Input: add driver for ADXL345/346 Digital Accelerometers (e27c7292) · Commits · e / devices / android_kernel_fairphone_FP4

drivers/input/misc/Kconfig

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		@@ -390,4 +390,41 @@ config INPUT_PCAP
		To compile this driver as a module, choose M here: the
		module will be called pcap_keys.

		config INPUT_ADXL34X
		tristate "Analog Devices ADXL34x Three-Axis Digital Accelerometer"
		default n
		help
		Say Y here if you have a Accelerometer interface using the
		ADXL345/6 controller, and your board-specific initialization
		code includes that in its table of devices.

		This driver can use either I2C or SPI communication to the
		ADXL345/6 controller. Select the appropriate method for
		your system.

		If unsure, say N (but it's safe to say "Y").

		To compile this driver as a module, choose M here: the
		module will be called adxl34x.

		config INPUT_ADXL34X_I2C
		tristate "support I2C bus connection"
		depends on INPUT_ADXL34X && I2C
		default y
		help
		Say Y here if you have ADXL345/6 hooked to an I2C bus.

		To compile this driver as a module, choose M here: the
		module will be called adxl34x-i2c.

		config INPUT_ADXL34X_SPI
		tristate "support SPI bus connection"
		depends on INPUT_ADXL34X && SPI
		default y
		help
		Say Y here if you have ADXL345/6 hooked to a SPI bus.

		To compile this driver as a module, choose M here: the
		module will be called adxl34x-spi.

		endif

drivers/input/misc/Makefile

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		@@ -8,6 +8,9 @@ obj-$(CONFIG_INPUT_88PM860X_ONKEY) += 88pm860x_onkey.o
		obj-$(CONFIG_INPUT_AD714X) += ad714x.o
		obj-$(CONFIG_INPUT_AD714X_I2C) += ad714x-i2c.o
		obj-$(CONFIG_INPUT_AD714X_SPI) += ad714x-spi.o
		obj-$(CONFIG_INPUT_ADXL34X) += adxl34x.o
		obj-$(CONFIG_INPUT_ADXL34X_I2C) += adxl34x-i2c.o
		obj-$(CONFIG_INPUT_ADXL34X_SPI) += adxl34x-spi.o
		obj-$(CONFIG_INPUT_APANEL) += apanel.o
		obj-$(CONFIG_INPUT_ATI_REMOTE) += ati_remote.o
		obj-$(CONFIG_INPUT_ATI_REMOTE2) += ati_remote2.o

drivers/input/misc/adxl34x-i2c.c

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		/*
		* ADLX345/346 Three-Axis Digital Accelerometers (I2C Interface)
		*
		* Enter bugs at http://blackfin.uclinux.org/
		*
		* Copyright (C) 2009 Michael Hennerich, Analog Devices Inc.
		* Licensed under the GPL-2 or later.
		*/

		#include <linux/input.h> /* BUS_I2C */
		#include <linux/i2c.h>
		#include <linux/module.h>
		#include <linux/types.h>
		#include "adxl34x.h"

		static int adxl34x_smbus_read(struct device *dev, unsigned char reg)
		{
		struct i2c_client *client = to_i2c_client(dev);

		return i2c_smbus_read_byte_data(client, reg);
		}

		static int adxl34x_smbus_write(struct device *dev,
		unsigned char reg, unsigned char val)
		{
		struct i2c_client *client = to_i2c_client(dev);

		return i2c_smbus_write_byte_data(client, reg, val);
		}

		static int adxl34x_smbus_read_block(struct device *dev,
		unsigned char reg, int count,
		void *buf)
		{
		struct i2c_client *client = to_i2c_client(dev);

		return i2c_smbus_read_i2c_block_data(client, reg, count, buf);
		}

		static int adxl34x_i2c_read_block(struct device *dev,
		unsigned char reg, int count,
		void *buf)
		{
		struct i2c_client *client = to_i2c_client(dev);
		int ret;

		ret = i2c_master_send(client, &reg, 1);
		if (ret < 0)
		return ret;

		ret = i2c_master_recv(client, buf, count);
		if (ret < 0)
		return ret;

		if (ret != count)
		return -EIO;

		return 0;
		}

		static const struct adxl34x_bus_ops adx134x_smbus_bops = {
		.bustype = BUS_I2C,
		.write = adxl34x_smbus_write,
		.read = adxl34x_smbus_read,
		.read_block = adxl34x_smbus_read_block,
		};

		static const struct adxl34x_bus_ops adx134x_i2c_bops = {
		.bustype = BUS_I2C,
		.write = adxl34x_smbus_write,
		.read = adxl34x_smbus_read,
		.read_block = adxl34x_i2c_read_block,
		};

		static int __devinit adxl34x_i2c_probe(struct i2c_client *client,
		const struct i2c_device_id *id)
		{
		struct adxl34x *ac;
		int error;

		error = i2c_check_functionality(client->adapter,
		I2C_FUNC_SMBUS_BYTE_DATA);
		if (!error) {
		dev_err(&client->dev, "SMBUS Byte Data not Supported\n");
		return -EIO;
		}

		ac = adxl34x_probe(&client->dev, client->irq, false,
		i2c_check_functionality(client->adapter,
		I2C_FUNC_SMBUS_READ_I2C_BLOCK) ?
		&adx134x_smbus_bops : &adx134x_i2c_bops);
		if (IS_ERR(ac))
		return PTR_ERR(ac);

		i2c_set_clientdata(client, ac);

		return 0;
		}

		static int __devexit adxl34x_i2c_remove(struct i2c_client *client)
		{
		struct adxl34x *ac = i2c_get_clientdata(client);

		return adxl34x_remove(ac);
		}

		#ifdef CONFIG_PM
		static int adxl34x_suspend(struct i2c_client *client, pm_message_t message)
		{
		struct adxl34x *ac = i2c_get_clientdata(client);

		adxl34x_disable(ac);

		return 0;
		}

		static int adxl34x_resume(struct i2c_client *client)
		{
		struct adxl34x *ac = i2c_get_clientdata(client);

		adxl34x_enable(ac);

		return 0;
		}
		#else
		# define adxl34x_suspend NULL
		# define adxl34x_resume NULL
		#endif

		static const struct i2c_device_id adxl34x_id[] = {
		{ "adxl34x", 0 },
		{ }
		};

		MODULE_DEVICE_TABLE(i2c, adxl34x_id);

		static struct i2c_driver adxl34x_driver = {
		.driver = {
		.name = "adxl34x",
		.owner = THIS_MODULE,
		},
		.probe = adxl34x_i2c_probe,
		.remove = __devexit_p(adxl34x_i2c_remove),
		.suspend = adxl34x_suspend,
		.resume = adxl34x_resume,
		.id_table = adxl34x_id,
		};

		static int __init adxl34x_i2c_init(void)
		{
		return i2c_add_driver(&adxl34x_driver);
		}
		module_init(adxl34x_i2c_init);

		static void __exit adxl34x_i2c_exit(void)
		{
		i2c_del_driver(&adxl34x_driver);
		}
		module_exit(adxl34x_i2c_exit);

		MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
		MODULE_DESCRIPTION("ADXL345/346 Three-Axis Digital Accelerometer I2C Bus Driver");
		MODULE_LICENSE("GPL");

drivers/input/misc/adxl34x-spi.c

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		/*
		* ADLX345/346 Three-Axis Digital Accelerometers (SPI Interface)
		*
		* Enter bugs at http://blackfin.uclinux.org/
		*
		* Copyright (C) 2009 Michael Hennerich, Analog Devices Inc.
		* Licensed under the GPL-2 or later.
		*/

		#include <linux/input.h> /* BUS_SPI */
		#include <linux/module.h>
		#include <linux/spi/spi.h>
		#include <linux/types.h>
		#include "adxl34x.h"

		#define MAX_SPI_FREQ_HZ 5000000
		#define MAX_FREQ_NO_FIFODELAY 1500000
		#define ADXL34X_CMD_MULTB (1 << 6)
		#define ADXL34X_CMD_READ (1 << 7)
		#define ADXL34X_WRITECMD(reg) (reg & 0x3F)
		#define ADXL34X_READCMD(reg) (ADXL34X_CMD_READ \| (reg & 0x3F))
		#define ADXL34X_READMB_CMD(reg) (ADXL34X_CMD_READ \| ADXL34X_CMD_MULTB \
		\| (reg & 0x3F))

		static int adxl34x_spi_read(struct device *dev, unsigned char reg)
		{
		struct spi_device *spi = to_spi_device(dev);
		unsigned char cmd;

		cmd = ADXL34X_READCMD(reg);

		return spi_w8r8(spi, cmd);
		}

		static int adxl34x_spi_write(struct device *dev,
		unsigned char reg, unsigned char val)
		{
		struct spi_device *spi = to_spi_device(dev);
		unsigned char buf[2];

		buf[0] = ADXL34X_WRITECMD(reg);
		buf[1] = val;

		return spi_write(spi, buf, sizeof(buf));
		}

		static int adxl34x_spi_read_block(struct device *dev,
		unsigned char reg, int count,
		void *buf)
		{
		struct spi_device *spi = to_spi_device(dev);
		ssize_t status;

		reg = ADXL34X_READMB_CMD(reg);
		status = spi_write_then_read(spi, &reg, 1, buf, count);

		return (status < 0) ? status : 0;
		}

		static const struct adxl34x_bus_ops adx134x_spi_bops = {
		.bustype = BUS_SPI,
		.write = adxl34x_spi_write,
		.read = adxl34x_spi_read,
		.read_block = adxl34x_spi_read_block,
		};

		static int __devinit adxl34x_spi_probe(struct spi_device *spi)
		{
		struct adxl34x *ac;

		/* don't exceed max specified SPI CLK frequency */
		if (spi->max_speed_hz > MAX_SPI_FREQ_HZ) {
		dev_err(&spi->dev, "SPI CLK %d Hz too fast\n", spi->max_speed_hz);
		return -EINVAL;
		}

		ac = adxl34x_probe(&spi->dev, spi->irq,
		spi->max_speed_hz > MAX_FREQ_NO_FIFODELAY,
		&adx134x_spi_bops);

		if (IS_ERR(ac))
		return PTR_ERR(ac);

		spi_set_drvdata(spi, ac);

		return 0;
		}

		static int __devexit adxl34x_spi_remove(struct spi_device *spi)
		{
		struct adxl34x *ac = dev_get_drvdata(&spi->dev);

		return adxl34x_remove(ac);
		}

		#ifdef CONFIG_PM
		static int adxl34x_suspend(struct spi_device *spi, pm_message_t message)
		{
		struct adxl34x *ac = dev_get_drvdata(&spi->dev);

		adxl34x_disable(ac);

		return 0;
		}

		static int adxl34x_resume(struct spi_device *spi)
		{
		struct adxl34x *ac = dev_get_drvdata(&spi->dev);

		adxl34x_enable(ac);

		return 0;
		}
		#else
		# define adxl34x_suspend NULL
		# define adxl34x_resume NULL
		#endif

		static struct spi_driver adxl34x_driver = {
		.driver = {
		.name = "adxl34x",
		.bus = &spi_bus_type,
		.owner = THIS_MODULE,
		},
		.probe = adxl34x_spi_probe,
		.remove = __devexit_p(adxl34x_spi_remove),
		.suspend = adxl34x_suspend,
		.resume = adxl34x_resume,
		};

		static int __init adxl34x_spi_init(void)
		{
		return spi_register_driver(&adxl34x_driver);
		}
		module_init(adxl34x_spi_init);

		static void __exit adxl34x_spi_exit(void)
		{
		spi_unregister_driver(&adxl34x_driver);
		}
		module_exit(adxl34x_spi_exit);

		MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
		MODULE_DESCRIPTION("ADXL345/346 Three-Axis Digital Accelerometer SPI Bus Driver");
		MODULE_LICENSE("GPL");

drivers/input/misc/adxl34x.c

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