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4ab6174e SG |
1 | /* |
2 | * ChromeOS EC multi-function device | |
3 | * | |
4 | * Copyright (C) 2012 Google, Inc | |
5 | * | |
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. | |
9 | * | |
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. | |
14 | * | |
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. | |
18 | */ | |
19 | ||
bb03ffb9 | 20 | #include <linux/of_platform.h> |
4ab6174e SG |
21 | #include <linux/interrupt.h> |
22 | #include <linux/slab.h> | |
5ebeaff5 | 23 | #include <linux/module.h> |
4ab6174e SG |
24 | #include <linux/mfd/core.h> |
25 | #include <linux/mfd/cros_ec.h> | |
a6551a76 | 26 | |
5ac98553 | 27 | static const struct mfd_cell cros_devs[] = { |
8a4be850 JMC |
28 | { |
29 | .name = "cros-ec-ctl", | |
bb03ffb9 | 30 | .id = PLATFORM_DEVID_AUTO, |
8a4be850 | 31 | }, |
4ab6174e SG |
32 | }; |
33 | ||
34 | int cros_ec_register(struct cros_ec_device *ec_dev) | |
35 | { | |
36 | struct device *dev = ec_dev->dev; | |
37 | int err = 0; | |
38 | ||
2c7589af SB |
39 | ec_dev->max_request = sizeof(struct ec_params_hello); |
40 | ec_dev->max_response = sizeof(struct ec_response_get_protocol_info); | |
41 | ec_dev->max_passthru = 0; | |
42 | ||
43 | ec_dev->din = devm_kzalloc(dev, ec_dev->din_size, GFP_KERNEL); | |
44 | if (!ec_dev->din) | |
45 | return -ENOMEM; | |
46 | ||
47 | ec_dev->dout = devm_kzalloc(dev, ec_dev->dout_size, GFP_KERNEL); | |
48 | if (!ec_dev->dout) | |
49 | return -ENOMEM; | |
4ab6174e | 50 | |
63427530 AB |
51 | mutex_init(&ec_dev->lock); |
52 | ||
2c7589af SB |
53 | cros_ec_query_all(ec_dev); |
54 | ||
4ab6174e SG |
55 | err = mfd_add_devices(dev, 0, cros_devs, |
56 | ARRAY_SIZE(cros_devs), | |
57 | NULL, ec_dev->irq, NULL); | |
58 | if (err) { | |
59 | dev_err(dev, "failed to add mfd devices\n"); | |
d1fd345e | 60 | return err; |
4ab6174e SG |
61 | } |
62 | ||
bb03ffb9 TB |
63 | if (IS_ENABLED(CONFIG_OF) && dev->of_node) { |
64 | err = of_platform_populate(dev->of_node, NULL, NULL, dev); | |
65 | if (err) { | |
66 | mfd_remove_devices(dev); | |
67 | dev_err(dev, "Failed to register sub-devices\n"); | |
68 | return err; | |
69 | } | |
70 | } | |
71 | ||
533cec8f | 72 | dev_info(dev, "Chrome EC device registered\n"); |
4ab6174e SG |
73 | |
74 | return 0; | |
4ab6174e | 75 | } |
5ebeaff5 | 76 | EXPORT_SYMBOL(cros_ec_register); |
4ab6174e SG |
77 | |
78 | int cros_ec_remove(struct cros_ec_device *ec_dev) | |
79 | { | |
80 | mfd_remove_devices(ec_dev->dev); | |
4ab6174e SG |
81 | |
82 | return 0; | |
83 | } | |
5ebeaff5 | 84 | EXPORT_SYMBOL(cros_ec_remove); |
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85 | |
86 | #ifdef CONFIG_PM_SLEEP | |
87 | int cros_ec_suspend(struct cros_ec_device *ec_dev) | |
88 | { | |
89 | struct device *dev = ec_dev->dev; | |
90 | ||
91 | if (device_may_wakeup(dev)) | |
92 | ec_dev->wake_enabled = !enable_irq_wake(ec_dev->irq); | |
93 | ||
94 | disable_irq(ec_dev->irq); | |
95 | ec_dev->was_wake_device = ec_dev->wake_enabled; | |
96 | ||
97 | return 0; | |
98 | } | |
5ebeaff5 | 99 | EXPORT_SYMBOL(cros_ec_suspend); |
4ab6174e SG |
100 | |
101 | int cros_ec_resume(struct cros_ec_device *ec_dev) | |
102 | { | |
103 | enable_irq(ec_dev->irq); | |
104 | ||
105 | if (ec_dev->wake_enabled) { | |
106 | disable_irq_wake(ec_dev->irq); | |
107 | ec_dev->wake_enabled = 0; | |
108 | } | |
109 | ||
110 | return 0; | |
111 | } | |
5ebeaff5 SO |
112 | EXPORT_SYMBOL(cros_ec_resume); |
113 | ||
4ab6174e | 114 | #endif |
a865a589 BR |
115 | |
116 | MODULE_LICENSE("GPL"); | |
117 | MODULE_DESCRIPTION("ChromeOS EC core driver"); |