summaryrefslogtreecommitdiffstats
path: root/drivers/leds/leds-ss4200.c
blob: 2bdf6420bdfcd0baa85dfaed88ac40fc0e56312c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
/*
 * SS4200-E Hardware API
 * Copyright (c) 2009, Intel Corporation.
 * Copyright IBM Corporation, 2009
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Author: Dave Hansen <dave@sr71.net>
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/dmi.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/kernel.h>
#include <linux/leds.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/types.h>
#include <linux/uaccess.h>

MODULE_AUTHOR("Rodney Girod <rgirod@confocus.com>, Dave Hansen <dave@sr71.net>");
MODULE_DESCRIPTION("Intel NAS/Home Server ICH7 GPIO Driver");
MODULE_LICENSE("GPL");

/*
 * ICH7 LPC/GPIO PCI Config register offsets
 */
#define PMBASE		0x040
#define GPIO_BASE	0x048
#define GPIO_CTRL	0x04c
#define GPIO_EN		0x010

/*
 * The ICH7 GPIO register block is 64 bytes in size.
 */
#define ICH7_GPIO_SIZE	64

/*
 * Define register offsets within the ICH7 register block.
 */
#define GPIO_USE_SEL	0x000
#define GP_IO_SEL	0x004
#define GP_LVL		0x00c
#define GPO_BLINK	0x018
#define GPI_INV		0x030
#define GPIO_USE_SEL2	0x034
#define GP_IO_SEL2	0x038
#define GP_LVL2		0x03c

/*
 * PCI ID of the Intel ICH7 LPC Device within which the GPIO block lives.
 */
static const struct pci_device_id ich7_lpc_pci_id[] = {
	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_0) },
	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_1) },
	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_30) },
	{ } /* NULL entry */
};

MODULE_DEVICE_TABLE(pci, ich7_lpc_pci_id);

static int __init ss4200_led_dmi_callback(const struct dmi_system_id *id)
{
	pr_info("detected '%s'\n", id->ident);
	return 1;
}

static bool __initdata nodetect;
module_param_named(nodetect, nodetect, bool, 0);
MODULE_PARM_DESC(nodetect, "Skip DMI-based hardware detection");

/*
 * struct nas_led_whitelist - List of known good models
 *
 * Contains the known good models this driver is compatible with.
 * When adding a new model try to be as strict as possible. This
 * makes it possible to keep the false positives (the model is
 * detected as working, but in reality it is not) as low as
 * possible.
 */
static struct dmi_system_id nas_led_whitelist[] __initdata = {
	{
		.callback = ss4200_led_dmi_callback,
		.ident = "Intel SS4200-E",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Intel"),
			DMI_MATCH(DMI_PRODUCT_NAME, "SS4200-E"),
			DMI_MATCH(DMI_PRODUCT_VERSION, "1.00.00")
		}
	},
	{}
};

/*
 * Base I/O address assigned to the Power Management register block
 */
static u32 g_pm_io_base;

/*
 * Base I/O address assigned to the ICH7 GPIO register block
 */
static u32 nas_gpio_io_base;

/*
 * When we successfully register a region, we are returned a resource.
 * We use these to identify which regions we need to release on our way
 * back out.
 */
static struct resource *gp_gpio_resource;

struct nasgpio_led {
	char *name;
	u32 gpio_bit;
	struct led_classdev led_cdev;
};

/*
 * gpio_bit(s) are the ICH7 GPIO bit assignments
 */
static struct nasgpio_led nasgpio_leds[] = {
	{ .name = "hdd1:blue:sata",	.gpio_bit = 0 },
	{ .name = "hdd1:amber:sata",	.gpio_bit = 1 },
	{ .name = "hdd2:blue:sata",	.gpio_bit = 2 },
	{ .name = "hdd2:amber:sata",	.gpio_bit = 3 },
	{ .name = "hdd3:blue:sata",	.gpio_bit = 4 },
	{ .name = "hdd3:amber:sata",	.gpio_bit = 5 },
	{ .name = "hdd4:blue:sata",	.gpio_bit = 6 },
	{ .name = "hdd4:amber:sata",	.gpio_bit = 7 },
	{ .name = "power:blue:power",	.gpio_bit = 27},
	{ .name = "power:amber:power",  .gpio_bit = 28},
};

#define NAS_RECOVERY	0x00000400	/* GPIO10 */

static struct nasgpio_led *
led_classdev_to_nasgpio_led(struct led_classdev *led_cdev)
{
	return container_of(led_cdev, struct nasgpio_led, led_cdev);
}

static struct nasgpio_led *get_led_named(char *name)
{
	int i;
	for (i = 0; i < ARRAY_SIZE(nasgpio_leds); i++) {
		if (strcmp(nasgpio_leds[i].name, name))
			continue;
		return &nasgpio_leds[i];
	}
	return NULL;
}

/*
 * This protects access to the gpio ports.
 */
static DEFINE_SPINLOCK(nasgpio_gpio_lock);

/*
 * There are two gpio ports, one for blinking and the other
 * for power.  @port tells us if we're doing blinking or
 * power control.
 *
 * Caller must hold nasgpio_gpio_lock
 */
static void __nasgpio_led_set_attr(struct led_classdev *led_cdev,
				   u32 port, u32 value)
{
	struct nasgpio_led *led = led_classdev_to_nasgpio_led(led_cdev);
	u32 gpio_out;

	gpio_out = inl(nas_gpio_io_base + port);
	if (value)
		gpio_out |= (1<<led->gpio_bit);
	else
		gpio_out &= ~(1<<led->gpio_bit);

	outl(gpio_out, nas_gpio_io_base + port);
}

static void nasgpio_led_set_attr(struct led_classdev *led_cdev,
				 u32 port, u32 value)
{
	spin_lock(&nasgpio_gpio_lock);
	__nasgpio_led_set_attr(led_cdev, port, value);
	spin_unlock(&nasgpio_gpio_lock);
}

static u32 nasgpio_led_get_attr(struct led_classdev *led_cdev, u32 port)
{
	struct nasgpio_led *led = led_classdev_to_nasgpio_led(led_cdev);
	u32 gpio_in;

	spin_lock(&nasgpio_gpio_lock);
	gpio_in = inl(nas_gpio_io_base + port);
	spin_unlock(&nasgpio_gpio_lock);
	if (gpio_in & (1<<led->gpio_bit))
		return 1;
	return 0;
}

/*
 * There is actual brightness control in the hardware,
 * but it is via smbus commands and not implemented
 * in this driver.
 */
static void nasgpio_led_set_brightness(struct led_classdev *led_cdev,
				       enum led_brightness brightness)
{
	u32 setting = 0;
	if (brightness >= LED_HALF)
		setting = 1;
	/*
	 * Hold the lock across both operations.  This ensures
	 * consistency so that both the "turn off blinking"
	 * and "turn light off" operations complete as a set.
	 */
	spin_lock(&nasgpio_gpio_lock);
	/*
	 * LED class documentation asks that past blink state
	 * be disabled when brightness is turned to zero.
	 */
	if (brightness == 0)
		__nasgpio_led_set_attr(led_cdev, GPO_BLINK, 0);
	__nasgpio_led_set_attr(led_cdev, GP_LVL, setting);
	spin_unlock(&nasgpio_gpio_lock);
}

static int nasgpio_led_set_blink(struct led_classdev *led_cdev,
				 unsigned long *delay_on,
				 unsigned long *delay_off)
{
	u32 setting = 1;
	if (!(*delay_on == 0 && *delay_off == 0) &&
	    !(*delay_on == 500 && *delay_off == 500))
		return -EINVAL;
	/*
	 * These are very approximate.
	 */
	*delay_on = 500;
	*delay_off = 500;

	nasgpio_led_set_attr(led_cdev, GPO_BLINK, setting);

	return 0;
}


/*
 * Initialize the ICH7 GPIO registers for NAS usage.  The BIOS should have
 * already taken care of this, but we will do so in a non destructive manner
 * so that we have what we need whether the BIOS did it or not.
 */
static int ich7_gpio_init(struct device *dev)
{
	int i;
	u32 config_data = 0;
	u32 all_nas_led = 0;

	for (i = 0; i < ARRAY_SIZE(nasgpio_leds); i++)
		all_nas_led |= (1<<nasgpio_leds[i].gpio_bit);

	spin_lock(&nasgpio_gpio_lock);
	/*
	 * We need to enable all of the GPIO lines used by the NAS box,
	 * so we will read the current Use Selection and add our usage
	 * to it.  This should be benign with regard to the original
	 * BIOS configuration.
	 */
	config_data = inl(nas_gpio_io_base + GPIO_USE_SEL);
	dev_dbg(dev, ": Data read from GPIO_USE_SEL = 0x%08x\n", config_data);
	config_data |= all_nas_led + NAS_RECOVERY;
	outl(config_data, nas_gpio_io_base + GPIO_USE_SEL);
	config_data = inl(nas_gpio_io_base + GPIO_USE_SEL);
	dev_dbg(dev, ": GPIO_USE_SEL = 0x%08x\n\n", config_data);

	/*
	 * The LED GPIO outputs need to be configured for output, so we
	 * will ensure that all LED lines are cleared for output and the
	 * RECOVERY line ready for input.  This too should be benign with
	 * regard to BIOS configuration.
	 */
	config_data = inl(nas_gpio_io_base + GP_IO_SEL);
	dev_dbg(dev, ": Data read from GP_IO_SEL = 0x%08x\n",
					config_data);
	config_data &= ~all_nas_led;
	config_data |= NAS_RECOVERY;
	outl(config_data, nas_gpio_io_base + GP_IO_SEL);
	config_data = inl(nas_gpio_io_base + GP_IO_SEL);
	dev_dbg(dev, ": GP_IO_SEL = 0x%08x\n", config_data);

	/*
	 * In our final system, the BIOS will initialize the state of all
	 * of the LEDs.  For now, we turn them all off (or Low).
	 */
	config_data = inl(nas_gpio_io_base + GP_LVL);
	dev_dbg(dev, ": Data read from GP_LVL = 0x%08x\n", config_data);
	/*
	 * In our final system, the BIOS will initialize the blink state of all
	 * of the LEDs.  For now, we turn blink off for all of them.
	 */
	config_data = inl(nas_gpio_io_base + GPO_BLINK);
	dev_dbg(dev, ": Data read from GPO_BLINK = 0x%08x\n", config_data);

	/*
	 * At this moment, I am unsure if anything needs to happen with GPI_INV
	 */
	config_data = inl(nas_gpio_io_base + GPI_INV);
	dev_dbg(dev, ": Data read from GPI_INV = 0x%08x\n", config_data);

	spin_unlock(&nasgpio_gpio_lock);
	return 0;
}

static void ich7_lpc_cleanup(struct device *dev)
{
	/*
	 * If we were given exclusive use of the GPIO
	 * I/O Address range, we must return it.
	 */
	if (gp_gpio_resource) {
		dev_dbg(dev, ": Releasing GPIO I/O addresses\n");
		release_region(nas_gpio_io_base, ICH7_GPIO_SIZE);
		gp_gpio_resource = NULL;
	}
}

/*
 * The OS has determined that the LPC of the Intel ICH7 Southbridge is present
 * so we can retrive the required operational information and prepare the GPIO.
 */
static struct pci_dev *nas_gpio_pci_dev;
static int ich7_lpc_probe(struct pci_dev *dev,
				    const struct pci_device_id *id)
{
	int status;
	u32 gc = 0;

	status = pci_enable_device(dev);
	if (status) {
		dev_err(&dev->dev, "pci_enable_device failed\n");
		return -EIO;
	}

	nas_gpio_pci_dev = dev;
	status = pci_read_config_dword(dev, PMBASE, &g_pm_io_base);
	if (status)
		goto out;
	g_pm_io_base &= 0x00000ff80;

	status = pci_read_config_dword(dev, GPIO_CTRL, &gc);
	if (!(GPIO_EN & gc)) {
		status = -EEXIST;
		dev_info(&dev->dev,
			   "ERROR: The LPC GPIO Block has not been enabled.\n");
		goto out;
	}

	status = pci_read_config_dword(dev, GPIO_BASE, &nas_gpio_io_base);
	if (0 > status) {
		dev_info(&dev->dev, "Unable to read GPIOBASE.\n");
		goto out;
	}
	dev_dbg(&dev->dev, ": GPIOBASE = 0x%08x\n", nas_gpio_io_base);
	nas_gpio_io_base &= 0x00000ffc0;

	/*
	 * Insure that we have exclusive access to the GPIO I/O address range.
	 */
	gp_gpio_resource = request_region(nas_gpio_io_base, ICH7_GPIO_SIZE,
					  KBUILD_MODNAME);
	if (NULL == gp_gpio_resource) {
		dev_info(&dev->dev,
			 "ERROR Unable to register GPIO I/O addresses.\n");
		status = -1;
		goto out;
	}

	/*
	 * Initialize the GPIO for NAS/Home Server Use
	 */
	ich7_gpio_init(&dev->dev);

out:
	if (status) {
		ich7_lpc_cleanup(&dev->dev);
		pci_disable_device(dev);
	}
	return status;
}

static void ich7_lpc_remove(struct pci_dev *dev)
{
	ich7_lpc_cleanup(&dev->dev);
	pci_disable_device(dev);
}

/*
 * pci_driver structure passed to the PCI modules
 */
static struct pci_driver nas_gpio_pci_driver = {
	.name = KBUILD_MODNAME,
	.id_table = ich7_lpc_pci_id,
	.probe = ich7_lpc_probe,
	.remove = ich7_lpc_remove,
};

static struct led_classdev *get_classdev_for_led_nr(int nr)
{
	struct nasgpio_led *nas_led = &nasgpio_leds[nr];
	struct led_classdev *led = &nas_led->led_cdev;
	return led;
}


static void set_power_light_amber_noblink(void)
{
	struct nasgpio_led *amber = get_led_named("power:amber:power");
	struct nasgpio_led *blue = get_led_named("power:blue:power");

	if (!amber || !blue)
		return;
	/*
	 * LED_OFF implies disabling future blinking
	 */
	pr_debug("setting blue off and amber on\n");

	nasgpio_led_set_brightness(&blue->led_cdev, LED_OFF);
	nasgpio_led_set_brightness(&amber->led_cdev, LED_FULL);
}

static ssize_t nas_led_blink_show(struct device *dev,
				  struct device_attribute *attr, char *buf)
{
	struct led_classdev *led = dev_get_drvdata(dev);
	int blinking = 0;
	if (nasgpio_led_get_attr(led, GPO_BLINK))
		blinking = 1;
	return sprintf(buf, "%u\n", blinking);
}

static ssize_t nas_led_blink_store(struct device *dev,
				   struct device_attribute *attr,
				   const char *buf, size_t size)
{
	int ret;
	struct led_classdev *led = dev_get_drvdata(dev);
	unsigned long blink_state;

	ret = kstrtoul(buf, 10, &blink_state);
	if (ret)
		return ret;

	nasgpio_led_set_attr(led, GPO_BLINK, blink_state);

	return size;
}

static DEVICE_ATTR(blink, 0644, nas_led_blink_show, nas_led_blink_store);

static int register_nasgpio_led(int led_nr)
{
	int ret;
	struct nasgpio_led *nas_led = &nasgpio_leds[led_nr];
	struct led_classdev *led = get_classdev_for_led_nr(led_nr);

	led->name = nas_led->name;
	led->brightness = LED_OFF;
	if (nasgpio_led_get_attr(led, GP_LVL))
		led->brightness = LED_FULL;
	led->brightness_set = nasgpio_led_set_brightness;
	led->blink_set = nasgpio_led_set_blink;
	ret = led_classdev_register(&nas_gpio_pci_dev->dev, led);
	if (ret)
		return ret;
	ret = device_create_file(led->dev, &dev_attr_blink);
	if (ret)
		led_classdev_unregister(led);
	return ret;
}

static void unregister_nasgpio_led(int led_nr)
{
	struct led_classdev *led = get_classdev_for_led_nr(led_nr);
	led_classdev_unregister(led);
	device_remove_file(led->dev, &dev_attr_blink);
}
/*
 * module load/initialization
 */
static int __init nas_gpio_init(void)
{
	int i;
	int ret = 0;
	int nr_devices = 0;

	nr_devices = dmi_check_system(nas_led_whitelist);
	if (nodetect) {
		pr_info("skipping hardware autodetection\n");
		pr_info("Please send 'dmidecode' output to dave@sr71.net\n");
		nr_devices++;
	}

	if (nr_devices <= 0) {
		pr_info("no LED devices found\n");
		return -ENODEV;
	}

	pr_info("registering PCI driver\n");
	ret = pci_register_driver(&nas_gpio_pci_driver);
	if (ret)
		return ret;
	for (i = 0; i < ARRAY_SIZE(nasgpio_leds); i++) {
		ret = register_nasgpio_led(i);
		if (ret)
			goto out_err;
	}
	/*
	 * When the system powers on, the BIOS leaves the power
	 * light blue and blinking.  This will turn it solid
	 * amber once the driver is loaded.
	 */
	set_power_light_amber_noblink();
	return 0;
out_err:
	for (i--; i >= 0; i--)
		unregister_nasgpio_led(i);
	pci_unregister_driver(&nas_gpio_pci_driver);
	return ret;
}

/*
 * module unload
 */
static void __exit nas_gpio_exit(void)
{
	int i;
	pr_info("Unregistering driver\n");
	for (i = 0; i < ARRAY_SIZE(nasgpio_leds); i++)
		unregister_nasgpio_led(i);
	pci_unregister_driver(&nas_gpio_pci_driver);
}

module_init(nas_gpio_init);
module_exit(nas_gpio_exit);