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1 | /* |
2 | * wm831x-spi.c -- SPI access for Wolfson WM831x PMICs |
3 | * |
4 | * Copyright 2009,2010 Wolfson Microelectronics PLC. |
5 | * |
6 | * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> |
7 | * |
8 | * This program is free software; you can redistribute it and/or modify it |
9 | * under the terms of the GNU General Public License as published by the |
10 | * Free Software Foundation; either version 2 of the License, or (at your |
11 | * option) any later version. |
12 | * |
13 | */ |
14 | |
15 | #include <linux/kernel.h> |
16 | #include <linux/module.h> |
17 | #include <linux/pm.h> |
18 | #include <linux/spi/spi.h> |
19 | #include <linux/regmap.h> |
20 | #include <linux/err.h> |
21 | |
22 | #include <linux/mfd/wm831x/core.h> |
23 | |
24 | static int wm831x_spi_probe(struct spi_device *spi) |
25 | { |
26 | const struct spi_device_id *id = spi_get_device_id(spi); |
27 | struct wm831x *wm831x; |
28 | enum wm831x_parent type; |
29 | int ret; |
30 | |
31 | type = (enum wm831x_parent)id->driver_data; |
32 | |
33 | wm831x = devm_kzalloc(&spi->dev, sizeof(struct wm831x), GFP_KERNEL); |
34 | if (wm831x == NULL) |
35 | return -ENOMEM; |
36 | |
37 | spi->bits_per_word = 16; |
38 | spi->mode = SPI_MODE_0; |
39 | |
40 | dev_set_drvdata(&spi->dev, wm831x); |
41 | wm831x->dev = &spi->dev; |
42 | |
43 | wm831x->regmap = devm_regmap_init_spi(spi, &wm831x_regmap_config); |
44 | if (IS_ERR(wm831x->regmap)) { |
45 | ret = PTR_ERR(wm831x->regmap); |
46 | dev_err(wm831x->dev, "Failed to allocate register map: %d\n", |
47 | ret); |
48 | return ret; |
49 | } |
50 | |
51 | return wm831x_device_init(wm831x, type, spi->irq); |
52 | } |
53 | |
54 | static int wm831x_spi_remove(struct spi_device *spi) |
55 | { |
56 | struct wm831x *wm831x = dev_get_drvdata(&spi->dev); |
57 | |
58 | wm831x_device_exit(wm831x); |
59 | |
60 | return 0; |
61 | } |
62 | |
63 | static int wm831x_spi_suspend(struct device *dev) |
64 | { |
65 | struct wm831x *wm831x = dev_get_drvdata(dev); |
66 | |
67 | return wm831x_device_suspend(wm831x); |
68 | } |
69 | |
70 | static void wm831x_spi_shutdown(struct spi_device *spi) |
71 | { |
72 | struct wm831x *wm831x = dev_get_drvdata(&spi->dev); |
73 | |
74 | wm831x_device_shutdown(wm831x); |
75 | } |
76 | |
77 | static const struct dev_pm_ops wm831x_spi_pm = { |
78 | .freeze = wm831x_spi_suspend, |
79 | .suspend = wm831x_spi_suspend, |
80 | }; |
81 | |
82 | static const struct spi_device_id wm831x_spi_ids[] = { |
83 | { "wm8310", WM8310 }, |
84 | { "wm8311", WM8311 }, |
85 | { "wm8312", WM8312 }, |
86 | { "wm8320", WM8320 }, |
87 | { "wm8321", WM8321 }, |
88 | { "wm8325", WM8325 }, |
89 | { "wm8326", WM8326 }, |
90 | { }, |
91 | }; |
92 | MODULE_DEVICE_TABLE(spi, wm831x_spi_ids); |
93 | |
94 | static struct spi_driver wm831x_spi_driver = { |
95 | .driver = { |
96 | .name = "wm831x", |
97 | .owner = THIS_MODULE, |
98 | .pm = &wm831x_spi_pm, |
99 | }, |
100 | .id_table = wm831x_spi_ids, |
101 | .probe = wm831x_spi_probe, |
102 | .remove = wm831x_spi_remove, |
103 | .shutdown = wm831x_spi_shutdown, |
104 | }; |
105 | |
106 | static int __init wm831x_spi_init(void) |
107 | { |
108 | int ret; |
109 | |
110 | ret = spi_register_driver(&wm831x_spi_driver); |
111 | if (ret != 0) |
112 | pr_err("Failed to register WM831x SPI driver: %d\n", ret); |
113 | |
114 | return 0; |
115 | } |
116 | subsys_initcall(wm831x_spi_init); |
117 | |
118 | static void __exit wm831x_spi_exit(void) |
119 | { |
120 | spi_unregister_driver(&wm831x_spi_driver); |
121 | } |
122 | module_exit(wm831x_spi_exit); |
123 | |
124 | MODULE_DESCRIPTION("SPI support for WM831x/2x AudioPlus PMICs"); |
125 | MODULE_LICENSE("GPL"); |
126 | MODULE_AUTHOR("Mark Brown"); |
127 |
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