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1da177e4 LT |
1 | /* |
2 | * acpi_fan.c - ACPI Fan Driver ($Revision: 29 $) | |
3 | * | |
4 | * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> | |
5 | * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> | |
6 | * | |
7 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or (at | |
12 | * your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, but | |
15 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License along | |
20 | * with this program; if not, write to the Free Software Foundation, Inc., | |
21 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. | |
22 | * | |
23 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
24 | */ | |
25 | ||
26 | #include <linux/kernel.h> | |
27 | #include <linux/module.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/types.h> | |
1da177e4 | 30 | #include <asm/uaccess.h> |
05a83d97 | 31 | #include <linux/thermal.h> |
8b48463f | 32 | #include <linux/acpi.h> |
19593a1f | 33 | #include <linux/platform_device.h> |
1da177e4 | 34 | |
f52fd66d | 35 | MODULE_AUTHOR("Paul Diefenbaugh"); |
7cda93e0 | 36 | MODULE_DESCRIPTION("ACPI Fan Driver"); |
1da177e4 LT |
37 | MODULE_LICENSE("GPL"); |
38 | ||
19593a1f AL |
39 | static int acpi_fan_probe(struct platform_device *pdev); |
40 | static int acpi_fan_remove(struct platform_device *pdev); | |
1da177e4 | 41 | |
1ba90e3a TR |
42 | static const struct acpi_device_id fan_device_ids[] = { |
43 | {"PNP0C0B", 0}, | |
44 | {"", 0}, | |
45 | }; | |
46 | MODULE_DEVICE_TABLE(acpi, fan_device_ids); | |
47 | ||
90692404 | 48 | #ifdef CONFIG_PM_SLEEP |
62fcbdd9 RW |
49 | static int acpi_fan_suspend(struct device *dev); |
50 | static int acpi_fan_resume(struct device *dev); | |
b9b8515f AL |
51 | static struct dev_pm_ops acpi_fan_pm = { |
52 | .resume = acpi_fan_resume, | |
53 | .freeze = acpi_fan_suspend, | |
54 | .thaw = acpi_fan_resume, | |
55 | .restore = acpi_fan_resume, | |
56 | }; | |
57 | #define FAN_PM_OPS_PTR (&acpi_fan_pm) | |
b108e0ea | 58 | #else |
b9b8515f | 59 | #define FAN_PM_OPS_PTR NULL |
90692404 | 60 | #endif |
62fcbdd9 | 61 | |
19593a1f AL |
62 | static struct platform_driver acpi_fan_driver = { |
63 | .probe = acpi_fan_probe, | |
64 | .remove = acpi_fan_remove, | |
65 | .driver = { | |
66 | .name = "acpi-fan", | |
67 | .acpi_match_table = fan_device_ids, | |
68 | .pm = FAN_PM_OPS_PTR, | |
69 | }, | |
1da177e4 LT |
70 | }; |
71 | ||
05a83d97 | 72 | /* thermal cooling device callbacks */ |
6503e5df MG |
73 | static int fan_get_max_state(struct thermal_cooling_device *cdev, unsigned long |
74 | *state) | |
05a83d97 ZR |
75 | { |
76 | /* ACPI fan device only support two states: ON/OFF */ | |
6503e5df MG |
77 | *state = 1; |
78 | return 0; | |
05a83d97 ZR |
79 | } |
80 | ||
6503e5df MG |
81 | static int fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long |
82 | *state) | |
05a83d97 ZR |
83 | { |
84 | struct acpi_device *device = cdev->devdata; | |
05a83d97 | 85 | int result; |
85eb9827 | 86 | int acpi_state = ACPI_STATE_D0; |
05a83d97 ZR |
87 | |
88 | if (!device) | |
89 | return -EINVAL; | |
90 | ||
2bb3a2bf | 91 | result = acpi_device_update_power(device, &acpi_state); |
05a83d97 ZR |
92 | if (result) |
93 | return result; | |
94 | ||
8ad928d5 | 95 | *state = (acpi_state == ACPI_STATE_D3_COLD ? 0 : |
6503e5df MG |
96 | (acpi_state == ACPI_STATE_D0 ? 1 : -1)); |
97 | return 0; | |
05a83d97 ZR |
98 | } |
99 | ||
100 | static int | |
6503e5df | 101 | fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state) |
05a83d97 ZR |
102 | { |
103 | struct acpi_device *device = cdev->devdata; | |
104 | int result; | |
105 | ||
106 | if (!device || (state != 0 && state != 1)) | |
107 | return -EINVAL; | |
108 | ||
2bb3a2bf | 109 | result = acpi_device_set_power(device, |
8ad928d5 | 110 | state ? ACPI_STATE_D0 : ACPI_STATE_D3_COLD); |
05a83d97 ZR |
111 | |
112 | return result; | |
113 | } | |
114 | ||
9c8b04be | 115 | static const struct thermal_cooling_device_ops fan_cooling_ops = { |
05a83d97 ZR |
116 | .get_max_state = fan_get_max_state, |
117 | .get_cur_state = fan_get_cur_state, | |
118 | .set_cur_state = fan_set_cur_state, | |
119 | }; | |
120 | ||
1da177e4 LT |
121 | /* -------------------------------------------------------------------------- |
122 | Driver Interface | |
123 | -------------------------------------------------------------------------- */ | |
124 | ||
19593a1f | 125 | static int acpi_fan_probe(struct platform_device *pdev) |
1da177e4 | 126 | { |
4be44fcd | 127 | int result = 0; |
05a83d97 | 128 | struct thermal_cooling_device *cdev; |
19593a1f | 129 | struct acpi_device *device = ACPI_COMPANION(&pdev->dev); |
1da177e4 | 130 | |
2bb3a2bf | 131 | result = acpi_device_update_power(device, NULL); |
1da177e4 | 132 | if (result) { |
19593a1f | 133 | dev_err(&pdev->dev, "Setting initial power state\n"); |
1da177e4 LT |
134 | goto end; |
135 | } | |
136 | ||
05a83d97 ZR |
137 | cdev = thermal_cooling_device_register("Fan", device, |
138 | &fan_cooling_ops); | |
19b36780 TS |
139 | if (IS_ERR(cdev)) { |
140 | result = PTR_ERR(cdev); | |
141 | goto end; | |
142 | } | |
9030062f | 143 | |
19593a1f | 144 | dev_dbg(&pdev->dev, "registered as cooling_device%d\n", cdev->id); |
9030062f | 145 | |
19593a1f AL |
146 | platform_set_drvdata(pdev, cdev); |
147 | result = sysfs_create_link(&pdev->dev.kobj, | |
9030062f JL |
148 | &cdev->device.kobj, |
149 | "thermal_cooling"); | |
150 | if (result) | |
19593a1f | 151 | dev_err(&pdev->dev, "Failed to create sysfs link " |
fc3a8828 | 152 | "'thermal_cooling'\n"); |
9030062f JL |
153 | |
154 | result = sysfs_create_link(&cdev->device.kobj, | |
19593a1f | 155 | &pdev->dev.kobj, |
9030062f JL |
156 | "device"); |
157 | if (result) | |
19593a1f | 158 | dev_err(&pdev->dev, "Failed to create sysfs link " |
fc3a8828 | 159 | "'device'\n"); |
05a83d97 | 160 | |
19593a1f | 161 | dev_info(&pdev->dev, "%s [%s] (%s)\n", |
4be44fcd LB |
162 | acpi_device_name(device), acpi_device_bid(device), |
163 | !device->power.state ? "on" : "off"); | |
1da177e4 | 164 | |
568b6ad8 | 165 | end: |
d550d98d | 166 | return result; |
1da177e4 LT |
167 | } |
168 | ||
19593a1f | 169 | static int acpi_fan_remove(struct platform_device *pdev) |
1da177e4 | 170 | { |
19593a1f | 171 | struct thermal_cooling_device *cdev = platform_get_drvdata(pdev); |
1da177e4 | 172 | |
19593a1f | 173 | sysfs_remove_link(&pdev->dev.kobj, "thermal_cooling"); |
05a83d97 ZR |
174 | sysfs_remove_link(&cdev->device.kobj, "device"); |
175 | thermal_cooling_device_unregister(cdev); | |
1da177e4 | 176 | |
d550d98d | 177 | return 0; |
1da177e4 LT |
178 | } |
179 | ||
90692404 | 180 | #ifdef CONFIG_PM_SLEEP |
62fcbdd9 | 181 | static int acpi_fan_suspend(struct device *dev) |
ec68373c | 182 | { |
19593a1f | 183 | acpi_device_set_power(ACPI_COMPANION(dev), ACPI_STATE_D0); |
ec68373c LB |
184 | |
185 | return AE_OK; | |
186 | } | |
187 | ||
62fcbdd9 | 188 | static int acpi_fan_resume(struct device *dev) |
ec68373c | 189 | { |
488a76c5 | 190 | int result; |
ec68373c | 191 | |
19593a1f | 192 | result = acpi_device_update_power(ACPI_COMPANION(dev), NULL); |
488a76c5 | 193 | if (result) |
19593a1f | 194 | dev_err(dev, "Error updating fan power state\n"); |
ec68373c LB |
195 | |
196 | return result; | |
197 | } | |
90692404 | 198 | #endif |
ec68373c | 199 | |
19593a1f | 200 | module_platform_driver(acpi_fan_driver); |