| 1 | // SPDX-License-Identifier: GPL-2.0-only |
| 2 | /* |
| 3 | * Copyright 2007-2008 Extreme Engineering Solutions, Inc. |
| 4 | * |
| 5 | * Author: Nate Case <ncase@xes-inc.com> |
| 6 | * |
| 7 | * LED driver for various PCA955x I2C LED drivers |
| 8 | * |
| 9 | * Supported devices: |
| 10 | * |
| 11 | * Device Description 7-bit slave address |
| 12 | * ------ ----------- ------------------- |
| 13 | * PCA9550 2-bit driver 0x60 .. 0x61 |
| 14 | * PCA9551 8-bit driver 0x60 .. 0x67 |
| 15 | * PCA9552 16-bit driver 0x60 .. 0x67 |
| 16 | * PCA9553/01 4-bit driver 0x62 |
| 17 | * PCA9553/02 4-bit driver 0x63 |
| 18 | * |
| 19 | * Philips PCA955x LED driver chips follow a register map as shown below: |
| 20 | * |
| 21 | * Control Register Description |
| 22 | * ---------------- ----------- |
| 23 | * 0x0 Input register 0 |
| 24 | * .. |
| 25 | * NUM_INPUT_REGS - 1 Last Input register X |
| 26 | * |
| 27 | * NUM_INPUT_REGS Frequency prescaler 0 |
| 28 | * NUM_INPUT_REGS + 1 PWM register 0 |
| 29 | * NUM_INPUT_REGS + 2 Frequency prescaler 1 |
| 30 | * NUM_INPUT_REGS + 3 PWM register 1 |
| 31 | * |
| 32 | * NUM_INPUT_REGS + 4 LED selector 0 |
| 33 | * NUM_INPUT_REGS + 4 |
| 34 | * + NUM_LED_REGS - 1 Last LED selector |
| 35 | * |
| 36 | * where NUM_INPUT_REGS and NUM_LED_REGS vary depending on how many |
| 37 | * bits the chip supports. |
| 38 | */ |
| 39 | |
| 40 | #include <linux/ctype.h> |
| 41 | #include <linux/delay.h> |
| 42 | #include <linux/err.h> |
| 43 | #include <linux/gpio/driver.h> |
| 44 | #include <linux/i2c.h> |
| 45 | #include <linux/leds.h> |
| 46 | #include <linux/module.h> |
| 47 | #include <linux/of.h> |
| 48 | #include <linux/property.h> |
| 49 | #include <linux/slab.h> |
| 50 | #include <linux/string.h> |
| 51 | |
| 52 | #include <dt-bindings/leds/leds-pca955x.h> |
| 53 | |
| 54 | /* LED select registers determine the source that drives LED outputs */ |
| 55 | #define PCA955X_LS_LED_ON 0x0 /* Output LOW */ |
| 56 | #define PCA955X_LS_LED_OFF 0x1 /* Output HI-Z */ |
| 57 | #define PCA955X_LS_BLINK0 0x2 /* Blink at PWM0 rate */ |
| 58 | #define PCA955X_LS_BLINK1 0x3 /* Blink at PWM1 rate */ |
| 59 | |
| 60 | #define PCA955X_GPIO_INPUT LED_OFF |
| 61 | #define PCA955X_GPIO_HIGH LED_OFF |
| 62 | #define PCA955X_GPIO_LOW LED_FULL |
| 63 | |
| 64 | enum pca955x_type { |
| 65 | pca9550, |
| 66 | pca9551, |
| 67 | pca9552, |
| 68 | ibm_pca9552, |
| 69 | pca9553, |
| 70 | }; |
| 71 | |
| 72 | struct pca955x_chipdef { |
| 73 | int bits; |
| 74 | u8 slv_addr; /* 7-bit slave address mask */ |
| 75 | int slv_addr_shift; /* Number of bits to ignore */ |
| 76 | }; |
| 77 | |
| 78 | static struct pca955x_chipdef pca955x_chipdefs[] = { |
| 79 | [pca9550] = { |
| 80 | .bits = 2, |
| 81 | .slv_addr = /* 110000x */ 0x60, |
| 82 | .slv_addr_shift = 1, |
| 83 | }, |
| 84 | [pca9551] = { |
| 85 | .bits = 8, |
| 86 | .slv_addr = /* 1100xxx */ 0x60, |
| 87 | .slv_addr_shift = 3, |
| 88 | }, |
| 89 | [pca9552] = { |
| 90 | .bits = 16, |
| 91 | .slv_addr = /* 1100xxx */ 0x60, |
| 92 | .slv_addr_shift = 3, |
| 93 | }, |
| 94 | [ibm_pca9552] = { |
| 95 | .bits = 16, |
| 96 | .slv_addr = /* 0110xxx */ 0x30, |
| 97 | .slv_addr_shift = 3, |
| 98 | }, |
| 99 | [pca9553] = { |
| 100 | .bits = 4, |
| 101 | .slv_addr = /* 110001x */ 0x62, |
| 102 | .slv_addr_shift = 1, |
| 103 | }, |
| 104 | }; |
| 105 | |
| 106 | static const struct i2c_device_id pca955x_id[] = { |
| 107 | { "pca9550", pca9550 }, |
| 108 | { "pca9551", pca9551 }, |
| 109 | { "pca9552", pca9552 }, |
| 110 | { "ibm-pca9552", ibm_pca9552 }, |
| 111 | { "pca9553", pca9553 }, |
| 112 | { } |
| 113 | }; |
| 114 | MODULE_DEVICE_TABLE(i2c, pca955x_id); |
| 115 | |
| 116 | struct pca955x { |
| 117 | struct mutex lock; |
| 118 | struct pca955x_led *leds; |
| 119 | struct pca955x_chipdef *chipdef; |
| 120 | struct i2c_client *client; |
| 121 | #ifdef CONFIG_LEDS_PCA955X_GPIO |
| 122 | struct gpio_chip gpio; |
| 123 | #endif |
| 124 | }; |
| 125 | |
| 126 | struct pca955x_led { |
| 127 | struct pca955x *pca955x; |
| 128 | struct led_classdev led_cdev; |
| 129 | int led_num; /* 0 .. 15 potentially */ |
| 130 | char name[32]; |
| 131 | u32 type; |
| 132 | const char *default_trigger; |
| 133 | }; |
| 134 | |
| 135 | struct pca955x_platform_data { |
| 136 | struct pca955x_led *leds; |
| 137 | int num_leds; |
| 138 | }; |
| 139 | |
| 140 | /* 8 bits per input register */ |
| 141 | static inline int pca95xx_num_input_regs(int bits) |
| 142 | { |
| 143 | return (bits + 7) / 8; |
| 144 | } |
| 145 | |
| 146 | /* 4 bits per LED selector register */ |
| 147 | static inline int pca95xx_num_led_regs(int bits) |
| 148 | { |
| 149 | return (bits + 3) / 4; |
| 150 | } |
| 151 | |
| 152 | /* |
| 153 | * Return an LED selector register value based on an existing one, with |
| 154 | * the appropriate 2-bit state value set for the given LED number (0-3). |
| 155 | */ |
| 156 | static inline u8 pca955x_ledsel(u8 oldval, int led_num, int state) |
| 157 | { |
| 158 | return (oldval & (~(0x3 << (led_num << 1)))) | |
| 159 | ((state & 0x3) << (led_num << 1)); |
| 160 | } |
| 161 | |
| 162 | /* |
| 163 | * Write to frequency prescaler register, used to program the |
| 164 | * period of the PWM output. period = (PSCx + 1) / 38 |
| 165 | */ |
| 166 | static int pca955x_write_psc(struct i2c_client *client, int n, u8 val) |
| 167 | { |
| 168 | struct pca955x *pca955x = i2c_get_clientdata(client); |
| 169 | u8 cmd = pca95xx_num_input_regs(pca955x->chipdef->bits) + (2 * n); |
| 170 | int ret; |
| 171 | |
| 172 | ret = i2c_smbus_write_byte_data(client, cmd, val); |
| 173 | if (ret < 0) |
| 174 | dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n", |
| 175 | __func__, n, val, ret); |
| 176 | return ret; |
| 177 | } |
| 178 | |
| 179 | /* |
| 180 | * Write to PWM register, which determines the duty cycle of the |
| 181 | * output. LED is OFF when the count is less than the value of this |
| 182 | * register, and ON when it is greater. If PWMx == 0, LED is always OFF. |
| 183 | * |
| 184 | * Duty cycle is (256 - PWMx) / 256 |
| 185 | */ |
| 186 | static int pca955x_write_pwm(struct i2c_client *client, int n, u8 val) |
| 187 | { |
| 188 | struct pca955x *pca955x = i2c_get_clientdata(client); |
| 189 | u8 cmd = pca95xx_num_input_regs(pca955x->chipdef->bits) + 1 + (2 * n); |
| 190 | int ret; |
| 191 | |
| 192 | ret = i2c_smbus_write_byte_data(client, cmd, val); |
| 193 | if (ret < 0) |
| 194 | dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n", |
| 195 | __func__, n, val, ret); |
| 196 | return ret; |
| 197 | } |
| 198 | |
| 199 | /* |
| 200 | * Write to LED selector register, which determines the source that |
| 201 | * drives the LED output. |
| 202 | */ |
| 203 | static int pca955x_write_ls(struct i2c_client *client, int n, u8 val) |
| 204 | { |
| 205 | struct pca955x *pca955x = i2c_get_clientdata(client); |
| 206 | u8 cmd = pca95xx_num_input_regs(pca955x->chipdef->bits) + 4 + n; |
| 207 | int ret; |
| 208 | |
| 209 | ret = i2c_smbus_write_byte_data(client, cmd, val); |
| 210 | if (ret < 0) |
| 211 | dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n", |
| 212 | __func__, n, val, ret); |
| 213 | return ret; |
| 214 | } |
| 215 | |
| 216 | /* |
| 217 | * Read the LED selector register, which determines the source that |
| 218 | * drives the LED output. |
| 219 | */ |
| 220 | static int pca955x_read_ls(struct i2c_client *client, int n, u8 *val) |
| 221 | { |
| 222 | struct pca955x *pca955x = i2c_get_clientdata(client); |
| 223 | u8 cmd = pca95xx_num_input_regs(pca955x->chipdef->bits) + 4 + n; |
| 224 | int ret; |
| 225 | |
| 226 | ret = i2c_smbus_read_byte_data(client, cmd); |
| 227 | if (ret < 0) { |
| 228 | dev_err(&client->dev, "%s: reg 0x%x, err %d\n", |
| 229 | __func__, n, ret); |
| 230 | return ret; |
| 231 | } |
| 232 | *val = (u8)ret; |
| 233 | return 0; |
| 234 | } |
| 235 | |
| 236 | static int pca955x_read_pwm(struct i2c_client *client, int n, u8 *val) |
| 237 | { |
| 238 | struct pca955x *pca955x = i2c_get_clientdata(client); |
| 239 | u8 cmd = pca95xx_num_input_regs(pca955x->chipdef->bits) + 1 + (2 * n); |
| 240 | int ret; |
| 241 | |
| 242 | ret = i2c_smbus_read_byte_data(client, cmd); |
| 243 | if (ret < 0) { |
| 244 | dev_err(&client->dev, "%s: reg 0x%x, err %d\n", |
| 245 | __func__, n, ret); |
| 246 | return ret; |
| 247 | } |
| 248 | *val = (u8)ret; |
| 249 | return 0; |
| 250 | } |
| 251 | |
| 252 | static enum led_brightness pca955x_led_get(struct led_classdev *led_cdev) |
| 253 | { |
| 254 | struct pca955x_led *pca955x_led = container_of(led_cdev, |
| 255 | struct pca955x_led, |
| 256 | led_cdev); |
| 257 | struct pca955x *pca955x = pca955x_led->pca955x; |
| 258 | u8 ls, pwm; |
| 259 | int ret; |
| 260 | |
| 261 | ret = pca955x_read_ls(pca955x->client, pca955x_led->led_num / 4, &ls); |
| 262 | if (ret) |
| 263 | return ret; |
| 264 | |
| 265 | ls = (ls >> ((pca955x_led->led_num % 4) << 1)) & 0x3; |
| 266 | switch (ls) { |
| 267 | case PCA955X_LS_LED_ON: |
| 268 | ret = LED_FULL; |
| 269 | break; |
| 270 | case PCA955X_LS_LED_OFF: |
| 271 | ret = LED_OFF; |
| 272 | break; |
| 273 | case PCA955X_LS_BLINK0: |
| 274 | ret = LED_HALF; |
| 275 | break; |
| 276 | case PCA955X_LS_BLINK1: |
| 277 | ret = pca955x_read_pwm(pca955x->client, 1, &pwm); |
| 278 | if (ret) |
| 279 | return ret; |
| 280 | ret = 255 - pwm; |
| 281 | break; |
| 282 | } |
| 283 | |
| 284 | return ret; |
| 285 | } |
| 286 | |
| 287 | static int pca955x_led_set(struct led_classdev *led_cdev, |
| 288 | enum led_brightness value) |
| 289 | { |
| 290 | struct pca955x_led *pca955x_led; |
| 291 | struct pca955x *pca955x; |
| 292 | u8 ls; |
| 293 | int chip_ls; /* which LSx to use (0-3 potentially) */ |
| 294 | int ls_led; /* which set of bits within LSx to use (0-3) */ |
| 295 | int ret; |
| 296 | |
| 297 | pca955x_led = container_of(led_cdev, struct pca955x_led, led_cdev); |
| 298 | pca955x = pca955x_led->pca955x; |
| 299 | |
| 300 | chip_ls = pca955x_led->led_num / 4; |
| 301 | ls_led = pca955x_led->led_num % 4; |
| 302 | |
| 303 | mutex_lock(&pca955x->lock); |
| 304 | |
| 305 | ret = pca955x_read_ls(pca955x->client, chip_ls, &ls); |
| 306 | if (ret) |
| 307 | goto out; |
| 308 | |
| 309 | switch (value) { |
| 310 | case LED_FULL: |
| 311 | ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_LED_ON); |
| 312 | break; |
| 313 | case LED_OFF: |
| 314 | ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_LED_OFF); |
| 315 | break; |
| 316 | case LED_HALF: |
| 317 | ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_BLINK0); |
| 318 | break; |
| 319 | default: |
| 320 | /* |
| 321 | * Use PWM1 for all other values. This has the unwanted |
| 322 | * side effect of making all LEDs on the chip share the |
| 323 | * same brightness level if set to a value other than |
| 324 | * OFF, HALF, or FULL. But, this is probably better than |
| 325 | * just turning off for all other values. |
| 326 | */ |
| 327 | ret = pca955x_write_pwm(pca955x->client, 1, 255 - value); |
| 328 | if (ret) |
| 329 | goto out; |
| 330 | ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_BLINK1); |
| 331 | break; |
| 332 | } |
| 333 | |
| 334 | ret = pca955x_write_ls(pca955x->client, chip_ls, ls); |
| 335 | |
| 336 | out: |
| 337 | mutex_unlock(&pca955x->lock); |
| 338 | |
| 339 | return ret; |
| 340 | } |
| 341 | |
| 342 | #ifdef CONFIG_LEDS_PCA955X_GPIO |
| 343 | /* |
| 344 | * Read the INPUT register, which contains the state of LEDs. |
| 345 | */ |
| 346 | static int pca955x_read_input(struct i2c_client *client, int n, u8 *val) |
| 347 | { |
| 348 | int ret = i2c_smbus_read_byte_data(client, n); |
| 349 | |
| 350 | if (ret < 0) { |
| 351 | dev_err(&client->dev, "%s: reg 0x%x, err %d\n", |
| 352 | __func__, n, ret); |
| 353 | return ret; |
| 354 | } |
| 355 | *val = (u8)ret; |
| 356 | return 0; |
| 357 | |
| 358 | } |
| 359 | |
| 360 | static int pca955x_gpio_request_pin(struct gpio_chip *gc, unsigned int offset) |
| 361 | { |
| 362 | struct pca955x *pca955x = gpiochip_get_data(gc); |
| 363 | struct pca955x_led *led = &pca955x->leds[offset]; |
| 364 | |
| 365 | if (led->type == PCA955X_TYPE_GPIO) |
| 366 | return 0; |
| 367 | |
| 368 | return -EBUSY; |
| 369 | } |
| 370 | |
| 371 | static int pca955x_set_value(struct gpio_chip *gc, unsigned int offset, |
| 372 | int val) |
| 373 | { |
| 374 | struct pca955x *pca955x = gpiochip_get_data(gc); |
| 375 | struct pca955x_led *led = &pca955x->leds[offset]; |
| 376 | |
| 377 | if (val) |
| 378 | return pca955x_led_set(&led->led_cdev, PCA955X_GPIO_HIGH); |
| 379 | |
| 380 | return pca955x_led_set(&led->led_cdev, PCA955X_GPIO_LOW); |
| 381 | } |
| 382 | |
| 383 | static void pca955x_gpio_set_value(struct gpio_chip *gc, unsigned int offset, |
| 384 | int val) |
| 385 | { |
| 386 | pca955x_set_value(gc, offset, val); |
| 387 | } |
| 388 | |
| 389 | static int pca955x_gpio_get_value(struct gpio_chip *gc, unsigned int offset) |
| 390 | { |
| 391 | struct pca955x *pca955x = gpiochip_get_data(gc); |
| 392 | struct pca955x_led *led = &pca955x->leds[offset]; |
| 393 | u8 reg = 0; |
| 394 | |
| 395 | /* There is nothing we can do about errors */ |
| 396 | pca955x_read_input(pca955x->client, led->led_num / 8, ®); |
| 397 | |
| 398 | return !!(reg & (1 << (led->led_num % 8))); |
| 399 | } |
| 400 | |
| 401 | static int pca955x_gpio_direction_input(struct gpio_chip *gc, |
| 402 | unsigned int offset) |
| 403 | { |
| 404 | struct pca955x *pca955x = gpiochip_get_data(gc); |
| 405 | struct pca955x_led *led = &pca955x->leds[offset]; |
| 406 | |
| 407 | /* To use as input ensure pin is not driven. */ |
| 408 | return pca955x_led_set(&led->led_cdev, PCA955X_GPIO_INPUT); |
| 409 | } |
| 410 | |
| 411 | static int pca955x_gpio_direction_output(struct gpio_chip *gc, |
| 412 | unsigned int offset, int val) |
| 413 | { |
| 414 | return pca955x_set_value(gc, offset, val); |
| 415 | } |
| 416 | #endif /* CONFIG_LEDS_PCA955X_GPIO */ |
| 417 | |
| 418 | static struct pca955x_platform_data * |
| 419 | pca955x_get_pdata(struct i2c_client *client, struct pca955x_chipdef *chip) |
| 420 | { |
| 421 | struct pca955x_platform_data *pdata; |
| 422 | struct pca955x_led *led; |
| 423 | struct fwnode_handle *child; |
| 424 | int count; |
| 425 | |
| 426 | count = device_get_child_node_count(&client->dev); |
| 427 | if (!count || count > chip->bits) |
| 428 | return ERR_PTR(-ENODEV); |
| 429 | |
| 430 | pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL); |
| 431 | if (!pdata) |
| 432 | return ERR_PTR(-ENOMEM); |
| 433 | |
| 434 | pdata->leds = devm_kcalloc(&client->dev, |
| 435 | chip->bits, sizeof(struct pca955x_led), |
| 436 | GFP_KERNEL); |
| 437 | if (!pdata->leds) |
| 438 | return ERR_PTR(-ENOMEM); |
| 439 | |
| 440 | device_for_each_child_node(&client->dev, child) { |
| 441 | const char *name; |
| 442 | u32 reg; |
| 443 | int res; |
| 444 | |
| 445 | res = fwnode_property_read_u32(child, "reg", ®); |
| 446 | if ((res != 0) || (reg >= chip->bits)) |
| 447 | continue; |
| 448 | |
| 449 | res = fwnode_property_read_string(child, "label", &name); |
| 450 | if ((res != 0) && is_of_node(child)) |
| 451 | name = to_of_node(child)->name; |
| 452 | |
| 453 | led = &pdata->leds[reg]; |
| 454 | snprintf(led->name, sizeof(led->name), "%s", name); |
| 455 | |
| 456 | led->type = PCA955X_TYPE_LED; |
| 457 | fwnode_property_read_u32(child, "type", &led->type); |
| 458 | fwnode_property_read_string(child, "linux,default-trigger", |
| 459 | &led->default_trigger); |
| 460 | } |
| 461 | |
| 462 | pdata->num_leds = chip->bits; |
| 463 | |
| 464 | return pdata; |
| 465 | } |
| 466 | |
| 467 | static const struct of_device_id of_pca955x_match[] = { |
| 468 | { .compatible = "nxp,pca9550", .data = (void *)pca9550 }, |
| 469 | { .compatible = "nxp,pca9551", .data = (void *)pca9551 }, |
| 470 | { .compatible = "nxp,pca9552", .data = (void *)pca9552 }, |
| 471 | { .compatible = "ibm,pca9552", .data = (void *)ibm_pca9552 }, |
| 472 | { .compatible = "nxp,pca9553", .data = (void *)pca9553 }, |
| 473 | {}, |
| 474 | }; |
| 475 | MODULE_DEVICE_TABLE(of, of_pca955x_match); |
| 476 | |
| 477 | static int pca955x_probe(struct i2c_client *client, |
| 478 | const struct i2c_device_id *id) |
| 479 | { |
| 480 | struct pca955x *pca955x; |
| 481 | struct pca955x_led *pca955x_led; |
| 482 | struct pca955x_chipdef *chip; |
| 483 | struct led_classdev *led; |
| 484 | struct i2c_adapter *adapter; |
| 485 | int i, err; |
| 486 | struct pca955x_platform_data *pdata; |
| 487 | int ngpios = 0; |
| 488 | |
| 489 | chip = &pca955x_chipdefs[id->driver_data]; |
| 490 | adapter = client->adapter; |
| 491 | pdata = dev_get_platdata(&client->dev); |
| 492 | if (!pdata) { |
| 493 | pdata = pca955x_get_pdata(client, chip); |
| 494 | if (IS_ERR(pdata)) |
| 495 | return PTR_ERR(pdata); |
| 496 | } |
| 497 | |
| 498 | /* Make sure the slave address / chip type combo given is possible */ |
| 499 | if ((client->addr & ~((1 << chip->slv_addr_shift) - 1)) != |
| 500 | chip->slv_addr) { |
| 501 | dev_err(&client->dev, "invalid slave address %02x\n", |
| 502 | client->addr); |
| 503 | return -ENODEV; |
| 504 | } |
| 505 | |
| 506 | dev_info(&client->dev, "leds-pca955x: Using %s %d-bit LED driver at " |
| 507 | "slave address 0x%02x\n", client->name, chip->bits, |
| 508 | client->addr); |
| 509 | |
| 510 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) |
| 511 | return -EIO; |
| 512 | |
| 513 | if (pdata->num_leds != chip->bits) { |
| 514 | dev_err(&client->dev, |
| 515 | "board info claims %d LEDs on a %d-bit chip\n", |
| 516 | pdata->num_leds, chip->bits); |
| 517 | return -ENODEV; |
| 518 | } |
| 519 | |
| 520 | pca955x = devm_kzalloc(&client->dev, sizeof(*pca955x), GFP_KERNEL); |
| 521 | if (!pca955x) |
| 522 | return -ENOMEM; |
| 523 | |
| 524 | pca955x->leds = devm_kcalloc(&client->dev, chip->bits, |
| 525 | sizeof(*pca955x_led), GFP_KERNEL); |
| 526 | if (!pca955x->leds) |
| 527 | return -ENOMEM; |
| 528 | |
| 529 | i2c_set_clientdata(client, pca955x); |
| 530 | |
| 531 | mutex_init(&pca955x->lock); |
| 532 | pca955x->client = client; |
| 533 | pca955x->chipdef = chip; |
| 534 | |
| 535 | for (i = 0; i < chip->bits; i++) { |
| 536 | pca955x_led = &pca955x->leds[i]; |
| 537 | pca955x_led->led_num = i; |
| 538 | pca955x_led->pca955x = pca955x; |
| 539 | pca955x_led->type = pdata->leds[i].type; |
| 540 | |
| 541 | switch (pca955x_led->type) { |
| 542 | case PCA955X_TYPE_NONE: |
| 543 | break; |
| 544 | case PCA955X_TYPE_GPIO: |
| 545 | ngpios++; |
| 546 | break; |
| 547 | case PCA955X_TYPE_LED: |
| 548 | /* |
| 549 | * Platform data can specify LED names and |
| 550 | * default triggers |
| 551 | */ |
| 552 | if (pdata->leds[i].name[0] == '\0') |
| 553 | snprintf(pdata->leds[i].name, |
| 554 | sizeof(pdata->leds[i].name), "%d", i); |
| 555 | |
| 556 | snprintf(pca955x_led->name, sizeof(pca955x_led->name), |
| 557 | "pca955x:%s", pdata->leds[i].name); |
| 558 | |
| 559 | led = &pca955x_led->led_cdev; |
| 560 | if (pdata->leds[i].default_trigger) |
| 561 | led->default_trigger = |
| 562 | pdata->leds[i].default_trigger; |
| 563 | |
| 564 | led->name = pca955x_led->name; |
| 565 | led->brightness_set_blocking = pca955x_led_set; |
| 566 | led->brightness_get = pca955x_led_get; |
| 567 | |
| 568 | err = devm_led_classdev_register(&client->dev, led); |
| 569 | if (err) |
| 570 | return err; |
| 571 | |
| 572 | /* Turn off LED */ |
| 573 | err = pca955x_led_set(led, LED_OFF); |
| 574 | if (err) |
| 575 | return err; |
| 576 | } |
| 577 | } |
| 578 | |
| 579 | /* PWM0 is used for half brightness or 50% duty cycle */ |
| 580 | err = pca955x_write_pwm(client, 0, 255 - LED_HALF); |
| 581 | if (err) |
| 582 | return err; |
| 583 | |
| 584 | /* PWM1 is used for variable brightness, default to OFF */ |
| 585 | err = pca955x_write_pwm(client, 1, 0); |
| 586 | if (err) |
| 587 | return err; |
| 588 | |
| 589 | /* Set to fast frequency so we do not see flashing */ |
| 590 | err = pca955x_write_psc(client, 0, 0); |
| 591 | if (err) |
| 592 | return err; |
| 593 | err = pca955x_write_psc(client, 1, 0); |
| 594 | if (err) |
| 595 | return err; |
| 596 | |
| 597 | #ifdef CONFIG_LEDS_PCA955X_GPIO |
| 598 | if (ngpios) { |
| 599 | pca955x->gpio.label = "gpio-pca955x"; |
| 600 | pca955x->gpio.direction_input = pca955x_gpio_direction_input; |
| 601 | pca955x->gpio.direction_output = pca955x_gpio_direction_output; |
| 602 | pca955x->gpio.set = pca955x_gpio_set_value; |
| 603 | pca955x->gpio.get = pca955x_gpio_get_value; |
| 604 | pca955x->gpio.request = pca955x_gpio_request_pin; |
| 605 | pca955x->gpio.can_sleep = 1; |
| 606 | pca955x->gpio.base = -1; |
| 607 | pca955x->gpio.ngpio = ngpios; |
| 608 | pca955x->gpio.parent = &client->dev; |
| 609 | pca955x->gpio.owner = THIS_MODULE; |
| 610 | |
| 611 | err = devm_gpiochip_add_data(&client->dev, &pca955x->gpio, |
| 612 | pca955x); |
| 613 | if (err) { |
| 614 | /* Use data->gpio.dev as a flag for freeing gpiochip */ |
| 615 | pca955x->gpio.parent = NULL; |
| 616 | dev_warn(&client->dev, "could not add gpiochip\n"); |
| 617 | return err; |
| 618 | } |
| 619 | dev_info(&client->dev, "gpios %i...%i\n", |
| 620 | pca955x->gpio.base, pca955x->gpio.base + |
| 621 | pca955x->gpio.ngpio - 1); |
| 622 | } |
| 623 | #endif |
| 624 | |
| 625 | return 0; |
| 626 | } |
| 627 | |
| 628 | static struct i2c_driver pca955x_driver = { |
| 629 | .driver = { |
| 630 | .name = "leds-pca955x", |
| 631 | .of_match_table = of_pca955x_match, |
| 632 | }, |
| 633 | .probe = pca955x_probe, |
| 634 | .id_table = pca955x_id, |
| 635 | }; |
| 636 | |
| 637 | module_i2c_driver(pca955x_driver); |
| 638 | |
| 639 | MODULE_AUTHOR("Nate Case <ncase@xes-inc.com>"); |
| 640 | MODULE_DESCRIPTION("PCA955x LED driver"); |
| 641 | MODULE_LICENSE("GPL v2"); |