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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 | ||
20 | #include <linux/interrupt.h> | |
21 | #include <linux/slab.h> | |
5ebeaff5 | 22 | #include <linux/module.h> |
4ab6174e SG |
23 | #include <linux/mfd/core.h> |
24 | #include <linux/mfd/cros_ec.h> | |
25 | #include <linux/mfd/cros_ec_commands.h> | |
26 | ||
27 | int cros_ec_prepare_tx(struct cros_ec_device *ec_dev, | |
5d4773e2 | 28 | struct cros_ec_command *msg) |
4ab6174e SG |
29 | { |
30 | uint8_t *out; | |
31 | int csum, i; | |
32 | ||
5d4773e2 | 33 | BUG_ON(msg->outsize > EC_PROTO2_MAX_PARAM_SIZE); |
4ab6174e SG |
34 | out = ec_dev->dout; |
35 | out[0] = EC_CMD_VERSION0 + msg->version; | |
5d4773e2 BR |
36 | out[1] = msg->command; |
37 | out[2] = msg->outsize; | |
4ab6174e | 38 | csum = out[0] + out[1] + out[2]; |
5d4773e2 BR |
39 | for (i = 0; i < msg->outsize; i++) |
40 | csum += out[EC_MSG_TX_HEADER_BYTES + i] = msg->outdata[i]; | |
41 | out[EC_MSG_TX_HEADER_BYTES + msg->outsize] = (uint8_t)(csum & 0xff); | |
4ab6174e | 42 | |
5d4773e2 | 43 | return EC_MSG_TX_PROTO_BYTES + msg->outsize; |
4ab6174e | 44 | } |
5ebeaff5 | 45 | EXPORT_SYMBOL(cros_ec_prepare_tx); |
4ab6174e | 46 | |
6db07b63 BR |
47 | int cros_ec_check_result(struct cros_ec_device *ec_dev, |
48 | struct cros_ec_command *msg) | |
49 | { | |
50 | switch (msg->result) { | |
51 | case EC_RES_SUCCESS: | |
52 | return 0; | |
53 | case EC_RES_IN_PROGRESS: | |
54 | dev_dbg(ec_dev->dev, "command 0x%02x in progress\n", | |
55 | msg->command); | |
56 | return -EAGAIN; | |
57 | default: | |
58 | dev_dbg(ec_dev->dev, "command 0x%02x returned %d\n", | |
59 | msg->command, msg->result); | |
60 | return 0; | |
61 | } | |
62 | } | |
63 | EXPORT_SYMBOL(cros_ec_check_result); | |
64 | ||
5ac98553 | 65 | static const struct mfd_cell cros_devs[] = { |
4ab6174e SG |
66 | { |
67 | .name = "cros-ec-keyb", | |
68 | .id = 1, | |
69 | .of_compatible = "google,cros-ec-keyb", | |
70 | }, | |
9d230c9e DA |
71 | { |
72 | .name = "cros-ec-i2c-tunnel", | |
73 | .id = 2, | |
74 | .of_compatible = "google,cros-ec-i2c-tunnel", | |
75 | }, | |
4ab6174e SG |
76 | }; |
77 | ||
78 | int cros_ec_register(struct cros_ec_device *ec_dev) | |
79 | { | |
80 | struct device *dev = ec_dev->dev; | |
81 | int err = 0; | |
82 | ||
4ab6174e | 83 | if (ec_dev->din_size) { |
22f9ee75 LJ |
84 | ec_dev->din = devm_kzalloc(dev, ec_dev->din_size, GFP_KERNEL); |
85 | if (!ec_dev->din) | |
86 | return -ENOMEM; | |
4ab6174e SG |
87 | } |
88 | if (ec_dev->dout_size) { | |
22f9ee75 LJ |
89 | ec_dev->dout = devm_kzalloc(dev, ec_dev->dout_size, GFP_KERNEL); |
90 | if (!ec_dev->dout) | |
91 | return -ENOMEM; | |
4ab6174e SG |
92 | } |
93 | ||
4ab6174e SG |
94 | err = mfd_add_devices(dev, 0, cros_devs, |
95 | ARRAY_SIZE(cros_devs), | |
96 | NULL, ec_dev->irq, NULL); | |
97 | if (err) { | |
98 | dev_err(dev, "failed to add mfd devices\n"); | |
d1fd345e | 99 | return err; |
4ab6174e SG |
100 | } |
101 | ||
533cec8f | 102 | dev_info(dev, "Chrome EC device registered\n"); |
4ab6174e SG |
103 | |
104 | return 0; | |
4ab6174e | 105 | } |
5ebeaff5 | 106 | EXPORT_SYMBOL(cros_ec_register); |
4ab6174e SG |
107 | |
108 | int cros_ec_remove(struct cros_ec_device *ec_dev) | |
109 | { | |
110 | mfd_remove_devices(ec_dev->dev); | |
4ab6174e SG |
111 | |
112 | return 0; | |
113 | } | |
5ebeaff5 | 114 | EXPORT_SYMBOL(cros_ec_remove); |
4ab6174e SG |
115 | |
116 | #ifdef CONFIG_PM_SLEEP | |
117 | int cros_ec_suspend(struct cros_ec_device *ec_dev) | |
118 | { | |
119 | struct device *dev = ec_dev->dev; | |
120 | ||
121 | if (device_may_wakeup(dev)) | |
122 | ec_dev->wake_enabled = !enable_irq_wake(ec_dev->irq); | |
123 | ||
124 | disable_irq(ec_dev->irq); | |
125 | ec_dev->was_wake_device = ec_dev->wake_enabled; | |
126 | ||
127 | return 0; | |
128 | } | |
5ebeaff5 | 129 | EXPORT_SYMBOL(cros_ec_suspend); |
4ab6174e SG |
130 | |
131 | int cros_ec_resume(struct cros_ec_device *ec_dev) | |
132 | { | |
133 | enable_irq(ec_dev->irq); | |
134 | ||
135 | if (ec_dev->wake_enabled) { | |
136 | disable_irq_wake(ec_dev->irq); | |
137 | ec_dev->wake_enabled = 0; | |
138 | } | |
139 | ||
140 | return 0; | |
141 | } | |
5ebeaff5 SO |
142 | EXPORT_SYMBOL(cros_ec_resume); |
143 | ||
4ab6174e | 144 | #endif |
a865a589 BR |
145 | |
146 | MODULE_LICENSE("GPL"); | |
147 | MODULE_DESCRIPTION("ChromeOS EC core driver"); |