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56fb8de5 LD |
1 | /* |
2 | * Power off driver for ams AS3722 device. | |
3 | * | |
4 | * Copyright (c) 2013, NVIDIA CORPORATION. All rights reserved. | |
5 | * | |
6 | * Author: Laxman Dewangan <ldewangan@nvidia.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms and conditions of the GNU General Public License, | |
10 | * version 2, as published by the Free Software Foundation. | |
11 | * | |
12 | * This program is distributed in the hope it will be useful, but WITHOUT | |
13 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
15 | * more details. | |
16 | */ | |
17 | ||
18 | #include <linux/mfd/as3722.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/of.h> | |
21 | #include <linux/of_device.h> | |
22 | #include <linux/platform_device.h> | |
23 | #include <linux/slab.h> | |
24 | ||
25 | struct as3722_poweroff { | |
26 | struct device *dev; | |
27 | struct as3722 *as3722; | |
28 | }; | |
29 | ||
30 | static struct as3722_poweroff *as3722_pm_poweroff; | |
31 | ||
32 | static void as3722_pm_power_off(void) | |
33 | { | |
34 | int ret; | |
35 | ||
36 | if (!as3722_pm_poweroff) { | |
37 | pr_err("AS3722 poweroff is not initialised\n"); | |
38 | return; | |
39 | } | |
40 | ||
41 | ret = as3722_update_bits(as3722_pm_poweroff->as3722, | |
42 | AS3722_RESET_CONTROL_REG, AS3722_POWER_OFF, AS3722_POWER_OFF); | |
43 | if (ret < 0) | |
44 | dev_err(as3722_pm_poweroff->dev, | |
45 | "RESET_CONTROL_REG update failed, %d\n", ret); | |
46 | } | |
47 | ||
48 | static int as3722_poweroff_probe(struct platform_device *pdev) | |
49 | { | |
50 | struct as3722_poweroff *as3722_poweroff; | |
51 | struct device_node *np = pdev->dev.parent->of_node; | |
52 | ||
53 | if (!np) | |
54 | return -EINVAL; | |
55 | ||
56 | if (!of_property_read_bool(np, "ams,system-power-controller")) | |
57 | return 0; | |
58 | ||
59 | as3722_poweroff = devm_kzalloc(&pdev->dev, sizeof(*as3722_poweroff), | |
60 | GFP_KERNEL); | |
61 | if (!as3722_poweroff) | |
62 | return -ENOMEM; | |
63 | ||
64 | as3722_poweroff->as3722 = dev_get_drvdata(pdev->dev.parent); | |
65 | as3722_poweroff->dev = &pdev->dev; | |
66 | as3722_pm_poweroff = as3722_poweroff; | |
67 | if (!pm_power_off) | |
68 | pm_power_off = as3722_pm_power_off; | |
69 | ||
70 | return 0; | |
71 | } | |
72 | ||
73 | static int as3722_poweroff_remove(struct platform_device *pdev) | |
74 | { | |
75 | if (pm_power_off == as3722_pm_power_off) | |
76 | pm_power_off = NULL; | |
77 | as3722_pm_poweroff = NULL; | |
78 | ||
79 | return 0; | |
80 | } | |
81 | ||
82 | static struct platform_driver as3722_poweroff_driver = { | |
83 | .driver = { | |
84 | .name = "as3722-power-off", | |
56fb8de5 LD |
85 | }, |
86 | .probe = as3722_poweroff_probe, | |
87 | .remove = as3722_poweroff_remove, | |
88 | }; | |
89 | ||
90 | module_platform_driver(as3722_poweroff_driver); | |
91 | ||
92 | MODULE_DESCRIPTION("Power off driver for ams AS3722 PMIC Device"); | |
93 | MODULE_ALIAS("platform:as3722-power-off"); | |
94 | MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>"); | |
95 | MODULE_LICENSE("GPL v2"); |