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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/*
2 * LP5521 LED chip driver.
3 *
4 * Copyright (C) 2010 Nokia Corporation
5 * Copyright (C) 2012 Texas Instruments
6 *
7 * Contact: Samu Onkalo <samu.p.onkalo@nokia.com>
8 * Milo(Woogyom) Kim <milo.kim@ti.com>
9 *
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
25#include <linux/delay.h>
26#include <linux/firmware.h>
27#include <linux/i2c.h>
28#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>
33#include <linux/of.h>
34
35#include "leds-lp55xx-common.h"
36
37#define LP5521_PROGRAM_LENGTH 32
38#define LP5521_MAX_LEDS 3
39#define LP5521_CMD_DIRECT 0x3F
40
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
51#define LP5521_REG_STATUS 0x0C
52#define LP5521_REG_RESET 0x0D
53#define LP5521_REG_R_PROG_MEM 0x10
54#define LP5521_REG_G_PROG_MEM 0x30
55#define LP5521_REG_B_PROG_MEM 0x50
56
57/* Base register to set LED current */
58#define LP5521_REG_LED_CURRENT_BASE LP5521_REG_R_CURRENT
59/* 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
66#define LP5521_ENABLE_DEFAULT \
67 (LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM)
68#define LP5521_ENABLE_RUN_PROGRAM \
69 (LP5521_ENABLE_DEFAULT | LP5521_EXEC_RUN)
70
71/* 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
83/* Status */
84#define LP5521_EXT_CLK_USED 0x08
85
86/* default R channel current register value */
87#define LP5521_REG_R_CURR_DEFAULT 0xAF
88
89/* Reset register value */
90#define LP5521_RESET 0xFF
91
92/* 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
114
115static 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
121static 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
127static 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
134static void lp5521_load_engine(struct lp55xx_chip *chip)
135{
136 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 };
142
143 u8 val[] = {
144 [LP55XX_ENGINE_1] = LP5521_LOAD_R,
145 [LP55XX_ENGINE_2] = LP5521_LOAD_G,
146 [LP55XX_ENGINE_3] = LP5521_LOAD_B,
147 };
148
149 lp55xx_update_bits(chip, LP5521_REG_OP_MODE, mask[idx], val[idx]);
150
151 lp5521_wait_opmode_done();
152}
153
154static void lp5521_stop_all_engines(struct lp55xx_chip *chip)
155{
156 lp55xx_write(chip, LP5521_REG_OP_MODE, 0);
157 lp5521_wait_opmode_done();
158}
159
160static 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
174static void lp5521_run_engine(struct lp55xx_chip *chip, bool start)
175{
176 int ret;
177 u8 mode;
178 u8 exec;
179
180 /* 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);
194 if (ret)
195 return;
196
197 ret = lp55xx_read(chip, LP5521_REG_ENABLE, &exec);
198 if (ret)
199 return;
200
201 /* 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 }
206
207 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 }
211
212 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];
236 int nrchars;
237 int ret;
238 int offset = 0;
239 int i = 0;
240
241 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
260 for (i = 0; i < LP5521_PROGRAM_LENGTH; i++) {
261 ret = lp55xx_write(chip, addr[idx] + i, pattern[i]);
262 if (ret)
263 return -EINVAL;
264 }
265
266 return size;
267
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);
291}
292
293static int lp5521_post_init_device(struct lp55xx_chip *chip)
294{
295 int ret;
296 u8 val;
297
298 /*
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 */
304 ret = lp55xx_read(chip, LP5521_REG_R_CURRENT, &val);
305 if (ret) {
306 dev_err(&chip->cl->dev, "error in resetting chip\n");
307 return ret;
308 }
309 if (val != LP5521_REG_R_CURR_DEFAULT) {
310 dev_err(&chip->cl->dev,
311 "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);
317
318 /* Set all PWMs to direct control mode */
319 ret = lp55xx_write(chip, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
320
321 /* Update configuration for the clock setting */
322 val = LP5521_DEFAULT_CFG;
323 if (!lp55xx_is_extclk_used(chip))
324 val |= LP5521_CLK_INT;
325
326 ret = lp55xx_write(chip, LP5521_REG_CONFIG, val);
327 if (ret)
328 return ret;
329
330 /* Initialize all channels PWM to zero -> leds off */
331 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);
334
335 /* Set engines are set to run state when OP_MODE enables engines */
336 ret = lp55xx_write(chip, LP5521_REG_ENABLE, LP5521_ENABLE_RUN_PROGRAM);
337 if (ret)
338 return ret;
339
340 lp5521_wait_enable_done();
341
342 return 0;
343}
344
345static int lp5521_run_selftest(struct lp55xx_chip *chip, char *buf)
346{
347 struct lp55xx_platform_data *pdata = chip->pdata;
348 int ret;
349 u8 status;
350
351 ret = lp55xx_read(chip, LP5521_REG_STATUS, &status);
352 if (ret < 0)
353 return ret;
354
355 if (pdata->clock_mode != LP55XX_CLOCK_EXT)
356 return 0;
357
358 /* Check that ext clock is really in use if requested */
359 if ((status & LP5521_EXT_CLK_USED) == 0)
360 return -EIO;
361
362 return 0;
363}
364
365static int lp5521_led_brightness(struct lp55xx_led *led)
366{
367 struct lp55xx_chip *chip = led->chip;
368 int ret;
369
370 mutex_lock(&chip->lock);
371 ret = lp55xx_write(chip, LP5521_REG_LED_PWM_BASE + led->chan_nr,
372 led->brightness);
373 mutex_unlock(&chip->lock);
374
375 return ret;
376}
377
378static ssize_t show_engine_mode(struct device *dev,
379 struct device_attribute *attr,
380 char *buf, int nr)
381{
382 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
383 struct lp55xx_chip *chip = led->chip;
384 enum lp55xx_engine_mode mode = chip->engines[nr - 1].mode;
385
386 switch (mode) {
387 case LP55XX_ENGINE_RUN:
388 return sprintf(buf, "run\n");
389 case LP55XX_ENGINE_LOAD:
390 return sprintf(buf, "load\n");
391 case LP55XX_ENGINE_DISABLED:
392 default:
393 return sprintf(buf, "disabled\n");
394 }
395}
396show_mode(1)
397show_mode(2)
398show_mode(3)
399
400static ssize_t store_engine_mode(struct device *dev,
401 struct device_attribute *attr,
402 const char *buf, size_t len, int nr)
403{
404 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
405 struct lp55xx_chip *chip = led->chip;
406 struct lp55xx_engine *engine = &chip->engines[nr - 1];
407
408 mutex_lock(&chip->lock);
409
410 chip->engine_idx = nr;
411
412 if (!strncmp(buf, "run", 3)) {
413 lp5521_run_engine(chip, true);
414 engine->mode = LP55XX_ENGINE_RUN;
415 } else if (!strncmp(buf, "load", 4)) {
416 lp5521_stop_engine(chip);
417 lp5521_load_engine(chip);
418 engine->mode = LP55XX_ENGINE_LOAD;
419 } else if (!strncmp(buf, "disabled", 8)) {
420 lp5521_stop_engine(chip);
421 engine->mode = LP55XX_ENGINE_DISABLED;
422 }
423
424 mutex_unlock(&chip->lock);
425
426 return len;
427}
428store_mode(1)
429store_mode(2)
430store_mode(3)
431
432static ssize_t store_engine_load(struct device *dev,
433 struct device_attribute *attr,
434 const char *buf, size_t len, int nr)
435{
436 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
437 struct lp55xx_chip *chip = led->chip;
438 int ret;
439
440 mutex_lock(&chip->lock);
441
442 chip->engine_idx = nr;
443 lp5521_load_engine(chip);
444 ret = lp5521_update_program_memory(chip, buf, len);
445
446 mutex_unlock(&chip->lock);
447
448 return ret;
449}
450store_load(1)
451store_load(2)
452store_load(3)
453
454static ssize_t lp5521_selftest(struct device *dev,
455 struct device_attribute *attr,
456 char *buf)
457{
458 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
459 struct lp55xx_chip *chip = led->chip;
460 int ret;
461
462 mutex_lock(&chip->lock);
463 ret = lp5521_run_selftest(chip, buf);
464 mutex_unlock(&chip->lock);
465
466 return scnprintf(buf, PAGE_SIZE, "%s\n", ret ? "FAIL" : "OK");
467}
468
469/* device attributes */
470static LP55XX_DEV_ATTR_RW(engine1_mode, show_engine1_mode, store_engine1_mode);
471static LP55XX_DEV_ATTR_RW(engine2_mode, show_engine2_mode, store_engine2_mode);
472static LP55XX_DEV_ATTR_RW(engine3_mode, show_engine3_mode, store_engine3_mode);
473static LP55XX_DEV_ATTR_WO(engine1_load, store_engine1_load);
474static LP55XX_DEV_ATTR_WO(engine2_load, store_engine2_load);
475static LP55XX_DEV_ATTR_WO(engine3_load, store_engine3_load);
476static LP55XX_DEV_ATTR_RO(selftest, lp5521_selftest);
477
478static struct attribute *lp5521_attributes[] = {
479 &dev_attr_engine1_mode.attr,
480 &dev_attr_engine2_mode.attr,
481 &dev_attr_engine3_mode.attr,
482 &dev_attr_engine1_load.attr,
483 &dev_attr_engine2_load.attr,
484 &dev_attr_engine3_load.attr,
485 &dev_attr_selftest.attr,
486 NULL
487};
488
489static const struct attribute_group lp5521_group = {
490 .attrs = lp5521_attributes,
491};
492
493/* Chip specific configurations */
494static struct lp55xx_device_config lp5521_cfg = {
495 .reset = {
496 .addr = LP5521_REG_RESET,
497 .val = LP5521_RESET,
498 },
499 .enable = {
500 .addr = LP5521_REG_ENABLE,
501 .val = LP5521_ENABLE_DEFAULT,
502 },
503 .max_channel = LP5521_MAX_LEDS,
504 .post_init_device = lp5521_post_init_device,
505 .brightness_fn = lp5521_led_brightness,
506 .set_led_current = lp5521_set_led_current,
507 .firmware_cb = lp5521_firmware_loaded,
508 .run_engine = lp5521_run_engine,
509 .dev_attr_group = &lp5521_group,
510};
511
512static int lp5521_probe(struct i2c_client *client,
513 const struct i2c_device_id *id)
514{
515 int ret;
516 struct lp55xx_chip *chip;
517 struct lp55xx_led *led;
518 struct lp55xx_platform_data *pdata = dev_get_platdata(&client->dev);
519 struct device_node *np = client->dev.of_node;
520
521 if (!pdata) {
522 if (np) {
523 pdata = lp55xx_of_populate_pdata(&client->dev, np);
524 if (IS_ERR(pdata))
525 return PTR_ERR(pdata);
526 } else {
527 dev_err(&client->dev, "no platform data\n");
528 return -EINVAL;
529 }
530 }
531
532 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
533 if (!chip)
534 return -ENOMEM;
535
536 led = devm_kzalloc(&client->dev,
537 sizeof(*led) * pdata->num_channels, GFP_KERNEL);
538 if (!led)
539 return -ENOMEM;
540
541 chip->cl = client;
542 chip->pdata = pdata;
543 chip->cfg = &lp5521_cfg;
544
545 mutex_init(&chip->lock);
546
547 i2c_set_clientdata(client, led);
548
549 ret = lp55xx_init_device(chip);
550 if (ret)
551 goto err_init;
552
553 dev_info(&client->dev, "%s programmable led chip found\n", id->name);
554
555 ret = lp55xx_register_leds(led, chip);
556 if (ret)
557 goto err_register_leds;
558
559 ret = lp55xx_register_sysfs(chip);
560 if (ret) {
561 dev_err(&client->dev, "registering sysfs failed\n");
562 goto err_register_sysfs;
563 }
564
565 return 0;
566
567err_register_sysfs:
568 lp55xx_unregister_leds(led, chip);
569err_register_leds:
570 lp55xx_deinit_device(chip);
571err_init:
572 return ret;
573}
574
575static int lp5521_remove(struct i2c_client *client)
576{
577 struct lp55xx_led *led = i2c_get_clientdata(client);
578 struct lp55xx_chip *chip = led->chip;
579
580 lp5521_stop_all_engines(chip);
581 lp55xx_unregister_sysfs(chip);
582 lp55xx_unregister_leds(led, chip);
583 lp55xx_deinit_device(chip);
584
585 return 0;
586}
587
588static const struct i2c_device_id lp5521_id[] = {
589 { "lp5521", 0 }, /* Three channel chip */
590 { }
591};
592MODULE_DEVICE_TABLE(i2c, lp5521_id);
593
594#ifdef CONFIG_OF
595static const struct of_device_id of_lp5521_leds_match[] = {
596 { .compatible = "national,lp5521", },
597 {},
598};
599
600MODULE_DEVICE_TABLE(of, of_lp5521_leds_match);
601#endif
602static struct i2c_driver lp5521_driver = {
603 .driver = {
604 .name = "lp5521",
605 .of_match_table = of_match_ptr(of_lp5521_leds_match),
606 },
607 .probe = lp5521_probe,
608 .remove = lp5521_remove,
609 .id_table = lp5521_id,
610};
611
612module_i2c_driver(lp5521_driver);
613
614MODULE_AUTHOR("Mathias Nyman, Yuri Zaporozhets, Samu Onkalo");
615MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
616MODULE_DESCRIPTION("LP5521 LED engine");
617MODULE_LICENSE("GPL v2");