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/init.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
26static 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
70static int wm831x_spi_suspend(struct device *dev)
71{
72 struct wm831x *wm831x = dev_get_drvdata(dev);
73
74 return wm831x_device_suspend(wm831x);
75}
76
77static int wm831x_spi_poweroff(struct device *dev)
78{
79 struct wm831x *wm831x = dev_get_drvdata(dev);
80
81 wm831x_device_shutdown(wm831x);
82
83 return 0;
84}
85
86static const struct dev_pm_ops wm831x_spi_pm = {
87 .freeze = wm831x_spi_suspend,
88 .suspend = wm831x_spi_suspend,
89 .poweroff = wm831x_spi_poweroff,
90};
91
92static const struct spi_device_id wm831x_spi_ids[] = {
93 { "wm8310", WM8310 },
94 { "wm8311", WM8311 },
95 { "wm8312", WM8312 },
96 { "wm8320", WM8320 },
97 { "wm8321", WM8321 },
98 { "wm8325", WM8325 },
99 { "wm8326", WM8326 },
100 { },
101};
102
103static struct spi_driver wm831x_spi_driver = {
104 .driver = {
105 .name = "wm831x",
106 .pm = &wm831x_spi_pm,
107 .of_match_table = of_match_ptr(wm831x_of_match),
108 .suppress_bind_attrs = true,
109 },
110 .id_table = wm831x_spi_ids,
111 .probe = wm831x_spi_probe,
112};
113
114static int __init wm831x_spi_init(void)
115{
116 int ret;
117
118 ret = spi_register_driver(&wm831x_spi_driver);
119 if (ret != 0)
120 pr_err("Failed to register WM831x SPI driver: %d\n", ret);
121
122 return 0;
123}
124subsys_initcall(wm831x_spi_init);
125