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
20MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
21MODULE_DESCRIPTION("Sun Fire LED driver");
22MODULE_LICENSE("GPL");
23
24struct 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
30static 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
54static 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
60static 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
66static 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
72static 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
96static 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
102static 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
108static 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
114typedef void (*set_handler)(struct led_classdev *, enum led_brightness);
115struct led_type {
116	const char	*name;
117	set_handler	handler;
118	const char	*default_trigger;
119};
120
121#define NUM_LEDS_PER_BOARD	3
122struct sunfire_drvdata {
123	struct sunfire_led	leds[NUM_LEDS_PER_BOARD];
124};
125
126static int __devinit 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		err = -EINVAL;
136		goto out;
137	}
138
139	p = kzalloc(sizeof(*p), GFP_KERNEL);
140	if (!p) {
141		printk(KERN_ERR PFX "Could not allocate struct sunfire_drvdata\n");
142		err = -ENOMEM;
143		goto out;
144	}
145
146	for (i = 0; i < NUM_LEDS_PER_BOARD; i++) {
147		struct led_classdev *lp = &p->leds[i].led_cdev;
148
149		p->leds[i].reg = (void __iomem *) pdev->resource[0].start;
150		lp->name = types[i].name;
151		lp->brightness = LED_FULL;
152		lp->brightness_set = types[i].handler;
153		lp->default_trigger = types[i].default_trigger;
154
155		err = led_classdev_register(&pdev->dev, lp);
156		if (err) {
157			printk(KERN_ERR PFX "Could not register %s LED\n",
158			       lp->name);
159			goto out_unregister_led_cdevs;
160		}
161	}
162
163	dev_set_drvdata(&pdev->dev, p);
164
165	return 0;
166
167out_unregister_led_cdevs:
168	for (i--; i >= 0; i--)
169		led_classdev_unregister(&p->leds[i].led_cdev);
170	kfree(p);
171out:
172	return err;
173}
174
175static int __devexit sunfire_led_generic_remove(struct platform_device *pdev)
176{
177	struct sunfire_drvdata *p = dev_get_drvdata(&pdev->dev);
178	int i;
179
180	for (i = 0; i < NUM_LEDS_PER_BOARD; i++)
181		led_classdev_unregister(&p->leds[i].led_cdev);
182
183	kfree(p);
184
185	return 0;
186}
187
188static struct led_type clockboard_led_types[NUM_LEDS_PER_BOARD] = {
189	{
190		.name		= "clockboard-left",
191		.handler	= clockboard_left_set,
192	},
193	{
194		.name		= "clockboard-middle",
195		.handler	= clockboard_middle_set,
196	},
197	{
198		.name		= "clockboard-right",
199		.handler	= clockboard_right_set,
200		.default_trigger= "heartbeat",
201	},
202};
203
204static int __devinit sunfire_clockboard_led_probe(struct platform_device *pdev)
205{
206	return sunfire_led_generic_probe(pdev, clockboard_led_types);
207}
208
209static struct led_type fhc_led_types[NUM_LEDS_PER_BOARD] = {
210	{
211		.name		= "fhc-left",
212		.handler	= fhc_left_set,
213	},
214	{
215		.name		= "fhc-middle",
216		.handler	= fhc_middle_set,
217	},
218	{
219		.name		= "fhc-right",
220		.handler	= fhc_right_set,
221		.default_trigger= "heartbeat",
222	},
223};
224
225static int __devinit sunfire_fhc_led_probe(struct platform_device *pdev)
226{
227	return sunfire_led_generic_probe(pdev, fhc_led_types);
228}
229
230MODULE_ALIAS("platform:sunfire-clockboard-leds");
231MODULE_ALIAS("platform:sunfire-fhc-leds");
232
233static struct platform_driver sunfire_clockboard_led_driver = {
234	.probe		= sunfire_clockboard_led_probe,
235	.remove		= __devexit_p(sunfire_led_generic_remove),
236	.driver		= {
237		.name	= "sunfire-clockboard-leds",
238		.owner	= THIS_MODULE,
239	},
240};
241
242static struct platform_driver sunfire_fhc_led_driver = {
243	.probe		= sunfire_fhc_led_probe,
244	.remove		= __devexit_p(sunfire_led_generic_remove),
245	.driver		= {
246		.name	= "sunfire-fhc-leds",
247		.owner	= THIS_MODULE,
248	},
249};
250
251static int __init sunfire_leds_init(void)
252{
253	int err = platform_driver_register(&sunfire_clockboard_led_driver);
254
255	if (err) {
256		printk(KERN_ERR PFX "Could not register clock board LED driver\n");
257		return err;
258	}
259
260	err = platform_driver_register(&sunfire_fhc_led_driver);
261	if (err) {
262		printk(KERN_ERR PFX "Could not register FHC LED driver\n");
263		platform_driver_unregister(&sunfire_clockboard_led_driver);
264	}
265
266	return err;
267}
268
269static void __exit sunfire_leds_exit(void)
270{
271	platform_driver_unregister(&sunfire_clockboard_led_driver);
272	platform_driver_unregister(&sunfire_fhc_led_driver);
273}
274
275module_init(sunfire_leds_init);
276module_exit(sunfire_leds_exit);
277