diff options
Diffstat (limited to 'drivers/mfd/tps6105x.c')
| -rw-r--r-- | drivers/mfd/tps6105x.c | 231 |
1 files changed, 231 insertions, 0 deletions
diff --git a/drivers/mfd/tps6105x.c b/drivers/mfd/tps6105x.c new file mode 100644 index 000000000..5601f6d0d --- /dev/null +++ b/drivers/mfd/tps6105x.c @@ -0,0 +1,231 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Core driver for TPS61050/61052 boost converters, used for while LED + * driving, audio power amplification, white LED flash, and generic + * boost conversion. Additionally it provides a 1-bit GPIO pin (out or in) + * and a flash synchronization pin to synchronize flash events when used as + * flashgun. + * + * Copyright (C) 2011 ST-Ericsson SA + * Written on behalf of Linaro for ST-Ericsson + * + * Author: Linus Walleij <linus.walleij@linaro.org> + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/i2c.h> +#include <linux/regmap.h> +#include <linux/gpio.h> +#include <linux/spinlock.h> +#include <linux/slab.h> +#include <linux/err.h> +#include <linux/mfd/core.h> +#include <linux/mfd/tps6105x.h> + +static struct regmap_config tps6105x_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = TPS6105X_REG_3, +}; + +static int tps6105x_startup(struct tps6105x *tps6105x) +{ + int ret; + unsigned int regval; + + ret = regmap_read(tps6105x->regmap, TPS6105X_REG_0, ®val); + if (ret) + return ret; + switch (regval >> TPS6105X_REG0_MODE_SHIFT) { + case TPS6105X_REG0_MODE_SHUTDOWN: + dev_info(&tps6105x->client->dev, + "TPS6105x found in SHUTDOWN mode\n"); + break; + case TPS6105X_REG0_MODE_TORCH: + dev_info(&tps6105x->client->dev, + "TPS6105x found in TORCH mode\n"); + break; + case TPS6105X_REG0_MODE_TORCH_FLASH: + dev_info(&tps6105x->client->dev, + "TPS6105x found in FLASH mode\n"); + break; + case TPS6105X_REG0_MODE_VOLTAGE: + dev_info(&tps6105x->client->dev, + "TPS6105x found in VOLTAGE mode\n"); + break; + default: + break; + } + + return ret; +} + +/* + * MFD cells - we always have a GPIO cell and we have one cell + * which is selected operation mode. + */ +static struct mfd_cell tps6105x_gpio_cell = { + .name = "tps6105x-gpio", +}; + +static struct mfd_cell tps6105x_leds_cell = { + .name = "tps6105x-leds", +}; + +static struct mfd_cell tps6105x_flash_cell = { + .name = "tps6105x-flash", +}; + +static struct mfd_cell tps6105x_regulator_cell = { + .name = "tps6105x-regulator", +}; + +static int tps6105x_add_device(struct tps6105x *tps6105x, + struct mfd_cell *cell) +{ + cell->platform_data = tps6105x; + cell->pdata_size = sizeof(*tps6105x); + + return mfd_add_devices(&tps6105x->client->dev, + PLATFORM_DEVID_AUTO, cell, 1, NULL, 0, NULL); +} + +static struct tps6105x_platform_data *tps6105x_parse_dt(struct device *dev) +{ + struct device_node *np = dev->of_node; + struct tps6105x_platform_data *pdata; + struct device_node *child; + + if (!np) + return ERR_PTR(-EINVAL); + if (of_get_available_child_count(np) > 1) { + dev_err(dev, "cannot support multiple operational modes"); + return ERR_PTR(-EINVAL); + } + pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); + if (!pdata) + return ERR_PTR(-ENOMEM); + pdata->mode = TPS6105X_MODE_SHUTDOWN; + for_each_available_child_of_node(np, child) { + if (child->name && !of_node_cmp(child->name, "regulator")) + pdata->mode = TPS6105X_MODE_VOLTAGE; + else if (child->name && !of_node_cmp(child->name, "led")) + pdata->mode = TPS6105X_MODE_TORCH; + } + + return pdata; +} + +static int tps6105x_probe(struct i2c_client *client) +{ + struct tps6105x *tps6105x; + struct tps6105x_platform_data *pdata; + int ret; + + pdata = dev_get_platdata(&client->dev); + if (!pdata) + pdata = tps6105x_parse_dt(&client->dev); + if (IS_ERR(pdata)) { + dev_err(&client->dev, "No platform data or DT found"); + return PTR_ERR(pdata); + } + + tps6105x = devm_kmalloc(&client->dev, sizeof(*tps6105x), GFP_KERNEL); + if (!tps6105x) + return -ENOMEM; + + tps6105x->regmap = devm_regmap_init_i2c(client, &tps6105x_regmap_config); + if (IS_ERR(tps6105x->regmap)) + return PTR_ERR(tps6105x->regmap); + + i2c_set_clientdata(client, tps6105x); + tps6105x->client = client; + tps6105x->pdata = pdata; + + ret = tps6105x_startup(tps6105x); + if (ret) { + dev_err(&client->dev, "chip initialization failed\n"); + return ret; + } + + ret = tps6105x_add_device(tps6105x, &tps6105x_gpio_cell); + if (ret) + return ret; + + switch (pdata->mode) { + case TPS6105X_MODE_SHUTDOWN: + dev_info(&client->dev, + "present, not used for anything, only GPIO\n"); + break; + case TPS6105X_MODE_TORCH: + ret = tps6105x_add_device(tps6105x, &tps6105x_leds_cell); + break; + case TPS6105X_MODE_TORCH_FLASH: + ret = tps6105x_add_device(tps6105x, &tps6105x_flash_cell); + break; + case TPS6105X_MODE_VOLTAGE: + ret = tps6105x_add_device(tps6105x, &tps6105x_regulator_cell); + break; + default: + dev_warn(&client->dev, "invalid mode: %d\n", pdata->mode); + break; + } + + if (ret) + mfd_remove_devices(&client->dev); + + return ret; +} + +static void tps6105x_remove(struct i2c_client *client) +{ + struct tps6105x *tps6105x = i2c_get_clientdata(client); + + mfd_remove_devices(&client->dev); + + /* Put chip in shutdown mode */ + regmap_update_bits(tps6105x->regmap, TPS6105X_REG_0, + TPS6105X_REG0_MODE_MASK, + TPS6105X_MODE_SHUTDOWN << TPS6105X_REG0_MODE_SHIFT); +} + +static const struct i2c_device_id tps6105x_id[] = { + { "tps61050", 0 }, + { "tps61052", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, tps6105x_id); + +static const struct of_device_id tps6105x_of_match[] = { + { .compatible = "ti,tps61050" }, + { .compatible = "ti,tps61052" }, + { }, +}; +MODULE_DEVICE_TABLE(of, tps6105x_of_match); + +static struct i2c_driver tps6105x_driver = { + .driver = { + .name = "tps6105x", + .of_match_table = tps6105x_of_match, + }, + .probe = tps6105x_probe, + .remove = tps6105x_remove, + .id_table = tps6105x_id, +}; + +static int __init tps6105x_init(void) +{ + return i2c_add_driver(&tps6105x_driver); +} +subsys_initcall(tps6105x_init); + +static void __exit tps6105x_exit(void) +{ + i2c_del_driver(&tps6105x_driver); +} +module_exit(tps6105x_exit); + +MODULE_AUTHOR("Linus Walleij"); +MODULE_DESCRIPTION("TPS6105x White LED Boost Converter Driver"); +MODULE_LICENSE("GPL v2"); |