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Mark Brown1d9f9f02008-09-10 18:58:42 +01001/*
2 * Core driver for WM8400.
3 *
4 * Copyright 2008 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
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of the
11 * License, or (at your option) any later version.
12 *
13 */
14
Paul Gortmaker4e36dd32011-07-03 15:13:27 -040015#include <linux/module.h>
Mark Brown1d9f9f02008-09-10 18:58:42 +010016#include <linux/bug.h>
Mark Brown50eeef52011-08-09 16:34:29 +090017#include <linux/err.h>
Mark Brown1d9f9f02008-09-10 18:58:42 +010018#include <linux/i2c.h>
19#include <linux/kernel.h>
Mark Brownb8380c12008-12-18 10:54:22 +010020#include <linux/mfd/core.h>
Mark Brown1d9f9f02008-09-10 18:58:42 +010021#include <linux/mfd/wm8400-private.h>
22#include <linux/mfd/wm8400-audio.h>
Mark Brown50eeef52011-08-09 16:34:29 +090023#include <linux/regmap.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090024#include <linux/slab.h>
Mark Brown1d9f9f02008-09-10 18:58:42 +010025
Mark Brown879eed62012-05-09 22:53:48 +010026static bool wm8400_volatile(struct device *dev, unsigned int reg)
Mark Brown1d9f9f02008-09-10 18:58:42 +010027{
Mark Brown879eed62012-05-09 22:53:48 +010028 switch (reg) {
29 case WM8400_INTERRUPT_STATUS_1:
30 case WM8400_INTERRUPT_LEVELS:
31 case WM8400_SHUTDOWN_REASON:
32 return true;
33 default:
34 return false;
Mark Brown1d9f9f02008-09-10 18:58:42 +010035 }
Mark Brown1d9f9f02008-09-10 18:58:42 +010036}
37
38/**
39 * wm8400_reg_read - Single register read
40 *
41 * @wm8400: Pointer to wm8400 control structure
42 * @reg: Register to read
43 *
44 * @return Read value
45 */
46u16 wm8400_reg_read(struct wm8400 *wm8400, u8 reg)
47{
Mark Brown879eed62012-05-09 22:53:48 +010048 unsigned int val;
49 int ret;
Mark Brown1d9f9f02008-09-10 18:58:42 +010050
Mark Brown879eed62012-05-09 22:53:48 +010051 ret = regmap_read(wm8400->regmap, reg, &val);
52 if (ret < 0)
53 return ret;
Mark Brown1d9f9f02008-09-10 18:58:42 +010054
55 return val;
56}
57EXPORT_SYMBOL_GPL(wm8400_reg_read);
58
59int wm8400_block_read(struct wm8400 *wm8400, u8 reg, int count, u16 *data)
60{
Mark Brown879eed62012-05-09 22:53:48 +010061 return regmap_bulk_read(wm8400->regmap, reg, data, count);
Mark Brown1d9f9f02008-09-10 18:58:42 +010062}
Mark Brownebd29c62012-05-14 10:13:16 +010063EXPORT_SYMBOL_GPL(wm8400_block_read);
Mark Brown1d9f9f02008-09-10 18:58:42 +010064
Mark Brownb8380c12008-12-18 10:54:22 +010065static int wm8400_register_codec(struct wm8400 *wm8400)
66{
Krzysztof Kozlowskid1fb70e2014-05-13 12:58:45 +020067 const struct mfd_cell cell = {
Mark Brownb8380c12008-12-18 10:54:22 +010068 .name = "wm8400-codec",
Samuel Ortize45be4b2011-05-11 10:44:36 +020069 .platform_data = wm8400,
70 .pdata_size = sizeof(*wm8400),
Mark Brownb8380c12008-12-18 10:54:22 +010071 };
72
Mark Brown0848c942012-09-11 15:16:36 +080073 return mfd_add_devices(wm8400->dev, -1, &cell, 1, NULL, 0, NULL);
Mark Brownb8380c12008-12-18 10:54:22 +010074}
75
Mark Brown1d9f9f02008-09-10 18:58:42 +010076/*
77 * wm8400_init - Generic initialisation
78 *
79 * The WM8400 can be configured as either an I2C or SPI device. Probe
80 * functions for each bus set up the accessors then call into this to
81 * set up the device itself.
82 */
83static int wm8400_init(struct wm8400 *wm8400,
84 struct wm8400_platform_data *pdata)
85{
Mark Brown879eed62012-05-09 22:53:48 +010086 unsigned int reg;
87 int ret;
Mark Brown1d9f9f02008-09-10 18:58:42 +010088
Greg Kroah-Hartman1902a9e2009-04-30 14:43:31 -070089 dev_set_drvdata(wm8400->dev, wm8400);
Mark Brown1d9f9f02008-09-10 18:58:42 +010090
91 /* Check that this is actually a WM8400 */
Mark Brown879eed62012-05-09 22:53:48 +010092 ret = regmap_read(wm8400->regmap, WM8400_RESET_ID, &reg);
Mark Brown1d9f9f02008-09-10 18:58:42 +010093 if (ret != 0) {
94 dev_err(wm8400->dev, "Chip ID register read failed\n");
95 return -EIO;
96 }
Mark Brown879eed62012-05-09 22:53:48 +010097 if (reg != 0x6172) {
98 dev_err(wm8400->dev, "Device is not a WM8400, ID is %x\n",
99 reg);
Mark Brown1d9f9f02008-09-10 18:58:42 +0100100 return -ENODEV;
101 }
102
Mark Brown879eed62012-05-09 22:53:48 +0100103 ret = regmap_read(wm8400->regmap, WM8400_ID, &reg);
Mark Brown1d9f9f02008-09-10 18:58:42 +0100104 if (ret != 0) {
105 dev_err(wm8400->dev, "ID register read failed: %d\n", ret);
106 return ret;
107 }
108 reg = (reg & WM8400_CHIP_REV_MASK) >> WM8400_CHIP_REV_SHIFT;
109 dev_info(wm8400->dev, "WM8400 revision %x\n", reg);
110
Mark Brownb8380c12008-12-18 10:54:22 +0100111 ret = wm8400_register_codec(wm8400);
112 if (ret != 0) {
113 dev_err(wm8400->dev, "Failed to register codec\n");
114 goto err_children;
115 }
116
Mark Brown1d9f9f02008-09-10 18:58:42 +0100117 if (pdata && pdata->platform_init) {
118 ret = pdata->platform_init(wm8400->dev);
Mark Brownb8380c12008-12-18 10:54:22 +0100119 if (ret != 0) {
Mark Brown1d9f9f02008-09-10 18:58:42 +0100120 dev_err(wm8400->dev, "Platform init failed: %d\n",
121 ret);
Mark Brownb8380c12008-12-18 10:54:22 +0100122 goto err_children;
123 }
Mark Brown1d9f9f02008-09-10 18:58:42 +0100124 } else
125 dev_warn(wm8400->dev, "No platform initialisation supplied\n");
126
Mark Brownb8380c12008-12-18 10:54:22 +0100127 return 0;
128
129err_children:
130 mfd_remove_devices(wm8400->dev);
Mark Brown1d9f9f02008-09-10 18:58:42 +0100131 return ret;
132}
133
134static void wm8400_release(struct wm8400 *wm8400)
135{
Mark Brownb8380c12008-12-18 10:54:22 +0100136 mfd_remove_devices(wm8400->dev);
Mark Brown1d9f9f02008-09-10 18:58:42 +0100137}
138
Mark Brown50eeef52011-08-09 16:34:29 +0900139static const struct regmap_config wm8400_regmap_config = {
140 .reg_bits = 8,
141 .val_bits = 16,
142 .max_register = WM8400_REGISTER_COUNT - 1,
Mark Brown879eed62012-05-09 22:53:48 +0100143
144 .volatile_reg = wm8400_volatile,
145
146 .cache_type = REGCACHE_RBTREE,
Mark Brown50eeef52011-08-09 16:34:29 +0900147};
148
Mark Brown879eed62012-05-09 22:53:48 +0100149/**
150 * wm8400_reset_codec_reg_cache - Reset cached codec registers to
151 * their default values.
152 */
153void wm8400_reset_codec_reg_cache(struct wm8400 *wm8400)
154{
155 regmap_reinit_cache(wm8400->regmap, &wm8400_regmap_config);
156}
157EXPORT_SYMBOL_GPL(wm8400_reset_codec_reg_cache);
158
Mark Brown1d9f9f02008-09-10 18:58:42 +0100159#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
Mark Brown1d9f9f02008-09-10 18:58:42 +0100160static int wm8400_i2c_probe(struct i2c_client *i2c,
161 const struct i2c_device_id *id)
162{
163 struct wm8400 *wm8400;
Mark Brown1d9f9f02008-09-10 18:58:42 +0100164
Mark Brownf5772342011-12-03 21:43:04 +0000165 wm8400 = devm_kzalloc(&i2c->dev, sizeof(struct wm8400), GFP_KERNEL);
Sachin Kamat82ae61c2014-02-14 15:21:05 +0530166 if (!wm8400)
167 return -ENOMEM;
Mark Brown1d9f9f02008-09-10 18:58:42 +0100168
Mark Brown2b40e9d2012-01-30 21:18:01 +0000169 wm8400->regmap = devm_regmap_init_i2c(i2c, &wm8400_regmap_config);
Sachin Kamat82ae61c2014-02-14 15:21:05 +0530170 if (IS_ERR(wm8400->regmap))
171 return PTR_ERR(wm8400->regmap);
Mark Brown50eeef52011-08-09 16:34:29 +0900172
Mark Brown1d9f9f02008-09-10 18:58:42 +0100173 wm8400->dev = &i2c->dev;
174 i2c_set_clientdata(i2c, wm8400);
175
Sachin Kamat82ae61c2014-02-14 15:21:05 +0530176 return wm8400_init(wm8400, dev_get_platdata(&i2c->dev));
Mark Brown1d9f9f02008-09-10 18:58:42 +0100177}
178
179static int wm8400_i2c_remove(struct i2c_client *i2c)
180{
181 struct wm8400 *wm8400 = i2c_get_clientdata(i2c);
182
183 wm8400_release(wm8400);
Mark Brown1d9f9f02008-09-10 18:58:42 +0100184
185 return 0;
186}
187
188static const struct i2c_device_id wm8400_i2c_id[] = {
189 { "wm8400", 0 },
190 { }
191};
192MODULE_DEVICE_TABLE(i2c, wm8400_i2c_id);
193
194static struct i2c_driver wm8400_i2c_driver = {
195 .driver = {
196 .name = "WM8400",
Mark Brown1d9f9f02008-09-10 18:58:42 +0100197 },
198 .probe = wm8400_i2c_probe,
199 .remove = wm8400_i2c_remove,
200 .id_table = wm8400_i2c_id,
201};
202#endif
203
204static int __init wm8400_module_init(void)
205{
206 int ret = -ENODEV;
207
208#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
209 ret = i2c_add_driver(&wm8400_i2c_driver);
210 if (ret != 0)
211 pr_err("Failed to register I2C driver: %d\n", ret);
212#endif
213
214 return ret;
215}
Samuel Ortiz2021de82009-06-15 18:04:54 +0200216subsys_initcall(wm8400_module_init);
Mark Brown1d9f9f02008-09-10 18:58:42 +0100217
218static void __exit wm8400_module_exit(void)
219{
220#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
221 i2c_del_driver(&wm8400_i2c_driver);
222#endif
223}
224module_exit(wm8400_module_exit);
225
226MODULE_LICENSE("GPL");
227MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");