Root/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#include <linux/kernel.h>
7#include <linux/module.h>
8#include <linux/init.h>
9#include <linux/leds.h>
10#include <linux/io.h>
11#include <linux/platform_device.h>
12#include <linux/slab.h>
13
14#include <asm/fhc.h>
15#include <asm/upa.h>
16
17#define DRIVER_NAME "leds-sunfire"
18#define PFX DRIVER_NAME ": "
19
20MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
21MODULE_DESCRIPTION("Sun Fire LED driver");
22MODULE_LICENSE("GPL");
23
24struct sunfire_led {
25    struct led_classdev led_cdev;
26    void __iomem *reg;
27};
28#define to_sunfire_led(d) container_of(d, struct sunfire_led, led_cdev)
29
30static void __clockboard_set(struct led_classdev *led_cdev,
31                 enum led_brightness led_val, u8 bit)
32{
33    struct sunfire_led *p = to_sunfire_led(led_cdev);
34    u8 reg = upa_readb(p->reg);
35
36    switch (bit) {
37    case CLOCK_CTRL_LLED:
38        if (led_val)
39            reg &= ~bit;
40        else
41            reg |= bit;
42        break;
43
44    default:
45        if (led_val)
46            reg |= bit;
47        else
48            reg &= ~bit;
49        break;
50    }
51    upa_writeb(reg, p->reg);
52}
53
54static void clockboard_left_set(struct led_classdev *led_cdev,
55                enum led_brightness led_val)
56{
57    __clockboard_set(led_cdev, led_val, CLOCK_CTRL_LLED);
58}
59
60static void clockboard_middle_set(struct led_classdev *led_cdev,
61                  enum led_brightness led_val)
62{
63    __clockboard_set(led_cdev, led_val, CLOCK_CTRL_MLED);
64}
65
66static void clockboard_right_set(struct led_classdev *led_cdev,
67                 enum led_brightness led_val)
68{
69    __clockboard_set(led_cdev, led_val, CLOCK_CTRL_RLED);
70}
71
72static void __fhc_set(struct led_classdev *led_cdev,
73                 enum led_brightness led_val, u32 bit)
74{
75    struct sunfire_led *p = to_sunfire_led(led_cdev);
76    u32 reg = upa_readl(p->reg);
77
78    switch (bit) {
79    case FHC_CONTROL_LLED:
80        if (led_val)
81            reg &= ~bit;
82        else
83            reg |= bit;
84        break;
85
86    default:
87        if (led_val)
88            reg |= bit;
89        else
90            reg &= ~bit;
91        break;
92    }
93    upa_writel(reg, p->reg);
94}
95
96static void fhc_left_set(struct led_classdev *led_cdev,
97             enum led_brightness led_val)
98{
99    __fhc_set(led_cdev, led_val, FHC_CONTROL_LLED);
100}
101
102static void fhc_middle_set(struct led_classdev *led_cdev,
103               enum led_brightness led_val)
104{
105    __fhc_set(led_cdev, led_val, FHC_CONTROL_MLED);
106}
107
108static void fhc_right_set(struct led_classdev *led_cdev,
109              enum led_brightness led_val)
110{
111    __fhc_set(led_cdev, led_val, FHC_CONTROL_RLED);
112}
113
114typedef void (*set_handler)(struct led_classdev *, enum led_brightness);
115struct led_type {
116    const char *name;
117    set_handler handler;
118    const char *default_trigger;
119};
120
121#define NUM_LEDS_PER_BOARD 3
122struct sunfire_drvdata {
123    struct sunfire_led leds[NUM_LEDS_PER_BOARD];
124};
125
126static int __devinit sunfire_led_generic_probe(struct platform_device *pdev,
127                           struct led_type *types)
128{
129    struct sunfire_drvdata *p;
130    int i, err;
131
132    if (pdev->num_resources != 1) {
133        printk(KERN_ERR PFX "Wrong number of resources %d, should be 1\n",
134               pdev->num_resources);
135        return -EINVAL;
136    }
137
138    p = devm_kzalloc(&pdev->dev, sizeof(*p), GFP_KERNEL);
139    if (!p) {
140        printk(KERN_ERR PFX "Could not allocate struct sunfire_drvdata\n");
141        return -ENOMEM;
142    }
143
144    for (i = 0; i < NUM_LEDS_PER_BOARD; i++) {
145        struct led_classdev *lp = &p->leds[i].led_cdev;
146
147        p->leds[i].reg = (void __iomem *) pdev->resource[0].start;
148        lp->name = types[i].name;
149        lp->brightness = LED_FULL;
150        lp->brightness_set = types[i].handler;
151        lp->default_trigger = types[i].default_trigger;
152
153        err = led_classdev_register(&pdev->dev, lp);
154        if (err) {
155            printk(KERN_ERR PFX "Could not register %s LED\n",
156                   lp->name);
157            for (i--; i >= 0; i--)
158                led_classdev_unregister(&p->leds[i].led_cdev);
159            return err;
160        }
161    }
162
163    dev_set_drvdata(&pdev->dev, p);
164
165    return 0;
166}
167
168static int __devexit sunfire_led_generic_remove(struct platform_device *pdev)
169{
170    struct sunfire_drvdata *p = dev_get_drvdata(&pdev->dev);
171    int i;
172
173    for (i = 0; i < NUM_LEDS_PER_BOARD; i++)
174        led_classdev_unregister(&p->leds[i].led_cdev);
175
176    return 0;
177}
178
179static struct led_type clockboard_led_types[NUM_LEDS_PER_BOARD] = {
180    {
181        .name = "clockboard-left",
182        .handler = clockboard_left_set,
183    },
184    {
185        .name = "clockboard-middle",
186        .handler = clockboard_middle_set,
187    },
188    {
189        .name = "clockboard-right",
190        .handler = clockboard_right_set,
191        .default_trigger= "heartbeat",
192    },
193};
194
195static int __devinit sunfire_clockboard_led_probe(struct platform_device *pdev)
196{
197    return sunfire_led_generic_probe(pdev, clockboard_led_types);
198}
199
200static struct led_type fhc_led_types[NUM_LEDS_PER_BOARD] = {
201    {
202        .name = "fhc-left",
203        .handler = fhc_left_set,
204    },
205    {
206        .name = "fhc-middle",
207        .handler = fhc_middle_set,
208    },
209    {
210        .name = "fhc-right",
211        .handler = fhc_right_set,
212        .default_trigger= "heartbeat",
213    },
214};
215
216static int __devinit sunfire_fhc_led_probe(struct platform_device *pdev)
217{
218    return sunfire_led_generic_probe(pdev, fhc_led_types);
219}
220
221MODULE_ALIAS("platform:sunfire-clockboard-leds");
222MODULE_ALIAS("platform:sunfire-fhc-leds");
223
224static struct platform_driver sunfire_clockboard_led_driver = {
225    .probe = sunfire_clockboard_led_probe,
226    .remove = __devexit_p(sunfire_led_generic_remove),
227    .driver = {
228        .name = "sunfire-clockboard-leds",
229        .owner = THIS_MODULE,
230    },
231};
232
233static struct platform_driver sunfire_fhc_led_driver = {
234    .probe = sunfire_fhc_led_probe,
235    .remove = __devexit_p(sunfire_led_generic_remove),
236    .driver = {
237        .name = "sunfire-fhc-leds",
238        .owner = THIS_MODULE,
239    },
240};
241
242static int __init sunfire_leds_init(void)
243{
244    int err = platform_driver_register(&sunfire_clockboard_led_driver);
245
246    if (err) {
247        printk(KERN_ERR PFX "Could not register clock board LED driver\n");
248        return err;
249    }
250
251    err = platform_driver_register(&sunfire_fhc_led_driver);
252    if (err) {
253        printk(KERN_ERR PFX "Could not register FHC LED driver\n");
254        platform_driver_unregister(&sunfire_clockboard_led_driver);
255    }
256
257    return err;
258}
259
260static void __exit sunfire_leds_exit(void)
261{
262    platform_driver_unregister(&sunfire_clockboard_led_driver);
263    platform_driver_unregister(&sunfire_fhc_led_driver);
264}
265
266module_init(sunfire_leds_init);
267module_exit(sunfire_leds_exit);
268

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