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		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
165static 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
176static 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
192static int sunfire_clockboard_led_probe(struct platform_device *pdev)
193{
194	return sunfire_led_generic_probe(pdev, clockboard_led_types);
195}
196
197static 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
213static int sunfire_fhc_led_probe(struct platform_device *pdev)
214{
215	return sunfire_led_generic_probe(pdev, fhc_led_types);
216}
217
218MODULE_ALIAS("platform:sunfire-clockboard-leds");
219MODULE_ALIAS("platform:sunfire-fhc-leds");
220
221static 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
229static 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
237static int __init sunfire_leds_init(void)
238{
239	int err = platform_driver_register(&sunfire_clockboard_led_driver);
240
241	if (err) {
242		pr_err("Could not register clock board LED driver\n");
243		return err;
244	}
245
246	err = platform_driver_register(&sunfire_fhc_led_driver);
247	if (err) {
248		pr_err("Could not register FHC LED driver\n");
249		platform_driver_unregister(&sunfire_clockboard_led_driver);
250	}
251
252	return err;
253}
254
255static void __exit sunfire_leds_exit(void)
256{
257	platform_driver_unregister(&sunfire_clockboard_led_driver);
258	platform_driver_unregister(&sunfire_fhc_led_driver);
259}
260
261module_init(sunfire_leds_init);
262module_exit(sunfire_leds_exit);
263