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Linux/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                 dev_err(&pdev->dev, "Could not allocate struct sunfire_drvdata\n");
140                 return -ENOMEM;
141         }
142 
143         for (i = 0; i < NUM_LEDS_PER_BOARD; i++) {
144                 struct led_classdev *lp = &p->leds[i].led_cdev;
145 
146                 p->leds[i].reg = (void __iomem *) pdev->resource[0].start;
147                 lp->name = types[i].name;
148                 lp->brightness = LED_FULL;
149                 lp->brightness_set = types[i].handler;
150                 lp->default_trigger = types[i].default_trigger;
151 
152                 err = led_classdev_register(&pdev->dev, lp);
153                 if (err) {
154                         dev_err(&pdev->dev, "Could not register %s LED\n",
155                                lp->name);
156                         for (i--; i >= 0; i--)
157                                 led_classdev_unregister(&p->leds[i].led_cdev);
158                         return err;
159                 }
160         }
161 
162         platform_set_drvdata(pdev, p);
163 
164         return 0;
165 }
166 
167 static int sunfire_led_generic_remove(struct platform_device *pdev)
168 {
169         struct sunfire_drvdata *p = platform_get_drvdata(pdev);
170         int i;
171 
172         for (i = 0; i < NUM_LEDS_PER_BOARD; i++)
173                 led_classdev_unregister(&p->leds[i].led_cdev);
174 
175         return 0;
176 }
177 
178 static struct led_type clockboard_led_types[NUM_LEDS_PER_BOARD] = {
179         {
180                 .name           = "clockboard-left",
181                 .handler        = clockboard_left_set,
182         },
183         {
184                 .name           = "clockboard-middle",
185                 .handler        = clockboard_middle_set,
186         },
187         {
188                 .name           = "clockboard-right",
189                 .handler        = clockboard_right_set,
190                 .default_trigger = "heartbeat",
191         },
192 };
193 
194 static int sunfire_clockboard_led_probe(struct platform_device *pdev)
195 {
196         return sunfire_led_generic_probe(pdev, clockboard_led_types);
197 }
198 
199 static struct led_type fhc_led_types[NUM_LEDS_PER_BOARD] = {
200         {
201                 .name           = "fhc-left",
202                 .handler        = fhc_left_set,
203         },
204         {
205                 .name           = "fhc-middle",
206                 .handler        = fhc_middle_set,
207         },
208         {
209                 .name           = "fhc-right",
210                 .handler        = fhc_right_set,
211                 .default_trigger = "heartbeat",
212         },
213 };
214 
215 static int sunfire_fhc_led_probe(struct platform_device *pdev)
216 {
217         return sunfire_led_generic_probe(pdev, fhc_led_types);
218 }
219 
220 MODULE_ALIAS("platform:sunfire-clockboard-leds");
221 MODULE_ALIAS("platform:sunfire-fhc-leds");
222 
223 static struct platform_driver sunfire_clockboard_led_driver = {
224         .probe          = sunfire_clockboard_led_probe,
225         .remove         = sunfire_led_generic_remove,
226         .driver         = {
227                 .name   = "sunfire-clockboard-leds",
228                 .owner  = THIS_MODULE,
229         },
230 };
231 
232 static struct platform_driver sunfire_fhc_led_driver = {
233         .probe          = sunfire_fhc_led_probe,
234         .remove         = sunfire_led_generic_remove,
235         .driver         = {
236                 .name   = "sunfire-fhc-leds",
237                 .owner  = THIS_MODULE,
238         },
239 };
240 
241 static int __init sunfire_leds_init(void)
242 {
243         int err = platform_driver_register(&sunfire_clockboard_led_driver);
244 
245         if (err) {
246                 pr_err("Could not register clock board LED driver\n");
247                 return err;
248         }
249 
250         err = platform_driver_register(&sunfire_fhc_led_driver);
251         if (err) {
252                 pr_err("Could not register FHC LED driver\n");
253                 platform_driver_unregister(&sunfire_clockboard_led_driver);
254         }
255 
256         return err;
257 }
258 
259 static void __exit sunfire_leds_exit(void)
260 {
261         platform_driver_unregister(&sunfire_clockboard_led_driver);
262         platform_driver_unregister(&sunfire_fhc_led_driver);
263 }
264 
265 module_init(sunfire_leds_init);
266 module_exit(sunfire_leds_exit);
267 

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