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