2 * ChromeOS EC multi-function device
4 * Copyright (C) 2012 Google, Inc
6 * This software is licensed under the terms of the GNU General Public
7 * License version 2, as published by the Free Software Foundation, and
8 * may be copied, distributed, and modified under those terms.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * The ChromeOS EC multi function device is used to mux all the requests
16 * to the EC device for its multiple features: keyboard controller,
17 * battery charging and regulator control, firmware update.
20 #include <linux/of_platform.h>
21 #include <linux/interrupt.h>
22 #include <linux/slab.h>
23 #include <linux/module.h>
24 #include <linux/mfd/core.h>
25 #include <linux/mfd/cros_ec.h>
27 static const struct mfd_cell cros_devs[] = {
29 .name = "cros-ec-ctl",
30 .id = PLATFORM_DEVID_AUTO,
34 int cros_ec_register(struct cros_ec_device *ec_dev)
36 struct device *dev = ec_dev->dev;
39 if (ec_dev->din_size) {
40 ec_dev->din = devm_kzalloc(dev, ec_dev->din_size, GFP_KERNEL);
44 if (ec_dev->dout_size) {
45 ec_dev->dout = devm_kzalloc(dev, ec_dev->dout_size, GFP_KERNEL);
50 mutex_init(&ec_dev->lock);
52 err = mfd_add_devices(dev, 0, cros_devs,
53 ARRAY_SIZE(cros_devs),
54 NULL, ec_dev->irq, NULL);
56 dev_err(dev, "failed to add mfd devices\n");
60 if (IS_ENABLED(CONFIG_OF) && dev->of_node) {
61 err = of_platform_populate(dev->of_node, NULL, NULL, dev);
63 mfd_remove_devices(dev);
64 dev_err(dev, "Failed to register sub-devices\n");
69 dev_info(dev, "Chrome EC device registered\n");
73 EXPORT_SYMBOL(cros_ec_register);
75 int cros_ec_remove(struct cros_ec_device *ec_dev)
77 mfd_remove_devices(ec_dev->dev);
81 EXPORT_SYMBOL(cros_ec_remove);
83 #ifdef CONFIG_PM_SLEEP
84 int cros_ec_suspend(struct cros_ec_device *ec_dev)
86 struct device *dev = ec_dev->dev;
88 if (device_may_wakeup(dev))
89 ec_dev->wake_enabled = !enable_irq_wake(ec_dev->irq);
91 disable_irq(ec_dev->irq);
92 ec_dev->was_wake_device = ec_dev->wake_enabled;
96 EXPORT_SYMBOL(cros_ec_suspend);
98 int cros_ec_resume(struct cros_ec_device *ec_dev)
100 enable_irq(ec_dev->irq);
102 if (ec_dev->wake_enabled) {
103 disable_irq_wake(ec_dev->irq);
104 ec_dev->wake_enabled = 0;
109 EXPORT_SYMBOL(cros_ec_resume);
113 MODULE_LICENSE("GPL");
114 MODULE_DESCRIPTION("ChromeOS EC core driver");