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 { |
Samu Onkalo | 0efba16 | 2010-11-11 14:05:22 -0800 | [diff] [blame] | 108 | int id; |
| 109 | u8 mode; |
| 110 | u8 prog_page; |
| 111 | u8 mux_page; |
| 112 | u16 led_mux; |
| 113 | u8 engine_mask; |
| 114 | }; |
| 115 | |
| 116 | struct lp5523_led { |
| 117 | int id; |
| 118 | u8 chan_nr; |
| 119 | u8 led_current; |
| 120 | u8 max_current; |
| 121 | struct led_classdev cdev; |
| 122 | struct work_struct brightness_work; |
| 123 | u8 brightness; |
| 124 | }; |
| 125 | |
| 126 | struct lp5523_chip { |
| 127 | struct mutex lock; /* Serialize control */ |
| 128 | struct i2c_client *client; |
| 129 | struct lp5523_engine engines[LP5523_ENGINES]; |
| 130 | struct lp5523_led leds[LP5523_LEDS]; |
| 131 | struct lp5523_platform_data *pdata; |
| 132 | u8 num_channels; |
| 133 | u8 num_leds; |
| 134 | }; |
| 135 | |
Samu Onkalo | 87dbf62 | 2010-11-24 12:57:03 -0800 | [diff] [blame] | 136 | static inline struct lp5523_led *cdev_to_led(struct led_classdev *cdev) |
| 137 | { |
| 138 | return container_of(cdev, struct lp5523_led, cdev); |
| 139 | } |
Samu Onkalo | 0efba16 | 2010-11-11 14:05:22 -0800 | [diff] [blame] | 140 | |
Samu Onkalo | 87dbf62 | 2010-11-24 12:57:03 -0800 | [diff] [blame] | 141 | static inline struct lp5523_chip *engine_to_lp5523(struct lp5523_engine *engine) |
Samu Onkalo | 0efba16 | 2010-11-11 14:05:22 -0800 | [diff] [blame] | 142 | { |
| 143 | return container_of(engine, struct lp5523_chip, |
| 144 | engines[engine->id - 1]); |
| 145 | } |
| 146 | |
Samu Onkalo | 87dbf62 | 2010-11-24 12:57:03 -0800 | [diff] [blame] | 147 | static inline struct lp5523_chip *led_to_lp5523(struct lp5523_led *led) |
Samu Onkalo | 0efba16 | 2010-11-11 14:05:22 -0800 | [diff] [blame] | 148 | { |
| 149 | return container_of(led, struct lp5523_chip, |
| 150 | leds[led->id]); |
| 151 | } |
| 152 | |
| 153 | static int lp5523_set_mode(struct lp5523_engine *engine, u8 mode); |
| 154 | static int lp5523_set_engine_mode(struct lp5523_engine *engine, u8 mode); |
| 155 | static int lp5523_load_program(struct lp5523_engine *engine, u8 *pattern); |
| 156 | |
| 157 | static void lp5523_led_brightness_work(struct work_struct *work); |
| 158 | |
| 159 | static int lp5523_write(struct i2c_client *client, u8 reg, u8 value) |
| 160 | { |
| 161 | return i2c_smbus_write_byte_data(client, reg, value); |
| 162 | } |
| 163 | |
| 164 | static int lp5523_read(struct i2c_client *client, u8 reg, u8 *buf) |
| 165 | { |
| 166 | s32 ret = i2c_smbus_read_byte_data(client, reg); |
| 167 | |
| 168 | if (ret < 0) |
| 169 | return -EIO; |
| 170 | |
| 171 | *buf = ret; |
| 172 | return 0; |
| 173 | } |
| 174 | |
| 175 | static int lp5523_detect(struct i2c_client *client) |
| 176 | { |
| 177 | int ret; |
| 178 | u8 buf; |
| 179 | |
| 180 | ret = lp5523_write(client, LP5523_REG_ENABLE, 0x40); |
| 181 | if (ret) |
| 182 | return ret; |
| 183 | ret = lp5523_read(client, LP5523_REG_ENABLE, &buf); |
| 184 | if (ret) |
| 185 | return ret; |
| 186 | if (buf == 0x40) |
| 187 | return 0; |
| 188 | else |
| 189 | return -ENODEV; |
| 190 | } |
| 191 | |
| 192 | static int lp5523_configure(struct i2c_client *client) |
| 193 | { |
| 194 | struct lp5523_chip *chip = i2c_get_clientdata(client); |
| 195 | int ret = 0; |
| 196 | u8 status; |
| 197 | |
| 198 | /* one pattern per engine setting led mux start and stop addresses */ |
| 199 | u8 pattern[][LP5523_PROGRAM_LENGTH] = { |
| 200 | { 0x9c, 0x30, 0x9c, 0xb0, 0x9d, 0x80, 0xd8, 0x00, 0}, |
| 201 | { 0x9c, 0x40, 0x9c, 0xc0, 0x9d, 0x80, 0xd8, 0x00, 0}, |
| 202 | { 0x9c, 0x50, 0x9c, 0xd0, 0x9d, 0x80, 0xd8, 0x00, 0}, |
| 203 | }; |
| 204 | |
Samu Onkalo | 0efba16 | 2010-11-11 14:05:22 -0800 | [diff] [blame] | 205 | ret |= lp5523_write(client, LP5523_REG_ENABLE, LP5523_ENABLE); |
Samu Onkalo | 2e4840e | 2010-11-24 12:57:04 -0800 | [diff] [blame] | 206 | /* Chip startup time is 500 us, 1 - 2 ms gives some margin */ |
| 207 | usleep_range(1000, 2000); |
Samu Onkalo | 0efba16 | 2010-11-11 14:05:22 -0800 | [diff] [blame] | 208 | |
| 209 | ret |= lp5523_write(client, LP5523_REG_CONFIG, |
| 210 | LP5523_AUTO_INC | LP5523_PWR_SAVE | |
| 211 | LP5523_CP_AUTO | LP5523_AUTO_CLK | |
| 212 | LP5523_PWM_PWR_SAVE); |
| 213 | |
| 214 | /* turn on all leds */ |
| 215 | ret |= lp5523_write(client, LP5523_REG_ENABLE_LEDS_MSB, 0x01); |
| 216 | ret |= lp5523_write(client, LP5523_REG_ENABLE_LEDS_LSB, 0xff); |
| 217 | |
| 218 | /* hardcode 32 bytes of memory for each engine from program memory */ |
| 219 | ret |= lp5523_write(client, LP5523_REG_CH1_PROG_START, 0x00); |
| 220 | ret |= lp5523_write(client, LP5523_REG_CH2_PROG_START, 0x10); |
| 221 | ret |= lp5523_write(client, LP5523_REG_CH3_PROG_START, 0x20); |
| 222 | |
| 223 | /* write led mux address space for each channel */ |
| 224 | ret |= lp5523_load_program(&chip->engines[0], pattern[0]); |
| 225 | ret |= lp5523_load_program(&chip->engines[1], pattern[1]); |
| 226 | ret |= lp5523_load_program(&chip->engines[2], pattern[2]); |
| 227 | |
| 228 | if (ret) { |
| 229 | dev_err(&client->dev, "could not load mux programs\n"); |
| 230 | return -1; |
| 231 | } |
| 232 | |
| 233 | /* set all engines exec state and mode to run 00101010 */ |
| 234 | ret |= lp5523_write(client, LP5523_REG_ENABLE, |
| 235 | (LP5523_CMD_RUN | LP5523_ENABLE)); |
| 236 | |
| 237 | ret |= lp5523_write(client, LP5523_REG_OP_MODE, LP5523_CMD_RUN); |
| 238 | |
| 239 | if (ret) { |
| 240 | dev_err(&client->dev, "could not start mux programs\n"); |
| 241 | return -1; |
| 242 | } |
| 243 | |
Samu Onkalo | 2e4840e | 2010-11-24 12:57:04 -0800 | [diff] [blame] | 244 | /* Let the programs run for couple of ms and check the engine status */ |
| 245 | usleep_range(3000, 6000); |
Samu Onkalo | 0efba16 | 2010-11-11 14:05:22 -0800 | [diff] [blame] | 246 | lp5523_read(client, LP5523_REG_STATUS, &status); |
| 247 | status &= LP5523_ENG_STATUS_MASK; |
| 248 | |
| 249 | if (status == LP5523_ENG_STATUS_MASK) { |
| 250 | dev_dbg(&client->dev, "all engines configured\n"); |
| 251 | } else { |
| 252 | dev_info(&client->dev, "status == %x\n", status); |
| 253 | dev_err(&client->dev, "cound not configure LED engine\n"); |
| 254 | return -1; |
| 255 | } |
| 256 | |
| 257 | dev_info(&client->dev, "disabling engines\n"); |
| 258 | |
| 259 | ret |= lp5523_write(client, LP5523_REG_OP_MODE, LP5523_CMD_DISABLED); |
| 260 | |
| 261 | return ret; |
| 262 | } |
| 263 | |
| 264 | static int lp5523_set_engine_mode(struct lp5523_engine *engine, u8 mode) |
| 265 | { |
| 266 | struct lp5523_chip *chip = engine_to_lp5523(engine); |
| 267 | struct i2c_client *client = chip->client; |
| 268 | int ret; |
| 269 | u8 engine_state; |
| 270 | |
| 271 | ret = lp5523_read(client, LP5523_REG_OP_MODE, &engine_state); |
| 272 | if (ret) |
| 273 | goto fail; |
| 274 | |
| 275 | engine_state &= ~(engine->engine_mask); |
| 276 | |
| 277 | /* set mode only for this engine */ |
| 278 | mode &= engine->engine_mask; |
| 279 | |
| 280 | engine_state |= mode; |
| 281 | |
| 282 | ret |= lp5523_write(client, LP5523_REG_OP_MODE, engine_state); |
| 283 | fail: |
| 284 | return ret; |
| 285 | } |
| 286 | |
| 287 | static int lp5523_load_mux(struct lp5523_engine *engine, u16 mux) |
| 288 | { |
| 289 | struct lp5523_chip *chip = engine_to_lp5523(engine); |
| 290 | struct i2c_client *client = chip->client; |
| 291 | int ret = 0; |
| 292 | |
| 293 | ret |= lp5523_set_engine_mode(engine, LP5523_CMD_LOAD); |
| 294 | |
| 295 | ret |= lp5523_write(client, LP5523_REG_PROG_PAGE_SEL, engine->mux_page); |
| 296 | ret |= lp5523_write(client, LP5523_REG_PROG_MEM, |
| 297 | (u8)(mux >> 8)); |
| 298 | ret |= lp5523_write(client, LP5523_REG_PROG_MEM + 1, (u8)(mux)); |
| 299 | engine->led_mux = mux; |
| 300 | |
| 301 | return ret; |
| 302 | } |
| 303 | |
| 304 | static int lp5523_load_program(struct lp5523_engine *engine, u8 *pattern) |
| 305 | { |
| 306 | struct lp5523_chip *chip = engine_to_lp5523(engine); |
| 307 | struct i2c_client *client = chip->client; |
| 308 | |
| 309 | int ret = 0; |
| 310 | |
| 311 | ret |= lp5523_set_engine_mode(engine, LP5523_CMD_LOAD); |
| 312 | |
| 313 | ret |= lp5523_write(client, LP5523_REG_PROG_PAGE_SEL, |
| 314 | engine->prog_page); |
| 315 | ret |= i2c_smbus_write_i2c_block_data(client, LP5523_REG_PROG_MEM, |
| 316 | LP5523_PROGRAM_LENGTH, pattern); |
| 317 | |
| 318 | return ret; |
| 319 | } |
| 320 | |
| 321 | static int lp5523_run_program(struct lp5523_engine *engine) |
| 322 | { |
| 323 | struct lp5523_chip *chip = engine_to_lp5523(engine); |
| 324 | struct i2c_client *client = chip->client; |
| 325 | int ret; |
| 326 | |
| 327 | ret = lp5523_write(client, LP5523_REG_ENABLE, |
| 328 | LP5523_CMD_RUN | LP5523_ENABLE); |
| 329 | if (ret) |
| 330 | goto fail; |
| 331 | |
| 332 | ret = lp5523_set_engine_mode(engine, LP5523_CMD_RUN); |
| 333 | fail: |
| 334 | return ret; |
| 335 | } |
| 336 | |
| 337 | static int lp5523_mux_parse(const char *buf, u16 *mux, size_t len) |
| 338 | { |
| 339 | int i; |
| 340 | u16 tmp_mux = 0; |
| 341 | len = len < LP5523_LEDS ? len : LP5523_LEDS; |
| 342 | for (i = 0; i < len; i++) { |
| 343 | switch (buf[i]) { |
| 344 | case '1': |
| 345 | tmp_mux |= (1 << i); |
| 346 | break; |
| 347 | case '0': |
| 348 | break; |
| 349 | case '\n': |
| 350 | i = len; |
| 351 | break; |
| 352 | default: |
| 353 | return -1; |
| 354 | } |
| 355 | } |
| 356 | *mux = tmp_mux; |
| 357 | |
| 358 | return 0; |
| 359 | } |
| 360 | |
| 361 | static void lp5523_mux_to_array(u16 led_mux, char *array) |
| 362 | { |
| 363 | int i, pos = 0; |
| 364 | for (i = 0; i < LP5523_LEDS; i++) |
| 365 | pos += sprintf(array + pos, "%x", LED_ACTIVE(led_mux, i)); |
| 366 | |
| 367 | array[pos] = '\0'; |
| 368 | } |
| 369 | |
| 370 | /*--------------------------------------------------------------*/ |
| 371 | /* Sysfs interface */ |
| 372 | /*--------------------------------------------------------------*/ |
| 373 | |
| 374 | static ssize_t show_engine_leds(struct device *dev, |
| 375 | struct device_attribute *attr, |
| 376 | char *buf, int nr) |
| 377 | { |
| 378 | struct i2c_client *client = to_i2c_client(dev); |
| 379 | struct lp5523_chip *chip = i2c_get_clientdata(client); |
| 380 | char mux[LP5523_LEDS + 1]; |
| 381 | |
| 382 | lp5523_mux_to_array(chip->engines[nr - 1].led_mux, mux); |
| 383 | |
| 384 | return sprintf(buf, "%s\n", mux); |
| 385 | } |
| 386 | |
| 387 | #define show_leds(nr) \ |
| 388 | static ssize_t show_engine##nr##_leds(struct device *dev, \ |
| 389 | struct device_attribute *attr, \ |
| 390 | char *buf) \ |
| 391 | { \ |
| 392 | return show_engine_leds(dev, attr, buf, nr); \ |
| 393 | } |
| 394 | show_leds(1) |
| 395 | show_leds(2) |
| 396 | show_leds(3) |
| 397 | |
| 398 | static ssize_t store_engine_leds(struct device *dev, |
| 399 | struct device_attribute *attr, |
| 400 | const char *buf, size_t len, int nr) |
| 401 | { |
| 402 | struct i2c_client *client = to_i2c_client(dev); |
| 403 | struct lp5523_chip *chip = i2c_get_clientdata(client); |
| 404 | u16 mux = 0; |
Samu Onkalo | fbac081 | 2011-01-12 16:59:18 -0800 | [diff] [blame] | 405 | ssize_t ret; |
Samu Onkalo | 0efba16 | 2010-11-11 14:05:22 -0800 | [diff] [blame] | 406 | |
| 407 | if (lp5523_mux_parse(buf, &mux, len)) |
| 408 | return -EINVAL; |
| 409 | |
Samu Onkalo | fbac081 | 2011-01-12 16:59:18 -0800 | [diff] [blame] | 410 | mutex_lock(&chip->lock); |
| 411 | ret = -EINVAL; |
| 412 | if (chip->engines[nr - 1].mode != LP5523_CMD_LOAD) |
| 413 | goto leave; |
Samu Onkalo | 0efba16 | 2010-11-11 14:05:22 -0800 | [diff] [blame] | 414 | |
Samu Onkalo | fbac081 | 2011-01-12 16:59:18 -0800 | [diff] [blame] | 415 | if (lp5523_load_mux(&chip->engines[nr - 1], mux)) |
| 416 | goto leave; |
| 417 | |
| 418 | ret = len; |
| 419 | leave: |
| 420 | mutex_unlock(&chip->lock); |
| 421 | return ret; |
Samu Onkalo | 0efba16 | 2010-11-11 14:05:22 -0800 | [diff] [blame] | 422 | } |
| 423 | |
| 424 | #define store_leds(nr) \ |
| 425 | static ssize_t store_engine##nr##_leds(struct device *dev, \ |
| 426 | struct device_attribute *attr, \ |
| 427 | const char *buf, size_t len) \ |
| 428 | { \ |
| 429 | return store_engine_leds(dev, attr, buf, len, nr); \ |
| 430 | } |
| 431 | store_leds(1) |
| 432 | store_leds(2) |
| 433 | store_leds(3) |
| 434 | |
| 435 | static ssize_t lp5523_selftest(struct device *dev, |
| 436 | struct device_attribute *attr, |
| 437 | char *buf) |
| 438 | { |
| 439 | struct i2c_client *client = to_i2c_client(dev); |
| 440 | struct lp5523_chip *chip = i2c_get_clientdata(client); |
| 441 | int i, ret, pos = 0; |
| 442 | int led = 0; |
| 443 | u8 status, adc, vdd; |
| 444 | |
| 445 | mutex_lock(&chip->lock); |
| 446 | |
| 447 | ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status); |
| 448 | if (ret < 0) |
| 449 | goto fail; |
| 450 | |
| 451 | /* Check that ext clock is really in use if requested */ |
| 452 | if ((chip->pdata) && (chip->pdata->clock_mode == LP5523_CLOCK_EXT)) |
| 453 | if ((status & LP5523_EXT_CLK_USED) == 0) |
| 454 | goto fail; |
| 455 | |
| 456 | /* Measure VDD (i.e. VBAT) first (channel 16 corresponds to VDD) */ |
| 457 | lp5523_write(chip->client, LP5523_REG_LED_TEST_CTRL, |
| 458 | LP5523_EN_LEDTEST | 16); |
Samu Onkalo | 2e4840e | 2010-11-24 12:57:04 -0800 | [diff] [blame] | 459 | usleep_range(3000, 6000); /* ADC conversion time is typically 2.7 ms */ |
Samu Onkalo | 0efba16 | 2010-11-11 14:05:22 -0800 | [diff] [blame] | 460 | ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status); |
| 461 | if (!(status & LP5523_LEDTEST_DONE)) |
Samu Onkalo | 2e4840e | 2010-11-24 12:57:04 -0800 | [diff] [blame] | 462 | usleep_range(3000, 6000); /* Was not ready. Wait little bit */ |
Samu Onkalo | 0efba16 | 2010-11-11 14:05:22 -0800 | [diff] [blame] | 463 | |
| 464 | ret |= lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &vdd); |
| 465 | vdd--; /* There may be some fluctuation in measurement */ |
| 466 | |
| 467 | for (i = 0; i < LP5523_LEDS; i++) { |
| 468 | /* Skip non-existing channels */ |
| 469 | if (chip->pdata->led_config[i].led_current == 0) |
| 470 | continue; |
| 471 | |
| 472 | /* Set default current */ |
| 473 | lp5523_write(chip->client, |
| 474 | LP5523_REG_LED_CURRENT_BASE + i, |
| 475 | chip->pdata->led_config[i].led_current); |
| 476 | |
| 477 | lp5523_write(chip->client, LP5523_REG_LED_PWM_BASE + i, 0xff); |
Samu Onkalo | 2e4840e | 2010-11-24 12:57:04 -0800 | [diff] [blame] | 478 | /* let current stabilize 2 - 4ms before measurements start */ |
| 479 | usleep_range(2000, 4000); |
Samu Onkalo | 0efba16 | 2010-11-11 14:05:22 -0800 | [diff] [blame] | 480 | lp5523_write(chip->client, |
| 481 | LP5523_REG_LED_TEST_CTRL, |
| 482 | LP5523_EN_LEDTEST | i); |
Samu Onkalo | 2e4840e | 2010-11-24 12:57:04 -0800 | [diff] [blame] | 483 | /* ADC conversion time is 2.7 ms typically */ |
| 484 | usleep_range(3000, 6000); |
Samu Onkalo | 0efba16 | 2010-11-11 14:05:22 -0800 | [diff] [blame] | 485 | ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status); |
| 486 | if (!(status & LP5523_LEDTEST_DONE)) |
Samu Onkalo | 2e4840e | 2010-11-24 12:57:04 -0800 | [diff] [blame] | 487 | usleep_range(3000, 6000);/* Was not ready. Wait. */ |
Samu Onkalo | 0efba16 | 2010-11-11 14:05:22 -0800 | [diff] [blame] | 488 | ret |= lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &adc); |
| 489 | |
| 490 | if (adc >= vdd || adc < LP5523_ADC_SHORTCIRC_LIM) |
| 491 | pos += sprintf(buf + pos, "LED %d FAIL\n", i); |
| 492 | |
| 493 | lp5523_write(chip->client, LP5523_REG_LED_PWM_BASE + i, 0x00); |
| 494 | |
| 495 | /* Restore current */ |
| 496 | lp5523_write(chip->client, |
| 497 | LP5523_REG_LED_CURRENT_BASE + i, |
| 498 | chip->leds[led].led_current); |
| 499 | led++; |
| 500 | } |
| 501 | if (pos == 0) |
| 502 | pos = sprintf(buf, "OK\n"); |
| 503 | goto release_lock; |
| 504 | fail: |
| 505 | pos = sprintf(buf, "FAIL\n"); |
| 506 | |
| 507 | release_lock: |
| 508 | mutex_unlock(&chip->lock); |
| 509 | |
| 510 | return pos; |
| 511 | } |
| 512 | |
| 513 | static void lp5523_set_brightness(struct led_classdev *cdev, |
| 514 | enum led_brightness brightness) |
| 515 | { |
| 516 | struct lp5523_led *led = cdev_to_led(cdev); |
| 517 | |
| 518 | led->brightness = (u8)brightness; |
| 519 | |
| 520 | schedule_work(&led->brightness_work); |
| 521 | } |
| 522 | |
| 523 | static void lp5523_led_brightness_work(struct work_struct *work) |
| 524 | { |
| 525 | struct lp5523_led *led = container_of(work, |
| 526 | struct lp5523_led, |
| 527 | brightness_work); |
| 528 | struct lp5523_chip *chip = led_to_lp5523(led); |
| 529 | struct i2c_client *client = chip->client; |
| 530 | |
| 531 | mutex_lock(&chip->lock); |
| 532 | |
| 533 | lp5523_write(client, LP5523_REG_LED_PWM_BASE + led->chan_nr, |
| 534 | led->brightness); |
| 535 | |
| 536 | mutex_unlock(&chip->lock); |
| 537 | } |
| 538 | |
| 539 | static int lp5523_do_store_load(struct lp5523_engine *engine, |
| 540 | const char *buf, size_t len) |
| 541 | { |
| 542 | struct lp5523_chip *chip = engine_to_lp5523(engine); |
| 543 | struct i2c_client *client = chip->client; |
| 544 | int ret, nrchars, offset = 0, i = 0; |
| 545 | char c[3]; |
| 546 | unsigned cmd; |
| 547 | u8 pattern[LP5523_PROGRAM_LENGTH] = {0}; |
| 548 | |
| 549 | while ((offset < len - 1) && (i < LP5523_PROGRAM_LENGTH)) { |
| 550 | /* separate sscanfs because length is working only for %s */ |
| 551 | ret = sscanf(buf + offset, "%2s%n ", c, &nrchars); |
| 552 | ret = sscanf(c, "%2x", &cmd); |
| 553 | if (ret != 1) |
| 554 | goto fail; |
| 555 | pattern[i] = (u8)cmd; |
| 556 | |
| 557 | offset += nrchars; |
| 558 | i++; |
| 559 | } |
| 560 | |
| 561 | /* Each instruction is 16bit long. Check that length is even */ |
| 562 | if (i % 2) |
| 563 | goto fail; |
| 564 | |
| 565 | mutex_lock(&chip->lock); |
| 566 | |
Samu Onkalo | fbac081 | 2011-01-12 16:59:18 -0800 | [diff] [blame] | 567 | if (engine->mode == LP5523_CMD_LOAD) |
| 568 | ret = lp5523_load_program(engine, pattern); |
| 569 | else |
| 570 | ret = -EINVAL; |
| 571 | |
Samu Onkalo | 0efba16 | 2010-11-11 14:05:22 -0800 | [diff] [blame] | 572 | mutex_unlock(&chip->lock); |
| 573 | |
| 574 | if (ret) { |
| 575 | dev_err(&client->dev, "failed loading pattern\n"); |
| 576 | return ret; |
| 577 | } |
| 578 | |
| 579 | return len; |
| 580 | fail: |
| 581 | dev_err(&client->dev, "wrong pattern format\n"); |
| 582 | return -EINVAL; |
| 583 | } |
| 584 | |
| 585 | static ssize_t store_engine_load(struct device *dev, |
| 586 | struct device_attribute *attr, |
| 587 | const char *buf, size_t len, int nr) |
| 588 | { |
| 589 | struct i2c_client *client = to_i2c_client(dev); |
| 590 | struct lp5523_chip *chip = i2c_get_clientdata(client); |
| 591 | return lp5523_do_store_load(&chip->engines[nr - 1], buf, len); |
| 592 | } |
| 593 | |
| 594 | #define store_load(nr) \ |
| 595 | static ssize_t store_engine##nr##_load(struct device *dev, \ |
| 596 | struct device_attribute *attr, \ |
| 597 | const char *buf, size_t len) \ |
| 598 | { \ |
| 599 | return store_engine_load(dev, attr, buf, len, nr); \ |
| 600 | } |
| 601 | store_load(1) |
| 602 | store_load(2) |
| 603 | store_load(3) |
| 604 | |
| 605 | static ssize_t show_engine_mode(struct device *dev, |
| 606 | struct device_attribute *attr, |
| 607 | char *buf, int nr) |
| 608 | { |
| 609 | struct i2c_client *client = to_i2c_client(dev); |
| 610 | struct lp5523_chip *chip = i2c_get_clientdata(client); |
| 611 | switch (chip->engines[nr - 1].mode) { |
| 612 | case LP5523_CMD_RUN: |
| 613 | return sprintf(buf, "run\n"); |
| 614 | case LP5523_CMD_LOAD: |
| 615 | return sprintf(buf, "load\n"); |
| 616 | case LP5523_CMD_DISABLED: |
| 617 | return sprintf(buf, "disabled\n"); |
| 618 | default: |
| 619 | return sprintf(buf, "disabled\n"); |
| 620 | } |
| 621 | } |
| 622 | |
| 623 | #define show_mode(nr) \ |
| 624 | static ssize_t show_engine##nr##_mode(struct device *dev, \ |
| 625 | struct device_attribute *attr, \ |
| 626 | char *buf) \ |
| 627 | { \ |
| 628 | return show_engine_mode(dev, attr, buf, nr); \ |
| 629 | } |
| 630 | show_mode(1) |
| 631 | show_mode(2) |
| 632 | show_mode(3) |
| 633 | |
| 634 | static ssize_t store_engine_mode(struct device *dev, |
| 635 | struct device_attribute *attr, |
| 636 | const char *buf, size_t len, int nr) |
| 637 | { |
| 638 | struct i2c_client *client = to_i2c_client(dev); |
| 639 | struct lp5523_chip *chip = i2c_get_clientdata(client); |
| 640 | struct lp5523_engine *engine = &chip->engines[nr - 1]; |
| 641 | mutex_lock(&chip->lock); |
| 642 | |
| 643 | if (!strncmp(buf, "run", 3)) |
| 644 | lp5523_set_mode(engine, LP5523_CMD_RUN); |
| 645 | else if (!strncmp(buf, "load", 4)) |
| 646 | lp5523_set_mode(engine, LP5523_CMD_LOAD); |
| 647 | else if (!strncmp(buf, "disabled", 8)) |
| 648 | lp5523_set_mode(engine, LP5523_CMD_DISABLED); |
| 649 | |
| 650 | mutex_unlock(&chip->lock); |
| 651 | return len; |
| 652 | } |
| 653 | |
| 654 | #define store_mode(nr) \ |
| 655 | static ssize_t store_engine##nr##_mode(struct device *dev, \ |
| 656 | struct device_attribute *attr, \ |
| 657 | const char *buf, size_t len) \ |
| 658 | { \ |
| 659 | return store_engine_mode(dev, attr, buf, len, nr); \ |
| 660 | } |
| 661 | store_mode(1) |
| 662 | store_mode(2) |
| 663 | store_mode(3) |
| 664 | |
| 665 | static ssize_t show_max_current(struct device *dev, |
| 666 | struct device_attribute *attr, |
| 667 | char *buf) |
| 668 | { |
| 669 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
| 670 | struct lp5523_led *led = cdev_to_led(led_cdev); |
| 671 | |
| 672 | return sprintf(buf, "%d\n", led->max_current); |
| 673 | } |
| 674 | |
| 675 | static ssize_t show_current(struct device *dev, |
| 676 | struct device_attribute *attr, |
| 677 | char *buf) |
| 678 | { |
| 679 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
| 680 | struct lp5523_led *led = cdev_to_led(led_cdev); |
| 681 | |
| 682 | return sprintf(buf, "%d\n", led->led_current); |
| 683 | } |
| 684 | |
| 685 | static ssize_t store_current(struct device *dev, |
| 686 | struct device_attribute *attr, |
| 687 | const char *buf, size_t len) |
| 688 | { |
| 689 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
| 690 | struct lp5523_led *led = cdev_to_led(led_cdev); |
| 691 | struct lp5523_chip *chip = led_to_lp5523(led); |
| 692 | ssize_t ret; |
| 693 | unsigned long curr; |
| 694 | |
| 695 | if (strict_strtoul(buf, 0, &curr)) |
| 696 | return -EINVAL; |
| 697 | |
| 698 | if (curr > led->max_current) |
| 699 | return -EINVAL; |
| 700 | |
| 701 | mutex_lock(&chip->lock); |
| 702 | ret = lp5523_write(chip->client, |
| 703 | LP5523_REG_LED_CURRENT_BASE + led->chan_nr, |
| 704 | (u8)curr); |
| 705 | mutex_unlock(&chip->lock); |
| 706 | |
| 707 | if (ret < 0) |
| 708 | return ret; |
| 709 | |
| 710 | led->led_current = (u8)curr; |
| 711 | |
| 712 | return len; |
| 713 | } |
| 714 | |
| 715 | /* led class device attributes */ |
Vasiliy Kulikov | ccd7510 | 2011-03-22 16:30:20 -0700 | [diff] [blame] | 716 | static DEVICE_ATTR(led_current, S_IRUGO | S_IWUSR, show_current, store_current); |
Samu Onkalo | 0efba16 | 2010-11-11 14:05:22 -0800 | [diff] [blame] | 717 | static DEVICE_ATTR(max_current, S_IRUGO , show_max_current, NULL); |
| 718 | |
| 719 | static struct attribute *lp5523_led_attributes[] = { |
| 720 | &dev_attr_led_current.attr, |
| 721 | &dev_attr_max_current.attr, |
| 722 | NULL, |
| 723 | }; |
| 724 | |
| 725 | static struct attribute_group lp5523_led_attribute_group = { |
| 726 | .attrs = lp5523_led_attributes |
| 727 | }; |
| 728 | |
| 729 | /* device attributes */ |
Vasiliy Kulikov | ccd7510 | 2011-03-22 16:30:20 -0700 | [diff] [blame] | 730 | static DEVICE_ATTR(engine1_mode, S_IRUGO | S_IWUSR, |
Samu Onkalo | 0efba16 | 2010-11-11 14:05:22 -0800 | [diff] [blame] | 731 | show_engine1_mode, store_engine1_mode); |
Vasiliy Kulikov | ccd7510 | 2011-03-22 16:30:20 -0700 | [diff] [blame] | 732 | static DEVICE_ATTR(engine2_mode, S_IRUGO | S_IWUSR, |
Samu Onkalo | 0efba16 | 2010-11-11 14:05:22 -0800 | [diff] [blame] | 733 | show_engine2_mode, store_engine2_mode); |
Vasiliy Kulikov | ccd7510 | 2011-03-22 16:30:20 -0700 | [diff] [blame] | 734 | static DEVICE_ATTR(engine3_mode, S_IRUGO | S_IWUSR, |
Samu Onkalo | 0efba16 | 2010-11-11 14:05:22 -0800 | [diff] [blame] | 735 | show_engine3_mode, store_engine3_mode); |
Vasiliy Kulikov | ccd7510 | 2011-03-22 16:30:20 -0700 | [diff] [blame] | 736 | static DEVICE_ATTR(engine1_leds, S_IRUGO | S_IWUSR, |
Samu Onkalo | 0efba16 | 2010-11-11 14:05:22 -0800 | [diff] [blame] | 737 | show_engine1_leds, store_engine1_leds); |
Vasiliy Kulikov | ccd7510 | 2011-03-22 16:30:20 -0700 | [diff] [blame] | 738 | static DEVICE_ATTR(engine2_leds, S_IRUGO | S_IWUSR, |
Samu Onkalo | 0efba16 | 2010-11-11 14:05:22 -0800 | [diff] [blame] | 739 | show_engine2_leds, store_engine2_leds); |
Vasiliy Kulikov | ccd7510 | 2011-03-22 16:30:20 -0700 | [diff] [blame] | 740 | static DEVICE_ATTR(engine3_leds, S_IRUGO | S_IWUSR, |
Samu Onkalo | 0efba16 | 2010-11-11 14:05:22 -0800 | [diff] [blame] | 741 | show_engine3_leds, store_engine3_leds); |
Vasiliy Kulikov | ccd7510 | 2011-03-22 16:30:20 -0700 | [diff] [blame] | 742 | static DEVICE_ATTR(engine1_load, S_IWUSR, NULL, store_engine1_load); |
| 743 | static DEVICE_ATTR(engine2_load, S_IWUSR, NULL, store_engine2_load); |
| 744 | static DEVICE_ATTR(engine3_load, S_IWUSR, NULL, store_engine3_load); |
Samu Onkalo | 0efba16 | 2010-11-11 14:05:22 -0800 | [diff] [blame] | 745 | static DEVICE_ATTR(selftest, S_IRUGO, lp5523_selftest, NULL); |
| 746 | |
| 747 | static struct attribute *lp5523_attributes[] = { |
| 748 | &dev_attr_engine1_mode.attr, |
| 749 | &dev_attr_engine2_mode.attr, |
| 750 | &dev_attr_engine3_mode.attr, |
| 751 | &dev_attr_selftest.attr, |
Samu Onkalo | 0efba16 | 2010-11-11 14:05:22 -0800 | [diff] [blame] | 752 | &dev_attr_engine1_load.attr, |
| 753 | &dev_attr_engine1_leds.attr, |
Samu Onkalo | 0efba16 | 2010-11-11 14:05:22 -0800 | [diff] [blame] | 754 | &dev_attr_engine2_load.attr, |
| 755 | &dev_attr_engine2_leds.attr, |
Samu Onkalo | 0efba16 | 2010-11-11 14:05:22 -0800 | [diff] [blame] | 756 | &dev_attr_engine3_load.attr, |
| 757 | &dev_attr_engine3_leds.attr, |
Samu Onkalo | 0efba16 | 2010-11-11 14:05:22 -0800 | [diff] [blame] | 758 | }; |
| 759 | |
| 760 | static const struct attribute_group lp5523_group = { |
| 761 | .attrs = lp5523_attributes, |
| 762 | }; |
| 763 | |
Samu Onkalo | 0efba16 | 2010-11-11 14:05:22 -0800 | [diff] [blame] | 764 | static int lp5523_register_sysfs(struct i2c_client *client) |
| 765 | { |
| 766 | struct device *dev = &client->dev; |
| 767 | int ret; |
| 768 | |
| 769 | ret = sysfs_create_group(&dev->kobj, &lp5523_group); |
| 770 | if (ret < 0) |
| 771 | return ret; |
| 772 | |
| 773 | return 0; |
| 774 | } |
| 775 | |
| 776 | static void lp5523_unregister_sysfs(struct i2c_client *client) |
| 777 | { |
| 778 | struct lp5523_chip *chip = i2c_get_clientdata(client); |
| 779 | struct device *dev = &client->dev; |
| 780 | int i; |
| 781 | |
| 782 | sysfs_remove_group(&dev->kobj, &lp5523_group); |
| 783 | |
Samu Onkalo | 0efba16 | 2010-11-11 14:05:22 -0800 | [diff] [blame] | 784 | for (i = 0; i < chip->num_leds; i++) |
| 785 | sysfs_remove_group(&chip->leds[i].cdev.dev->kobj, |
| 786 | &lp5523_led_attribute_group); |
| 787 | } |
| 788 | |
| 789 | /*--------------------------------------------------------------*/ |
| 790 | /* Set chip operating mode */ |
| 791 | /*--------------------------------------------------------------*/ |
| 792 | static int lp5523_set_mode(struct lp5523_engine *engine, u8 mode) |
| 793 | { |
Samu Onkalo | 0efba16 | 2010-11-11 14:05:22 -0800 | [diff] [blame] | 794 | int ret = 0; |
| 795 | |
| 796 | /* if in that mode already do nothing, except for run */ |
| 797 | if (mode == engine->mode && mode != LP5523_CMD_RUN) |
| 798 | return 0; |
| 799 | |
| 800 | if (mode == LP5523_CMD_RUN) { |
| 801 | ret = lp5523_run_program(engine); |
| 802 | } else if (mode == LP5523_CMD_LOAD) { |
| 803 | lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED); |
| 804 | lp5523_set_engine_mode(engine, LP5523_CMD_LOAD); |
Samu Onkalo | 0efba16 | 2010-11-11 14:05:22 -0800 | [diff] [blame] | 805 | } else if (mode == LP5523_CMD_DISABLED) { |
| 806 | lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED); |
| 807 | } |
| 808 | |
Samu Onkalo | 0efba16 | 2010-11-11 14:05:22 -0800 | [diff] [blame] | 809 | engine->mode = mode; |
| 810 | |
| 811 | return ret; |
| 812 | } |
| 813 | |
| 814 | /*--------------------------------------------------------------*/ |
| 815 | /* Probe, Attach, Remove */ |
| 816 | /*--------------------------------------------------------------*/ |
| 817 | static int __init lp5523_init_engine(struct lp5523_engine *engine, int id) |
| 818 | { |
| 819 | if (id < 1 || id > LP5523_ENGINES) |
| 820 | return -1; |
| 821 | engine->id = id; |
| 822 | engine->engine_mask = LP5523_ENG_MASK_BASE >> SHIFT_MASK(id); |
| 823 | engine->prog_page = id - 1; |
| 824 | engine->mux_page = id + 2; |
Samu Onkalo | 0efba16 | 2010-11-11 14:05:22 -0800 | [diff] [blame] | 825 | |
| 826 | return 0; |
| 827 | } |
| 828 | |
Ralf Baechle | 33721bd | 2011-06-27 16:18:14 -0700 | [diff] [blame^] | 829 | static int __devinit lp5523_init_led(struct lp5523_led *led, struct device *dev, |
Samu Onkalo | 0efba16 | 2010-11-11 14:05:22 -0800 | [diff] [blame] | 830 | int chan, struct lp5523_platform_data *pdata) |
| 831 | { |
| 832 | char name[32]; |
| 833 | int res; |
| 834 | |
| 835 | if (chan >= LP5523_LEDS) |
| 836 | return -EINVAL; |
| 837 | |
| 838 | if (pdata->led_config[chan].led_current) { |
| 839 | led->led_current = pdata->led_config[chan].led_current; |
| 840 | led->max_current = pdata->led_config[chan].max_current; |
| 841 | led->chan_nr = pdata->led_config[chan].chan_nr; |
| 842 | |
| 843 | if (led->chan_nr >= LP5523_LEDS) { |
| 844 | dev_err(dev, "Use channel numbers between 0 and %d\n", |
| 845 | LP5523_LEDS - 1); |
| 846 | return -EINVAL; |
| 847 | } |
| 848 | |
Samu Onkalo | 278ad4f | 2011-01-12 16:59:17 -0800 | [diff] [blame] | 849 | snprintf(name, sizeof(name), "%s:channel%d", |
| 850 | pdata->label ?: "lp5523", chan); |
Samu Onkalo | 0efba16 | 2010-11-11 14:05:22 -0800 | [diff] [blame] | 851 | |
| 852 | led->cdev.name = name; |
| 853 | led->cdev.brightness_set = lp5523_set_brightness; |
| 854 | res = led_classdev_register(dev, &led->cdev); |
| 855 | if (res < 0) { |
| 856 | dev_err(dev, "couldn't register led on channel %d\n", |
| 857 | chan); |
| 858 | return res; |
| 859 | } |
| 860 | res = sysfs_create_group(&led->cdev.dev->kobj, |
| 861 | &lp5523_led_attribute_group); |
| 862 | if (res < 0) { |
| 863 | dev_err(dev, "couldn't register current attribute\n"); |
| 864 | led_classdev_unregister(&led->cdev); |
| 865 | return res; |
| 866 | } |
| 867 | } else { |
| 868 | led->led_current = 0; |
| 869 | } |
| 870 | return 0; |
| 871 | } |
| 872 | |
| 873 | static struct i2c_driver lp5523_driver; |
| 874 | |
Ralf Baechle | 33721bd | 2011-06-27 16:18:14 -0700 | [diff] [blame^] | 875 | static int __devinit lp5523_probe(struct i2c_client *client, |
Samu Onkalo | 0efba16 | 2010-11-11 14:05:22 -0800 | [diff] [blame] | 876 | const struct i2c_device_id *id) |
| 877 | { |
| 878 | struct lp5523_chip *chip; |
| 879 | struct lp5523_platform_data *pdata; |
| 880 | int ret, i, led; |
| 881 | |
| 882 | chip = kzalloc(sizeof(*chip), GFP_KERNEL); |
| 883 | if (!chip) |
| 884 | return -ENOMEM; |
| 885 | |
| 886 | i2c_set_clientdata(client, chip); |
| 887 | chip->client = client; |
| 888 | |
| 889 | pdata = client->dev.platform_data; |
| 890 | |
| 891 | if (!pdata) { |
| 892 | dev_err(&client->dev, "no platform data\n"); |
| 893 | ret = -EINVAL; |
| 894 | goto fail1; |
| 895 | } |
| 896 | |
| 897 | mutex_init(&chip->lock); |
| 898 | |
| 899 | chip->pdata = pdata; |
| 900 | |
| 901 | if (pdata->setup_resources) { |
| 902 | ret = pdata->setup_resources(); |
| 903 | if (ret < 0) |
| 904 | goto fail1; |
| 905 | } |
| 906 | |
| 907 | if (pdata->enable) { |
| 908 | pdata->enable(0); |
Samu Onkalo | 2e4840e | 2010-11-24 12:57:04 -0800 | [diff] [blame] | 909 | usleep_range(1000, 2000); /* Keep enable down at least 1ms */ |
Samu Onkalo | 0efba16 | 2010-11-11 14:05:22 -0800 | [diff] [blame] | 910 | pdata->enable(1); |
Samu Onkalo | 2e4840e | 2010-11-24 12:57:04 -0800 | [diff] [blame] | 911 | usleep_range(1000, 2000); /* 500us abs min. */ |
Samu Onkalo | 0efba16 | 2010-11-11 14:05:22 -0800 | [diff] [blame] | 912 | } |
| 913 | |
Samu Onkalo | 11e7946 | 2010-11-24 12:57:05 -0800 | [diff] [blame] | 914 | lp5523_write(client, LP5523_REG_RESET, 0xff); |
| 915 | usleep_range(10000, 20000); /* |
| 916 | * Exact value is not available. 10 - 20ms |
| 917 | * appears to be enough for reset. |
| 918 | */ |
Samu Onkalo | 0efba16 | 2010-11-11 14:05:22 -0800 | [diff] [blame] | 919 | ret = lp5523_detect(client); |
| 920 | if (ret) |
| 921 | goto fail2; |
| 922 | |
| 923 | dev_info(&client->dev, "LP5523 Programmable led chip found\n"); |
| 924 | |
| 925 | /* Initialize engines */ |
| 926 | for (i = 0; i < ARRAY_SIZE(chip->engines); i++) { |
| 927 | ret = lp5523_init_engine(&chip->engines[i], i + 1); |
| 928 | if (ret) { |
| 929 | dev_err(&client->dev, "error initializing engine\n"); |
| 930 | goto fail2; |
| 931 | } |
| 932 | } |
| 933 | ret = lp5523_configure(client); |
| 934 | if (ret < 0) { |
| 935 | dev_err(&client->dev, "error configuring chip\n"); |
| 936 | goto fail2; |
| 937 | } |
| 938 | |
| 939 | /* Initialize leds */ |
| 940 | chip->num_channels = pdata->num_channels; |
| 941 | chip->num_leds = 0; |
| 942 | led = 0; |
| 943 | for (i = 0; i < pdata->num_channels; i++) { |
| 944 | /* Do not initialize channels that are not connected */ |
| 945 | if (pdata->led_config[i].led_current == 0) |
| 946 | continue; |
| 947 | |
| 948 | ret = lp5523_init_led(&chip->leds[led], &client->dev, i, pdata); |
| 949 | if (ret) { |
| 950 | dev_err(&client->dev, "error initializing leds\n"); |
| 951 | goto fail3; |
| 952 | } |
| 953 | chip->num_leds++; |
| 954 | |
| 955 | chip->leds[led].id = led; |
| 956 | /* Set LED current */ |
| 957 | lp5523_write(client, |
| 958 | LP5523_REG_LED_CURRENT_BASE + chip->leds[led].chan_nr, |
| 959 | chip->leds[led].led_current); |
| 960 | |
| 961 | INIT_WORK(&(chip->leds[led].brightness_work), |
| 962 | lp5523_led_brightness_work); |
| 963 | |
| 964 | led++; |
| 965 | } |
| 966 | |
| 967 | ret = lp5523_register_sysfs(client); |
| 968 | if (ret) { |
| 969 | dev_err(&client->dev, "registering sysfs failed\n"); |
| 970 | goto fail3; |
| 971 | } |
| 972 | return ret; |
| 973 | fail3: |
| 974 | for (i = 0; i < chip->num_leds; i++) { |
| 975 | led_classdev_unregister(&chip->leds[i].cdev); |
| 976 | cancel_work_sync(&chip->leds[i].brightness_work); |
| 977 | } |
| 978 | fail2: |
| 979 | if (pdata->enable) |
| 980 | pdata->enable(0); |
| 981 | if (pdata->release_resources) |
| 982 | pdata->release_resources(); |
| 983 | fail1: |
| 984 | kfree(chip); |
| 985 | return ret; |
| 986 | } |
| 987 | |
| 988 | static int lp5523_remove(struct i2c_client *client) |
| 989 | { |
| 990 | struct lp5523_chip *chip = i2c_get_clientdata(client); |
| 991 | int i; |
| 992 | |
| 993 | lp5523_unregister_sysfs(client); |
| 994 | |
| 995 | for (i = 0; i < chip->num_leds; i++) { |
| 996 | led_classdev_unregister(&chip->leds[i].cdev); |
| 997 | cancel_work_sync(&chip->leds[i].brightness_work); |
| 998 | } |
| 999 | |
| 1000 | if (chip->pdata->enable) |
| 1001 | chip->pdata->enable(0); |
| 1002 | if (chip->pdata->release_resources) |
| 1003 | chip->pdata->release_resources(); |
| 1004 | kfree(chip); |
| 1005 | return 0; |
| 1006 | } |
| 1007 | |
| 1008 | static const struct i2c_device_id lp5523_id[] = { |
| 1009 | { "lp5523", 0 }, |
| 1010 | { } |
| 1011 | }; |
| 1012 | |
| 1013 | MODULE_DEVICE_TABLE(i2c, lp5523_id); |
| 1014 | |
| 1015 | static struct i2c_driver lp5523_driver = { |
| 1016 | .driver = { |
| 1017 | .name = "lp5523", |
| 1018 | }, |
| 1019 | .probe = lp5523_probe, |
| 1020 | .remove = lp5523_remove, |
| 1021 | .id_table = lp5523_id, |
| 1022 | }; |
| 1023 | |
| 1024 | static int __init lp5523_init(void) |
| 1025 | { |
| 1026 | int ret; |
| 1027 | |
| 1028 | ret = i2c_add_driver(&lp5523_driver); |
| 1029 | |
| 1030 | if (ret < 0) |
| 1031 | printk(KERN_ALERT "Adding lp5523 driver failed\n"); |
| 1032 | |
| 1033 | return ret; |
| 1034 | } |
| 1035 | |
| 1036 | static void __exit lp5523_exit(void) |
| 1037 | { |
| 1038 | i2c_del_driver(&lp5523_driver); |
| 1039 | } |
| 1040 | |
| 1041 | module_init(lp5523_init); |
| 1042 | module_exit(lp5523_exit); |
| 1043 | |
| 1044 | MODULE_AUTHOR("Mathias Nyman <mathias.nyman@nokia.com>"); |
| 1045 | MODULE_DESCRIPTION("LP5523 LED engine"); |
| 1046 | MODULE_LICENSE("GPL"); |