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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * LP5521 LED chip driver.
4 *
5 * Copyright (C) 2010 Nokia Corporation
6 * Copyright (C) 2012 Texas Instruments
7 *
8 * Contact: Samu Onkalo <samu.p.onkalo@nokia.com>
9 * Milo(Woogyom) Kim <milo.kim@ti.com>
10 */
11
12#include <linux/cleanup.h>
13#include <linux/delay.h>
14#include <linux/firmware.h>
15#include <linux/i2c.h>
16#include <linux/leds.h>
17#include <linux/module.h>
18#include <linux/mutex.h>
19#include <linux/platform_data/leds-lp55xx.h>
20#include <linux/slab.h>
21#include <linux/of.h>
22
23#include "leds-lp55xx-common.h"
24
25#define LP5521_MAX_LEDS 3
26#define LP5521_CMD_DIRECT 0x3F
27
28/* Registers */
29#define LP5521_REG_ENABLE 0x00
30#define LP5521_REG_OP_MODE 0x01
31#define LP5521_REG_R_PWM 0x02
32#define LP5521_REG_G_PWM 0x03
33#define LP5521_REG_B_PWM 0x04
34#define LP5521_REG_R_CURRENT 0x05
35#define LP5521_REG_G_CURRENT 0x06
36#define LP5521_REG_B_CURRENT 0x07
37#define LP5521_REG_CONFIG 0x08
38#define LP5521_REG_STATUS 0x0C
39#define LP5521_REG_RESET 0x0D
40#define LP5521_REG_R_PROG_MEM 0x10
41#define LP5521_REG_G_PROG_MEM 0x30
42#define LP5521_REG_B_PROG_MEM 0x50
43
44/* Base register to set LED current */
45#define LP5521_REG_LED_CURRENT_BASE LP5521_REG_R_CURRENT
46/* Base register to set the brightness */
47#define LP5521_REG_LED_PWM_BASE LP5521_REG_R_PWM
48
49/* Bits in ENABLE register */
50#define LP5521_MASTER_ENABLE 0x40 /* Chip master enable */
51#define LP5521_LOGARITHMIC_PWM 0x80 /* Logarithmic PWM adjustment */
52#define LP5521_EXEC_RUN 0x2A
53#define LP5521_ENABLE_DEFAULT \
54 (LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM)
55#define LP5521_ENABLE_RUN_PROGRAM \
56 (LP5521_ENABLE_DEFAULT | LP5521_EXEC_RUN)
57
58/* CONFIG register */
59#define LP5521_PWM_HF 0x40 /* PWM: 0 = 256Hz, 1 = 558Hz */
60#define LP5521_PWRSAVE_EN 0x20 /* 1 = Power save mode */
61#define LP5521_CP_MODE_MASK 0x18 /* Charge pump mode */
62#define LP5521_CP_MODE_SHIFT 3
63#define LP5521_R_TO_BATT 0x04 /* R out: 0 = CP, 1 = Vbat */
64#define LP5521_CLK_INT 0x01 /* Internal clock */
65#define LP5521_DEFAULT_CFG (LP5521_PWM_HF | LP5521_PWRSAVE_EN)
66
67/* Status */
68#define LP5521_EXT_CLK_USED 0x08
69
70/* default R channel current register value */
71#define LP5521_REG_R_CURR_DEFAULT 0xAF
72
73/* Reset register value */
74#define LP5521_RESET 0xFF
75
76static inline void lp5521_wait_opmode_done(void)
77{
78 /* operation mode change needs to be longer than 153 us */
79 usleep_range(200, 300);
80}
81
82static inline void lp5521_wait_enable_done(void)
83{
84 /* it takes more 488 us to update ENABLE register */
85 usleep_range(500, 600);
86}
87
88static void lp5521_run_engine(struct lp55xx_chip *chip, bool start)
89{
90 int ret;
91
92 /* stop engine */
93 if (!start) {
94 lp55xx_stop_engine(chip);
95 lp55xx_write(chip, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
96 lp5521_wait_opmode_done();
97 return;
98 }
99
100 ret = lp55xx_run_engine_common(chip);
101 if (!ret)
102 lp5521_wait_enable_done();
103}
104
105static int lp5521_post_init_device(struct lp55xx_chip *chip)
106{
107 int ret;
108 u8 val;
109
110 /*
111 * Make sure that the chip is reset by reading back the r channel
112 * current reg. This is dummy read is required on some platforms -
113 * otherwise further access to the R G B channels in the
114 * LP5521_REG_ENABLE register will not have any effect - strange!
115 */
116 ret = lp55xx_read(chip, LP5521_REG_R_CURRENT, &val);
117 if (ret) {
118 dev_err(&chip->cl->dev, "error in resetting chip\n");
119 return ret;
120 }
121 if (val != LP5521_REG_R_CURR_DEFAULT) {
122 dev_err(&chip->cl->dev,
123 "unexpected data in register (expected 0x%x got 0x%x)\n",
124 LP5521_REG_R_CURR_DEFAULT, val);
125 ret = -EINVAL;
126 return ret;
127 }
128 usleep_range(10000, 20000);
129
130 /* Set all PWMs to direct control mode */
131 ret = lp55xx_write(chip, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
132 if (ret)
133 return ret;
134
135 /* Update configuration for the clock setting */
136 val = LP5521_DEFAULT_CFG;
137 if (!lp55xx_is_extclk_used(chip))
138 val |= LP5521_CLK_INT;
139
140 val |= (chip->pdata->charge_pump_mode << LP5521_CP_MODE_SHIFT) & LP5521_CP_MODE_MASK;
141
142 ret = lp55xx_write(chip, LP5521_REG_CONFIG, val);
143 if (ret)
144 return ret;
145
146 /* Initialize all channels PWM to zero -> leds off */
147 lp55xx_write(chip, LP5521_REG_R_PWM, 0);
148 lp55xx_write(chip, LP5521_REG_G_PWM, 0);
149 lp55xx_write(chip, LP5521_REG_B_PWM, 0);
150
151 /* Set engines are set to run state when OP_MODE enables engines */
152 ret = lp55xx_write(chip, LP5521_REG_ENABLE, LP5521_ENABLE_RUN_PROGRAM);
153 if (ret)
154 return ret;
155
156 lp5521_wait_enable_done();
157
158 return 0;
159}
160
161static int lp5521_run_selftest(struct lp55xx_chip *chip, char *buf)
162{
163 struct lp55xx_platform_data *pdata = chip->pdata;
164 int ret;
165 u8 status;
166
167 ret = lp55xx_read(chip, LP5521_REG_STATUS, &status);
168 if (ret < 0)
169 return ret;
170
171 if (pdata->clock_mode != LP55XX_CLOCK_EXT)
172 return 0;
173
174 /* Check that ext clock is really in use if requested */
175 if ((status & LP5521_EXT_CLK_USED) == 0)
176 return -EIO;
177
178 return 0;
179}
180
181static ssize_t lp5521_selftest(struct device *dev,
182 struct device_attribute *attr,
183 char *buf)
184{
185 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
186 struct lp55xx_chip *chip = led->chip;
187 int ret;
188
189 guard(mutex)(&chip->lock);
190
191 ret = lp5521_run_selftest(chip, buf);
192
193 return sysfs_emit(buf, "%s\n", ret ? "FAIL" : "OK");
194}
195
196/* device attributes */
197LP55XX_DEV_ATTR_ENGINE_MODE(1);
198LP55XX_DEV_ATTR_ENGINE_MODE(2);
199LP55XX_DEV_ATTR_ENGINE_MODE(3);
200LP55XX_DEV_ATTR_ENGINE_LOAD(1);
201LP55XX_DEV_ATTR_ENGINE_LOAD(2);
202LP55XX_DEV_ATTR_ENGINE_LOAD(3);
203static LP55XX_DEV_ATTR_RO(selftest, lp5521_selftest);
204
205static struct attribute *lp5521_attributes[] = {
206 &dev_attr_engine1_mode.attr,
207 &dev_attr_engine2_mode.attr,
208 &dev_attr_engine3_mode.attr,
209 &dev_attr_engine1_load.attr,
210 &dev_attr_engine2_load.attr,
211 &dev_attr_engine3_load.attr,
212 &dev_attr_selftest.attr,
213 NULL
214};
215
216static const struct attribute_group lp5521_group = {
217 .attrs = lp5521_attributes,
218};
219
220/* Chip specific configurations */
221static struct lp55xx_device_config lp5521_cfg = {
222 .reg_op_mode = {
223 .addr = LP5521_REG_OP_MODE,
224 },
225 .reg_exec = {
226 .addr = LP5521_REG_ENABLE,
227 },
228 .reset = {
229 .addr = LP5521_REG_RESET,
230 .val = LP5521_RESET,
231 },
232 .enable = {
233 .addr = LP5521_REG_ENABLE,
234 .val = LP5521_ENABLE_DEFAULT,
235 },
236 .prog_mem_base = {
237 .addr = LP5521_REG_R_PROG_MEM,
238 },
239 .reg_led_pwm_base = {
240 .addr = LP5521_REG_LED_PWM_BASE,
241 },
242 .reg_led_current_base = {
243 .addr = LP5521_REG_LED_CURRENT_BASE,
244 },
245 .max_channel = LP5521_MAX_LEDS,
246 .post_init_device = lp5521_post_init_device,
247 .brightness_fn = lp55xx_led_brightness,
248 .multicolor_brightness_fn = lp55xx_multicolor_brightness,
249 .set_led_current = lp55xx_set_led_current,
250 .firmware_cb = lp55xx_firmware_loaded_cb,
251 .run_engine = lp5521_run_engine,
252 .dev_attr_group = &lp5521_group,
253};
254
255static const struct i2c_device_id lp5521_id[] = {
256 { "lp5521", .driver_data = (kernel_ulong_t)&lp5521_cfg, }, /* Three channel chip */
257 { }
258};
259MODULE_DEVICE_TABLE(i2c, lp5521_id);
260
261static const struct of_device_id of_lp5521_leds_match[] = {
262 { .compatible = "national,lp5521", .data = &lp5521_cfg, },
263 {},
264};
265
266MODULE_DEVICE_TABLE(of, of_lp5521_leds_match);
267
268static struct i2c_driver lp5521_driver = {
269 .driver = {
270 .name = "lp5521",
271 .of_match_table = of_lp5521_leds_match,
272 },
273 .probe = lp55xx_probe,
274 .remove = lp55xx_remove,
275 .id_table = lp5521_id,
276};
277
278module_i2c_driver(lp5521_driver);
279
280MODULE_AUTHOR("Mathias Nyman, Yuri Zaporozhets, Samu Onkalo");
281MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
282MODULE_DESCRIPTION("LP5521 LED engine");
283MODULE_LICENSE("GPL v2");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * LP5521 LED chip driver.
4 *
5 * Copyright (C) 2010 Nokia Corporation
6 * Copyright (C) 2012 Texas Instruments
7 *
8 * Contact: Samu Onkalo <samu.p.onkalo@nokia.com>
9 * Milo(Woogyom) Kim <milo.kim@ti.com>
10 */
11
12#include <linux/delay.h>
13#include <linux/firmware.h>
14#include <linux/i2c.h>
15#include <linux/leds.h>
16#include <linux/module.h>
17#include <linux/mutex.h>
18#include <linux/platform_data/leds-lp55xx.h>
19#include <linux/slab.h>
20#include <linux/of.h>
21
22#include "leds-lp55xx-common.h"
23
24#define LP5521_PROGRAM_LENGTH 32
25#define LP5521_MAX_LEDS 3
26#define LP5521_CMD_DIRECT 0x3F
27
28/* Registers */
29#define LP5521_REG_ENABLE 0x00
30#define LP5521_REG_OP_MODE 0x01
31#define LP5521_REG_R_PWM 0x02
32#define LP5521_REG_G_PWM 0x03
33#define LP5521_REG_B_PWM 0x04
34#define LP5521_REG_R_CURRENT 0x05
35#define LP5521_REG_G_CURRENT 0x06
36#define LP5521_REG_B_CURRENT 0x07
37#define LP5521_REG_CONFIG 0x08
38#define LP5521_REG_STATUS 0x0C
39#define LP5521_REG_RESET 0x0D
40#define LP5521_REG_R_PROG_MEM 0x10
41#define LP5521_REG_G_PROG_MEM 0x30
42#define LP5521_REG_B_PROG_MEM 0x50
43
44/* Base register to set LED current */
45#define LP5521_REG_LED_CURRENT_BASE LP5521_REG_R_CURRENT
46/* Base register to set the brightness */
47#define LP5521_REG_LED_PWM_BASE LP5521_REG_R_PWM
48
49/* Bits in ENABLE register */
50#define LP5521_MASTER_ENABLE 0x40 /* Chip master enable */
51#define LP5521_LOGARITHMIC_PWM 0x80 /* Logarithmic PWM adjustment */
52#define LP5521_EXEC_RUN 0x2A
53#define LP5521_ENABLE_DEFAULT \
54 (LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM)
55#define LP5521_ENABLE_RUN_PROGRAM \
56 (LP5521_ENABLE_DEFAULT | LP5521_EXEC_RUN)
57
58/* CONFIG register */
59#define LP5521_PWM_HF 0x40 /* PWM: 0 = 256Hz, 1 = 558Hz */
60#define LP5521_PWRSAVE_EN 0x20 /* 1 = Power save mode */
61#define LP5521_CP_MODE_OFF 0 /* Charge pump (CP) off */
62#define LP5521_CP_MODE_BYPASS 8 /* CP forced to bypass mode */
63#define LP5521_CP_MODE_1X5 0x10 /* CP forced to 1.5x mode */
64#define LP5521_CP_MODE_AUTO 0x18 /* Automatic mode selection */
65#define LP5521_R_TO_BATT 0x04 /* R out: 0 = CP, 1 = Vbat */
66#define LP5521_CLK_INT 0x01 /* Internal clock */
67#define LP5521_DEFAULT_CFG \
68 (LP5521_PWM_HF | LP5521_PWRSAVE_EN | LP5521_CP_MODE_AUTO)
69
70/* Status */
71#define LP5521_EXT_CLK_USED 0x08
72
73/* default R channel current register value */
74#define LP5521_REG_R_CURR_DEFAULT 0xAF
75
76/* Reset register value */
77#define LP5521_RESET 0xFF
78
79/* Program Memory Operations */
80#define LP5521_MODE_R_M 0x30 /* Operation Mode Register */
81#define LP5521_MODE_G_M 0x0C
82#define LP5521_MODE_B_M 0x03
83#define LP5521_LOAD_R 0x10
84#define LP5521_LOAD_G 0x04
85#define LP5521_LOAD_B 0x01
86
87#define LP5521_R_IS_LOADING(mode) \
88 ((mode & LP5521_MODE_R_M) == LP5521_LOAD_R)
89#define LP5521_G_IS_LOADING(mode) \
90 ((mode & LP5521_MODE_G_M) == LP5521_LOAD_G)
91#define LP5521_B_IS_LOADING(mode) \
92 ((mode & LP5521_MODE_B_M) == LP5521_LOAD_B)
93
94#define LP5521_EXEC_R_M 0x30 /* Enable Register */
95#define LP5521_EXEC_G_M 0x0C
96#define LP5521_EXEC_B_M 0x03
97#define LP5521_EXEC_M 0x3F
98#define LP5521_RUN_R 0x20
99#define LP5521_RUN_G 0x08
100#define LP5521_RUN_B 0x02
101
102static inline void lp5521_wait_opmode_done(void)
103{
104 /* operation mode change needs to be longer than 153 us */
105 usleep_range(200, 300);
106}
107
108static inline void lp5521_wait_enable_done(void)
109{
110 /* it takes more 488 us to update ENABLE register */
111 usleep_range(500, 600);
112}
113
114static void lp5521_set_led_current(struct lp55xx_led *led, u8 led_current)
115{
116 led->led_current = led_current;
117 lp55xx_write(led->chip, LP5521_REG_LED_CURRENT_BASE + led->chan_nr,
118 led_current);
119}
120
121static void lp5521_load_engine(struct lp55xx_chip *chip)
122{
123 enum lp55xx_engine_index idx = chip->engine_idx;
124 static const u8 mask[] = {
125 [LP55XX_ENGINE_1] = LP5521_MODE_R_M,
126 [LP55XX_ENGINE_2] = LP5521_MODE_G_M,
127 [LP55XX_ENGINE_3] = LP5521_MODE_B_M,
128 };
129
130 static const u8 val[] = {
131 [LP55XX_ENGINE_1] = LP5521_LOAD_R,
132 [LP55XX_ENGINE_2] = LP5521_LOAD_G,
133 [LP55XX_ENGINE_3] = LP5521_LOAD_B,
134 };
135
136 lp55xx_update_bits(chip, LP5521_REG_OP_MODE, mask[idx], val[idx]);
137
138 lp5521_wait_opmode_done();
139}
140
141static void lp5521_stop_all_engines(struct lp55xx_chip *chip)
142{
143 lp55xx_write(chip, LP5521_REG_OP_MODE, 0);
144 lp5521_wait_opmode_done();
145}
146
147static void lp5521_stop_engine(struct lp55xx_chip *chip)
148{
149 enum lp55xx_engine_index idx = chip->engine_idx;
150 static const u8 mask[] = {
151 [LP55XX_ENGINE_1] = LP5521_MODE_R_M,
152 [LP55XX_ENGINE_2] = LP5521_MODE_G_M,
153 [LP55XX_ENGINE_3] = LP5521_MODE_B_M,
154 };
155
156 lp55xx_update_bits(chip, LP5521_REG_OP_MODE, mask[idx], 0);
157
158 lp5521_wait_opmode_done();
159}
160
161static void lp5521_run_engine(struct lp55xx_chip *chip, bool start)
162{
163 int ret;
164 u8 mode;
165 u8 exec;
166
167 /* 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);
181 if (ret)
182 return;
183
184 ret = lp55xx_read(chip, LP5521_REG_ENABLE, &exec);
185 if (ret)
186 return;
187
188 /* 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 }
193
194 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 }
198
199 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 static const 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 nrchars;
224 int ret;
225 int offset = 0;
226 int i = 0;
227
228 while ((offset < size - 1) && (i < LP5521_PROGRAM_LENGTH)) {
229 /* separate sscanfs because length is working only for %s */
230 ret = sscanf(data + offset, "%2s%n ", c, &nrchars);
231 if (ret != 1)
232 goto err;
233
234 ret = sscanf(c, "%2x", &cmd);
235 if (ret != 1)
236 goto err;
237
238 pattern[i] = (u8)cmd;
239 offset += nrchars;
240 i++;
241 }
242
243 /* Each instruction is 16bit long. Check that length is even */
244 if (i % 2)
245 goto err;
246
247 for (i = 0; i < LP5521_PROGRAM_LENGTH; i++) {
248 ret = lp55xx_write(chip, addr[idx] + i, pattern[i]);
249 if (ret)
250 return -EINVAL;
251 }
252
253 return size;
254
255err:
256 dev_err(&chip->cl->dev, "wrong pattern format\n");
257 return -EINVAL;
258}
259
260static void lp5521_firmware_loaded(struct lp55xx_chip *chip)
261{
262 const struct firmware *fw = chip->fw;
263
264 if (fw->size > LP5521_PROGRAM_LENGTH) {
265 dev_err(&chip->cl->dev, "firmware data size overflow: %zu\n",
266 fw->size);
267 return;
268 }
269
270 /*
271 * Program memory sequence
272 * 1) set engine mode to "LOAD"
273 * 2) write firmware data into program memory
274 */
275
276 lp5521_load_engine(chip);
277 lp5521_update_program_memory(chip, fw->data, fw->size);
278}
279
280static int lp5521_post_init_device(struct lp55xx_chip *chip)
281{
282 int ret;
283 u8 val;
284
285 /*
286 * Make sure that the chip is reset by reading back the r channel
287 * current reg. This is dummy read is required on some platforms -
288 * otherwise further access to the R G B channels in the
289 * LP5521_REG_ENABLE register will not have any effect - strange!
290 */
291 ret = lp55xx_read(chip, LP5521_REG_R_CURRENT, &val);
292 if (ret) {
293 dev_err(&chip->cl->dev, "error in resetting chip\n");
294 return ret;
295 }
296 if (val != LP5521_REG_R_CURR_DEFAULT) {
297 dev_err(&chip->cl->dev,
298 "unexpected data in register (expected 0x%x got 0x%x)\n",
299 LP5521_REG_R_CURR_DEFAULT, val);
300 ret = -EINVAL;
301 return ret;
302 }
303 usleep_range(10000, 20000);
304
305 /* Set all PWMs to direct control mode */
306 ret = lp55xx_write(chip, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
307
308 /* Update configuration for the clock setting */
309 val = LP5521_DEFAULT_CFG;
310 if (!lp55xx_is_extclk_used(chip))
311 val |= LP5521_CLK_INT;
312
313 ret = lp55xx_write(chip, LP5521_REG_CONFIG, val);
314 if (ret)
315 return ret;
316
317 /* Initialize all channels PWM to zero -> leds off */
318 lp55xx_write(chip, LP5521_REG_R_PWM, 0);
319 lp55xx_write(chip, LP5521_REG_G_PWM, 0);
320 lp55xx_write(chip, LP5521_REG_B_PWM, 0);
321
322 /* Set engines are set to run state when OP_MODE enables engines */
323 ret = lp55xx_write(chip, LP5521_REG_ENABLE, LP5521_ENABLE_RUN_PROGRAM);
324 if (ret)
325 return ret;
326
327 lp5521_wait_enable_done();
328
329 return 0;
330}
331
332static int lp5521_run_selftest(struct lp55xx_chip *chip, char *buf)
333{
334 struct lp55xx_platform_data *pdata = chip->pdata;
335 int ret;
336 u8 status;
337
338 ret = lp55xx_read(chip, LP5521_REG_STATUS, &status);
339 if (ret < 0)
340 return ret;
341
342 if (pdata->clock_mode != LP55XX_CLOCK_EXT)
343 return 0;
344
345 /* Check that ext clock is really in use if requested */
346 if ((status & LP5521_EXT_CLK_USED) == 0)
347 return -EIO;
348
349 return 0;
350}
351
352static int lp5521_multicolor_brightness(struct lp55xx_led *led)
353{
354 struct lp55xx_chip *chip = led->chip;
355 int ret;
356 int i;
357
358 mutex_lock(&chip->lock);
359 for (i = 0; i < led->mc_cdev.num_colors; i++) {
360 ret = lp55xx_write(chip,
361 LP5521_REG_LED_PWM_BASE +
362 led->mc_cdev.subled_info[i].channel,
363 led->mc_cdev.subled_info[i].brightness);
364 if (ret)
365 break;
366 }
367 mutex_unlock(&chip->lock);
368 return ret;
369}
370
371static int lp5521_led_brightness(struct lp55xx_led *led)
372{
373 struct lp55xx_chip *chip = led->chip;
374 int ret;
375
376 mutex_lock(&chip->lock);
377 ret = lp55xx_write(chip, LP5521_REG_LED_PWM_BASE + led->chan_nr,
378 led->brightness);
379 mutex_unlock(&chip->lock);
380
381 return ret;
382}
383
384static ssize_t show_engine_mode(struct device *dev,
385 struct device_attribute *attr,
386 char *buf, int nr)
387{
388 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
389 struct lp55xx_chip *chip = led->chip;
390 enum lp55xx_engine_mode mode = chip->engines[nr - 1].mode;
391
392 switch (mode) {
393 case LP55XX_ENGINE_RUN:
394 return sprintf(buf, "run\n");
395 case LP55XX_ENGINE_LOAD:
396 return sprintf(buf, "load\n");
397 case LP55XX_ENGINE_DISABLED:
398 default:
399 return sprintf(buf, "disabled\n");
400 }
401}
402show_mode(1)
403show_mode(2)
404show_mode(3)
405
406static ssize_t store_engine_mode(struct device *dev,
407 struct device_attribute *attr,
408 const char *buf, size_t len, int nr)
409{
410 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
411 struct lp55xx_chip *chip = led->chip;
412 struct lp55xx_engine *engine = &chip->engines[nr - 1];
413
414 mutex_lock(&chip->lock);
415
416 chip->engine_idx = nr;
417
418 if (!strncmp(buf, "run", 3)) {
419 lp5521_run_engine(chip, true);
420 engine->mode = LP55XX_ENGINE_RUN;
421 } else if (!strncmp(buf, "load", 4)) {
422 lp5521_stop_engine(chip);
423 lp5521_load_engine(chip);
424 engine->mode = LP55XX_ENGINE_LOAD;
425 } else if (!strncmp(buf, "disabled", 8)) {
426 lp5521_stop_engine(chip);
427 engine->mode = LP55XX_ENGINE_DISABLED;
428 }
429
430 mutex_unlock(&chip->lock);
431
432 return len;
433}
434store_mode(1)
435store_mode(2)
436store_mode(3)
437
438static ssize_t store_engine_load(struct device *dev,
439 struct device_attribute *attr,
440 const char *buf, size_t len, int nr)
441{
442 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
443 struct lp55xx_chip *chip = led->chip;
444 int ret;
445
446 mutex_lock(&chip->lock);
447
448 chip->engine_idx = nr;
449 lp5521_load_engine(chip);
450 ret = lp5521_update_program_memory(chip, buf, len);
451
452 mutex_unlock(&chip->lock);
453
454 return ret;
455}
456store_load(1)
457store_load(2)
458store_load(3)
459
460static ssize_t lp5521_selftest(struct device *dev,
461 struct device_attribute *attr,
462 char *buf)
463{
464 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
465 struct lp55xx_chip *chip = led->chip;
466 int ret;
467
468 mutex_lock(&chip->lock);
469 ret = lp5521_run_selftest(chip, buf);
470 mutex_unlock(&chip->lock);
471
472 return scnprintf(buf, PAGE_SIZE, "%s\n", ret ? "FAIL" : "OK");
473}
474
475/* device attributes */
476static LP55XX_DEV_ATTR_RW(engine1_mode, show_engine1_mode, store_engine1_mode);
477static LP55XX_DEV_ATTR_RW(engine2_mode, show_engine2_mode, store_engine2_mode);
478static LP55XX_DEV_ATTR_RW(engine3_mode, show_engine3_mode, store_engine3_mode);
479static LP55XX_DEV_ATTR_WO(engine1_load, store_engine1_load);
480static LP55XX_DEV_ATTR_WO(engine2_load, store_engine2_load);
481static LP55XX_DEV_ATTR_WO(engine3_load, store_engine3_load);
482static LP55XX_DEV_ATTR_RO(selftest, lp5521_selftest);
483
484static struct attribute *lp5521_attributes[] = {
485 &dev_attr_engine1_mode.attr,
486 &dev_attr_engine2_mode.attr,
487 &dev_attr_engine3_mode.attr,
488 &dev_attr_engine1_load.attr,
489 &dev_attr_engine2_load.attr,
490 &dev_attr_engine3_load.attr,
491 &dev_attr_selftest.attr,
492 NULL
493};
494
495static const struct attribute_group lp5521_group = {
496 .attrs = lp5521_attributes,
497};
498
499/* Chip specific configurations */
500static struct lp55xx_device_config lp5521_cfg = {
501 .reset = {
502 .addr = LP5521_REG_RESET,
503 .val = LP5521_RESET,
504 },
505 .enable = {
506 .addr = LP5521_REG_ENABLE,
507 .val = LP5521_ENABLE_DEFAULT,
508 },
509 .max_channel = LP5521_MAX_LEDS,
510 .post_init_device = lp5521_post_init_device,
511 .brightness_fn = lp5521_led_brightness,
512 .multicolor_brightness_fn = lp5521_multicolor_brightness,
513 .set_led_current = lp5521_set_led_current,
514 .firmware_cb = lp5521_firmware_loaded,
515 .run_engine = lp5521_run_engine,
516 .dev_attr_group = &lp5521_group,
517};
518
519static int lp5521_probe(struct i2c_client *client,
520 const struct i2c_device_id *id)
521{
522 int ret;
523 struct lp55xx_chip *chip;
524 struct lp55xx_led *led;
525 struct lp55xx_platform_data *pdata = dev_get_platdata(&client->dev);
526 struct device_node *np = client->dev.of_node;
527
528 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
529 if (!chip)
530 return -ENOMEM;
531
532 chip->cfg = &lp5521_cfg;
533
534 if (!pdata) {
535 if (np) {
536 pdata = lp55xx_of_populate_pdata(&client->dev, np,
537 chip);
538 if (IS_ERR(pdata))
539 return PTR_ERR(pdata);
540 } else {
541 dev_err(&client->dev, "no platform data\n");
542 return -EINVAL;
543 }
544 }
545
546 led = devm_kcalloc(&client->dev,
547 pdata->num_channels, sizeof(*led), GFP_KERNEL);
548 if (!led)
549 return -ENOMEM;
550
551 chip->cl = client;
552 chip->pdata = pdata;
553
554 mutex_init(&chip->lock);
555
556 i2c_set_clientdata(client, led);
557
558 ret = lp55xx_init_device(chip);
559 if (ret)
560 goto err_init;
561
562 dev_info(&client->dev, "%s programmable led chip found\n", id->name);
563
564 ret = lp55xx_register_leds(led, chip);
565 if (ret)
566 goto err_out;
567
568 ret = lp55xx_register_sysfs(chip);
569 if (ret) {
570 dev_err(&client->dev, "registering sysfs failed\n");
571 goto err_out;
572 }
573
574 return 0;
575
576err_out:
577 lp55xx_deinit_device(chip);
578err_init:
579 return ret;
580}
581
582static int lp5521_remove(struct i2c_client *client)
583{
584 struct lp55xx_led *led = i2c_get_clientdata(client);
585 struct lp55xx_chip *chip = led->chip;
586
587 lp5521_stop_all_engines(chip);
588 lp55xx_unregister_sysfs(chip);
589 lp55xx_deinit_device(chip);
590
591 return 0;
592}
593
594static const struct i2c_device_id lp5521_id[] = {
595 { "lp5521", 0 }, /* Three channel chip */
596 { }
597};
598MODULE_DEVICE_TABLE(i2c, lp5521_id);
599
600#ifdef CONFIG_OF
601static const struct of_device_id of_lp5521_leds_match[] = {
602 { .compatible = "national,lp5521", },
603 {},
604};
605
606MODULE_DEVICE_TABLE(of, of_lp5521_leds_match);
607#endif
608static struct i2c_driver lp5521_driver = {
609 .driver = {
610 .name = "lp5521",
611 .of_match_table = of_match_ptr(of_lp5521_leds_match),
612 },
613 .probe = lp5521_probe,
614 .remove = lp5521_remove,
615 .id_table = lp5521_id,
616};
617
618module_i2c_driver(lp5521_driver);
619
620MODULE_AUTHOR("Mathias Nyman, Yuri Zaporozhets, Samu Onkalo");
621MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
622MODULE_DESCRIPTION("LP5521 LED engine");
623MODULE_LICENSE("GPL v2");