xref: /openbmc/linux/drivers/leds/leds-sunfire.c (revision fb574682) 
1 // SPDX-License-Identifier: GPL-2.0-only
2 /* leds-sunfire.c: SUNW,Ultra-Enterprise LED driver.
3  *
4  * Copyright (C) 2008 David S. Miller <davem@davemloft.net>
5  */
6 
7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
8 
9 #include <linux/kernel.h>
10 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/leds.h>
13 #include <linux/io.h>
14 #include <linux/platform_device.h>
15 #include <linux/slab.h>
16 
17 #include <asm/fhc.h>
18 #include <asm/upa.h>
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 		dev_err(&pdev->dev, "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 		return -ENOMEM;
141 
142 	for (i = 0; i < NUM_LEDS_PER_BOARD; i++) {
143 		struct led_classdev *lp = &p->leds[i].led_cdev;
144 
145 		p->leds[i].reg = (void __iomem *) pdev->resource[0].start;
146 		lp->name = types[i].name;
147 		lp->brightness = LED_FULL;
148 		lp->brightness_set = types[i].handler;
149 		lp->default_trigger = types[i].default_trigger;
150 
151 		err = led_classdev_register(&pdev->dev, lp);
152 		if (err) {
153 			dev_err(&pdev->dev, "Could not register %s LED\n",
154 			       lp->name);
155 			for (i--; i >= 0; i--)
156 				led_classdev_unregister(&p->leds[i].led_cdev);
157 			return err;
158 		}
159 	}
160 
161 	platform_set_drvdata(pdev, p);
162 
163 	return 0;
164 }
165 
166 static int sunfire_led_generic_remove(struct platform_device *pdev)
167 {
168 	struct sunfire_drvdata *p = platform_get_drvdata(pdev);
169 	int i;
170 
171 	for (i = 0; i < NUM_LEDS_PER_BOARD; i++)
172 		led_classdev_unregister(&p->leds[i].led_cdev);
173 
174 	return 0;
175 }
176 
177 static struct led_type clockboard_led_types[NUM_LEDS_PER_BOARD] = {
178 	{
179 		.name		= "clockboard-left",
180 		.handler	= clockboard_left_set,
181 	},
182 	{
183 		.name		= "clockboard-middle",
184 		.handler	= clockboard_middle_set,
185 	},
186 	{
187 		.name		= "clockboard-right",
188 		.handler	= clockboard_right_set,
189 		.default_trigger = "heartbeat",
190 	},
191 };
192 
193 static int sunfire_clockboard_led_probe(struct platform_device *pdev)
194 {
195 	return sunfire_led_generic_probe(pdev, clockboard_led_types);
196 }
197 
198 static struct led_type fhc_led_types[NUM_LEDS_PER_BOARD] = {
199 	{
200 		.name		= "fhc-left",
201 		.handler	= fhc_left_set,
202 	},
203 	{
204 		.name		= "fhc-middle",
205 		.handler	= fhc_middle_set,
206 	},
207 	{
208 		.name		= "fhc-right",
209 		.handler	= fhc_right_set,
210 		.default_trigger = "heartbeat",
211 	},
212 };
213 
214 static int sunfire_fhc_led_probe(struct platform_device *pdev)
215 {
216 	return sunfire_led_generic_probe(pdev, fhc_led_types);
217 }
218 
219 MODULE_ALIAS("platform:sunfire-clockboard-leds");
220 MODULE_ALIAS("platform:sunfire-fhc-leds");
221 
222 static struct platform_driver sunfire_clockboard_led_driver = {
223 	.probe		= sunfire_clockboard_led_probe,
224 	.remove		= sunfire_led_generic_remove,
225 	.driver		= {
226 		.name	= "sunfire-clockboard-leds",
227 	},
228 };
229 
230 static struct platform_driver sunfire_fhc_led_driver = {
231 	.probe		= sunfire_fhc_led_probe,
232 	.remove		= sunfire_led_generic_remove,
233 	.driver		= {
234 		.name	= "sunfire-fhc-leds",
235 	},
236 };
237 
238 static struct platform_driver * const drivers[] = {
239 	&sunfire_clockboard_led_driver,
240 	&sunfire_fhc_led_driver,
241 };
242 
243 static int __init sunfire_leds_init(void)
244 {
245 	return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
246 }
247 
248 static void __exit sunfire_leds_exit(void)
249 {
250 	platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
251 }
252 
253 module_init(sunfire_leds_init);
254 module_exit(sunfire_leds_exit);
255