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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 *
6 * Contact: Samu Onkalo <samu.p.onkalo@nokia.com>
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * version 2 as published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20 * 02110-1301 USA
21 */
22
23#include <linux/module.h>
24#include <linux/init.h>
25#include <linux/i2c.h>
26#include <linux/mutex.h>
27#include <linux/gpio.h>
28#include <linux/interrupt.h>
29#include <linux/delay.h>
30#include <linux/ctype.h>
31#include <linux/spinlock.h>
32#include <linux/wait.h>
33#include <linux/leds.h>
34#include <linux/leds-lp5521.h>
35#include <linux/workqueue.h>
36#include <linux/slab.h>
37
38#define LP5521_PROGRAM_LENGTH 32 /* in bytes */
39
40#define LP5521_MAX_LEDS 3 /* Maximum number of LEDs */
41#define LP5521_MAX_ENGINES 3 /* Maximum number of engines */
42
43#define LP5521_ENG_MASK_BASE 0x30 /* 00110000 */
44#define LP5521_ENG_STATUS_MASK 0x07 /* 00000111 */
45
46#define LP5521_CMD_LOAD 0x15 /* 00010101 */
47#define LP5521_CMD_RUN 0x2a /* 00101010 */
48#define LP5521_CMD_DIRECT 0x3f /* 00111111 */
49#define LP5521_CMD_DISABLED 0x00 /* 00000000 */
50
51/* Registers */
52#define LP5521_REG_ENABLE 0x00
53#define LP5521_REG_OP_MODE 0x01
54#define LP5521_REG_R_PWM 0x02
55#define LP5521_REG_G_PWM 0x03
56#define LP5521_REG_B_PWM 0x04
57#define LP5521_REG_R_CURRENT 0x05
58#define LP5521_REG_G_CURRENT 0x06
59#define LP5521_REG_B_CURRENT 0x07
60#define LP5521_REG_CONFIG 0x08
61#define LP5521_REG_R_CHANNEL_PC 0x09
62#define LP5521_REG_G_CHANNEL_PC 0x0A
63#define LP5521_REG_B_CHANNEL_PC 0x0B
64#define LP5521_REG_STATUS 0x0C
65#define LP5521_REG_RESET 0x0D
66#define LP5521_REG_GPO 0x0E
67#define LP5521_REG_R_PROG_MEM 0x10
68#define LP5521_REG_G_PROG_MEM 0x30
69#define LP5521_REG_B_PROG_MEM 0x50
70
71#define LP5521_PROG_MEM_BASE LP5521_REG_R_PROG_MEM
72#define LP5521_PROG_MEM_SIZE 0x20
73
74/* Base register to set LED current */
75#define LP5521_REG_LED_CURRENT_BASE LP5521_REG_R_CURRENT
76
77/* Base register to set the brightness */
78#define LP5521_REG_LED_PWM_BASE LP5521_REG_R_PWM
79
80/* Bits in ENABLE register */
81#define LP5521_MASTER_ENABLE 0x40 /* Chip master enable */
82#define LP5521_LOGARITHMIC_PWM 0x80 /* Logarithmic PWM adjustment */
83#define LP5521_EXEC_RUN 0x2A
84
85/* Bits in CONFIG register */
86#define LP5521_PWM_HF 0x40 /* PWM: 0 = 256Hz, 1 = 558Hz */
87#define LP5521_PWRSAVE_EN 0x20 /* 1 = Power save mode */
88#define LP5521_CP_MODE_OFF 0 /* Charge pump (CP) off */
89#define LP5521_CP_MODE_BYPASS 8 /* CP forced to bypass mode */
90#define LP5521_CP_MODE_1X5 0x10 /* CP forced to 1.5x mode */
91#define LP5521_CP_MODE_AUTO 0x18 /* Automatic mode selection */
92#define LP5521_R_TO_BATT 4 /* R out: 0 = CP, 1 = Vbat */
93#define LP5521_CLK_SRC_EXT 0 /* Ext-clk source (CLK_32K) */
94#define LP5521_CLK_INT 1 /* Internal clock */
95#define LP5521_CLK_AUTO 2 /* Automatic clock selection */
96
97/* Status */
98#define LP5521_EXT_CLK_USED 0x08
99
100struct lp5521_engine {
101 int id;
102 u8 mode;
103 u8 prog_page;
104 u8 engine_mask;
105};
106
107struct lp5521_led {
108 int id;
109 u8 chan_nr;
110 u8 led_current;
111 u8 max_current;
112 struct led_classdev cdev;
113 struct work_struct brightness_work;
114 u8 brightness;
115};
116
117struct lp5521_chip {
118 struct lp5521_platform_data *pdata;
119 struct mutex lock; /* Serialize control */
120 struct i2c_client *client;
121 struct lp5521_engine engines[LP5521_MAX_ENGINES];
122 struct lp5521_led leds[LP5521_MAX_LEDS];
123 u8 num_channels;
124 u8 num_leds;
125};
126
127static inline struct lp5521_led *cdev_to_led(struct led_classdev *cdev)
128{
129 return container_of(cdev, struct lp5521_led, cdev);
130}
131
132static inline struct lp5521_chip *engine_to_lp5521(struct lp5521_engine *engine)
133{
134 return container_of(engine, struct lp5521_chip,
135 engines[engine->id - 1]);
136}
137
138static inline struct lp5521_chip *led_to_lp5521(struct lp5521_led *led)
139{
140 return container_of(led, struct lp5521_chip,
141 leds[led->id]);
142}
143
144static void lp5521_led_brightness_work(struct work_struct *work);
145
146static inline int lp5521_write(struct i2c_client *client, u8 reg, u8 value)
147{
148 return i2c_smbus_write_byte_data(client, reg, value);
149}
150
151static int lp5521_read(struct i2c_client *client, u8 reg, u8 *buf)
152{
153 s32 ret;
154
155 ret = i2c_smbus_read_byte_data(client, reg);
156 if (ret < 0)
157 return -EIO;
158
159 *buf = ret;
160 return 0;
161}
162
163static int lp5521_set_engine_mode(struct lp5521_engine *engine, u8 mode)
164{
165 struct lp5521_chip *chip = engine_to_lp5521(engine);
166 struct i2c_client *client = chip->client;
167 int ret;
168 u8 engine_state;
169
170 /* Only transition between RUN and DIRECT mode are handled here */
171 if (mode == LP5521_CMD_LOAD)
172 return 0;
173
174 if (mode == LP5521_CMD_DISABLED)
175 mode = LP5521_CMD_DIRECT;
176
177 ret = lp5521_read(client, LP5521_REG_OP_MODE, &engine_state);
178
179 /* set mode only for this engine */
180 engine_state &= ~(engine->engine_mask);
181 mode &= engine->engine_mask;
182 engine_state |= mode;
183 ret |= lp5521_write(client, LP5521_REG_OP_MODE, engine_state);
184
185 return ret;
186}
187
188static int lp5521_load_program(struct lp5521_engine *eng, const u8 *pattern)
189{
190 struct lp5521_chip *chip = engine_to_lp5521(eng);
191 struct i2c_client *client = chip->client;
192 int ret;
193 int addr;
194 u8 mode;
195
196 /* move current engine to direct mode and remember the state */
197 ret = lp5521_set_engine_mode(eng, LP5521_CMD_DIRECT);
198 /* Mode change requires min 500 us delay. 1 - 2 ms with margin */
199 usleep_range(1000, 2000);
200 ret |= lp5521_read(client, LP5521_REG_OP_MODE, &mode);
201
202 /* For loading, all the engines to load mode */
203 lp5521_write(client, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
204 /* Mode change requires min 500 us delay. 1 - 2 ms with margin */
205 usleep_range(1000, 2000);
206 lp5521_write(client, LP5521_REG_OP_MODE, LP5521_CMD_LOAD);
207 /* Mode change requires min 500 us delay. 1 - 2 ms with margin */
208 usleep_range(1000, 2000);
209
210 addr = LP5521_PROG_MEM_BASE + eng->prog_page * LP5521_PROG_MEM_SIZE;
211 i2c_smbus_write_i2c_block_data(client,
212 addr,
213 LP5521_PROG_MEM_SIZE,
214 pattern);
215
216 ret |= lp5521_write(client, LP5521_REG_OP_MODE, mode);
217 return ret;
218}
219
220static int lp5521_set_led_current(struct lp5521_chip *chip, int led, u8 curr)
221{
222 return lp5521_write(chip->client,
223 LP5521_REG_LED_CURRENT_BASE + chip->leds[led].chan_nr,
224 curr);
225}
226
227static void lp5521_init_engine(struct lp5521_chip *chip)
228{
229 int i;
230 for (i = 0; i < ARRAY_SIZE(chip->engines); i++) {
231 chip->engines[i].id = i + 1;
232 chip->engines[i].engine_mask = LP5521_ENG_MASK_BASE >> (i * 2);
233 chip->engines[i].prog_page = i;
234 }
235}
236
237static int lp5521_configure(struct i2c_client *client)
238{
239 struct lp5521_chip *chip = i2c_get_clientdata(client);
240 int ret;
241
242 lp5521_init_engine(chip);
243
244 /* Set all PWMs to direct control mode */
245 ret = lp5521_write(client, LP5521_REG_OP_MODE, 0x3F);
246
247 /* Enable auto-powersave, set charge pump to auto, red to battery */
248 ret |= lp5521_write(client, LP5521_REG_CONFIG,
249 LP5521_PWRSAVE_EN | LP5521_CP_MODE_AUTO | LP5521_R_TO_BATT);
250
251 /* Initialize all channels PWM to zero -> leds off */
252 ret |= lp5521_write(client, LP5521_REG_R_PWM, 0);
253 ret |= lp5521_write(client, LP5521_REG_G_PWM, 0);
254 ret |= lp5521_write(client, LP5521_REG_B_PWM, 0);
255
256 /* Set engines are set to run state when OP_MODE enables engines */
257 ret |= lp5521_write(client, LP5521_REG_ENABLE,
258 LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM |
259 LP5521_EXEC_RUN);
260 /* enable takes 500us. 1 - 2 ms leaves some margin */
261 usleep_range(1000, 2000);
262
263 return ret;
264}
265
266static int lp5521_run_selftest(struct lp5521_chip *chip, char *buf)
267{
268 int ret;
269 u8 status;
270
271 ret = lp5521_read(chip->client, LP5521_REG_STATUS, &status);
272 if (ret < 0)
273 return ret;
274
275 /* Check that ext clock is really in use if requested */
276 if (chip->pdata && chip->pdata->clock_mode == LP5521_CLOCK_EXT)
277 if ((status & LP5521_EXT_CLK_USED) == 0)
278 return -EIO;
279 return 0;
280}
281
282static void lp5521_set_brightness(struct led_classdev *cdev,
283 enum led_brightness brightness)
284{
285 struct lp5521_led *led = cdev_to_led(cdev);
286 led->brightness = (u8)brightness;
287 schedule_work(&led->brightness_work);
288}
289
290static void lp5521_led_brightness_work(struct work_struct *work)
291{
292 struct lp5521_led *led = container_of(work,
293 struct lp5521_led,
294 brightness_work);
295 struct lp5521_chip *chip = led_to_lp5521(led);
296 struct i2c_client *client = chip->client;
297
298 mutex_lock(&chip->lock);
299 lp5521_write(client, LP5521_REG_LED_PWM_BASE + led->chan_nr,
300 led->brightness);
301 mutex_unlock(&chip->lock);
302}
303
304/* Detect the chip by setting its ENABLE register and reading it back. */
305static int lp5521_detect(struct i2c_client *client)
306{
307 int ret;
308 u8 buf;
309
310 ret = lp5521_write(client, LP5521_REG_ENABLE,
311 LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM);
312 if (ret)
313 return ret;
314 /* enable takes 500us. 1 - 2 ms leaves some margin */
315 usleep_range(1000, 2000);
316 ret = lp5521_read(client, LP5521_REG_ENABLE, &buf);
317 if (ret)
318 return ret;
319 if (buf != (LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM))
320 return -ENODEV;
321
322 return 0;
323}
324
325/* Set engine mode and create appropriate sysfs attributes, if required. */
326static int lp5521_set_mode(struct lp5521_engine *engine, u8 mode)
327{
328 int ret = 0;
329
330 /* if in that mode already do nothing, except for run */
331 if (mode == engine->mode && mode != LP5521_CMD_RUN)
332 return 0;
333
334 if (mode == LP5521_CMD_RUN) {
335 ret = lp5521_set_engine_mode(engine, LP5521_CMD_RUN);
336 } else if (mode == LP5521_CMD_LOAD) {
337 lp5521_set_engine_mode(engine, LP5521_CMD_DISABLED);
338 lp5521_set_engine_mode(engine, LP5521_CMD_LOAD);
339 } else if (mode == LP5521_CMD_DISABLED) {
340 lp5521_set_engine_mode(engine, LP5521_CMD_DISABLED);
341 }
342
343 engine->mode = mode;
344
345 return ret;
346}
347
348static int lp5521_do_store_load(struct lp5521_engine *engine,
349 const char *buf, size_t len)
350{
351 struct lp5521_chip *chip = engine_to_lp5521(engine);
352 struct i2c_client *client = chip->client;
353 int ret, nrchars, offset = 0, i = 0;
354 char c[3];
355 unsigned cmd;
356 u8 pattern[LP5521_PROGRAM_LENGTH] = {0};
357
358 while ((offset < len - 1) && (i < LP5521_PROGRAM_LENGTH)) {
359 /* separate sscanfs because length is working only for %s */
360 ret = sscanf(buf + offset, "%2s%n ", c, &nrchars);
361 if (ret != 2)
362 goto fail;
363 ret = sscanf(c, "%2x", &cmd);
364 if (ret != 1)
365 goto fail;
366 pattern[i] = (u8)cmd;
367
368 offset += nrchars;
369 i++;
370 }
371
372 /* Each instruction is 16bit long. Check that length is even */
373 if (i % 2)
374 goto fail;
375
376 mutex_lock(&chip->lock);
377 if (engine->mode == LP5521_CMD_LOAD)
378 ret = lp5521_load_program(engine, pattern);
379 else
380 ret = -EINVAL;
381 mutex_unlock(&chip->lock);
382
383 if (ret) {
384 dev_err(&client->dev, "failed loading pattern\n");
385 return ret;
386 }
387
388 return len;
389fail:
390 dev_err(&client->dev, "wrong pattern format\n");
391 return -EINVAL;
392}
393
394static ssize_t store_engine_load(struct device *dev,
395 struct device_attribute *attr,
396 const char *buf, size_t len, int nr)
397{
398 struct i2c_client *client = to_i2c_client(dev);
399 struct lp5521_chip *chip = i2c_get_clientdata(client);
400 return lp5521_do_store_load(&chip->engines[nr - 1], buf, len);
401}
402
403#define store_load(nr) \
404static ssize_t store_engine##nr##_load(struct device *dev, \
405 struct device_attribute *attr, \
406 const char *buf, size_t len) \
407{ \
408 return store_engine_load(dev, attr, buf, len, nr); \
409}
410store_load(1)
411store_load(2)
412store_load(3)
413
414static ssize_t show_engine_mode(struct device *dev,
415 struct device_attribute *attr,
416 char *buf, int nr)
417{
418 struct i2c_client *client = to_i2c_client(dev);
419 struct lp5521_chip *chip = i2c_get_clientdata(client);
420 switch (chip->engines[nr - 1].mode) {
421 case LP5521_CMD_RUN:
422 return sprintf(buf, "run\n");
423 case LP5521_CMD_LOAD:
424 return sprintf(buf, "load\n");
425 case LP5521_CMD_DISABLED:
426 return sprintf(buf, "disabled\n");
427 default:
428 return sprintf(buf, "disabled\n");
429 }
430}
431
432#define show_mode(nr) \
433static ssize_t show_engine##nr##_mode(struct device *dev, \
434 struct device_attribute *attr, \
435 char *buf) \
436{ \
437 return show_engine_mode(dev, attr, buf, nr); \
438}
439show_mode(1)
440show_mode(2)
441show_mode(3)
442
443static ssize_t store_engine_mode(struct device *dev,
444 struct device_attribute *attr,
445 const char *buf, size_t len, int nr)
446{
447 struct i2c_client *client = to_i2c_client(dev);
448 struct lp5521_chip *chip = i2c_get_clientdata(client);
449 struct lp5521_engine *engine = &chip->engines[nr - 1];
450 mutex_lock(&chip->lock);
451
452 if (!strncmp(buf, "run", 3))
453 lp5521_set_mode(engine, LP5521_CMD_RUN);
454 else if (!strncmp(buf, "load", 4))
455 lp5521_set_mode(engine, LP5521_CMD_LOAD);
456 else if (!strncmp(buf, "disabled", 8))
457 lp5521_set_mode(engine, LP5521_CMD_DISABLED);
458
459 mutex_unlock(&chip->lock);
460 return len;
461}
462
463#define store_mode(nr) \
464static ssize_t store_engine##nr##_mode(struct device *dev, \
465 struct device_attribute *attr, \
466 const char *buf, size_t len) \
467{ \
468 return store_engine_mode(dev, attr, buf, len, nr); \
469}
470store_mode(1)
471store_mode(2)
472store_mode(3)
473
474static ssize_t show_max_current(struct device *dev,
475 struct device_attribute *attr,
476 char *buf)
477{
478 struct led_classdev *led_cdev = dev_get_drvdata(dev);
479 struct lp5521_led *led = cdev_to_led(led_cdev);
480
481 return sprintf(buf, "%d\n", led->max_current);
482}
483
484static ssize_t show_current(struct device *dev,
485 struct device_attribute *attr,
486 char *buf)
487{
488 struct led_classdev *led_cdev = dev_get_drvdata(dev);
489 struct lp5521_led *led = cdev_to_led(led_cdev);
490
491 return sprintf(buf, "%d\n", led->led_current);
492}
493
494static ssize_t store_current(struct device *dev,
495 struct device_attribute *attr,
496 const char *buf, size_t len)
497{
498 struct led_classdev *led_cdev = dev_get_drvdata(dev);
499 struct lp5521_led *led = cdev_to_led(led_cdev);
500 struct lp5521_chip *chip = led_to_lp5521(led);
501 ssize_t ret;
502 unsigned long curr;
503
504 if (strict_strtoul(buf, 0, &curr))
505 return -EINVAL;
506
507 if (curr > led->max_current)
508 return -EINVAL;
509
510 mutex_lock(&chip->lock);
511 ret = lp5521_set_led_current(chip, led->id, curr);
512 mutex_unlock(&chip->lock);
513
514 if (ret < 0)
515 return ret;
516
517 led->led_current = (u8)curr;
518
519 return len;
520}
521
522static ssize_t lp5521_selftest(struct device *dev,
523 struct device_attribute *attr,
524 char *buf)
525{
526 struct i2c_client *client = to_i2c_client(dev);
527 struct lp5521_chip *chip = i2c_get_clientdata(client);
528 int ret;
529
530 mutex_lock(&chip->lock);
531 ret = lp5521_run_selftest(chip, buf);
532 mutex_unlock(&chip->lock);
533 return sprintf(buf, "%s\n", ret ? "FAIL" : "OK");
534}
535
536/* led class device attributes */
537static DEVICE_ATTR(led_current, S_IRUGO | S_IWUSR, show_current, store_current);
538static DEVICE_ATTR(max_current, S_IRUGO , show_max_current, NULL);
539
540static struct attribute *lp5521_led_attributes[] = {
541 &dev_attr_led_current.attr,
542 &dev_attr_max_current.attr,
543 NULL,
544};
545
546static struct attribute_group lp5521_led_attribute_group = {
547 .attrs = lp5521_led_attributes
548};
549
550/* device attributes */
551static DEVICE_ATTR(engine1_mode, S_IRUGO | S_IWUSR,
552 show_engine1_mode, store_engine1_mode);
553static DEVICE_ATTR(engine2_mode, S_IRUGO | S_IWUSR,
554 show_engine2_mode, store_engine2_mode);
555static DEVICE_ATTR(engine3_mode, S_IRUGO | S_IWUSR,
556 show_engine3_mode, store_engine3_mode);
557static DEVICE_ATTR(engine1_load, S_IWUSR, NULL, store_engine1_load);
558static DEVICE_ATTR(engine2_load, S_IWUSR, NULL, store_engine2_load);
559static DEVICE_ATTR(engine3_load, S_IWUSR, NULL, store_engine3_load);
560static DEVICE_ATTR(selftest, S_IRUGO, lp5521_selftest, NULL);
561
562static struct attribute *lp5521_attributes[] = {
563 &dev_attr_engine1_mode.attr,
564 &dev_attr_engine2_mode.attr,
565 &dev_attr_engine3_mode.attr,
566 &dev_attr_selftest.attr,
567 &dev_attr_engine1_load.attr,
568 &dev_attr_engine2_load.attr,
569 &dev_attr_engine3_load.attr,
570 NULL
571};
572
573static const struct attribute_group lp5521_group = {
574 .attrs = lp5521_attributes,
575};
576
577static int lp5521_register_sysfs(struct i2c_client *client)
578{
579 struct device *dev = &client->dev;
580 return sysfs_create_group(&dev->kobj, &lp5521_group);
581}
582
583static void lp5521_unregister_sysfs(struct i2c_client *client)
584{
585 struct lp5521_chip *chip = i2c_get_clientdata(client);
586 struct device *dev = &client->dev;
587 int i;
588
589 sysfs_remove_group(&dev->kobj, &lp5521_group);
590
591 for (i = 0; i < chip->num_leds; i++)
592 sysfs_remove_group(&chip->leds[i].cdev.dev->kobj,
593 &lp5521_led_attribute_group);
594}
595
596static int __devinit lp5521_init_led(struct lp5521_led *led,
597 struct i2c_client *client,
598 int chan, struct lp5521_platform_data *pdata)
599{
600 struct device *dev = &client->dev;
601 char name[32];
602 int res;
603
604 if (chan >= LP5521_MAX_LEDS)
605 return -EINVAL;
606
607 if (pdata->led_config[chan].led_current == 0)
608 return 0;
609
610 led->led_current = pdata->led_config[chan].led_current;
611 led->max_current = pdata->led_config[chan].max_current;
612 led->chan_nr = pdata->led_config[chan].chan_nr;
613
614 if (led->chan_nr >= LP5521_MAX_LEDS) {
615 dev_err(dev, "Use channel numbers between 0 and %d\n",
616 LP5521_MAX_LEDS - 1);
617 return -EINVAL;
618 }
619
620 snprintf(name, sizeof(name), "%s:channel%d",
621 pdata->label ?: client->name, chan);
622 led->cdev.brightness_set = lp5521_set_brightness;
623 led->cdev.name = name;
624 res = led_classdev_register(dev, &led->cdev);
625 if (res < 0) {
626 dev_err(dev, "couldn't register led on channel %d\n", chan);
627 return res;
628 }
629
630 res = sysfs_create_group(&led->cdev.dev->kobj,
631 &lp5521_led_attribute_group);
632 if (res < 0) {
633 dev_err(dev, "couldn't register current attribute\n");
634 led_classdev_unregister(&led->cdev);
635 return res;
636 }
637 return 0;
638}
639
640static int __devinit lp5521_probe(struct i2c_client *client,
641 const struct i2c_device_id *id)
642{
643 struct lp5521_chip *chip;
644 struct lp5521_platform_data *pdata;
645 int ret, i, led;
646
647 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
648 if (!chip)
649 return -ENOMEM;
650
651 i2c_set_clientdata(client, chip);
652 chip->client = client;
653
654 pdata = client->dev.platform_data;
655
656 if (!pdata) {
657 dev_err(&client->dev, "no platform data\n");
658 ret = -EINVAL;
659 goto fail1;
660 }
661
662 mutex_init(&chip->lock);
663
664 chip->pdata = pdata;
665
666 if (pdata->setup_resources) {
667 ret = pdata->setup_resources();
668 if (ret < 0)
669 goto fail1;
670 }
671
672 if (pdata->enable) {
673 pdata->enable(0);
674 usleep_range(1000, 2000); /* Keep enable down at least 1ms */
675 pdata->enable(1);
676 usleep_range(1000, 2000); /* 500us abs min. */
677 }
678
679 lp5521_write(client, LP5521_REG_RESET, 0xff);
680 usleep_range(10000, 20000); /*
681 * Exact value is not available. 10 - 20ms
682 * appears to be enough for reset.
683 */
684 ret = lp5521_detect(client);
685
686 if (ret) {
687 dev_err(&client->dev, "Chip not found\n");
688 goto fail2;
689 }
690
691 dev_info(&client->dev, "%s programmable led chip found\n", id->name);
692
693 ret = lp5521_configure(client);
694 if (ret < 0) {
695 dev_err(&client->dev, "error configuring chip\n");
696 goto fail2;
697 }
698
699 /* Initialize leds */
700 chip->num_channels = pdata->num_channels;
701 chip->num_leds = 0;
702 led = 0;
703 for (i = 0; i < pdata->num_channels; i++) {
704 /* Do not initialize channels that are not connected */
705 if (pdata->led_config[i].led_current == 0)
706 continue;
707
708 ret = lp5521_init_led(&chip->leds[led], client, i, pdata);
709 if (ret) {
710 dev_err(&client->dev, "error initializing leds\n");
711 goto fail3;
712 }
713 chip->num_leds++;
714
715 chip->leds[led].id = led;
716 /* Set initial LED current */
717 lp5521_set_led_current(chip, led,
718 chip->leds[led].led_current);
719
720 INIT_WORK(&(chip->leds[led].brightness_work),
721 lp5521_led_brightness_work);
722
723 led++;
724 }
725
726 ret = lp5521_register_sysfs(client);
727 if (ret) {
728 dev_err(&client->dev, "registering sysfs failed\n");
729 goto fail3;
730 }
731 return ret;
732fail3:
733 for (i = 0; i < chip->num_leds; i++) {
734 led_classdev_unregister(&chip->leds[i].cdev);
735 cancel_work_sync(&chip->leds[i].brightness_work);
736 }
737fail2:
738 if (pdata->enable)
739 pdata->enable(0);
740 if (pdata->release_resources)
741 pdata->release_resources();
742fail1:
743 kfree(chip);
744 return ret;
745}
746
747static int __devexit lp5521_remove(struct i2c_client *client)
748{
749 struct lp5521_chip *chip = i2c_get_clientdata(client);
750 int i;
751
752 lp5521_unregister_sysfs(client);
753
754 for (i = 0; i < chip->num_leds; i++) {
755 led_classdev_unregister(&chip->leds[i].cdev);
756 cancel_work_sync(&chip->leds[i].brightness_work);
757 }
758
759 if (chip->pdata->enable)
760 chip->pdata->enable(0);
761 if (chip->pdata->release_resources)
762 chip->pdata->release_resources();
763 kfree(chip);
764 return 0;
765}
766
767static const struct i2c_device_id lp5521_id[] = {
768 { "lp5521", 0 }, /* Three channel chip */
769 { }
770};
771MODULE_DEVICE_TABLE(i2c, lp5521_id);
772
773static struct i2c_driver lp5521_driver = {
774 .driver = {
775 .name = "lp5521",
776 },
777 .probe = lp5521_probe,
778 .remove = __devexit_p(lp5521_remove),
779 .id_table = lp5521_id,
780};
781
782static int __init lp5521_init(void)
783{
784 int ret;
785
786 ret = i2c_add_driver(&lp5521_driver);
787
788 if (ret < 0)
789 printk(KERN_ALERT "Adding lp5521 driver failed\n");
790
791 return ret;
792}
793
794static void __exit lp5521_exit(void)
795{
796 i2c_del_driver(&lp5521_driver);
797}
798
799module_init(lp5521_init);
800module_exit(lp5521_exit);
801
802MODULE_AUTHOR("Mathias Nyman, Yuri Zaporozhets, Samu Onkalo");
803MODULE_DESCRIPTION("LP5521 LED engine");
804MODULE_LICENSE("GPL v2");