aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/leds/leds-mlxcpld.c
blob: f4721f8065f0fa54fc844343ae95a70b2e3e3222 (plain) (blame)
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
/*
 * drivers/leds/leds-mlxcpld.c
 * Copyright (c) 2016 Mellanox Technologies. All rights reserved.
 * Copyright (c) 2016 Vadim Pasternak <vadimp@mellanox.com>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the names of the copyright holders nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <linux/acpi.h>
#include <linux/device.h>
#include <linux/dmi.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/io.h>
#include <linux/leds.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/platform_device.h>
#include <linux/slab.h>

#define MLXPLAT_CPLD_LPC_REG_BASE_ADRR     0x2500 /* LPC bus access */

/* Color codes for LEDs */
#define MLXCPLD_LED_OFFSET_HALF		0x01 /* Offset from solid: 3Hz blink */
#define MLXCPLD_LED_OFFSET_FULL		0x02 /* Offset from solid: 6Hz blink */
#define MLXCPLD_LED_IS_OFF		0x00 /* Off */
#define MLXCPLD_LED_RED_STATIC_ON	0x05 /* Solid red */
#define MLXCPLD_LED_RED_BLINK_HALF	(MLXCPLD_LED_RED_STATIC_ON + \
					 MLXCPLD_LED_OFFSET_HALF)
#define MLXCPLD_LED_RED_BLINK_FULL	(MLXCPLD_LED_RED_STATIC_ON + \
					 MLXCPLD_LED_OFFSET_FULL)
#define MLXCPLD_LED_GREEN_STATIC_ON	0x0D /* Solid green */
#define MLXCPLD_LED_GREEN_BLINK_HALF	(MLXCPLD_LED_GREEN_STATIC_ON + \
					 MLXCPLD_LED_OFFSET_HALF)
#define MLXCPLD_LED_GREEN_BLINK_FULL	(MLXCPLD_LED_GREEN_STATIC_ON + \
					 MLXCPLD_LED_OFFSET_FULL)
#define MLXCPLD_LED_BLINK_3HZ		167 /* ~167 msec off/on */
#define MLXCPLD_LED_BLINK_6HZ		83 /* ~83 msec off/on */

/**
 * mlxcpld_param - LED access parameters:
 * @offset - offset for LED access in CPLD device
 * @mask - mask for LED access in CPLD device
 * @base_color - base color code for LED
**/
struct mlxcpld_param {
	u8 offset;
	u8 mask;
	u8 base_color;
};

/**
 * mlxcpld_led_priv - LED private data:
 * @cled - LED class device instance
 * @param - LED CPLD access parameters
**/
struct mlxcpld_led_priv {
	struct led_classdev cdev;
	struct mlxcpld_param param;
};

#define cdev_to_priv(c)		container_of(c, struct mlxcpld_led_priv, cdev)

/**
 * mlxcpld_led_profile - system LED profile (defined per system class):
 * @offset - offset for LED access in CPLD device
 * @mask - mask for LED access in CPLD device
 * @base_color - base color code
 * @brightness - default brightness setting (on/off)
 * @name - LED name
**/
struct mlxcpld_led_profile {
	u8 offset;
	u8 mask;
	u8 base_color;
	enum led_brightness brightness;
	const char *name;
};

/**
 * mlxcpld_led_pdata - system LED private data
 * @pdev - platform device pointer
 * @pled - LED class device instance
 * @profile - system configuration profile
 * @num_led_instances - number of LED instances
 * @lock - device access lock
**/
struct mlxcpld_led_pdata {
	struct platform_device *pdev;
	struct mlxcpld_led_priv *pled;
	struct mlxcpld_led_profile *profile;
	int num_led_instances;
	spinlock_t lock;
};

static struct mlxcpld_led_pdata *mlxcpld_led;

/* Default profile fit the next Mellanox systems:
 * "msx6710", "msx6720", "msb7700", "msn2700", "msx1410",
 * "msn2410", "msb7800", "msn2740"
 */
static struct mlxcpld_led_profile mlxcpld_led_default_profile[] = {
	{
		0x21, 0xf0, MLXCPLD_LED_GREEN_STATIC_ON, 1,
		"mlxcpld:fan1:green",
	},
	{
		0x21, 0xf0, MLXCPLD_LED_RED_STATIC_ON, LED_OFF,
		"mlxcpld:fan1:red",
	},
	{
		0x21, 0x0f, MLXCPLD_LED_GREEN_STATIC_ON, 1,
		"mlxcpld:fan2:green",
	},
	{
		0x21, 0x0f, MLXCPLD_LED_RED_STATIC_ON, LED_OFF,
		"mlxcpld:fan2:red",
	},
	{
		0x22, 0xf0, MLXCPLD_LED_GREEN_STATIC_ON, 1,
		"mlxcpld:fan3:green",
	},
	{
		0x22, 0xf0, MLXCPLD_LED_RED_STATIC_ON, LED_OFF,
		"mlxcpld:fan3:red",
	},
	{
		0x22, 0x0f, MLXCPLD_LED_GREEN_STATIC_ON, 1,
		"mlxcpld:fan4:green",
	},
	{
		0x22, 0x0f, MLXCPLD_LED_RED_STATIC_ON, LED_OFF,
		"mlxcpld:fan4:red",
	},
	{
		0x20, 0x0f, MLXCPLD_LED_GREEN_STATIC_ON, 1,
		"mlxcpld:psu:green",
	},
	{
		0x20, 0x0f, MLXCPLD_LED_RED_STATIC_ON, LED_OFF,
		"mlxcpld:psu:red",
	},
	{
		0x20, 0xf0, MLXCPLD_LED_GREEN_STATIC_ON, 1,
		"mlxcpld:status:green",
	},
	{
		0x20, 0xf0, MLXCPLD_LED_RED_STATIC_ON, LED_OFF,
		"mlxcpld:status:red",
	},
};

/* Profile fit the Mellanox systems based on "msn2100" */
static struct mlxcpld_led_profile mlxcpld_led_msn2100_profile[] = {
	{
		0x21, 0xf0, MLXCPLD_LED_GREEN_STATIC_ON, 1,
		"mlxcpld:fan:green",
	},
	{
		0x21, 0xf0, MLXCPLD_LED_RED_STATIC_ON, LED_OFF,
		"mlxcpld:fan:red",
	},
	{
		0x23, 0xf0, MLXCPLD_LED_GREEN_STATIC_ON, 1,
		"mlxcpld:psu1:green",
	},
	{
		0x23, 0xf0, MLXCPLD_LED_RED_STATIC_ON, LED_OFF,
		"mlxcpld:psu1:red",
	},
	{
		0x23, 0x0f, MLXCPLD_LED_GREEN_STATIC_ON, 1,
		"mlxcpld:psu2:green",
	},
	{
		0x23, 0x0f, MLXCPLD_LED_RED_STATIC_ON, LED_OFF,
		"mlxcpld:psu2:red",
	},
	{
		0x20, 0xf0, MLXCPLD_LED_GREEN_STATIC_ON, 1,
		"mlxcpld:status:green",
	},
	{
		0x20, 0xf0, MLXCPLD_LED_RED_STATIC_ON, LED_OFF,
		"mlxcpld:status:red",
	},
	{
		0x24, 0xf0, MLXCPLD_LED_GREEN_STATIC_ON, LED_OFF,
		"mlxcpld:uid:blue",
	},
};

enum mlxcpld_led_platform_types {
	MLXCPLD_LED_PLATFORM_DEFAULT,
	MLXCPLD_LED_PLATFORM_MSN2100,
};

static const char *mlx_product_names[] = {
	"DEFAULT",
	"MSN2100",
};

static enum
mlxcpld_led_platform_types mlxcpld_led_platform_check_sys_type(void)
{
	const char *mlx_product_name;
	int i;

	mlx_product_name = dmi_get_system_info(DMI_PRODUCT_NAME);
	if (!mlx_product_name)
		return MLXCPLD_LED_PLATFORM_DEFAULT;

	for (i = 1;  i < ARRAY_SIZE(mlx_product_names); i++) {
		if (strstr(mlx_product_name, mlx_product_names[i]))
			return i;
	}

	return MLXCPLD_LED_PLATFORM_DEFAULT;
}

static void mlxcpld_led_bus_access_func(u16 base, u8 offset, u8 rw_flag,
					u8 *data)
{
	u32 addr = base + offset;

	if (rw_flag == 0)
		outb(*data, addr);
	else
		*data = inb(addr);
}

static void mlxcpld_led_store_hw(u8 mask, u8 off, u8 vset)
{
	u8 nib, val;

	/*
	 * Each LED is controlled through low or high nibble of the relevant
	 * CPLD register. Register offset is specified by off parameter.
	 * Parameter vset provides color code: 0x0 for off, 0x5 for solid red,
	 * 0x6 for 3Hz blink red, 0xd for solid green, 0xe for 3Hz blink
	 * green.
	 * Parameter mask specifies which nibble is used for specific LED: mask
	 * 0xf0 - lower nibble is to be used (bits from 0 to 3), mask 0x0f -
	 * higher nibble (bits from 4 to 7).
	 */
	spin_lock(&mlxcpld_led->lock);
	mlxcpld_led_bus_access_func(MLXPLAT_CPLD_LPC_REG_BASE_ADRR, off, 1,
				    &val);
	nib = (mask == 0xf0) ? vset : (vset << 4);
	val = (val & mask) | nib;
	mlxcpld_led_bus_access_func(MLXPLAT_CPLD_LPC_REG_BASE_ADRR, off, 0,
				    &val);
	spin_unlock(&mlxcpld_led->lock);
}

static void mlxcpld_led_brightness_set(struct led_classdev *led,
				       enum led_brightness value)
{
	struct mlxcpld_led_priv *pled = cdev_to_priv(led);

	if (value) {
		mlxcpld_led_store_hw(pled->param.mask, pled->param.offset,
				     pled->param.base_color);
		return;
	}

	mlxcpld_led_store_hw(pled->param.mask, pled->param.offset,
			     MLXCPLD_LED_IS_OFF);
}

static int mlxcpld_led_blink_set(struct led_classdev *led,
				 unsigned long *delay_on,
				 unsigned long *delay_off)
{
	struct mlxcpld_led_priv *pled = cdev_to_priv(led);

	/*
	 * HW supports two types of blinking: full (6Hz) and half (3Hz).
	 * For delay on/off zero default setting 3Hz is used.
	 */
	if (!(*delay_on == 0 && *delay_off == 0) &&
	    !(*delay_on == MLXCPLD_LED_BLINK_3HZ &&
	      *delay_off == MLXCPLD_LED_BLINK_3HZ) &&
	    !(*delay_on == MLXCPLD_LED_BLINK_6HZ &&
	      *delay_off == MLXCPLD_LED_BLINK_6HZ))
		return -EINVAL;

	if (*delay_on == MLXCPLD_LED_BLINK_6HZ)
		mlxcpld_led_store_hw(pled->param.mask, pled->param.offset,
				     pled->param.base_color +
				     MLXCPLD_LED_OFFSET_FULL);
	else
		mlxcpld_led_store_hw(pled->param.mask, pled->param.offset,
				     pled->param.base_color +
				     MLXCPLD_LED_OFFSET_HALF);

	return 0;
}

static int mlxcpld_led_config(struct device *dev,
			      struct mlxcpld_led_pdata *cpld)
{
	int i;
	int err;

	cpld->pled = devm_kcalloc(dev,
				  cpld->num_led_instances,
				  sizeof(struct mlxcpld_led_priv),
				  GFP_KERNEL);
	if (!cpld->pled)
		return -ENOMEM;

	for (i = 0; i < cpld->num_led_instances; i++) {
		cpld->pled[i].cdev.name = cpld->profile[i].name;
		cpld->pled[i].cdev.brightness = cpld->profile[i].brightness;
		cpld->pled[i].cdev.max_brightness = 1;
		cpld->pled[i].cdev.brightness_set = mlxcpld_led_brightness_set;
		cpld->pled[i].cdev.blink_set = mlxcpld_led_blink_set;
		cpld->pled[i].cdev.flags = LED_CORE_SUSPENDRESUME;
		err = devm_led_classdev_register(dev, &cpld->pled[i].cdev);
		if (err)
			return err;

		cpld->pled[i].param.offset = mlxcpld_led->profile[i].offset;
		cpld->pled[i].param.mask = mlxcpld_led->profile[i].mask;
		cpld->pled[i].param.base_color =
					mlxcpld_led->profile[i].base_color;

		if (mlxcpld_led->profile[i].brightness)
			mlxcpld_led_brightness_set(&cpld->pled[i].cdev,
					mlxcpld_led->profile[i].brightness);
	}

	return 0;
}

static int __init mlxcpld_led_probe(struct platform_device *pdev)
{
	enum mlxcpld_led_platform_types mlxcpld_led_plat =
					mlxcpld_led_platform_check_sys_type();

	mlxcpld_led = devm_kzalloc(&pdev->dev, sizeof(*mlxcpld_led),
				   GFP_KERNEL);
	if (!mlxcpld_led)
		return -ENOMEM;

	mlxcpld_led->pdev = pdev;

	switch (mlxcpld_led_plat) {
	case MLXCPLD_LED_PLATFORM_MSN2100:
		mlxcpld_led->profile = mlxcpld_led_msn2100_profile;
		mlxcpld_led->num_led_instances =
				ARRAY_SIZE(mlxcpld_led_msn2100_profile);
		break;

	default:
		mlxcpld_led->profile = mlxcpld_led_default_profile;
		mlxcpld_led->num_led_instances =
				ARRAY_SIZE(mlxcpld_led_default_profile);
		break;
	}

	spin_lock_init(&mlxcpld_led->lock);

	return mlxcpld_led_config(&pdev->dev, mlxcpld_led);
}

static struct platform_driver mlxcpld_led_driver = {
	.driver = {
		.name	= KBUILD_MODNAME,
	},
};

static int __init mlxcpld_led_init(void)
{
	struct platform_device *pdev;
	int err;

	if (!dmi_match(DMI_CHASSIS_VENDOR, "Mellanox Technologies Ltd."))
		return -ENODEV;

	pdev = platform_device_register_simple(KBUILD_MODNAME, -1, NULL, 0);
	if (IS_ERR(pdev)) {
		pr_err("Device allocation failed\n");
		return PTR_ERR(pdev);
	}

	err = platform_driver_probe(&mlxcpld_led_driver, mlxcpld_led_probe);
	if (err) {
		pr_err("Probe platform driver failed\n");
		platform_device_unregister(pdev);
	}

	return err;
}

static void __exit mlxcpld_led_exit(void)
{
	platform_device_unregister(mlxcpld_led->pdev);
	platform_driver_unregister(&mlxcpld_led_driver);
}

module_init(mlxcpld_led_init);
module_exit(mlxcpld_led_exit);

MODULE_AUTHOR("Vadim Pasternak <vadimp@mellanox.com>");
MODULE_DESCRIPTION("Mellanox board LED driver");
MODULE_LICENSE("Dual BSD/GPL");
MODULE_ALIAS("platform:leds_mlxcpld");