Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 1 | /* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved. |
| 2 | * |
| 3 | * This program is free software; you can redistribute it and/or modify |
| 4 | * it under the terms of the GNU General Public License version 2 and |
| 5 | * only version 2 as published by the Free Software Foundation. |
| 6 | * |
| 7 | * This program is distributed in the hope that it will be useful, |
| 8 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 9 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 10 | * GNU General Public License for more details. |
| 11 | */ |
| 12 | |
Jay Chokshi | 12e49bf | 2011-07-22 16:24:39 -0700 | [diff] [blame^] | 13 | #define pr_fmt(fmt) "%s: " fmt, __func__ |
| 14 | |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 15 | #include <linux/kernel.h> |
| 16 | #include <linux/init.h> |
| 17 | #include <linux/slab.h> |
| 18 | #include <linux/platform_device.h> |
| 19 | #include <linux/leds.h> |
| 20 | #include <linux/workqueue.h> |
| 21 | |
| 22 | #include <linux/mfd/pm8xxx/core.h> |
| 23 | #include <linux/leds-pm8xxx.h> |
| 24 | |
| 25 | #define SSBI_REG_ADDR_DRV_KEYPAD 0x48 |
| 26 | #define PM8XXX_DRV_KEYPAD_BL_MASK 0xf0 |
| 27 | #define PM8XXX_DRV_KEYPAD_BL_SHIFT 0x04 |
| 28 | |
| 29 | #define SSBI_REG_ADDR_FLASH_DRV0 0x49 |
| 30 | #define PM8XXX_DRV_FLASH_MASK 0xf0 |
| 31 | #define PM8XXX_DRV_FLASH_SHIFT 0x04 |
| 32 | |
| 33 | #define SSBI_REG_ADDR_FLASH_DRV1 0xFB |
| 34 | |
| 35 | #define SSBI_REG_ADDR_LED_CTRL_BASE 0x131 |
| 36 | #define SSBI_REG_ADDR_LED_CTRL(n) (SSBI_REG_ADDR_LED_CTRL_BASE + (n)) |
| 37 | #define PM8XXX_DRV_LED_CTRL_MASK 0xf8 |
| 38 | #define PM8XXX_DRV_LED_CTRL_SHIFT 0x03 |
| 39 | |
Jay Chokshi | 12e49bf | 2011-07-22 16:24:39 -0700 | [diff] [blame^] | 40 | #define MAX_FLASH_LED_CURRENT 300 |
| 41 | #define MAX_LC_LED_CURRENT 40 |
| 42 | #define MAX_KP_BL_LED_CURRENT 300 |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 43 | |
Jay Chokshi | 12e49bf | 2011-07-22 16:24:39 -0700 | [diff] [blame^] | 44 | #define PM8XXX_ID_LED_CURRENT_FACTOR 2 /* Iout = x * 2mA */ |
| 45 | #define PM8XXX_ID_FLASH_CURRENT_FACTOR 20 /* Iout = x * 20mA */ |
| 46 | |
| 47 | #define PM8XXX_FLASH_MODE_DBUS1 1 |
| 48 | #define PM8XXX_FLASH_MODE_DBUS2 2 |
| 49 | #define PM8XXX_FLASH_MODE_PWM 3 |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 50 | |
| 51 | #define PM8XXX_LED_OFFSET(id) ((id) - PM8XXX_ID_LED_0) |
| 52 | |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 53 | #define MAX_LC_LED_BRIGHTNESS 20 |
Jay Chokshi | 12e49bf | 2011-07-22 16:24:39 -0700 | [diff] [blame^] | 54 | #define MAX_FLASH_BRIGHTNESS 15 |
| 55 | #define MAX_KB_LED_BRIGHTNESS 15 |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 56 | |
| 57 | /** |
| 58 | * struct pm8xxx_led_data - internal led data structure |
| 59 | * @led_classdev - led class device |
| 60 | * @id - led index |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 61 | * @work - workqueue for led |
| 62 | * @lock - to protect the transactions |
| 63 | * @reg - cached value of led register |
| 64 | */ |
| 65 | struct pm8xxx_led_data { |
| 66 | struct led_classdev cdev; |
| 67 | int id; |
| 68 | u8 reg; |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 69 | struct device *dev; |
| 70 | struct work_struct work; |
| 71 | struct mutex lock; |
| 72 | }; |
| 73 | |
Jay Chokshi | 12e49bf | 2011-07-22 16:24:39 -0700 | [diff] [blame^] | 74 | static struct pm8xxx_led_data *pm8xxx_leds; |
| 75 | |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 76 | static void led_kp_set(struct pm8xxx_led_data *led, enum led_brightness value) |
| 77 | { |
| 78 | int rc; |
| 79 | u8 level; |
| 80 | |
| 81 | level = (value << PM8XXX_DRV_KEYPAD_BL_SHIFT) & |
| 82 | PM8XXX_DRV_KEYPAD_BL_MASK; |
| 83 | |
| 84 | led->reg &= ~PM8XXX_DRV_KEYPAD_BL_MASK; |
| 85 | led->reg |= level; |
| 86 | |
| 87 | rc = pm8xxx_writeb(led->dev->parent, SSBI_REG_ADDR_DRV_KEYPAD, |
| 88 | led->reg); |
| 89 | if (rc < 0) |
| 90 | dev_err(led->cdev.dev, |
| 91 | "can't set keypad backlight level rc=%d\n", rc); |
| 92 | } |
| 93 | |
| 94 | static void led_lc_set(struct pm8xxx_led_data *led, enum led_brightness value) |
| 95 | { |
| 96 | int rc, offset; |
| 97 | u8 level; |
| 98 | |
| 99 | level = (value << PM8XXX_DRV_LED_CTRL_SHIFT) & |
| 100 | PM8XXX_DRV_LED_CTRL_MASK; |
| 101 | |
| 102 | offset = PM8XXX_LED_OFFSET(led->id); |
| 103 | |
| 104 | led->reg &= ~PM8XXX_DRV_LED_CTRL_MASK; |
| 105 | led->reg |= level; |
| 106 | |
| 107 | rc = pm8xxx_writeb(led->dev->parent, SSBI_REG_ADDR_LED_CTRL(offset), |
| 108 | led->reg); |
| 109 | if (rc) |
| 110 | dev_err(led->cdev.dev, "can't set (%d) led value rc=%d\n", |
| 111 | led->id, rc); |
| 112 | } |
| 113 | |
| 114 | static void |
| 115 | led_flash_set(struct pm8xxx_led_data *led, enum led_brightness value) |
| 116 | { |
| 117 | int rc; |
| 118 | u8 level; |
| 119 | u16 reg_addr; |
| 120 | |
| 121 | level = (value << PM8XXX_DRV_FLASH_SHIFT) & |
| 122 | PM8XXX_DRV_FLASH_MASK; |
| 123 | |
| 124 | led->reg &= ~PM8XXX_DRV_FLASH_MASK; |
| 125 | led->reg |= level; |
| 126 | |
| 127 | if (led->id == PM8XXX_ID_FLASH_LED_0) |
| 128 | reg_addr = SSBI_REG_ADDR_FLASH_DRV0; |
| 129 | else |
| 130 | reg_addr = SSBI_REG_ADDR_FLASH_DRV1; |
| 131 | |
| 132 | rc = pm8xxx_writeb(led->dev->parent, reg_addr, led->reg); |
| 133 | if (rc < 0) |
| 134 | dev_err(led->cdev.dev, "can't set flash led%d level rc=%d\n", |
| 135 | led->id, rc); |
| 136 | } |
| 137 | |
| 138 | static void pm8xxx_led_work(struct work_struct *work) |
| 139 | { |
| 140 | struct pm8xxx_led_data *led = container_of(work, |
| 141 | struct pm8xxx_led_data, work); |
Jay Chokshi | 12e49bf | 2011-07-22 16:24:39 -0700 | [diff] [blame^] | 142 | int level = led->cdev.brightness; |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 143 | |
| 144 | mutex_lock(&led->lock); |
| 145 | |
| 146 | switch (led->id) { |
| 147 | case PM8XXX_ID_LED_KB_LIGHT: |
Jay Chokshi | 12e49bf | 2011-07-22 16:24:39 -0700 | [diff] [blame^] | 148 | led_kp_set(led, level); |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 149 | break; |
| 150 | case PM8XXX_ID_LED_0: |
| 151 | case PM8XXX_ID_LED_1: |
| 152 | case PM8XXX_ID_LED_2: |
Jay Chokshi | 12e49bf | 2011-07-22 16:24:39 -0700 | [diff] [blame^] | 153 | led_lc_set(led, level); |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 154 | break; |
| 155 | case PM8XXX_ID_FLASH_LED_0: |
| 156 | case PM8XXX_ID_FLASH_LED_1: |
Jay Chokshi | 12e49bf | 2011-07-22 16:24:39 -0700 | [diff] [blame^] | 157 | led_flash_set(led, level); |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 158 | break; |
| 159 | } |
| 160 | |
| 161 | mutex_unlock(&led->lock); |
| 162 | } |
| 163 | |
| 164 | static void pm8xxx_led_set(struct led_classdev *led_cdev, |
| 165 | enum led_brightness value) |
| 166 | { |
Jay Chokshi | 12e49bf | 2011-07-22 16:24:39 -0700 | [diff] [blame^] | 167 | struct pm8xxx_led_data *led; |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 168 | |
| 169 | led = container_of(led_cdev, struct pm8xxx_led_data, cdev); |
| 170 | |
Jay Chokshi | 12e49bf | 2011-07-22 16:24:39 -0700 | [diff] [blame^] | 171 | if (value < LED_OFF || value > led->cdev.max_brightness) { |
| 172 | dev_err(led->cdev.dev, "Invalid brightness value exceeds"); |
| 173 | return; |
| 174 | } |
| 175 | |
| 176 | led->cdev.brightness = value; |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 177 | schedule_work(&led->work); |
| 178 | } |
| 179 | |
Jay Chokshi | 12e49bf | 2011-07-22 16:24:39 -0700 | [diff] [blame^] | 180 | int pm8xxx_led_config(enum pm8xxx_leds led_id, |
| 181 | enum pm8xxx_led_modes led_mode, int max_current) |
| 182 | { |
| 183 | int rc = 0; |
| 184 | struct pm8xxx_led_data *led = pm8xxx_leds; |
| 185 | |
| 186 | if (led_id < PM8XXX_ID_LED_KB_LIGHT || |
| 187 | led_id > PM8XXX_ID_FLASH_LED_1) { |
| 188 | pr_err("Invalid led no. provided\n"); |
| 189 | return -EINVAL; |
| 190 | } |
| 191 | |
| 192 | if (led_mode < PM8XXX_LED_MODE_MANUAL || |
| 193 | led_mode > PM8XXX_LED_MODE_DTEST4) { |
| 194 | pr_err("Invalid led mode provided\n"); |
| 195 | return -EINVAL; |
| 196 | } |
| 197 | |
| 198 | while (led->id != 0) { |
| 199 | if (led->id == led_id) |
| 200 | break; |
| 201 | led++; |
| 202 | } |
| 203 | |
| 204 | if (led->id == 0) { |
| 205 | pr_err("Could not find LED with the given id"); |
| 206 | return -EINVAL; |
| 207 | } |
| 208 | |
| 209 | mutex_lock(&led->lock); |
| 210 | |
| 211 | switch (led_id) { |
| 212 | case PM8XXX_ID_LED_0: |
| 213 | case PM8XXX_ID_LED_1: |
| 214 | case PM8XXX_ID_LED_2: |
| 215 | led->cdev.max_brightness = max_current / |
| 216 | PM8XXX_ID_LED_CURRENT_FACTOR; |
| 217 | led->reg |= led_mode; |
| 218 | break; |
| 219 | case PM8XXX_ID_LED_KB_LIGHT: |
| 220 | case PM8XXX_ID_FLASH_LED_0: |
| 221 | case PM8XXX_ID_FLASH_LED_1: |
| 222 | led->cdev.max_brightness = max_current / |
| 223 | PM8XXX_ID_FLASH_CURRENT_FACTOR; |
| 224 | switch (led_mode) { |
| 225 | case PM8XXX_LED_MODE_PWM1: |
| 226 | case PM8XXX_LED_MODE_PWM2: |
| 227 | case PM8XXX_LED_MODE_PWM3: |
| 228 | led->reg |= |
| 229 | PM8XXX_FLASH_MODE_PWM; |
| 230 | break; |
| 231 | case PM8XXX_LED_MODE_DTEST1: |
| 232 | led->reg |= |
| 233 | PM8XXX_FLASH_MODE_DBUS1; |
| 234 | break; |
| 235 | case PM8XXX_LED_MODE_DTEST2: |
| 236 | led->reg |= |
| 237 | PM8XXX_FLASH_MODE_DBUS2; |
| 238 | break; |
| 239 | default: |
| 240 | led->reg |= |
| 241 | PM8XXX_LED_MODE_MANUAL; |
| 242 | break; |
| 243 | } |
| 244 | break; |
| 245 | default: |
| 246 | rc = -EINVAL; |
| 247 | pr_err("LED Id is invalid"); |
| 248 | break; |
| 249 | } |
| 250 | |
| 251 | mutex_unlock(&led->lock); |
| 252 | |
| 253 | if (!rc) |
| 254 | pm8xxx_led_set(&led->cdev, led->cdev.max_brightness); |
| 255 | |
| 256 | return rc; |
| 257 | } |
| 258 | EXPORT_SYMBOL(pm8xxx_led_config); |
| 259 | |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 260 | static enum led_brightness pm8xxx_led_get(struct led_classdev *led_cdev) |
| 261 | { |
| 262 | struct pm8xxx_led_data *led; |
| 263 | |
| 264 | led = container_of(led_cdev, struct pm8xxx_led_data, cdev); |
| 265 | |
Jay Chokshi | 12e49bf | 2011-07-22 16:24:39 -0700 | [diff] [blame^] | 266 | return led->cdev.brightness; |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 267 | } |
| 268 | |
| 269 | static int __devinit get_max_brightness(enum pm8xxx_leds id) |
| 270 | { |
| 271 | switch (id) { |
| 272 | case PM8XXX_ID_LED_KB_LIGHT: |
| 273 | return MAX_KB_LED_BRIGHTNESS; |
| 274 | case PM8XXX_ID_LED_0: |
| 275 | case PM8XXX_ID_LED_1: |
| 276 | case PM8XXX_ID_LED_2: |
| 277 | return MAX_LC_LED_BRIGHTNESS; |
| 278 | case PM8XXX_ID_FLASH_LED_0: |
| 279 | case PM8XXX_ID_FLASH_LED_1: |
Jay Chokshi | 12e49bf | 2011-07-22 16:24:39 -0700 | [diff] [blame^] | 280 | return MAX_FLASH_BRIGHTNESS; |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 281 | default: |
| 282 | return 0; |
| 283 | } |
| 284 | } |
| 285 | |
| 286 | static int __devinit get_init_value(struct pm8xxx_led_data *led, u8 *val) |
| 287 | { |
| 288 | int rc, offset; |
| 289 | u16 addr; |
| 290 | |
| 291 | switch (led->id) { |
| 292 | case PM8XXX_ID_LED_KB_LIGHT: |
| 293 | addr = SSBI_REG_ADDR_DRV_KEYPAD; |
| 294 | break; |
| 295 | case PM8XXX_ID_LED_0: |
| 296 | case PM8XXX_ID_LED_1: |
| 297 | case PM8XXX_ID_LED_2: |
| 298 | offset = PM8XXX_LED_OFFSET(led->id); |
| 299 | addr = SSBI_REG_ADDR_LED_CTRL(offset); |
| 300 | break; |
| 301 | case PM8XXX_ID_FLASH_LED_0: |
| 302 | addr = SSBI_REG_ADDR_FLASH_DRV0; |
| 303 | break; |
| 304 | case PM8XXX_ID_FLASH_LED_1: |
| 305 | addr = SSBI_REG_ADDR_FLASH_DRV1; |
| 306 | break; |
| 307 | } |
| 308 | |
| 309 | rc = pm8xxx_readb(led->dev->parent, addr, val); |
| 310 | if (rc) |
| 311 | dev_err(led->cdev.dev, "can't get led(%d) level rc=%d\n", |
| 312 | led->id, rc); |
| 313 | |
| 314 | return rc; |
| 315 | } |
| 316 | |
| 317 | static int __devinit pm8xxx_led_probe(struct platform_device *pdev) |
| 318 | { |
| 319 | const struct led_platform_data *pdata = pdev->dev.platform_data; |
| 320 | struct led_info *curr_led; |
| 321 | struct pm8xxx_led_data *led, *led_dat; |
| 322 | int rc, i; |
| 323 | |
| 324 | if (pdata == NULL) { |
| 325 | dev_err(&pdev->dev, "platform data not supplied\n"); |
| 326 | return -EINVAL; |
| 327 | } |
| 328 | |
Jay Chokshi | 12e49bf | 2011-07-22 16:24:39 -0700 | [diff] [blame^] | 329 | /* Let the last member of the list be zero to |
| 330 | * mark the end of the list. |
| 331 | */ |
| 332 | led = kcalloc(pdata->num_leds + 1, sizeof(*led), GFP_KERNEL); |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 333 | if (led == NULL) { |
| 334 | dev_err(&pdev->dev, "failed to alloc memory\n"); |
| 335 | return -ENOMEM; |
| 336 | } |
| 337 | |
| 338 | for (i = 0; i < pdata->num_leds; i++) { |
| 339 | curr_led = &pdata->leds[i]; |
| 340 | led_dat = &led[i]; |
| 341 | /* the flags variable is used for led-id */ |
| 342 | led_dat->id = curr_led->flags; |
| 343 | |
| 344 | if (!((led_dat->id >= PM8XXX_ID_LED_KB_LIGHT) && |
| 345 | (led_dat->id <= PM8XXX_ID_FLASH_LED_1))) { |
| 346 | dev_err(&pdev->dev, "invalid LED ID (%d) specified\n", |
| 347 | led_dat->id); |
| 348 | rc = -EINVAL; |
| 349 | goto fail_id_check; |
| 350 | } |
| 351 | |
| 352 | led_dat->cdev.name = curr_led->name; |
| 353 | led_dat->cdev.default_trigger = curr_led->default_trigger; |
| 354 | led_dat->cdev.brightness_set = pm8xxx_led_set; |
| 355 | led_dat->cdev.brightness_get = pm8xxx_led_get; |
| 356 | led_dat->cdev.brightness = LED_OFF; |
| 357 | led_dat->cdev.flags = LED_CORE_SUSPENDRESUME; |
Jay Chokshi | 12e49bf | 2011-07-22 16:24:39 -0700 | [diff] [blame^] | 358 | led_dat->cdev.max_brightness = |
| 359 | get_max_brightness(led_dat->id); |
| 360 | led_dat->dev = &pdev->dev; |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 361 | |
| 362 | rc = get_init_value(led_dat, &led_dat->reg); |
| 363 | if (rc < 0) |
| 364 | goto fail_id_check; |
| 365 | |
| 366 | mutex_init(&led_dat->lock); |
| 367 | INIT_WORK(&led_dat->work, pm8xxx_led_work); |
| 368 | |
| 369 | rc = led_classdev_register(&pdev->dev, &led_dat->cdev); |
| 370 | if (rc) { |
| 371 | dev_err(&pdev->dev, "unable to register led %d,rc=%d\n", |
| 372 | led_dat->id, rc); |
| 373 | goto fail_id_check; |
| 374 | } |
| 375 | } |
| 376 | |
Jay Chokshi | 12e49bf | 2011-07-22 16:24:39 -0700 | [diff] [blame^] | 377 | pm8xxx_leds = led; |
| 378 | |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 379 | platform_set_drvdata(pdev, led); |
| 380 | |
| 381 | return 0; |
| 382 | |
| 383 | fail_id_check: |
| 384 | if (i > 0) { |
| 385 | for (i = i - 1; i >= 0; i--) { |
| 386 | mutex_destroy(&led[i].lock); |
| 387 | led_classdev_unregister(&led[i].cdev); |
| 388 | } |
| 389 | } |
| 390 | kfree(led); |
| 391 | return rc; |
| 392 | } |
| 393 | |
| 394 | static int __devexit pm8xxx_led_remove(struct platform_device *pdev) |
| 395 | { |
| 396 | int i; |
| 397 | const struct led_platform_data *pdata = |
| 398 | pdev->dev.platform_data; |
| 399 | struct pm8xxx_led_data *led = platform_get_drvdata(pdev); |
| 400 | |
| 401 | for (i = 0; i < pdata->num_leds; i++) { |
| 402 | cancel_work_sync(&led[i].work); |
| 403 | mutex_destroy(&led[i].lock); |
| 404 | led_classdev_unregister(&led[i].cdev); |
| 405 | } |
| 406 | |
| 407 | kfree(led); |
| 408 | |
| 409 | return 0; |
| 410 | } |
| 411 | |
| 412 | static struct platform_driver pm8xxx_led_driver = { |
| 413 | .probe = pm8xxx_led_probe, |
| 414 | .remove = __devexit_p(pm8xxx_led_remove), |
| 415 | .driver = { |
| 416 | .name = PM8XXX_LEDS_DEV_NAME, |
| 417 | .owner = THIS_MODULE, |
| 418 | }, |
| 419 | }; |
| 420 | |
| 421 | static int __init pm8xxx_led_init(void) |
| 422 | { |
| 423 | return platform_driver_register(&pm8xxx_led_driver); |
| 424 | } |
Jay Chokshi | 12e49bf | 2011-07-22 16:24:39 -0700 | [diff] [blame^] | 425 | subsys_initcall(pm8xxx_led_init); |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 426 | |
| 427 | static void __exit pm8xxx_led_exit(void) |
| 428 | { |
| 429 | platform_driver_unregister(&pm8xxx_led_driver); |
| 430 | } |
| 431 | module_exit(pm8xxx_led_exit); |
| 432 | |
| 433 | MODULE_DESCRIPTION("PM8XXX LEDs driver"); |
| 434 | MODULE_LICENSE("GPL v2"); |
| 435 | MODULE_VERSION("1.0"); |
| 436 | MODULE_ALIAS("platform:pm8xxx-led"); |