xref: /kernel/linux/linux-6.6/drivers/mfd/tps6507x.c (revision 62306a36) 
1/*
2 * tps6507x.c  --  TPS6507x chip family multi-function driver
3 *
4 *  Copyright (c) 2010 RidgeRun (todd.fischer@ridgerun.com)
5 *
6 * Author: Todd Fischer
7 *         todd.fischer@ridgerun.com
8 *
9 * Credits:
10 *
11 *    Using code from wm831x-*.c, wm8400-core, Wolfson Microelectronics PLC.
12 *
13 * For licencing details see kernel-base/COPYING
14 *
15 */
16
17#include <linux/module.h>
18#include <linux/moduleparam.h>
19#include <linux/init.h>
20#include <linux/slab.h>
21#include <linux/i2c.h>
22#include <linux/of.h>
23#include <linux/mfd/core.h>
24#include <linux/mfd/tps6507x.h>
25
26static const struct mfd_cell tps6507x_devs[] = {
27	{
28		.name = "tps6507x-pmic",
29	},
30	{
31		.name = "tps6507x-ts",
32	},
33};
34
35
36static int tps6507x_i2c_read_device(struct tps6507x_dev *tps6507x, char reg,
37				  int bytes, void *dest)
38{
39	struct i2c_client *i2c = tps6507x->i2c_client;
40	struct i2c_msg xfer[2];
41	int ret;
42
43	/* Write register */
44	xfer[0].addr = i2c->addr;
45	xfer[0].flags = 0;
46	xfer[0].len = 1;
47	xfer[0].buf = &reg;
48
49	/* Read data */
50	xfer[1].addr = i2c->addr;
51	xfer[1].flags = I2C_M_RD;
52	xfer[1].len = bytes;
53	xfer[1].buf = dest;
54
55	ret = i2c_transfer(i2c->adapter, xfer, 2);
56	if (ret == 2)
57		ret = 0;
58	else if (ret >= 0)
59		ret = -EIO;
60
61	return ret;
62}
63
64static int tps6507x_i2c_write_device(struct tps6507x_dev *tps6507x, char reg,
65				   int bytes, void *src)
66{
67	struct i2c_client *i2c = tps6507x->i2c_client;
68	/* we add 1 byte for device register */
69	u8 msg[TPS6507X_MAX_REGISTER + 1];
70	int ret;
71
72	if (bytes > TPS6507X_MAX_REGISTER)
73		return -EINVAL;
74
75	msg[0] = reg;
76	memcpy(&msg[1], src, bytes);
77
78	ret = i2c_master_send(i2c, msg, bytes + 1);
79	if (ret < 0)
80		return ret;
81	if (ret != bytes + 1)
82		return -EIO;
83	return 0;
84}
85
86static int tps6507x_i2c_probe(struct i2c_client *i2c)
87{
88	struct tps6507x_dev *tps6507x;
89
90	tps6507x = devm_kzalloc(&i2c->dev, sizeof(struct tps6507x_dev),
91				GFP_KERNEL);
92	if (tps6507x == NULL)
93		return -ENOMEM;
94
95	i2c_set_clientdata(i2c, tps6507x);
96	tps6507x->dev = &i2c->dev;
97	tps6507x->i2c_client = i2c;
98	tps6507x->read_dev = tps6507x_i2c_read_device;
99	tps6507x->write_dev = tps6507x_i2c_write_device;
100
101	return devm_mfd_add_devices(tps6507x->dev, -1, tps6507x_devs,
102				    ARRAY_SIZE(tps6507x_devs), NULL, 0, NULL);
103}
104
105static const struct i2c_device_id tps6507x_i2c_id[] = {
106	{ "tps6507x", 0 },
107	{ }
108};
109MODULE_DEVICE_TABLE(i2c, tps6507x_i2c_id);
110
111#ifdef CONFIG_OF
112static const struct of_device_id tps6507x_of_match[] = {
113	{.compatible = "ti,tps6507x", },
114	{},
115};
116MODULE_DEVICE_TABLE(of, tps6507x_of_match);
117#endif
118
119static struct i2c_driver tps6507x_i2c_driver = {
120	.driver = {
121		   .name = "tps6507x",
122		   .of_match_table = of_match_ptr(tps6507x_of_match),
123	},
124	.probe = tps6507x_i2c_probe,
125	.id_table = tps6507x_i2c_id,
126};
127
128static int __init tps6507x_i2c_init(void)
129{
130	return i2c_add_driver(&tps6507x_i2c_driver);
131}
132/* init early so consumer devices can complete system boot */
133subsys_initcall(tps6507x_i2c_init);
134
135static void __exit tps6507x_i2c_exit(void)
136{
137	i2c_del_driver(&tps6507x_i2c_driver);
138}
139module_exit(tps6507x_i2c_exit);
140
141MODULE_DESCRIPTION("TPS6507x chip family multi-function driver");
142MODULE_LICENSE("GPL");
143