xref: /openbmc/linux/drivers/leds/leds-sunfire.c (revision d0b73b48) 
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 
20 MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
21 MODULE_DESCRIPTION("Sun Fire LED driver");
22 MODULE_LICENSE("GPL");
23 
24 struct 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 
30 static 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 
54 static 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 
60 static 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 
66 static 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 
72 static 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 
96 static 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 
102 static 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 
108 static 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 
114 typedef void (*set_handler)(struct led_classdev *, enum led_brightness);
115 struct led_type {
116 	const char	*name;
117 	set_handler	handler;
118 	const char	*default_trigger;
119 };
120 
121 #define NUM_LEDS_PER_BOARD	3
122 struct sunfire_drvdata {
123 	struct sunfire_led	leds[NUM_LEDS_PER_BOARD];
124 };
125 
126 static int 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 
168 static int 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 
179 static 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 
195 static int sunfire_clockboard_led_probe(struct platform_device *pdev)
196 {
197 	return sunfire_led_generic_probe(pdev, clockboard_led_types);
198 }
199 
200 static 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 
216 static int sunfire_fhc_led_probe(struct platform_device *pdev)
217 {
218 	return sunfire_led_generic_probe(pdev, fhc_led_types);
219 }
220 
221 MODULE_ALIAS("platform:sunfire-clockboard-leds");
222 MODULE_ALIAS("platform:sunfire-fhc-leds");
223 
224 static struct platform_driver sunfire_clockboard_led_driver = {
225 	.probe		= sunfire_clockboard_led_probe,
226 	.remove		= sunfire_led_generic_remove,
227 	.driver		= {
228 		.name	= "sunfire-clockboard-leds",
229 		.owner	= THIS_MODULE,
230 	},
231 };
232 
233 static struct platform_driver sunfire_fhc_led_driver = {
234 	.probe		= sunfire_fhc_led_probe,
235 	.remove		= sunfire_led_generic_remove,
236 	.driver		= {
237 		.name	= "sunfire-fhc-leds",
238 		.owner	= THIS_MODULE,
239 	},
240 };
241 
242 static 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 
260 static 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 
266 module_init(sunfire_leds_init);
267 module_exit(sunfire_leds_exit);
268