drivers/leds/leds-mc13783.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * LEDs driver for Freescale MC13783/MC13892/MC34708
   4  *
   5  * Copyright (C) 2010 Philippe Rétornaz
   6  *
   7  * Based on leds-da903x:
   8  * Copyright (C) 2008 Compulab, Ltd.
   9  *      Mike Rapoport <mike@compulab.co.il>
  10  *
  11  * Copyright (C) 2006-2008 Marvell International Ltd.
  12  *      Eric Miao <eric.miao@marvell.com>
  13  */
  14
  15 #include <linux/cleanup.h>
  16 #include <linux/module.h>
  17 #include <linux/kernel.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/leds.h>
  20 #include <linux/of.h>
  21 #include <linux/mfd/mc13xxx.h>
  22
  23 struct mc13xxx_led_devtype {
  24         int     led_min;
  25         int     led_max;
  26         int     num_regs;
  27         u32     ledctrl_base;
  28 };
  29
  30 struct mc13xxx_led {
  31         struct led_classdev     cdev;
  32         int                     id;
  33         struct mc13xxx_leds     *leds;
  34 };
  35
  36 struct mc13xxx_leds {
  37         struct mc13xxx                  *master;
  38         struct mc13xxx_led_devtype      *devtype;
  39         int                             num_leds;
  40         struct mc13xxx_led              *led;
  41 };
  42
  43 static unsigned int mc13xxx_max_brightness(int id)
  44 {
  45         if (id >= MC13783_LED_MD && id <= MC13783_LED_KP)
  46                 return 0x0f;
  47         else if (id >= MC13783_LED_R1 && id <= MC13783_LED_B3)
  48                 return 0x1f;
  49
  50         return 0x3f;
  51 }
  52
  53 static int mc13xxx_led_set(struct led_classdev *led_cdev,
  54                             enum led_brightness value)
  55 {
  56         struct mc13xxx_led *led =
  57                 container_of(led_cdev, struct mc13xxx_led, cdev);
  58         struct mc13xxx_leds *leds = led->leds;
  59         unsigned int reg, bank, off, shift;
  60
  61         switch (led->id) {
  62         case MC13783_LED_MD:
  63         case MC13783_LED_AD:
  64         case MC13783_LED_KP:
  65                 reg = 2;
  66                 shift = 9 + (led->id - MC13783_LED_MD) * 4;
  67                 break;
  68         case MC13783_LED_R1:
  69         case MC13783_LED_G1:
  70         case MC13783_LED_B1:
  71         case MC13783_LED_R2:
  72         case MC13783_LED_G2:
  73         case MC13783_LED_B2:
  74         case MC13783_LED_R3:
  75         case MC13783_LED_G3:
  76         case MC13783_LED_B3:
  77                 off = led->id - MC13783_LED_R1;
  78                 bank = off / 3;
  79                 reg = 3 + bank;
  80                 shift = (off - bank * 3) * 5 + 6;
  81                 break;
  82         case MC13892_LED_MD:
  83         case MC13892_LED_AD:
  84         case MC13892_LED_KP:
  85                 off = led->id - MC13892_LED_MD;
  86                 reg = off / 2;
  87                 shift = 3 + (off - reg * 2) * 12;
  88                 break;
  89         case MC13892_LED_R:
  90         case MC13892_LED_G:
  91         case MC13892_LED_B:
  92                 off = led->id - MC13892_LED_R;
  93                 bank = off / 2;
  94                 reg = 2 + bank;
  95                 shift = (off - bank * 2) * 12 + 3;
  96                 break;
  97         case MC34708_LED_R:
  98         case MC34708_LED_G:
  99                 reg = 0;
 100                 shift = 3 + (led->id - MC34708_LED_R) * 12;
 101                 break;
 102         default:
 103                 BUG();
 104         }
 105
 106         return mc13xxx_reg_rmw(leds->master, leds->devtype->ledctrl_base + reg,
 107                         mc13xxx_max_brightness(led->id) << shift,
 108                         value << shift);
 109 }
 110
 111 #ifdef CONFIG_OF
 112 static struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt(
 113         struct platform_device *pdev)
 114 {
 115         struct mc13xxx_leds *leds = platform_get_drvdata(pdev);
 116         struct mc13xxx_leds_platform_data *pdata;
 117         struct device_node *child;
 118         struct device *dev = &pdev->dev;
 119         int i = 0, ret = -ENODATA;
 120
 121         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 122         if (!pdata)
 123                 return ERR_PTR(-ENOMEM);
 124
 125         struct device_node *parent __free(device_node) =
 126                 of_get_child_by_name(dev_of_node(dev->parent), "leds");
 127         if (!parent)
 128                 return ERR_PTR(-ENODATA);
 129
 130         ret = of_property_read_u32_array(parent, "led-control",
 131                                          pdata->led_control,
 132                                          leds->devtype->num_regs);
 133         if (ret)
 134                 return ERR_PTR(ret);
 135
 136         pdata->num_leds = of_get_available_child_count(parent);
 137
 138         pdata->led = devm_kcalloc(dev, pdata->num_leds, sizeof(*pdata->led),
 139                                   GFP_KERNEL);
 140         if (!pdata->led)
 141                 return ERR_PTR(-ENOMEM);
 142
 143         for_each_available_child_of_node(parent, child) {
 144                 const char *str;
 145                 u32 tmp;
 146
 147                 if (of_property_read_u32(child, "reg", &tmp))
 148                         continue;
 149                 pdata->led[i].id = leds->devtype->led_min + tmp;
 150
 151                 if (!of_property_read_string(child, "label", &str))
 152                         pdata->led[i].name = str;
 153                 if (!of_property_read_string(child, "linux,default-trigger",
 154                                              &str))
 155                         pdata->led[i].default_trigger = str;
 156
 157                 i++;
 158         }
 159
 160         pdata->num_leds = i;
 161         if (i <= 0)
 162                 return ERR_PTR(-ENODATA);
 163
 164         return pdata;
 165 }
 166 #else
 167 static inline struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt(
 168         struct platform_device *pdev)
 169 {
 170         return ERR_PTR(-ENOSYS);
 171 }
 172 #endif
 173
 174 static int __init mc13xxx_led_probe(struct platform_device *pdev)
 175 {
 176         struct device *dev = &pdev->dev;
 177         struct mc13xxx_leds_platform_data *pdata = dev_get_platdata(dev);
 178         struct mc13xxx *mcdev = dev_get_drvdata(dev->parent);
 179         struct mc13xxx_led_devtype *devtype =
 180                 (struct mc13xxx_led_devtype *)pdev->id_entry->driver_data;
 181         struct mc13xxx_leds *leds;
 182         int i, id, ret = -ENODATA;
 183         u32 init_led = 0;
 184
 185         leds = devm_kzalloc(dev, sizeof(*leds), GFP_KERNEL);
 186         if (!leds)
 187                 return -ENOMEM;
 188
 189         leds->devtype = devtype;
 190         leds->master = mcdev;
 191         platform_set_drvdata(pdev, leds);
 192
 193         if (dev_of_node(dev->parent)) {
 194                 pdata = mc13xxx_led_probe_dt(pdev);
 195                 if (IS_ERR(pdata))
 196                         return PTR_ERR(pdata);
 197         } else if (!pdata)
 198                 return -ENODATA;
 199
 200         leds->num_leds = pdata->num_leds;
 201
 202         if ((leds->num_leds < 1) ||
 203             (leds->num_leds > (devtype->led_max - devtype->led_min + 1))) {
 204                 dev_err(dev, "Invalid LED count %d\n", leds->num_leds);
 205                 return -EINVAL;
 206         }
 207
 208         leds->led = devm_kcalloc(dev, leds->num_leds, sizeof(*leds->led),
 209                                  GFP_KERNEL);
 210         if (!leds->led)
 211                 return -ENOMEM;
 212
 213         for (i = 0; i < devtype->num_regs; i++) {
 214                 ret = mc13xxx_reg_write(mcdev, leds->devtype->ledctrl_base + i,
 215                                         pdata->led_control[i]);
 216                 if (ret)
 217                         return ret;
 218         }
 219
 220         for (i = 0; i < leds->num_leds; i++) {
 221                 const char *name, *trig;
 222
 223                 ret = -EINVAL;
 224
 225                 id = pdata->led[i].id;
 226                 name = pdata->led[i].name;
 227                 trig = pdata->led[i].default_trigger;
 228
 229                 if ((id > devtype->led_max) || (id < devtype->led_min)) {
 230                         dev_err(dev, "Invalid ID %i\n", id);
 231                         break;
 232                 }
 233
 234                 if (init_led & (1 << id)) {
 235                         dev_warn(dev, "LED %i already initialized\n", id);
 236                         break;
 237                 }
 238
 239                 init_led |= 1 << id;
 240                 leds->led[i].id = id;
 241                 leds->led[i].leds = leds;
 242                 leds->led[i].cdev.name = name;
 243                 leds->led[i].cdev.default_trigger = trig;
 244                 leds->led[i].cdev.flags = LED_CORE_SUSPENDRESUME;
 245                 leds->led[i].cdev.brightness_set_blocking = mc13xxx_led_set;
 246                 leds->led[i].cdev.max_brightness = mc13xxx_max_brightness(id);
 247
 248                 ret = led_classdev_register(dev->parent, &leds->led[i].cdev);
 249                 if (ret) {
 250                         dev_err(dev, "Failed to register LED %i\n", id);
 251                         break;
 252                 }
 253         }
 254
 255         if (ret)
 256                 while (--i >= 0)
 257                         led_classdev_unregister(&leds->led[i].cdev);
 258
 259         return ret;
 260 }
 261
 262 static void mc13xxx_led_remove(struct platform_device *pdev)
 263 {
 264         struct mc13xxx_leds *leds = platform_get_drvdata(pdev);
 265         int i;
 266
 267         for (i = 0; i < leds->num_leds; i++)
 268                 led_classdev_unregister(&leds->led[i].cdev);
 269 }
 270
 271 static const struct mc13xxx_led_devtype mc13783_led_devtype = {
 272         .led_min        = MC13783_LED_MD,
 273         .led_max        = MC13783_LED_B3,
 274         .num_regs       = 6,
 275         .ledctrl_base   = 51,
 276 };
 277
 278 static const struct mc13xxx_led_devtype mc13892_led_devtype = {
 279         .led_min        = MC13892_LED_MD,
 280         .led_max        = MC13892_LED_B,
 281         .num_regs       = 4,
 282         .ledctrl_base   = 51,
 283 };
 284
 285 static const struct mc13xxx_led_devtype mc34708_led_devtype = {
 286         .led_min        = MC34708_LED_R,
 287         .led_max        = MC34708_LED_G,
 288         .num_regs       = 1,
 289         .ledctrl_base   = 54,
 290 };
 291
 292 static const struct platform_device_id mc13xxx_led_id_table[] = {
 293         { "mc13783-led", (kernel_ulong_t)&mc13783_led_devtype, },
 294         { "mc13892-led", (kernel_ulong_t)&mc13892_led_devtype, },
 295         { "mc34708-led", (kernel_ulong_t)&mc34708_led_devtype, },
 296         { }
 297 };
 298 MODULE_DEVICE_TABLE(platform, mc13xxx_led_id_table);
 299
 300 static struct platform_driver mc13xxx_led_driver = {
 301         .driver = {
 302                 .name   = "mc13xxx-led",
 303         },
 304         .remove_new     = mc13xxx_led_remove,
 305         .id_table       = mc13xxx_led_id_table,
 306 };
 307 module_platform_driver_probe(mc13xxx_led_driver, mc13xxx_led_probe);
 308
 309 MODULE_DESCRIPTION("LEDs driver for Freescale MC13XXX PMIC");
 310 MODULE_AUTHOR("Philippe Retornaz <philippe.retornaz@epfl.ch>");
 311 MODULE_LICENSE("GPL");