blob: 63a92542c8cb0953d17d5dcd8502075348dad9cf [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>
Milo(Woogyom) Kim79bcc102013-02-05 19:26:14 +090028#include <linux/leds.h>
29#include <linux/module.h>
30#include <linux/mutex.h>
31#include <linux/platform_data/leds-lp55xx.h>
32#include <linux/slab.h>
Linus Walleij7542a04b2013-04-23 04:52:59 -070033#include <linux/of.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 Kim28c92662013-11-20 22:13:34 -0800154static void lp5521_stop_all_engines(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
Milo Kim28c92662013-11-20 22:13:34 -0800160static void lp5521_stop_engine(struct lp55xx_chip *chip)
161{
162 enum lp55xx_engine_index idx = chip->engine_idx;
163 u8 mask[] = {
164 [LP55XX_ENGINE_1] = LP5521_MODE_R_M,
165 [LP55XX_ENGINE_2] = LP5521_MODE_G_M,
166 [LP55XX_ENGINE_3] = LP5521_MODE_B_M,
167 };
168
169 lp55xx_update_bits(chip, LP5521_REG_OP_MODE, mask[idx], 0);
170
171 lp5521_wait_opmode_done();
172}
173
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900174static void lp5521_run_engine(struct lp55xx_chip *chip, bool start)
175{
Samu Onkalo500fe142010-11-11 14:05:22 -0800176 int ret;
Samu Onkalo500fe142010-11-11 14:05:22 -0800177 u8 mode;
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900178 u8 exec;
Samu Onkalo500fe142010-11-11 14:05:22 -0800179
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900180 /* stop engine */
181 if (!start) {
182 lp5521_stop_engine(chip);
183 lp55xx_write(chip, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
184 lp5521_wait_opmode_done();
185 return;
186 }
187
188 /*
189 * To run the engine,
190 * operation mode and enable register should updated at the same time
191 */
192
193 ret = lp55xx_read(chip, LP5521_REG_OP_MODE, &mode);
Dan Carpenter5bc9ad72012-05-29 15:07:26 -0700194 if (ret)
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900195 return;
Dan Carpenter5bc9ad72012-05-29 15:07:26 -0700196
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900197 ret = lp55xx_read(chip, LP5521_REG_ENABLE, &exec);
Dan Carpenter5bc9ad72012-05-29 15:07:26 -0700198 if (ret)
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900199 return;
Samu Onkalo500fe142010-11-11 14:05:22 -0800200
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900201 /* change operation mode to RUN only when each engine is loading */
202 if (LP5521_R_IS_LOADING(mode)) {
203 mode = (mode & ~LP5521_MODE_R_M) | LP5521_RUN_R;
204 exec = (exec & ~LP5521_EXEC_R_M) | LP5521_RUN_R;
205 }
Samu Onkalo500fe142010-11-11 14:05:22 -0800206
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900207 if (LP5521_G_IS_LOADING(mode)) {
208 mode = (mode & ~LP5521_MODE_G_M) | LP5521_RUN_G;
209 exec = (exec & ~LP5521_EXEC_G_M) | LP5521_RUN_G;
210 }
Samu Onkalo500fe142010-11-11 14:05:22 -0800211
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900212 if (LP5521_B_IS_LOADING(mode)) {
213 mode = (mode & ~LP5521_MODE_B_M) | LP5521_RUN_B;
214 exec = (exec & ~LP5521_EXEC_B_M) | LP5521_RUN_B;
215 }
216
217 lp55xx_write(chip, LP5521_REG_OP_MODE, mode);
218 lp5521_wait_opmode_done();
219
220 lp55xx_update_bits(chip, LP5521_REG_ENABLE, LP5521_EXEC_M, exec);
221 lp5521_wait_enable_done();
222}
223
224static int lp5521_update_program_memory(struct lp55xx_chip *chip,
225 const u8 *data, size_t size)
226{
227 enum lp55xx_engine_index idx = chip->engine_idx;
228 u8 pattern[LP5521_PROGRAM_LENGTH] = {0};
229 u8 addr[] = {
230 [LP55XX_ENGINE_1] = LP5521_REG_R_PROG_MEM,
231 [LP55XX_ENGINE_2] = LP5521_REG_G_PROG_MEM,
232 [LP55XX_ENGINE_3] = LP5521_REG_B_PROG_MEM,
233 };
234 unsigned cmd;
235 char c[3];
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900236 int nrchars;
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900237 int ret;
Milo Kim1eca0b32013-08-08 13:45:45 +0900238 int offset = 0;
239 int i = 0;
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900240
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900241 while ((offset < size - 1) && (i < LP5521_PROGRAM_LENGTH)) {
242 /* separate sscanfs because length is working only for %s */
243 ret = sscanf(data + offset, "%2s%n ", c, &nrchars);
244 if (ret != 1)
245 goto err;
246
247 ret = sscanf(c, "%2x", &cmd);
248 if (ret != 1)
249 goto err;
250
251 pattern[i] = (u8)cmd;
252 offset += nrchars;
253 i++;
254 }
255
256 /* Each instruction is 16bit long. Check that length is even */
257 if (i % 2)
258 goto err;
259
Milo Kim1eca0b32013-08-08 13:45:45 +0900260 for (i = 0; i < LP5521_PROGRAM_LENGTH; i++) {
Milo Kimc0e5e9b2013-08-08 13:41:40 +0900261 ret = lp55xx_write(chip, addr[idx] + i, pattern[i]);
Milo Kime70988d2013-12-02 17:21:44 -0800262 if (ret)
Milo Kimc0e5e9b2013-08-08 13:41:40 +0900263 return -EINVAL;
Milo Kimc0e5e9b2013-08-08 13:41:40 +0900264 }
265
Milo Kimc0e5e9b2013-08-08 13:41:40 +0900266 return size;
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900267
268err:
269 dev_err(&chip->cl->dev, "wrong pattern format\n");
270 return -EINVAL;
271}
272
273static void lp5521_firmware_loaded(struct lp55xx_chip *chip)
274{
275 const struct firmware *fw = chip->fw;
276
277 if (fw->size > LP5521_PROGRAM_LENGTH) {
278 dev_err(&chip->cl->dev, "firmware data size overflow: %zu\n",
279 fw->size);
280 return;
281 }
282
283 /*
284 * Program momery sequence
285 * 1) set engine mode to "LOAD"
286 * 2) write firmware data into program memory
287 */
288
289 lp5521_load_engine(chip);
290 lp5521_update_program_memory(chip, fw->data, fw->size);
Samu Onkalo500fe142010-11-11 14:05:22 -0800291}
292
Milo(Woogyom) Kimffbdccd2013-02-05 18:57:36 +0900293static int lp5521_post_init_device(struct lp55xx_chip *chip)
Samu Onkalo500fe142010-11-11 14:05:22 -0800294{
Samu Onkalo500fe142010-11-11 14:05:22 -0800295 int ret;
Milo(Woogyom) Kim94482172013-02-05 18:03:55 +0900296 u8 val;
Samu Onkalo500fe142010-11-11 14:05:22 -0800297
Milo(Woogyom) Kim94482172013-02-05 18:03:55 +0900298 /*
299 * Make sure that the chip is reset by reading back the r channel
300 * current reg. This is dummy read is required on some platforms -
301 * otherwise further access to the R G B channels in the
302 * LP5521_REG_ENABLE register will not have any effect - strange!
303 */
Milo(Woogyom) Kimffbdccd2013-02-05 18:57:36 +0900304 ret = lp55xx_read(chip, LP5521_REG_R_CURRENT, &val);
Milo(Woogyom) Kim94482172013-02-05 18:03:55 +0900305 if (ret) {
Milo(Woogyom) Kimffbdccd2013-02-05 18:57:36 +0900306 dev_err(&chip->cl->dev, "error in resetting chip\n");
Milo(Woogyom) Kim94482172013-02-05 18:03:55 +0900307 return ret;
308 }
309 if (val != LP5521_REG_R_CURR_DEFAULT) {
Milo(Woogyom) Kimffbdccd2013-02-05 18:57:36 +0900310 dev_err(&chip->cl->dev,
Milo(Woogyom) Kim94482172013-02-05 18:03:55 +0900311 "unexpected data in register (expected 0x%x got 0x%x)\n",
312 LP5521_REG_R_CURR_DEFAULT, val);
313 ret = -EINVAL;
314 return ret;
315 }
316 usleep_range(10000, 20000);
Samu Onkalo500fe142010-11-11 14:05:22 -0800317
Samu Onkalo500fe142010-11-11 14:05:22 -0800318 /* Set all PWMs to direct control mode */
Milo(Woogyom) Kimffbdccd2013-02-05 18:57:36 +0900319 ret = lp55xx_write(chip, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
Samu Onkalo500fe142010-11-11 14:05:22 -0800320
Kim, Milo81f2a5b42013-03-20 17:37:04 -0700321 /* Update configuration for the clock setting */
322 val = LP5521_DEFAULT_CFG;
323 if (!lp55xx_is_extclk_used(chip))
324 val |= LP5521_CLK_INT;
325
Milo(Woogyom) Kimffbdccd2013-02-05 18:57:36 +0900326 ret = lp55xx_write(chip, LP5521_REG_CONFIG, val);
Milo(Woogyom) Kim94482172013-02-05 18:03:55 +0900327 if (ret)
328 return ret;
Samu Onkalo500fe142010-11-11 14:05:22 -0800329
330 /* Initialize all channels PWM to zero -> leds off */
Milo(Woogyom) Kimffbdccd2013-02-05 18:57:36 +0900331 lp55xx_write(chip, LP5521_REG_R_PWM, 0);
332 lp55xx_write(chip, LP5521_REG_G_PWM, 0);
333 lp55xx_write(chip, LP5521_REG_B_PWM, 0);
Samu Onkalo500fe142010-11-11 14:05:22 -0800334
335 /* Set engines are set to run state when OP_MODE enables engines */
Milo(Woogyom) Kimffbdccd2013-02-05 18:57:36 +0900336 ret = lp55xx_write(chip, LP5521_REG_ENABLE, LP5521_ENABLE_RUN_PROGRAM);
Milo(Woogyom) Kim94482172013-02-05 18:03:55 +0900337 if (ret)
338 return ret;
Samu Onkalo500fe142010-11-11 14:05:22 -0800339
Milo(Woogyom) Kim94482172013-02-05 18:03:55 +0900340 lp5521_wait_enable_done();
341
342 return 0;
Samu Onkalo500fe142010-11-11 14:05:22 -0800343}
344
Milo(Woogyom) Kim9ca3bd82013-02-05 19:21:43 +0900345static int lp5521_run_selftest(struct lp55xx_chip *chip, char *buf)
Samu Onkalo500fe142010-11-11 14:05:22 -0800346{
Milo(Woogyom) Kim9ca3bd82013-02-05 19:21:43 +0900347 struct lp55xx_platform_data *pdata = chip->pdata;
Samu Onkalo500fe142010-11-11 14:05:22 -0800348 int ret;
349 u8 status;
350
Milo(Woogyom) Kim9ca3bd82013-02-05 19:21:43 +0900351 ret = lp55xx_read(chip, LP5521_REG_STATUS, &status);
Samu Onkalo500fe142010-11-11 14:05:22 -0800352 if (ret < 0)
353 return ret;
354
Milo(Woogyom) Kim9ca3bd82013-02-05 19:21:43 +0900355 if (pdata->clock_mode != LP55XX_CLOCK_EXT)
356 return 0;
357
Samu Onkalo500fe142010-11-11 14:05:22 -0800358 /* Check that ext clock is really in use if requested */
Milo(Woogyom) Kim9ca3bd82013-02-05 19:21:43 +0900359 if ((status & LP5521_EXT_CLK_USED) == 0)
360 return -EIO;
361
Samu Onkalo500fe142010-11-11 14:05:22 -0800362 return 0;
363}
364
Samu Onkalo500fe142010-11-11 14:05:22 -0800365static void lp5521_led_brightness_work(struct work_struct *work)
366{
Milo(Woogyom) Kima6e46792013-02-05 19:08:40 +0900367 struct lp55xx_led *led = container_of(work, struct lp55xx_led,
Samu Onkalo500fe142010-11-11 14:05:22 -0800368 brightness_work);
Milo(Woogyom) Kima6e46792013-02-05 19:08:40 +0900369 struct lp55xx_chip *chip = led->chip;
Samu Onkalo500fe142010-11-11 14:05:22 -0800370
371 mutex_lock(&chip->lock);
Milo(Woogyom) Kima6e46792013-02-05 19:08:40 +0900372 lp55xx_write(chip, LP5521_REG_LED_PWM_BASE + led->chan_nr,
Samu Onkalo500fe142010-11-11 14:05:22 -0800373 led->brightness);
374 mutex_unlock(&chip->lock);
375}
376
Milo Kimc0e5e9b2013-08-08 13:41:40 +0900377static ssize_t show_engine_mode(struct device *dev,
378 struct device_attribute *attr,
379 char *buf, int nr)
380{
381 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
382 struct lp55xx_chip *chip = led->chip;
383 enum lp55xx_engine_mode mode = chip->engines[nr - 1].mode;
384
385 switch (mode) {
386 case LP55XX_ENGINE_RUN:
387 return sprintf(buf, "run\n");
388 case LP55XX_ENGINE_LOAD:
389 return sprintf(buf, "load\n");
390 case LP55XX_ENGINE_DISABLED:
391 default:
392 return sprintf(buf, "disabled\n");
393 }
394}
395show_mode(1)
396show_mode(2)
397show_mode(3)
398
399static ssize_t store_engine_mode(struct device *dev,
400 struct device_attribute *attr,
401 const char *buf, size_t len, int nr)
402{
403 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
404 struct lp55xx_chip *chip = led->chip;
405 struct lp55xx_engine *engine = &chip->engines[nr - 1];
406
407 mutex_lock(&chip->lock);
408
409 chip->engine_idx = nr;
410
411 if (!strncmp(buf, "run", 3)) {
412 lp5521_run_engine(chip, true);
413 engine->mode = LP55XX_ENGINE_RUN;
414 } else if (!strncmp(buf, "load", 4)) {
415 lp5521_stop_engine(chip);
416 lp5521_load_engine(chip);
417 engine->mode = LP55XX_ENGINE_LOAD;
418 } else if (!strncmp(buf, "disabled", 8)) {
419 lp5521_stop_engine(chip);
420 engine->mode = LP55XX_ENGINE_DISABLED;
421 }
422
423 mutex_unlock(&chip->lock);
424
425 return len;
426}
427store_mode(1)
428store_mode(2)
429store_mode(3)
430
431static ssize_t store_engine_load(struct device *dev,
432 struct device_attribute *attr,
433 const char *buf, size_t len, int nr)
434{
435 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
436 struct lp55xx_chip *chip = led->chip;
Milo Kime70988d2013-12-02 17:21:44 -0800437 int ret;
Milo Kimc0e5e9b2013-08-08 13:41:40 +0900438
439 mutex_lock(&chip->lock);
440
441 chip->engine_idx = nr;
442 lp5521_load_engine(chip);
Milo Kime70988d2013-12-02 17:21:44 -0800443 ret = lp5521_update_program_memory(chip, buf, len);
Milo Kimc0e5e9b2013-08-08 13:41:40 +0900444
445 mutex_unlock(&chip->lock);
446
Milo Kime70988d2013-12-02 17:21:44 -0800447 return ret;
Milo Kimc0e5e9b2013-08-08 13:41:40 +0900448}
449store_load(1)
450store_load(2)
451store_load(3)
452
Samu Onkalo500fe142010-11-11 14:05:22 -0800453static ssize_t lp5521_selftest(struct device *dev,
454 struct device_attribute *attr,
455 char *buf)
456{
Milo(Woogyom) Kim9ca3bd82013-02-05 19:21:43 +0900457 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
458 struct lp55xx_chip *chip = led->chip;
Samu Onkalo500fe142010-11-11 14:05:22 -0800459 int ret;
460
461 mutex_lock(&chip->lock);
462 ret = lp5521_run_selftest(chip, buf);
463 mutex_unlock(&chip->lock);
Kim, Milo24d32122013-03-14 17:19:36 -0700464
465 return scnprintf(buf, PAGE_SIZE, "%s\n", ret ? "FAIL" : "OK");
Samu Onkalo500fe142010-11-11 14:05:22 -0800466}
467
Samu Onkalo500fe142010-11-11 14:05:22 -0800468/* device attributes */
Milo Kimc0e5e9b2013-08-08 13:41:40 +0900469static LP55XX_DEV_ATTR_RW(engine1_mode, show_engine1_mode, store_engine1_mode);
470static LP55XX_DEV_ATTR_RW(engine2_mode, show_engine2_mode, store_engine2_mode);
471static LP55XX_DEV_ATTR_RW(engine3_mode, show_engine3_mode, store_engine3_mode);
472static LP55XX_DEV_ATTR_WO(engine1_load, store_engine1_load);
473static LP55XX_DEV_ATTR_WO(engine2_load, store_engine2_load);
474static LP55XX_DEV_ATTR_WO(engine3_load, store_engine3_load);
475static LP55XX_DEV_ATTR_RO(selftest, lp5521_selftest);
Samu Onkalo500fe142010-11-11 14:05:22 -0800476
477static struct attribute *lp5521_attributes[] = {
Milo Kimc0e5e9b2013-08-08 13:41:40 +0900478 &dev_attr_engine1_mode.attr,
479 &dev_attr_engine2_mode.attr,
480 &dev_attr_engine3_mode.attr,
481 &dev_attr_engine1_load.attr,
482 &dev_attr_engine2_load.attr,
483 &dev_attr_engine3_load.attr,
Samu Onkalo500fe142010-11-11 14:05:22 -0800484 &dev_attr_selftest.attr,
Samu Onkalo500fe142010-11-11 14:05:22 -0800485 NULL
486};
487
488static const struct attribute_group lp5521_group = {
489 .attrs = lp5521_attributes,
490};
491
Milo(Woogyom) Kim48068d52013-02-05 18:08:49 +0900492/* Chip specific configurations */
493static struct lp55xx_device_config lp5521_cfg = {
494 .reset = {
495 .addr = LP5521_REG_RESET,
496 .val = LP5521_RESET,
497 },
Milo(Woogyom) Kime3a700d2013-02-05 18:09:56 +0900498 .enable = {
499 .addr = LP5521_REG_ENABLE,
500 .val = LP5521_ENABLE_DEFAULT,
501 },
Milo(Woogyom) Kim0e202342013-02-05 19:07:34 +0900502 .max_channel = LP5521_MAX_LEDS,
Milo(Woogyom) Kimffbdccd2013-02-05 18:57:36 +0900503 .post_init_device = lp5521_post_init_device,
Milo(Woogyom) Kima6e46792013-02-05 19:08:40 +0900504 .brightness_work_fn = lp5521_led_brightness_work,
Milo(Woogyom) Kima96bfa12013-02-05 19:09:32 +0900505 .set_led_current = lp5521_set_led_current,
Milo(Woogyom) Kim9ce7cb12013-02-05 19:18:10 +0900506 .firmware_cb = lp5521_firmware_loaded,
507 .run_engine = lp5521_run_engine,
Milo(Woogyom) Kime73c0ce2013-02-05 19:20:45 +0900508 .dev_attr_group = &lp5521_group,
Milo(Woogyom) Kim48068d52013-02-05 18:08:49 +0900509};
510
Bill Pemberton98ea1ea2012-11-19 13:23:02 -0500511static int lp5521_probe(struct i2c_client *client,
Samu Onkalo500fe142010-11-11 14:05:22 -0800512 const struct i2c_device_id *id)
513{
Milo(Woogyom) Kim1904f832013-02-05 17:56:23 +0900514 int ret;
Milo(Woogyom) Kim6a0c9a42013-02-05 18:03:08 +0900515 struct lp55xx_chip *chip;
516 struct lp55xx_led *led;
Milo Kimed1333522015-08-24 16:09:55 +0900517 struct lp55xx_platform_data *pdata = dev_get_platdata(&client->dev);
Linus Walleij7542a04b2013-04-23 04:52:59 -0700518 struct device_node *np = client->dev.of_node;
Samu Onkalo500fe142010-11-11 14:05:22 -0800519
Milo Kimed1333522015-08-24 16:09:55 +0900520 if (!pdata) {
Linus Walleij7542a04b2013-04-23 04:52:59 -0700521 if (np) {
Milo Kimed1333522015-08-24 16:09:55 +0900522 pdata = lp55xx_of_populate_pdata(&client->dev, np);
523 if (IS_ERR(pdata))
524 return PTR_ERR(pdata);
Linus Walleij7542a04b2013-04-23 04:52:59 -0700525 } else {
526 dev_err(&client->dev, "no platform data\n");
527 return -EINVAL;
528 }
Samu Onkalo500fe142010-11-11 14:05:22 -0800529 }
530
Milo(Woogyom) Kim6a0c9a42013-02-05 18:03:08 +0900531 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
532 if (!chip)
533 return -ENOMEM;
Samu Onkalo500fe142010-11-11 14:05:22 -0800534
Milo(Woogyom) Kim6a0c9a42013-02-05 18:03:08 +0900535 led = devm_kzalloc(&client->dev,
536 sizeof(*led) * pdata->num_channels, GFP_KERNEL);
537 if (!led)
538 return -ENOMEM;
539
540 chip->cl = client;
541 chip->pdata = pdata;
Milo(Woogyom) Kim48068d52013-02-05 18:08:49 +0900542 chip->cfg = &lp5521_cfg;
Milo(Woogyom) Kim6a0c9a42013-02-05 18:03:08 +0900543
544 mutex_init(&chip->lock);
545
546 i2c_set_clientdata(client, led);
Samu Onkalo500fe142010-11-11 14:05:22 -0800547
Milo(Woogyom) Kim22ebeb42013-02-05 18:58:35 +0900548 ret = lp55xx_init_device(chip);
Milo(Woogyom) Kim944f7b12013-02-05 17:49:46 +0900549 if (ret)
Milo(Woogyom) Kimf6c64c62013-02-05 17:58:01 +0900550 goto err_init;
Samu Onkalo500fe142010-11-11 14:05:22 -0800551
552 dev_info(&client->dev, "%s programmable led chip found\n", id->name);
553
Milo(Woogyom) Kim9e9b3db2013-02-05 19:06:27 +0900554 ret = lp55xx_register_leds(led, chip);
Milo(Woogyom) Kimf6524802013-02-05 17:53:40 +0900555 if (ret)
Milo(Woogyom) Kim9e9b3db2013-02-05 19:06:27 +0900556 goto err_register_leds;
Samu Onkalo500fe142010-11-11 14:05:22 -0800557
Milo(Woogyom) Kime73c0ce2013-02-05 19:20:45 +0900558 ret = lp55xx_register_sysfs(chip);
Samu Onkalo500fe142010-11-11 14:05:22 -0800559 if (ret) {
560 dev_err(&client->dev, "registering sysfs failed\n");
Milo(Woogyom) Kime73c0ce2013-02-05 19:20:45 +0900561 goto err_register_sysfs;
Samu Onkalo500fe142010-11-11 14:05:22 -0800562 }
Milo(Woogyom) Kime73c0ce2013-02-05 19:20:45 +0900563
564 return 0;
565
566err_register_sysfs:
Milo(Woogyom) Kimc3a68eb2013-02-05 19:11:18 +0900567 lp55xx_unregister_leds(led, chip);
Milo(Woogyom) Kim9e9b3db2013-02-05 19:06:27 +0900568err_register_leds:
Milo(Woogyom) Kim6ce61762013-02-05 19:03:02 +0900569 lp55xx_deinit_device(chip);
Milo(Woogyom) Kimf6c64c62013-02-05 17:58:01 +0900570err_init:
Samu Onkalo500fe142010-11-11 14:05:22 -0800571 return ret;
572}
573
Bill Pemberton678e8a62012-11-19 13:26:00 -0500574static int lp5521_remove(struct i2c_client *client)
Samu Onkalo500fe142010-11-11 14:05:22 -0800575{
Milo(Woogyom) Kim6ce61762013-02-05 19:03:02 +0900576 struct lp55xx_led *led = i2c_get_clientdata(client);
577 struct lp55xx_chip *chip = led->chip;
Samu Onkalo500fe142010-11-11 14:05:22 -0800578
Milo Kim28c92662013-11-20 22:13:34 -0800579 lp5521_stop_all_engines(chip);
Milo(Woogyom) Kim87cc4bd2013-02-05 19:23:51 +0900580 lp55xx_unregister_sysfs(chip);
Milo(Woogyom) Kimc3a68eb2013-02-05 19:11:18 +0900581 lp55xx_unregister_leds(led, chip);
Milo(Woogyom) Kim6ce61762013-02-05 19:03:02 +0900582 lp55xx_deinit_device(chip);
Samu Onkalo500fe142010-11-11 14:05:22 -0800583
Samu Onkalo500fe142010-11-11 14:05:22 -0800584 return 0;
585}
586
587static const struct i2c_device_id lp5521_id[] = {
588 { "lp5521", 0 }, /* Three channel chip */
589 { }
590};
591MODULE_DEVICE_TABLE(i2c, lp5521_id);
592
Axel Linb548a342013-05-08 21:48:07 -0700593#ifdef CONFIG_OF
594static const struct of_device_id of_lp5521_leds_match[] = {
595 { .compatible = "national,lp5521", },
596 {},
597};
598
599MODULE_DEVICE_TABLE(of, of_lp5521_leds_match);
600#endif
Samu Onkalo500fe142010-11-11 14:05:22 -0800601static struct i2c_driver lp5521_driver = {
602 .driver = {
603 .name = "lp5521",
Axel Linb548a342013-05-08 21:48:07 -0700604 .of_match_table = of_match_ptr(of_lp5521_leds_match),
Samu Onkalo500fe142010-11-11 14:05:22 -0800605 },
606 .probe = lp5521_probe,
Bill Pembertondf07cf82012-11-19 13:20:20 -0500607 .remove = lp5521_remove,
Samu Onkalo500fe142010-11-11 14:05:22 -0800608 .id_table = lp5521_id,
609};
610
Axel Lin09a0d182012-01-10 15:09:27 -0800611module_i2c_driver(lp5521_driver);
Samu Onkalo500fe142010-11-11 14:05:22 -0800612
613MODULE_AUTHOR("Mathias Nyman, Yuri Zaporozhets, Samu Onkalo");
Milo(Woogyom) Kima2387cb2013-02-05 19:28:00 +0900614MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
Samu Onkalo500fe142010-11-11 14:05:22 -0800615MODULE_DESCRIPTION("LP5521 LED engine");
616MODULE_LICENSE("GPL v2");