blob: 75483c9be0c4da1be5d467c8ebdd7c2601bbd681 [file] [log] [blame]
Thomas Gleixner2874c5f2019-05-27 08:55:01 +02001// SPDX-License-Identifier: GPL-2.0-or-later
Mark Brown1d9f9f02008-09-10 18:58:42 +01002/*
3 * Core driver for WM8400.
4 *
5 * Copyright 2008 Wolfson Microelectronics PLC.
6 *
7 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
Mark Brown1d9f9f02008-09-10 18:58:42 +01008 */
9
Paul Gortmakerb2b65872019-01-13 13:36:49 -050010#include <linux/init.h>
Mark Brown1d9f9f02008-09-10 18:58:42 +010011#include <linux/bug.h>
Mark Brown50eeef52011-08-09 16:34:29 +090012#include <linux/err.h>
Mark Brown1d9f9f02008-09-10 18:58:42 +010013#include <linux/i2c.h>
14#include <linux/kernel.h>
Mark Brownb8380c12008-12-18 10:54:22 +010015#include <linux/mfd/core.h>
Mark Brown1d9f9f02008-09-10 18:58:42 +010016#include <linux/mfd/wm8400-private.h>
17#include <linux/mfd/wm8400-audio.h>
Mark Brown50eeef52011-08-09 16:34:29 +090018#include <linux/regmap.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090019#include <linux/slab.h>
Mark Brown1d9f9f02008-09-10 18:58:42 +010020
Mark Brown879eed62012-05-09 22:53:48 +010021static bool wm8400_volatile(struct device *dev, unsigned int reg)
Mark Brown1d9f9f02008-09-10 18:58:42 +010022{
Mark Brown879eed62012-05-09 22:53:48 +010023 switch (reg) {
24 case WM8400_INTERRUPT_STATUS_1:
25 case WM8400_INTERRUPT_LEVELS:
26 case WM8400_SHUTDOWN_REASON:
27 return true;
28 default:
29 return false;
Mark Brown1d9f9f02008-09-10 18:58:42 +010030 }
Mark Brown1d9f9f02008-09-10 18:58:42 +010031}
32
Mark Brownb8380c12008-12-18 10:54:22 +010033static int wm8400_register_codec(struct wm8400 *wm8400)
34{
Krzysztof Kozlowskid1fb70e2014-05-13 12:58:45 +020035 const struct mfd_cell cell = {
Mark Brownb8380c12008-12-18 10:54:22 +010036 .name = "wm8400-codec",
Samuel Ortize45be4b2011-05-11 10:44:36 +020037 .platform_data = wm8400,
38 .pdata_size = sizeof(*wm8400),
Mark Brownb8380c12008-12-18 10:54:22 +010039 };
40
Laxman Dewangan7825dc02016-04-08 00:13:14 +053041 return devm_mfd_add_devices(wm8400->dev, -1, &cell, 1, NULL, 0, NULL);
Mark Brownb8380c12008-12-18 10:54:22 +010042}
43
Mark Brown1d9f9f02008-09-10 18:58:42 +010044/*
45 * wm8400_init - Generic initialisation
46 *
47 * The WM8400 can be configured as either an I2C or SPI device. Probe
48 * functions for each bus set up the accessors then call into this to
49 * set up the device itself.
50 */
51static int wm8400_init(struct wm8400 *wm8400,
52 struct wm8400_platform_data *pdata)
53{
Mark Brown879eed62012-05-09 22:53:48 +010054 unsigned int reg;
55 int ret;
Mark Brown1d9f9f02008-09-10 18:58:42 +010056
Mark Brown1d9f9f02008-09-10 18:58:42 +010057 /* Check that this is actually a WM8400 */
Mark Brown879eed62012-05-09 22:53:48 +010058 ret = regmap_read(wm8400->regmap, WM8400_RESET_ID, &reg);
Mark Brown1d9f9f02008-09-10 18:58:42 +010059 if (ret != 0) {
60 dev_err(wm8400->dev, "Chip ID register read failed\n");
61 return -EIO;
62 }
Mark Brown879eed62012-05-09 22:53:48 +010063 if (reg != 0x6172) {
64 dev_err(wm8400->dev, "Device is not a WM8400, ID is %x\n",
65 reg);
Mark Brown1d9f9f02008-09-10 18:58:42 +010066 return -ENODEV;
67 }
68
Mark Brown879eed62012-05-09 22:53:48 +010069 ret = regmap_read(wm8400->regmap, WM8400_ID, &reg);
Mark Brown1d9f9f02008-09-10 18:58:42 +010070 if (ret != 0) {
71 dev_err(wm8400->dev, "ID register read failed: %d\n", ret);
72 return ret;
73 }
74 reg = (reg & WM8400_CHIP_REV_MASK) >> WM8400_CHIP_REV_SHIFT;
75 dev_info(wm8400->dev, "WM8400 revision %x\n", reg);
76
Mark Brownb8380c12008-12-18 10:54:22 +010077 ret = wm8400_register_codec(wm8400);
78 if (ret != 0) {
79 dev_err(wm8400->dev, "Failed to register codec\n");
Laxman Dewangan7825dc02016-04-08 00:13:14 +053080 return ret;
Mark Brownb8380c12008-12-18 10:54:22 +010081 }
82
Mark Brown1d9f9f02008-09-10 18:58:42 +010083 if (pdata && pdata->platform_init) {
84 ret = pdata->platform_init(wm8400->dev);
Mark Brownb8380c12008-12-18 10:54:22 +010085 if (ret != 0) {
Mark Brown1d9f9f02008-09-10 18:58:42 +010086 dev_err(wm8400->dev, "Platform init failed: %d\n",
87 ret);
Laxman Dewangan7825dc02016-04-08 00:13:14 +053088 return ret;
Mark Brownb8380c12008-12-18 10:54:22 +010089 }
Mark Brown1d9f9f02008-09-10 18:58:42 +010090 } else
91 dev_warn(wm8400->dev, "No platform initialisation supplied\n");
92
Mark Brownb8380c12008-12-18 10:54:22 +010093 return 0;
Mark Brown1d9f9f02008-09-10 18:58:42 +010094}
95
Mark Brown50eeef52011-08-09 16:34:29 +090096static const struct regmap_config wm8400_regmap_config = {
97 .reg_bits = 8,
98 .val_bits = 16,
99 .max_register = WM8400_REGISTER_COUNT - 1,
Mark Brown879eed62012-05-09 22:53:48 +0100100
101 .volatile_reg = wm8400_volatile,
102
103 .cache_type = REGCACHE_RBTREE,
Mark Brown50eeef52011-08-09 16:34:29 +0900104};
105
Mark Brown879eed62012-05-09 22:53:48 +0100106/**
107 * wm8400_reset_codec_reg_cache - Reset cached codec registers to
108 * their default values.
Lee Jonesf139ef72020-06-23 14:06:40 +0100109 *
110 * @wm8400: pointer to local driver data structure
Mark Brown879eed62012-05-09 22:53:48 +0100111 */
112void wm8400_reset_codec_reg_cache(struct wm8400 *wm8400)
113{
114 regmap_reinit_cache(wm8400->regmap, &wm8400_regmap_config);
115}
116EXPORT_SYMBOL_GPL(wm8400_reset_codec_reg_cache);
117
Javier Martinez Canillas5eb519f2016-04-20 13:45:46 -0400118#if IS_ENABLED(CONFIG_I2C)
Uwe Kleine-König521fcf42022-11-18 23:43:34 +0100119static int wm8400_i2c_probe(struct i2c_client *i2c)
Mark Brown1d9f9f02008-09-10 18:58:42 +0100120{
121 struct wm8400 *wm8400;
Mark Brown1d9f9f02008-09-10 18:58:42 +0100122
Mark Brownf5772342011-12-03 21:43:04 +0000123 wm8400 = devm_kzalloc(&i2c->dev, sizeof(struct wm8400), GFP_KERNEL);
Sachin Kamat82ae61c2014-02-14 15:21:05 +0530124 if (!wm8400)
125 return -ENOMEM;
Mark Brown1d9f9f02008-09-10 18:58:42 +0100126
Mark Brown2b40e9d2012-01-30 21:18:01 +0000127 wm8400->regmap = devm_regmap_init_i2c(i2c, &wm8400_regmap_config);
Sachin Kamat82ae61c2014-02-14 15:21:05 +0530128 if (IS_ERR(wm8400->regmap))
129 return PTR_ERR(wm8400->regmap);
Mark Brown50eeef52011-08-09 16:34:29 +0900130
Mark Brown1d9f9f02008-09-10 18:58:42 +0100131 wm8400->dev = &i2c->dev;
132 i2c_set_clientdata(i2c, wm8400);
133
Sachin Kamat82ae61c2014-02-14 15:21:05 +0530134 return wm8400_init(wm8400, dev_get_platdata(&i2c->dev));
Mark Brown1d9f9f02008-09-10 18:58:42 +0100135}
136
Mark Brown1d9f9f02008-09-10 18:58:42 +0100137static const struct i2c_device_id wm8400_i2c_id[] = {
138 { "wm8400", 0 },
139 { }
140};
Mark Brown1d9f9f02008-09-10 18:58:42 +0100141
142static struct i2c_driver wm8400_i2c_driver = {
143 .driver = {
144 .name = "WM8400",
Mark Brown1d9f9f02008-09-10 18:58:42 +0100145 },
Uwe Kleine-König9816d852023-05-15 20:27:52 +0200146 .probe = wm8400_i2c_probe,
Mark Brown1d9f9f02008-09-10 18:58:42 +0100147 .id_table = wm8400_i2c_id,
148};
149#endif
150
Paul Gortmakerb2b65872019-01-13 13:36:49 -0500151static int __init wm8400_driver_init(void)
Mark Brown1d9f9f02008-09-10 18:58:42 +0100152{
153 int ret = -ENODEV;
154
Javier Martinez Canillas5eb519f2016-04-20 13:45:46 -0400155#if IS_ENABLED(CONFIG_I2C)
Mark Brown1d9f9f02008-09-10 18:58:42 +0100156 ret = i2c_add_driver(&wm8400_i2c_driver);
157 if (ret != 0)
158 pr_err("Failed to register I2C driver: %d\n", ret);
159#endif
160
161 return ret;
162}
Paul Gortmakerb2b65872019-01-13 13:36:49 -0500163subsys_initcall(wm8400_driver_init);