linux/drivers/leds/leds-mc13783.c
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   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * LEDs driver for Freescale MC13783/MC13892/MC34708
   4 *
   5 * Copyright (C) 2010 Philippe R\xC3\xA9tornaz
   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/module.h>
  16#include <linux/kernel.h>
  17#include <linux/platform_device.h>
  18#include <linux/leds.h>
  19#include <linux/of.h>
  20#include <linux/mfd/mc13xxx.h>
  21
  22struct mc13xxx_led_devtype {
  23        int     led_min;
  24        int     led_max;
  25        int     num_regs;
  26        u32     ledctrl_base;
  27};
  28
  29struct mc13xxx_led {
  30        struct led_classdev     cdev;
  31        int                     id;
  32        struct mc13xxx_leds     *leds;
  33};
  34
  35struct mc13xxx_leds {
  36        struct mc13xxx                  *master;
  37        struct mc13xxx_led_devtype      *devtype;
  38        int                             num_leds;
  39        struct mc13xxx_led              *led;
  40};
  41
  42static unsigned int mc13xxx_max_brightness(int id)
  43{
  44        if (id >= MC13783_LED_MD && id <= MC13783_LED_KP)
  45                return 0x0f;
  46        else if (id >= MC13783_LED_R1 && id <= MC13783_LED_B3)
  47                return 0x1f;
  48
  49        return 0x3f;
  50}
  51
  52static int mc13xxx_led_set(struct led_classdev *led_cdev,
  53                            enum led_brightness value)
  54{
  55        struct mc13xxx_led *led =
  56                container_of(led_cdev, struct mc13xxx_led, cdev);
  57        struct mc13xxx_leds *leds = led->leds;
  58        unsigned int reg, bank, off, shift;
  59
  60        switch (led->id) {
  61        case MC13783_LED_MD:
  62        case MC13783_LED_AD:
  63        case MC13783_LED_KP:
  64                reg = 2;
  65                shift = 9 + (led->id - MC13783_LED_MD) * 4;
  66                break;
  67        case MC13783_LED_R1:
  68        case MC13783_LED_G1:
  69        case MC13783_LED_B1:
  70        case MC13783_LED_R2:
  71        case MC13783_LED_G2:
  72        case MC13783_LED_B2:
  73        case MC13783_LED_R3:
  74        case MC13783_LED_G3:
  75        case MC13783_LED_B3:
  76                off = led->id - MC13783_LED_R1;
  77                bank = off / 3;
  78                reg = 3 + bank;
  79                shift = (off - bank * 3) * 5 + 6;
  80                break;
  81        case MC13892_LED_MD:
  82        case MC13892_LED_AD:
  83        case MC13892_LED_KP:
  84                off = led->id - MC13892_LED_MD;
  85                reg = off / 2;
  86                shift = 3 + (off - reg * 2) * 12;
  87                break;
  88        case MC13892_LED_R:
  89        case MC13892_LED_G:
  90        case MC13892_LED_B:
  91                off = led->id - MC13892_LED_R;
  92                bank = off / 2;
  93                reg = 2 + bank;
  94                shift = (off - bank * 2) * 12 + 3;
  95                break;
  96        case MC34708_LED_R:
  97        case MC34708_LED_G:
  98                reg = 0;
  99                shift = 3 + (led->id - MC34708_LED_R) * 12;
 100                break;
 101        default:
 102                BUG();
 103        }
 104
 105        return mc13xxx_reg_rmw(leds->master, leds->devtype->ledctrl_base + reg,
 106                        mc13xxx_max_brightness(led->id) << shift,
 107                        value << shift);
 108}
 109
 110#ifdef CONFIG_OF
 111static struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt(
 112        struct platform_device *pdev)
 113{
 114        struct mc13xxx_leds *leds = platform_get_drvdata(pdev);
 115        struct mc13xxx_leds_platform_data *pdata;
 116        struct device_node *parent, *child;
 117        struct device *dev = &pdev->dev;
 118        int i = 0, ret = -ENODATA;
 119
 120        pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 121        if (!pdata)
 122                return ERR_PTR(-ENOMEM);
 123
 124        parent = of_get_child_by_name(dev_of_node(dev->parent), "leds");
 125        if (!parent)
 126                goto out_node_put;
 127
 128        ret = of_property_read_u32_array(parent, "led-control",
 129                                         pdata->led_control,
 130                                         leds->devtype->num_regs);
 131        if (ret)
 132                goto out_node_put;
 133
 134        pdata->num_leds = of_get_available_child_count(parent);
 135
 136        pdata->led = devm_kcalloc(dev, pdata->num_leds, sizeof(*pdata->led),
 137                                  GFP_KERNEL);
 138        if (!pdata->led) {
 139                ret = -ENOMEM;
 140                goto out_node_put;
 141        }
 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        ret = i > 0 ? 0 : -ENODATA;
 162
 163out_node_put:
 164        of_node_put(parent);
 165
 166        return ret ? ERR_PTR(ret) : pdata;
 167}
 168#else
 169static inline struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt(
 170        struct platform_device *pdev)
 171{
 172        return ERR_PTR(-ENOSYS);
 173}
 174#endif
 175
 176static int __init mc13xxx_led_probe(struct platform_device *pdev)
 177{
 178        struct device *dev = &pdev->dev;
 179        struct mc13xxx_leds_platform_data *pdata = dev_get_platdata(dev);
 180        struct mc13xxx *mcdev = dev_get_drvdata(dev->parent);
 181        struct mc13xxx_led_devtype *devtype =
 182                (struct mc13xxx_led_devtype *)pdev->id_entry->driver_data;
 183        struct mc13xxx_leds *leds;
 184        int i, id, ret = -ENODATA;
 185        u32 init_led = 0;
 186
 187        leds = devm_kzalloc(dev, sizeof(*leds), GFP_KERNEL);
 188        if (!leds)
 189                return -ENOMEM;
 190
 191        leds->devtype = devtype;
 192        leds->master = mcdev;
 193        platform_set_drvdata(pdev, leds);
 194
 195        if (dev_of_node(dev->parent)) {
 196                pdata = mc13xxx_led_probe_dt(pdev);
 197                if (IS_ERR(pdata))
 198                        return PTR_ERR(pdata);
 199        } else if (!pdata)
 200                return -ENODATA;
 201
 202        leds->num_leds = pdata->num_leds;
 203
 204        if ((leds->num_leds < 1) ||
 205            (leds->num_leds > (devtype->led_max - devtype->led_min + 1))) {
 206                dev_err(dev, "Invalid LED count %d\n", leds->num_leds);
 207                return -EINVAL;
 208        }
 209
 210        leds->led = devm_kcalloc(dev, leds->num_leds, sizeof(*leds->led),
 211                                 GFP_KERNEL);
 212        if (!leds->led)
 213                return -ENOMEM;
 214
 215        for (i = 0; i < devtype->num_regs; i++) {
 216                ret = mc13xxx_reg_write(mcdev, leds->devtype->ledctrl_base + i,
 217                                        pdata->led_control[i]);
 218                if (ret)
 219                        return ret;
 220        }
 221
 222        for (i = 0; i < leds->num_leds; i++) {
 223                const char *name, *trig;
 224
 225                ret = -EINVAL;
 226
 227                id = pdata->led[i].id;
 228                name = pdata->led[i].name;
 229                trig = pdata->led[i].default_trigger;
 230
 231                if ((id > devtype->led_max) || (id < devtype->led_min)) {
 232                        dev_err(dev, "Invalid ID %i\n", id);
 233                        break;
 234                }
 235
 236                if (init_led & (1 << id)) {
 237                        dev_warn(dev, "LED %i already initialized\n", id);
 238                        break;
 239                }
 240
 241                init_led |= 1 << id;
 242                leds->led[i].id = id;
 243                leds->led[i].leds = leds;
 244                leds->led[i].cdev.name = name;
 245                leds->led[i].cdev.default_trigger = trig;
 246                leds->led[i].cdev.flags = LED_CORE_SUSPENDRESUME;
 247                leds->led[i].cdev.brightness_set_blocking = mc13xxx_led_set;
 248                leds->led[i].cdev.max_brightness = mc13xxx_max_brightness(id);
 249
 250                ret = led_classdev_register(dev->parent, &leds->led[i].cdev);
 251                if (ret) {
 252                        dev_err(dev, "Failed to register LED %i\n", id);
 253                        break;
 254                }
 255        }
 256
 257        if (ret)
 258                while (--i >= 0)
 259                        led_classdev_unregister(&leds->led[i].cdev);
 260
 261        return ret;
 262}
 263
 264static int mc13xxx_led_remove(struct platform_device *pdev)
 265{
 266        struct mc13xxx_leds *leds = platform_get_drvdata(pdev);
 267        int i;
 268
 269        for (i = 0; i < leds->num_leds; i++)
 270                led_classdev_unregister(&leds->led[i].cdev);
 271
 272        return 0;
 273}
 274
 275static const struct mc13xxx_led_devtype mc13783_led_devtype = {
 276        .led_min        = MC13783_LED_MD,
 277        .led_max        = MC13783_LED_B3,
 278        .num_regs       = 6,
 279        .ledctrl_base   = 51,
 280};
 281
 282static const struct mc13xxx_led_devtype mc13892_led_devtype = {
 283        .led_min        = MC13892_LED_MD,
 284        .led_max        = MC13892_LED_B,
 285        .num_regs       = 4,
 286        .ledctrl_base   = 51,
 287};
 288
 289static const struct mc13xxx_led_devtype mc34708_led_devtype = {
 290        .led_min        = MC34708_LED_R,
 291        .led_max        = MC34708_LED_G,
 292        .num_regs       = 1,
 293        .ledctrl_base   = 54,
 294};
 295
 296static const struct platform_device_id mc13xxx_led_id_table[] = {
 297        { "mc13783-led", (kernel_ulong_t)&mc13783_led_devtype, },
 298        { "mc13892-led", (kernel_ulong_t)&mc13892_led_devtype, },
 299        { "mc34708-led", (kernel_ulong_t)&mc34708_led_devtype, },
 300        { }
 301};
 302MODULE_DEVICE_TABLE(platform, mc13xxx_led_id_table);
 303
 304static struct platform_driver mc13xxx_led_driver = {
 305        .driver = {
 306                .name   = "mc13xxx-led",
 307        },
 308        .remove         = mc13xxx_led_remove,
 309        .id_table       = mc13xxx_led_id_table,
 310};
 311module_platform_driver_probe(mc13xxx_led_driver, mc13xxx_led_probe);
 312
 313MODULE_DESCRIPTION("LEDs driver for Freescale MC13XXX PMIC");
 314MODULE_AUTHOR("Philippe Retornaz <philippe.retornaz@epfl.ch>");
 315MODULE_LICENSE("GPL");
 316