drivers/leds/leds-mc13783.c

   1 /*
   2  * LEDs driver for Freescale MC13783/MC13892/MC34708
   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/of.h>
  24 #include <linux/workqueue.h>
  25 #include <linux/mfd/mc13xxx.h>
  26
  27 struct mc13xxx_led_devtype {
  28         int     led_min;
  29         int     led_max;
  30         int     num_regs;
  31         u32     ledctrl_base;
  32 };
  33
  34 struct mc13xxx_led {
  35         struct led_classdev     cdev;
  36         struct work_struct      work;
  37         enum led_brightness     new_brightness;
  38         int                     id;
  39         struct mc13xxx_leds     *leds;
  40 };
  41
  42 struct mc13xxx_leds {
  43         struct mc13xxx                  *master;
  44         struct mc13xxx_led_devtype      *devtype;
  45         int                             num_leds;
  46         struct mc13xxx_led              *led;
  47 };
  48
  49 static unsigned int mc13xxx_max_brightness(int id)
  50 {
  51         if (id >= MC13783_LED_MD && id <= MC13783_LED_KP)
  52                 return 0x0f;
  53         else if (id >= MC13783_LED_R1 && id <= MC13783_LED_B3)
  54                 return 0x1f;
  55
  56         return 0x3f;
  57 }
  58
  59 static void mc13xxx_led_work(struct work_struct *work)
  60 {
  61         struct mc13xxx_led *led = container_of(work, struct mc13xxx_led, work);
  62         struct mc13xxx_leds *leds = led->leds;
  63         unsigned int reg, bank, off, shift;
  64
  65         switch (led->id) {
  66         case MC13783_LED_MD:
  67         case MC13783_LED_AD:
  68         case MC13783_LED_KP:
  69                 reg = 2;
  70                 shift = 9 + (led->id - MC13783_LED_MD) * 4;
  71                 break;
  72         case MC13783_LED_R1:
  73         case MC13783_LED_G1:
  74         case MC13783_LED_B1:
  75         case MC13783_LED_R2:
  76         case MC13783_LED_G2:
  77         case MC13783_LED_B2:
  78         case MC13783_LED_R3:
  79         case MC13783_LED_G3:
  80         case MC13783_LED_B3:
  81                 off = led->id - MC13783_LED_R1;
  82                 bank = off / 3;
  83                 reg = 3 + bank;
  84                 shift = (off - bank * 3) * 5 + 6;
  85                 break;
  86         case MC13892_LED_MD:
  87         case MC13892_LED_AD:
  88         case MC13892_LED_KP:
  89                 reg = (led->id - MC13892_LED_MD) / 2;
  90                 shift = 3 + (led->id - MC13892_LED_MD) * 12;
  91                 break;
  92         case MC13892_LED_R:
  93         case MC13892_LED_G:
  94         case MC13892_LED_B:
  95                 off = led->id - MC13892_LED_R;
  96                 bank = off / 2;
  97                 reg = 2 + bank;
  98                 shift = (off - bank * 2) * 12 + 3;
  99                 break;
 100         case MC34708_LED_R:
 101         case MC34708_LED_G:
 102                 reg = 0;
 103                 shift = 3 + (led->id - MC34708_LED_R) * 12;
 104                 break;
 105         default:
 106                 BUG();
 107         }
 108
 109         mc13xxx_reg_rmw(leds->master, leds->devtype->ledctrl_base + reg,
 110                         mc13xxx_max_brightness(led->id) << shift,
 111                         led->new_brightness << shift);
 112 }
 113
 114 static void mc13xxx_led_set(struct led_classdev *led_cdev,
 115                             enum led_brightness value)
 116 {
 117         struct mc13xxx_led *led =
 118                 container_of(led_cdev, struct mc13xxx_led, cdev);
 119
 120         led->new_brightness = value;
 121         schedule_work(&led->work);
 122 }
 123
 124 #ifdef CONFIG_OF
 125 static struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt(
 126         struct platform_device *pdev)
 127 {
 128         struct mc13xxx_leds *leds = platform_get_drvdata(pdev);
 129         struct mc13xxx_leds_platform_data *pdata;
 130         struct device_node *parent, *child;
 131         struct device *dev = &pdev->dev;
 132         int i = 0, ret = -ENODATA;
 133
 134         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 135         if (!pdata)
 136                 return ERR_PTR(-ENOMEM);
 137
 138         of_node_get(dev->parent->of_node);
 139
 140         parent = of_find_node_by_name(dev->parent->of_node, "leds");
 141         if (!parent)
 142                 goto out_node_put;
 143
 144         ret = of_property_read_u32_array(parent, "led-control",
 145                                          pdata->led_control,
 146                                          leds->devtype->num_regs);
 147         if (ret)
 148                 goto out_node_put;
 149
 150         pdata->num_leds = of_get_child_count(parent);
 151
 152         pdata->led = devm_kzalloc(dev, pdata->num_leds * sizeof(*pdata->led),
 153                                   GFP_KERNEL);
 154         if (!pdata->led) {
 155                 ret = -ENOMEM;
 156                 goto out_node_put;
 157         }
 158
 159         for_each_child_of_node(parent, child) {
 160                 const char *str;
 161                 u32 tmp;
 162
 163                 if (of_property_read_u32(child, "reg", &tmp))
 164                         continue;
 165                 pdata->led[i].id = leds->devtype->led_min + tmp;
 166
 167                 if (!of_property_read_string(child, "label", &str))
 168                         pdata->led[i].name = str;
 169                 if (!of_property_read_string(child, "linux,default-trigger",
 170                                              &str))
 171                         pdata->led[i].default_trigger = str;
 172
 173                 i++;
 174         }
 175
 176         pdata->num_leds = i;
 177         ret = i > 0 ? 0 : -ENODATA;
 178
 179 out_node_put:
 180         of_node_put(parent);
 181
 182         return ret ? ERR_PTR(ret) : pdata;
 183 }
 184 #else
 185 static inline struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt(
 186         struct platform_device *pdev)
 187 {
 188         return ERR_PTR(-ENOSYS);
 189 }
 190 #endif
 191
 192 static int __init mc13xxx_led_probe(struct platform_device *pdev)
 193 {
 194         struct device *dev = &pdev->dev;
 195         struct mc13xxx_leds_platform_data *pdata = dev_get_platdata(dev);
 196         struct mc13xxx *mcdev = dev_get_drvdata(dev->parent);
 197         struct mc13xxx_led_devtype *devtype =
 198                 (struct mc13xxx_led_devtype *)pdev->id_entry->driver_data;
 199         struct mc13xxx_leds *leds;
 200         int i, id, ret = -ENODATA;
 201         u32 init_led = 0;
 202
 203         leds = devm_kzalloc(dev, sizeof(*leds), GFP_KERNEL);
 204         if (!leds)
 205                 return -ENOMEM;
 206
 207         leds->devtype = devtype;
 208         leds->master = mcdev;
 209         platform_set_drvdata(pdev, leds);
 210
 211         if (dev->parent->of_node) {
 212                 pdata = mc13xxx_led_probe_dt(pdev);
 213                 if (IS_ERR(pdata))
 214                         return PTR_ERR(pdata);
 215         } else if (!pdata)
 216                 return -ENODATA;
 217
 218         leds->num_leds = pdata->num_leds;
 219
 220         if ((leds->num_leds < 1) ||
 221             (leds->num_leds > (devtype->led_max - devtype->led_min + 1))) {
 222                 dev_err(dev, "Invalid LED count %d\n", leds->num_leds);
 223                 return -EINVAL;
 224         }
 225
 226         leds->led = devm_kzalloc(dev, leds->num_leds * sizeof(*leds->led),
 227                                  GFP_KERNEL);
 228         if (!leds->led)
 229                 return -ENOMEM;
 230
 231         for (i = 0; i < devtype->num_regs; i++) {
 232                 ret = mc13xxx_reg_write(mcdev, leds->devtype->ledctrl_base + i,
 233                                         pdata->led_control[i]);
 234                 if (ret)
 235                         return ret;
 236         }
 237
 238         for (i = 0; i < leds->num_leds; i++) {
 239                 const char *name, *trig;
 240
 241                 ret = -EINVAL;
 242
 243                 id = pdata->led[i].id;
 244                 name = pdata->led[i].name;
 245                 trig = pdata->led[i].default_trigger;
 246
 247                 if ((id > devtype->led_max) || (id < devtype->led_min)) {
 248                         dev_err(dev, "Invalid ID %i\n", id);
 249                         break;
 250                 }
 251
 252                 if (init_led & (1 << id)) {
 253                         dev_warn(dev, "LED %i already initialized\n", id);
 254                         break;
 255                 }
 256
 257                 init_led |= 1 << id;
 258                 leds->led[i].id = id;
 259                 leds->led[i].leds = leds;
 260                 leds->led[i].cdev.name = name;
 261                 leds->led[i].cdev.default_trigger = trig;
 262                 leds->led[i].cdev.flags = LED_CORE_SUSPENDRESUME;
 263                 leds->led[i].cdev.brightness_set = mc13xxx_led_set;
 264                 leds->led[i].cdev.max_brightness = mc13xxx_max_brightness(id);
 265
 266                 INIT_WORK(&leds->led[i].work, mc13xxx_led_work);
 267
 268                 ret = led_classdev_register(dev->parent, &leds->led[i].cdev);
 269                 if (ret) {
 270                         dev_err(dev, "Failed to register LED %i\n", id);
 271                         break;
 272                 }
 273         }
 274
 275         if (ret)
 276                 while (--i >= 0) {
 277                         led_classdev_unregister(&leds->led[i].cdev);
 278                         cancel_work_sync(&leds->led[i].work);
 279                 }
 280
 281         return ret;
 282 }
 283
 284 static int mc13xxx_led_remove(struct platform_device *pdev)
 285 {
 286         struct mc13xxx_leds *leds = platform_get_drvdata(pdev);
 287         int i;
 288
 289         for (i = 0; i < leds->num_leds; i++) {
 290                 led_classdev_unregister(&leds->led[i].cdev);
 291                 cancel_work_sync(&leds->led[i].work);
 292         }
 293
 294         return 0;
 295 }
 296
 297 static const struct mc13xxx_led_devtype mc13783_led_devtype = {
 298         .led_min        = MC13783_LED_MD,
 299         .led_max        = MC13783_LED_B3,
 300         .num_regs       = 6,
 301         .ledctrl_base   = 51,
 302 };
 303
 304 static const struct mc13xxx_led_devtype mc13892_led_devtype = {
 305         .led_min        = MC13892_LED_MD,
 306         .led_max        = MC13892_LED_B,
 307         .num_regs       = 4,
 308         .ledctrl_base   = 51,
 309 };
 310
 311 static const struct mc13xxx_led_devtype mc34708_led_devtype = {
 312         .led_min        = MC34708_LED_R,
 313         .led_max        = MC34708_LED_G,
 314         .num_regs       = 1,
 315         .ledctrl_base   = 54,
 316 };
 317
 318 static const struct platform_device_id mc13xxx_led_id_table[] = {
 319         { "mc13783-led", (kernel_ulong_t)&mc13783_led_devtype, },
 320         { "mc13892-led", (kernel_ulong_t)&mc13892_led_devtype, },
 321         { "mc34708-led", (kernel_ulong_t)&mc34708_led_devtype, },
 322         { }
 323 };
 324 MODULE_DEVICE_TABLE(platform, mc13xxx_led_id_table);
 325
 326 static struct platform_driver mc13xxx_led_driver = {
 327         .driver = {
 328                 .name   = "mc13xxx-led",
 329                 .owner  = THIS_MODULE,
 330         },
 331         .remove         = mc13xxx_led_remove,
 332         .id_table       = mc13xxx_led_id_table,
 333 };
 334 module_platform_driver_probe(mc13xxx_led_driver, mc13xxx_led_probe);
 335
 336 MODULE_DESCRIPTION("LEDs driver for Freescale MC13XXX PMIC");
 337 MODULE_AUTHOR("Philippe Retornaz <philippe.retornaz@epfl.ch>");
 338 MODULE_LICENSE("GPL");