Release 4.10 drivers/mfd/cros_ec.c

/*
 * ChromeOS EC multi-function device
 *
 * Copyright (C) 2012 Google, Inc
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * 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.
 *
 * The ChromeOS EC multi function device is used to mux all the requests
 * to the EC device for its multiple features: keyboard controller,
 * battery charging and regulator control, firmware update.
 */

#include <linux/of_platform.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/mfd/core.h>
#include <linux/mfd/cros_ec.h>
#include <asm/unaligned.h>


#define CROS_EC_DEV_EC_INDEX 0

#define CROS_EC_DEV_PD_INDEX 1


static struct cros_ec_platform ec_p = {
	.ec_name = CROS_EC_DEV_NAME,
	.cmd_offset = EC_CMD_PASSTHRU_OFFSET(CROS_EC_DEV_EC_INDEX),
};


static struct cros_ec_platform pd_p = {
	.ec_name = CROS_EC_DEV_PD_NAME,
	.cmd_offset = EC_CMD_PASSTHRU_OFFSET(CROS_EC_DEV_PD_INDEX),
};


static const struct mfd_cell ec_cell = {
	.name = "cros-ec-ctl",
	.platform_data = &ec_p,
	.pdata_size = sizeof(ec_p),
};


static const struct mfd_cell ec_pd_cell = {
	.name = "cros-ec-ctl",
	.platform_data = &pd_p,
	.pdata_size = sizeof(pd_p),
};



static irqreturn_t ec_irq_thread(int irq, void *data)
{
	struct cros_ec_device *ec_dev = data;
	int ret;

	if (device_may_wakeup(ec_dev->dev))
		pm_wakeup_event(ec_dev->dev, 0);

	ret = cros_ec_get_next_event(ec_dev);
	if (ret > 0)
		blocking_notifier_call_chain(&ec_dev->event_notifier,
					     0, ec_dev);
	return IRQ_HANDLED;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
vic yang
vic yang
69
100.00%
1
100.00%
Total
69
100.00%
1
100.00%



int cros_ec_register(struct cros_ec_device *ec_dev)
{
	struct device *dev = ec_dev->dev;
	int err = 0;

	BLOCKING_INIT_NOTIFIER_HEAD(&ec_dev->event_notifier);

	ec_dev->max_request = sizeof(struct ec_params_hello);
	ec_dev->max_response = sizeof(struct ec_response_get_protocol_info);
	ec_dev->max_passthru = 0;

	ec_dev->din = devm_kzalloc(dev, ec_dev->din_size, GFP_KERNEL);
	if (!ec_dev->din)
		return -ENOMEM;

	ec_dev->dout = devm_kzalloc(dev, ec_dev->dout_size, GFP_KERNEL);
	if (!ec_dev->dout)
		return -ENOMEM;

	mutex_init(&ec_dev->lock);

	cros_ec_query_all(ec_dev);

	if (ec_dev->irq) {
		err = request_threaded_irq(ec_dev->irq, NULL, ec_irq_thread,
					   IRQF_TRIGGER_LOW | IRQF_ONESHOT,
					   "chromeos-ec", ec_dev);
		if (err) {
			dev_err(dev, "Failed to request IRQ %d: %d",
				ec_dev->irq, err);
			return err;
		}
	}

	err = mfd_add_devices(ec_dev->dev, PLATFORM_DEVID_AUTO, &ec_cell, 1,
			      NULL, ec_dev->irq, NULL);
	if (err) {
		dev_err(dev,
			"Failed to register Embedded Controller subdevice %d\n",
			err);
		goto fail_mfd;
	}

	if (ec_dev->max_passthru) {
		/*
                 * Register a PD device as well on top of this device.
                 * We make the following assumptions:
                 * - behind an EC, we have a pd
                 * - only one device added.
                 * - the EC is responsive at init time (it is not true for a
                 *   sensor hub.
                 */
		err = mfd_add_devices(ec_dev->dev, PLATFORM_DEVID_AUTO,
				      &ec_pd_cell, 1, NULL, ec_dev->irq, NULL);
		if (err) {
			dev_err(dev,
				"Failed to register Power Delivery subdevice %d\n",
				err);
			goto fail_mfd;
		}
	}

	if (IS_ENABLED(CONFIG_OF) && dev->of_node) {
		err = of_platform_populate(dev->of_node, NULL, NULL, dev);
		if (err) {
			mfd_remove_devices(dev);
			dev_err(dev, "Failed to register sub-devices\n");
			goto fail_mfd;
		}
	}

	dev_info(dev, "Chrome EC device registered\n");

	return 0;

fail_mfd:
	if (ec_dev->irq)
		free_irq(ec_dev->irq, ec_dev);
	return err;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
simon glass
simon glass
109
31.50%
1
12.50%
vic yang
vic yang
88
25.43%
1
12.50%
gwendal grignou
gwendal grignou
55
15.90%
1
12.50%
todd broch
todd broch
46
13.29%
1
12.50%
stephen barber
stephen barber
29
8.38%
1
12.50%
lee jones
lee jones
10
2.89%
1
12.50%
andrew bresticker
andrew bresticker
8
2.31%
1
12.50%
bill richardson
bill richardson
1
0.29%
1
12.50%
Total
346
100.00%
8
100.00%


EXPORT_SYMBOL(cros_ec_register);



int cros_ec_remove(struct cros_ec_device *ec_dev)
{
	mfd_remove_devices(ec_dev->dev);

	return 0;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
simon glass
simon glass
20
100.00%
1
100.00%
Total
20
100.00%
1
100.00%


EXPORT_SYMBOL(cros_ec_remove);

#ifdef CONFIG_PM_SLEEP


int cros_ec_suspend(struct cros_ec_device *ec_dev)
{
	struct device *dev = ec_dev->dev;

	if (device_may_wakeup(dev))
		ec_dev->wake_enabled = !enable_irq_wake(ec_dev->irq);

	disable_irq(ec_dev->irq);
	ec_dev->was_wake_device = ec_dev->wake_enabled;

	return 0;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
simon glass
simon glass
56
100.00%
1
100.00%
Total
56
100.00%
1
100.00%


EXPORT_SYMBOL(cros_ec_suspend);



static void cros_ec_drain_events(struct cros_ec_device *ec_dev)
{
	while (cros_ec_get_next_event(ec_dev) > 0)
		blocking_notifier_call_chain(&ec_dev->event_notifier,
					     1, ec_dev);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
vic yang
vic yang
32
100.00%
1
100.00%
Total
32
100.00%
1
100.00%



int cros_ec_resume(struct cros_ec_device *ec_dev)
{
	enable_irq(ec_dev->irq);

	/*
         * In some cases, we need to distinguish between events that occur
         * during suspend if the EC is not a wake source. For example,
         * keypresses during suspend should be discarded if it does not wake
         * the system.
         *
         * If the EC is not a wake source, drain the event queue and mark them
         * as "queued during suspend".
         */
	if (ec_dev->wake_enabled) {
		disable_irq_wake(ec_dev->irq);
		ec_dev->wake_enabled = 0;
	} else {
		cros_ec_drain_events(ec_dev);
	}

	return 0;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
simon glass
simon glass
41
82.00%
1
50.00%
vic yang
vic yang
9
18.00%
1
50.00%
Total
50
100.00%
2
100.00%


EXPORT_SYMBOL(cros_ec_resume);

#endif

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("ChromeOS EC core driver");
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
simon glass
simon glass
254
34.70%
1
8.33%
vic yang
vic yang
201
27.46%
1
8.33%
gwendal grignou
gwendal grignou
137
18.72%
1
8.33%
todd broch
todd broch
49
6.69%
1
8.33%
stephen barber
stephen barber
29
3.96%
1
8.33%
samuel ortiz
samuel ortiz
23
3.14%
1
8.33%
lee jones
lee jones
16
2.19%
2
16.67%
bill richardson
bill richardson
11
1.50%
2
16.67%
andrew bresticker
andrew bresticker
8
1.09%
1
8.33%
javier martinez canillas
javier martinez canillas
4
0.55%
1
8.33%
Total
732
100.00%
12
100.00%
Directory: drivers/mfd

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.