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
8 * Copyright (C) 2011 ST-Ericsson SA
9 * Written on behalf of Linaro for ST-Ericsson
11 * Author: Linus Walleij <linus.walleij@linaro.org>
13 * License terms: GNU General Public License (GPL) version 2
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/regulator/driver.h>
25 #include <linux/mfd/core.h>
26 #include <linux/mfd/tps6105x.h>
28 static struct regmap_config tps6105x_regmap_config = {
31 .max_register = TPS6105X_REG_3,
34 static int tps6105x_startup(struct tps6105x *tps6105x)
39 ret = regmap_read(tps6105x->regmap, TPS6105X_REG_0, ®val);
42 switch (regval >> TPS6105X_REG0_MODE_SHIFT) {
43 case TPS6105X_REG0_MODE_SHUTDOWN:
44 dev_info(&tps6105x->client->dev,
45 "TPS6105x found in SHUTDOWN mode\n");
47 case TPS6105X_REG0_MODE_TORCH:
48 dev_info(&tps6105x->client->dev,
49 "TPS6105x found in TORCH mode\n");
51 case TPS6105X_REG0_MODE_TORCH_FLASH:
52 dev_info(&tps6105x->client->dev,
53 "TPS6105x found in FLASH mode\n");
55 case TPS6105X_REG0_MODE_VOLTAGE:
56 dev_info(&tps6105x->client->dev,
57 "TPS6105x found in VOLTAGE mode\n");
67 * MFD cells - we always have a GPIO cell and we have one cell
68 * which is selected operation mode.
70 static struct mfd_cell tps6105x_gpio_cell = {
71 .name = "tps6105x-gpio",
74 static struct mfd_cell tps6105x_leds_cell = {
75 .name = "tps6105x-leds",
78 static struct mfd_cell tps6105x_flash_cell = {
79 .name = "tps6105x-flash",
82 static struct mfd_cell tps6105x_regulator_cell = {
83 .name = "tps6105x-regulator",
86 static int tps6105x_add_device(struct tps6105x *tps6105x,
87 struct mfd_cell *cell)
89 cell->platform_data = tps6105x;
90 cell->pdata_size = sizeof(*tps6105x);
92 return mfd_add_devices(&tps6105x->client->dev,
93 PLATFORM_DEVID_AUTO, cell, 1, NULL, 0, NULL);
96 static int tps6105x_probe(struct i2c_client *client,
97 const struct i2c_device_id *id)
99 struct tps6105x *tps6105x;
100 struct tps6105x_platform_data *pdata;
103 pdata = dev_get_platdata(&client->dev);
105 dev_err(&client->dev, "missing platform data\n");
109 tps6105x = devm_kmalloc(&client->dev, sizeof(*tps6105x), GFP_KERNEL);
113 tps6105x->regmap = devm_regmap_init_i2c(client, &tps6105x_regmap_config);
114 if (IS_ERR(tps6105x->regmap))
115 return PTR_ERR(tps6105x->regmap);
117 i2c_set_clientdata(client, tps6105x);
118 tps6105x->client = client;
119 tps6105x->pdata = pdata;
121 ret = tps6105x_startup(tps6105x);
123 dev_err(&client->dev, "chip initialization failed\n");
127 ret = tps6105x_add_device(tps6105x, &tps6105x_gpio_cell);
131 switch (pdata->mode) {
132 case TPS6105X_MODE_SHUTDOWN:
133 dev_info(&client->dev,
134 "present, not used for anything, only GPIO\n");
136 case TPS6105X_MODE_TORCH:
137 ret = tps6105x_add_device(tps6105x, &tps6105x_leds_cell);
139 case TPS6105X_MODE_TORCH_FLASH:
140 ret = tps6105x_add_device(tps6105x, &tps6105x_flash_cell);
142 case TPS6105X_MODE_VOLTAGE:
143 ret = tps6105x_add_device(tps6105x, &tps6105x_regulator_cell);
146 dev_warn(&client->dev, "invalid mode: %d\n", pdata->mode);
151 mfd_remove_devices(&client->dev);
156 static int tps6105x_remove(struct i2c_client *client)
158 struct tps6105x *tps6105x = i2c_get_clientdata(client);
160 mfd_remove_devices(&client->dev);
162 /* Put chip in shutdown mode */
163 regmap_update_bits(tps6105x->regmap, TPS6105X_REG_0,
164 TPS6105X_REG0_MODE_MASK,
165 TPS6105X_MODE_SHUTDOWN << TPS6105X_REG0_MODE_SHIFT);
170 static const struct i2c_device_id tps6105x_id[] = {
175 MODULE_DEVICE_TABLE(i2c, tps6105x_id);
177 static struct i2c_driver tps6105x_driver = {
181 .probe = tps6105x_probe,
182 .remove = tps6105x_remove,
183 .id_table = tps6105x_id,
186 static int __init tps6105x_init(void)
188 return i2c_add_driver(&tps6105x_driver);
190 subsys_initcall(tps6105x_init);
192 static void __exit tps6105x_exit(void)
194 i2c_del_driver(&tps6105x_driver);
196 module_exit(tps6105x_exit);
198 MODULE_AUTHOR("Linus Walleij");
199 MODULE_DESCRIPTION("TPS6105x White LED Boost Converter Driver");
200 MODULE_LICENSE("GPL v2");