[mirror_ubuntu-bionic-kernel.git] / drivers / platform / chrome / cros_ec_lightbar.c

/*
 * cros_ec_lightbar - expose the Chromebook Pixel lightbar to userspace
 *
 * Copyright (C) 2014 Google, Inc.
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

#define pr_fmt(fmt) "cros_ec_lightbar: " fmt

#include <linux/ctype.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/fs.h>
#include <linux/kobject.h>
#include <linux/mfd/cros_ec.h>
#include <linux/mfd/cros_ec_commands.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/uaccess.h>
#include <linux/slab.h>

#include "cros_ec_dev.h"

/* Rate-limit the lightbar interface to prevent DoS. */
static unsigned long lb_interval_jiffies = 50 * HZ / 1000;

static ssize_t interval_msec_show(struct device *dev,
				  struct device_attribute *attr, char *buf)
{
	unsigned long msec = lb_interval_jiffies * 1000 / HZ;

	return scnprintf(buf, PAGE_SIZE, "%lu\n", msec);
}

static ssize_t interval_msec_store(struct device *dev,
				   struct device_attribute *attr,
				   const char *buf, size_t count)
{
	unsigned long msec;

	if (kstrtoul(buf, 0, &msec))
		return -EINVAL;

	lb_interval_jiffies = msec * HZ / 1000;

	return count;
}

static DEFINE_MUTEX(lb_mutex);
/* Return 0 if able to throttle correctly, error otherwise */
static int lb_throttle(void)
{
	static unsigned long last_access;
	unsigned long now, next_timeslot;
	long delay;
	int ret = 0;

	mutex_lock(&lb_mutex);

	now = jiffies;
	next_timeslot = last_access + lb_interval_jiffies;

	if (time_before(now, next_timeslot)) {
		delay = (long)(next_timeslot) - (long)now;
		set_current_state(TASK_INTERRUPTIBLE);
		if (schedule_timeout(delay) > 0) {
			/* interrupted - just abort */
			ret = -EINTR;
			goto out;
		}
		now = jiffies;
	}

	last_access = now;
out:
	mutex_unlock(&lb_mutex);

	return ret;
}

static struct cros_ec_command *alloc_lightbar_cmd_msg(struct cros_ec_dev *ec)
{
	struct cros_ec_command *msg;
	int len;

	len = max(sizeof(struct ec_params_lightbar),
		  sizeof(struct ec_response_lightbar));

	msg = kmalloc(sizeof(*msg) + len, GFP_KERNEL);
	if (!msg)
		return NULL;

	msg->version = 0;
	msg->command = EC_CMD_LIGHTBAR_CMD + ec->cmd_offset;
	msg->outsize = sizeof(struct ec_params_lightbar);
	msg->insize = sizeof(struct ec_response_lightbar);

	return msg;
}

static int get_lightbar_version(struct cros_ec_dev *ec,
				uint32_t *ver_ptr, uint32_t *flg_ptr)
{
	struct ec_params_lightbar *param;
	struct ec_response_lightbar *resp;
	struct cros_ec_command *msg;
	int ret;

	msg = alloc_lightbar_cmd_msg(ec);
	if (!msg)
		return 0;

	param = (struct ec_params_lightbar *)msg->data;
	param->cmd = LIGHTBAR_CMD_VERSION;
	ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
	if (ret < 0) {
		ret = 0;
		goto exit;
	}

	switch (msg->result) {
	case EC_RES_INVALID_PARAM:
		/* Pixel had no version command. */
		if (ver_ptr)
			*ver_ptr = 0;
		if (flg_ptr)
			*flg_ptr = 0;
		ret = 1;
		goto exit;

	case EC_RES_SUCCESS:
		resp = (struct ec_response_lightbar *)msg->data;

		/* Future devices w/lightbars should implement this command */
		if (ver_ptr)
			*ver_ptr = resp->version.num;
		if (flg_ptr)
			*flg_ptr = resp->version.flags;
		ret = 1;
		goto exit;
	}

	/* Anything else (ie, EC_RES_INVALID_COMMAND) - no lightbar */
	ret = 0;
exit:
	kfree(msg);
	return ret;
}

static ssize_t version_show(struct device *dev,
			    struct device_attribute *attr, char *buf)
{
	uint32_t version = 0, flags = 0;
	struct cros_ec_dev *ec = container_of(dev,
					      struct cros_ec_dev, class_dev);
	int ret;

	ret = lb_throttle();
	if (ret)
		return ret;

	/* This should always succeed, because we check during init. */
	if (!get_lightbar_version(ec, &version, &flags))
		return -EIO;

	return scnprintf(buf, PAGE_SIZE, "%d %d\n", version, flags);
}

static ssize_t brightness_store(struct device *dev,
				struct device_attribute *attr,
				const char *buf, size_t count)
{
	struct ec_params_lightbar *param;
	struct cros_ec_command *msg;
	int ret;
	unsigned int val;
	struct cros_ec_dev *ec = container_of(dev,
					      struct cros_ec_dev, class_dev);

	if (kstrtouint(buf, 0, &val))
		return -EINVAL;

	msg = alloc_lightbar_cmd_msg(ec);
	if (!msg)
		return -ENOMEM;

	param = (struct ec_params_lightbar *)msg->data;
	param->cmd = LIGHTBAR_CMD_SET_BRIGHTNESS;
	param->set_brightness.num = val;
	ret = lb_throttle();
	if (ret)
		goto exit;

	ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
	if (ret < 0)
		goto exit;

	if (msg->result != EC_RES_SUCCESS) {
		ret = -EINVAL;
		goto exit;
	}

	ret = count;
exit:
	kfree(msg);
	return ret;
}


/*
 * We expect numbers, and we'll keep reading until we find them, skipping over
 * any whitespace (sysfs guarantees that the input is null-terminated). Every
 * four numbers are sent to the lightbar as <LED,R,G,B>. We fail at the first
 * parsing error, if we don't parse any numbers, or if we have numbers left
 * over.
 */
static ssize_t led_rgb_store(struct device *dev, struct device_attribute *attr,
			     const char *buf, size_t count)
{
	struct ec_params_lightbar *param;
	struct cros_ec_command *msg;
	struct cros_ec_dev *ec = container_of(dev,
					      struct cros_ec_dev, class_dev);
	unsigned int val[4];
	int ret, i = 0, j = 0, ok = 0;

	msg = alloc_lightbar_cmd_msg(ec);
	if (!msg)
		return -ENOMEM;

	do {
		/* Skip any whitespace */
		while (*buf && isspace(*buf))
			buf++;

		if (!*buf)
			break;

		ret = sscanf(buf, "%i", &val[i++]);
		if (ret == 0)
			goto exit;

		if (i == 4) {
			param = (struct ec_params_lightbar *)msg->data;
			param->cmd = LIGHTBAR_CMD_SET_RGB;
			param->set_rgb.led = val[0];
			param->set_rgb.red = val[1];
			param->set_rgb.green = val[2];
			param->set_rgb.blue = val[3];
			/*
			 * Throttle only the first of every four transactions,
			 * so that the user can update all four LEDs at once.
			 */
			if ((j++ % 4) == 0) {
				ret = lb_throttle();
				if (ret)
					goto exit;
			}

			ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
			if (ret < 0)
				goto exit;

			if (msg->result != EC_RES_SUCCESS)
				goto exit;

			i = 0;
			ok = 1;
		}

		/* Skip over the number we just read */
		while (*buf && !isspace(*buf))
			buf++;

	} while (*buf);

exit:
	kfree(msg);
	return (ok && i == 0) ? count : -EINVAL;
}

static char const *seqname[] = {
	"ERROR", "S5", "S3", "S0", "S5S3", "S3S0",
	"S0S3", "S3S5", "STOP", "RUN", "PULSE", "TEST", "KONAMI",
};

static ssize_t sequence_show(struct device *dev,
			     struct device_attribute *attr, char *buf)
{
	struct ec_params_lightbar *param;
	struct ec_response_lightbar *resp;
	struct cros_ec_command *msg;
	int ret;
	struct cros_ec_dev *ec = container_of(dev,
					      struct cros_ec_dev, class_dev);

	msg = alloc_lightbar_cmd_msg(ec);
	if (!msg)
		return -ENOMEM;

	param = (struct ec_params_lightbar *)msg->data;
	param->cmd = LIGHTBAR_CMD_GET_SEQ;
	ret = lb_throttle();
	if (ret)
		goto exit;

	ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
	if (ret < 0)
		goto exit;

	if (msg->result != EC_RES_SUCCESS) {
		ret = scnprintf(buf, PAGE_SIZE,
				"ERROR: EC returned %d\n", msg->result);
		goto exit;
	}

	resp = (struct ec_response_lightbar *)msg->data;
	if (resp->get_seq.num >= ARRAY_SIZE(seqname))
		ret = scnprintf(buf, PAGE_SIZE, "%d\n", resp->get_seq.num);
	else
		ret = scnprintf(buf, PAGE_SIZE, "%s\n",
				seqname[resp->get_seq.num]);

exit:
	kfree(msg);
	return ret;
}

static ssize_t sequence_store(struct device *dev, struct device_attribute *attr,
			      const char *buf, size_t count)
{
	struct ec_params_lightbar *param;
	struct cros_ec_command *msg;
	unsigned int num;
	int ret, len;
	struct cros_ec_dev *ec = container_of(dev,
					      struct cros_ec_dev, class_dev);

	for (len = 0; len < count; len++)
		if (!isalnum(buf[len]))
			break;

	for (num = 0; num < ARRAY_SIZE(seqname); num++)
		if (!strncasecmp(seqname[num], buf, len))
			break;

	if (num >= ARRAY_SIZE(seqname)) {
		ret = kstrtouint(buf, 0, &num);
		if (ret)
			return ret;
	}

	msg = alloc_lightbar_cmd_msg(ec);
	if (!msg)
		return -ENOMEM;

	param = (struct ec_params_lightbar *)msg->data;
	param->cmd = LIGHTBAR_CMD_SEQ;
	param->seq.num = num;
	ret = lb_throttle();
	if (ret)
		goto exit;

	ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
	if (ret < 0)
		goto exit;

	if (msg->result != EC_RES_SUCCESS) {
		ret = -EINVAL;
		goto exit;
	}

	ret = count;
exit:
	kfree(msg);
	return ret;
}

/* Module initialization */

static DEVICE_ATTR_RW(interval_msec);
static DEVICE_ATTR_RO(version);
static DEVICE_ATTR_WO(brightness);
static DEVICE_ATTR_WO(led_rgb);
static DEVICE_ATTR_RW(sequence);
static struct attribute *__lb_cmds_attrs[] = {
	&dev_attr_interval_msec.attr,
	&dev_attr_version.attr,
	&dev_attr_brightness.attr,
	&dev_attr_led_rgb.attr,
	&dev_attr_sequence.attr,
	NULL,
};

static umode_t cros_ec_lightbar_attrs_are_visible(struct kobject *kobj,
						  struct attribute *a, int n)
{
	struct device *dev = container_of(kobj, struct device, kobj);
	struct cros_ec_dev *ec = container_of(dev,
					      struct cros_ec_dev, class_dev);
	struct platform_device *pdev = to_platform_device(ec->dev);
	struct cros_ec_platform *pdata = pdev->dev.platform_data;
	int is_cros_ec;

	is_cros_ec = strcmp(pdata->ec_name, CROS_EC_DEV_NAME);

	if (is_cros_ec != 0)
		return 0;

	/* Only instantiate this stuff if the EC has a lightbar */
	if (get_lightbar_version(ec, NULL, NULL))
		return a->mode;
	else
		return 0;
}

struct attribute_group cros_ec_lightbar_attr_group = {
	.name = "lightbar",
	.attrs = __lb_cmds_attrs,
	.is_visible = cros_ec_lightbar_attrs_are_visible,
};
Commit	Line	Data
f3f837e5 BR	1	/*
	2	* cros_ec_lightbar - expose the Chromebook Pixel lightbar to userspace
	3	*
	4	* Copyright (C) 2014 Google, Inc.
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (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	* You should have received a copy of the GNU General Public License
	17	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	18	*/
	19
	20	#define pr_fmt(fmt) "cros_ec_lightbar: " fmt
	21
	22	#include <linux/ctype.h>
	23	#include <linux/delay.h>
	24	#include <linux/device.h>
	25	#include <linux/fs.h>
	26	#include <linux/kobject.h>
	27	#include <linux/mfd/cros_ec.h>
	28	#include <linux/mfd/cros_ec_commands.h>
	29	#include <linux/module.h>
	30	#include <linux/platform_device.h>
	31	#include <linux/sched.h>
	32	#include <linux/types.h>
	33	#include <linux/uaccess.h>
a8411784	34	#include <linux/slab.h>
f3f837e5 BR	35
	36	#include "cros_ec_dev.h"
	37
	38	/* Rate-limit the lightbar interface to prevent DoS. */
	39	static unsigned long lb_interval_jiffies = 50 * HZ / 1000;
	40
	41	static ssize_t interval_msec_show(struct device *dev,
	42	struct device_attribute attr, char buf)
	43	{
	44	unsigned long msec = lb_interval_jiffies * 1000 / HZ;
	45
	46	return scnprintf(buf, PAGE_SIZE, "%lu\n", msec);
	47	}
	48
	49	static ssize_t interval_msec_store(struct device *dev,
	50	struct device_attribute *attr,
	51	const char *buf, size_t count)
	52	{
	53	unsigned long msec;
	54
	55	if (kstrtoul(buf, 0, &msec))
	56	return -EINVAL;
	57
	58	lb_interval_jiffies = msec * HZ / 1000;
	59
	60	return count;
	61	}
	62
	63	static DEFINE_MUTEX(lb_mutex);
	64	/* Return 0 if able to throttle correctly, error otherwise */
	65	static int lb_throttle(void)
	66	{
	67	static unsigned long last_access;
	68	unsigned long now, next_timeslot;
	69	long delay;
	70	int ret = 0;
	71
	72	mutex_lock(&lb_mutex);
	73
	74	now = jiffies;
	75	next_timeslot = last_access + lb_interval_jiffies;
	76
	77	if (time_before(now, next_timeslot)) {
	78	delay = (long)(next_timeslot) - (long)now;
	79	set_current_state(TASK_INTERRUPTIBLE);
	80	if (schedule_timeout(delay) > 0) {
	81	/* interrupted - just abort */
	82	ret = -EINTR;
	83	goto out;
	84	}
	85	now = jiffies;
	86	}
	87
	88	last_access = now;
	89	out:
	90	mutex_unlock(&lb_mutex);
	91
	92	return ret;
	93	}
	94
57b33ff0	95	static struct cros_ec_command alloc_lightbar_cmd_msg(struct cros_ec_dev ec)
a8411784 JMC	96	{
	97	struct cros_ec_command *msg;
	98	int len;
	99
	100	len = max(sizeof(struct ec_params_lightbar),
	101	sizeof(struct ec_response_lightbar));
	102
	103	msg = kmalloc(sizeof(*msg) + len, GFP_KERNEL);
	104	if (!msg)
	105	return NULL;
	106
	107	msg->version = 0;
57b33ff0	108	msg->command = EC_CMD_LIGHTBAR_CMD + ec->cmd_offset;
a8411784 JMC	109	msg->outsize = sizeof(struct ec_params_lightbar);
	110	msg->insize = sizeof(struct ec_response_lightbar);
	111
	112	return msg;
	113	}
f3f837e5	114
57b33ff0	115	static int get_lightbar_version(struct cros_ec_dev *ec,
f3f837e5 BR	116	uint32_t ver_ptr, uint32_t flg_ptr)
	117	{
	118	struct ec_params_lightbar *param;
	119	struct ec_response_lightbar *resp;
a8411784	120	struct cros_ec_command *msg;
f3f837e5 BR	121	int ret;
f3f837e5 BR	122
57b33ff0	123	msg = alloc_lightbar_cmd_msg(ec);
a8411784	124	if (!msg)
f3f837e5 BR	125	return 0;
f3f837e5 BR	126
a8411784 JMC	127	param = (struct ec_params_lightbar *)msg->data;
a8411784 JMC	128	param->cmd = LIGHTBAR_CMD_VERSION;
57b33ff0	129	ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
a8411784 JMC	130	if (ret < 0) {
	131	ret = 0;
	132	goto exit;
	133	}
	134
	135	switch (msg->result) {
f3f837e5 BR	136	case EC_RES_INVALID_PARAM:
	137	/* Pixel had no version command. */
	138	if (ver_ptr)
	139	*ver_ptr = 0;
	140	if (flg_ptr)
	141	*flg_ptr = 0;
a8411784 JMC	142	ret = 1;
a8411784 JMC	143	goto exit;
f3f837e5 BR	144
f3f837e5 BR	145	case EC_RES_SUCCESS:
a8411784	146	resp = (struct ec_response_lightbar *)msg->data;
f3f837e5 BR	147
	148	/* Future devices w/lightbars should implement this command */
	149	if (ver_ptr)
	150	*ver_ptr = resp->version.num;
	151	if (flg_ptr)
	152	*flg_ptr = resp->version.flags;
a8411784 JMC	153	ret = 1;
a8411784 JMC	154	goto exit;
f3f837e5 BR	155	}
	156
	157	/* Anything else (ie, EC_RES_INVALID_COMMAND) - no lightbar */
a8411784 JMC	158	ret = 0;
	159	exit:
	160	kfree(msg);
	161	return ret;
f3f837e5 BR	162	}
	163
	164	static ssize_t version_show(struct device *dev,
	165	struct device_attribute attr, char buf)
	166	{
a8411784	167	uint32_t version = 0, flags = 0;
57b33ff0 GG	168	struct cros_ec_dev *ec = container_of(dev,
57b33ff0 GG	169	struct cros_ec_dev, class_dev);
f3f837e5 BR	170	int ret;
	171
	172	ret = lb_throttle();
	173	if (ret)
	174	return ret;
	175
	176	/* This should always succeed, because we check during init. */
	177	if (!get_lightbar_version(ec, &version, &flags))
	178	return -EIO;
	179
	180	return scnprintf(buf, PAGE_SIZE, "%d %d\n", version, flags);
	181	}
	182
	183	static ssize_t brightness_store(struct device *dev,
	184	struct device_attribute *attr,
	185	const char *buf, size_t count)
	186	{
	187	struct ec_params_lightbar *param;
a8411784	188	struct cros_ec_command *msg;
f3f837e5 BR	189	int ret;
f3f837e5 BR	190	unsigned int val;
57b33ff0 GG	191	struct cros_ec_dev *ec = container_of(dev,
57b33ff0 GG	192	struct cros_ec_dev, class_dev);
f3f837e5 BR	193
	194	if (kstrtouint(buf, 0, &val))
	195	return -EINVAL;
	196
57b33ff0	197	msg = alloc_lightbar_cmd_msg(ec);
a8411784 JMC	198	if (!msg)
	199	return -ENOMEM;
	200
	201	param = (struct ec_params_lightbar *)msg->data;
256ab950 SB	202	param->cmd = LIGHTBAR_CMD_SET_BRIGHTNESS;
256ab950 SB	203	param->set_brightness.num = val;
f3f837e5 BR	204	ret = lb_throttle();
f3f837e5 BR	205	if (ret)
a8411784	206	goto exit;
f3f837e5	207
57b33ff0	208	ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
f3f837e5	209	if (ret < 0)
a8411784	210	goto exit;
f3f837e5	211
a8411784 JMC	212	if (msg->result != EC_RES_SUCCESS) {
	213	ret = -EINVAL;
	214	goto exit;
	215	}
f3f837e5	216
a8411784 JMC	217	ret = count;
	218	exit:
	219	kfree(msg);
	220	return ret;
f3f837e5 BR	221	}
	222
	223
	224	/*
	225	* We expect numbers, and we'll keep reading until we find them, skipping over
	226	* any whitespace (sysfs guarantees that the input is null-terminated). Every
	227	* four numbers are sent to the lightbar as <LED,R,G,B>. We fail at the first
	228	* parsing error, if we don't parse any numbers, or if we have numbers left
	229	* over.
	230	*/
	231	static ssize_t led_rgb_store(struct device dev, struct device_attribute attr,
	232	const char *buf, size_t count)
	233	{
	234	struct ec_params_lightbar *param;
a8411784	235	struct cros_ec_command *msg;
57b33ff0 GG	236	struct cros_ec_dev *ec = container_of(dev,
57b33ff0 GG	237	struct cros_ec_dev, class_dev);
f3f837e5 BR	238	unsigned int val[4];
	239	int ret, i = 0, j = 0, ok = 0;
	240
57b33ff0	241	msg = alloc_lightbar_cmd_msg(ec);
a8411784 JMC	242	if (!msg)
	243	return -ENOMEM;
	244
f3f837e5 BR	245	do {
	246	/* Skip any whitespace */
	247	while (buf && isspace(buf))
	248	buf++;
	249
	250	if (!*buf)
	251	break;
	252
	253	ret = sscanf(buf, "%i", &val[i++]);
	254	if (ret == 0)
f14ae099	255	goto exit;
f3f837e5 BR	256
f3f837e5 BR	257	if (i == 4) {
a8411784	258	param = (struct ec_params_lightbar *)msg->data;
256ab950 SB	259	param->cmd = LIGHTBAR_CMD_SET_RGB;
	260	param->set_rgb.led = val[0];
	261	param->set_rgb.red = val[1];
	262	param->set_rgb.green = val[2];
	263	param->set_rgb.blue = val[3];
f3f837e5 BR	264	/*
	265	* Throttle only the first of every four transactions,
	266	* so that the user can update all four LEDs at once.
	267	*/
	268	if ((j++ % 4) == 0) {
	269	ret = lb_throttle();
	270	if (ret)
f14ae099	271	goto exit;
f3f837e5 BR	272	}
f3f837e5 BR	273
57b33ff0	274	ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
f3f837e5	275	if (ret < 0)
a8411784	276	goto exit;
f3f837e5	277
f14ae099	278	if (msg->result != EC_RES_SUCCESS)
a8411784	279	goto exit;
f3f837e5 BR	280
	281	i = 0;
	282	ok = 1;
	283	}
	284
	285	/* Skip over the number we just read */
	286	while (buf && !isspace(buf))
	287	buf++;
	288
	289	} while (*buf);
	290
a8411784 JMC	291	exit:
a8411784 JMC	292	kfree(msg);
f3f837e5 BR	293	return (ok && i == 0) ? count : -EINVAL;
	294	}
	295
377415ab	296	static char const *seqname[] = {
f3f837e5 BR	297	"ERROR", "S5", "S3", "S0", "S5S3", "S3S0",
	298	"S0S3", "S3S5", "STOP", "RUN", "PULSE", "TEST", "KONAMI",
	299	};
	300
	301	static ssize_t sequence_show(struct device *dev,
	302	struct device_attribute attr, char buf)
	303	{
	304	struct ec_params_lightbar *param;
	305	struct ec_response_lightbar *resp;
a8411784	306	struct cros_ec_command *msg;
f3f837e5	307	int ret;
57b33ff0 GG	308	struct cros_ec_dev *ec = container_of(dev,
57b33ff0 GG	309	struct cros_ec_dev, class_dev);
f3f837e5	310
57b33ff0	311	msg = alloc_lightbar_cmd_msg(ec);
a8411784 JMC	312	if (!msg)
	313	return -ENOMEM;
	314
	315	param = (struct ec_params_lightbar *)msg->data;
f3f837e5 BR	316	param->cmd = LIGHTBAR_CMD_GET_SEQ;
	317	ret = lb_throttle();
	318	if (ret)
a8411784	319	goto exit;
f3f837e5	320
57b33ff0	321	ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
f3f837e5	322	if (ret < 0)
a8411784	323	goto exit;
f3f837e5	324
a8411784 JMC	325	if (msg->result != EC_RES_SUCCESS) {
	326	ret = scnprintf(buf, PAGE_SIZE,
	327	"ERROR: EC returned %d\n", msg->result);
	328	goto exit;
	329	}
f3f837e5	330
a8411784	331	resp = (struct ec_response_lightbar *)msg->data;
f3f837e5	332	if (resp->get_seq.num >= ARRAY_SIZE(seqname))
a8411784	333	ret = scnprintf(buf, PAGE_SIZE, "%d\n", resp->get_seq.num);
f3f837e5	334	else
a8411784 JMC	335	ret = scnprintf(buf, PAGE_SIZE, "%s\n",
	336	seqname[resp->get_seq.num]);
	337
	338	exit:
	339	kfree(msg);
	340	return ret;
f3f837e5 BR	341	}
	342
	343	static ssize_t sequence_store(struct device dev, struct device_attribute attr,
	344	const char *buf, size_t count)
	345	{
	346	struct ec_params_lightbar *param;
a8411784	347	struct cros_ec_command *msg;
f3f837e5 BR	348	unsigned int num;
f3f837e5 BR	349	int ret, len;
57b33ff0 GG	350	struct cros_ec_dev *ec = container_of(dev,
57b33ff0 GG	351	struct cros_ec_dev, class_dev);
f3f837e5 BR	352
	353	for (len = 0; len < count; len++)
	354	if (!isalnum(buf[len]))
	355	break;
	356
	357	for (num = 0; num < ARRAY_SIZE(seqname); num++)
	358	if (!strncasecmp(seqname[num], buf, len))
	359	break;
	360
	361	if (num >= ARRAY_SIZE(seqname)) {
	362	ret = kstrtouint(buf, 0, &num);
	363	if (ret)
	364	return ret;
	365	}
	366
88dfb8b4 CE	367	msg = alloc_lightbar_cmd_msg(ec);
	368	if (!msg)
	369	return -ENOMEM;
	370
a8411784	371	param = (struct ec_params_lightbar *)msg->data;
f3f837e5 BR	372	param->cmd = LIGHTBAR_CMD_SEQ;
	373	param->seq.num = num;
	374	ret = lb_throttle();
	375	if (ret)
88dfb8b4	376	goto exit;
f3f837e5	377
57b33ff0	378	ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
f3f837e5	379	if (ret < 0)
88dfb8b4	380	goto exit;
f3f837e5	381
88dfb8b4 CE	382	if (msg->result != EC_RES_SUCCESS) {
	383	ret = -EINVAL;
	384	goto exit;
	385	}
f3f837e5	386
88dfb8b4 CE	387	ret = count;
	388	exit:
	389	kfree(msg);
	390	return ret;
f3f837e5 BR	391	}
	392
	393	/* Module initialization */
	394
	395	static DEVICE_ATTR_RW(interval_msec);
	396	static DEVICE_ATTR_RO(version);
	397	static DEVICE_ATTR_WO(brightness);
	398	static DEVICE_ATTR_WO(led_rgb);
	399	static DEVICE_ATTR_RW(sequence);
	400	static struct attribute *__lb_cmds_attrs[] = {
	401	&dev_attr_interval_msec.attr,
	402	&dev_attr_version.attr,
	403	&dev_attr_brightness.attr,
	404	&dev_attr_led_rgb.attr,
	405	&dev_attr_sequence.attr,
	406	NULL,
	407	};
f3f837e5	408
57b33ff0 GG	409	static umode_t cros_ec_lightbar_attrs_are_visible(struct kobject *kobj,
57b33ff0 GG	410	struct attribute *a, int n)
f3f837e5	411	{
57b33ff0 GG	412	struct device *dev = container_of(kobj, struct device, kobj);
	413	struct cros_ec_dev *ec = container_of(dev,
	414	struct cros_ec_dev, class_dev);
48b9b6d4	415	struct platform_device *pdev = to_platform_device(ec->dev);
d940f306 CS	416	struct cros_ec_platform *pdata = pdev->dev.platform_data;
	417	int is_cros_ec;
	418
	419	is_cros_ec = strcmp(pdata->ec_name, CROS_EC_DEV_NAME);
	420
	421	if (is_cros_ec != 0)
57b33ff0	422	return 0;
f3f837e5 BR	423
f3f837e5 BR	424	/* Only instantiate this stuff if the EC has a lightbar */
57b33ff0 GG	425	if (get_lightbar_version(ec, NULL, NULL))
	426	return a->mode;
	427	else
	428	return 0;
f3f837e5 BR	429	}
f3f837e5 BR	430
57b33ff0 GG	431	struct attribute_group cros_ec_lightbar_attr_group = {
	432	.name = "lightbar",
	433	.attrs = __lb_cmds_attrs,
	434	.is_visible = cros_ec_lightbar_attrs_are_visible,
	435	};