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