1/*
2 * Core driver for TPS61050/61052 boost converters, used for while LED
3 * driving, audio power amplification, white LED flash, and generic
4 * boost conversion. Additionally it provides a 1-bit GPIO pin (out or in)
5 * and a flash synchronization pin to synchronize flash events when used as
6 * flashgun.
7 *
8 * Copyright (C) 2011 ST-Ericsson SA
9 * Written on behalf of Linaro for ST-Ericsson
10 *
11 * Author: Linus Walleij <linus.walleij@linaro.org>
12 *
13 * License terms: GNU General Public License (GPL) version 2
14 */
15
16#include <linux/module.h>
17#include <linux/init.h>
18#include <linux/i2c.h>
19#include <linux/regmap.h>
20#include <linux/gpio.h>
21#include <linux/spinlock.h>
22#include <linux/slab.h>
23#include <linux/err.h>
24#include <linux/mfd/core.h>
25#include <linux/mfd/tps6105x.h>
26
27static struct regmap_config tps6105x_regmap_config = {
28 .reg_bits = 8,
29 .val_bits = 8,
30 .max_register = TPS6105X_REG_3,
31};
32
33static int tps6105x_startup(struct tps6105x *tps6105x)
34{
35 int ret;
36 unsigned int regval;
37
38 ret = regmap_read(tps6105x->regmap, TPS6105X_REG_0, &regval);
39 if (ret)
40 return ret;
41 switch (regval >> TPS6105X_REG0_MODE_SHIFT) {
42 case TPS6105X_REG0_MODE_SHUTDOWN:
43 dev_info(&tps6105x->client->dev,
44 "TPS6105x found in SHUTDOWN mode\n");
45 break;
46 case TPS6105X_REG0_MODE_TORCH:
47 dev_info(&tps6105x->client->dev,
48 "TPS6105x found in TORCH mode\n");
49 break;
50 case TPS6105X_REG0_MODE_TORCH_FLASH:
51 dev_info(&tps6105x->client->dev,
52 "TPS6105x found in FLASH mode\n");
53 break;
54 case TPS6105X_REG0_MODE_VOLTAGE:
55 dev_info(&tps6105x->client->dev,
56 "TPS6105x found in VOLTAGE mode\n");
57 break;
58 default:
59 break;
60 }
61
62 return ret;
63}
64
65/*
66 * MFD cells - we always have a GPIO cell and we have one cell
67 * which is selected operation mode.
68 */
69static struct mfd_cell tps6105x_gpio_cell = {
70 .name = "tps6105x-gpio",
71};
72
73static struct mfd_cell tps6105x_leds_cell = {
74 .name = "tps6105x-leds",
75};
76
77static struct mfd_cell tps6105x_flash_cell = {
78 .name = "tps6105x-flash",
79};
80
81static struct mfd_cell tps6105x_regulator_cell = {
82 .name = "tps6105x-regulator",
83};
84
85static int tps6105x_add_device(struct tps6105x *tps6105x,
86 struct mfd_cell *cell)
87{
88 cell->platform_data = tps6105x;
89 cell->pdata_size = sizeof(*tps6105x);
90
91 return mfd_add_devices(&tps6105x->client->dev,
92 PLATFORM_DEVID_AUTO, cell, 1, NULL, 0, NULL);
93}
94
95static int tps6105x_probe(struct i2c_client *client,
96 const struct i2c_device_id *id)
97{
98 struct tps6105x *tps6105x;
99 struct tps6105x_platform_data *pdata;
100 int ret;
101
102 pdata = dev_get_platdata(&client->dev);
103 if (!pdata) {
104 dev_err(&client->dev, "missing platform data\n");
105 return -ENODEV;
106 }
107
108 tps6105x = devm_kmalloc(&client->dev, sizeof(*tps6105x), GFP_KERNEL);
109 if (!tps6105x)
110 return -ENOMEM;
111
112 tps6105x->regmap = devm_regmap_init_i2c(client, &tps6105x_regmap_config);
113 if (IS_ERR(tps6105x->regmap))
114 return PTR_ERR(tps6105x->regmap);
115
116 i2c_set_clientdata(client, tps6105x);
117 tps6105x->client = client;
118 tps6105x->pdata = pdata;
119
120 ret = tps6105x_startup(tps6105x);
121 if (ret) {
122 dev_err(&client->dev, "chip initialization failed\n");
123 return ret;
124 }
125
126 ret = tps6105x_add_device(tps6105x, &tps6105x_gpio_cell);
127 if (ret)
128 return ret;
129
130 switch (pdata->mode) {
131 case TPS6105X_MODE_SHUTDOWN:
132 dev_info(&client->dev,
133 "present, not used for anything, only GPIO\n");
134 break;
135 case TPS6105X_MODE_TORCH:
136 ret = tps6105x_add_device(tps6105x, &tps6105x_leds_cell);
137 break;
138 case TPS6105X_MODE_TORCH_FLASH:
139 ret = tps6105x_add_device(tps6105x, &tps6105x_flash_cell);
140 break;
141 case TPS6105X_MODE_VOLTAGE:
142 ret = tps6105x_add_device(tps6105x, &tps6105x_regulator_cell);
143 break;
144 default:
145 dev_warn(&client->dev, "invalid mode: %d\n", pdata->mode);
146 break;
147 }
148
149 if (ret)
150 mfd_remove_devices(&client->dev);
151
152 return ret;
153}
154
155static int tps6105x_remove(struct i2c_client *client)
156{
157 struct tps6105x *tps6105x = i2c_get_clientdata(client);
158
159 mfd_remove_devices(&client->dev);
160
161 /* Put chip in shutdown mode */
162 regmap_update_bits(tps6105x->regmap, TPS6105X_REG_0,
163 TPS6105X_REG0_MODE_MASK,
164 TPS6105X_MODE_SHUTDOWN << TPS6105X_REG0_MODE_SHIFT);
165
166 return 0;
167}
168
169static const struct i2c_device_id tps6105x_id[] = {
170 { "tps61050", 0 },
171 { "tps61052", 0 },
172 { }
173};
174MODULE_DEVICE_TABLE(i2c, tps6105x_id);
175
176static const struct of_device_id tps6105x_of_match[] = {
177 { .compatible = "ti,tps61050" },
178 { .compatible = "ti,tps61052" },
179 { },
180};
181MODULE_DEVICE_TABLE(of, tps6105x_of_match);
182
183static struct i2c_driver tps6105x_driver = {
184 .driver = {
185 .name = "tps6105x",
186 .of_match_table = tps6105x_of_match,
187 },
188 .probe = tps6105x_probe,
189 .remove = tps6105x_remove,
190 .id_table = tps6105x_id,
191};
192
193static int __init tps6105x_init(void)
194{
195 return i2c_add_driver(&tps6105x_driver);
196}
197subsys_initcall(tps6105x_init);
198
199static void __exit tps6105x_exit(void)
200{
201 i2c_del_driver(&tps6105x_driver);
202}
203module_exit(tps6105x_exit);
204
205MODULE_AUTHOR("Linus Walleij");
206MODULE_DESCRIPTION("TPS6105x White LED Boost Converter Driver");
207MODULE_LICENSE("GPL v2");
208