Samu Onkalo | 0efba16 | 2010-11-11 14:05:22 -0800 | [diff] [blame] | 1 | /* |
| 2 | * lp5523.c - LP5523 LED 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-lp5523.h> |
| 35 | #include <linux/workqueue.h> |
| 36 | #include <linux/slab.h> |
| 37 | |
| 38 | #define LP5523_REG_ENABLE 0x00 |
| 39 | #define LP5523_REG_OP_MODE 0x01 |
| 40 | #define LP5523_REG_RATIOMETRIC_MSB 0x02 |
| 41 | #define LP5523_REG_RATIOMETRIC_LSB 0x03 |
| 42 | #define LP5523_REG_ENABLE_LEDS_MSB 0x04 |
| 43 | #define LP5523_REG_ENABLE_LEDS_LSB 0x05 |
| 44 | #define LP5523_REG_LED_CNTRL_BASE 0x06 |
| 45 | #define LP5523_REG_LED_PWM_BASE 0x16 |
| 46 | #define LP5523_REG_LED_CURRENT_BASE 0x26 |
| 47 | #define LP5523_REG_CONFIG 0x36 |
| 48 | #define LP5523_REG_CHANNEL1_PC 0x37 |
| 49 | #define LP5523_REG_CHANNEL2_PC 0x38 |
| 50 | #define LP5523_REG_CHANNEL3_PC 0x39 |
| 51 | #define LP5523_REG_STATUS 0x3a |
| 52 | #define LP5523_REG_GPO 0x3b |
| 53 | #define LP5523_REG_VARIABLE 0x3c |
| 54 | #define LP5523_REG_RESET 0x3d |
| 55 | #define LP5523_REG_TEMP_CTRL 0x3e |
| 56 | #define LP5523_REG_TEMP_READ 0x3f |
| 57 | #define LP5523_REG_TEMP_WRITE 0x40 |
| 58 | #define LP5523_REG_LED_TEST_CTRL 0x41 |
| 59 | #define LP5523_REG_LED_TEST_ADC 0x42 |
| 60 | #define LP5523_REG_ENG1_VARIABLE 0x45 |
| 61 | #define LP5523_REG_ENG2_VARIABLE 0x46 |
| 62 | #define LP5523_REG_ENG3_VARIABLE 0x47 |
| 63 | #define LP5523_REG_MASTER_FADER1 0x48 |
| 64 | #define LP5523_REG_MASTER_FADER2 0x49 |
| 65 | #define LP5523_REG_MASTER_FADER3 0x4a |
| 66 | #define LP5523_REG_CH1_PROG_START 0x4c |
| 67 | #define LP5523_REG_CH2_PROG_START 0x4d |
| 68 | #define LP5523_REG_CH3_PROG_START 0x4e |
| 69 | #define LP5523_REG_PROG_PAGE_SEL 0x4f |
| 70 | #define LP5523_REG_PROG_MEM 0x50 |
| 71 | |
| 72 | #define LP5523_CMD_LOAD 0x15 /* 00010101 */ |
| 73 | #define LP5523_CMD_RUN 0x2a /* 00101010 */ |
| 74 | #define LP5523_CMD_DISABLED 0x00 /* 00000000 */ |
| 75 | |
| 76 | #define LP5523_ENABLE 0x40 |
| 77 | #define LP5523_AUTO_INC 0x40 |
| 78 | #define LP5523_PWR_SAVE 0x20 |
| 79 | #define LP5523_PWM_PWR_SAVE 0x04 |
| 80 | #define LP5523_CP_1 0x08 |
| 81 | #define LP5523_CP_1_5 0x10 |
| 82 | #define LP5523_CP_AUTO 0x18 |
| 83 | #define LP5523_INT_CLK 0x01 |
| 84 | #define LP5523_AUTO_CLK 0x02 |
| 85 | #define LP5523_EN_LEDTEST 0x80 |
| 86 | #define LP5523_LEDTEST_DONE 0x80 |
| 87 | |
| 88 | #define LP5523_DEFAULT_CURRENT 50 /* microAmps */ |
| 89 | #define LP5523_PROGRAM_LENGTH 32 /* in bytes */ |
| 90 | #define LP5523_PROGRAM_PAGES 6 |
| 91 | #define LP5523_ADC_SHORTCIRC_LIM 80 |
| 92 | |
| 93 | #define LP5523_LEDS 9 |
| 94 | #define LP5523_ENGINES 3 |
| 95 | |
| 96 | #define LP5523_ENG_MASK_BASE 0x30 /* 00110000 */ |
| 97 | |
| 98 | #define LP5523_ENG_STATUS_MASK 0x07 /* 00000111 */ |
| 99 | |
| 100 | #define LP5523_IRQ_FLAGS IRQF_TRIGGER_FALLING |
| 101 | |
| 102 | #define LP5523_EXT_CLK_USED 0x08 |
| 103 | |
| 104 | #define LED_ACTIVE(mux, led) (!!(mux & (0x0001 << led))) |
| 105 | #define SHIFT_MASK(id) (((id) - 1) * 2) |
| 106 | |
| 107 | struct lp5523_engine { |
| 108 | const struct attribute_group *attributes; |
| 109 | int id; |
| 110 | u8 mode; |
| 111 | u8 prog_page; |
| 112 | u8 mux_page; |
| 113 | u16 led_mux; |
| 114 | u8 engine_mask; |
| 115 | }; |
| 116 | |
| 117 | struct lp5523_led { |
| 118 | int id; |
| 119 | u8 chan_nr; |
| 120 | u8 led_current; |
| 121 | u8 max_current; |
| 122 | struct led_classdev cdev; |
| 123 | struct work_struct brightness_work; |
| 124 | u8 brightness; |
| 125 | }; |
| 126 | |
| 127 | struct lp5523_chip { |
| 128 | struct mutex lock; /* Serialize control */ |
| 129 | struct i2c_client *client; |
| 130 | struct lp5523_engine engines[LP5523_ENGINES]; |
| 131 | struct lp5523_led leds[LP5523_LEDS]; |
| 132 | struct lp5523_platform_data *pdata; |
| 133 | u8 num_channels; |
| 134 | u8 num_leds; |
| 135 | }; |
| 136 | |
Samu Onkalo | 87dbf62 | 2010-11-24 12:57:03 -0800 | [diff] [blame^] | 137 | static inline struct lp5523_led *cdev_to_led(struct led_classdev *cdev) |
| 138 | { |
| 139 | return container_of(cdev, struct lp5523_led, cdev); |
| 140 | } |
Samu Onkalo | 0efba16 | 2010-11-11 14:05:22 -0800 | [diff] [blame] | 141 | |
Samu Onkalo | 87dbf62 | 2010-11-24 12:57:03 -0800 | [diff] [blame^] | 142 | static inline struct lp5523_chip *engine_to_lp5523(struct lp5523_engine *engine) |
Samu Onkalo | 0efba16 | 2010-11-11 14:05:22 -0800 | [diff] [blame] | 143 | { |
| 144 | return container_of(engine, struct lp5523_chip, |
| 145 | engines[engine->id - 1]); |
| 146 | } |
| 147 | |
Samu Onkalo | 87dbf62 | 2010-11-24 12:57:03 -0800 | [diff] [blame^] | 148 | static inline struct lp5523_chip *led_to_lp5523(struct lp5523_led *led) |
Samu Onkalo | 0efba16 | 2010-11-11 14:05:22 -0800 | [diff] [blame] | 149 | { |
| 150 | return container_of(led, struct lp5523_chip, |
| 151 | leds[led->id]); |
| 152 | } |
| 153 | |
| 154 | static int lp5523_set_mode(struct lp5523_engine *engine, u8 mode); |
| 155 | static int lp5523_set_engine_mode(struct lp5523_engine *engine, u8 mode); |
| 156 | static int lp5523_load_program(struct lp5523_engine *engine, u8 *pattern); |
| 157 | |
| 158 | static void lp5523_led_brightness_work(struct work_struct *work); |
| 159 | |
| 160 | static int lp5523_write(struct i2c_client *client, u8 reg, u8 value) |
| 161 | { |
| 162 | return i2c_smbus_write_byte_data(client, reg, value); |
| 163 | } |
| 164 | |
| 165 | static int lp5523_read(struct i2c_client *client, u8 reg, u8 *buf) |
| 166 | { |
| 167 | s32 ret = i2c_smbus_read_byte_data(client, reg); |
| 168 | |
| 169 | if (ret < 0) |
| 170 | return -EIO; |
| 171 | |
| 172 | *buf = ret; |
| 173 | return 0; |
| 174 | } |
| 175 | |
| 176 | static int lp5523_detect(struct i2c_client *client) |
| 177 | { |
| 178 | int ret; |
| 179 | u8 buf; |
| 180 | |
| 181 | ret = lp5523_write(client, LP5523_REG_ENABLE, 0x40); |
| 182 | if (ret) |
| 183 | return ret; |
| 184 | ret = lp5523_read(client, LP5523_REG_ENABLE, &buf); |
| 185 | if (ret) |
| 186 | return ret; |
| 187 | if (buf == 0x40) |
| 188 | return 0; |
| 189 | else |
| 190 | return -ENODEV; |
| 191 | } |
| 192 | |
| 193 | static int lp5523_configure(struct i2c_client *client) |
| 194 | { |
| 195 | struct lp5523_chip *chip = i2c_get_clientdata(client); |
| 196 | int ret = 0; |
| 197 | u8 status; |
| 198 | |
| 199 | /* one pattern per engine setting led mux start and stop addresses */ |
| 200 | u8 pattern[][LP5523_PROGRAM_LENGTH] = { |
| 201 | { 0x9c, 0x30, 0x9c, 0xb0, 0x9d, 0x80, 0xd8, 0x00, 0}, |
| 202 | { 0x9c, 0x40, 0x9c, 0xc0, 0x9d, 0x80, 0xd8, 0x00, 0}, |
| 203 | { 0x9c, 0x50, 0x9c, 0xd0, 0x9d, 0x80, 0xd8, 0x00, 0}, |
| 204 | }; |
| 205 | |
| 206 | lp5523_write(client, LP5523_REG_RESET, 0xff); |
| 207 | |
| 208 | usleep_range(10000, 100000); |
| 209 | |
| 210 | ret |= lp5523_write(client, LP5523_REG_ENABLE, LP5523_ENABLE); |
| 211 | /* Chip startup time after reset is 500 us */ |
| 212 | usleep_range(1000, 10000); |
| 213 | |
| 214 | ret |= lp5523_write(client, LP5523_REG_CONFIG, |
| 215 | LP5523_AUTO_INC | LP5523_PWR_SAVE | |
| 216 | LP5523_CP_AUTO | LP5523_AUTO_CLK | |
| 217 | LP5523_PWM_PWR_SAVE); |
| 218 | |
| 219 | /* turn on all leds */ |
| 220 | ret |= lp5523_write(client, LP5523_REG_ENABLE_LEDS_MSB, 0x01); |
| 221 | ret |= lp5523_write(client, LP5523_REG_ENABLE_LEDS_LSB, 0xff); |
| 222 | |
| 223 | /* hardcode 32 bytes of memory for each engine from program memory */ |
| 224 | ret |= lp5523_write(client, LP5523_REG_CH1_PROG_START, 0x00); |
| 225 | ret |= lp5523_write(client, LP5523_REG_CH2_PROG_START, 0x10); |
| 226 | ret |= lp5523_write(client, LP5523_REG_CH3_PROG_START, 0x20); |
| 227 | |
| 228 | /* write led mux address space for each channel */ |
| 229 | ret |= lp5523_load_program(&chip->engines[0], pattern[0]); |
| 230 | ret |= lp5523_load_program(&chip->engines[1], pattern[1]); |
| 231 | ret |= lp5523_load_program(&chip->engines[2], pattern[2]); |
| 232 | |
| 233 | if (ret) { |
| 234 | dev_err(&client->dev, "could not load mux programs\n"); |
| 235 | return -1; |
| 236 | } |
| 237 | |
| 238 | /* set all engines exec state and mode to run 00101010 */ |
| 239 | ret |= lp5523_write(client, LP5523_REG_ENABLE, |
| 240 | (LP5523_CMD_RUN | LP5523_ENABLE)); |
| 241 | |
| 242 | ret |= lp5523_write(client, LP5523_REG_OP_MODE, LP5523_CMD_RUN); |
| 243 | |
| 244 | if (ret) { |
| 245 | dev_err(&client->dev, "could not start mux programs\n"); |
| 246 | return -1; |
| 247 | } |
| 248 | |
| 249 | /* Wait 3ms and check the engine status */ |
| 250 | usleep_range(3000, 20000); |
| 251 | lp5523_read(client, LP5523_REG_STATUS, &status); |
| 252 | status &= LP5523_ENG_STATUS_MASK; |
| 253 | |
| 254 | if (status == LP5523_ENG_STATUS_MASK) { |
| 255 | dev_dbg(&client->dev, "all engines configured\n"); |
| 256 | } else { |
| 257 | dev_info(&client->dev, "status == %x\n", status); |
| 258 | dev_err(&client->dev, "cound not configure LED engine\n"); |
| 259 | return -1; |
| 260 | } |
| 261 | |
| 262 | dev_info(&client->dev, "disabling engines\n"); |
| 263 | |
| 264 | ret |= lp5523_write(client, LP5523_REG_OP_MODE, LP5523_CMD_DISABLED); |
| 265 | |
| 266 | return ret; |
| 267 | } |
| 268 | |
| 269 | static int lp5523_set_engine_mode(struct lp5523_engine *engine, u8 mode) |
| 270 | { |
| 271 | struct lp5523_chip *chip = engine_to_lp5523(engine); |
| 272 | struct i2c_client *client = chip->client; |
| 273 | int ret; |
| 274 | u8 engine_state; |
| 275 | |
| 276 | ret = lp5523_read(client, LP5523_REG_OP_MODE, &engine_state); |
| 277 | if (ret) |
| 278 | goto fail; |
| 279 | |
| 280 | engine_state &= ~(engine->engine_mask); |
| 281 | |
| 282 | /* set mode only for this engine */ |
| 283 | mode &= engine->engine_mask; |
| 284 | |
| 285 | engine_state |= mode; |
| 286 | |
| 287 | ret |= lp5523_write(client, LP5523_REG_OP_MODE, engine_state); |
| 288 | fail: |
| 289 | return ret; |
| 290 | } |
| 291 | |
| 292 | static int lp5523_load_mux(struct lp5523_engine *engine, u16 mux) |
| 293 | { |
| 294 | struct lp5523_chip *chip = engine_to_lp5523(engine); |
| 295 | struct i2c_client *client = chip->client; |
| 296 | int ret = 0; |
| 297 | |
| 298 | ret |= lp5523_set_engine_mode(engine, LP5523_CMD_LOAD); |
| 299 | |
| 300 | ret |= lp5523_write(client, LP5523_REG_PROG_PAGE_SEL, engine->mux_page); |
| 301 | ret |= lp5523_write(client, LP5523_REG_PROG_MEM, |
| 302 | (u8)(mux >> 8)); |
| 303 | ret |= lp5523_write(client, LP5523_REG_PROG_MEM + 1, (u8)(mux)); |
| 304 | engine->led_mux = mux; |
| 305 | |
| 306 | return ret; |
| 307 | } |
| 308 | |
| 309 | static int lp5523_load_program(struct lp5523_engine *engine, u8 *pattern) |
| 310 | { |
| 311 | struct lp5523_chip *chip = engine_to_lp5523(engine); |
| 312 | struct i2c_client *client = chip->client; |
| 313 | |
| 314 | int ret = 0; |
| 315 | |
| 316 | ret |= lp5523_set_engine_mode(engine, LP5523_CMD_LOAD); |
| 317 | |
| 318 | ret |= lp5523_write(client, LP5523_REG_PROG_PAGE_SEL, |
| 319 | engine->prog_page); |
| 320 | ret |= i2c_smbus_write_i2c_block_data(client, LP5523_REG_PROG_MEM, |
| 321 | LP5523_PROGRAM_LENGTH, pattern); |
| 322 | |
| 323 | return ret; |
| 324 | } |
| 325 | |
| 326 | static int lp5523_run_program(struct lp5523_engine *engine) |
| 327 | { |
| 328 | struct lp5523_chip *chip = engine_to_lp5523(engine); |
| 329 | struct i2c_client *client = chip->client; |
| 330 | int ret; |
| 331 | |
| 332 | ret = lp5523_write(client, LP5523_REG_ENABLE, |
| 333 | LP5523_CMD_RUN | LP5523_ENABLE); |
| 334 | if (ret) |
| 335 | goto fail; |
| 336 | |
| 337 | ret = lp5523_set_engine_mode(engine, LP5523_CMD_RUN); |
| 338 | fail: |
| 339 | return ret; |
| 340 | } |
| 341 | |
| 342 | static int lp5523_mux_parse(const char *buf, u16 *mux, size_t len) |
| 343 | { |
| 344 | int i; |
| 345 | u16 tmp_mux = 0; |
| 346 | len = len < LP5523_LEDS ? len : LP5523_LEDS; |
| 347 | for (i = 0; i < len; i++) { |
| 348 | switch (buf[i]) { |
| 349 | case '1': |
| 350 | tmp_mux |= (1 << i); |
| 351 | break; |
| 352 | case '0': |
| 353 | break; |
| 354 | case '\n': |
| 355 | i = len; |
| 356 | break; |
| 357 | default: |
| 358 | return -1; |
| 359 | } |
| 360 | } |
| 361 | *mux = tmp_mux; |
| 362 | |
| 363 | return 0; |
| 364 | } |
| 365 | |
| 366 | static void lp5523_mux_to_array(u16 led_mux, char *array) |
| 367 | { |
| 368 | int i, pos = 0; |
| 369 | for (i = 0; i < LP5523_LEDS; i++) |
| 370 | pos += sprintf(array + pos, "%x", LED_ACTIVE(led_mux, i)); |
| 371 | |
| 372 | array[pos] = '\0'; |
| 373 | } |
| 374 | |
| 375 | /*--------------------------------------------------------------*/ |
| 376 | /* Sysfs interface */ |
| 377 | /*--------------------------------------------------------------*/ |
| 378 | |
| 379 | static ssize_t show_engine_leds(struct device *dev, |
| 380 | struct device_attribute *attr, |
| 381 | char *buf, int nr) |
| 382 | { |
| 383 | struct i2c_client *client = to_i2c_client(dev); |
| 384 | struct lp5523_chip *chip = i2c_get_clientdata(client); |
| 385 | char mux[LP5523_LEDS + 1]; |
| 386 | |
| 387 | lp5523_mux_to_array(chip->engines[nr - 1].led_mux, mux); |
| 388 | |
| 389 | return sprintf(buf, "%s\n", mux); |
| 390 | } |
| 391 | |
| 392 | #define show_leds(nr) \ |
| 393 | static ssize_t show_engine##nr##_leds(struct device *dev, \ |
| 394 | struct device_attribute *attr, \ |
| 395 | char *buf) \ |
| 396 | { \ |
| 397 | return show_engine_leds(dev, attr, buf, nr); \ |
| 398 | } |
| 399 | show_leds(1) |
| 400 | show_leds(2) |
| 401 | show_leds(3) |
| 402 | |
| 403 | static ssize_t store_engine_leds(struct device *dev, |
| 404 | struct device_attribute *attr, |
| 405 | const char *buf, size_t len, int nr) |
| 406 | { |
| 407 | struct i2c_client *client = to_i2c_client(dev); |
| 408 | struct lp5523_chip *chip = i2c_get_clientdata(client); |
| 409 | u16 mux = 0; |
| 410 | |
| 411 | if (lp5523_mux_parse(buf, &mux, len)) |
| 412 | return -EINVAL; |
| 413 | |
| 414 | if (lp5523_load_mux(&chip->engines[nr - 1], mux)) |
| 415 | return -EINVAL; |
| 416 | |
| 417 | return len; |
| 418 | } |
| 419 | |
| 420 | #define store_leds(nr) \ |
| 421 | static ssize_t store_engine##nr##_leds(struct device *dev, \ |
| 422 | struct device_attribute *attr, \ |
| 423 | const char *buf, size_t len) \ |
| 424 | { \ |
| 425 | return store_engine_leds(dev, attr, buf, len, nr); \ |
| 426 | } |
| 427 | store_leds(1) |
| 428 | store_leds(2) |
| 429 | store_leds(3) |
| 430 | |
| 431 | static ssize_t lp5523_selftest(struct device *dev, |
| 432 | struct device_attribute *attr, |
| 433 | char *buf) |
| 434 | { |
| 435 | struct i2c_client *client = to_i2c_client(dev); |
| 436 | struct lp5523_chip *chip = i2c_get_clientdata(client); |
| 437 | int i, ret, pos = 0; |
| 438 | int led = 0; |
| 439 | u8 status, adc, vdd; |
| 440 | |
| 441 | mutex_lock(&chip->lock); |
| 442 | |
| 443 | ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status); |
| 444 | if (ret < 0) |
| 445 | goto fail; |
| 446 | |
| 447 | /* Check that ext clock is really in use if requested */ |
| 448 | if ((chip->pdata) && (chip->pdata->clock_mode == LP5523_CLOCK_EXT)) |
| 449 | if ((status & LP5523_EXT_CLK_USED) == 0) |
| 450 | goto fail; |
| 451 | |
| 452 | /* Measure VDD (i.e. VBAT) first (channel 16 corresponds to VDD) */ |
| 453 | lp5523_write(chip->client, LP5523_REG_LED_TEST_CTRL, |
| 454 | LP5523_EN_LEDTEST | 16); |
| 455 | usleep_range(3000, 10000); |
| 456 | ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status); |
| 457 | if (!(status & LP5523_LEDTEST_DONE)) |
| 458 | usleep_range(3000, 10000); |
| 459 | |
| 460 | ret |= lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &vdd); |
| 461 | vdd--; /* There may be some fluctuation in measurement */ |
| 462 | |
| 463 | for (i = 0; i < LP5523_LEDS; i++) { |
| 464 | /* Skip non-existing channels */ |
| 465 | if (chip->pdata->led_config[i].led_current == 0) |
| 466 | continue; |
| 467 | |
| 468 | /* Set default current */ |
| 469 | lp5523_write(chip->client, |
| 470 | LP5523_REG_LED_CURRENT_BASE + i, |
| 471 | chip->pdata->led_config[i].led_current); |
| 472 | |
| 473 | lp5523_write(chip->client, LP5523_REG_LED_PWM_BASE + i, 0xff); |
| 474 | /* let current stabilize 2ms before measurements start */ |
| 475 | usleep_range(2000, 10000); |
| 476 | lp5523_write(chip->client, |
| 477 | LP5523_REG_LED_TEST_CTRL, |
| 478 | LP5523_EN_LEDTEST | i); |
| 479 | /* ledtest takes 2.7ms */ |
| 480 | usleep_range(3000, 10000); |
| 481 | ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status); |
| 482 | if (!(status & LP5523_LEDTEST_DONE)) |
| 483 | usleep_range(3000, 10000); |
| 484 | ret |= lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &adc); |
| 485 | |
| 486 | if (adc >= vdd || adc < LP5523_ADC_SHORTCIRC_LIM) |
| 487 | pos += sprintf(buf + pos, "LED %d FAIL\n", i); |
| 488 | |
| 489 | lp5523_write(chip->client, LP5523_REG_LED_PWM_BASE + i, 0x00); |
| 490 | |
| 491 | /* Restore current */ |
| 492 | lp5523_write(chip->client, |
| 493 | LP5523_REG_LED_CURRENT_BASE + i, |
| 494 | chip->leds[led].led_current); |
| 495 | led++; |
| 496 | } |
| 497 | if (pos == 0) |
| 498 | pos = sprintf(buf, "OK\n"); |
| 499 | goto release_lock; |
| 500 | fail: |
| 501 | pos = sprintf(buf, "FAIL\n"); |
| 502 | |
| 503 | release_lock: |
| 504 | mutex_unlock(&chip->lock); |
| 505 | |
| 506 | return pos; |
| 507 | } |
| 508 | |
| 509 | static void lp5523_set_brightness(struct led_classdev *cdev, |
| 510 | enum led_brightness brightness) |
| 511 | { |
| 512 | struct lp5523_led *led = cdev_to_led(cdev); |
| 513 | |
| 514 | led->brightness = (u8)brightness; |
| 515 | |
| 516 | schedule_work(&led->brightness_work); |
| 517 | } |
| 518 | |
| 519 | static void lp5523_led_brightness_work(struct work_struct *work) |
| 520 | { |
| 521 | struct lp5523_led *led = container_of(work, |
| 522 | struct lp5523_led, |
| 523 | brightness_work); |
| 524 | struct lp5523_chip *chip = led_to_lp5523(led); |
| 525 | struct i2c_client *client = chip->client; |
| 526 | |
| 527 | mutex_lock(&chip->lock); |
| 528 | |
| 529 | lp5523_write(client, LP5523_REG_LED_PWM_BASE + led->chan_nr, |
| 530 | led->brightness); |
| 531 | |
| 532 | mutex_unlock(&chip->lock); |
| 533 | } |
| 534 | |
| 535 | static int lp5523_do_store_load(struct lp5523_engine *engine, |
| 536 | const char *buf, size_t len) |
| 537 | { |
| 538 | struct lp5523_chip *chip = engine_to_lp5523(engine); |
| 539 | struct i2c_client *client = chip->client; |
| 540 | int ret, nrchars, offset = 0, i = 0; |
| 541 | char c[3]; |
| 542 | unsigned cmd; |
| 543 | u8 pattern[LP5523_PROGRAM_LENGTH] = {0}; |
| 544 | |
| 545 | while ((offset < len - 1) && (i < LP5523_PROGRAM_LENGTH)) { |
| 546 | /* separate sscanfs because length is working only for %s */ |
| 547 | ret = sscanf(buf + offset, "%2s%n ", c, &nrchars); |
| 548 | ret = sscanf(c, "%2x", &cmd); |
| 549 | if (ret != 1) |
| 550 | goto fail; |
| 551 | pattern[i] = (u8)cmd; |
| 552 | |
| 553 | offset += nrchars; |
| 554 | i++; |
| 555 | } |
| 556 | |
| 557 | /* Each instruction is 16bit long. Check that length is even */ |
| 558 | if (i % 2) |
| 559 | goto fail; |
| 560 | |
| 561 | mutex_lock(&chip->lock); |
| 562 | |
| 563 | ret = lp5523_load_program(engine, pattern); |
| 564 | mutex_unlock(&chip->lock); |
| 565 | |
| 566 | if (ret) { |
| 567 | dev_err(&client->dev, "failed loading pattern\n"); |
| 568 | return ret; |
| 569 | } |
| 570 | |
| 571 | return len; |
| 572 | fail: |
| 573 | dev_err(&client->dev, "wrong pattern format\n"); |
| 574 | return -EINVAL; |
| 575 | } |
| 576 | |
| 577 | static ssize_t store_engine_load(struct device *dev, |
| 578 | struct device_attribute *attr, |
| 579 | const char *buf, size_t len, int nr) |
| 580 | { |
| 581 | struct i2c_client *client = to_i2c_client(dev); |
| 582 | struct lp5523_chip *chip = i2c_get_clientdata(client); |
| 583 | return lp5523_do_store_load(&chip->engines[nr - 1], buf, len); |
| 584 | } |
| 585 | |
| 586 | #define store_load(nr) \ |
| 587 | static ssize_t store_engine##nr##_load(struct device *dev, \ |
| 588 | struct device_attribute *attr, \ |
| 589 | const char *buf, size_t len) \ |
| 590 | { \ |
| 591 | return store_engine_load(dev, attr, buf, len, nr); \ |
| 592 | } |
| 593 | store_load(1) |
| 594 | store_load(2) |
| 595 | store_load(3) |
| 596 | |
| 597 | static ssize_t show_engine_mode(struct device *dev, |
| 598 | struct device_attribute *attr, |
| 599 | char *buf, int nr) |
| 600 | { |
| 601 | struct i2c_client *client = to_i2c_client(dev); |
| 602 | struct lp5523_chip *chip = i2c_get_clientdata(client); |
| 603 | switch (chip->engines[nr - 1].mode) { |
| 604 | case LP5523_CMD_RUN: |
| 605 | return sprintf(buf, "run\n"); |
| 606 | case LP5523_CMD_LOAD: |
| 607 | return sprintf(buf, "load\n"); |
| 608 | case LP5523_CMD_DISABLED: |
| 609 | return sprintf(buf, "disabled\n"); |
| 610 | default: |
| 611 | return sprintf(buf, "disabled\n"); |
| 612 | } |
| 613 | } |
| 614 | |
| 615 | #define show_mode(nr) \ |
| 616 | static ssize_t show_engine##nr##_mode(struct device *dev, \ |
| 617 | struct device_attribute *attr, \ |
| 618 | char *buf) \ |
| 619 | { \ |
| 620 | return show_engine_mode(dev, attr, buf, nr); \ |
| 621 | } |
| 622 | show_mode(1) |
| 623 | show_mode(2) |
| 624 | show_mode(3) |
| 625 | |
| 626 | static ssize_t store_engine_mode(struct device *dev, |
| 627 | struct device_attribute *attr, |
| 628 | const char *buf, size_t len, int nr) |
| 629 | { |
| 630 | struct i2c_client *client = to_i2c_client(dev); |
| 631 | struct lp5523_chip *chip = i2c_get_clientdata(client); |
| 632 | struct lp5523_engine *engine = &chip->engines[nr - 1]; |
| 633 | mutex_lock(&chip->lock); |
| 634 | |
| 635 | if (!strncmp(buf, "run", 3)) |
| 636 | lp5523_set_mode(engine, LP5523_CMD_RUN); |
| 637 | else if (!strncmp(buf, "load", 4)) |
| 638 | lp5523_set_mode(engine, LP5523_CMD_LOAD); |
| 639 | else if (!strncmp(buf, "disabled", 8)) |
| 640 | lp5523_set_mode(engine, LP5523_CMD_DISABLED); |
| 641 | |
| 642 | mutex_unlock(&chip->lock); |
| 643 | return len; |
| 644 | } |
| 645 | |
| 646 | #define store_mode(nr) \ |
| 647 | static ssize_t store_engine##nr##_mode(struct device *dev, \ |
| 648 | struct device_attribute *attr, \ |
| 649 | const char *buf, size_t len) \ |
| 650 | { \ |
| 651 | return store_engine_mode(dev, attr, buf, len, nr); \ |
| 652 | } |
| 653 | store_mode(1) |
| 654 | store_mode(2) |
| 655 | store_mode(3) |
| 656 | |
| 657 | static ssize_t show_max_current(struct device *dev, |
| 658 | struct device_attribute *attr, |
| 659 | char *buf) |
| 660 | { |
| 661 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
| 662 | struct lp5523_led *led = cdev_to_led(led_cdev); |
| 663 | |
| 664 | return sprintf(buf, "%d\n", led->max_current); |
| 665 | } |
| 666 | |
| 667 | static ssize_t show_current(struct device *dev, |
| 668 | struct device_attribute *attr, |
| 669 | char *buf) |
| 670 | { |
| 671 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
| 672 | struct lp5523_led *led = cdev_to_led(led_cdev); |
| 673 | |
| 674 | return sprintf(buf, "%d\n", led->led_current); |
| 675 | } |
| 676 | |
| 677 | static ssize_t store_current(struct device *dev, |
| 678 | struct device_attribute *attr, |
| 679 | const char *buf, size_t len) |
| 680 | { |
| 681 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
| 682 | struct lp5523_led *led = cdev_to_led(led_cdev); |
| 683 | struct lp5523_chip *chip = led_to_lp5523(led); |
| 684 | ssize_t ret; |
| 685 | unsigned long curr; |
| 686 | |
| 687 | if (strict_strtoul(buf, 0, &curr)) |
| 688 | return -EINVAL; |
| 689 | |
| 690 | if (curr > led->max_current) |
| 691 | return -EINVAL; |
| 692 | |
| 693 | mutex_lock(&chip->lock); |
| 694 | ret = lp5523_write(chip->client, |
| 695 | LP5523_REG_LED_CURRENT_BASE + led->chan_nr, |
| 696 | (u8)curr); |
| 697 | mutex_unlock(&chip->lock); |
| 698 | |
| 699 | if (ret < 0) |
| 700 | return ret; |
| 701 | |
| 702 | led->led_current = (u8)curr; |
| 703 | |
| 704 | return len; |
| 705 | } |
| 706 | |
| 707 | /* led class device attributes */ |
| 708 | static DEVICE_ATTR(led_current, S_IRUGO | S_IWUGO, show_current, store_current); |
| 709 | static DEVICE_ATTR(max_current, S_IRUGO , show_max_current, NULL); |
| 710 | |
| 711 | static struct attribute *lp5523_led_attributes[] = { |
| 712 | &dev_attr_led_current.attr, |
| 713 | &dev_attr_max_current.attr, |
| 714 | NULL, |
| 715 | }; |
| 716 | |
| 717 | static struct attribute_group lp5523_led_attribute_group = { |
| 718 | .attrs = lp5523_led_attributes |
| 719 | }; |
| 720 | |
| 721 | /* device attributes */ |
| 722 | static DEVICE_ATTR(engine1_mode, S_IRUGO | S_IWUGO, |
| 723 | show_engine1_mode, store_engine1_mode); |
| 724 | static DEVICE_ATTR(engine2_mode, S_IRUGO | S_IWUGO, |
| 725 | show_engine2_mode, store_engine2_mode); |
| 726 | static DEVICE_ATTR(engine3_mode, S_IRUGO | S_IWUGO, |
| 727 | show_engine3_mode, store_engine3_mode); |
| 728 | static DEVICE_ATTR(engine1_leds, S_IRUGO | S_IWUGO, |
| 729 | show_engine1_leds, store_engine1_leds); |
| 730 | static DEVICE_ATTR(engine2_leds, S_IRUGO | S_IWUGO, |
| 731 | show_engine2_leds, store_engine2_leds); |
| 732 | static DEVICE_ATTR(engine3_leds, S_IRUGO | S_IWUGO, |
| 733 | show_engine3_leds, store_engine3_leds); |
| 734 | static DEVICE_ATTR(engine1_load, S_IWUGO, NULL, store_engine1_load); |
| 735 | static DEVICE_ATTR(engine2_load, S_IWUGO, NULL, store_engine2_load); |
| 736 | static DEVICE_ATTR(engine3_load, S_IWUGO, NULL, store_engine3_load); |
| 737 | static DEVICE_ATTR(selftest, S_IRUGO, lp5523_selftest, NULL); |
| 738 | |
| 739 | static struct attribute *lp5523_attributes[] = { |
| 740 | &dev_attr_engine1_mode.attr, |
| 741 | &dev_attr_engine2_mode.attr, |
| 742 | &dev_attr_engine3_mode.attr, |
| 743 | &dev_attr_selftest.attr, |
| 744 | NULL |
| 745 | }; |
| 746 | |
| 747 | static struct attribute *lp5523_engine1_attributes[] = { |
| 748 | &dev_attr_engine1_load.attr, |
| 749 | &dev_attr_engine1_leds.attr, |
| 750 | NULL |
| 751 | }; |
| 752 | |
| 753 | static struct attribute *lp5523_engine2_attributes[] = { |
| 754 | &dev_attr_engine2_load.attr, |
| 755 | &dev_attr_engine2_leds.attr, |
| 756 | NULL |
| 757 | }; |
| 758 | |
| 759 | static struct attribute *lp5523_engine3_attributes[] = { |
| 760 | &dev_attr_engine3_load.attr, |
| 761 | &dev_attr_engine3_leds.attr, |
| 762 | NULL |
| 763 | }; |
| 764 | |
| 765 | static const struct attribute_group lp5523_group = { |
| 766 | .attrs = lp5523_attributes, |
| 767 | }; |
| 768 | |
| 769 | static const struct attribute_group lp5523_engine_group[] = { |
| 770 | {.attrs = lp5523_engine1_attributes }, |
| 771 | {.attrs = lp5523_engine2_attributes }, |
| 772 | {.attrs = lp5523_engine3_attributes }, |
| 773 | }; |
| 774 | |
| 775 | static int lp5523_register_sysfs(struct i2c_client *client) |
| 776 | { |
| 777 | struct device *dev = &client->dev; |
| 778 | int ret; |
| 779 | |
| 780 | ret = sysfs_create_group(&dev->kobj, &lp5523_group); |
| 781 | if (ret < 0) |
| 782 | return ret; |
| 783 | |
| 784 | return 0; |
| 785 | } |
| 786 | |
| 787 | static void lp5523_unregister_sysfs(struct i2c_client *client) |
| 788 | { |
| 789 | struct lp5523_chip *chip = i2c_get_clientdata(client); |
| 790 | struct device *dev = &client->dev; |
| 791 | int i; |
| 792 | |
| 793 | sysfs_remove_group(&dev->kobj, &lp5523_group); |
| 794 | |
| 795 | for (i = 0; i < ARRAY_SIZE(chip->engines); i++) |
| 796 | if (chip->engines[i].mode == LP5523_CMD_LOAD) |
| 797 | sysfs_remove_group(&dev->kobj, &lp5523_engine_group[i]); |
| 798 | |
| 799 | for (i = 0; i < chip->num_leds; i++) |
| 800 | sysfs_remove_group(&chip->leds[i].cdev.dev->kobj, |
| 801 | &lp5523_led_attribute_group); |
| 802 | } |
| 803 | |
| 804 | /*--------------------------------------------------------------*/ |
| 805 | /* Set chip operating mode */ |
| 806 | /*--------------------------------------------------------------*/ |
| 807 | static int lp5523_set_mode(struct lp5523_engine *engine, u8 mode) |
| 808 | { |
| 809 | /* engine to chip */ |
| 810 | struct lp5523_chip *chip = engine_to_lp5523(engine); |
| 811 | struct i2c_client *client = chip->client; |
| 812 | struct device *dev = &client->dev; |
| 813 | int ret = 0; |
| 814 | |
| 815 | /* if in that mode already do nothing, except for run */ |
| 816 | if (mode == engine->mode && mode != LP5523_CMD_RUN) |
| 817 | return 0; |
| 818 | |
| 819 | if (mode == LP5523_CMD_RUN) { |
| 820 | ret = lp5523_run_program(engine); |
| 821 | } else if (mode == LP5523_CMD_LOAD) { |
| 822 | lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED); |
| 823 | lp5523_set_engine_mode(engine, LP5523_CMD_LOAD); |
| 824 | |
| 825 | ret = sysfs_create_group(&dev->kobj, engine->attributes); |
| 826 | if (ret) |
| 827 | return ret; |
| 828 | } else if (mode == LP5523_CMD_DISABLED) { |
| 829 | lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED); |
| 830 | } |
| 831 | |
| 832 | /* remove load attribute from sysfs if not in load mode */ |
| 833 | if (engine->mode == LP5523_CMD_LOAD && mode != LP5523_CMD_LOAD) |
| 834 | sysfs_remove_group(&dev->kobj, engine->attributes); |
| 835 | |
| 836 | engine->mode = mode; |
| 837 | |
| 838 | return ret; |
| 839 | } |
| 840 | |
| 841 | /*--------------------------------------------------------------*/ |
| 842 | /* Probe, Attach, Remove */ |
| 843 | /*--------------------------------------------------------------*/ |
| 844 | static int __init lp5523_init_engine(struct lp5523_engine *engine, int id) |
| 845 | { |
| 846 | if (id < 1 || id > LP5523_ENGINES) |
| 847 | return -1; |
| 848 | engine->id = id; |
| 849 | engine->engine_mask = LP5523_ENG_MASK_BASE >> SHIFT_MASK(id); |
| 850 | engine->prog_page = id - 1; |
| 851 | engine->mux_page = id + 2; |
| 852 | engine->attributes = &lp5523_engine_group[id - 1]; |
| 853 | |
| 854 | return 0; |
| 855 | } |
| 856 | |
| 857 | static int __init lp5523_init_led(struct lp5523_led *led, struct device *dev, |
| 858 | int chan, struct lp5523_platform_data *pdata) |
| 859 | { |
| 860 | char name[32]; |
| 861 | int res; |
| 862 | |
| 863 | if (chan >= LP5523_LEDS) |
| 864 | return -EINVAL; |
| 865 | |
| 866 | if (pdata->led_config[chan].led_current) { |
| 867 | led->led_current = pdata->led_config[chan].led_current; |
| 868 | led->max_current = pdata->led_config[chan].max_current; |
| 869 | led->chan_nr = pdata->led_config[chan].chan_nr; |
| 870 | |
| 871 | if (led->chan_nr >= LP5523_LEDS) { |
| 872 | dev_err(dev, "Use channel numbers between 0 and %d\n", |
| 873 | LP5523_LEDS - 1); |
| 874 | return -EINVAL; |
| 875 | } |
| 876 | |
| 877 | snprintf(name, 32, "lp5523:channel%d", chan); |
| 878 | |
| 879 | led->cdev.name = name; |
| 880 | led->cdev.brightness_set = lp5523_set_brightness; |
| 881 | res = led_classdev_register(dev, &led->cdev); |
| 882 | if (res < 0) { |
| 883 | dev_err(dev, "couldn't register led on channel %d\n", |
| 884 | chan); |
| 885 | return res; |
| 886 | } |
| 887 | res = sysfs_create_group(&led->cdev.dev->kobj, |
| 888 | &lp5523_led_attribute_group); |
| 889 | if (res < 0) { |
| 890 | dev_err(dev, "couldn't register current attribute\n"); |
| 891 | led_classdev_unregister(&led->cdev); |
| 892 | return res; |
| 893 | } |
| 894 | } else { |
| 895 | led->led_current = 0; |
| 896 | } |
| 897 | return 0; |
| 898 | } |
| 899 | |
| 900 | static struct i2c_driver lp5523_driver; |
| 901 | |
| 902 | static int lp5523_probe(struct i2c_client *client, |
| 903 | const struct i2c_device_id *id) |
| 904 | { |
| 905 | struct lp5523_chip *chip; |
| 906 | struct lp5523_platform_data *pdata; |
| 907 | int ret, i, led; |
| 908 | |
| 909 | chip = kzalloc(sizeof(*chip), GFP_KERNEL); |
| 910 | if (!chip) |
| 911 | return -ENOMEM; |
| 912 | |
| 913 | i2c_set_clientdata(client, chip); |
| 914 | chip->client = client; |
| 915 | |
| 916 | pdata = client->dev.platform_data; |
| 917 | |
| 918 | if (!pdata) { |
| 919 | dev_err(&client->dev, "no platform data\n"); |
| 920 | ret = -EINVAL; |
| 921 | goto fail1; |
| 922 | } |
| 923 | |
| 924 | mutex_init(&chip->lock); |
| 925 | |
| 926 | chip->pdata = pdata; |
| 927 | |
| 928 | if (pdata->setup_resources) { |
| 929 | ret = pdata->setup_resources(); |
| 930 | if (ret < 0) |
| 931 | goto fail1; |
| 932 | } |
| 933 | |
| 934 | if (pdata->enable) { |
| 935 | pdata->enable(0); |
| 936 | usleep_range(1000, 10000); |
| 937 | pdata->enable(1); |
| 938 | usleep_range(1000, 10000); /* Spec says min 500us */ |
| 939 | } |
| 940 | |
| 941 | ret = lp5523_detect(client); |
| 942 | if (ret) |
| 943 | goto fail2; |
| 944 | |
| 945 | dev_info(&client->dev, "LP5523 Programmable led chip found\n"); |
| 946 | |
| 947 | /* Initialize engines */ |
| 948 | for (i = 0; i < ARRAY_SIZE(chip->engines); i++) { |
| 949 | ret = lp5523_init_engine(&chip->engines[i], i + 1); |
| 950 | if (ret) { |
| 951 | dev_err(&client->dev, "error initializing engine\n"); |
| 952 | goto fail2; |
| 953 | } |
| 954 | } |
| 955 | ret = lp5523_configure(client); |
| 956 | if (ret < 0) { |
| 957 | dev_err(&client->dev, "error configuring chip\n"); |
| 958 | goto fail2; |
| 959 | } |
| 960 | |
| 961 | /* Initialize leds */ |
| 962 | chip->num_channels = pdata->num_channels; |
| 963 | chip->num_leds = 0; |
| 964 | led = 0; |
| 965 | for (i = 0; i < pdata->num_channels; i++) { |
| 966 | /* Do not initialize channels that are not connected */ |
| 967 | if (pdata->led_config[i].led_current == 0) |
| 968 | continue; |
| 969 | |
| 970 | ret = lp5523_init_led(&chip->leds[led], &client->dev, i, pdata); |
| 971 | if (ret) { |
| 972 | dev_err(&client->dev, "error initializing leds\n"); |
| 973 | goto fail3; |
| 974 | } |
| 975 | chip->num_leds++; |
| 976 | |
| 977 | chip->leds[led].id = led; |
| 978 | /* Set LED current */ |
| 979 | lp5523_write(client, |
| 980 | LP5523_REG_LED_CURRENT_BASE + chip->leds[led].chan_nr, |
| 981 | chip->leds[led].led_current); |
| 982 | |
| 983 | INIT_WORK(&(chip->leds[led].brightness_work), |
| 984 | lp5523_led_brightness_work); |
| 985 | |
| 986 | led++; |
| 987 | } |
| 988 | |
| 989 | ret = lp5523_register_sysfs(client); |
| 990 | if (ret) { |
| 991 | dev_err(&client->dev, "registering sysfs failed\n"); |
| 992 | goto fail3; |
| 993 | } |
| 994 | return ret; |
| 995 | fail3: |
| 996 | for (i = 0; i < chip->num_leds; i++) { |
| 997 | led_classdev_unregister(&chip->leds[i].cdev); |
| 998 | cancel_work_sync(&chip->leds[i].brightness_work); |
| 999 | } |
| 1000 | fail2: |
| 1001 | if (pdata->enable) |
| 1002 | pdata->enable(0); |
| 1003 | if (pdata->release_resources) |
| 1004 | pdata->release_resources(); |
| 1005 | fail1: |
| 1006 | kfree(chip); |
| 1007 | return ret; |
| 1008 | } |
| 1009 | |
| 1010 | static int lp5523_remove(struct i2c_client *client) |
| 1011 | { |
| 1012 | struct lp5523_chip *chip = i2c_get_clientdata(client); |
| 1013 | int i; |
| 1014 | |
| 1015 | lp5523_unregister_sysfs(client); |
| 1016 | |
| 1017 | for (i = 0; i < chip->num_leds; i++) { |
| 1018 | led_classdev_unregister(&chip->leds[i].cdev); |
| 1019 | cancel_work_sync(&chip->leds[i].brightness_work); |
| 1020 | } |
| 1021 | |
| 1022 | if (chip->pdata->enable) |
| 1023 | chip->pdata->enable(0); |
| 1024 | if (chip->pdata->release_resources) |
| 1025 | chip->pdata->release_resources(); |
| 1026 | kfree(chip); |
| 1027 | return 0; |
| 1028 | } |
| 1029 | |
| 1030 | static const struct i2c_device_id lp5523_id[] = { |
| 1031 | { "lp5523", 0 }, |
| 1032 | { } |
| 1033 | }; |
| 1034 | |
| 1035 | MODULE_DEVICE_TABLE(i2c, lp5523_id); |
| 1036 | |
| 1037 | static struct i2c_driver lp5523_driver = { |
| 1038 | .driver = { |
| 1039 | .name = "lp5523", |
| 1040 | }, |
| 1041 | .probe = lp5523_probe, |
| 1042 | .remove = lp5523_remove, |
| 1043 | .id_table = lp5523_id, |
| 1044 | }; |
| 1045 | |
| 1046 | static int __init lp5523_init(void) |
| 1047 | { |
| 1048 | int ret; |
| 1049 | |
| 1050 | ret = i2c_add_driver(&lp5523_driver); |
| 1051 | |
| 1052 | if (ret < 0) |
| 1053 | printk(KERN_ALERT "Adding lp5523 driver failed\n"); |
| 1054 | |
| 1055 | return ret; |
| 1056 | } |
| 1057 | |
| 1058 | static void __exit lp5523_exit(void) |
| 1059 | { |
| 1060 | i2c_del_driver(&lp5523_driver); |
| 1061 | } |
| 1062 | |
| 1063 | module_init(lp5523_init); |
| 1064 | module_exit(lp5523_exit); |
| 1065 | |
| 1066 | MODULE_AUTHOR("Mathias Nyman <mathias.nyman@nokia.com>"); |
| 1067 | MODULE_DESCRIPTION("LP5523 LED engine"); |
| 1068 | MODULE_LICENSE("GPL"); |