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1 | /* |
2 | * ChromeOS EC multi-function device | |
3 | * | |
4 | * Copyright (C) 2017 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 | #include <linux/acpi.h> | |
20 | ||
21 | #define ACPI_LID_DEVICE "LID0" | |
22 | ||
23 | static int ec_wake_gpe = -EINVAL; | |
24 | ||
25 | /* | |
26 | * This handler indicates to ACPI core that this GPE should stay enabled for | |
27 | * lid to work in suspend to idle path. | |
28 | */ | |
29 | static u32 cros_ec_gpe_handler(acpi_handle gpe_device, u32 gpe_number, | |
30 | void *data) | |
31 | { | |
32 | return ACPI_INTERRUPT_HANDLED | ACPI_REENABLE_GPE; | |
33 | } | |
34 | ||
35 | /* | |
36 | * Get ACPI GPE for LID0 device. | |
37 | */ | |
38 | static int cros_ec_get_ec_wake_gpe(struct device *dev) | |
39 | { | |
40 | struct acpi_device *cros_acpi_dev; | |
41 | struct acpi_device *adev; | |
42 | acpi_handle handle; | |
43 | acpi_status status; | |
44 | int ret; | |
45 | ||
46 | cros_acpi_dev = ACPI_COMPANION(dev); | |
47 | ||
48 | if (!cros_acpi_dev || !cros_acpi_dev->parent || | |
49 | !cros_acpi_dev->parent->handle) | |
50 | return -EINVAL; | |
51 | ||
52 | status = acpi_get_handle(cros_acpi_dev->parent->handle, ACPI_LID_DEVICE, | |
53 | &handle); | |
54 | if (ACPI_FAILURE(status)) | |
55 | return -EINVAL; | |
56 | ||
57 | ret = acpi_bus_get_device(handle, &adev); | |
58 | if (ret) | |
59 | return ret; | |
60 | ||
61 | return adev->wakeup.gpe_number; | |
62 | } | |
63 | ||
64 | int cros_ec_acpi_install_gpe_handler(struct device *dev) | |
65 | { | |
66 | acpi_status status; | |
67 | ||
68 | ec_wake_gpe = cros_ec_get_ec_wake_gpe(dev); | |
69 | ||
70 | if (ec_wake_gpe < 0) | |
71 | return ec_wake_gpe; | |
72 | ||
73 | status = acpi_install_gpe_handler(NULL, ec_wake_gpe, | |
74 | ACPI_GPE_EDGE_TRIGGERED, | |
75 | &cros_ec_gpe_handler, NULL); | |
76 | if (ACPI_FAILURE(status)) | |
77 | return -ENODEV; | |
78 | ||
79 | dev_info(dev, "Initialized, GPE = 0x%x\n", ec_wake_gpe); | |
80 | ||
81 | return 0; | |
82 | } | |
83 | ||
84 | void cros_ec_acpi_remove_gpe_handler(void) | |
85 | { | |
86 | acpi_status status; | |
87 | ||
88 | if (ec_wake_gpe < 0) | |
89 | return; | |
90 | ||
91 | status = acpi_remove_gpe_handler(NULL, ec_wake_gpe, | |
92 | &cros_ec_gpe_handler); | |
93 | if (ACPI_FAILURE(status)) | |
94 | pr_err("failed to remove gpe handler\n"); | |
95 | } | |
96 | ||
97 | void cros_ec_acpi_clear_gpe(void) | |
98 | { | |
99 | if (ec_wake_gpe < 0) | |
100 | return; | |
101 | ||
102 | acpi_clear_gpe(NULL, ec_wake_gpe); | |
103 | } |