xref: /kernel/linux/linux-5.10/drivers/mfd/tps6507x.c (revision 8c2ecf20) 
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/of_device.h>
24#include <linux/mfd/core.h>
25#include <linux/mfd/tps6507x.h>
26
27static const struct mfd_cell tps6507x_devs[] = {
28	{
29		.name = "tps6507x-pmic",
30	},
31	{
32		.name = "tps6507x-ts",
33	},
34};
35
36
37static int tps6507x_i2c_read_device(struct tps6507x_dev *tps6507x, char reg,
38				  int bytes, void *dest)
39{
40	struct i2c_client *i2c = tps6507x->i2c_client;
41	struct i2c_msg xfer[2];
42	int ret;
43
44	/* Write register */
45	xfer[0].addr = i2c->addr;
46	xfer[0].flags = 0;
47	xfer[0].len = 1;
48	xfer[0].buf = &reg;
49
50	/* Read data */
51	xfer[1].addr = i2c->addr;
52	xfer[1].flags = I2C_M_RD;
53	xfer[1].len = bytes;
54	xfer[1].buf = dest;
55
56	ret = i2c_transfer(i2c->adapter, xfer, 2);
57	if (ret == 2)
58		ret = 0;
59	else if (ret >= 0)
60		ret = -EIO;
61
62	return ret;
63}
64
65static int tps6507x_i2c_write_device(struct tps6507x_dev *tps6507x, char reg,
66				   int bytes, void *src)
67{
68	struct i2c_client *i2c = tps6507x->i2c_client;
69	/* we add 1 byte for device register */
70	u8 msg[TPS6507X_MAX_REGISTER + 1];
71	int ret;
72
73	if (bytes > TPS6507X_MAX_REGISTER)
74		return -EINVAL;
75
76	msg[0] = reg;
77	memcpy(&msg[1], src, bytes);
78
79	ret = i2c_master_send(i2c, msg, bytes + 1);
80	if (ret < 0)
81		return ret;
82	if (ret != bytes + 1)
83		return -EIO;
84	return 0;
85}
86
87static int tps6507x_i2c_probe(struct i2c_client *i2c,
88			    const struct i2c_device_id *id)
89{
90	struct tps6507x_dev *tps6507x;
91
92	tps6507x = devm_kzalloc(&i2c->dev, sizeof(struct tps6507x_dev),
93				GFP_KERNEL);
94	if (tps6507x == NULL)
95		return -ENOMEM;
96
97	i2c_set_clientdata(i2c, tps6507x);
98	tps6507x->dev = &i2c->dev;
99	tps6507x->i2c_client = i2c;
100	tps6507x->read_dev = tps6507x_i2c_read_device;
101	tps6507x->write_dev = tps6507x_i2c_write_device;
102
103	return devm_mfd_add_devices(tps6507x->dev, -1, tps6507x_devs,
104				    ARRAY_SIZE(tps6507x_devs), NULL, 0, NULL);
105}
106
107static const struct i2c_device_id tps6507x_i2c_id[] = {
108	{ "tps6507x", 0 },
109	{ }
110};
111MODULE_DEVICE_TABLE(i2c, tps6507x_i2c_id);
112
113#ifdef CONFIG_OF
114static const struct of_device_id tps6507x_of_match[] = {
115	{.compatible = "ti,tps6507x", },
116	{},
117};
118MODULE_DEVICE_TABLE(of, tps6507x_of_match);
119#endif
120
121static struct i2c_driver tps6507x_i2c_driver = {
122	.driver = {
123		   .name = "tps6507x",
124		   .of_match_table = of_match_ptr(tps6507x_of_match),
125	},
126	.probe = tps6507x_i2c_probe,
127	.id_table = tps6507x_i2c_id,
128};
129
130static int __init tps6507x_i2c_init(void)
131{
132	return i2c_add_driver(&tps6507x_i2c_driver);
133}
134/* init early so consumer devices can complete system boot */
135subsys_initcall(tps6507x_i2c_init);
136
137static void __exit tps6507x_i2c_exit(void)
138{
139	i2c_del_driver(&tps6507x_i2c_driver);
140}
141module_exit(tps6507x_i2c_exit);
142
143MODULE_DESCRIPTION("TPS6507x chip family multi-function driver");
144MODULE_LICENSE("GPL");
145