drivers/leds/leds-mc13783.c

   1 /*
   2  * LEDs driver for Freescale MC13783
   3  *
   4  * Copyright (C) 2010 Philippe Rétornaz
   5  *
   6  * Based on leds-da903x:
   7  * Copyright (C) 2008 Compulab, Ltd.
   8  *      Mike Rapoport <mike@compulab.co.il>
   9  *
  10  * Copyright (C) 2006-2008 Marvell International Ltd.
  11  *      Eric Miao <eric.miao@marvell.com>
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License version 2 as
  15  * published by the Free Software Foundation.
  16  */
  17
  18 #include <linux/module.h>
  19 #include <linux/kernel.h>
  20 #include <linux/init.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/leds.h>
  23 #include <linux/workqueue.h>
  24 #include <linux/mfd/mc13783.h>
  25 #include <linux/slab.h>
  26
  27 struct mc13783_led {
  28         struct led_classdev     cdev;
  29         struct work_struct      work;
  30         struct mc13783          *master;
  31         enum led_brightness     new_brightness;
  32         int                     id;
  33 };
  34
  35 #define MC13783_REG_LED_CONTROL_0       51
  36 #define MC13783_LED_C0_ENABLE_BIT       (1 << 0)
  37 #define MC13783_LED_C0_TRIODE_MD_BIT    (1 << 7)
  38 #define MC13783_LED_C0_TRIODE_AD_BIT    (1 << 8)
  39 #define MC13783_LED_C0_TRIODE_KP_BIT    (1 << 9)
  40 #define MC13783_LED_C0_BOOST_BIT        (1 << 10)
  41 #define MC13783_LED_C0_ABMODE_MASK      0x7
  42 #define MC13783_LED_C0_ABMODE           11
  43 #define MC13783_LED_C0_ABREF_MASK       0x3
  44 #define MC13783_LED_C0_ABREF            14
  45
  46 #define MC13783_REG_LED_CONTROL_1       52
  47 #define MC13783_LED_C1_TC1HALF_BIT      (1 << 18)
  48
  49 #define MC13783_REG_LED_CONTROL_2       53
  50 #define MC13783_LED_C2_BL_P_MASK        0xf
  51 #define MC13783_LED_C2_MD_P             9
  52 #define MC13783_LED_C2_AD_P             13
  53 #define MC13783_LED_C2_KP_P             17
  54 #define MC13783_LED_C2_BL_C_MASK        0x7
  55 #define MC13783_LED_C2_MD_C             0
  56 #define MC13783_LED_C2_AD_C             3
  57 #define MC13783_LED_C2_KP_C             6
  58
  59 #define MC13783_REG_LED_CONTROL_3       54
  60 #define MC13783_LED_C3_TC_P             6
  61 #define MC13783_LED_C3_TC_P_MASK        0x1f
  62
  63 #define MC13783_REG_LED_CONTROL_4       55
  64 #define MC13783_REG_LED_CONTROL_5       56
  65
  66 #define MC13783_LED_Cx_PERIOD           21
  67 #define MC13783_LED_Cx_PERIOD_MASK      0x3
  68 #define MC13783_LED_Cx_SLEWLIM_BIT      (1 << 23)
  69 #define MC13783_LED_Cx_TRIODE_TC_BIT    (1 << 23)
  70 #define MC13783_LED_Cx_TC_C_MASK        0x3
  71
  72 static void mc13783_led_work(struct work_struct *work)
  73 {
  74         struct mc13783_led *led = container_of(work, struct mc13783_led, work);
  75         int reg = 0;
  76         int mask = 0;
  77         int value = 0;
  78         int bank, off, shift;
  79
  80         switch (led->id) {
  81         case MC13783_LED_MD:
  82                 reg = MC13783_REG_LED_CONTROL_2;
  83                 mask = MC13783_LED_C2_BL_P_MASK << MC13783_LED_C2_MD_P;
  84                 value = (led->new_brightness >> 4) << MC13783_LED_C2_MD_P;
  85                 break;
  86         case MC13783_LED_AD:
  87                 reg = MC13783_REG_LED_CONTROL_2;
  88                 mask = MC13783_LED_C2_BL_P_MASK << MC13783_LED_C2_AD_P;
  89                 value = (led->new_brightness >> 4) << MC13783_LED_C2_AD_P;
  90                 break;
  91         case MC13783_LED_KP:
  92                 reg = MC13783_REG_LED_CONTROL_2;
  93                 mask = MC13783_LED_C2_BL_P_MASK << MC13783_LED_C2_KP_P;
  94                 value = (led->new_brightness >> 4) << MC13783_LED_C2_KP_P;
  95                 break;
  96         case MC13783_LED_R1:
  97         case MC13783_LED_G1:
  98         case MC13783_LED_B1:
  99         case MC13783_LED_R2:
 100         case MC13783_LED_G2:
 101         case MC13783_LED_B2:
 102         case MC13783_LED_R3:
 103         case MC13783_LED_G3:
 104         case MC13783_LED_B3:
 105                 off = led->id - MC13783_LED_R1;
 106                 bank = off/3;
 107                 reg = MC13783_REG_LED_CONTROL_3 + off/3;
 108                 shift = (off - bank * 3) * 5 + MC13783_LED_C3_TC_P;
 109                 value = (led->new_brightness >> 3) << shift;
 110                 mask = MC13783_LED_C3_TC_P_MASK << shift;
 111                 break;
 112         }
 113
 114         mc13783_lock(led->master);
 115
 116         mc13783_reg_rmw(led->master, reg, mask, value);
 117
 118         mc13783_unlock(led->master);
 119 }
 120
 121 static void mc13783_led_set(struct led_classdev *led_cdev,
 122                            enum led_brightness value)
 123 {
 124         struct mc13783_led *led;
 125
 126         led = container_of(led_cdev, struct mc13783_led, cdev);
 127         led->new_brightness = value;
 128         schedule_work(&led->work);
 129 }
 130
 131 static int __devinit mc13783_led_setup(struct mc13783_led *led, int max_current)
 132 {
 133         int shift = 0;
 134         int mask = 0;
 135         int value = 0;
 136         int reg = 0;
 137         int ret, bank;
 138
 139         switch (led->id) {
 140         case MC13783_LED_MD:
 141                 shift = MC13783_LED_C2_MD_C;
 142                 mask = MC13783_LED_C2_BL_C_MASK;
 143                 value = max_current & MC13783_LED_C2_BL_C_MASK;
 144                 reg = MC13783_REG_LED_CONTROL_2;
 145                 break;
 146         case MC13783_LED_AD:
 147                 shift = MC13783_LED_C2_AD_C;
 148                 mask = MC13783_LED_C2_BL_C_MASK;
 149                 value = max_current & MC13783_LED_C2_BL_C_MASK;
 150                 reg = MC13783_REG_LED_CONTROL_2;
 151                 break;
 152         case MC13783_LED_KP:
 153                 shift = MC13783_LED_C2_KP_C;
 154                 mask = MC13783_LED_C2_BL_C_MASK;
 155                 value = max_current & MC13783_LED_C2_BL_C_MASK;
 156                 reg = MC13783_REG_LED_CONTROL_2;
 157                 break;
 158         case MC13783_LED_R1:
 159         case MC13783_LED_G1:
 160         case MC13783_LED_B1:
 161         case MC13783_LED_R2:
 162         case MC13783_LED_G2:
 163         case MC13783_LED_B2:
 164         case MC13783_LED_R3:
 165         case MC13783_LED_G3:
 166         case MC13783_LED_B3:
 167                 bank = (led->id - MC13783_LED_R1)/3;
 168                 reg = MC13783_REG_LED_CONTROL_3 + bank;
 169                 shift = ((led->id - MC13783_LED_R1) - bank * 3) * 2;
 170                 mask = MC13783_LED_Cx_TC_C_MASK;
 171                 value = max_current & MC13783_LED_Cx_TC_C_MASK;
 172                 break;
 173         }
 174
 175         mc13783_lock(led->master);
 176
 177         ret = mc13783_reg_rmw(led->master, reg, mask << shift,
 178                                                 value << shift);
 179
 180         mc13783_unlock(led->master);
 181         return ret;
 182 }
 183
 184 static int __devinit mc13783_leds_prepare(struct platform_device *pdev)
 185 {
 186         struct mc13783_leds_platform_data *pdata = dev_get_platdata(&pdev->dev);
 187         struct mc13783 *dev = dev_get_drvdata(pdev->dev.parent);
 188         int ret = 0;
 189         int reg = 0;
 190
 191         mc13783_lock(dev);
 192
 193         if (pdata->flags & MC13783_LED_TC1HALF)
 194                 reg |= MC13783_LED_C1_TC1HALF_BIT;
 195
 196         if (pdata->flags & MC13783_LED_SLEWLIMTC)
 197                 reg |= MC13783_LED_Cx_SLEWLIM_BIT;
 198
 199         ret = mc13783_reg_write(dev, MC13783_REG_LED_CONTROL_1, reg);
 200         if (ret)
 201                 goto out;
 202
 203         reg = (pdata->bl_period & MC13783_LED_Cx_PERIOD_MASK) <<
 204                                                         MC13783_LED_Cx_PERIOD;
 205
 206         if (pdata->flags & MC13783_LED_SLEWLIMBL)
 207                 reg |= MC13783_LED_Cx_SLEWLIM_BIT;
 208
 209         ret = mc13783_reg_write(dev, MC13783_REG_LED_CONTROL_2, reg);
 210         if (ret)
 211                 goto out;
 212
 213         reg = (pdata->tc1_period & MC13783_LED_Cx_PERIOD_MASK) <<
 214                                                         MC13783_LED_Cx_PERIOD;
 215
 216         if (pdata->flags & MC13783_LED_TRIODE_TC1)
 217                 reg |= MC13783_LED_Cx_TRIODE_TC_BIT;
 218
 219         ret = mc13783_reg_write(dev, MC13783_REG_LED_CONTROL_3, reg);
 220         if (ret)
 221                 goto out;
 222
 223         reg = (pdata->tc2_period & MC13783_LED_Cx_PERIOD_MASK) <<
 224                                                         MC13783_LED_Cx_PERIOD;
 225
 226         if (pdata->flags & MC13783_LED_TRIODE_TC2)
 227                 reg |= MC13783_LED_Cx_TRIODE_TC_BIT;
 228
 229         ret = mc13783_reg_write(dev, MC13783_REG_LED_CONTROL_4, reg);
 230         if (ret)
 231                 goto out;
 232
 233         reg = (pdata->tc3_period & MC13783_LED_Cx_PERIOD_MASK) <<
 234                                                         MC13783_LED_Cx_PERIOD;
 235
 236         if (pdata->flags & MC13783_LED_TRIODE_TC3)
 237                 reg |= MC13783_LED_Cx_TRIODE_TC_BIT;
 238
 239         ret = mc13783_reg_write(dev, MC13783_REG_LED_CONTROL_5, reg);
 240         if (ret)
 241                 goto out;
 242
 243         reg = MC13783_LED_C0_ENABLE_BIT;
 244         if (pdata->flags & MC13783_LED_TRIODE_MD)
 245                 reg |= MC13783_LED_C0_TRIODE_MD_BIT;
 246         if (pdata->flags & MC13783_LED_TRIODE_AD)
 247                 reg |= MC13783_LED_C0_TRIODE_AD_BIT;
 248         if (pdata->flags & MC13783_LED_TRIODE_KP)
 249                 reg |= MC13783_LED_C0_TRIODE_KP_BIT;
 250         if (pdata->flags & MC13783_LED_BOOST_EN)
 251                 reg |= MC13783_LED_C0_BOOST_BIT;
 252
 253         reg |= (pdata->abmode & MC13783_LED_C0_ABMODE_MASK) <<
 254                                                         MC13783_LED_C0_ABMODE;
 255         reg |= (pdata->abref & MC13783_LED_C0_ABREF_MASK) <<
 256                                                         MC13783_LED_C0_ABREF;
 257
 258         ret = mc13783_reg_write(dev, MC13783_REG_LED_CONTROL_0, reg);
 259
 260 out:
 261         mc13783_unlock(dev);
 262         return ret;
 263 }
 264
 265 static int __devinit mc13783_led_probe(struct platform_device *pdev)
 266 {
 267         struct mc13783_leds_platform_data *pdata = dev_get_platdata(&pdev->dev);
 268         struct mc13783_led_platform_data *led_cur;
 269         struct mc13783_led *led, *led_dat;
 270         int ret, i;
 271         int init_led = 0;
 272
 273         if (pdata == NULL) {
 274                 dev_err(&pdev->dev, "missing platform data\n");
 275                 return -ENODEV;
 276         }
 277
 278         if (pdata->num_leds < 1 || pdata->num_leds > MC13783_LED_MAX) {
 279                 dev_err(&pdev->dev, "Invalid led count %d\n", pdata->num_leds);
 280                 return -EINVAL;
 281         }
 282
 283         led = kzalloc(sizeof(*led) * pdata->num_leds, GFP_KERNEL);
 284         if (led == NULL) {
 285                 dev_err(&pdev->dev, "failed to alloc memory\n");
 286                 return -ENOMEM;
 287         }
 288
 289         ret = mc13783_leds_prepare(pdev);
 290         if (ret) {
 291                 dev_err(&pdev->dev, "unable to init led driver\n");
 292                 goto err_free;
 293         }
 294
 295         for (i = 0; i < pdata->num_leds; i++) {
 296                 led_dat = &led[i];
 297                 led_cur = &pdata->led[i];
 298
 299                 if (led_cur->id > MC13783_LED_MAX || led_cur->id < 0) {
 300                         dev_err(&pdev->dev, "invalid id %d\n", led_cur->id);
 301                         ret = -EINVAL;
 302                         goto err_register;
 303                 }
 304
 305                 if (init_led & (1 << led_cur->id)) {
 306                         dev_err(&pdev->dev, "led %d already initialized\n",
 307                                         led_cur->id);
 308                         ret = -EINVAL;
 309                         goto err_register;
 310                 }
 311
 312                 init_led |= 1 << led_cur->id;
 313                 led_dat->cdev.name = led_cur->name;
 314                 led_dat->cdev.default_trigger = led_cur->default_trigger;
 315                 led_dat->cdev.brightness_set = mc13783_led_set;
 316                 led_dat->cdev.brightness = LED_OFF;
 317                 led_dat->id = led_cur->id;
 318                 led_dat->master = dev_get_drvdata(pdev->dev.parent);
 319
 320                 INIT_WORK(&led_dat->work, mc13783_led_work);
 321
 322                 ret = led_classdev_register(pdev->dev.parent, &led_dat->cdev);
 323                 if (ret) {
 324                         dev_err(&pdev->dev, "failed to register led %d\n",
 325                                         led_dat->id);
 326                         goto err_register;
 327                 }
 328
 329                 ret = mc13783_led_setup(led_dat, led_cur->max_current);
 330                 if (ret) {
 331                         dev_err(&pdev->dev, "unable to init led %d\n",
 332                                         led_dat->id);
 333                         i++;
 334                         goto err_register;
 335                 }
 336         }
 337
 338         platform_set_drvdata(pdev, led);
 339         return 0;
 340
 341 err_register:
 342         for (i = i - 1; i >= 0; i--) {
 343                 led_classdev_unregister(&led[i].cdev);
 344                 cancel_work_sync(&led[i].work);
 345         }
 346
 347 err_free:
 348         kfree(led);
 349         return ret;
 350 }
 351
 352 static int __devexit mc13783_led_remove(struct platform_device *pdev)
 353 {
 354         struct mc13783_leds_platform_data *pdata = dev_get_platdata(&pdev->dev);
 355         struct mc13783_led *led = platform_get_drvdata(pdev);
 356         struct mc13783 *dev = dev_get_drvdata(pdev->dev.parent);
 357         int i;
 358
 359         for (i = 0; i < pdata->num_leds; i++) {
 360                 led_classdev_unregister(&led[i].cdev);
 361                 cancel_work_sync(&led[i].work);
 362         }
 363
 364         mc13783_lock(dev);
 365
 366         mc13783_reg_write(dev, MC13783_REG_LED_CONTROL_0, 0);
 367         mc13783_reg_write(dev, MC13783_REG_LED_CONTROL_1, 0);
 368         mc13783_reg_write(dev, MC13783_REG_LED_CONTROL_2, 0);
 369         mc13783_reg_write(dev, MC13783_REG_LED_CONTROL_3, 0);
 370         mc13783_reg_write(dev, MC13783_REG_LED_CONTROL_4, 0);
 371         mc13783_reg_write(dev, MC13783_REG_LED_CONTROL_5, 0);
 372
 373         mc13783_unlock(dev);
 374
 375         kfree(led);
 376         return 0;
 377 }
 378
 379 static struct platform_driver mc13783_led_driver = {
 380         .driver = {
 381                 .name   = "mc13783-led",
 382                 .owner  = THIS_MODULE,
 383         },
 384         .probe          = mc13783_led_probe,
 385         .remove         = __devexit_p(mc13783_led_remove),
 386 };
 387
 388 static int __init mc13783_led_init(void)
 389 {
 390         return platform_driver_register(&mc13783_led_driver);
 391 }
 392 module_init(mc13783_led_init);
 393
 394 static void __exit mc13783_led_exit(void)
 395 {
 396         platform_driver_unregister(&mc13783_led_driver);
 397 }
 398 module_exit(mc13783_led_exit);
 399
 400 MODULE_DESCRIPTION("LEDs driver for Freescale MC13783 PMIC");
 401 MODULE_AUTHOR("Philippe Retornaz <philippe.retornaz@epfl.ch>");
 402 MODULE_LICENSE("GPL");
 403 MODULE_ALIAS("platform:mc13783-led");