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1/*
2 * SPI access driver for TI TPS65912x PMICs
3 *
4 * Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/
5 * Andrew F. Davis <afd@ti.com>
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
12 * kind, whether expressed or implied; without even the implied warranty
13 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License version 2 for more details.
15 *
16 * Based on the TPS65218 driver and the previous TPS65912 driver by
17 * Margarita Olaya Cabrera <magi@slimlogic.co.uk>
18 */
19
20#include <linux/module.h>
21#include <linux/regmap.h>
22#include <linux/spi/spi.h>
23
24#include <linux/mfd/tps65912.h>
25
26static const struct of_device_id tps65912_spi_of_match_table[] = {
27 { .compatible = "ti,tps65912", },
28 { /* sentinel */ }
29};
30
31static int tps65912_spi_probe(struct spi_device *spi)
32{
33 struct tps65912 *tps;
34
35 tps = devm_kzalloc(&spi->dev, sizeof(*tps), GFP_KERNEL);
36 if (!tps)
37 return -ENOMEM;
38
39 spi_set_drvdata(spi, tps);
40 tps->dev = &spi->dev;
41 tps->irq = spi->irq;
42
43 tps->regmap = devm_regmap_init_spi(spi, &tps65912_regmap_config);
44 if (IS_ERR(tps->regmap)) {
45 dev_err(tps->dev, "Failed to initialize register map\n");
46 return PTR_ERR(tps->regmap);
47 }
48
49 return tps65912_device_init(tps);
50}
51
52static int tps65912_spi_remove(struct spi_device *client)
53{
54 struct tps65912 *tps = spi_get_drvdata(client);
55
56 return tps65912_device_exit(tps);
57}
58
59static const struct spi_device_id tps65912_spi_id_table[] = {
60 { "tps65912", 0 },
61 { /* sentinel */ }
62};
63MODULE_DEVICE_TABLE(spi, tps65912_spi_id_table);
64
65static struct spi_driver tps65912_spi_driver = {
66 .driver = {
67 .name = "tps65912",
68 .of_match_table = tps65912_spi_of_match_table,
69 },
70 .probe = tps65912_spi_probe,
71 .remove = tps65912_spi_remove,
72 .id_table = tps65912_spi_id_table,
73};
74module_spi_driver(tps65912_spi_driver);
75
76MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
77MODULE_DESCRIPTION("TPS65912x SPI Interface Driver");
78MODULE_LICENSE("GPL v2");
1/*
2 * tps65912-spi.c -- SPI access for TI TPS65912x PMIC
3 *
4 * Copyright 2011 Texas Instruments Inc.
5 *
6 * Author: Margarita Olaya Cabrera <magi@slimlogic.co.uk>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
12 *
13 * This driver is based on wm8350 implementation.
14 */
15
16#include <linux/module.h>
17#include <linux/moduleparam.h>
18#include <linux/init.h>
19#include <linux/slab.h>
20#include <linux/gpio.h>
21#include <linux/spi/spi.h>
22#include <linux/mfd/core.h>
23#include <linux/mfd/tps65912.h>
24
25static int tps65912_spi_write(struct tps65912 *tps65912, u8 addr,
26 int bytes, void *src)
27{
28 struct spi_device *spi = tps65912->control_data;
29 u8 *data = (u8 *) src;
30 int ret;
31 /* bit 23 is the read/write bit */
32 unsigned long spi_data = 1 << 23 | addr << 15 | *data;
33 struct spi_transfer xfer;
34 struct spi_message msg;
35 u32 tx_buf, rx_buf;
36
37 tx_buf = spi_data;
38 rx_buf = 0;
39
40 xfer.tx_buf = &tx_buf;
41 xfer.rx_buf = NULL;
42 xfer.len = sizeof(unsigned long);
43 xfer.bits_per_word = 24;
44
45 spi_message_init(&msg);
46 spi_message_add_tail(&xfer, &msg);
47
48 ret = spi_sync(spi, &msg);
49 return ret;
50}
51
52static int tps65912_spi_read(struct tps65912 *tps65912, u8 addr,
53 int bytes, void *dest)
54{
55 struct spi_device *spi = tps65912->control_data;
56 /* bit 23 is the read/write bit */
57 unsigned long spi_data = 0 << 23 | addr << 15;
58 struct spi_transfer xfer;
59 struct spi_message msg;
60 int ret;
61 u8 *data = (u8 *) dest;
62 u32 tx_buf, rx_buf;
63
64 tx_buf = spi_data;
65 rx_buf = 0;
66
67 xfer.tx_buf = &tx_buf;
68 xfer.rx_buf = &rx_buf;
69 xfer.len = sizeof(unsigned long);
70 xfer.bits_per_word = 24;
71
72 spi_message_init(&msg);
73 spi_message_add_tail(&xfer, &msg);
74
75 if (spi == NULL)
76 return 0;
77
78 ret = spi_sync(spi, &msg);
79 if (ret == 0)
80 *data = (u8) (rx_buf & 0xFF);
81 return ret;
82}
83
84static int __devinit tps65912_spi_probe(struct spi_device *spi)
85{
86 struct tps65912 *tps65912;
87
88 tps65912 = kzalloc(sizeof(struct tps65912), GFP_KERNEL);
89 if (tps65912 == NULL)
90 return -ENOMEM;
91
92 tps65912->dev = &spi->dev;
93 tps65912->control_data = spi;
94 tps65912->read = tps65912_spi_read;
95 tps65912->write = tps65912_spi_write;
96
97 spi_set_drvdata(spi, tps65912);
98
99 return tps65912_device_init(tps65912);
100}
101
102static int __devexit tps65912_spi_remove(struct spi_device *spi)
103{
104 struct tps65912 *tps65912 = spi_get_drvdata(spi);
105
106 tps65912_device_exit(tps65912);
107
108 return 0;
109}
110
111static struct spi_driver tps65912_spi_driver = {
112 .driver = {
113 .name = "tps65912",
114 .owner = THIS_MODULE,
115 },
116 .probe = tps65912_spi_probe,
117 .remove = __devexit_p(tps65912_spi_remove),
118};
119
120static int __init tps65912_spi_init(void)
121{
122 int ret;
123
124 ret = spi_register_driver(&tps65912_spi_driver);
125 if (ret != 0)
126 pr_err("Failed to register TPS65912 SPI driver: %d\n", ret);
127
128 return 0;
129}
130/* init early so consumer devices can complete system boot */
131subsys_initcall(tps65912_spi_init);
132
133static void __exit tps65912_spi_exit(void)
134{
135 spi_unregister_driver(&tps65912_spi_driver);
136}
137module_exit(tps65912_spi_exit);
138
139MODULE_AUTHOR("Margarita Olaya <magi@slimlogic.co.uk>");
140MODULE_DESCRIPTION("SPI support for TPS65912 chip family mfd");
141MODULE_LICENSE("GPL");