blob: 19752c928aa2d6f99c2d15383fae905414f0bcdc [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
Kim, Milo81f2a5b42013-03-20 17:37:04 -070071/* CONFIG register */
72#define LP5521_PWM_HF 0x40 /* PWM: 0 = 256Hz, 1 = 558Hz */
73#define LP5521_PWRSAVE_EN 0x20 /* 1 = Power save mode */
74#define LP5521_CP_MODE_OFF 0 /* Charge pump (CP) off */
75#define LP5521_CP_MODE_BYPASS 8 /* CP forced to bypass mode */
76#define LP5521_CP_MODE_1X5 0x10 /* CP forced to 1.5x mode */
77#define LP5521_CP_MODE_AUTO 0x18 /* Automatic mode selection */
78#define LP5521_R_TO_BATT 0x04 /* R out: 0 = CP, 1 = Vbat */
79#define LP5521_CLK_INT 0x01 /* Internal clock */
80#define LP5521_DEFAULT_CFG \
81 (LP5521_PWM_HF | LP5521_PWRSAVE_EN | LP5521_CP_MODE_AUTO)
82
Samu Onkalo500fe142010-11-11 14:05:22 -080083/* Status */
84#define LP5521_EXT_CLK_USED 0x08
85
Srinidhi KASAGARb3c49c02011-10-31 17:12:24 -070086/* default R channel current register value */
87#define LP5521_REG_R_CURR_DEFAULT 0xAF
88
Milo(Woogyom) Kim48068d52013-02-05 18:08:49 +090089/* Reset register value */
90#define LP5521_RESET 0xFF
91
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +090092/* Program Memory Operations */
93#define LP5521_MODE_R_M 0x30 /* Operation Mode Register */
94#define LP5521_MODE_G_M 0x0C
95#define LP5521_MODE_B_M 0x03
96#define LP5521_LOAD_R 0x10
97#define LP5521_LOAD_G 0x04
98#define LP5521_LOAD_B 0x01
99
100#define LP5521_R_IS_LOADING(mode) \
101 ((mode & LP5521_MODE_R_M) == LP5521_LOAD_R)
102#define LP5521_G_IS_LOADING(mode) \
103 ((mode & LP5521_MODE_G_M) == LP5521_LOAD_G)
104#define LP5521_B_IS_LOADING(mode) \
105 ((mode & LP5521_MODE_B_M) == LP5521_LOAD_B)
106
107#define LP5521_EXEC_R_M 0x30 /* Enable Register */
108#define LP5521_EXEC_G_M 0x0C
109#define LP5521_EXEC_B_M 0x03
110#define LP5521_EXEC_M 0x3F
111#define LP5521_RUN_R 0x20
112#define LP5521_RUN_G 0x08
113#define LP5521_RUN_B 0x02
Samu Onkalo500fe142010-11-11 14:05:22 -0800114
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900115static inline void lp5521_wait_opmode_done(void)
116{
117 /* operation mode change needs to be longer than 153 us */
118 usleep_range(200, 300);
119}
120
Milo(Woogyom) Kim94482172013-02-05 18:03:55 +0900121static inline void lp5521_wait_enable_done(void)
122{
123 /* it takes more 488 us to update ENABLE register */
124 usleep_range(500, 600);
125}
126
Milo(Woogyom) Kima96bfa12013-02-05 19:09:32 +0900127static void lp5521_set_led_current(struct lp55xx_led *led, u8 led_current)
128{
129 led->led_current = led_current;
130 lp55xx_write(led->chip, LP5521_REG_LED_CURRENT_BASE + led->chan_nr,
131 led_current);
132}
133
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900134static void lp5521_load_engine(struct lp55xx_chip *chip)
Samu Onkalo500fe142010-11-11 14:05:22 -0800135{
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900136 enum lp55xx_engine_index idx = chip->engine_idx;
137 u8 mask[] = {
138 [LP55XX_ENGINE_1] = LP5521_MODE_R_M,
139 [LP55XX_ENGINE_2] = LP5521_MODE_G_M,
140 [LP55XX_ENGINE_3] = LP5521_MODE_B_M,
141 };
Samu Onkalo500fe142010-11-11 14:05:22 -0800142
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900143 u8 val[] = {
144 [LP55XX_ENGINE_1] = LP5521_LOAD_R,
145 [LP55XX_ENGINE_2] = LP5521_LOAD_G,
146 [LP55XX_ENGINE_3] = LP5521_LOAD_B,
147 };
Samu Onkalo500fe142010-11-11 14:05:22 -0800148
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900149 lp55xx_update_bits(chip, LP5521_REG_OP_MODE, mask[idx], val[idx]);
Samu Onkalo500fe142010-11-11 14:05:22 -0800150
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900151 lp5521_wait_opmode_done();
Samu Onkalo500fe142010-11-11 14:05:22 -0800152}
153
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900154static void lp5521_stop_engine(struct lp55xx_chip *chip)
Samu Onkalo500fe142010-11-11 14:05:22 -0800155{
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900156 lp55xx_write(chip, LP5521_REG_OP_MODE, 0);
157 lp5521_wait_opmode_done();
158}
159
160static void lp5521_run_engine(struct lp55xx_chip *chip, bool start)
161{
Samu Onkalo500fe142010-11-11 14:05:22 -0800162 int ret;
Samu Onkalo500fe142010-11-11 14:05:22 -0800163 u8 mode;
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900164 u8 exec;
Samu Onkalo500fe142010-11-11 14:05:22 -0800165
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900166 /* stop engine */
167 if (!start) {
168 lp5521_stop_engine(chip);
169 lp55xx_write(chip, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
170 lp5521_wait_opmode_done();
171 return;
172 }
173
174 /*
175 * To run the engine,
176 * operation mode and enable register should updated at the same time
177 */
178
179 ret = lp55xx_read(chip, LP5521_REG_OP_MODE, &mode);
Dan Carpenter5bc9ad72012-05-29 15:07:26 -0700180 if (ret)
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900181 return;
Dan Carpenter5bc9ad72012-05-29 15:07:26 -0700182
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900183 ret = lp55xx_read(chip, LP5521_REG_ENABLE, &exec);
Dan Carpenter5bc9ad72012-05-29 15:07:26 -0700184 if (ret)
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900185 return;
Samu Onkalo500fe142010-11-11 14:05:22 -0800186
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900187 /* change operation mode to RUN only when each engine is loading */
188 if (LP5521_R_IS_LOADING(mode)) {
189 mode = (mode & ~LP5521_MODE_R_M) | LP5521_RUN_R;
190 exec = (exec & ~LP5521_EXEC_R_M) | LP5521_RUN_R;
191 }
Samu Onkalo500fe142010-11-11 14:05:22 -0800192
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900193 if (LP5521_G_IS_LOADING(mode)) {
194 mode = (mode & ~LP5521_MODE_G_M) | LP5521_RUN_G;
195 exec = (exec & ~LP5521_EXEC_G_M) | LP5521_RUN_G;
196 }
Samu Onkalo500fe142010-11-11 14:05:22 -0800197
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900198 if (LP5521_B_IS_LOADING(mode)) {
199 mode = (mode & ~LP5521_MODE_B_M) | LP5521_RUN_B;
200 exec = (exec & ~LP5521_EXEC_B_M) | LP5521_RUN_B;
201 }
202
203 lp55xx_write(chip, LP5521_REG_OP_MODE, mode);
204 lp5521_wait_opmode_done();
205
206 lp55xx_update_bits(chip, LP5521_REG_ENABLE, LP5521_EXEC_M, exec);
207 lp5521_wait_enable_done();
208}
209
210static int lp5521_update_program_memory(struct lp55xx_chip *chip,
211 const u8 *data, size_t size)
212{
213 enum lp55xx_engine_index idx = chip->engine_idx;
214 u8 pattern[LP5521_PROGRAM_LENGTH] = {0};
215 u8 addr[] = {
216 [LP55XX_ENGINE_1] = LP5521_REG_R_PROG_MEM,
217 [LP55XX_ENGINE_2] = LP5521_REG_G_PROG_MEM,
218 [LP55XX_ENGINE_3] = LP5521_REG_B_PROG_MEM,
219 };
220 unsigned cmd;
221 char c[3];
222 int program_size;
223 int nrchars;
224 int offset = 0;
225 int ret;
226 int i;
227
228 /* clear program memory before updating */
229 for (i = 0; i < LP5521_PROGRAM_LENGTH; i++)
230 lp55xx_write(chip, addr[idx] + i, 0);
231
232 i = 0;
233 while ((offset < size - 1) && (i < LP5521_PROGRAM_LENGTH)) {
234 /* separate sscanfs because length is working only for %s */
235 ret = sscanf(data + offset, "%2s%n ", c, &nrchars);
236 if (ret != 1)
237 goto err;
238
239 ret = sscanf(c, "%2x", &cmd);
240 if (ret != 1)
241 goto err;
242
243 pattern[i] = (u8)cmd;
244 offset += nrchars;
245 i++;
246 }
247
248 /* Each instruction is 16bit long. Check that length is even */
249 if (i % 2)
250 goto err;
251
252 program_size = i;
253 for (i = 0; i < program_size; i++)
254 lp55xx_write(chip, addr[idx] + i, pattern[i]);
255
256 return 0;
257
258err:
259 dev_err(&chip->cl->dev, "wrong pattern format\n");
260 return -EINVAL;
261}
262
263static void lp5521_firmware_loaded(struct lp55xx_chip *chip)
264{
265 const struct firmware *fw = chip->fw;
266
267 if (fw->size > LP5521_PROGRAM_LENGTH) {
268 dev_err(&chip->cl->dev, "firmware data size overflow: %zu\n",
269 fw->size);
270 return;
271 }
272
273 /*
274 * Program momery sequence
275 * 1) set engine mode to "LOAD"
276 * 2) write firmware data into program memory
277 */
278
279 lp5521_load_engine(chip);
280 lp5521_update_program_memory(chip, fw->data, fw->size);
Samu Onkalo500fe142010-11-11 14:05:22 -0800281}
282
Milo(Woogyom) Kimffbdccd2013-02-05 18:57:36 +0900283static int lp5521_post_init_device(struct lp55xx_chip *chip)
Samu Onkalo500fe142010-11-11 14:05:22 -0800284{
Samu Onkalo500fe142010-11-11 14:05:22 -0800285 int ret;
Milo(Woogyom) Kim94482172013-02-05 18:03:55 +0900286 u8 val;
Samu Onkalo500fe142010-11-11 14:05:22 -0800287
Milo(Woogyom) Kim94482172013-02-05 18:03:55 +0900288 /*
289 * Make sure that the chip is reset by reading back the r channel
290 * current reg. This is dummy read is required on some platforms -
291 * otherwise further access to the R G B channels in the
292 * LP5521_REG_ENABLE register will not have any effect - strange!
293 */
Milo(Woogyom) Kimffbdccd2013-02-05 18:57:36 +0900294 ret = lp55xx_read(chip, LP5521_REG_R_CURRENT, &val);
Milo(Woogyom) Kim94482172013-02-05 18:03:55 +0900295 if (ret) {
Milo(Woogyom) Kimffbdccd2013-02-05 18:57:36 +0900296 dev_err(&chip->cl->dev, "error in resetting chip\n");
Milo(Woogyom) Kim94482172013-02-05 18:03:55 +0900297 return ret;
298 }
299 if (val != LP5521_REG_R_CURR_DEFAULT) {
Milo(Woogyom) Kimffbdccd2013-02-05 18:57:36 +0900300 dev_err(&chip->cl->dev,
Milo(Woogyom) Kim94482172013-02-05 18:03:55 +0900301 "unexpected data in register (expected 0x%x got 0x%x)\n",
302 LP5521_REG_R_CURR_DEFAULT, val);
303 ret = -EINVAL;
304 return ret;
305 }
306 usleep_range(10000, 20000);
Samu Onkalo500fe142010-11-11 14:05:22 -0800307
Samu Onkalo500fe142010-11-11 14:05:22 -0800308 /* Set all PWMs to direct control mode */
Milo(Woogyom) Kimffbdccd2013-02-05 18:57:36 +0900309 ret = lp55xx_write(chip, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
Samu Onkalo500fe142010-11-11 14:05:22 -0800310
Kim, Milo81f2a5b42013-03-20 17:37:04 -0700311 /* Update configuration for the clock setting */
312 val = LP5521_DEFAULT_CFG;
313 if (!lp55xx_is_extclk_used(chip))
314 val |= LP5521_CLK_INT;
315
Milo(Woogyom) Kimffbdccd2013-02-05 18:57:36 +0900316 ret = lp55xx_write(chip, LP5521_REG_CONFIG, val);
Milo(Woogyom) Kim94482172013-02-05 18:03:55 +0900317 if (ret)
318 return ret;
Samu Onkalo500fe142010-11-11 14:05:22 -0800319
320 /* Initialize all channels PWM to zero -> leds off */
Milo(Woogyom) Kimffbdccd2013-02-05 18:57:36 +0900321 lp55xx_write(chip, LP5521_REG_R_PWM, 0);
322 lp55xx_write(chip, LP5521_REG_G_PWM, 0);
323 lp55xx_write(chip, LP5521_REG_B_PWM, 0);
Samu Onkalo500fe142010-11-11 14:05:22 -0800324
325 /* Set engines are set to run state when OP_MODE enables engines */
Milo(Woogyom) Kimffbdccd2013-02-05 18:57:36 +0900326 ret = lp55xx_write(chip, LP5521_REG_ENABLE, LP5521_ENABLE_RUN_PROGRAM);
Milo(Woogyom) Kim94482172013-02-05 18:03:55 +0900327 if (ret)
328 return ret;
Samu Onkalo500fe142010-11-11 14:05:22 -0800329
Milo(Woogyom) Kim94482172013-02-05 18:03:55 +0900330 lp5521_wait_enable_done();
331
332 return 0;
Samu Onkalo500fe142010-11-11 14:05:22 -0800333}
334
Milo(Woogyom) Kim9ca3bd82013-02-05 19:21:43 +0900335static int lp5521_run_selftest(struct lp55xx_chip *chip, char *buf)
Samu Onkalo500fe142010-11-11 14:05:22 -0800336{
Milo(Woogyom) Kim9ca3bd82013-02-05 19:21:43 +0900337 struct lp55xx_platform_data *pdata = chip->pdata;
Samu Onkalo500fe142010-11-11 14:05:22 -0800338 int ret;
339 u8 status;
340
Milo(Woogyom) Kim9ca3bd82013-02-05 19:21:43 +0900341 ret = lp55xx_read(chip, LP5521_REG_STATUS, &status);
Samu Onkalo500fe142010-11-11 14:05:22 -0800342 if (ret < 0)
343 return ret;
344
Milo(Woogyom) Kim9ca3bd82013-02-05 19:21:43 +0900345 if (pdata->clock_mode != LP55XX_CLOCK_EXT)
346 return 0;
347
Samu Onkalo500fe142010-11-11 14:05:22 -0800348 /* Check that ext clock is really in use if requested */
Milo(Woogyom) Kim9ca3bd82013-02-05 19:21:43 +0900349 if ((status & LP5521_EXT_CLK_USED) == 0)
350 return -EIO;
351
Samu Onkalo500fe142010-11-11 14:05:22 -0800352 return 0;
353}
354
Samu Onkalo500fe142010-11-11 14:05:22 -0800355static void lp5521_led_brightness_work(struct work_struct *work)
356{
Milo(Woogyom) Kima6e46792013-02-05 19:08:40 +0900357 struct lp55xx_led *led = container_of(work, struct lp55xx_led,
Samu Onkalo500fe142010-11-11 14:05:22 -0800358 brightness_work);
Milo(Woogyom) Kima6e46792013-02-05 19:08:40 +0900359 struct lp55xx_chip *chip = led->chip;
Samu Onkalo500fe142010-11-11 14:05:22 -0800360
361 mutex_lock(&chip->lock);
Milo(Woogyom) Kima6e46792013-02-05 19:08:40 +0900362 lp55xx_write(chip, LP5521_REG_LED_PWM_BASE + led->chan_nr,
Samu Onkalo500fe142010-11-11 14:05:22 -0800363 led->brightness);
364 mutex_unlock(&chip->lock);
365}
366
Samu Onkalo500fe142010-11-11 14:05:22 -0800367static ssize_t lp5521_selftest(struct device *dev,
368 struct device_attribute *attr,
369 char *buf)
370{
Milo(Woogyom) Kim9ca3bd82013-02-05 19:21:43 +0900371 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
372 struct lp55xx_chip *chip = led->chip;
Samu Onkalo500fe142010-11-11 14:05:22 -0800373 int ret;
374
375 mutex_lock(&chip->lock);
376 ret = lp5521_run_selftest(chip, buf);
377 mutex_unlock(&chip->lock);
Kim, Milo24d32122013-03-14 17:19:36 -0700378
379 return scnprintf(buf, PAGE_SIZE, "%s\n", ret ? "FAIL" : "OK");
Samu Onkalo500fe142010-11-11 14:05:22 -0800380}
381
Samu Onkalo500fe142010-11-11 14:05:22 -0800382/* device attributes */
Samu Onkalo500fe142010-11-11 14:05:22 -0800383static DEVICE_ATTR(selftest, S_IRUGO, lp5521_selftest, NULL);
384
385static struct attribute *lp5521_attributes[] = {
Samu Onkalo500fe142010-11-11 14:05:22 -0800386 &dev_attr_selftest.attr,
Samu Onkalo500fe142010-11-11 14:05:22 -0800387 NULL
388};
389
390static const struct attribute_group lp5521_group = {
391 .attrs = lp5521_attributes,
392};
393
Milo(Woogyom) Kim48068d52013-02-05 18:08:49 +0900394/* Chip specific configurations */
395static struct lp55xx_device_config lp5521_cfg = {
396 .reset = {
397 .addr = LP5521_REG_RESET,
398 .val = LP5521_RESET,
399 },
Milo(Woogyom) Kime3a700d2013-02-05 18:09:56 +0900400 .enable = {
401 .addr = LP5521_REG_ENABLE,
402 .val = LP5521_ENABLE_DEFAULT,
403 },
Milo(Woogyom) Kim0e202342013-02-05 19:07:34 +0900404 .max_channel = LP5521_MAX_LEDS,
Milo(Woogyom) Kimffbdccd2013-02-05 18:57:36 +0900405 .post_init_device = lp5521_post_init_device,
Milo(Woogyom) Kima6e46792013-02-05 19:08:40 +0900406 .brightness_work_fn = lp5521_led_brightness_work,
Milo(Woogyom) Kima96bfa12013-02-05 19:09:32 +0900407 .set_led_current = lp5521_set_led_current,
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900408 .firmware_cb = lp5521_firmware_loaded,
409 .run_engine = lp5521_run_engine,
Milo(Woogyom) Kime73c0ce2013-02-05 19:20:45 +0900410 .dev_attr_group = &lp5521_group,
Milo(Woogyom) Kim48068d52013-02-05 18:08:49 +0900411};
412
Bill Pemberton98ea1ea2012-11-19 13:23:02 -0500413static int lp5521_probe(struct i2c_client *client,
Samu Onkalo500fe142010-11-11 14:05:22 -0800414 const struct i2c_device_id *id)
415{
Milo(Woogyom) Kim1904f832013-02-05 17:56:23 +0900416 int ret;
Milo(Woogyom) Kim6a0c9a42013-02-05 18:03:08 +0900417 struct lp55xx_chip *chip;
418 struct lp55xx_led *led;
419 struct lp55xx_platform_data *pdata = client->dev.platform_data;
Samu Onkalo500fe142010-11-11 14:05:22 -0800420
Milo(Woogyom) Kim6a0c9a42013-02-05 18:03:08 +0900421 if (!pdata) {
Samu Onkalo500fe142010-11-11 14:05:22 -0800422 dev_err(&client->dev, "no platform data\n");
Bryan Wue430dc02012-07-04 11:16:09 +0800423 return -EINVAL;
Samu Onkalo500fe142010-11-11 14:05:22 -0800424 }
425
Milo(Woogyom) Kim6a0c9a42013-02-05 18:03:08 +0900426 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
427 if (!chip)
428 return -ENOMEM;
Samu Onkalo500fe142010-11-11 14:05:22 -0800429
Milo(Woogyom) Kim6a0c9a42013-02-05 18:03:08 +0900430 led = devm_kzalloc(&client->dev,
431 sizeof(*led) * pdata->num_channels, GFP_KERNEL);
432 if (!led)
433 return -ENOMEM;
434
435 chip->cl = client;
436 chip->pdata = pdata;
Milo(Woogyom) Kim48068d52013-02-05 18:08:49 +0900437 chip->cfg = &lp5521_cfg;
Milo(Woogyom) Kim6a0c9a42013-02-05 18:03:08 +0900438
439 mutex_init(&chip->lock);
440
441 i2c_set_clientdata(client, led);
Samu Onkalo500fe142010-11-11 14:05:22 -0800442
Milo(Woogyom) Kim22ebeb42013-02-05 18:58:35 +0900443 ret = lp55xx_init_device(chip);
Milo(Woogyom) Kim944f7b12013-02-05 17:49:46 +0900444 if (ret)
Milo(Woogyom) Kimf6c64c62013-02-05 17:58:01 +0900445 goto err_init;
Samu Onkalo500fe142010-11-11 14:05:22 -0800446
447 dev_info(&client->dev, "%s programmable led chip found\n", id->name);
448
Milo(Woogyom) Kim9e9b3db2013-02-05 19:06:27 +0900449 ret = lp55xx_register_leds(led, chip);
Milo(Woogyom) Kimf6524802013-02-05 17:53:40 +0900450 if (ret)
Milo(Woogyom) Kim9e9b3db2013-02-05 19:06:27 +0900451 goto err_register_leds;
Samu Onkalo500fe142010-11-11 14:05:22 -0800452
Milo(Woogyom) Kime73c0ce2013-02-05 19:20:45 +0900453 ret = lp55xx_register_sysfs(chip);
Samu Onkalo500fe142010-11-11 14:05:22 -0800454 if (ret) {
455 dev_err(&client->dev, "registering sysfs failed\n");
Milo(Woogyom) Kime73c0ce2013-02-05 19:20:45 +0900456 goto err_register_sysfs;
Samu Onkalo500fe142010-11-11 14:05:22 -0800457 }
Milo(Woogyom) Kime73c0ce2013-02-05 19:20:45 +0900458
459 return 0;
460
461err_register_sysfs:
Milo(Woogyom) Kimc3a68eb2013-02-05 19:11:18 +0900462 lp55xx_unregister_leds(led, chip);
Milo(Woogyom) Kim9e9b3db2013-02-05 19:06:27 +0900463err_register_leds:
Milo(Woogyom) Kim6ce61762013-02-05 19:03:02 +0900464 lp55xx_deinit_device(chip);
Milo(Woogyom) Kimf6c64c62013-02-05 17:58:01 +0900465err_init:
Samu Onkalo500fe142010-11-11 14:05:22 -0800466 return ret;
467}
468
Bill Pemberton678e8a62012-11-19 13:26:00 -0500469static int lp5521_remove(struct i2c_client *client)
Samu Onkalo500fe142010-11-11 14:05:22 -0800470{
Milo(Woogyom) Kim6ce61762013-02-05 19:03:02 +0900471 struct lp55xx_led *led = i2c_get_clientdata(client);
472 struct lp55xx_chip *chip = led->chip;
Samu Onkalo500fe142010-11-11 14:05:22 -0800473
Milo(Woogyom) Kim87cc4bd2013-02-05 19:23:51 +0900474 lp5521_stop_engine(chip);
475 lp55xx_unregister_sysfs(chip);
Milo(Woogyom) Kimc3a68eb2013-02-05 19:11:18 +0900476 lp55xx_unregister_leds(led, chip);
Milo(Woogyom) Kim6ce61762013-02-05 19:03:02 +0900477 lp55xx_deinit_device(chip);
Samu Onkalo500fe142010-11-11 14:05:22 -0800478
Samu Onkalo500fe142010-11-11 14:05:22 -0800479 return 0;
480}
481
482static const struct i2c_device_id lp5521_id[] = {
483 { "lp5521", 0 }, /* Three channel chip */
484 { }
485};
486MODULE_DEVICE_TABLE(i2c, lp5521_id);
487
488static struct i2c_driver lp5521_driver = {
489 .driver = {
490 .name = "lp5521",
491 },
492 .probe = lp5521_probe,
Bill Pembertondf07cf82012-11-19 13:20:20 -0500493 .remove = lp5521_remove,
Samu Onkalo500fe142010-11-11 14:05:22 -0800494 .id_table = lp5521_id,
495};
496
Axel Lin09a0d182012-01-10 15:09:27 -0800497module_i2c_driver(lp5521_driver);
Samu Onkalo500fe142010-11-11 14:05:22 -0800498
499MODULE_AUTHOR("Mathias Nyman, Yuri Zaporozhets, Samu Onkalo");
Milo(Woogyom) Kima2387cb2013-02-05 19:28:00 +0900500MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
Samu Onkalo500fe142010-11-11 14:05:22 -0800501MODULE_DESCRIPTION("LP5521 LED engine");
502MODULE_LICENSE("GPL v2");