG_STATUS
, &status
);
454 if (!(status
& LP5523_LEDTEST_DONE
))
455 usleep_range(3000, 10000);
457 ret
|= lp5523_read(chip
->client
, LP5523_REG_LED_TEST_ADC
, &vdd
);
458 vdd
--; /* There may be some fluctuation in measurement */
460 for (i
= 0; i
< LP5523_LEDS
; i
++) {
461 /* Skip non-existing channels */
462 if (chip
->pdata
->led_config
[i
].led_current
== 0)
465 /* Set default current */
466 lp5523_write(chip
->client
,
467 LP5523_REG_LED_CURRENT_BASE
+ i
,
468 chip
->pdata
->led_config
[i
].led_current
);
470 lp5523_write(chip
->client
, LP5523_REG_LED_PWM_BASE
+ i
, 0xff);
471 /* let current stabilize 2ms before measurements start */
472 usleep_range(2000, 10000);
473 lp5523_write(chip
->client
,
474 LP5523_REG_LED_TEST_CTRL
,
475 LP5523_EN_LEDTEST
| i
);
476 /* ledtest takes 2.7ms */
477 usleep_range(3000, 10000);
478 ret
= lp5523_read(chip
->client
, LP5523_REG_STATUS
, &status
);
479 if (!(status
& LP5523_LEDTEST_DONE
))
480 usleep_range(3000, 10000);
481 ret
|= lp5523_read(chip
->client
, LP5523_REG_LED_TEST_ADC
, &adc
);
483 if (adc
>= vdd
|| adc
< LP5523_ADC_SHORTCIRC_LIM
)
484 pos
+= sprintf(buf
+ pos
, "LED %d FAIL\n", i
);
486 lp5523_write(chip
->client
, LP5523_REG_LED_PWM_BASE
+ i
, 0x00);
488 /* Restore current */
489 lp5523_write(chip
->client
,
490 LP5523_REG_LED_CURRENT_BASE
+ i
,
491 chip
->leds
[led
].led_current
);
495 pos
= sprintf(buf
, "OK\n");
498 pos
= sprintf(buf
, "FAIL\n");
501 mutex_unlock(&chip
->lock
);
506 static void lp5523_set_brightness(struct led_classdev
*cdev
,
507 enum led_brightness brightness
)
509 struct lp5523_led
*led
= cdev_to_led(cdev
);
511 led
->brightness
= (u8
)brightness
;
513 schedule_work(&led
->brightness_work
);
516 static void lp5523_led_brightness_work(struct work_struct
*work
)
518 struct lp5523_led
*led
= container_of(work
,
521 struct lp5523_chip
*chip
= led_to_lp5523(led
);
522 struct i2c_client
*client
= chip
->client
;
524 mutex_lock(&chip
->lock
);
526 lp5523_write(client
, LP5523_REG_LED_PWM_BASE
+ led
->chan_nr
,
529 mutex_unlock(&chip
->lock
);
532 static int lp5523_do_store_load(struct lp5523_engine
*engine
,
533 const char *buf
, size_t len
)
535 struct lp5523_chip
*chip
= engine_to_lp5523(engine
);
536 struct i2c_client
*client
= chip
->client
;
537 int ret
, nrchars
, offset
= 0, i
= 0;
540 u8 pattern
[LP5523_PROGRAM_LENGTH
] = {0};
542 while ((offset
< len
- 1) && (i
< LP5523_PROGRAM_LENGTH
)) {
543 /* separate sscanfs because length is working only for %s */
544 ret
= sscanf(buf
+ offset
, "%2s%n ", c
, &nrchars
);
545 ret
= sscanf(c
, "%2x", &cmd
);
548 pattern
[i
] = (u8
)cmd
;
554 /* Each instruction is 16bit long. Check that length is even */
558 mutex_lock(&chip
->lock
);
560 ret
= lp5523_load_program(engine
, pattern
);
561 mutex_unlock(&chip
->lock
);
564 dev_err(&client
->dev
, "failed loading pattern\n");
570 dev_err(&client
->dev
, "wrong pattern format\n");
574 static ssize_t
store_engine_load(struct device
*dev
,
575 struct device_attribute
*attr
,
576 const char *buf
, size_t len
, int nr
)
578 struct i2c_client
*client
= to_i2c_client(dev
);
579 struct lp5523_chip
*chip
= i2c_get_clientdata(client
);
580 return lp5523_do_store_load(&chip
->engines
[nr
- 1], buf
, len
);
583 #define store_load(nr) \
584 static ssize_t store_engine##nr##_load(struct device *dev, \
585 struct device_attribute *attr, \
586 const char *buf, size_t len) \
588 return store_engine_load(dev, attr, buf, len, nr); \
594 static ssize_t
show_engine_mode(struct device
*dev
,
595 struct device_attribute
*attr
,
598 struct i2c_client
*client
= to_i2c_client(dev
);
599 struct lp5523_chip
*chip
= i2c_get_clientdata(client
);
600 switch (chip
->engines
[nr
- 1].mode
) {
602 return sprintf(buf
, "run\n");
603 case LP5523_CMD_LOAD
:
604 return sprintf(buf
, "load\n");
605 case LP5523_CMD_DISABLED
:
606 return sprintf(buf
, "disabled\n");
608 return sprintf(buf
, "disabled\n");
612 #define show_mode(nr) \
613 static ssize_t show_engine##nr##_mode(struct device *dev, \
614 struct device_attribute *attr, \
617 return show_engine_mode(dev, attr, buf, nr); \
623 static ssize_t
store_engine_mode(struct device
*dev
,
624 struct device_attribute
*attr
,
625 const char *buf
, size_t len
, int nr
)
627 struct i2c_client
*client
= to_i2c_client(dev
);
628 struct lp5523_chip
*chip
= i2c_get_clientdata(client
);
629 struct lp5523_engine
*engine
= &chip
->engines
[nr
- 1];
630 mutex_lock(&chip
->lock
);
632 if (!strncmp(buf
, "run", 3))
633 lp5523_set_mode(engine
, LP5523_CMD_RUN
);
634 else if (!strncmp(buf
, "load", 4))
635 lp5523_set_mode(engine
, LP5523_CMD_LOAD
);
636 else if (!strncmp(buf
, "disabled", 8))
637 lp5523_set_mode(engine
, LP5523_CMD_DISABLED
);
639 mutex_unlock(&chip
->lock
);
643 #define store_mode(nr) \
644 static ssize_t store_engine##nr##_mode(struct device *dev, \
645 struct device_attribute *attr, \
646 const char *buf, size_t len) \
648 return store_engine_mode(dev, attr, buf, len, nr); \
654 static ssize_t
show_max_current(struct device
*dev
,
655 struct device_attribute
*attr
,
658 struct led_classdev
*led_cdev
= dev_get_drvdata(dev
);
659 struct lp5523_led
*led
= cdev_to_led(led_cdev
);
661 return sprintf(buf
, "%d\n", led
->max_current
);
664 static ssize_t
show_current(struct device
*dev
,
665 struct device_attribute
*attr
,
668 struct led_classdev
*led_cdev
= dev_get_drvdata(dev
);
669 struct lp5523_led
*led
= cdev_to_led(led_cdev
);
671 return sprintf(buf
, "%d\n", led
->led_current
);
674 static ssize_t
store_current(struct device
*dev
,
675 struct device_attribute
*attr
,
676 const char *buf
, size_t len
)
678 struct led_classdev
*led_cdev
= dev_get_drvdata(dev
);
679 struct lp5523_led
*led
= cdev_to_led(led_cdev
);
680 struct lp5523_chip
*chip
= led_to_lp5523(led
);
684 if (strict_strtoul(buf
, 0, &curr
))
687 if (curr
> led
->max_current
)
690 mutex_lock(&chip
->lock
);
691 ret
= lp5523_write(chip
->client
,
692 LP5523_REG_LED_CURRENT_BASE
+ led
->chan_nr
,
694 mutex_unlock(&chip
->lock
);
699 led
->led_current
= (u8
)curr
;
704 /* led class device attributes */
705 static DEVICE_ATTR(led_current
, S_IRUGO
| S_IWUGO
, show_current
, store_current
);
706 static DEVICE_ATTR(max_current
, S_IRUGO
, show_max_current
, NULL
);
708 static struct attribute
*lp5523_led_attributes
[] = {
709 &dev_attr_led_current
.attr
,
710 &dev_attr_max_current
.attr
,
714 static struct attribute_group lp5523_led_attribute_group
= {
715 .attrs
= lp5523_led_attributes
718 /* device attributes */
719 static DEVICE_ATTR(engine1_mode
, S_IRUGO
| S_IWUGO
,
720 show_engine1_mode
, store_engine1_mode
);
721 static DEVICE_ATTR(engine2_mode
, S_IRUGO
| S_IWUGO
,
722 show_engine2_mode
, store_engine2_mode
);
723 static DEVICE_ATTR(engine3_mode
, S_IRUGO
| S_IWUGO
,
724 show_engine3_mode
, store_engine3_mode
);
725 static DEVICE_ATTR(engine1_leds
, S_IRUGO
| S_IWUGO
,
726 show_engine1_leds
, store_engine1_leds
);
727 static DEVICE_ATTR(engine2_leds
, S_IRUGO
| S_IWUGO
,
728 show_engine2_leds
, store_engine2_leds
);
729 static DEVICE_ATTR(engine3_leds
, S_IRUGO
| S_IWUGO
,
730 show_engine3_leds
, store_engine3_leds
);
731 static DEVICE_ATTR(engine1_load
, S_IWUGO
, NULL
, store_engine1_load
);
732 static DEVICE_ATTR(engine2_load
, S_IWUGO
, NULL
, store_engine2_load
);
733 static DEVICE_ATTR(engine3_load
, S_IWUGO
, NULL
, store_engine3_load
);
734 static DEVICE_ATTR(selftest
, S_IRUGO
, lp5523_selftest
, NULL
);
736 static struct attribute
*lp5523_attributes
[] = {
737 &dev_attr_engine1_mode
.attr
,
738 &dev_attr_engine2_mode
.attr
,
739 &dev_attr_engine3_mode
.attr
,
740 &dev_attr_selftest
.attr
,
744 static struct attribute
*lp5523_engine1_attributes
[] = {
745 &dev_attr_engine1_load
.attr
,
746 &dev_attr_engine1_leds
.attr
,
750 static struct attribute
*lp5523_engine2_attributes
[] = {
751 &dev_attr_engine2_load
.attr
,
752 &dev_attr_engine2_leds
.attr
,
756 static struct attribute
*lp5523_engine3_attributes
[] = {
757 &dev_attr_engine3_load
.attr
,
758 &dev_attr_engine3_leds
.attr
,
762 static const struct attribute_group lp5523_group
= {
763 .attrs
= lp5523_attributes
,
766 static const struct attribute_group lp5523_engine_group
[] = {
767 {.attrs
= lp5523_engine1_attributes
},
768 {.attrs
= lp5523_engine2_attributes
},
769 {.attrs
= lp5523_engine3_attributes
},
772 static int lp5523_register_sysfs(struct i2c_client
*client
)
774 struct device
*dev
= &client
->dev
;
777 ret
= sysfs_create_group(&dev
->kobj
, &lp5523_group
);
784 static void lp5523_unregister_sysfs(struct i2c_client
*client
)
786 struct lp5523_chip
*chip
= i2c_get_clientdata(client
);
787 struct device
*dev
= &client
->dev
;
790 sysfs_remove_group(&dev
->kobj
, &lp5523_group
);
792 for (i
= 0; i
< ARRAY_SIZE(chip
->engines
); i
++)
793 if (chip
->engines
[i
].mode
== LP5523_CMD_LOAD
)
794 sysfs_remove_group(&dev
->kobj
, &lp5523_engine_group
[i
]);
796 for (i
= 0; i
< chip
->num_leds
; i
++)
797 sysfs_remove_group(&chip
->leds
[i
].cdev
.dev
->kobj
,
798 &lp5523_led_attribute_group
);
801 /*--------------------------------------------------------------*/
802 /* Set chip operating mode */
803 /*--------------------------------------------------------------*/
804 static int lp5523_set_mode(struct lp5523_engine
*engine
, u8 mode
)
807 struct lp5523_chip
*chip
= engine_to_lp5523(engine
);
808 struct i2c_client
*client
= chip
->client
;
809 struct device
*dev
= &client
->dev
;
812 /* if in that mode already do nothing, except for run */
813 if (mode
== engine
->mode
&& mode
!= LP5523_CMD_RUN
)
816 if (mode
== LP5523_CMD_RUN
) {
817 ret
= lp5523_run_program(engine
);
818 } else if (mode
== LP5523_CMD_LOAD
) {
819 lp5523_set_engine_mode(engine
, LP5523_CMD_DISABLED
);
820 lp5523_set_engine_mode(engine
, LP5523_CMD_LOAD
);
822 ret
= sysfs_create_group(&dev
->kobj
, engine
->attributes
);
825 } else if (mode
== LP5523_CMD_DISABLED
) {
826 lp5523_set_engine_mode(engine
, LP5523_CMD_DISABLED
);
829 /* remove load attribute from sysfs if not in load mode */
830 if (engine
->mode
== LP5523_CMD_LOAD
&& mode
!= LP5523_CMD_LOAD
)
831 sysfs_remove_group(&dev
->kobj
, engine
->attributes
);
838 /*--------------------------------------------------------------*/
839 /* Probe, Attach, Remove */
840 /*--------------------------------------------------------------*/
841 static int __init
lp5523_init_engine(struct lp5523_engine
*engine
, int id
)
843 if (id
< 1 || id
> LP5523_ENGINES
)
846 engine
->engine_mask
= LP5523_ENG_MASK_BASE
>> SHIFT_MASK(id
);
847 engine
->prog_page
= id
- 1;
848 engine
->mux_page
= id
+ 2;
849 engine
->attributes
= &lp5523_engine_group
[id
- 1];
854 static int __init
lp5523_init_led(struct lp5523_led
*led
, struct device
*dev
,
855 int chan
, struct lp5523_platform_data
*pdata
)
860 if (chan
>= LP5523_LEDS
)
863 if (pdata
->led_config
[chan
].led_current
) {
864 led
->led_current
= pdata
->led_config
[chan
].led_current
;
865 led
->max_current
= pdata
->led_config
[chan
].max_current
;
866 led
->chan_nr
= pdata
->led_config
[chan
].chan_nr
;
868 if (led
->chan_nr
>= LP5523_LEDS
) {
869 dev_err(dev
, "Use channel numbers between 0 and %d\n",
874 snprintf(name
, 32, "lp5523:channel%d", chan
);
876 led
->cdev
.name
= name
;
877 led
->cdev
.brightness_set
= lp5523_set_brightness
;
878 res
= led_classdev_register(dev
, &led
->cdev
);
880 dev_err(dev
, "couldn't register led on channel %d\n",
884 res
= sysfs_create_group(&led
->cdev
.dev
->kobj
,
885 &lp5523_led_attribute_group
);
887 dev_err(dev
, "couldn't register current attribute\n");
888 led_classdev_unregister(&led
->cdev
);
892 led
->led_current
= 0;
897 static struct i2c_driver lp5523_driver
;
899 static int lp5523_probe(struct i2c_client
*client
,
900 const struct i2c_device_id
*id
)
902 struct lp5523_chip
*chip
;
903 struct lp5523_platform_data
*pdata
;
906 chip
= kzalloc(sizeof(*chip
), GFP_KERNEL
);
910 i2c_set_clientdata(client
, chip
);
911 chip
->client
= client
;
913 pdata
= client
->dev
.platform_data
;
916 dev_err(&client
->dev
, "no platform data\n");
921 mutex_init(&chip
->lock
);
925 if (pdata
->setup_resources
) {
926 ret
= pdata
->setup_resources();
933 usleep_range(1000, 10000);
935 usleep_range(1000, 10000); /* Spec says min 500us */
938 ret
= lp5523_detect(client
);
942 dev_info(&client
->dev
, "LP5523 Programmable led chip found\n");
944 /* Initialize engines */
945 for (i
= 0; i
< ARRAY_SIZE(chip
->engines
); i
++) {
946 ret
= lp5523_init_engine(&chip
->engines
[i
], i
+ 1);
948 dev_err(&client
->dev
, "error initializing engine\n");
952 ret
= lp5523_configure(client
);
954 dev_err(&client
->dev
, "error configuring chip\n");
958 /* Initialize leds */
959 chip
->num_channels
= pdata
->num_channels
;
962 for (i
= 0; i
< pdata
->num_channels
; i
++) {
963 /* Do not initialize channels that are not connected */
964 if (pdata
->led_config
[i
].led_current
== 0)
967 ret
= lp5523_init_led(&chip
->leds
[led
], &client
->dev
, i
, pdata
);
969 dev_err(&client
->dev
, "error initializing leds\n");
974 chip
->leds
[led
].id
= led
;
975 /* Set LED current */
977 LP5523_REG_LED_CURRENT_BASE
+ chip
->leds
[led
].chan_nr
,
978 chip
->leds
[led
].led_current
);
980 INIT_WORK(&(chip
->leds
[led
].brightness_work
),
981 lp5523_led_brightness_work
);
986 ret
= lp5523_register_sysfs(client
);
988 dev_err(&client
->dev
, "registering sysfs failed\n");
993 for (i
= 0; i
< chip
->num_leds
; i
++) {
994 led_classdev_unregister(&chip
->leds
[i
].cdev
);
995 cancel_work_sync(&chip
->leds
[i
].brightness_work
);
1000 if (pdata
->release_resources
)
1001 pdata
->release_resources();
1007 static int lp5523_remove(struct i2c_client
*client
)
1009 struct lp5523_chip
*chip
= i2c_get_clientdata(client
);
1012 lp5523_unregister_sysfs(client
);
1014 for (i
= 0; i
< chip
->num_leds
; i
++) {
1015 led_classdev_unregister(&chip
->leds
[i
].cdev
);
1016 cancel_work_sync(&chip
->leds
[i
].brightness_work
);
1019 if (chip
->pdata
->enable
)
1020 chip
->pdata
->enable(0);
1021 if (chip
->pdata
->release_resources
)
1022 chip
->pdata
->release_resources();
1027 static const struct i2c_device_id lp5523_id
[] = {
1032 MODULE_DEVICE_TABLE(i2c
, lp5523_id
);
1034 static struct i2c_driver lp5523_driver
= {
1038 .probe
= lp5523_probe
,
1039 .remove
= lp5523_remove
,
1040 .id_table
= lp5523_id
,
1043 static int __init
lp5523_init(void)
1047 ret
= i2c_add_driver(&lp5523_driver
);
1050 printk(KERN_ALERT
"Adding lp5523 driver failed\n");
1055 static void __exit
lp5523_exit(void)
1057 i2c_del_driver(&lp5523_driver
);
1060 module_init(lp5523_init
);
1061 module_exit(lp5523_exit
);
1063 MODULE_AUTHOR("Mathias Nyman <mathias.nyman@nokia.com>");
1064 MODULE_DESCRIPTION("LP5523 LED engine");
1065 MODULE_LICENSE("GPL");