blob: 1001347ba70bdf5eda5661458bd1eb7389441d44 [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>
Milo(Woogyom) Kim6a0c9a42013-02-05 18:03:08 +090034
35#include "leds-lp55xx-common.h"
Samu Onkalo500fe142010-11-11 14:05:22 -080036
Milo(Woogyom) Kim12f022d2013-02-05 19:25:26 +090037#define LP5521_PROGRAM_LENGTH 32
38#define LP5521_MAX_LEDS 3
39#define LP5521_CMD_DIRECT 0x3F
Samu Onkalo500fe142010-11-11 14:05:22 -080040
41/* Registers */
42#define LP5521_REG_ENABLE 0x00
43#define LP5521_REG_OP_MODE 0x01
44#define LP5521_REG_R_PWM 0x02
45#define LP5521_REG_G_PWM 0x03
46#define LP5521_REG_B_PWM 0x04
47#define LP5521_REG_R_CURRENT 0x05
48#define LP5521_REG_G_CURRENT 0x06
49#define LP5521_REG_B_CURRENT 0x07
50#define LP5521_REG_CONFIG 0x08
Samu Onkalo500fe142010-11-11 14:05:22 -080051#define LP5521_REG_STATUS 0x0C
52#define LP5521_REG_RESET 0x0D
Samu Onkalo500fe142010-11-11 14:05:22 -080053#define LP5521_REG_R_PROG_MEM 0x10
54#define LP5521_REG_G_PROG_MEM 0x30
55#define LP5521_REG_B_PROG_MEM 0x50
56
Samu Onkalo500fe142010-11-11 14:05:22 -080057/* Base register to set LED current */
58#define LP5521_REG_LED_CURRENT_BASE LP5521_REG_R_CURRENT
Samu Onkalo500fe142010-11-11 14:05:22 -080059/* Base register to set the brightness */
60#define LP5521_REG_LED_PWM_BASE LP5521_REG_R_PWM
61
62/* Bits in ENABLE register */
63#define LP5521_MASTER_ENABLE 0x40 /* Chip master enable */
64#define LP5521_LOGARITHMIC_PWM 0x80 /* Logarithmic PWM adjustment */
65#define LP5521_EXEC_RUN 0x2A
Kim, Milo32a2f742012-03-23 15:02:09 -070066#define LP5521_ENABLE_DEFAULT \
67 (LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM)
68#define LP5521_ENABLE_RUN_PROGRAM \
69 (LP5521_ENABLE_DEFAULT | LP5521_EXEC_RUN)
Samu Onkalo500fe142010-11-11 14:05:22 -080070
Samu Onkalo500fe142010-11-11 14:05:22 -080071/* Status */
72#define LP5521_EXT_CLK_USED 0x08
73
Srinidhi KASAGARb3c49c02011-10-31 17:12:24 -070074/* default R channel current register value */
75#define LP5521_REG_R_CURR_DEFAULT 0xAF
76
Milo(Woogyom) Kim48068d52013-02-05 18:08:49 +090077/* Reset register value */
78#define LP5521_RESET 0xFF
79
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +090080/* Program Memory Operations */
81#define LP5521_MODE_R_M 0x30 /* Operation Mode Register */
82#define LP5521_MODE_G_M 0x0C
83#define LP5521_MODE_B_M 0x03
84#define LP5521_LOAD_R 0x10
85#define LP5521_LOAD_G 0x04
86#define LP5521_LOAD_B 0x01
87
88#define LP5521_R_IS_LOADING(mode) \
89 ((mode & LP5521_MODE_R_M) == LP5521_LOAD_R)
90#define LP5521_G_IS_LOADING(mode) \
91 ((mode & LP5521_MODE_G_M) == LP5521_LOAD_G)
92#define LP5521_B_IS_LOADING(mode) \
93 ((mode & LP5521_MODE_B_M) == LP5521_LOAD_B)
94
95#define LP5521_EXEC_R_M 0x30 /* Enable Register */
96#define LP5521_EXEC_G_M 0x0C
97#define LP5521_EXEC_B_M 0x03
98#define LP5521_EXEC_M 0x3F
99#define LP5521_RUN_R 0x20
100#define LP5521_RUN_G 0x08
101#define LP5521_RUN_B 0x02
Samu Onkalo500fe142010-11-11 14:05:22 -0800102
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900103static inline void lp5521_wait_opmode_done(void)
104{
105 /* operation mode change needs to be longer than 153 us */
106 usleep_range(200, 300);
107}
108
Milo(Woogyom) Kim94482172013-02-05 18:03:55 +0900109static inline void lp5521_wait_enable_done(void)
110{
111 /* it takes more 488 us to update ENABLE register */
112 usleep_range(500, 600);
113}
114
Milo(Woogyom) Kima96bfa12013-02-05 19:09:32 +0900115static void lp5521_set_led_current(struct lp55xx_led *led, u8 led_current)
116{
117 led->led_current = led_current;
118 lp55xx_write(led->chip, LP5521_REG_LED_CURRENT_BASE + led->chan_nr,
119 led_current);
120}
121
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900122static void lp5521_load_engine(struct lp55xx_chip *chip)
Samu Onkalo500fe142010-11-11 14:05:22 -0800123{
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900124 enum lp55xx_engine_index idx = chip->engine_idx;
125 u8 mask[] = {
126 [LP55XX_ENGINE_1] = LP5521_MODE_R_M,
127 [LP55XX_ENGINE_2] = LP5521_MODE_G_M,
128 [LP55XX_ENGINE_3] = LP5521_MODE_B_M,
129 };
Samu Onkalo500fe142010-11-11 14:05:22 -0800130
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900131 u8 val[] = {
132 [LP55XX_ENGINE_1] = LP5521_LOAD_R,
133 [LP55XX_ENGINE_2] = LP5521_LOAD_G,
134 [LP55XX_ENGINE_3] = LP5521_LOAD_B,
135 };
Samu Onkalo500fe142010-11-11 14:05:22 -0800136
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900137 lp55xx_update_bits(chip, LP5521_REG_OP_MODE, mask[idx], val[idx]);
Samu Onkalo500fe142010-11-11 14:05:22 -0800138
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900139 lp5521_wait_opmode_done();
Samu Onkalo500fe142010-11-11 14:05:22 -0800140}
141
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900142static void lp5521_stop_engine(struct lp55xx_chip *chip)
Samu Onkalo500fe142010-11-11 14:05:22 -0800143{
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900144 lp55xx_write(chip, LP5521_REG_OP_MODE, 0);
145 lp5521_wait_opmode_done();
146}
147
148static void lp5521_run_engine(struct lp55xx_chip *chip, bool start)
149{
Samu Onkalo500fe142010-11-11 14:05:22 -0800150 int ret;
Samu Onkalo500fe142010-11-11 14:05:22 -0800151 u8 mode;
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900152 u8 exec;
Samu Onkalo500fe142010-11-11 14:05:22 -0800153
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900154 /* stop engine */
155 if (!start) {
156 lp5521_stop_engine(chip);
157 lp55xx_write(chip, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
158 lp5521_wait_opmode_done();
159 return;
160 }
161
162 /*
163 * To run the engine,
164 * operation mode and enable register should updated at the same time
165 */
166
167 ret = lp55xx_read(chip, LP5521_REG_OP_MODE, &mode);
Dan Carpenter5bc9ad72012-05-29 15:07:26 -0700168 if (ret)
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900169 return;
Dan Carpenter5bc9ad72012-05-29 15:07:26 -0700170
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900171 ret = lp55xx_read(chip, LP5521_REG_ENABLE, &exec);
Dan Carpenter5bc9ad72012-05-29 15:07:26 -0700172 if (ret)
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900173 return;
Samu Onkalo500fe142010-11-11 14:05:22 -0800174
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900175 /* change operation mode to RUN only when each engine is loading */
176 if (LP5521_R_IS_LOADING(mode)) {
177 mode = (mode & ~LP5521_MODE_R_M) | LP5521_RUN_R;
178 exec = (exec & ~LP5521_EXEC_R_M) | LP5521_RUN_R;
179 }
Samu Onkalo500fe142010-11-11 14:05:22 -0800180
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900181 if (LP5521_G_IS_LOADING(mode)) {
182 mode = (mode & ~LP5521_MODE_G_M) | LP5521_RUN_G;
183 exec = (exec & ~LP5521_EXEC_G_M) | LP5521_RUN_G;
184 }
Samu Onkalo500fe142010-11-11 14:05:22 -0800185
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900186 if (LP5521_B_IS_LOADING(mode)) {
187 mode = (mode & ~LP5521_MODE_B_M) | LP5521_RUN_B;
188 exec = (exec & ~LP5521_EXEC_B_M) | LP5521_RUN_B;
189 }
190
191 lp55xx_write(chip, LP5521_REG_OP_MODE, mode);
192 lp5521_wait_opmode_done();
193
194 lp55xx_update_bits(chip, LP5521_REG_ENABLE, LP5521_EXEC_M, exec);
195 lp5521_wait_enable_done();
196}
197
198static int lp5521_update_program_memory(struct lp55xx_chip *chip,
199 const u8 *data, size_t size)
200{
201 enum lp55xx_engine_index idx = chip->engine_idx;
202 u8 pattern[LP5521_PROGRAM_LENGTH] = {0};
203 u8 addr[] = {
204 [LP55XX_ENGINE_1] = LP5521_REG_R_PROG_MEM,
205 [LP55XX_ENGINE_2] = LP5521_REG_G_PROG_MEM,
206 [LP55XX_ENGINE_3] = LP5521_REG_B_PROG_MEM,
207 };
208 unsigned cmd;
209 char c[3];
210 int program_size;
211 int nrchars;
212 int offset = 0;
213 int ret;
214 int i;
215
216 /* clear program memory before updating */
217 for (i = 0; i < LP5521_PROGRAM_LENGTH; i++)
218 lp55xx_write(chip, addr[idx] + i, 0);
219
220 i = 0;
221 while ((offset < size - 1) && (i < LP5521_PROGRAM_LENGTH)) {
222 /* separate sscanfs because length is working only for %s */
223 ret = sscanf(data + offset, "%2s%n ", c, &nrchars);
224 if (ret != 1)
225 goto err;
226
227 ret = sscanf(c, "%2x", &cmd);
228 if (ret != 1)
229 goto err;
230
231 pattern[i] = (u8)cmd;
232 offset += nrchars;
233 i++;
234 }
235
236 /* Each instruction is 16bit long. Check that length is even */
237 if (i % 2)
238 goto err;
239
240 program_size = i;
241 for (i = 0; i < program_size; i++)
242 lp55xx_write(chip, addr[idx] + i, pattern[i]);
243
244 return 0;
245
246err:
247 dev_err(&chip->cl->dev, "wrong pattern format\n");
248 return -EINVAL;
249}
250
251static void lp5521_firmware_loaded(struct lp55xx_chip *chip)
252{
253 const struct firmware *fw = chip->fw;
254
255 if (fw->size > LP5521_PROGRAM_LENGTH) {
256 dev_err(&chip->cl->dev, "firmware data size overflow: %zu\n",
257 fw->size);
258 return;
259 }
260
261 /*
262 * Program momery sequence
263 * 1) set engine mode to "LOAD"
264 * 2) write firmware data into program memory
265 */
266
267 lp5521_load_engine(chip);
268 lp5521_update_program_memory(chip, fw->data, fw->size);
Samu Onkalo500fe142010-11-11 14:05:22 -0800269}
270
Milo(Woogyom) Kimffbdccd2013-02-05 18:57:36 +0900271static int lp5521_post_init_device(struct lp55xx_chip *chip)
Samu Onkalo500fe142010-11-11 14:05:22 -0800272{
Samu Onkalo500fe142010-11-11 14:05:22 -0800273 int ret;
Milo(Woogyom) Kim94482172013-02-05 18:03:55 +0900274 u8 val;
Samu Onkalo500fe142010-11-11 14:05:22 -0800275
Milo(Woogyom) Kim94482172013-02-05 18:03:55 +0900276 /*
277 * Make sure that the chip is reset by reading back the r channel
278 * current reg. This is dummy read is required on some platforms -
279 * otherwise further access to the R G B channels in the
280 * LP5521_REG_ENABLE register will not have any effect - strange!
281 */
Milo(Woogyom) Kimffbdccd2013-02-05 18:57:36 +0900282 ret = lp55xx_read(chip, LP5521_REG_R_CURRENT, &val);
Milo(Woogyom) Kim94482172013-02-05 18:03:55 +0900283 if (ret) {
Milo(Woogyom) Kimffbdccd2013-02-05 18:57:36 +0900284 dev_err(&chip->cl->dev, "error in resetting chip\n");
Milo(Woogyom) Kim94482172013-02-05 18:03:55 +0900285 return ret;
286 }
287 if (val != LP5521_REG_R_CURR_DEFAULT) {
Milo(Woogyom) Kimffbdccd2013-02-05 18:57:36 +0900288 dev_err(&chip->cl->dev,
Milo(Woogyom) Kim94482172013-02-05 18:03:55 +0900289 "unexpected data in register (expected 0x%x got 0x%x)\n",
290 LP5521_REG_R_CURR_DEFAULT, val);
291 ret = -EINVAL;
292 return ret;
293 }
294 usleep_range(10000, 20000);
Samu Onkalo500fe142010-11-11 14:05:22 -0800295
Samu Onkalo500fe142010-11-11 14:05:22 -0800296 /* Set all PWMs to direct control mode */
Milo(Woogyom) Kimffbdccd2013-02-05 18:57:36 +0900297 ret = lp55xx_write(chip, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
Samu Onkalo500fe142010-11-11 14:05:22 -0800298
Milo(Woogyom) Kimffbdccd2013-02-05 18:57:36 +0900299 val = chip->pdata->update_config ?
Kim, Milo3b49aac2012-03-23 15:02:08 -0700300 : (LP5521_PWRSAVE_EN | LP5521_CP_MODE_AUTO | LP5521_R_TO_BATT);
Milo(Woogyom) Kimffbdccd2013-02-05 18:57:36 +0900301 ret = lp55xx_write(chip, LP5521_REG_CONFIG, val);
Milo(Woogyom) Kim94482172013-02-05 18:03:55 +0900302 if (ret)
303 return ret;
Samu Onkalo500fe142010-11-11 14:05:22 -0800304
305 /* Initialize all channels PWM to zero -> leds off */
Milo(Woogyom) Kimffbdccd2013-02-05 18:57:36 +0900306 lp55xx_write(chip, LP5521_REG_R_PWM, 0);
307 lp55xx_write(chip, LP5521_REG_G_PWM, 0);
308 lp55xx_write(chip, LP5521_REG_B_PWM, 0);
Samu Onkalo500fe142010-11-11 14:05:22 -0800309
310 /* Set engines are set to run state when OP_MODE enables engines */
Milo(Woogyom) Kimffbdccd2013-02-05 18:57:36 +0900311 ret = lp55xx_write(chip, LP5521_REG_ENABLE, LP5521_ENABLE_RUN_PROGRAM);
Milo(Woogyom) Kim94482172013-02-05 18:03:55 +0900312 if (ret)
313 return ret;
Samu Onkalo500fe142010-11-11 14:05:22 -0800314
Milo(Woogyom) Kim94482172013-02-05 18:03:55 +0900315 lp5521_wait_enable_done();
316
317 return 0;
Samu Onkalo500fe142010-11-11 14:05:22 -0800318}
319
Milo(Woogyom) Kim9ca3bd82013-02-05 19:21:43 +0900320static int lp5521_run_selftest(struct lp55xx_chip *chip, char *buf)
Samu Onkalo500fe142010-11-11 14:05:22 -0800321{
Milo(Woogyom) Kim9ca3bd82013-02-05 19:21:43 +0900322 struct lp55xx_platform_data *pdata = chip->pdata;
Samu Onkalo500fe142010-11-11 14:05:22 -0800323 int ret;
324 u8 status;
325
Milo(Woogyom) Kim9ca3bd82013-02-05 19:21:43 +0900326 ret = lp55xx_read(chip, LP5521_REG_STATUS, &status);
Samu Onkalo500fe142010-11-11 14:05:22 -0800327 if (ret < 0)
328 return ret;
329
Milo(Woogyom) Kim9ca3bd82013-02-05 19:21:43 +0900330 if (pdata->clock_mode != LP55XX_CLOCK_EXT)
331 return 0;
332
Samu Onkalo500fe142010-11-11 14:05:22 -0800333 /* Check that ext clock is really in use if requested */
Milo(Woogyom) Kim9ca3bd82013-02-05 19:21:43 +0900334 if ((status & LP5521_EXT_CLK_USED) == 0)
335 return -EIO;
336
Samu Onkalo500fe142010-11-11 14:05:22 -0800337 return 0;
338}
339
Samu Onkalo500fe142010-11-11 14:05:22 -0800340static void lp5521_led_brightness_work(struct work_struct *work)
341{
Milo(Woogyom) Kima6e46792013-02-05 19:08:40 +0900342 struct lp55xx_led *led = container_of(work, struct lp55xx_led,
Samu Onkalo500fe142010-11-11 14:05:22 -0800343 brightness_work);
Milo(Woogyom) Kima6e46792013-02-05 19:08:40 +0900344 struct lp55xx_chip *chip = led->chip;
Samu Onkalo500fe142010-11-11 14:05:22 -0800345
346 mutex_lock(&chip->lock);
Milo(Woogyom) Kima6e46792013-02-05 19:08:40 +0900347 lp55xx_write(chip, LP5521_REG_LED_PWM_BASE + led->chan_nr,
Samu Onkalo500fe142010-11-11 14:05:22 -0800348 led->brightness);
349 mutex_unlock(&chip->lock);
350}
351
Samu Onkalo500fe142010-11-11 14:05:22 -0800352static ssize_t lp5521_selftest(struct device *dev,
353 struct device_attribute *attr,
354 char *buf)
355{
Milo(Woogyom) Kim9ca3bd82013-02-05 19:21:43 +0900356 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
357 struct lp55xx_chip *chip = led->chip;
Samu Onkalo500fe142010-11-11 14:05:22 -0800358 int ret;
359
360 mutex_lock(&chip->lock);
361 ret = lp5521_run_selftest(chip, buf);
362 mutex_unlock(&chip->lock);
363 return sprintf(buf, "%s\n", ret ? "FAIL" : "OK");
364}
365
Samu Onkalo500fe142010-11-11 14:05:22 -0800366/* device attributes */
Samu Onkalo500fe142010-11-11 14:05:22 -0800367static DEVICE_ATTR(selftest, S_IRUGO, lp5521_selftest, NULL);
368
369static struct attribute *lp5521_attributes[] = {
Samu Onkalo500fe142010-11-11 14:05:22 -0800370 &dev_attr_selftest.attr,
Samu Onkalo500fe142010-11-11 14:05:22 -0800371 NULL
372};
373
374static const struct attribute_group lp5521_group = {
375 .attrs = lp5521_attributes,
376};
377
Milo(Woogyom) Kim48068d52013-02-05 18:08:49 +0900378/* Chip specific configurations */
379static struct lp55xx_device_config lp5521_cfg = {
380 .reset = {
381 .addr = LP5521_REG_RESET,
382 .val = LP5521_RESET,
383 },
Milo(Woogyom) Kime3a700d2013-02-05 18:09:56 +0900384 .enable = {
385 .addr = LP5521_REG_ENABLE,
386 .val = LP5521_ENABLE_DEFAULT,
387 },
Milo(Woogyom) Kim0e202342013-02-05 19:07:34 +0900388 .max_channel = LP5521_MAX_LEDS,
Milo(Woogyom) Kimffbdccd2013-02-05 18:57:36 +0900389 .post_init_device = lp5521_post_init_device,
Milo(Woogyom) Kima6e46792013-02-05 19:08:40 +0900390 .brightness_work_fn = lp5521_led_brightness_work,
Milo(Woogyom) Kima96bfa12013-02-05 19:09:32 +0900391 .set_led_current = lp5521_set_led_current,
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900392 .firmware_cb = lp5521_firmware_loaded,
393 .run_engine = lp5521_run_engine,
Milo(Woogyom) Kime73c0ce2013-02-05 19:20:45 +0900394 .dev_attr_group = &lp5521_group,
Milo(Woogyom) Kim48068d52013-02-05 18:08:49 +0900395};
396
Bill Pemberton98ea1ea2012-11-19 13:23:02 -0500397static int lp5521_probe(struct i2c_client *client,
Samu Onkalo500fe142010-11-11 14:05:22 -0800398 const struct i2c_device_id *id)
399{
Milo(Woogyom) Kim1904f832013-02-05 17:56:23 +0900400 int ret;
Milo(Woogyom) Kim6a0c9a42013-02-05 18:03:08 +0900401 struct lp55xx_chip *chip;
402 struct lp55xx_led *led;
403 struct lp55xx_platform_data *pdata = client->dev.platform_data;
Samu Onkalo500fe142010-11-11 14:05:22 -0800404
Milo(Woogyom) Kim6a0c9a42013-02-05 18:03:08 +0900405 if (!pdata) {
Samu Onkalo500fe142010-11-11 14:05:22 -0800406 dev_err(&client->dev, "no platform data\n");
Bryan Wue430dc02012-07-04 11:16:09 +0800407 return -EINVAL;
Samu Onkalo500fe142010-11-11 14:05:22 -0800408 }
409
Milo(Woogyom) Kim6a0c9a42013-02-05 18:03:08 +0900410 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
411 if (!chip)
412 return -ENOMEM;
Samu Onkalo500fe142010-11-11 14:05:22 -0800413
Milo(Woogyom) Kim6a0c9a42013-02-05 18:03:08 +0900414 led = devm_kzalloc(&client->dev,
415 sizeof(*led) * pdata->num_channels, GFP_KERNEL);
416 if (!led)
417 return -ENOMEM;
418
419 chip->cl = client;
420 chip->pdata = pdata;
Milo(Woogyom) Kim48068d52013-02-05 18:08:49 +0900421 chip->cfg = &lp5521_cfg;
Milo(Woogyom) Kim6a0c9a42013-02-05 18:03:08 +0900422
423 mutex_init(&chip->lock);
424
425 i2c_set_clientdata(client, led);
Samu Onkalo500fe142010-11-11 14:05:22 -0800426
Milo(Woogyom) Kim22ebeb42013-02-05 18:58:35 +0900427 ret = lp55xx_init_device(chip);
Milo(Woogyom) Kim944f7b12013-02-05 17:49:46 +0900428 if (ret)
Milo(Woogyom) Kimf6c64c62013-02-05 17:58:01 +0900429 goto err_init;
Samu Onkalo500fe142010-11-11 14:05:22 -0800430
431 dev_info(&client->dev, "%s programmable led chip found\n", id->name);
432
Milo(Woogyom) Kim9e9b3db2013-02-05 19:06:27 +0900433 ret = lp55xx_register_leds(led, chip);
Milo(Woogyom) Kimf6524802013-02-05 17:53:40 +0900434 if (ret)
Milo(Woogyom) Kim9e9b3db2013-02-05 19:06:27 +0900435 goto err_register_leds;
Samu Onkalo500fe142010-11-11 14:05:22 -0800436
Milo(Woogyom) Kime73c0ce2013-02-05 19:20:45 +0900437 ret = lp55xx_register_sysfs(chip);
Samu Onkalo500fe142010-11-11 14:05:22 -0800438 if (ret) {
439 dev_err(&client->dev, "registering sysfs failed\n");
Milo(Woogyom) Kime73c0ce2013-02-05 19:20:45 +0900440 goto err_register_sysfs;
Samu Onkalo500fe142010-11-11 14:05:22 -0800441 }
Milo(Woogyom) Kime73c0ce2013-02-05 19:20:45 +0900442
443 return 0;
444
445err_register_sysfs:
Milo(Woogyom) Kimc3a68eb2013-02-05 19:11:18 +0900446 lp55xx_unregister_leds(led, chip);
Milo(Woogyom) Kim9e9b3db2013-02-05 19:06:27 +0900447err_register_leds:
Milo(Woogyom) Kim6ce61762013-02-05 19:03:02 +0900448 lp55xx_deinit_device(chip);
Milo(Woogyom) Kimf6c64c62013-02-05 17:58:01 +0900449err_init:
Samu Onkalo500fe142010-11-11 14:05:22 -0800450 return ret;
451}
452
Bill Pemberton678e8a62012-11-19 13:26:00 -0500453static int lp5521_remove(struct i2c_client *client)
Samu Onkalo500fe142010-11-11 14:05:22 -0800454{
Milo(Woogyom) Kim6ce61762013-02-05 19:03:02 +0900455 struct lp55xx_led *led = i2c_get_clientdata(client);
456 struct lp55xx_chip *chip = led->chip;
Samu Onkalo500fe142010-11-11 14:05:22 -0800457
Milo(Woogyom) Kim87cc4bd2013-02-05 19:23:51 +0900458 lp5521_stop_engine(chip);
459 lp55xx_unregister_sysfs(chip);
Milo(Woogyom) Kimc3a68eb2013-02-05 19:11:18 +0900460 lp55xx_unregister_leds(led, chip);
Milo(Woogyom) Kim6ce61762013-02-05 19:03:02 +0900461 lp55xx_deinit_device(chip);
Samu Onkalo500fe142010-11-11 14:05:22 -0800462
Samu Onkalo500fe142010-11-11 14:05:22 -0800463 return 0;
464}
465
466static const struct i2c_device_id lp5521_id[] = {
467 { "lp5521", 0 }, /* Three channel chip */
468 { }
469};
470MODULE_DEVICE_TABLE(i2c, lp5521_id);
471
472static struct i2c_driver lp5521_driver = {
473 .driver = {
474 .name = "lp5521",
475 },
476 .probe = lp5521_probe,
Bill Pembertondf07cf82012-11-19 13:20:20 -0500477 .remove = lp5521_remove,
Samu Onkalo500fe142010-11-11 14:05:22 -0800478 .id_table = lp5521_id,
479};
480
Axel Lin09a0d182012-01-10 15:09:27 -0800481module_i2c_driver(lp5521_driver);
Samu Onkalo500fe142010-11-11 14:05:22 -0800482
483MODULE_AUTHOR("Mathias Nyman, Yuri Zaporozhets, Samu Onkalo");
Milo(Woogyom) Kima2387cb2013-02-05 19:28:00 +0900484MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
Samu Onkalo500fe142010-11-11 14:05:22 -0800485MODULE_DESCRIPTION("LP5521 LED engine");
486MODULE_LICENSE("GPL v2");