mfd: Add a core driver for TI TPS61050/TPS61052 chips v2 (798a8eee) · Commits · e / devices / android_kernel_xiaomi_markw

drivers/mfd/Kconfig

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		@@ -129,6 +129,15 @@ config UCB1400_CORE
		To compile this driver as a module, choose M here: the
		module will be called ucb1400_core.

		config TPS6105X
		tristate "TPS61050/61052 Boost Converters"
		depends on I2C
		help
		This option enables a driver for the TP61050/TPS61052
		high-power "white LED driver". This boost converter is
		sometimes used for other things than white LEDs, and
		also contains a GPIO pin.

		config TPS65010
		tristate "TPS6501x Power Management chips"
		depends on I2C && GPIOLIB

drivers/mfd/Makefile

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		@@ -33,6 +33,7 @@ obj-$(CONFIG_MFD_WM8350) += wm8350.o
		obj-$(CONFIG_MFD_WM8350_I2C) += wm8350-i2c.o
		obj-$(CONFIG_MFD_WM8994) += wm8994-core.o wm8994-irq.o

		obj-$(CONFIG_TPS6105X) += tps6105x.o
		obj-$(CONFIG_TPS65010) += tps65010.o
		obj-$(CONFIG_TPS6507X) += tps6507x.o
		obj-$(CONFIG_MENELAUS) += menelaus.o

drivers/mfd/tps6105x.c

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		/*
		* 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>
		*
		* License terms: GNU General Public License (GPL) version 2
		*/

		#include <linux/module.h>
		#include <linux/init.h>
		#include <linux/i2c.h>
		#include <linux/mutex.h>
		#include <linux/gpio.h>
		#include <linux/spinlock.h>
		#include <linux/slab.h>
		#include <linux/err.h>
		#include <linux/regulator/driver.h>
		#include <linux/mfd/core.h>
		#include <linux/mfd/tps6105x.h>

		int tps6105x_set(struct tps6105x *tps6105x, u8 reg, u8 value)
		{
		int ret;

		ret = mutex_lock_interruptible(&tps6105x->lock);
		if (ret)
		return ret;
		ret = i2c_smbus_write_byte_data(tps6105x->client, reg, value);
		mutex_unlock(&tps6105x->lock);
		if (ret < 0)
		return ret;

		return 0;
		}
		EXPORT_SYMBOL(tps6105x_set);

		int tps6105x_get(struct tps6105x tps6105x, u8 reg, u8 buf)
		{
		int ret;

		ret = mutex_lock_interruptible(&tps6105x->lock);
		if (ret)
		return ret;
		ret = i2c_smbus_read_byte_data(tps6105x->client, reg);
		mutex_unlock(&tps6105x->lock);
		if (ret < 0)
		return ret;

		*buf = ret;
		return 0;
		}
		EXPORT_SYMBOL(tps6105x_get);

		/*
		* Masks off the bits in the mask and sets the bits in the bitvalues
		* parameter in one atomic operation
		*/
		int tps6105x_mask_and_set(struct tps6105x *tps6105x, u8 reg,
		u8 bitmask, u8 bitvalues)
		{
		int ret;
		u8 regval;

		ret = mutex_lock_interruptible(&tps6105x->lock);
		if (ret)
		return ret;
		ret = i2c_smbus_read_byte_data(tps6105x->client, reg);
		if (ret < 0)
		goto fail;
		regval = ret;
		regval = (~bitmask & regval) \| (bitmask & bitvalues);
		ret = i2c_smbus_write_byte_data(tps6105x->client, reg, regval);
		fail:
		mutex_unlock(&tps6105x->lock);
		if (ret < 0)
		return ret;

		return 0;
		}
		EXPORT_SYMBOL(tps6105x_mask_and_set);

		static int __devinit tps6105x_startup(struct tps6105x *tps6105x)
		{
		int ret;
		u8 regval;

		ret = tps6105x_get(tps6105x, 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 have one cell which is selected operation
		* mode, and we always have a GPIO cell.
		*/
		static struct mfd_cell tps6105x_cells[] = {
		{
		/* name will be runtime assigned */
		.id = -1,
		},
		{
		.name = "tps6105x-gpio",
		.id = -1,
		},
		};

		static int __devinit tps6105x_probe(struct i2c_client *client,
		const struct i2c_device_id *id)
		{
		struct tps6105x *tps6105x;
		struct tps6105x_platform_data *pdata;
		int ret;
		int i;

		tps6105x = kmalloc(sizeof(*tps6105x), GFP_KERNEL);
		if (!tps6105x)
		return -ENOMEM;

		i2c_set_clientdata(client, tps6105x);
		tps6105x->client = client;
		pdata = client->dev.platform_data;
		tps6105x->pdata = pdata;
		mutex_init(&tps6105x->lock);

		ret = tps6105x_startup(tps6105x);
		if (ret) {
		dev_err(&client->dev, "chip initialization failed\n");
		goto fail;
		}

		/* Remove warning texts when you implement new cell drivers */
		switch (pdata->mode) {
		case TPS6105X_MODE_SHUTDOWN:
		dev_info(&client->dev,
		"present, not used for anything, only GPIO\n");
		break;
		case TPS6105X_MODE_TORCH:
		tps6105x_cells[0].name = "tps6105x-leds";
		dev_warn(&client->dev,
		"torch mode is unsupported\n");
		break;
		case TPS6105X_MODE_TORCH_FLASH:
		tps6105x_cells[0].name = "tps6105x-flash";
		dev_warn(&client->dev,
		"flash mode is unsupported\n");
		break;
		case TPS6105X_MODE_VOLTAGE:
		tps6105x_cells[0].name ="tps6105x-regulator";
		break;
		default:
		break;
		}

		/* Set up and register the platform devices. */
		for (i = 0; i < ARRAY_SIZE(tps6105x_cells); i++) {
		/* One state holder for all drivers, this is simple */
		tps6105x_cells[i].mfd_data = tps6105x;
		}

		ret = mfd_add_devices(&client->dev, 0, tps6105x_cells,
		ARRAY_SIZE(tps6105x_cells), NULL, 0);
		if (ret)
		goto fail;

		return 0;

		fail:
		kfree(tps6105x);
		return ret;
		}

		static int __devexit tps6105x_remove(struct i2c_client *client)
		{
		struct tps6105x *tps6105x = i2c_get_clientdata(client);

		mfd_remove_devices(&client->dev);

		/* Put chip in shutdown mode */
		tps6105x_mask_and_set(tps6105x, TPS6105X_REG_0,
		TPS6105X_REG0_MODE_MASK,
		TPS6105X_MODE_SHUTDOWN << TPS6105X_REG0_MODE_SHIFT);

		kfree(tps6105x);
		return 0;
		}

		static const struct i2c_device_id tps6105x_id[] = {
		{ "tps61050", 0 },
		{ "tps61052", 0 },
		{ }
		};
		MODULE_DEVICE_TABLE(i2c, tps6105x_id);

		static struct i2c_driver tps6105x_driver = {
		.driver = {
		.name = "tps6105x",
		},
		.probe = tps6105x_probe,
		.remove = __devexit_p(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");

include/linux/mfd/tps6105x.h

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		/*
		* Copyright (C) 2011 ST-Ericsson SA
		* Written on behalf of Linaro for ST-Ericsson
		*
		* Author: Linus Walleij <linus.walleij@linaro.org>
		*
		* License terms: GNU General Public License (GPL) version 2
		*/
		#ifndef MFD_TPS6105X_H
		#define MFD_TPS6105X_H

		#include <linux/i2c.h>

		/*
		* Register definitions to all subdrivers
		*/
		#define TPS6105X_REG_0 0x00
		#define TPS6105X_REG0_MODE_SHIFT 6
		#define TPS6105X_REG0_MODE_MASK (0x03<<6)
		/* These defines for both reg0 and reg1 */
		#define TPS6105X_REG0_MODE_SHUTDOWN 0x00
		#define TPS6105X_REG0_MODE_TORCH 0x01
		#define TPS6105X_REG0_MODE_TORCH_FLASH 0x02
		#define TPS6105X_REG0_MODE_VOLTAGE 0x03
		#define TPS6105X_REG0_VOLTAGE_SHIFT 4
		#define TPS6105X_REG0_VOLTAGE_MASK (3<<4)
		#define TPS6105X_REG0_VOLTAGE_450 0
		#define TPS6105X_REG0_VOLTAGE_500 1
		#define TPS6105X_REG0_VOLTAGE_525 2
		#define TPS6105X_REG0_VOLTAGE_500_2 3
		#define TPS6105X_REG0_DIMMING_SHIFT 3
		#define TPS6105X_REG0_TORCHC_SHIFT 0
		#define TPS6105X_REG0_TORCHC_MASK (7<<0)
		#define TPS6105X_REG0_TORCHC_0 0x00
		#define TPS6105X_REG0_TORCHC_50 0x01
		#define TPS6105X_REG0_TORCHC_75 0x02
		#define TPS6105X_REG0_TORCHC_100 0x03
		#define TPS6105X_REG0_TORCHC_150 0x04
		#define TPS6105X_REG0_TORCHC_200 0x05
		#define TPS6105X_REG0_TORCHC_250_400 0x06
		#define TPS6105X_REG0_TORCHC_250_500 0x07
		#define TPS6105X_REG_1 0x01
		#define TPS6105X_REG1_MODE_SHIFT 6
		#define TPS6105X_REG1_MODE_MASK (0x03<<6)
		#define TPS6105X_REG1_MODE_SHUTDOWN 0x00
		#define TPS6105X_REG1_MODE_TORCH 0x01
		#define TPS6105X_REG1_MODE_TORCH_FLASH 0x02
		#define TPS6105X_REG1_MODE_VOLTAGE 0x03
		#define TPS6105X_REG_2 0x02
		#define TPS6105X_REG_3 0x03

		/**
		* enum tps6105x_mode - desired mode for the TPS6105x
		* @TPS6105X_MODE_SHUTDOWN: this instance is inactive, not used for anything
		* @TPS61905X_MODE_TORCH: this instance is used as a LED, usually a while
		* LED, for example as backlight or flashlight. If this is set, the
		* TPS6105X will register to the LED framework
		* @TPS6105X_MODE_TORCH_FLASH: this instance is used as a flashgun, usually
		* in a camera
		* @TPS6105X_MODE_VOLTAGE: this instance is used as a voltage regulator and
		* will register to the regulator framework
		*/
		enum tps6105x_mode {
		TPS6105X_MODE_SHUTDOWN,
		TPS6105X_MODE_TORCH,
		TPS6105X_MODE_TORCH_FLASH,
		TPS6105X_MODE_VOLTAGE,
		};

		/**
		* struct tps6105x_platform_data - TPS61905x platform data
		* @mode: what mode this instance shall be operated in,
		* this is not selectable at runtime
		*/
		struct tps6105x_platform_data {
		enum tps6105x_mode mode;
		};

		/**
		* struct tps6105x - state holder for the TPS6105x drivers
		* @mutex: mutex to serialize I2C accesses
		* @i2c_client: corresponding I2C client
		*/
		struct tps6105x {
		struct tps6105x_platform_data *pdata;
		struct mutex lock;
		struct i2c_client *client;
		};

		extern int tps6105x_set(struct tps6105x *tps6105x, u8 reg, u8 value);
		extern int tps6105x_get(struct tps6105x tps6105x, u8 reg, u8 buf);
		extern int tps6105x_mask_and_set(struct tps6105x *tps6105x, u8 reg,
		u8 bitmask, u8 bitvalues);

		#endif