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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/of.h> | |
18 | #include <linux/of_device.h> | |
19 | #include <linux/pm.h> | |
20 | #include <linux/spi/spi.h> | |
21 | #include <linux/regmap.h> | |
22 | #include <linux/err.h> | |
23 | ||
24 | #include <linux/mfd/wm831x/core.h> | |
25 | ||
26 | static int wm831x_spi_probe(struct spi_device *spi) | |
27 | { | |
28 | struct wm831x_pdata *pdata = dev_get_platdata(&spi->dev); | |
29 | const struct spi_device_id *id = spi_get_device_id(spi); | |
30 | const struct of_device_id *of_id; | |
31 | struct wm831x *wm831x; | |
32 | enum wm831x_parent type; | |
33 | int ret; | |
34 | ||
35 | if (spi->dev.of_node) { | |
36 | of_id = of_match_device(wm831x_of_match, &spi->dev); | |
37 | if (!of_id) { | |
38 | dev_err(&spi->dev, "Failed to match device\n"); | |
39 | return -ENODEV; | |
40 | } | |
41 | type = (enum wm831x_parent)of_id->data; | |
42 | } else { | |
43 | type = (enum wm831x_parent)id->driver_data; | |
44 | } | |
45 | ||
46 | wm831x = devm_kzalloc(&spi->dev, sizeof(struct wm831x), GFP_KERNEL); | |
47 | if (wm831x == NULL) | |
48 | return -ENOMEM; | |
49 | ||
50 | spi->mode = SPI_MODE_0; | |
51 | ||
52 | spi_set_drvdata(spi, wm831x); | |
53 | wm831x->dev = &spi->dev; | |
54 | wm831x->type = type; | |
55 | ||
56 | wm831x->regmap = devm_regmap_init_spi(spi, &wm831x_regmap_config); | |
57 | if (IS_ERR(wm831x->regmap)) { | |
58 | ret = PTR_ERR(wm831x->regmap); | |
59 | dev_err(wm831x->dev, "Failed to allocate register map: %d\n", | |
60 | ret); | |
61 | return ret; | |
62 | } | |
63 | ||
64 | if (pdata) | |
65 | memcpy(&wm831x->pdata, pdata, sizeof(*pdata)); | |
66 | ||
67 | return wm831x_device_init(wm831x, spi->irq); | |
68 | } | |
69 | ||
70 | static int wm831x_spi_remove(struct spi_device *spi) | |
71 | { | |
72 | struct wm831x *wm831x = spi_get_drvdata(spi); | |
73 | ||
74 | wm831x_device_exit(wm831x); | |
75 | ||
76 | return 0; | |
77 | } | |
78 | ||
79 | static int wm831x_spi_suspend(struct device *dev) | |
80 | { | |
81 | struct wm831x *wm831x = dev_get_drvdata(dev); | |
82 | ||
83 | return wm831x_device_suspend(wm831x); | |
84 | } | |
85 | ||
86 | static int wm831x_spi_poweroff(struct device *dev) | |
87 | { | |
88 | struct wm831x *wm831x = dev_get_drvdata(dev); | |
89 | ||
90 | wm831x_device_shutdown(wm831x); | |
91 | ||
92 | return 0; | |
93 | } | |
94 | ||
95 | static const struct dev_pm_ops wm831x_spi_pm = { | |
96 | .freeze = wm831x_spi_suspend, | |
97 | .suspend = wm831x_spi_suspend, | |
98 | .poweroff = wm831x_spi_poweroff, | |
99 | }; | |
100 | ||
101 | static const struct spi_device_id wm831x_spi_ids[] = { | |
102 | { "wm8310", WM8310 }, | |
103 | { "wm8311", WM8311 }, | |
104 | { "wm8312", WM8312 }, | |
105 | { "wm8320", WM8320 }, | |
106 | { "wm8321", WM8321 }, | |
107 | { "wm8325", WM8325 }, | |
108 | { "wm8326", WM8326 }, | |
109 | { }, | |
110 | }; | |
111 | MODULE_DEVICE_TABLE(spi, wm831x_spi_ids); | |
112 | ||
113 | static struct spi_driver wm831x_spi_driver = { | |
114 | .driver = { | |
115 | .name = "wm831x", | |
116 | .pm = &wm831x_spi_pm, | |
117 | .of_match_table = of_match_ptr(wm831x_of_match), | |
118 | }, | |
119 | .id_table = wm831x_spi_ids, | |
120 | .probe = wm831x_spi_probe, | |
121 | .remove = wm831x_spi_remove, | |
122 | }; | |
123 | ||
124 | static int __init wm831x_spi_init(void) | |
125 | { | |
126 | int ret; | |
127 | ||
128 | ret = spi_register_driver(&wm831x_spi_driver); | |
129 | if (ret != 0) | |
130 | pr_err("Failed to register WM831x SPI driver: %d\n", ret); | |
131 | ||
132 | return 0; | |
133 | } | |
134 | subsys_initcall(wm831x_spi_init); | |
135 | ||
136 | static void __exit wm831x_spi_exit(void) | |
137 | { | |
138 | spi_unregister_driver(&wm831x_spi_driver); | |
139 | } | |
140 | module_exit(wm831x_spi_exit); | |
141 | ||
142 | MODULE_DESCRIPTION("SPI support for WM831x/2x AudioPlus PMICs"); | |
143 | MODULE_LICENSE("GPL"); | |
144 | MODULE_AUTHOR("Mark Brown"); |