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234 lines
5.7 KiB
234 lines
5.7 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Core driver for TPS61050/61052 boost converters, used for while LED |
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* driving, audio power amplification, white LED flash, and generic |
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* boost conversion. Additionally it provides a 1-bit GPIO pin (out or in) |
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* and a flash synchronization pin to synchronize flash events when used as |
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* flashgun. |
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* |
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* Copyright (C) 2011 ST-Ericsson SA |
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* Written on behalf of Linaro for ST-Ericsson |
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* |
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* Author: Linus Walleij <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/i2c.h> |
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#include <linux/regmap.h> |
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#include <linux/gpio.h> |
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#include <linux/spinlock.h> |
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#include <linux/slab.h> |
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#include <linux/err.h> |
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#include <linux/mfd/core.h> |
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#include <linux/mfd/tps6105x.h> |
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static struct regmap_config tps6105x_regmap_config = { |
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.reg_bits = 8, |
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.val_bits = 8, |
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.max_register = TPS6105X_REG_3, |
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}; |
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static int tps6105x_startup(struct tps6105x *tps6105x) |
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{ |
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int ret; |
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unsigned int regval; |
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ret = regmap_read(tps6105x->regmap, TPS6105X_REG_0, ®val); |
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if (ret) |
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return ret; |
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switch (regval >> TPS6105X_REG0_MODE_SHIFT) { |
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case TPS6105X_REG0_MODE_SHUTDOWN: |
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dev_info(&tps6105x->client->dev, |
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"TPS6105x found in SHUTDOWN mode\n"); |
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break; |
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case TPS6105X_REG0_MODE_TORCH: |
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dev_info(&tps6105x->client->dev, |
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"TPS6105x found in TORCH mode\n"); |
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break; |
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case TPS6105X_REG0_MODE_TORCH_FLASH: |
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dev_info(&tps6105x->client->dev, |
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"TPS6105x found in FLASH mode\n"); |
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break; |
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case TPS6105X_REG0_MODE_VOLTAGE: |
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dev_info(&tps6105x->client->dev, |
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"TPS6105x found in VOLTAGE mode\n"); |
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break; |
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default: |
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break; |
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} |
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return ret; |
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} |
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/* |
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* MFD cells - we always have a GPIO cell and we have one cell |
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* which is selected operation mode. |
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*/ |
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static struct mfd_cell tps6105x_gpio_cell = { |
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.name = "tps6105x-gpio", |
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}; |
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static struct mfd_cell tps6105x_leds_cell = { |
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.name = "tps6105x-leds", |
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}; |
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static struct mfd_cell tps6105x_flash_cell = { |
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.name = "tps6105x-flash", |
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}; |
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static struct mfd_cell tps6105x_regulator_cell = { |
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.name = "tps6105x-regulator", |
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}; |
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static int tps6105x_add_device(struct tps6105x *tps6105x, |
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struct mfd_cell *cell) |
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{ |
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cell->platform_data = tps6105x; |
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cell->pdata_size = sizeof(*tps6105x); |
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return mfd_add_devices(&tps6105x->client->dev, |
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PLATFORM_DEVID_AUTO, cell, 1, NULL, 0, NULL); |
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} |
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static struct tps6105x_platform_data *tps6105x_parse_dt(struct device *dev) |
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{ |
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struct device_node *np = dev->of_node; |
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struct tps6105x_platform_data *pdata; |
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struct device_node *child; |
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if (!np) |
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return ERR_PTR(-EINVAL); |
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if (of_get_available_child_count(np) > 1) { |
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dev_err(dev, "cannot support multiple operational modes"); |
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return ERR_PTR(-EINVAL); |
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} |
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pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); |
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if (!pdata) |
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return ERR_PTR(-ENOMEM); |
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pdata->mode = TPS6105X_MODE_SHUTDOWN; |
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for_each_available_child_of_node(np, child) { |
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if (child->name && !of_node_cmp(child->name, "regulator")) |
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pdata->mode = TPS6105X_MODE_VOLTAGE; |
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else if (child->name && !of_node_cmp(child->name, "led")) |
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pdata->mode = TPS6105X_MODE_TORCH; |
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} |
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return pdata; |
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} |
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static int tps6105x_probe(struct i2c_client *client, |
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const struct i2c_device_id *id) |
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{ |
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struct tps6105x *tps6105x; |
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struct tps6105x_platform_data *pdata; |
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int ret; |
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pdata = dev_get_platdata(&client->dev); |
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if (!pdata) |
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pdata = tps6105x_parse_dt(&client->dev); |
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if (IS_ERR(pdata)) { |
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dev_err(&client->dev, "No platform data or DT found"); |
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return PTR_ERR(pdata); |
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} |
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tps6105x = devm_kmalloc(&client->dev, sizeof(*tps6105x), GFP_KERNEL); |
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if (!tps6105x) |
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return -ENOMEM; |
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tps6105x->regmap = devm_regmap_init_i2c(client, &tps6105x_regmap_config); |
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if (IS_ERR(tps6105x->regmap)) |
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return PTR_ERR(tps6105x->regmap); |
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i2c_set_clientdata(client, tps6105x); |
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tps6105x->client = client; |
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tps6105x->pdata = pdata; |
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ret = tps6105x_startup(tps6105x); |
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if (ret) { |
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dev_err(&client->dev, "chip initialization failed\n"); |
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return ret; |
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} |
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ret = tps6105x_add_device(tps6105x, &tps6105x_gpio_cell); |
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if (ret) |
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return ret; |
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switch (pdata->mode) { |
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case TPS6105X_MODE_SHUTDOWN: |
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dev_info(&client->dev, |
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"present, not used for anything, only GPIO\n"); |
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break; |
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case TPS6105X_MODE_TORCH: |
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ret = tps6105x_add_device(tps6105x, &tps6105x_leds_cell); |
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break; |
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case TPS6105X_MODE_TORCH_FLASH: |
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ret = tps6105x_add_device(tps6105x, &tps6105x_flash_cell); |
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break; |
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case TPS6105X_MODE_VOLTAGE: |
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ret = tps6105x_add_device(tps6105x, &tps6105x_regulator_cell); |
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break; |
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default: |
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dev_warn(&client->dev, "invalid mode: %d\n", pdata->mode); |
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break; |
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} |
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if (ret) |
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mfd_remove_devices(&client->dev); |
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return ret; |
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} |
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static int tps6105x_remove(struct i2c_client *client) |
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{ |
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struct tps6105x *tps6105x = i2c_get_clientdata(client); |
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mfd_remove_devices(&client->dev); |
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/* Put chip in shutdown mode */ |
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regmap_update_bits(tps6105x->regmap, TPS6105X_REG_0, |
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TPS6105X_REG0_MODE_MASK, |
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TPS6105X_MODE_SHUTDOWN << TPS6105X_REG0_MODE_SHIFT); |
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return 0; |
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} |
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static const struct i2c_device_id tps6105x_id[] = { |
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{ "tps61050", 0 }, |
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{ "tps61052", 0 }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(i2c, tps6105x_id); |
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static const struct of_device_id tps6105x_of_match[] = { |
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{ .compatible = "ti,tps61050" }, |
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{ .compatible = "ti,tps61052" }, |
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{ }, |
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}; |
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MODULE_DEVICE_TABLE(of, tps6105x_of_match); |
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static struct i2c_driver tps6105x_driver = { |
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.driver = { |
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.name = "tps6105x", |
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.of_match_table = tps6105x_of_match, |
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}, |
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.probe = tps6105x_probe, |
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.remove = tps6105x_remove, |
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.id_table = tps6105x_id, |
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}; |
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static int __init tps6105x_init(void) |
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{ |
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return i2c_add_driver(&tps6105x_driver); |
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} |
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subsys_initcall(tps6105x_init); |
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static void __exit tps6105x_exit(void) |
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{ |
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i2c_del_driver(&tps6105x_driver); |
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} |
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module_exit(tps6105x_exit); |
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MODULE_AUTHOR("Linus Walleij"); |
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MODULE_DESCRIPTION("TPS6105x White LED Boost Converter Driver"); |
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MODULE_LICENSE("GPL v2");
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