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#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
19MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
20MODULE_DESCRIPTION("Sun Fire LED driver");
21MODULE_LICENSE("GPL");
22
23struct 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
29static 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
53static 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
59static 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
65static 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
71static 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
95static 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
101static 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
107static 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
113typedef void (*set_handler)(struct led_classdev *, enum led_brightness);
114struct led_type {
115    const char *name;
116    set_handler handler;
117    const char *default_trigger;
118};
119
120#define NUM_LEDS_PER_BOARD 3
121struct sunfire_drvdata {
122    struct sunfire_led leds[NUM_LEDS_PER_BOARD];
123};
124
125static 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    dev_set_drvdata(&pdev->dev, p);
163
164    return 0;
165}
166
167static int sunfire_led_generic_remove(struct platform_device *pdev)
168{
169    struct sunfire_drvdata *p = dev_get_drvdata(&pdev->dev);
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
178static 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
194static int sunfire_clockboard_led_probe(struct platform_device *pdev)
195{
196    return sunfire_led_generic_probe(pdev, clockboard_led_types);
197}
198
199static 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
215static int sunfire_fhc_led_probe(struct platform_device *pdev)
216{
217    return sunfire_led_generic_probe(pdev, fhc_led_types);
218}
219
220MODULE_ALIAS("platform:sunfire-clockboard-leds");
221MODULE_ALIAS("platform:sunfire-fhc-leds");
222
223static 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
232static 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
241static 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
259static 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
265module_init(sunfire_leds_init);
266module_exit(sunfire_leds_exit);
267

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