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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Core driver for TPS61050/61052 boost converters, used for while LED4 * driving, audio power amplification, white LED flash, and generic5 * 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 as7 * flashgun.8 *9 * Copyright (C) 2011 ST-Ericsson SA10 * Written on behalf of Linaro for ST-Ericsson11 *12 * Author: Linus Walleij <linus.walleij@linaro.org>13 */14 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>25 26static const struct regmap_config tps6105x_regmap_config = {27 .reg_bits = 8,28 .val_bits = 8,29 .max_register = TPS6105X_REG_3,30};31 32static int tps6105x_startup(struct tps6105x *tps6105x)33{34 int ret;35 unsigned int regval;36 37 ret = regmap_read(tps6105x->regmap, TPS6105X_REG_0, ®val);38 if (ret)39 return ret;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");44 break;45 case TPS6105X_REG0_MODE_TORCH:46 dev_info(&tps6105x->client->dev,47 "TPS6105x found in TORCH mode\n");48 break;49 case TPS6105X_REG0_MODE_TORCH_FLASH:50 dev_info(&tps6105x->client->dev,51 "TPS6105x found in FLASH mode\n");52 break;53 case TPS6105X_REG0_MODE_VOLTAGE:54 dev_info(&tps6105x->client->dev,55 "TPS6105x found in VOLTAGE mode\n");56 break;57 default:58 break;59 }60 61 return ret;62}63 64/*65 * MFD cells - we always have a GPIO cell and we have one cell66 * which is selected operation mode.67 */68static struct mfd_cell tps6105x_gpio_cell = {69 .name = "tps6105x-gpio",70};71 72static struct mfd_cell tps6105x_leds_cell = {73 .name = "tps6105x-leds",74};75 76static struct mfd_cell tps6105x_flash_cell = {77 .name = "tps6105x-flash",78};79 80static struct mfd_cell tps6105x_regulator_cell = {81 .name = "tps6105x-regulator",82};83 84static int tps6105x_add_device(struct tps6105x *tps6105x,85 struct mfd_cell *cell)86{87 cell->platform_data = tps6105x;88 cell->pdata_size = sizeof(*tps6105x);89 90 return mfd_add_devices(&tps6105x->client->dev,91 PLATFORM_DEVID_AUTO, cell, 1, NULL, 0, NULL);92}93 94static struct tps6105x_platform_data *tps6105x_parse_dt(struct device *dev)95{96 struct device_node *np = dev->of_node;97 struct tps6105x_platform_data *pdata;98 struct device_node *child;99 100 if (!np)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);105 }106 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);107 if (!pdata)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;115 }116 117 return pdata;118}119 120static int tps6105x_probe(struct i2c_client *client)121{122 struct tps6105x *tps6105x;123 struct tps6105x_platform_data *pdata;124 int ret;125 126 pdata = dev_get_platdata(&client->dev);127 if (!pdata)128 pdata = tps6105x_parse_dt(&client->dev);129 if (IS_ERR(pdata)) {130 dev_err(&client->dev, "No platform data or DT found");131 return PTR_ERR(pdata);132 }133 134 tps6105x = devm_kmalloc(&client->dev, sizeof(*tps6105x), GFP_KERNEL);135 if (!tps6105x)136 return -ENOMEM;137 138 tps6105x->regmap = devm_regmap_init_i2c(client, &tps6105x_regmap_config);139 if (IS_ERR(tps6105x->regmap))140 return PTR_ERR(tps6105x->regmap);141 142 i2c_set_clientdata(client, tps6105x);143 tps6105x->client = client;144 tps6105x->pdata = pdata;145 146 ret = tps6105x_startup(tps6105x);147 if (ret) {148 dev_err(&client->dev, "chip initialization failed\n");149 return ret;150 }151 152 ret = tps6105x_add_device(tps6105x, &tps6105x_gpio_cell);153 if (ret)154 return ret;155 156 switch (pdata->mode) {157 case TPS6105X_MODE_SHUTDOWN:158 dev_info(&client->dev,159 "present, not used for anything, only GPIO\n");160 break;161 case TPS6105X_MODE_TORCH:162 ret = tps6105x_add_device(tps6105x, &tps6105x_leds_cell);163 break;164 case TPS6105X_MODE_TORCH_FLASH:165 ret = tps6105x_add_device(tps6105x, &tps6105x_flash_cell);166 break;167 case TPS6105X_MODE_VOLTAGE:168 ret = tps6105x_add_device(tps6105x, &tps6105x_regulator_cell);169 break;170 default:171 dev_warn(&client->dev, "invalid mode: %d\n", pdata->mode);172 break;173 }174 175 if (ret)176 mfd_remove_devices(&client->dev);177 178 return ret;179}180 181static void tps6105x_remove(struct i2c_client *client)182{183 struct tps6105x *tps6105x = i2c_get_clientdata(client);184 185 mfd_remove_devices(&client->dev);186 187 /* Put chip in shutdown mode */188 regmap_update_bits(tps6105x->regmap, TPS6105X_REG_0,189 TPS6105X_REG0_MODE_MASK,190 TPS6105X_MODE_SHUTDOWN << TPS6105X_REG0_MODE_SHIFT);191}192 193static const struct i2c_device_id tps6105x_id[] = {194 { "tps61050" },195 { "tps61052" },196 { }197};198MODULE_DEVICE_TABLE(i2c, tps6105x_id);199 200static const struct of_device_id tps6105x_of_match[] = {201 { .compatible = "ti,tps61050" },202 { .compatible = "ti,tps61052" },203 { },204};205MODULE_DEVICE_TABLE(of, tps6105x_of_match);206 207static struct i2c_driver tps6105x_driver = {208 .driver = {209 .name = "tps6105x",210 .of_match_table = tps6105x_of_match,211 },212 .probe = tps6105x_probe,213 .remove = tps6105x_remove,214 .id_table = tps6105x_id,215};216 217static int __init tps6105x_init(void)218{219 return i2c_add_driver(&tps6105x_driver);220}221subsys_initcall(tps6105x_init);222 223static void __exit tps6105x_exit(void)224{225 i2c_del_driver(&tps6105x_driver);226}227module_exit(tps6105x_exit);228 229MODULE_AUTHOR("Linus Walleij");230MODULE_DESCRIPTION("TPS6105x White LED Boost Converter Driver");231MODULE_LICENSE("GPL v2");232