Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 9943fa30 authored by Mark Brown's avatar Mark Brown
Browse files

regmap: Add I2C bus support 



Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: default avatarLiam Girdwood <lrg@ti.com>
Acked-by: default avatarWolfram Sang <w.sang@pengutronix.de>
Acked-by: default avatarGrant Likely <grant.likely@secretlab.ca>
parent b83a313b

drivers/base/regmap/Kconfig

+4 −0
Original line number Diff line number Diff line
@@ -3,4 +3,8 @@ 
# subsystems should select the appropriate symbols.



config REGMAP

	default y if REGMAP_I2C

	bool



config REGMAP_I2C

	tristate

drivers/base/regmap/Makefile

+1 −0
Original line number Diff line number Diff line 
obj-$(CONFIG_REGMAP) += regmap.o

obj-$(CONFIG_REGMAP_I2C) += regmap-i2c.o

drivers/base/regmap/regmap-i2c.c

0 → 100644
+115 −0
Original line number Diff line number Diff line 
/*

 * Register map access API - I2C support

 *

 * Copyright 2011 Wolfson Microelectronics plc

 *

 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 */



#include <linux/regmap.h>

#include <linux/i2c.h>

#include <linux/module.h>

#include <linux/init.h>



static int regmap_i2c_write(struct device *dev, const void *data, size_t count)

{

	struct i2c_client *i2c = to_i2c_client(dev);

	int ret;



	ret = i2c_master_send(i2c, data, count);

	if (ret == count)

		return 0;

	else if (ret < 0)

		return ret;

	else

		return -EIO;

}



static int regmap_i2c_gather_write(struct device *dev,

				   const void *reg, size_t reg_size,

				   const void *val, size_t val_size)

{

	struct i2c_client *i2c = to_i2c_client(dev);

	struct i2c_msg xfer[2];

	int ret;



	/* If the I2C controller can't do a gather tell the core, it

	 * will substitute in a linear write for us.

	 */

	if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_PROTOCOL_MANGLING))

		return -ENOTSUPP;



	xfer[0].addr = i2c->addr;

	xfer[0].flags = 0;

	xfer[0].len = reg_size;

	xfer[0].buf = (void *)reg;



	xfer[1].addr = i2c->addr;

	xfer[1].flags = I2C_M_NOSTART;

	xfer[1].len = val_size;

	xfer[1].buf = (void *)val;



	ret = i2c_transfer(i2c->adapter, xfer, 2);

	if (ret == 2)

		return 0;

	if (ret < 0)

		return ret;

	else

		return -EIO;

}



static int regmap_i2c_read(struct device *dev,

			   const void *reg, size_t reg_size,

			   void *val, size_t val_size)

{

	struct i2c_client *i2c = to_i2c_client(dev);

	struct i2c_msg xfer[2];

	int ret;



	xfer[0].addr = i2c->addr;

	xfer[0].flags = 0;

	xfer[0].len = reg_size;

	xfer[0].buf = (void *)reg;



	xfer[1].addr = i2c->addr;

	xfer[1].flags = I2C_M_RD;

	xfer[1].len = val_size;

	xfer[1].buf = val;



	ret = i2c_transfer(i2c->adapter, xfer, 2);

	if (ret == 2)

		return 0;

	else if (ret < 0)

		return ret;

	else

		return -EIO;

}



static struct regmap_bus regmap_i2c = {

	.type = &i2c_bus_type,

	.write = regmap_i2c_write,

	.gather_write = regmap_i2c_gather_write,

	.read = regmap_i2c_read,

	.owner = THIS_MODULE,

};



/**

 * regmap_init_i2c(): Initialise register map

 *

 * @i2c: Device that will be interacted with

 * @config: Configuration for register map

 *

 * The return value will be an ERR_PTR() on error or a valid pointer to

 * a struct regmap.

 */

struct regmap *regmap_init_i2c(struct i2c_client *i2c,

			       const struct regmap_config *config)

{

	return regmap_init(&i2c->dev, &regmap_i2c, config);

}

EXPORT_SYMBOL_GPL(regmap_init_i2c);

include/linux/regmap.h

+4 −0
Original line number Diff line number Diff line
@@ -17,6 +17,8 @@ 
#include <linux/list.h>

#include <linux/module.h>



struct i2c_client;



struct regmap_config {

	int reg_bits;

	int val_bits;
@@ -59,6 +61,8 @@ struct regmap_bus { 
struct regmap *regmap_init(struct device *dev,

			   const struct regmap_bus *bus,

			   const struct regmap_config *config);

struct regmap *regmap_init_i2c(struct i2c_client *i2c,

			       const struct regmap_config *config);

void regmap_exit(struct regmap *map);

int regmap_write(struct regmap *map, unsigned int reg, unsigned int val);

int regmap_raw_write(struct regmap *map, unsigned int reg,