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1 | /* |
2 | * Simple Power-Managed Bus Driver | |
3 | * | |
4 | * Copyright (C) 2014-2015 Glider bvba | |
5 | * | |
6 | * This file is subject to the terms and conditions of the GNU General Public | |
7 | * License. See the file "COPYING" in the main directory of this archive | |
8 | * for more details. | |
9 | */ | |
10 | ||
11 | #include <linux/module.h> | |
12 | #include <linux/of_platform.h> | |
13 | #include <linux/platform_device.h> | |
14 | #include <linux/pm_runtime.h> | |
15 | ||
89d463ea GU |
16 | static int simple_pm_bus_probe(struct platform_device *pdev) |
17 | { | |
98e96cf8 SK |
18 | const struct device *dev = &pdev->dev; |
19 | const struct of_dev_auxdata *lookup = dev_get_platdata(dev); | |
20 | struct device_node *np = dev->of_node; | |
21 | const struct of_device_id *match; | |
22 | ||
23 | /* | |
24 | * Allow user to use driver_override to bind this driver to a | |
25 | * transparent bus device which has a different compatible string | |
26 | * that's not listed in simple_pm_bus_of_match. We don't want to do any | |
27 | * of the simple-pm-bus tasks for these devices, so return early. | |
28 | */ | |
29 | if (pdev->driver_override) | |
30 | return 0; | |
31 | ||
32 | match = of_match_device(dev->driver->of_match_table, dev); | |
33 | /* | |
34 | * These are transparent bus devices (not simple-pm-bus matches) that | |
35 | * have their child nodes populated automatically. So, don't need to | |
36 | * do anything more. We only match with the device if this driver is | |
37 | * the most specific match because we don't want to incorrectly bind to | |
38 | * a device that has a more specific driver. | |
39 | */ | |
40 | if (match && match->data) { | |
41 | if (of_property_match_string(np, "compatible", match->compatible) == 0) | |
42 | return 0; | |
43 | else | |
44 | return -ENODEV; | |
45 | } | |
89d463ea GU |
46 | |
47 | dev_dbg(&pdev->dev, "%s\n", __func__); | |
48 | ||
49 | pm_runtime_enable(&pdev->dev); | |
50 | ||
51 | if (np) | |
eda080ea | 52 | of_platform_populate(np, NULL, lookup, &pdev->dev); |
89d463ea GU |
53 | |
54 | return 0; | |
55 | } | |
56 | ||
57 | static int simple_pm_bus_remove(struct platform_device *pdev) | |
58 | { | |
98e96cf8 SK |
59 | const void *data = of_device_get_match_data(&pdev->dev); |
60 | ||
61 | if (pdev->driver_override || data) | |
62 | return 0; | |
63 | ||
89d463ea GU |
64 | dev_dbg(&pdev->dev, "%s\n", __func__); |
65 | ||
66 | pm_runtime_disable(&pdev->dev); | |
67 | return 0; | |
68 | } | |
69 | ||
98e96cf8 SK |
70 | #define ONLY_BUS ((void *) 1) /* Match if the device is only a bus. */ |
71 | ||
89d463ea GU |
72 | static const struct of_device_id simple_pm_bus_of_match[] = { |
73 | { .compatible = "simple-pm-bus", }, | |
98e96cf8 SK |
74 | { .compatible = "simple-bus", .data = ONLY_BUS }, |
75 | { .compatible = "simple-mfd", .data = ONLY_BUS }, | |
76 | { .compatible = "isa", .data = ONLY_BUS }, | |
77 | { .compatible = "arm,amba-bus", .data = ONLY_BUS }, | |
89d463ea GU |
78 | { /* sentinel */ } |
79 | }; | |
80 | MODULE_DEVICE_TABLE(of, simple_pm_bus_of_match); | |
81 | ||
82 | static struct platform_driver simple_pm_bus_driver = { | |
83 | .probe = simple_pm_bus_probe, | |
84 | .remove = simple_pm_bus_remove, | |
85 | .driver = { | |
86 | .name = "simple-pm-bus", | |
87 | .of_match_table = simple_pm_bus_of_match, | |
88 | }, | |
89 | }; | |
90 | ||
91 | module_platform_driver(simple_pm_bus_driver); | |
92 | ||
93 | MODULE_DESCRIPTION("Simple Power-Managed Bus Driver"); | |
94 | MODULE_AUTHOR("Geert Uytterhoeven <geert+renesas@glider.be>"); | |
95 | MODULE_LICENSE("GPL v2"); |