1 // SPDX-License-Identifier: GPL-2.0-only
3 * Core driver for TPS61050/61052 boost converters, used for while LED
4 * driving, audio power amplification, white LED flash, and generic
5 * boost conversion. Additionally it provides a 1-bit GPIO pin (out or in)
6 * and a flash synchronization pin to synchronize flash events when used as
9 * Copyright (C) 2011 ST-Ericsson SA
10 * Written on behalf of Linaro for ST-Ericsson
12 * Author: Linus Walleij <linus.walleij@linaro.org>
15 #include <linux/module.h>
16 #include <linux/init.h>
17 #include <linux/i2c.h>
18 #include <linux/regmap.h>
19 #include <linux/gpio.h>
20 #include <linux/spinlock.h>
21 #include <linux/slab.h>
22 #include <linux/err.h>
23 #include <linux/mfd/core.h>
24 #include <linux/mfd/tps6105x.h>
26 static struct regmap_config tps6105x_regmap_config = {
29 .max_register = TPS6105X_REG_3,
32 static int tps6105x_startup(struct tps6105x *tps6105x)
37 ret = regmap_read(tps6105x->regmap, TPS6105X_REG_0, ®val);
40 switch (regval >> TPS6105X_REG0_MODE_SHIFT) {
41 case TPS6105X_REG0_MODE_SHUTDOWN:
42 dev_info(&tps6105x->client->dev,
43 "TPS6105x found in SHUTDOWN mode\n");
45 case TPS6105X_REG0_MODE_TORCH:
46 dev_info(&tps6105x->client->dev,
47 "TPS6105x found in TORCH mode\n");
49 case TPS6105X_REG0_MODE_TORCH_FLASH:
50 dev_info(&tps6105x->client->dev,
51 "TPS6105x found in FLASH mode\n");
53 case TPS6105X_REG0_MODE_VOLTAGE:
54 dev_info(&tps6105x->client->dev,
55 "TPS6105x found in VOLTAGE mode\n");
65 * MFD cells - we always have a GPIO cell and we have one cell
66 * which is selected operation mode.
68 static struct mfd_cell tps6105x_gpio_cell = {
69 .name = "tps6105x-gpio",
72 static struct mfd_cell tps6105x_leds_cell = {
73 .name = "tps6105x-leds",
76 static struct mfd_cell tps6105x_flash_cell = {
77 .name = "tps6105x-flash",
80 static struct mfd_cell tps6105x_regulator_cell = {
81 .name = "tps6105x-regulator",
84 static int tps6105x_add_device(struct tps6105x *tps6105x,
85 struct mfd_cell *cell)
87 cell->platform_data = tps6105x;
88 cell->pdata_size = sizeof(*tps6105x);
90 return mfd_add_devices(&tps6105x->client->dev,
91 PLATFORM_DEVID_AUTO, cell, 1, NULL, 0, NULL);
94 static struct tps6105x_platform_data *tps6105x_parse_dt(struct device *dev)
96 struct device_node *np = dev->of_node;
97 struct tps6105x_platform_data *pdata;
98 struct device_node *child;
101 return ERR_PTR(-EINVAL);
102 if (of_get_available_child_count(np) > 1) {
103 dev_err(dev, "cannot support multiple operational modes");
104 return ERR_PTR(-EINVAL);
106 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
108 return ERR_PTR(-ENOMEM);
109 pdata->mode = TPS6105X_MODE_SHUTDOWN;
110 for_each_available_child_of_node(np, child) {
111 if (child->name && !of_node_cmp(child->name, "regulator"))
112 pdata->mode = TPS6105X_MODE_VOLTAGE;
113 else if (child->name && !of_node_cmp(child->name, "led"))
114 pdata->mode = TPS6105X_MODE_TORCH;
120 static int tps6105x_probe(struct i2c_client *client,
121 const struct i2c_device_id *id)
123 struct tps6105x *tps6105x;
124 struct tps6105x_platform_data *pdata;
127 pdata = dev_get_platdata(&client->dev);
129 pdata = tps6105x_parse_dt(&client->dev);
131 dev_err(&client->dev, "No platform data or DT found");
132 return PTR_ERR(pdata);
135 tps6105x = devm_kmalloc(&client->dev, sizeof(*tps6105x), GFP_KERNEL);
139 tps6105x->regmap = devm_regmap_init_i2c(client, &tps6105x_regmap_config);
140 if (IS_ERR(tps6105x->regmap))
141 return PTR_ERR(tps6105x->regmap);
143 i2c_set_clientdata(client, tps6105x);
144 tps6105x->client = client;
145 tps6105x->pdata = pdata;
147 ret = tps6105x_startup(tps6105x);
149 dev_err(&client->dev, "chip initialization failed\n");
153 ret = tps6105x_add_device(tps6105x, &tps6105x_gpio_cell);
157 switch (pdata->mode) {
158 case TPS6105X_MODE_SHUTDOWN:
159 dev_info(&client->dev,
160 "present, not used for anything, only GPIO\n");
162 case TPS6105X_MODE_TORCH:
163 ret = tps6105x_add_device(tps6105x, &tps6105x_leds_cell);
165 case TPS6105X_MODE_TORCH_FLASH:
166 ret = tps6105x_add_device(tps6105x, &tps6105x_flash_cell);
168 case TPS6105X_MODE_VOLTAGE:
169 ret = tps6105x_add_device(tps6105x, &tps6105x_regulator_cell);
172 dev_warn(&client->dev, "invalid mode: %d\n", pdata->mode);
177 mfd_remove_devices(&client->dev);
182 static int tps6105x_remove(struct i2c_client *client)
184 struct tps6105x *tps6105x = i2c_get_clientdata(client);
186 mfd_remove_devices(&client->dev);
188 /* Put chip in shutdown mode */
189 regmap_update_bits(tps6105x->regmap, TPS6105X_REG_0,
190 TPS6105X_REG0_MODE_MASK,
191 TPS6105X_MODE_SHUTDOWN << TPS6105X_REG0_MODE_SHIFT);
196 static const struct i2c_device_id tps6105x_id[] = {
201 MODULE_DEVICE_TABLE(i2c, tps6105x_id);
203 static const struct of_device_id tps6105x_of_match[] = {
204 { .compatible = "ti,tps61050" },
205 { .compatible = "ti,tps61052" },
208 MODULE_DEVICE_TABLE(of, tps6105x_of_match);
210 static struct i2c_driver tps6105x_driver = {
213 .of_match_table = tps6105x_of_match,
215 .probe = tps6105x_probe,
216 .remove = tps6105x_remove,
217 .id_table = tps6105x_id,
220 static int __init tps6105x_init(void)
222 return i2c_add_driver(&tps6105x_driver);
224 subsys_initcall(tps6105x_init);
226 static void __exit tps6105x_exit(void)
228 i2c_del_driver(&tps6105x_driver);
230 module_exit(tps6105x_exit);
232 MODULE_AUTHOR("Linus Walleij");
233 MODULE_DESCRIPTION("TPS6105x White LED Boost Converter Driver");
234 MODULE_LICENSE("GPL v2");