[mirror_ubuntu-artful-kernel.git] / drivers / hid / hid-gt683r.c

/*
 * MSI GT683R led driver
 *
 * Copyright (c) 2014 Janne Kanniainen <janne.kanniainen@gmail.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that 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.
 *
 */

#include <linux/device.h>
#include <linux/hid.h>
#include <linux/kernel.h>
#include <linux/leds.h>
#include <linux/module.h>

#include "hid-ids.h"

#define GT683R_BUFFER_SIZE			8

/*
 * GT683R_LED_OFF: all LEDs are off
 * GT683R_LED_AUDIO: LEDs brightness depends on sound level
 * GT683R_LED_BREATHING: LEDs brightness varies at human breathing rate
 * GT683R_LED_NORMAL: LEDs are fully on when enabled
 */
enum gt683r_led_mode {
	GT683R_LED_OFF = 0,
	GT683R_LED_AUDIO = 2,
	GT683R_LED_BREATHING = 3,
	GT683R_LED_NORMAL = 5
};

enum gt683r_panels {
	GT683R_LED_BACK = 0,
	GT683R_LED_SIDE = 1,
	GT683R_LED_FRONT = 2,
	GT683R_LED_COUNT,
};

static const char * const gt683r_panel_names[] = {
	"back",
	"side",
	"front",
};

struct gt683r_led {
	struct hid_device *hdev;
	struct led_classdev led_devs[GT683R_LED_COUNT];
	struct mutex lock;
	struct work_struct work;
	enum led_brightness brightnesses[GT683R_LED_COUNT];
	enum gt683r_led_mode mode;
};

static const struct hid_device_id gt683r_led_id[] = {
	{ HID_USB_DEVICE(USB_VENDOR_ID_MSI, USB_DEVICE_ID_MSI_GT683R_LED_PANEL) },
	{ }
};

static void gt683r_brightness_set(struct led_classdev *led_cdev,
				enum led_brightness brightness)
{
	int i;
	struct device *dev = led_cdev->dev->parent;
	struct hid_device *hdev = to_hid_device(dev);
	struct gt683r_led *led = hid_get_drvdata(hdev);

	for (i = 0; i < GT683R_LED_COUNT; i++) {
		if (led_cdev == &led->led_devs[i])
			break;
	}

	if (i < GT683R_LED_COUNT) {
		led->brightnesses[i] = brightness;
		schedule_work(&led->work);
	}
}

static ssize_t mode_show(struct device *dev,
				struct device_attribute *attr,
				char *buf)
{
	u8 sysfs_mode;
	struct hid_device *hdev = to_hid_device(dev->parent);
	struct gt683r_led *led = hid_get_drvdata(hdev);

	if (led->mode == GT683R_LED_NORMAL)
		sysfs_mode = 0;
	else if (led->mode == GT683R_LED_AUDIO)
		sysfs_mode = 1;
	else
		sysfs_mode = 2;

	return scnprintf(buf, PAGE_SIZE, "%u\n", sysfs_mode);
}

static ssize_t mode_store(struct device *dev,
				struct device_attribute *attr,
				const char *buf, size_t count)
{
	u8 sysfs_mode;
	struct hid_device *hdev = to_hid_device(dev->parent);
	struct gt683r_led *led = hid_get_drvdata(hdev);


	if (kstrtou8(buf, 10, &sysfs_mode) || sysfs_mode > 2)
		return -EINVAL;

	mutex_lock(&led->lock);

	if (sysfs_mode == 0)
		led->mode = GT683R_LED_NORMAL;
	else if (sysfs_mode == 1)
		led->mode = GT683R_LED_AUDIO;
	else
		led->mode = GT683R_LED_BREATHING;

	mutex_unlock(&led->lock);
	schedule_work(&led->work);

	return count;
}

static int gt683r_led_snd_msg(struct gt683r_led *led, u8 *msg)
{
	int ret;

	ret = hid_hw_raw_request(led->hdev, msg[0], msg, GT683R_BUFFER_SIZE,
				HID_FEATURE_REPORT, HID_REQ_SET_REPORT);
	if (ret != GT683R_BUFFER_SIZE) {
		hid_err(led->hdev,
			"failed to send set report request: %i\n", ret);
		if (ret < 0)
			return ret;
		return -EIO;
	}

	return 0;
}

static int gt683r_leds_set(struct gt683r_led *led, u8 leds)
{
	int ret;
	u8 *buffer;

	buffer = kzalloc(GT683R_BUFFER_SIZE, GFP_KERNEL);
	if (!buffer)
		return -ENOMEM;

	buffer[0] = 0x01;
	buffer[1] = 0x02;
	buffer[2] = 0x30;
	buffer[3] = leds;
	ret = gt683r_led_snd_msg(led, buffer);

	kfree(buffer);
	return ret;
}

static int gt683r_mode_set(struct gt683r_led *led, u8 mode)
{
	int ret;
	u8 *buffer;

	buffer = kzalloc(GT683R_BUFFER_SIZE, GFP_KERNEL);
	if (!buffer)
		return -ENOMEM;

	buffer[0] = 0x01;
	buffer[1] = 0x02;
	buffer[2] = 0x20;
	buffer[3] = mode;
	buffer[4] = 0x01;
	ret = gt683r_led_snd_msg(led, buffer);

	kfree(buffer);
	return ret;
}

static void gt683r_led_work(struct work_struct *work)
{
	int i;
	u8 leds = 0;
	u8 mode;
	struct gt683r_led *led = container_of(work, struct gt683r_led, work);

	mutex_lock(&led->lock);

	for (i = 0; i < GT683R_LED_COUNT; i++) {
		if (led->brightnesses[i])
			leds |= BIT(i);
	}

	if (gt683r_leds_set(led, leds))
		goto fail;

	if (leds)
		mode = led->mode;
	else
		mode = GT683R_LED_OFF;

	gt683r_mode_set(led, mode);
fail:
	mutex_unlock(&led->lock);
}

static DEVICE_ATTR_RW(mode);

static struct attribute *gt683r_led_attrs[] = {
	&dev_attr_mode.attr,
	NULL
};

static const struct attribute_group gt683r_led_group = {
	.name = "gt683r",
	.attrs = gt683r_led_attrs,
};

static const struct attribute_group *gt683r_led_groups[] = {
	&gt683r_led_group,
	NULL
};

static int gt683r_led_probe(struct hid_device *hdev,
			const struct hid_device_id *id)
{
	int i;
	int ret;
	int name_sz;
	char *name;
	struct gt683r_led *led;

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

	mutex_init(&led->lock);
	INIT_WORK(&led->work, gt683r_led_work);

	led->mode = GT683R_LED_NORMAL;
	led->hdev = hdev;
	hid_set_drvdata(hdev, led);

	ret = hid_parse(hdev);
	if (ret) {
		hid_err(hdev, "hid parsing failed\n");
		return ret;
	}

	ret = hid_hw_start(hdev, HID_CONNECT_HIDRAW);
	if (ret) {
		hid_err(hdev, "hw start failed\n");
		return ret;
	}

	for (i = 0; i < GT683R_LED_COUNT; i++) {
		name_sz = strlen(dev_name(&hdev->dev)) +
				strlen(gt683r_panel_names[i]) + 3;

		name = devm_kzalloc(&hdev->dev, name_sz, GFP_KERNEL);
		if (!name) {
			ret = -ENOMEM;
			goto fail;
		}

		snprintf(name, name_sz, "%s::%s",
				dev_name(&hdev->dev), gt683r_panel_names[i]);
		led->led_devs[i].name = name;
		led->led_devs[i].max_brightness = 1;
		led->led_devs[i].brightness_set = gt683r_brightness_set;
		led->led_devs[i].groups = gt683r_led_groups;

		ret = led_classdev_register(&hdev->dev, &led->led_devs[i]);
		if (ret) {
			hid_err(hdev, "could not register led device\n");
			goto fail;
		}
	}

	return 0;

fail:
	for (i = i - 1; i >= 0; i--)
		led_classdev_unregister(&led->led_devs[i]);
	hid_hw_stop(hdev);
	return ret;
}

static void gt683r_led_remove(struct hid_device *hdev)
{
	int i;
	struct gt683r_led *led = hid_get_drvdata(hdev);

	for (i = 0; i < GT683R_LED_COUNT; i++)
		led_classdev_unregister(&led->led_devs[i]);
	flush_work(&led->work);
	hid_hw_stop(hdev);
}

static struct hid_driver gt683r_led_driver = {
	.probe = gt683r_led_probe,
	.remove = gt683r_led_remove,
	.name = "gt683r_led",
	.id_table = gt683r_led_id,
};

module_hid_driver(gt683r_led_driver);

MODULE_AUTHOR("Janne Kanniainen");
MODULE_DESCRIPTION("MSI GT683R led driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
f471d948 JK	1	/*
	2	* MSI GT683R led driver
	3	*
	4	* Copyright (c) 2014 Janne Kanniainen <janne.kanniainen@gmail.com>
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License as
	8	* published by the Free Software Foundation; either version 2 of
	9	* the License, or (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	*/
	17
	18	#include <linux/device.h>
	19	#include <linux/hid.h>
	20	#include <linux/kernel.h>
	21	#include <linux/leds.h>
	22	#include <linux/module.h>
	23
	24	#include "hid-ids.h"
	25
	26	#define GT683R_BUFFER_SIZE 8
	27
	28	/*
	29	* GT683R_LED_OFF: all LEDs are off
	30	* GT683R_LED_AUDIO: LEDs brightness depends on sound level
	31	* GT683R_LED_BREATHING: LEDs brightness varies at human breathing rate
	32	* GT683R_LED_NORMAL: LEDs are fully on when enabled
	33	*/
	34	enum gt683r_led_mode {
	35	GT683R_LED_OFF = 0,
	36	GT683R_LED_AUDIO = 2,
	37	GT683R_LED_BREATHING = 3,
	38	GT683R_LED_NORMAL = 5
	39	};
	40
	41	enum gt683r_panels {
	42	GT683R_LED_BACK = 0,
	43	GT683R_LED_SIDE = 1,
	44	GT683R_LED_FRONT = 2,
	45	GT683R_LED_COUNT,
	46	};
	47
	48	static const char * const gt683r_panel_names[] = {
	49	"back",
	50	"side",
	51	"front",
	52	};
	53
	54	struct gt683r_led {
	55	struct hid_device *hdev;
	56	struct led_classdev led_devs[GT683R_LED_COUNT];
	57	struct mutex lock;
	58	struct work_struct work;
	59	enum led_brightness brightnesses[GT683R_LED_COUNT];
	60	enum gt683r_led_mode mode;
	61	};
	62
	63	static const struct hid_device_id gt683r_led_id[] = {
	64	{ HID_USB_DEVICE(USB_VENDOR_ID_MSI, USB_DEVICE_ID_MSI_GT683R_LED_PANEL) },
65	{ }
66	};
67
68	static void gt683r_brightness_set(struct led_classdev *led_cdev,
69	enum led_brightness brightness)
70	{
71	int i;
72	struct device *dev = led_cdev->dev->parent;
ee79a8f8	73	struct hid_device *hdev = to_hid_device(dev);
f471d948 JK	74	struct gt683r_led *led = hid_get_drvdata(hdev);
	75
	76	for (i = 0; i < GT683R_LED_COUNT; i++) {
	77	if (led_cdev == &led->led_devs[i])
	78	break;
	79	}
	80
	81	if (i < GT683R_LED_COUNT) {
	82	led->brightnesses[i] = brightness;
	83	schedule_work(&led->work);
	84	}
	85	}
	86
6522fe1c	87	static ssize_t mode_show(struct device *dev,
f471d948 JK	88	struct device_attribute *attr,
	89	char *buf)
	90	{
	91	u8 sysfs_mode;
ee79a8f8	92	struct hid_device *hdev = to_hid_device(dev->parent);
f471d948 JK	93	struct gt683r_led *led = hid_get_drvdata(hdev);
	94
	95	if (led->mode == GT683R_LED_NORMAL)
	96	sysfs_mode = 0;
	97	else if (led->mode == GT683R_LED_AUDIO)
	98	sysfs_mode = 1;
	99	else
	100	sysfs_mode = 2;
	101
	102	return scnprintf(buf, PAGE_SIZE, "%u\n", sysfs_mode);
	103	}
	104
6522fe1c	105	static ssize_t mode_store(struct device *dev,
f471d948 JK	106	struct device_attribute *attr,
	107	const char *buf, size_t count)
	108	{
	109	u8 sysfs_mode;
ee79a8f8	110	struct hid_device *hdev = to_hid_device(dev->parent);
f471d948 JK	111	struct gt683r_led *led = hid_get_drvdata(hdev);
	112
	113
	114	if (kstrtou8(buf, 10, &sysfs_mode) \|\| sysfs_mode > 2)
	115	return -EINVAL;
	116
	117	mutex_lock(&led->lock);
	118
	119	if (sysfs_mode == 0)
	120	led->mode = GT683R_LED_NORMAL;
	121	else if (sysfs_mode == 1)
	122	led->mode = GT683R_LED_AUDIO;
	123	else
	124	led->mode = GT683R_LED_BREATHING;
	125
	126	mutex_unlock(&led->lock);
	127	schedule_work(&led->work);
	128
	129	return count;
	130	}
	131
	132	static int gt683r_led_snd_msg(struct gt683r_led led, u8 msg)
	133	{
	134	int ret;
	135
	136	ret = hid_hw_raw_request(led->hdev, msg[0], msg, GT683R_BUFFER_SIZE,
	137	HID_FEATURE_REPORT, HID_REQ_SET_REPORT);
	138	if (ret != GT683R_BUFFER_SIZE) {
	139	hid_err(led->hdev,
	140	"failed to send set report request: %i\n", ret);
	141	if (ret < 0)
	142	return ret;
	143	return -EIO;
	144	}
	145
	146	return 0;
	147	}
	148
	149	static int gt683r_leds_set(struct gt683r_led *led, u8 leds)
	150	{
	151	int ret;
	152	u8 *buffer;
	153
	154	buffer = kzalloc(GT683R_BUFFER_SIZE, GFP_KERNEL);
	155	if (!buffer)
	156	return -ENOMEM;
	157
	158	buffer[0] = 0x01;
	159	buffer[1] = 0x02;
	160	buffer[2] = 0x30;
	161	buffer[3] = leds;
	162	ret = gt683r_led_snd_msg(led, buffer);
	163
	164	kfree(buffer);
	165	return ret;
	166	}
	167
	168	static int gt683r_mode_set(struct gt683r_led *led, u8 mode)
	169	{
	170	int ret;
	171	u8 *buffer;
	172
	173	buffer = kzalloc(GT683R_BUFFER_SIZE, GFP_KERNEL);
	174	if (!buffer)
175	return -ENOMEM;
176
177	buffer[0] = 0x01;
178	buffer[1] = 0x02;
179	buffer[2] = 0x20;
180	buffer[3] = mode;
181	buffer[4] = 0x01;
182	ret = gt683r_led_snd_msg(led, buffer);
183
184	kfree(buffer);
185	return ret;
186	}
187
188	static void gt683r_led_work(struct work_struct *work)
189	{
190	int i;
191	u8 leds = 0;
192	u8 mode;
193	struct gt683r_led *led = container_of(work, struct gt683r_led, work);
194
195	mutex_lock(&led->lock);
196
197	for (i = 0; i < GT683R_LED_COUNT; i++) {
198	if (led->brightnesses[i])
199	leds \|= BIT(i);
200	}
201
202	if (gt683r_leds_set(led, leds))
203	goto fail;
204
205	if (leds)
206	mode = led->mode;
207	else
208	mode = GT683R_LED_OFF;
209
210	gt683r_mode_set(led, mode);
211	fail:
212	mutex_unlock(&led->lock);
213	}
214
6522fe1c JK	215	static DEVICE_ATTR_RW(mode);
	216
	217	static struct attribute *gt683r_led_attrs[] = {
	218	&dev_attr_mode.attr,
	219	NULL
	220	};
	221
	222	static const struct attribute_group gt683r_led_group = {
	223	.name = "gt683r",
	224	.attrs = gt683r_led_attrs,
	225	};
	226
	227	static const struct attribute_group *gt683r_led_groups[] = {
	228	&gt683r_led_group,
	229	NULL
	230	};
f471d948 JK	231
	232	static int gt683r_led_probe(struct hid_device *hdev,
	233	const struct hid_device_id *id)
	234	{
	235	int i;
	236	int ret;
	237	int name_sz;
	238	char *name;
	239	struct gt683r_led *led;
	240
	241	led = devm_kzalloc(&hdev->dev, sizeof(*led), GFP_KERNEL);
	242	if (!led)
	243	return -ENOMEM;
	244
c3883ae9 JK	245	mutex_init(&led->lock);
	246	INIT_WORK(&led->work, gt683r_led_work);
	247
f471d948 JK	248	led->mode = GT683R_LED_NORMAL;
	249	led->hdev = hdev;
	250	hid_set_drvdata(hdev, led);
	251
	252	ret = hid_parse(hdev);
	253	if (ret) {
	254	hid_err(hdev, "hid parsing failed\n");
	255	return ret;
	256	}
	257
	258	ret = hid_hw_start(hdev, HID_CONNECT_HIDRAW);
	259	if (ret) {
	260	hid_err(hdev, "hw start failed\n");
	261	return ret;
	262	}
	263
	264	for (i = 0; i < GT683R_LED_COUNT; i++) {
	265	name_sz = strlen(dev_name(&hdev->dev)) +
	266	strlen(gt683r_panel_names[i]) + 3;
	267
	268	name = devm_kzalloc(&hdev->dev, name_sz, GFP_KERNEL);
	269	if (!name) {
	270	ret = -ENOMEM;
	271	goto fail;
	272	}
	273
	274	snprintf(name, name_sz, "%s::%s",
	275	dev_name(&hdev->dev), gt683r_panel_names[i]);
	276	led->led_devs[i].name = name;
	277	led->led_devs[i].max_brightness = 1;
	278	led->led_devs[i].brightness_set = gt683r_brightness_set;
6522fe1c JK	279	led->led_devs[i].groups = gt683r_led_groups;
6522fe1c JK	280
f471d948 JK	281	ret = led_classdev_register(&hdev->dev, &led->led_devs[i]);
	282	if (ret) {
	283	hid_err(hdev, "could not register led device\n");
	284	goto fail;
	285	}
	286	}
	287
f471d948 JK	288	return 0;
	289
	290	fail:
	291	for (i = i - 1; i >= 0; i--)
	292	led_classdev_unregister(&led->led_devs[i]);
	293	hid_hw_stop(hdev);
	294	return ret;
	295	}
	296
	297	static void gt683r_led_remove(struct hid_device *hdev)
	298	{
	299	int i;
	300	struct gt683r_led *led = hid_get_drvdata(hdev);
	301
f471d948 JK	302	for (i = 0; i < GT683R_LED_COUNT; i++)
	303	led_classdev_unregister(&led->led_devs[i]);
	304	flush_work(&led->work);
	305	hid_hw_stop(hdev);
	306	}
	307
	308	static struct hid_driver gt683r_led_driver = {
	309	.probe = gt683r_led_probe,
	310	.remove = gt683r_led_remove,
	311	.name = "gt683r_led",
	312	.id_table = gt683r_led_id,
	313	};
	314
	315	module_hid_driver(gt683r_led_driver);
	316
	317	MODULE_AUTHOR("Janne Kanniainen");
	318	MODULE_DESCRIPTION("MSI GT683R led driver");
	319	MODULE_LICENSE("GPL");