1/*
  2 * wm8350-i2c.c  --  Generic I2C driver for Wolfson WM8350 PMIC
  3 *
  4 * Copyright 2007, 2008 Wolfson Microelectronics PLC.
  5 *
  6 * Author: Liam Girdwood
  7 *         linux@wolfsonmicro.com
  8 *
  9 *  This program is free software; you can redistribute  it and/or modify it
 10 *  under  the terms of  the GNU General  Public License as published by the
 11 *  Free Software Foundation;  either version 2 of the  License, or (at your
 12 *  option) any later version.
 13 *
 14 */
 15
 16#include <linux/module.h>
 17#include <linux/moduleparam.h>
 18#include <linux/init.h>
 19#include <linux/i2c.h>
 20#include <linux/platform_device.h>
 21#include <linux/mfd/wm8350/core.h>
 
 22#include <linux/slab.h>
 23
 24static int wm8350_i2c_read_device(struct wm8350 *wm8350, char reg,
 25				  int bytes, void *dest)
 26{
 27	int ret;
 28
 29	ret = i2c_master_send(wm8350->i2c_client, &reg, 1);
 30	if (ret < 0)
 31		return ret;
 32	ret = i2c_master_recv(wm8350->i2c_client, dest, bytes);
 33	if (ret < 0)
 34		return ret;
 35	if (ret != bytes)
 36		return -EIO;
 37	return 0;
 38}
 39
 40static int wm8350_i2c_write_device(struct wm8350 *wm8350, char reg,
 41				   int bytes, void *src)
 42{
 43	/* we add 1 byte for device register */
 44	u8 msg[(WM8350_MAX_REGISTER << 1) + 1];
 45	int ret;
 46
 47	if (bytes > ((WM8350_MAX_REGISTER << 1) + 1))
 48		return -EINVAL;
 49
 50	msg[0] = reg;
 51	memcpy(&msg[1], src, bytes);
 52	ret = i2c_master_send(wm8350->i2c_client, msg, bytes + 1);
 53	if (ret < 0)
 54		return ret;
 55	if (ret != bytes + 1)
 56		return -EIO;
 57	return 0;
 58}
 59
 60static int wm8350_i2c_probe(struct i2c_client *i2c,
 61			    const struct i2c_device_id *id)
 62{
 63	struct wm8350 *wm8350;
 
 64	int ret = 0;
 65
 66	wm8350 = kzalloc(sizeof(struct wm8350), GFP_KERNEL);
 67	if (wm8350 == NULL)
 68		return -ENOMEM;
 69
 
 
 
 
 
 
 
 
 70	i2c_set_clientdata(i2c, wm8350);
 71	wm8350->dev = &i2c->dev;
 72	wm8350->i2c_client = i2c;
 73	wm8350->read_dev = wm8350_i2c_read_device;
 74	wm8350->write_dev = wm8350_i2c_write_device;
 75
 76	ret = wm8350_device_init(wm8350, i2c->irq, i2c->dev.platform_data);
 77	if (ret < 0)
 78		goto err;
 79
 80	return ret;
 81
 82err:
 83	kfree(wm8350);
 84	return ret;
 85}
 86
 87static int wm8350_i2c_remove(struct i2c_client *i2c)
 88{
 89	struct wm8350 *wm8350 = i2c_get_clientdata(i2c);
 90
 91	wm8350_device_exit(wm8350);
 92	kfree(wm8350);
 93
 94	return 0;
 95}
 96
 97static const struct i2c_device_id wm8350_i2c_id[] = {
 98       { "wm8350", 0 },
 99       { "wm8351", 0 },
100       { "wm8352", 0 },
101       { }
102};
103MODULE_DEVICE_TABLE(i2c, wm8350_i2c_id);
104
105
106static struct i2c_driver wm8350_i2c_driver = {
107	.driver = {
108		   .name = "wm8350",
109		   .owner = THIS_MODULE,
110	},
111	.probe = wm8350_i2c_probe,
112	.remove = wm8350_i2c_remove,
113	.id_table = wm8350_i2c_id,
114};
115
116static int __init wm8350_i2c_init(void)
117{
118	return i2c_add_driver(&wm8350_i2c_driver);
119}
120/* init early so consumer devices can complete system boot */
121subsys_initcall(wm8350_i2c_init);
122
123static void __exit wm8350_i2c_exit(void)
124{
125	i2c_del_driver(&wm8350_i2c_driver);
126}
127module_exit(wm8350_i2c_exit);
128
129MODULE_DESCRIPTION("I2C support for the WM8350 AudioPlus PMIC");
130MODULE_LICENSE("GPL");

 1// SPDX-License-Identifier: GPL-2.0-or-later
 2/*
 3 * wm8350-i2c.c  --  Generic I2C driver for Wolfson WM8350 PMIC
 4 *
 5 * Copyright 2007, 2008 Wolfson Microelectronics PLC.
 6 *
 7 * Author: Liam Girdwood
 8 *         linux@wolfsonmicro.com
 
 
 
 
 
 
 9 */
10
11#include <linux/err.h>
 
12#include <linux/init.h>
13#include <linux/i2c.h>
14#include <linux/platform_device.h>
15#include <linux/mfd/wm8350/core.h>
16#include <linux/regmap.h>
17#include <linux/slab.h>
18
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
19static int wm8350_i2c_probe(struct i2c_client *i2c,
20			    const struct i2c_device_id *id)
21{
22	struct wm8350 *wm8350;
23	struct wm8350_platform_data *pdata = dev_get_platdata(&i2c->dev);
24	int ret = 0;
25
26	wm8350 = devm_kzalloc(&i2c->dev, sizeof(struct wm8350), GFP_KERNEL);
27	if (wm8350 == NULL)
28		return -ENOMEM;
29
30	wm8350->regmap = devm_regmap_init_i2c(i2c, &wm8350_regmap);
31	if (IS_ERR(wm8350->regmap)) {
32		ret = PTR_ERR(wm8350->regmap);
33		dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
34			ret);
35		return ret;
36	}
37
38	i2c_set_clientdata(i2c, wm8350);
39	wm8350->dev = &i2c->dev;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
40
41	return wm8350_device_init(wm8350, i2c->irq, pdata);
42}
43
44static const struct i2c_device_id wm8350_i2c_id[] = {
45	{ "wm8350", 0 },
46	{ "wm8351", 0 },
47	{ "wm8352", 0 },
48	{ }
49};
 
 
50
51static struct i2c_driver wm8350_i2c_driver = {
52	.driver = {
53		   .name = "wm8350",
54		   .suppress_bind_attrs = true,
55	},
56	.probe = wm8350_i2c_probe,
 
57	.id_table = wm8350_i2c_id,
58};
59
60static int __init wm8350_i2c_init(void)
61{
62	return i2c_add_driver(&wm8350_i2c_driver);
63}
64/* init early so consumer devices can complete system boot */
65subsys_initcall(wm8350_i2c_init);