xref: /openbmc/linux/drivers/leds/leds-sunfire.c (revision 23c2b932) 
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);
254