[mirror_ubuntu-zesty-kernel.git] / drivers / platform / olpc / olpc-ec.c

/*
 * Generic driver for the OLPC Embedded Controller.
 *
 * Author: Andres Salomon <dilinger@queued.net>
 *
 * Copyright (C) 2011-2012 One Laptop per Child Foundation.
 *
 * Licensed under the GPL v2 or later.
 */
#include <linux/completion.h>
#include <linux/debugfs.h>
#include <linux/spinlock.h>
#include <linux/mutex.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/olpc-ec.h>
#include <asm/olpc.h>

struct ec_cmd_desc {
	u8 cmd;
	u8 *inbuf, *outbuf;
	size_t inlen, outlen;

	int err;
	struct completion finished;
	struct list_head node;

	void *priv;
};

struct olpc_ec_priv {
	struct olpc_ec_driver *drv;
	struct work_struct worker;
	struct mutex cmd_lock;

	/* Pending EC commands */
	struct list_head cmd_q;
	spinlock_t cmd_q_lock;

	struct dentry *dbgfs_dir;

	/*
	 * Running an EC command while suspending means we don't always finish
	 * the command before the machine suspends.  This means that the EC
	 * is expecting the command protocol to finish, but we after a period
	 * of time (while the OS is asleep) the EC times out and restarts its
	 * idle loop.  Meanwhile, the OS wakes up, thinks it's still in the
	 * middle of the command protocol, starts throwing random things at
	 * the EC... and everyone's uphappy.
	 */
	bool suspended;
};

static struct olpc_ec_driver *ec_driver;
static struct olpc_ec_priv *ec_priv;
static void *ec_cb_arg;

void olpc_ec_driver_register(struct olpc_ec_driver *drv, void *arg)
{
	ec_driver = drv;
	ec_cb_arg = arg;
}
EXPORT_SYMBOL_GPL(olpc_ec_driver_register);

static void olpc_ec_worker(struct work_struct *w)
{
	struct olpc_ec_priv *ec = container_of(w, struct olpc_ec_priv, worker);
	struct ec_cmd_desc *desc = NULL;
	unsigned long flags;

	/* Grab the first pending command from the queue */
	spin_lock_irqsave(&ec->cmd_q_lock, flags);
	if (!list_empty(&ec->cmd_q)) {
		desc = list_first_entry(&ec->cmd_q, struct ec_cmd_desc, node);
		list_del(&desc->node);
	}
	spin_unlock_irqrestore(&ec->cmd_q_lock, flags);

	/* Do we actually have anything to do? */
	if (!desc)
		return;

	/* Protect the EC hw with a mutex; only run one cmd at a time */
	mutex_lock(&ec->cmd_lock);
	desc->err = ec_driver->ec_cmd(desc->cmd, desc->inbuf, desc->inlen,
			desc->outbuf, desc->outlen, ec_cb_arg);
	mutex_unlock(&ec->cmd_lock);

	/* Finished, wake up olpc_ec_cmd() */
	complete(&desc->finished);

	/* Run the worker thread again in case there are more cmds pending */
	schedule_work(&ec->worker);
}

/*
 * Throw a cmd descripter onto the list.  We now have SMP OLPC machines, so
 * locking is pretty critical.
 */
static void queue_ec_descriptor(struct ec_cmd_desc *desc,
		struct olpc_ec_priv *ec)
{
	unsigned long flags;

	INIT_LIST_HEAD(&desc->node);

	spin_lock_irqsave(&ec->cmd_q_lock, flags);
	list_add_tail(&desc->node, &ec->cmd_q);
	spin_unlock_irqrestore(&ec->cmd_q_lock, flags);

	schedule_work(&ec->worker);
}

int olpc_ec_cmd(u8 cmd, u8 *inbuf, size_t inlen, u8 *outbuf, size_t outlen)
{
	struct olpc_ec_priv *ec = ec_priv;
	struct ec_cmd_desc desc;

	/* Ensure a driver and ec hook have been registered */
	if (WARN_ON(!ec_driver || !ec_driver->ec_cmd))
		return -ENODEV;

	if (!ec)
		return -ENOMEM;

	/* Suspending in the middle of a command hoses things really badly */
	if (WARN_ON(ec->suspended))
		return -EBUSY;

	might_sleep();

	desc.cmd = cmd;
	desc.inbuf = inbuf;
	desc.outbuf = outbuf;
	desc.inlen = inlen;
	desc.outlen = outlen;
	desc.err = 0;
	init_completion(&desc.finished);

	queue_ec_descriptor(&desc, ec);

	/* Timeouts must be handled in the platform-specific EC hook */
	wait_for_completion(&desc.finished);

	/* The worker thread dequeues the cmd; no need to do anything here */
	return desc.err;
}
EXPORT_SYMBOL_GPL(olpc_ec_cmd);

#ifdef CONFIG_DEBUG_FS

/*
 * debugfs support for "generic commands", to allow sending
 * arbitrary EC commands from userspace.
 */

#define EC_MAX_CMD_ARGS (5 + 1)		/* cmd byte + 5 args */
#define EC_MAX_CMD_REPLY (8)

static DEFINE_MUTEX(ec_dbgfs_lock);
static unsigned char ec_dbgfs_resp[EC_MAX_CMD_REPLY];
static unsigned int ec_dbgfs_resp_bytes;

static ssize_t ec_dbgfs_cmd_write(struct file *file, const char __user *buf,
		size_t size, loff_t *ppos)
{
	int i, m;
	unsigned char ec_cmd[EC_MAX_CMD_ARGS];
	unsigned int ec_cmd_int[EC_MAX_CMD_ARGS];
	char cmdbuf[64];
	int ec_cmd_bytes;

	mutex_lock(&ec_dbgfs_lock);

	size = simple_write_to_buffer(cmdbuf, sizeof(cmdbuf), ppos, buf, size);

	m = sscanf(cmdbuf, "%x:%u %x %x %x %x %x", &ec_cmd_int[0],
			&ec_dbgfs_resp_bytes, &ec_cmd_int[1], &ec_cmd_int[2],
			&ec_cmd_int[3], &ec_cmd_int[4], &ec_cmd_int[5]);
	if (m < 2 || ec_dbgfs_resp_bytes > EC_MAX_CMD_REPLY) {
		/* reset to prevent overflow on read */
		ec_dbgfs_resp_bytes = 0;

		pr_debug("olpc-ec: bad ec cmd:  cmd:response-count [arg1 [arg2 ...]]\n");
		size = -EINVAL;
		goto out;
	}

	/* convert scanf'd ints to char */
	ec_cmd_bytes = m - 2;
	for (i = 0; i <= ec_cmd_bytes; i++)
		ec_cmd[i] = ec_cmd_int[i];

	pr_debug("olpc-ec: debugfs cmd 0x%02x with %d args %5ph, want %d returns\n",
			ec_cmd[0], ec_cmd_bytes, ec_cmd + 1,
			ec_dbgfs_resp_bytes);

	olpc_ec_cmd(ec_cmd[0], (ec_cmd_bytes == 0) ? NULL : &ec_cmd[1],
			ec_cmd_bytes, ec_dbgfs_resp, ec_dbgfs_resp_bytes);

	pr_debug("olpc-ec: response %8ph (%d bytes expected)\n",
			ec_dbgfs_resp, ec_dbgfs_resp_bytes);

out:
	mutex_unlock(&ec_dbgfs_lock);
	return size;
}

static ssize_t ec_dbgfs_cmd_read(struct file *file, char __user *buf,
		size_t size, loff_t *ppos)
{
	unsigned int i, r;
	char *rp;
	char respbuf[64];

	mutex_lock(&ec_dbgfs_lock);
	rp = respbuf;
	rp += sprintf(rp, "%02x", ec_dbgfs_resp[0]);
	for (i = 1; i < ec_dbgfs_resp_bytes; i++)
		rp += sprintf(rp, ", %02x", ec_dbgfs_resp[i]);
	mutex_unlock(&ec_dbgfs_lock);
	rp += sprintf(rp, "\n");

	r = rp - respbuf;
	return simple_read_from_buffer(buf, size, ppos, respbuf, r);
}

static const struct file_operations ec_dbgfs_ops = {
	.write = ec_dbgfs_cmd_write,
	.read = ec_dbgfs_cmd_read,
};

static struct dentry *olpc_ec_setup_debugfs(void)
{
	struct dentry *dbgfs_dir;

	dbgfs_dir = debugfs_create_dir("olpc-ec", NULL);
	if (IS_ERR_OR_NULL(dbgfs_dir))
		return NULL;

	debugfs_create_file("cmd", 0600, dbgfs_dir, NULL, &ec_dbgfs_ops);

	return dbgfs_dir;
}

#else

static struct dentry *olpc_ec_setup_debugfs(void)
{
	return NULL;
}

#endif /* CONFIG_DEBUG_FS */

static int olpc_ec_probe(struct platform_device *pdev)
{
	struct olpc_ec_priv *ec;
	int err;

	if (!ec_driver)
		return -ENODEV;

	ec = kzalloc(sizeof(*ec), GFP_KERNEL);
	if (!ec)
		return -ENOMEM;

	ec->drv = ec_driver;
	INIT_WORK(&ec->worker, olpc_ec_worker);
	mutex_init(&ec->cmd_lock);

	INIT_LIST_HEAD(&ec->cmd_q);
	spin_lock_init(&ec->cmd_q_lock);

	ec_priv = ec;
	platform_set_drvdata(pdev, ec);

	err = ec_driver->probe ? ec_driver->probe(pdev) : 0;
	if (err) {
		ec_priv = NULL;
		kfree(ec);
	} else {
		ec->dbgfs_dir = olpc_ec_setup_debugfs();
	}

	return err;
}

static int olpc_ec_suspend(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct olpc_ec_priv *ec = platform_get_drvdata(pdev);
	int err = 0;

	if (ec_driver->suspend)
		err = ec_driver->suspend(pdev);
	if (!err)
		ec->suspended = true;

	return err;
}

static int olpc_ec_resume(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct olpc_ec_priv *ec = platform_get_drvdata(pdev);

	ec->suspended = false;
	return ec_driver->resume ? ec_driver->resume(pdev) : 0;
}

static const struct dev_pm_ops olpc_ec_pm_ops = {
	.suspend_late = olpc_ec_suspend,
	.resume_early = olpc_ec_resume,
};

static struct platform_driver olpc_ec_plat_driver = {
	.probe = olpc_ec_probe,
	.driver = {
		.name = "olpc-ec",
		.pm = &olpc_ec_pm_ops,
	},
};

static int __init olpc_ec_init_module(void)
{
	return platform_driver_register(&olpc_ec_plat_driver);
}
arch_initcall(olpc_ec_init_module);
Commit	Line	Data
392a325c AS	1	/*
	2	* Generic driver for the OLPC Embedded Controller.
	3	*
f48d1496 PG	4	* Author: Andres Salomon <dilinger@queued.net>
f48d1496 PG	5	*
392a325c AS	6	* Copyright (C) 2011-2012 One Laptop per Child Foundation.
	7	*
	8	* Licensed under the GPL v2 or later.
	9	*/
3d26c20b	10	#include <linux/completion.h>
6cca83d4	11	#include <linux/debugfs.h>
3d26c20b AS	12	#include <linux/spinlock.h>
3d26c20b AS	13	#include <linux/mutex.h>
ac250415	14	#include <linux/platform_device.h>
d278b7a2	15	#include <linux/slab.h>
3d26c20b	16	#include <linux/workqueue.h>
f48d1496	17	#include <linux/init.h>
3d26c20b AS	18	#include <linux/list.h>
3d26c20b AS	19	#include <linux/olpc-ec.h>
392a325c AS	20	#include <asm/olpc.h>
392a325c AS	21
3d26c20b AS	22	struct ec_cmd_desc {
	23	u8 cmd;
	24	u8 inbuf, outbuf;
	25	size_t inlen, outlen;
	26
	27	int err;
	28	struct completion finished;
	29	struct list_head node;
	30
	31	void *priv;
	32	};
	33
d278b7a2 AS	34	struct olpc_ec_priv {
d278b7a2 AS	35	struct olpc_ec_driver *drv;
99ecb01c AS	36	struct work_struct worker;
	37	struct mutex cmd_lock;
	38
	39	/* Pending EC commands */
	40	struct list_head cmd_q;
	41	spinlock_t cmd_q_lock;
d278b7a2	42
6cca83d4 AS	43	struct dentry *dbgfs_dir;
6cca83d4 AS	44
d278b7a2 AS	45	/*
	46	* Running an EC command while suspending means we don't always finish
	47	* the command before the machine suspends. This means that the EC
	48	* is expecting the command protocol to finish, but we after a period
	49	* of time (while the OS is asleep) the EC times out and restarts its
	50	* idle loop. Meanwhile, the OS wakes up, thinks it's still in the
	51	* middle of the command protocol, starts throwing random things at
	52	* the EC... and everyone's uphappy.
	53	*/
	54	bool suspended;
	55	};
	56
3d26c20b	57	static struct olpc_ec_driver *ec_driver;
d278b7a2	58	static struct olpc_ec_priv *ec_priv;
3d26c20b	59	static void *ec_cb_arg;
3d26c20b AS	60
	61	void olpc_ec_driver_register(struct olpc_ec_driver drv, void arg)
	62	{
	63	ec_driver = drv;
	64	ec_cb_arg = arg;
	65	}
	66	EXPORT_SYMBOL_GPL(olpc_ec_driver_register);
	67
	68	static void olpc_ec_worker(struct work_struct *w)
	69	{
99ecb01c	70	struct olpc_ec_priv *ec = container_of(w, struct olpc_ec_priv, worker);
3d26c20b AS	71	struct ec_cmd_desc *desc = NULL;
	72	unsigned long flags;
	73
	74	/* Grab the first pending command from the queue */
99ecb01c AS	75	spin_lock_irqsave(&ec->cmd_q_lock, flags);
	76	if (!list_empty(&ec->cmd_q)) {
	77	desc = list_first_entry(&ec->cmd_q, struct ec_cmd_desc, node);
3d26c20b AS	78	list_del(&desc->node);
3d26c20b AS	79	}
99ecb01c	80	spin_unlock_irqrestore(&ec->cmd_q_lock, flags);
3d26c20b AS	81
	82	/* Do we actually have anything to do? */
	83	if (!desc)
	84	return;
	85
	86	/* Protect the EC hw with a mutex; only run one cmd at a time */
99ecb01c	87	mutex_lock(&ec->cmd_lock);
3d26c20b AS	88	desc->err = ec_driver->ec_cmd(desc->cmd, desc->inbuf, desc->inlen,
3d26c20b AS	89	desc->outbuf, desc->outlen, ec_cb_arg);
99ecb01c	90	mutex_unlock(&ec->cmd_lock);
3d26c20b AS	91
	92	/* Finished, wake up olpc_ec_cmd() */
	93	complete(&desc->finished);
	94
	95	/* Run the worker thread again in case there are more cmds pending */
99ecb01c	96	schedule_work(&ec->worker);
3d26c20b AS	97	}
	98
	99	/*
	100	* Throw a cmd descripter onto the list. We now have SMP OLPC machines, so
	101	* locking is pretty critical.
	102	*/
99ecb01c AS	103	static void queue_ec_descriptor(struct ec_cmd_desc *desc,
99ecb01c AS	104	struct olpc_ec_priv *ec)
3d26c20b AS	105	{
	106	unsigned long flags;
	107
	108	INIT_LIST_HEAD(&desc->node);
	109
99ecb01c AS	110	spin_lock_irqsave(&ec->cmd_q_lock, flags);
	111	list_add_tail(&desc->node, &ec->cmd_q);
	112	spin_unlock_irqrestore(&ec->cmd_q_lock, flags);
3d26c20b	113
99ecb01c	114	schedule_work(&ec->worker);
3d26c20b AS	115	}
3d26c20b AS	116
392a325c AS	117	int olpc_ec_cmd(u8 cmd, u8 inbuf, size_t inlen, u8 outbuf, size_t outlen)
392a325c AS	118	{
d278b7a2	119	struct olpc_ec_priv *ec = ec_priv;
3d26c20b AS	120	struct ec_cmd_desc desc;
3d26c20b AS	121
3d26c20b AS	122	/* Ensure a driver and ec hook have been registered */
	123	if (WARN_ON(!ec_driver \|\| !ec_driver->ec_cmd))
	124	return -ENODEV;
	125
d278b7a2 AS	126	if (!ec)
	127	return -ENOMEM;
	128
	129	/* Suspending in the middle of a command hoses things really badly */
	130	if (WARN_ON(ec->suspended))
	131	return -EBUSY;
	132
3d26c20b AS	133	might_sleep();
	134
	135	desc.cmd = cmd;
	136	desc.inbuf = inbuf;
	137	desc.outbuf = outbuf;
	138	desc.inlen = inlen;
	139	desc.outlen = outlen;
	140	desc.err = 0;
	141	init_completion(&desc.finished);
	142
99ecb01c	143	queue_ec_descriptor(&desc, ec);
3d26c20b AS	144
	145	/* Timeouts must be handled in the platform-specific EC hook */
	146	wait_for_completion(&desc.finished);
	147
	148	/* The worker thread dequeues the cmd; no need to do anything here */
	149	return desc.err;
392a325c AS	150	}
392a325c AS	151	EXPORT_SYMBOL_GPL(olpc_ec_cmd);
ac250415	152
6cca83d4 AS	153	#ifdef CONFIG_DEBUG_FS
	154
	155	/*
	156	* debugfs support for "generic commands", to allow sending
	157	* arbitrary EC commands from userspace.
	158	*/
	159
	160	#define EC_MAX_CMD_ARGS (5 + 1) /* cmd byte + 5 args */
	161	#define EC_MAX_CMD_REPLY (8)
	162
	163	static DEFINE_MUTEX(ec_dbgfs_lock);
	164	static unsigned char ec_dbgfs_resp[EC_MAX_CMD_REPLY];
	165	static unsigned int ec_dbgfs_resp_bytes;
	166
	167	static ssize_t ec_dbgfs_cmd_write(struct file file, const char __user buf,
	168	size_t size, loff_t *ppos)
	169	{
	170	int i, m;
	171	unsigned char ec_cmd[EC_MAX_CMD_ARGS];
	172	unsigned int ec_cmd_int[EC_MAX_CMD_ARGS];
	173	char cmdbuf[64];
	174	int ec_cmd_bytes;
	175
	176	mutex_lock(&ec_dbgfs_lock);
	177
	178	size = simple_write_to_buffer(cmdbuf, sizeof(cmdbuf), ppos, buf, size);
	179
	180	m = sscanf(cmdbuf, "%x:%u %x %x %x %x %x", &ec_cmd_int[0],
	181	&ec_dbgfs_resp_bytes, &ec_cmd_int[1], &ec_cmd_int[2],
	182	&ec_cmd_int[3], &ec_cmd_int[4], &ec_cmd_int[5]);
	183	if (m < 2 \|\| ec_dbgfs_resp_bytes > EC_MAX_CMD_REPLY) {
	184	/* reset to prevent overflow on read */
	185	ec_dbgfs_resp_bytes = 0;
	186
	187	pr_debug("olpc-ec: bad ec cmd: cmd:response-count [arg1 [arg2 ...]]\n");
	188	size = -EINVAL;
	189	goto out;
	190	}
	191
	192	/* convert scanf'd ints to char */
	193	ec_cmd_bytes = m - 2;
	194	for (i = 0; i <= ec_cmd_bytes; i++)
	195	ec_cmd[i] = ec_cmd_int[i];
	196
7d3777d1 AS	197	pr_debug("olpc-ec: debugfs cmd 0x%02x with %d args %5ph, want %d returns\n",
	198	ec_cmd[0], ec_cmd_bytes, ec_cmd + 1,
	199	ec_dbgfs_resp_bytes);
6cca83d4 AS	200
	201	olpc_ec_cmd(ec_cmd[0], (ec_cmd_bytes == 0) ? NULL : &ec_cmd[1],
	202	ec_cmd_bytes, ec_dbgfs_resp, ec_dbgfs_resp_bytes);
	203
7d3777d1 AS	204	pr_debug("olpc-ec: response %8ph (%d bytes expected)\n",
7d3777d1 AS	205	ec_dbgfs_resp, ec_dbgfs_resp_bytes);
6cca83d4 AS	206
	207	out:
	208	mutex_unlock(&ec_dbgfs_lock);
	209	return size;
	210	}
	211
	212	static ssize_t ec_dbgfs_cmd_read(struct file file, char __user buf,
	213	size_t size, loff_t *ppos)
	214	{
	215	unsigned int i, r;
	216	char *rp;
	217	char respbuf[64];
	218
	219	mutex_lock(&ec_dbgfs_lock);
	220	rp = respbuf;
	221	rp += sprintf(rp, "%02x", ec_dbgfs_resp[0]);
	222	for (i = 1; i < ec_dbgfs_resp_bytes; i++)
	223	rp += sprintf(rp, ", %02x", ec_dbgfs_resp[i]);
	224	mutex_unlock(&ec_dbgfs_lock);
	225	rp += sprintf(rp, "\n");
	226
	227	r = rp - respbuf;
	228	return simple_read_from_buffer(buf, size, ppos, respbuf, r);
	229	}
	230
	231	static const struct file_operations ec_dbgfs_ops = {
	232	.write = ec_dbgfs_cmd_write,
	233	.read = ec_dbgfs_cmd_read,
	234	};
	235
	236	static struct dentry *olpc_ec_setup_debugfs(void)
	237	{
	238	struct dentry *dbgfs_dir;
	239
	240	dbgfs_dir = debugfs_create_dir("olpc-ec", NULL);
	241	if (IS_ERR_OR_NULL(dbgfs_dir))
	242	return NULL;
	243
	244	debugfs_create_file("cmd", 0600, dbgfs_dir, NULL, &ec_dbgfs_ops);
	245
	246	return dbgfs_dir;
	247	}
	248
	249	#else
	250
	251	static struct dentry *olpc_ec_setup_debugfs(void)
	252	{
	253	return NULL;
	254	}
	255
	256	#endif /* CONFIG_DEBUG_FS */
	257
ac250415 AS	258	static int olpc_ec_probe(struct platform_device *pdev)
ac250415 AS	259	{
d278b7a2	260	struct olpc_ec_priv *ec;
ac250415 AS	261	int err;
	262
	263	if (!ec_driver)
	264	return -ENODEV;
	265
d278b7a2 AS	266	ec = kzalloc(sizeof(*ec), GFP_KERNEL);
	267	if (!ec)
	268	return -ENOMEM;
99ecb01c	269
d278b7a2	270	ec->drv = ec_driver;
99ecb01c AS	271	INIT_WORK(&ec->worker, olpc_ec_worker);
	272	mutex_init(&ec->cmd_lock);
	273
	274	INIT_LIST_HEAD(&ec->cmd_q);
	275	spin_lock_init(&ec->cmd_q_lock);
	276
d278b7a2 AS	277	ec_priv = ec;
	278	platform_set_drvdata(pdev, ec);
	279
ac250415	280	err = ec_driver->probe ? ec_driver->probe(pdev) : 0;
6cca83d4 AS	281	if (err) {
	282	ec_priv = NULL;
	283	kfree(ec);
	284	} else {
	285	ec->dbgfs_dir = olpc_ec_setup_debugfs();
	286	}
ac250415 AS	287
	288	return err;
	289	}
	290
	291	static int olpc_ec_suspend(struct device *dev)
	292	{
	293	struct platform_device *pdev = to_platform_device(dev);
d278b7a2 AS	294	struct olpc_ec_priv *ec = platform_get_drvdata(pdev);
	295	int err = 0;
	296
	297	if (ec_driver->suspend)
	298	err = ec_driver->suspend(pdev);
	299	if (!err)
	300	ec->suspended = true;
	301
	302	return err;
ac250415 AS	303	}
	304
	305	static int olpc_ec_resume(struct device *dev)
	306	{
	307	struct platform_device *pdev = to_platform_device(dev);
d278b7a2 AS	308	struct olpc_ec_priv *ec = platform_get_drvdata(pdev);
	309
	310	ec->suspended = false;
ac250415 AS	311	return ec_driver->resume ? ec_driver->resume(pdev) : 0;
	312	}
	313
	314	static const struct dev_pm_ops olpc_ec_pm_ops = {
	315	.suspend_late = olpc_ec_suspend,
	316	.resume_early = olpc_ec_resume,
	317	};
	318
	319	static struct platform_driver olpc_ec_plat_driver = {
	320	.probe = olpc_ec_probe,
	321	.driver = {
	322	.name = "olpc-ec",
	323	.pm = &olpc_ec_pm_ops,
	324	},
	325	};
	326
	327	static int __init olpc_ec_init_module(void)
	328	{
	329	return platform_driver_register(&olpc_ec_plat_driver);
	330	}
93dbc1b3	331	arch_initcall(olpc_ec_init_module);