blob: 1392feb1bcf7849559ba29b38f163afa01a305bb [file] [log] [blame]
Samu Onkalo500fe142010-11-11 14:05:22 -08001/*
2 * LP5521 LED chip driver.
3 *
4 * Copyright (C) 2010 Nokia Corporation
Milo(Woogyom) Kima2387cb2013-02-05 19:28:00 +09005 * Copyright (C) 2012 Texas Instruments
Samu Onkalo500fe142010-11-11 14:05:22 -08006 *
7 * Contact: Samu Onkalo <samu.p.onkalo@nokia.com>
Milo(Woogyom) Kima2387cb2013-02-05 19:28:00 +09008 * Milo(Woogyom) Kim <milo.kim@ti.com>
Samu Onkalo500fe142010-11-11 14:05:22 -08009 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * version 2 as published by the Free Software Foundation.
13 *
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
22 * 02110-1301 USA
23 */
24
Samu Onkalo500fe142010-11-11 14:05:22 -080025#include <linux/delay.h>
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +090026#include <linux/firmware.h>
Milo(Woogyom) Kim79bcc102013-02-05 19:26:14 +090027#include <linux/i2c.h>
28#include <linux/init.h>
29#include <linux/leds.h>
30#include <linux/module.h>
31#include <linux/mutex.h>
32#include <linux/platform_data/leds-lp55xx.h>
33#include <linux/slab.h>
Linus Walleij7542a04b2013-04-23 04:52:59 -070034#include <linux/of.h>
Milo(Woogyom) Kim6a0c9a42013-02-05 18:03:08 +090035
36#include "leds-lp55xx-common.h"
Samu Onkalo500fe142010-11-11 14:05:22 -080037
Milo(Woogyom) Kim12f022d2013-02-05 19:25:26 +090038#define LP5521_PROGRAM_LENGTH 32
39#define LP5521_MAX_LEDS 3
40#define LP5521_CMD_DIRECT 0x3F
Samu Onkalo500fe142010-11-11 14:05:22 -080041
42/* Registers */
43#define LP5521_REG_ENABLE 0x00
44#define LP5521_REG_OP_MODE 0x01
45#define LP5521_REG_R_PWM 0x02
46#define LP5521_REG_G_PWM 0x03
47#define LP5521_REG_B_PWM 0x04
48#define LP5521_REG_R_CURRENT 0x05
49#define LP5521_REG_G_CURRENT 0x06
50#define LP5521_REG_B_CURRENT 0x07
51#define LP5521_REG_CONFIG 0x08
Samu Onkalo500fe142010-11-11 14:05:22 -080052#define LP5521_REG_STATUS 0x0C
53#define LP5521_REG_RESET 0x0D
Samu Onkalo500fe142010-11-11 14:05:22 -080054#define LP5521_REG_R_PROG_MEM 0x10
55#define LP5521_REG_G_PROG_MEM 0x30
56#define LP5521_REG_B_PROG_MEM 0x50
57
Samu Onkalo500fe142010-11-11 14:05:22 -080058/* Base register to set LED current */
59#define LP5521_REG_LED_CURRENT_BASE LP5521_REG_R_CURRENT
Samu Onkalo500fe142010-11-11 14:05:22 -080060/* Base register to set the brightness */
61#define LP5521_REG_LED_PWM_BASE LP5521_REG_R_PWM
62
63/* Bits in ENABLE register */
64#define LP5521_MASTER_ENABLE 0x40 /* Chip master enable */
65#define LP5521_LOGARITHMIC_PWM 0x80 /* Logarithmic PWM adjustment */
66#define LP5521_EXEC_RUN 0x2A
Kim, Milo32a2f742012-03-23 15:02:09 -070067#define LP5521_ENABLE_DEFAULT \
68 (LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM)
69#define LP5521_ENABLE_RUN_PROGRAM \
70 (LP5521_ENABLE_DEFAULT | LP5521_EXEC_RUN)
Samu Onkalo500fe142010-11-11 14:05:22 -080071
Kim, Milo81f2a5b42013-03-20 17:37:04 -070072/* CONFIG register */
73#define LP5521_PWM_HF 0x40 /* PWM: 0 = 256Hz, 1 = 558Hz */
74#define LP5521_PWRSAVE_EN 0x20 /* 1 = Power save mode */
75#define LP5521_CP_MODE_OFF 0 /* Charge pump (CP) off */
76#define LP5521_CP_MODE_BYPASS 8 /* CP forced to bypass mode */
77#define LP5521_CP_MODE_1X5 0x10 /* CP forced to 1.5x mode */
78#define LP5521_CP_MODE_AUTO 0x18 /* Automatic mode selection */
79#define LP5521_R_TO_BATT 0x04 /* R out: 0 = CP, 1 = Vbat */
80#define LP5521_CLK_INT 0x01 /* Internal clock */
81#define LP5521_DEFAULT_CFG \
82 (LP5521_PWM_HF | LP5521_PWRSAVE_EN | LP5521_CP_MODE_AUTO)
83
Samu Onkalo500fe142010-11-11 14:05:22 -080084/* Status */
85#define LP5521_EXT_CLK_USED 0x08
86
Srinidhi KASAGARb3c49c02011-10-31 17:12:24 -070087/* default R channel current register value */
88#define LP5521_REG_R_CURR_DEFAULT 0xAF
89
Milo(Woogyom) Kim48068d52013-02-05 18:08:49 +090090/* Reset register value */
91#define LP5521_RESET 0xFF
92
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +090093/* Program Memory Operations */
94#define LP5521_MODE_R_M 0x30 /* Operation Mode Register */
95#define LP5521_MODE_G_M 0x0C
96#define LP5521_MODE_B_M 0x03
97#define LP5521_LOAD_R 0x10
98#define LP5521_LOAD_G 0x04
99#define LP5521_LOAD_B 0x01
100
101#define LP5521_R_IS_LOADING(mode) \
102 ((mode & LP5521_MODE_R_M) == LP5521_LOAD_R)
103#define LP5521_G_IS_LOADING(mode) \
104 ((mode & LP5521_MODE_G_M) == LP5521_LOAD_G)
105#define LP5521_B_IS_LOADING(mode) \
106 ((mode & LP5521_MODE_B_M) == LP5521_LOAD_B)
107
108#define LP5521_EXEC_R_M 0x30 /* Enable Register */
109#define LP5521_EXEC_G_M 0x0C
110#define LP5521_EXEC_B_M 0x03
111#define LP5521_EXEC_M 0x3F
112#define LP5521_RUN_R 0x20
113#define LP5521_RUN_G 0x08
114#define LP5521_RUN_B 0x02
Samu Onkalo500fe142010-11-11 14:05:22 -0800115
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900116static inline void lp5521_wait_opmode_done(void)
117{
118 /* operation mode change needs to be longer than 153 us */
119 usleep_range(200, 300);
120}
121
Milo(Woogyom) Kim94482172013-02-05 18:03:55 +0900122static inline void lp5521_wait_enable_done(void)
123{
124 /* it takes more 488 us to update ENABLE register */
125 usleep_range(500, 600);
126}
127
Milo(Woogyom) Kima96bfa12013-02-05 19:09:32 +0900128static void lp5521_set_led_current(struct lp55xx_led *led, u8 led_current)
129{
130 led->led_current = led_current;
131 lp55xx_write(led->chip, LP5521_REG_LED_CURRENT_BASE + led->chan_nr,
132 led_current);
133}
134
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900135static void lp5521_load_engine(struct lp55xx_chip *chip)
Samu Onkalo500fe142010-11-11 14:05:22 -0800136{
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900137 enum lp55xx_engine_index idx = chip->engine_idx;
138 u8 mask[] = {
139 [LP55XX_ENGINE_1] = LP5521_MODE_R_M,
140 [LP55XX_ENGINE_2] = LP5521_MODE_G_M,
141 [LP55XX_ENGINE_3] = LP5521_MODE_B_M,
142 };
Samu Onkalo500fe142010-11-11 14:05:22 -0800143
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900144 u8 val[] = {
145 [LP55XX_ENGINE_1] = LP5521_LOAD_R,
146 [LP55XX_ENGINE_2] = LP5521_LOAD_G,
147 [LP55XX_ENGINE_3] = LP5521_LOAD_B,
148 };
Samu Onkalo500fe142010-11-11 14:05:22 -0800149
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900150 lp55xx_update_bits(chip, LP5521_REG_OP_MODE, mask[idx], val[idx]);
Samu Onkalo500fe142010-11-11 14:05:22 -0800151
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900152 lp5521_wait_opmode_done();
Samu Onkalo500fe142010-11-11 14:05:22 -0800153}
154
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900155static void lp5521_stop_engine(struct lp55xx_chip *chip)
Samu Onkalo500fe142010-11-11 14:05:22 -0800156{
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900157 lp55xx_write(chip, LP5521_REG_OP_MODE, 0);
158 lp5521_wait_opmode_done();
159}
160
161static void lp5521_run_engine(struct lp55xx_chip *chip, bool start)
162{
Samu Onkalo500fe142010-11-11 14:05:22 -0800163 int ret;
Samu Onkalo500fe142010-11-11 14:05:22 -0800164 u8 mode;
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900165 u8 exec;
Samu Onkalo500fe142010-11-11 14:05:22 -0800166
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900167 /* stop engine */
168 if (!start) {
169 lp5521_stop_engine(chip);
170 lp55xx_write(chip, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
171 lp5521_wait_opmode_done();
172 return;
173 }
174
175 /*
176 * To run the engine,
177 * operation mode and enable register should updated at the same time
178 */
179
180 ret = lp55xx_read(chip, LP5521_REG_OP_MODE, &mode);
Dan Carpenter5bc9ad72012-05-29 15:07:26 -0700181 if (ret)
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900182 return;
Dan Carpenter5bc9ad72012-05-29 15:07:26 -0700183
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900184 ret = lp55xx_read(chip, LP5521_REG_ENABLE, &exec);
Dan Carpenter5bc9ad72012-05-29 15:07:26 -0700185 if (ret)
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900186 return;
Samu Onkalo500fe142010-11-11 14:05:22 -0800187
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900188 /* change operation mode to RUN only when each engine is loading */
189 if (LP5521_R_IS_LOADING(mode)) {
190 mode = (mode & ~LP5521_MODE_R_M) | LP5521_RUN_R;
191 exec = (exec & ~LP5521_EXEC_R_M) | LP5521_RUN_R;
192 }
Samu Onkalo500fe142010-11-11 14:05:22 -0800193
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900194 if (LP5521_G_IS_LOADING(mode)) {
195 mode = (mode & ~LP5521_MODE_G_M) | LP5521_RUN_G;
196 exec = (exec & ~LP5521_EXEC_G_M) | LP5521_RUN_G;
197 }
Samu Onkalo500fe142010-11-11 14:05:22 -0800198
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900199 if (LP5521_B_IS_LOADING(mode)) {
200 mode = (mode & ~LP5521_MODE_B_M) | LP5521_RUN_B;
201 exec = (exec & ~LP5521_EXEC_B_M) | LP5521_RUN_B;
202 }
203
204 lp55xx_write(chip, LP5521_REG_OP_MODE, mode);
205 lp5521_wait_opmode_done();
206
207 lp55xx_update_bits(chip, LP5521_REG_ENABLE, LP5521_EXEC_M, exec);
208 lp5521_wait_enable_done();
209}
210
211static int lp5521_update_program_memory(struct lp55xx_chip *chip,
212 const u8 *data, size_t size)
213{
214 enum lp55xx_engine_index idx = chip->engine_idx;
215 u8 pattern[LP5521_PROGRAM_LENGTH] = {0};
216 u8 addr[] = {
217 [LP55XX_ENGINE_1] = LP5521_REG_R_PROG_MEM,
218 [LP55XX_ENGINE_2] = LP5521_REG_G_PROG_MEM,
219 [LP55XX_ENGINE_3] = LP5521_REG_B_PROG_MEM,
220 };
221 unsigned cmd;
222 char c[3];
223 int program_size;
224 int nrchars;
225 int offset = 0;
226 int ret;
227 int i;
228
229 /* clear program memory before updating */
230 for (i = 0; i < LP5521_PROGRAM_LENGTH; i++)
231 lp55xx_write(chip, addr[idx] + i, 0);
232
233 i = 0;
234 while ((offset < size - 1) && (i < LP5521_PROGRAM_LENGTH)) {
235 /* separate sscanfs because length is working only for %s */
236 ret = sscanf(data + offset, "%2s%n ", c, &nrchars);
237 if (ret != 1)
238 goto err;
239
240 ret = sscanf(c, "%2x", &cmd);
241 if (ret != 1)
242 goto err;
243
244 pattern[i] = (u8)cmd;
245 offset += nrchars;
246 i++;
247 }
248
249 /* Each instruction is 16bit long. Check that length is even */
250 if (i % 2)
251 goto err;
252
253 program_size = i;
254 for (i = 0; i < program_size; i++)
255 lp55xx_write(chip, addr[idx] + i, pattern[i]);
256
257 return 0;
258
259err:
260 dev_err(&chip->cl->dev, "wrong pattern format\n");
261 return -EINVAL;
262}
263
264static void lp5521_firmware_loaded(struct lp55xx_chip *chip)
265{
266 const struct firmware *fw = chip->fw;
267
268 if (fw->size > LP5521_PROGRAM_LENGTH) {
269 dev_err(&chip->cl->dev, "firmware data size overflow: %zu\n",
270 fw->size);
271 return;
272 }
273
274 /*
275 * Program momery sequence
276 * 1) set engine mode to "LOAD"
277 * 2) write firmware data into program memory
278 */
279
280 lp5521_load_engine(chip);
281 lp5521_update_program_memory(chip, fw->data, fw->size);
Samu Onkalo500fe142010-11-11 14:05:22 -0800282}
283
Milo(Woogyom) Kimffbdccd2013-02-05 18:57:36 +0900284static int lp5521_post_init_device(struct lp55xx_chip *chip)
Samu Onkalo500fe142010-11-11 14:05:22 -0800285{
Samu Onkalo500fe142010-11-11 14:05:22 -0800286 int ret;
Milo(Woogyom) Kim94482172013-02-05 18:03:55 +0900287 u8 val;
Samu Onkalo500fe142010-11-11 14:05:22 -0800288
Milo(Woogyom) Kim94482172013-02-05 18:03:55 +0900289 /*
290 * Make sure that the chip is reset by reading back the r channel
291 * current reg. This is dummy read is required on some platforms -
292 * otherwise further access to the R G B channels in the
293 * LP5521_REG_ENABLE register will not have any effect - strange!
294 */
Milo(Woogyom) Kimffbdccd2013-02-05 18:57:36 +0900295 ret = lp55xx_read(chip, LP5521_REG_R_CURRENT, &val);
Milo(Woogyom) Kim94482172013-02-05 18:03:55 +0900296 if (ret) {
Milo(Woogyom) Kimffbdccd2013-02-05 18:57:36 +0900297 dev_err(&chip->cl->dev, "error in resetting chip\n");
Milo(Woogyom) Kim94482172013-02-05 18:03:55 +0900298 return ret;
299 }
300 if (val != LP5521_REG_R_CURR_DEFAULT) {
Milo(Woogyom) Kimffbdccd2013-02-05 18:57:36 +0900301 dev_err(&chip->cl->dev,
Milo(Woogyom) Kim94482172013-02-05 18:03:55 +0900302 "unexpected data in register (expected 0x%x got 0x%x)\n",
303 LP5521_REG_R_CURR_DEFAULT, val);
304 ret = -EINVAL;
305 return ret;
306 }
307 usleep_range(10000, 20000);
Samu Onkalo500fe142010-11-11 14:05:22 -0800308
Samu Onkalo500fe142010-11-11 14:05:22 -0800309 /* Set all PWMs to direct control mode */
Milo(Woogyom) Kimffbdccd2013-02-05 18:57:36 +0900310 ret = lp55xx_write(chip, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
Samu Onkalo500fe142010-11-11 14:05:22 -0800311
Kim, Milo81f2a5b42013-03-20 17:37:04 -0700312 /* Update configuration for the clock setting */
313 val = LP5521_DEFAULT_CFG;
314 if (!lp55xx_is_extclk_used(chip))
315 val |= LP5521_CLK_INT;
316
Milo(Woogyom) Kimffbdccd2013-02-05 18:57:36 +0900317 ret = lp55xx_write(chip, LP5521_REG_CONFIG, val);
Milo(Woogyom) Kim94482172013-02-05 18:03:55 +0900318 if (ret)
319 return ret;
Samu Onkalo500fe142010-11-11 14:05:22 -0800320
321 /* Initialize all channels PWM to zero -> leds off */
Milo(Woogyom) Kimffbdccd2013-02-05 18:57:36 +0900322 lp55xx_write(chip, LP5521_REG_R_PWM, 0);
323 lp55xx_write(chip, LP5521_REG_G_PWM, 0);
324 lp55xx_write(chip, LP5521_REG_B_PWM, 0);
Samu Onkalo500fe142010-11-11 14:05:22 -0800325
326 /* Set engines are set to run state when OP_MODE enables engines */
Milo(Woogyom) Kimffbdccd2013-02-05 18:57:36 +0900327 ret = lp55xx_write(chip, LP5521_REG_ENABLE, LP5521_ENABLE_RUN_PROGRAM);
Milo(Woogyom) Kim94482172013-02-05 18:03:55 +0900328 if (ret)
329 return ret;
Samu Onkalo500fe142010-11-11 14:05:22 -0800330
Milo(Woogyom) Kim94482172013-02-05 18:03:55 +0900331 lp5521_wait_enable_done();
332
333 return 0;
Samu Onkalo500fe142010-11-11 14:05:22 -0800334}
335
Milo(Woogyom) Kim9ca3bd82013-02-05 19:21:43 +0900336static int lp5521_run_selftest(struct lp55xx_chip *chip, char *buf)
Samu Onkalo500fe142010-11-11 14:05:22 -0800337{
Milo(Woogyom) Kim9ca3bd82013-02-05 19:21:43 +0900338 struct lp55xx_platform_data *pdata = chip->pdata;
Samu Onkalo500fe142010-11-11 14:05:22 -0800339 int ret;
340 u8 status;
341
Milo(Woogyom) Kim9ca3bd82013-02-05 19:21:43 +0900342 ret = lp55xx_read(chip, LP5521_REG_STATUS, &status);
Samu Onkalo500fe142010-11-11 14:05:22 -0800343 if (ret < 0)
344 return ret;
345
Milo(Woogyom) Kim9ca3bd82013-02-05 19:21:43 +0900346 if (pdata->clock_mode != LP55XX_CLOCK_EXT)
347 return 0;
348
Samu Onkalo500fe142010-11-11 14:05:22 -0800349 /* Check that ext clock is really in use if requested */
Milo(Woogyom) Kim9ca3bd82013-02-05 19:21:43 +0900350 if ((status & LP5521_EXT_CLK_USED) == 0)
351 return -EIO;
352
Samu Onkalo500fe142010-11-11 14:05:22 -0800353 return 0;
354}
355
Samu Onkalo500fe142010-11-11 14:05:22 -0800356static void lp5521_led_brightness_work(struct work_struct *work)
357{
Milo(Woogyom) Kima6e46792013-02-05 19:08:40 +0900358 struct lp55xx_led *led = container_of(work, struct lp55xx_led,
Samu Onkalo500fe142010-11-11 14:05:22 -0800359 brightness_work);
Milo(Woogyom) Kima6e46792013-02-05 19:08:40 +0900360 struct lp55xx_chip *chip = led->chip;
Samu Onkalo500fe142010-11-11 14:05:22 -0800361
362 mutex_lock(&chip->lock);
Milo(Woogyom) Kima6e46792013-02-05 19:08:40 +0900363 lp55xx_write(chip, LP5521_REG_LED_PWM_BASE + led->chan_nr,
Samu Onkalo500fe142010-11-11 14:05:22 -0800364 led->brightness);
365 mutex_unlock(&chip->lock);
366}
367
Samu Onkalo500fe142010-11-11 14:05:22 -0800368static ssize_t lp5521_selftest(struct device *dev,
369 struct device_attribute *attr,
370 char *buf)
371{
Milo(Woogyom) Kim9ca3bd82013-02-05 19:21:43 +0900372 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
373 struct lp55xx_chip *chip = led->chip;
Samu Onkalo500fe142010-11-11 14:05:22 -0800374 int ret;
375
376 mutex_lock(&chip->lock);
377 ret = lp5521_run_selftest(chip, buf);
378 mutex_unlock(&chip->lock);
Kim, Milo24d32122013-03-14 17:19:36 -0700379
380 return scnprintf(buf, PAGE_SIZE, "%s\n", ret ? "FAIL" : "OK");
Samu Onkalo500fe142010-11-11 14:05:22 -0800381}
382
Samu Onkalo500fe142010-11-11 14:05:22 -0800383/* device attributes */
Samu Onkalo500fe142010-11-11 14:05:22 -0800384static DEVICE_ATTR(selftest, S_IRUGO, lp5521_selftest, NULL);
385
386static struct attribute *lp5521_attributes[] = {
Samu Onkalo500fe142010-11-11 14:05:22 -0800387 &dev_attr_selftest.attr,
Samu Onkalo500fe142010-11-11 14:05:22 -0800388 NULL
389};
390
391static const struct attribute_group lp5521_group = {
392 .attrs = lp5521_attributes,
393};
394
Milo(Woogyom) Kim48068d52013-02-05 18:08:49 +0900395/* Chip specific configurations */
396static struct lp55xx_device_config lp5521_cfg = {
397 .reset = {
398 .addr = LP5521_REG_RESET,
399 .val = LP5521_RESET,
400 },
Milo(Woogyom) Kime3a700d2013-02-05 18:09:56 +0900401 .enable = {
402 .addr = LP5521_REG_ENABLE,
403 .val = LP5521_ENABLE_DEFAULT,
404 },
Milo(Woogyom) Kim0e202342013-02-05 19:07:34 +0900405 .max_channel = LP5521_MAX_LEDS,
Milo(Woogyom) Kimffbdccd2013-02-05 18:57:36 +0900406 .post_init_device = lp5521_post_init_device,
Milo(Woogyom) Kima6e46792013-02-05 19:08:40 +0900407 .brightness_work_fn = lp5521_led_brightness_work,
Milo(Woogyom) Kima96bfa12013-02-05 19:09:32 +0900408 .set_led_current = lp5521_set_led_current,
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900409 .firmware_cb = lp5521_firmware_loaded,
410 .run_engine = lp5521_run_engine,
Milo(Woogyom) Kime73c0ce2013-02-05 19:20:45 +0900411 .dev_attr_group = &lp5521_group,
Milo(Woogyom) Kim48068d52013-02-05 18:08:49 +0900412};
413
Bill Pemberton98ea1ea2012-11-19 13:23:02 -0500414static int lp5521_probe(struct i2c_client *client,
Samu Onkalo500fe142010-11-11 14:05:22 -0800415 const struct i2c_device_id *id)
416{
Milo(Woogyom) Kim1904f832013-02-05 17:56:23 +0900417 int ret;
Milo(Woogyom) Kim6a0c9a42013-02-05 18:03:08 +0900418 struct lp55xx_chip *chip;
419 struct lp55xx_led *led;
Linus Walleij7542a04b2013-04-23 04:52:59 -0700420 struct lp55xx_platform_data *pdata;
421 struct device_node *np = client->dev.of_node;
Samu Onkalo500fe142010-11-11 14:05:22 -0800422
Linus Walleij7542a04b2013-04-23 04:52:59 -0700423 if (!client->dev.platform_data) {
424 if (np) {
425 ret = lp55xx_of_populate_pdata(&client->dev, np);
426 if (ret < 0)
427 return ret;
428 } else {
429 dev_err(&client->dev, "no platform data\n");
430 return -EINVAL;
431 }
Samu Onkalo500fe142010-11-11 14:05:22 -0800432 }
Linus Walleij7542a04b2013-04-23 04:52:59 -0700433 pdata = client->dev.platform_data;
Samu Onkalo500fe142010-11-11 14:05:22 -0800434
Milo(Woogyom) Kim6a0c9a42013-02-05 18:03:08 +0900435 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
436 if (!chip)
437 return -ENOMEM;
Samu Onkalo500fe142010-11-11 14:05:22 -0800438
Milo(Woogyom) Kim6a0c9a42013-02-05 18:03:08 +0900439 led = devm_kzalloc(&client->dev,
440 sizeof(*led) * pdata->num_channels, GFP_KERNEL);
441 if (!led)
442 return -ENOMEM;
443
444 chip->cl = client;
445 chip->pdata = pdata;
Milo(Woogyom) Kim48068d52013-02-05 18:08:49 +0900446 chip->cfg = &lp5521_cfg;
Milo(Woogyom) Kim6a0c9a42013-02-05 18:03:08 +0900447
448 mutex_init(&chip->lock);
449
450 i2c_set_clientdata(client, led);
Samu Onkalo500fe142010-11-11 14:05:22 -0800451
Milo(Woogyom) Kim22ebeb42013-02-05 18:58:35 +0900452 ret = lp55xx_init_device(chip);
Milo(Woogyom) Kim944f7b12013-02-05 17:49:46 +0900453 if (ret)
Milo(Woogyom) Kimf6c64c62013-02-05 17:58:01 +0900454 goto err_init;
Samu Onkalo500fe142010-11-11 14:05:22 -0800455
456 dev_info(&client->dev, "%s programmable led chip found\n", id->name);
457
Milo(Woogyom) Kim9e9b3db2013-02-05 19:06:27 +0900458 ret = lp55xx_register_leds(led, chip);
Milo(Woogyom) Kimf6524802013-02-05 17:53:40 +0900459 if (ret)
Milo(Woogyom) Kim9e9b3db2013-02-05 19:06:27 +0900460 goto err_register_leds;
Samu Onkalo500fe142010-11-11 14:05:22 -0800461
Milo(Woogyom) Kime73c0ce2013-02-05 19:20:45 +0900462 ret = lp55xx_register_sysfs(chip);
Samu Onkalo500fe142010-11-11 14:05:22 -0800463 if (ret) {
464 dev_err(&client->dev, "registering sysfs failed\n");
Milo(Woogyom) Kime73c0ce2013-02-05 19:20:45 +0900465 goto err_register_sysfs;
Samu Onkalo500fe142010-11-11 14:05:22 -0800466 }
Milo(Woogyom) Kime73c0ce2013-02-05 19:20:45 +0900467
468 return 0;
469
470err_register_sysfs:
Milo(Woogyom) Kimc3a68eb2013-02-05 19:11:18 +0900471 lp55xx_unregister_leds(led, chip);
Milo(Woogyom) Kim9e9b3db2013-02-05 19:06:27 +0900472err_register_leds:
Milo(Woogyom) Kim6ce61762013-02-05 19:03:02 +0900473 lp55xx_deinit_device(chip);
Milo(Woogyom) Kimf6c64c62013-02-05 17:58:01 +0900474err_init:
Samu Onkalo500fe142010-11-11 14:05:22 -0800475 return ret;
476}
477
Bill Pemberton678e8a62012-11-19 13:26:00 -0500478static int lp5521_remove(struct i2c_client *client)
Samu Onkalo500fe142010-11-11 14:05:22 -0800479{
Milo(Woogyom) Kim6ce61762013-02-05 19:03:02 +0900480 struct lp55xx_led *led = i2c_get_clientdata(client);
481 struct lp55xx_chip *chip = led->chip;
Samu Onkalo500fe142010-11-11 14:05:22 -0800482
Milo(Woogyom) Kim87cc4bd2013-02-05 19:23:51 +0900483 lp5521_stop_engine(chip);
484 lp55xx_unregister_sysfs(chip);
Milo(Woogyom) Kimc3a68eb2013-02-05 19:11:18 +0900485 lp55xx_unregister_leds(led, chip);
Milo(Woogyom) Kim6ce61762013-02-05 19:03:02 +0900486 lp55xx_deinit_device(chip);
Samu Onkalo500fe142010-11-11 14:05:22 -0800487
Samu Onkalo500fe142010-11-11 14:05:22 -0800488 return 0;
489}
490
491static const struct i2c_device_id lp5521_id[] = {
492 { "lp5521", 0 }, /* Three channel chip */
493 { }
494};
495MODULE_DEVICE_TABLE(i2c, lp5521_id);
496
Axel Linb548a342013-05-08 21:48:07 -0700497#ifdef CONFIG_OF
498static const struct of_device_id of_lp5521_leds_match[] = {
499 { .compatible = "national,lp5521", },
500 {},
501};
502
503MODULE_DEVICE_TABLE(of, of_lp5521_leds_match);
504#endif
Samu Onkalo500fe142010-11-11 14:05:22 -0800505static struct i2c_driver lp5521_driver = {
506 .driver = {
507 .name = "lp5521",
Axel Linb548a342013-05-08 21:48:07 -0700508 .of_match_table = of_match_ptr(of_lp5521_leds_match),
Samu Onkalo500fe142010-11-11 14:05:22 -0800509 },
510 .probe = lp5521_probe,
Bill Pembertondf07cf82012-11-19 13:20:20 -0500511 .remove = lp5521_remove,
Samu Onkalo500fe142010-11-11 14:05:22 -0800512 .id_table = lp5521_id,
513};
514
Axel Lin09a0d182012-01-10 15:09:27 -0800515module_i2c_driver(lp5521_driver);
Samu Onkalo500fe142010-11-11 14:05:22 -0800516
517MODULE_AUTHOR("Mathias Nyman, Yuri Zaporozhets, Samu Onkalo");
Milo(Woogyom) Kima2387cb2013-02-05 19:28:00 +0900518MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
Samu Onkalo500fe142010-11-11 14:05:22 -0800519MODULE_DESCRIPTION("LP5521 LED engine");
520MODULE_LICENSE("GPL v2");