drivers/leds/leds-sunfire.c

   1 /* leds-sunfire.c: SUNW,Ultra-Enterprise LED driver.
   2  *
   3  * Copyright (C) 2008 David S. Miller <davem@davemloft.net>
   4  */
   5
   6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   7
   8 #include <linux/kernel.h>
   9 #include <linux/module.h>
  10 #include <linux/init.h>
  11 #include <linux/leds.h>
  12 #include <linux/io.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/slab.h>
  15
  16 #include <asm/fhc.h>
  17 #include <asm/upa.h>
  18
  19 MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
  20 MODULE_DESCRIPTION("Sun Fire LED driver");
  21 MODULE_LICENSE("GPL");
  22
  23 struct sunfire_led {
  24         struct led_classdev     led_cdev;
  25         void __iomem            *reg;
  26 };
  27 #define to_sunfire_led(d) container_of(d, struct sunfire_led, led_cdev)
  28
  29 static void __clockboard_set(struct led_classdev *led_cdev,
  30                              enum led_brightness led_val, u8 bit)
  31 {
  32         struct sunfire_led *p = to_sunfire_led(led_cdev);
  33         u8 reg = upa_readb(p->reg);
  34
  35         switch (bit) {
  36         case CLOCK_CTRL_LLED:
  37                 if (led_val)
  38                         reg &= ~bit;
  39                 else
  40                         reg |= bit;
  41                 break;
  42
  43         default:
  44                 if (led_val)
  45                         reg |= bit;
  46                 else
  47                         reg &= ~bit;
  48                 break;
  49         }
  50         upa_writeb(reg, p->reg);
  51 }
  52
  53 static void clockboard_left_set(struct led_classdev *led_cdev,
  54                                 enum led_brightness led_val)
  55 {
  56         __clockboard_set(led_cdev, led_val, CLOCK_CTRL_LLED);
  57 }
  58
  59 static void clockboard_middle_set(struct led_classdev *led_cdev,
  60                                   enum led_brightness led_val)
  61 {
  62         __clockboard_set(led_cdev, led_val, CLOCK_CTRL_MLED);
  63 }
  64
  65 static void clockboard_right_set(struct led_classdev *led_cdev,
  66                                  enum led_brightness led_val)
  67 {
  68         __clockboard_set(led_cdev, led_val, CLOCK_CTRL_RLED);
  69 }
  70
  71 static void __fhc_set(struct led_classdev *led_cdev,
  72                              enum led_brightness led_val, u32 bit)
  73 {
  74         struct sunfire_led *p = to_sunfire_led(led_cdev);
  75         u32 reg = upa_readl(p->reg);
  76
  77         switch (bit) {
  78         case FHC_CONTROL_LLED:
  79                 if (led_val)
  80                         reg &= ~bit;
  81                 else
  82                         reg |= bit;
  83                 break;
  84
  85         default:
  86                 if (led_val)
  87                         reg |= bit;
  88                 else
  89                         reg &= ~bit;
  90                 break;
  91         }
  92         upa_writel(reg, p->reg);
  93 }
  94
  95 static void fhc_left_set(struct led_classdev *led_cdev,
  96                          enum led_brightness led_val)
  97 {
  98         __fhc_set(led_cdev, led_val, FHC_CONTROL_LLED);
  99 }
 100
 101 static void fhc_middle_set(struct led_classdev *led_cdev,
 102                            enum led_brightness led_val)
 103 {
 104         __fhc_set(led_cdev, led_val, FHC_CONTROL_MLED);
 105 }
 106
 107 static void fhc_right_set(struct led_classdev *led_cdev,
 108                           enum led_brightness led_val)
 109 {
 110         __fhc_set(led_cdev, led_val, FHC_CONTROL_RLED);
 111 }
 112
 113 typedef void (*set_handler)(struct led_classdev *, enum led_brightness);
 114 struct led_type {
 115         const char      *name;
 116         set_handler     handler;
 117         const char      *default_trigger;
 118 };
 119
 120 #define NUM_LEDS_PER_BOARD      3
 121 struct sunfire_drvdata {
 122         struct sunfire_led      leds[NUM_LEDS_PER_BOARD];
 123 };
 124
 125 static int sunfire_led_generic_probe(struct platform_device *pdev,
 126                                                struct led_type *types)
 127 {
 128         struct sunfire_drvdata *p;
 129         int i, err;
 130
 131         if (pdev->num_resources != 1) {
 132                 dev_err(&pdev->dev, "Wrong number of resources %d, should be 1\n",
 133                        pdev->num_resources);
 134                 return -EINVAL;
 135         }
 136
 137         p = devm_kzalloc(&pdev->dev, sizeof(*p), GFP_KERNEL);
 138         if (!p)
 139                 return -ENOMEM;
 140
 141         for (i = 0; i < NUM_LEDS_PER_BOARD; i++) {
 142                 struct led_classdev *lp = &p->leds[i].led_cdev;
 143
 144                 p->leds[i].reg = (void __iomem *) pdev->resource[0].start;
 145                 lp->name = types[i].name;
 146                 lp->brightness = LED_FULL;
 147                 lp->brightness_set = types[i].handler;
 148                 lp->default_trigger = types[i].default_trigger;
 149
 150                 err = led_classdev_register(&pdev->dev, lp);
 151                 if (err) {
 152                         dev_err(&pdev->dev, "Could not register %s LED\n",
 153                                lp->name);
 154                         for (i--; i >= 0; i--)
 155                                 led_classdev_unregister(&p->leds[i].led_cdev);
 156                         return err;
 157                 }
 158         }
 159
 160         platform_set_drvdata(pdev, p);
 161
 162         return 0;
 163 }
 164
 165 static int sunfire_led_generic_remove(struct platform_device *pdev)
 166 {
 167         struct sunfire_drvdata *p = platform_get_drvdata(pdev);
 168         int i;
 169
 170         for (i = 0; i < NUM_LEDS_PER_BOARD; i++)
 171                 led_classdev_unregister(&p->leds[i].led_cdev);
 172
 173         return 0;
 174 }
 175
 176 static struct led_type clockboard_led_types[NUM_LEDS_PER_BOARD] = {
 177         {
 178                 .name           = "clockboard-left",
 179                 .handler        = clockboard_left_set,
 180         },
 181         {
 182                 .name           = "clockboard-middle",
 183                 .handler        = clockboard_middle_set,
 184         },
 185         {
 186                 .name           = "clockboard-right",
 187                 .handler        = clockboard_right_set,
 188                 .default_trigger = "heartbeat",
 189         },
 190 };
 191
 192 static int sunfire_clockboard_led_probe(struct platform_device *pdev)
 193 {
 194         return sunfire_led_generic_probe(pdev, clockboard_led_types);
 195 }
 196
 197 static struct led_type fhc_led_types[NUM_LEDS_PER_BOARD] = {
 198         {
 199                 .name           = "fhc-left",
 200                 .handler        = fhc_left_set,
 201         },
 202         {
 203                 .name           = "fhc-middle",
 204                 .handler        = fhc_middle_set,
 205         },
 206         {
 207                 .name           = "fhc-right",
 208                 .handler        = fhc_right_set,
 209                 .default_trigger = "heartbeat",
 210         },
 211 };
 212
 213 static int sunfire_fhc_led_probe(struct platform_device *pdev)
 214 {
 215         return sunfire_led_generic_probe(pdev, fhc_led_types);
 216 }
 217
 218 MODULE_ALIAS("platform:sunfire-clockboard-leds");
 219 MODULE_ALIAS("platform:sunfire-fhc-leds");
 220
 221 static struct platform_driver sunfire_clockboard_led_driver = {
 222         .probe          = sunfire_clockboard_led_probe,
 223         .remove         = sunfire_led_generic_remove,
 224         .driver         = {
 225                 .name   = "sunfire-clockboard-leds",
 226         },
 227 };
 228
 229 static struct platform_driver sunfire_fhc_led_driver = {
 230         .probe          = sunfire_fhc_led_probe,
 231         .remove         = sunfire_led_generic_remove,
 232         .driver         = {
 233                 .name   = "sunfire-fhc-leds",
 234         },
 235 };
 236
 237 static struct platform_driver * const drivers[] = {
 238         &sunfire_clockboard_led_driver,
 239         &sunfire_fhc_led_driver,
 240 };
 241
 242 static int __init sunfire_leds_init(void)
 243 {
 244         return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
 245 }
 246
 247 static void __exit sunfire_leds_exit(void)
 248 {
 249         platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
 250 }
 251
 252 module_init(sunfire_leds_init);
 253 module_exit(sunfire_leds_exit);