linux/drivers/mfd/tps6105x.c

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// 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, &regval);
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;
}
i2c: Make remove callback return void The value returned by an i2c driver's remove function is mostly ignored. (Only an error message is printed if the value is non-zero that the error is ignored.) So change the prototype of the remove function to return no value. This way driver authors are not tempted to assume that passing an error to the upper layer is a good idea. All drivers are adapted accordingly. There is no intended change of behaviour, all callbacks were prepared to return 0 before. Reviewed-by: Peter Senna Tschudin <peter.senna@gmail.com> Reviewed-by: Jeremy Kerr <jk@codeconstruct.com.au> Reviewed-by: Benjamin Mugnier <benjamin.mugnier@foss.st.com> Reviewed-by: Javier Martinez Canillas <javierm@redhat.com> Reviewed-by: Crt Mori <cmo@melexis.com> Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Acked-by: Marek Behún <kabel@kernel.org> # for leds-turris-omnia Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Petr Machata <petrm@nvidia.com> # for mlxsw Reviewed-by: Maximilian Luz <luzmaximilian@gmail.com> # for surface3_power Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> # for bmc150-accel-i2c + kxcjk-1013 Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> # for media/* + staging/media/* Acked-by: Miguel Ojeda <ojeda@kernel.org> # for auxdisplay/ht16k33 + auxdisplay/lcd2s Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com> # for versaclock5 Reviewed-by: Ajay Gupta <ajayg@nvidia.com> # for ucsi_ccg Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> # for iio Acked-by: Peter Rosin <peda@axentia.se> # for i2c-mux-*, max9860 Acked-by: Adrien Grassein <adrien.grassein@gmail.com> # for lontium-lt8912b Reviewed-by: Jean Delvare <jdelvare@suse.de> # for hwmon, i2c-core and i2c/muxes Acked-by: Corey Minyard <cminyard@mvista.com> # for IPMI Reviewed-by: Vladimir Oltean <olteanv@gmail.com> Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Acked-by: Sebastian Reichel <sebastian.reichel@collabora.com> # for drivers/power Acked-by: Krzysztof Hałasa <khalasa@piap.pl> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2022-08-15 08:02:30 +00:00
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_new = 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");