Commit | Line | Data |
---|---|---|
a3c89334 AL |
1 | /* |
2 | * INT3406 thermal driver for display participant device | |
3 | * | |
4 | * Copyright (C) 2016, Intel Corporation | |
5 | * Authors: Aaron Lu <aaron.lu@intel.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | * | |
11 | */ | |
12 | ||
13 | #include <linux/module.h> | |
14 | #include <linux/platform_device.h> | |
15 | #include <linux/acpi.h> | |
16 | #include <linux/backlight.h> | |
17 | #include <linux/thermal.h> | |
18 | #include <acpi/video.h> | |
19 | ||
20 | #define INT3406_BRIGHTNESS_LIMITS_CHANGED 0x80 | |
21 | ||
22 | struct int3406_thermal_data { | |
23 | int upper_limit; | |
24 | int upper_limit_index; | |
25 | int lower_limit; | |
26 | int lower_limit_index; | |
27 | acpi_handle handle; | |
28 | struct acpi_video_device_brightness *br; | |
29 | struct backlight_device *raw_bd; | |
30 | struct thermal_cooling_device *cooling_dev; | |
31 | }; | |
32 | ||
33 | static int int3406_thermal_to_raw(int level, struct int3406_thermal_data *d) | |
34 | { | |
35 | int max_level = d->br->levels[d->br->count - 1]; | |
36 | int raw_max = d->raw_bd->props.max_brightness; | |
37 | ||
38 | return level * raw_max / max_level; | |
39 | } | |
40 | ||
41 | static int int3406_thermal_to_acpi(int level, struct int3406_thermal_data *d) | |
42 | { | |
43 | int raw_max = d->raw_bd->props.max_brightness; | |
44 | int max_level = d->br->levels[d->br->count - 1]; | |
45 | ||
46 | return level * max_level / raw_max; | |
47 | } | |
48 | ||
49 | static int | |
50 | int3406_thermal_get_max_state(struct thermal_cooling_device *cooling_dev, | |
51 | unsigned long *state) | |
52 | { | |
53 | struct int3406_thermal_data *d = cooling_dev->devdata; | |
54 | int index = d->lower_limit_index ? d->lower_limit_index : 2; | |
55 | ||
56 | *state = d->br->count - 1 - index; | |
57 | return 0; | |
58 | } | |
59 | ||
60 | static int | |
61 | int3406_thermal_set_cur_state(struct thermal_cooling_device *cooling_dev, | |
62 | unsigned long state) | |
63 | { | |
64 | struct int3406_thermal_data *d = cooling_dev->devdata; | |
65 | int level, raw_level; | |
66 | ||
67 | if (state > d->br->count - 3) | |
68 | return -EINVAL; | |
69 | ||
70 | state = d->br->count - 1 - state; | |
71 | level = d->br->levels[state]; | |
72 | ||
73 | if ((d->upper_limit && level > d->upper_limit) || | |
74 | (d->lower_limit && level < d->lower_limit)) | |
75 | return -EINVAL; | |
76 | ||
77 | raw_level = int3406_thermal_to_raw(level, d); | |
78 | return backlight_device_set_brightness(d->raw_bd, raw_level); | |
79 | } | |
80 | ||
81 | static int | |
82 | int3406_thermal_get_cur_state(struct thermal_cooling_device *cooling_dev, | |
83 | unsigned long *state) | |
84 | { | |
85 | struct int3406_thermal_data *d = cooling_dev->devdata; | |
86 | int raw_level, level, i; | |
87 | int *levels = d->br->levels; | |
88 | ||
89 | raw_level = d->raw_bd->props.brightness; | |
90 | level = int3406_thermal_to_acpi(raw_level, d); | |
91 | ||
92 | /* | |
93 | * There is no 1:1 mapping between the firmware interface level with the | |
94 | * raw interface level, we will have to find one that is close enough. | |
95 | */ | |
96 | for (i = 2; i < d->br->count; i++) { | |
97 | if (level < levels[i]) { | |
98 | if (i == 2) | |
99 | break; | |
100 | if ((level - levels[i - 1]) < (levels[i] - level)) | |
101 | i--; | |
102 | break; | |
103 | } | |
104 | } | |
105 | ||
106 | *state = d->br->count - 1 - i; | |
107 | return 0; | |
108 | } | |
109 | ||
110 | static const struct thermal_cooling_device_ops video_cooling_ops = { | |
111 | .get_max_state = int3406_thermal_get_max_state, | |
112 | .get_cur_state = int3406_thermal_get_cur_state, | |
113 | .set_cur_state = int3406_thermal_set_cur_state, | |
114 | }; | |
115 | ||
116 | static int int3406_thermal_get_index(int *array, int nr, int value) | |
117 | { | |
118 | int i; | |
119 | ||
120 | for (i = 0; i < nr; i++) { | |
121 | if (array[i] == value) | |
122 | break; | |
123 | } | |
124 | return i == nr ? -ENOENT : i; | |
125 | } | |
126 | ||
127 | static void int3406_thermal_get_limit(struct int3406_thermal_data *d) | |
128 | { | |
129 | acpi_status status; | |
130 | unsigned long long lower_limit, upper_limit; | |
131 | int index; | |
132 | ||
133 | status = acpi_evaluate_integer(d->handle, "DDDL", NULL, &lower_limit); | |
134 | if (ACPI_SUCCESS(status)) { | |
135 | index = int3406_thermal_get_index(d->br->levels, d->br->count, | |
136 | lower_limit); | |
137 | if (index > 0) { | |
138 | d->lower_limit = (int)lower_limit; | |
139 | d->lower_limit_index = index; | |
140 | } | |
141 | } | |
142 | ||
143 | status = acpi_evaluate_integer(d->handle, "DDPC", NULL, &upper_limit); | |
144 | if (ACPI_SUCCESS(status)) { | |
145 | index = int3406_thermal_get_index(d->br->levels, d->br->count, | |
146 | upper_limit); | |
147 | if (index > 0) { | |
148 | d->upper_limit = (int)upper_limit; | |
149 | d->upper_limit_index = index; | |
150 | } | |
151 | } | |
152 | } | |
153 | ||
154 | static void int3406_notify(acpi_handle handle, u32 event, void *data) | |
155 | { | |
156 | if (event == INT3406_BRIGHTNESS_LIMITS_CHANGED) | |
157 | int3406_thermal_get_limit(data); | |
158 | } | |
159 | ||
160 | static int int3406_thermal_probe(struct platform_device *pdev) | |
161 | { | |
162 | struct acpi_device *adev = ACPI_COMPANION(&pdev->dev); | |
163 | struct int3406_thermal_data *d; | |
164 | struct backlight_device *bd; | |
165 | int ret; | |
166 | ||
167 | if (!ACPI_HANDLE(&pdev->dev)) | |
168 | return -ENODEV; | |
169 | ||
170 | d = devm_kzalloc(&pdev->dev, sizeof(*d), GFP_KERNEL); | |
171 | if (!d) | |
172 | return -ENOMEM; | |
173 | d->handle = ACPI_HANDLE(&pdev->dev); | |
174 | ||
175 | bd = backlight_device_get_by_type(BACKLIGHT_RAW); | |
176 | if (!bd) | |
177 | return -ENODEV; | |
178 | d->raw_bd = bd; | |
179 | ||
9f9cd7ee | 180 | ret = acpi_video_get_levels(ACPI_COMPANION(&pdev->dev), &d->br, NULL); |
a3c89334 AL |
181 | if (ret) |
182 | return ret; | |
183 | ||
184 | int3406_thermal_get_limit(d); | |
185 | ||
186 | d->cooling_dev = thermal_cooling_device_register(acpi_device_bid(adev), | |
187 | d, &video_cooling_ops); | |
188 | if (IS_ERR(d->cooling_dev)) | |
189 | goto err; | |
190 | ||
191 | ret = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY, | |
192 | int3406_notify, d); | |
193 | if (ret) | |
194 | goto err_cdev; | |
195 | ||
196 | platform_set_drvdata(pdev, d); | |
197 | ||
198 | return 0; | |
199 | ||
200 | err_cdev: | |
201 | thermal_cooling_device_unregister(d->cooling_dev); | |
202 | err: | |
203 | kfree(d->br); | |
204 | return -ENODEV; | |
205 | } | |
206 | ||
207 | static int int3406_thermal_remove(struct platform_device *pdev) | |
208 | { | |
209 | struct int3406_thermal_data *d = platform_get_drvdata(pdev); | |
210 | ||
211 | thermal_cooling_device_unregister(d->cooling_dev); | |
212 | kfree(d->br); | |
213 | return 0; | |
214 | } | |
215 | ||
216 | static const struct acpi_device_id int3406_thermal_match[] = { | |
217 | {"INT3406", 0}, | |
218 | {} | |
219 | }; | |
220 | ||
221 | MODULE_DEVICE_TABLE(acpi, int3406_thermal_match); | |
222 | ||
223 | static struct platform_driver int3406_thermal_driver = { | |
224 | .probe = int3406_thermal_probe, | |
225 | .remove = int3406_thermal_remove, | |
226 | .driver = { | |
227 | .name = "int3406 thermal", | |
a3c89334 AL |
228 | .acpi_match_table = int3406_thermal_match, |
229 | }, | |
230 | }; | |
231 | ||
232 | module_platform_driver(int3406_thermal_driver); | |
233 | ||
234 | MODULE_DESCRIPTION("INT3406 Thermal driver"); | |
235 | MODULE_LICENSE("GPL v2"); |