[linux-2.6-block.git] / drivers / base / regmap / regmap-spmi.c

/*
 * Register map access API - SPMI support
 *
 * Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
 *
 * Based on regmap-i2c.c:
 * 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 and
 * only version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */
#include <linux/regmap.h>
#include <linux/spmi.h>
#include <linux/module.h>
#include <linux/init.h>

static int regmap_spmi_base_read(void *context,
				 const void *reg, size_t reg_size,
				 void *val, size_t val_size)
{
	u8 addr = *(u8 *)reg;
	int err = 0;

	BUG_ON(reg_size != 1);

	while (val_size-- && !err)
		err = spmi_register_read(context, addr++, val++);

	return err;
}

static int regmap_spmi_base_gather_write(void *context,
					 const void *reg, size_t reg_size,
					 const void *val, size_t val_size)
{
	const u8 *data = val;
	u8 addr = *(u8 *)reg;
	int err = 0;

	BUG_ON(reg_size != 1);

	/*
	 * SPMI defines a more bandwidth-efficient 'Register 0 Write' sequence,
	 * use it when possible.
	 */
	if (addr == 0 && val_size) {
		err = spmi_register_zero_write(context, *data);
		if (err)
			goto err_out;

		data++;
		addr++;
		val_size--;
	}

	while (val_size) {
		err = spmi_register_write(context, addr, *data);
		if (err)
			goto err_out;

		data++;
		addr++;
		val_size--;
	}

err_out:
	return err;
}

static int regmap_spmi_base_write(void *context, const void *data,
				  size_t count)
{
	BUG_ON(count < 1);
	return regmap_spmi_base_gather_write(context, data, 1, data + 1,
					     count - 1);
}

static struct regmap_bus regmap_spmi_base = {
	.read				= regmap_spmi_base_read,
	.write				= regmap_spmi_base_write,
	.gather_write			= regmap_spmi_base_gather_write,
	.reg_format_endian_default	= REGMAP_ENDIAN_NATIVE,
	.val_format_endian_default	= REGMAP_ENDIAN_NATIVE,
};

/**
 * regmap_init_spmi_base(): Create regmap for the Base register space
 * @sdev:	SPMI 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_spmi_base(struct spmi_device *sdev,
				     const struct regmap_config *config)
{
	return regmap_init(&sdev->dev, &regmap_spmi_base, sdev, config);
}
EXPORT_SYMBOL_GPL(regmap_init_spmi_base);

/**
 * devm_regmap_init_spmi_base(): Create managed regmap for Base register space
 * @sdev:	SPMI 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.  The regmap will be automatically freed by the
 * device management code.
 */
struct regmap *devm_regmap_init_spmi_base(struct spmi_device *sdev,
					  const struct regmap_config *config)
{
	return devm_regmap_init(&sdev->dev, &regmap_spmi_base, sdev, config);
}
EXPORT_SYMBOL_GPL(devm_regmap_init_spmi_base);

static int regmap_spmi_ext_read(void *context,
				const void *reg, size_t reg_size,
				void *val, size_t val_size)
{
	int err = 0;
	size_t len;
	u16 addr;

	BUG_ON(reg_size != 2);

	addr = *(u16 *)reg;

	/*
	 * Split accesses into two to take advantage of the more
	 * bandwidth-efficient 'Extended Register Read' command when possible
	 */
	while (addr <= 0xFF && val_size) {
		len = min_t(size_t, val_size, 16);

		err = spmi_ext_register_read(context, addr, val, len);
		if (err)
			goto err_out;

		addr += len;
		val += len;
		val_size -= len;
	}

	while (val_size) {
		len = min_t(size_t, val_size, 8);

		err = spmi_ext_register_readl(context, addr, val, val_size);
		if (err)
			goto err_out;

		addr += len;
		val += len;
		val_size -= len;
	}

err_out:
	return err;
}

static int regmap_spmi_ext_gather_write(void *context,
					const void *reg, size_t reg_size,
					const void *val, size_t val_size)
{
	int err = 0;
	size_t len;
	u16 addr;

	BUG_ON(reg_size != 2);

	addr = *(u16 *)reg;

	while (addr <= 0xFF && val_size) {
		len = min_t(size_t, val_size, 16);

		err = spmi_ext_register_write(context, addr, val, len);
		if (err)
			goto err_out;

		addr += len;
		val += len;
		val_size -= len;
	}

	while (val_size) {
		len = min_t(size_t, val_size, 8);

		err = spmi_ext_register_writel(context, addr, val, len);
		if (err)
			goto err_out;

		addr += len;
		val += len;
		val_size -= len;
	}

err_out:
	return err;
}

static int regmap_spmi_ext_write(void *context, const void *data,
				 size_t count)
{
	BUG_ON(count < 2);
	return regmap_spmi_ext_gather_write(context, data, 2, data + 2,
					    count - 2);
}

static struct regmap_bus regmap_spmi_ext = {
	.read				= regmap_spmi_ext_read,
	.write				= regmap_spmi_ext_write,
	.gather_write			= regmap_spmi_ext_gather_write,
	.reg_format_endian_default	= REGMAP_ENDIAN_NATIVE,
	.val_format_endian_default	= REGMAP_ENDIAN_NATIVE,
};

/**
 * regmap_init_spmi_ext(): Create regmap for Ext register space
 * @sdev:	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_spmi_ext(struct spmi_device *sdev,
				    const struct regmap_config *config)
{
	return regmap_init(&sdev->dev, &regmap_spmi_ext, sdev, config);
}
EXPORT_SYMBOL_GPL(regmap_init_spmi_ext);

/**
 * devm_regmap_init_spmi_ext(): Create managed regmap for Ext register space
 * @sdev:	SPMI 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.  The regmap will be automatically freed by the
 * device management code.
 */
struct regmap *devm_regmap_init_spmi_ext(struct spmi_device *sdev,
				     const struct regmap_config *config)
{
	return devm_regmap_init(&sdev->dev, &regmap_spmi_ext, sdev, config);
}
EXPORT_SYMBOL_GPL(devm_regmap_init_spmi_ext);

MODULE_LICENSE("GPL");
Commit	Line	Data
a01779f8 JC	1	/*
	2	* Register map access API - SPMI support
	3	*
	4	* Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
	5	*
	6	* Based on regmap-i2c.c:
	7	* Copyright 2011 Wolfson Microelectronics plc
	8	* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License version 2 and
	12	* only version 2 as published by the Free Software Foundation.
	13	*
	14	* This program is distributed in the hope that it will be useful,
	15	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	17	* GNU General Public License for more details.
	18	*
	19	*/
	20	#include <linux/regmap.h>
	21	#include <linux/spmi.h>
	22	#include <linux/module.h>
	23	#include <linux/init.h>
	24
c9afbb05 JC	25	static int regmap_spmi_base_read(void *context,
	26	const void *reg, size_t reg_size,
	27	void *val, size_t val_size)
a01779f8	28	{
c9afbb05 JC	29	u8 addr = (u8 )reg;
	30	int err = 0;
	31
	32	BUG_ON(reg_size != 1);
	33
	34	while (val_size-- && !err)
	35	err = spmi_register_read(context, addr++, val++);
	36
	37	return err;
	38	}
	39
	40	static int regmap_spmi_base_gather_write(void *context,
	41	const void *reg, size_t reg_size,
	42	const void *val, size_t val_size)
	43	{
	44	const u8 *data = val;
	45	u8 addr = (u8 )reg;
	46	int err = 0;
	47
	48	BUG_ON(reg_size != 1);
	49
	50	/*
	51	* SPMI defines a more bandwidth-efficient 'Register 0 Write' sequence,
	52	* use it when possible.
	53	*/
	54	if (addr == 0 && val_size) {
	55	err = spmi_register_zero_write(context, *data);
	56	if (err)
	57	goto err_out;
	58
	59	data++;
	60	addr++;
	61	val_size--;
	62	}
	63
	64	while (val_size) {
	65	err = spmi_register_write(context, addr, *data);
	66	if (err)
	67	goto err_out;
	68
	69	data++;
	70	addr++;
	71	val_size--;
	72	}
	73
	74	err_out:
	75	return err;
	76	}
	77
	78	static int regmap_spmi_base_write(void context, const void data,
	79	size_t count)
	80	{
	81	BUG_ON(count < 1);
	82	return regmap_spmi_base_gather_write(context, data, 1, data + 1,
	83	count - 1);
	84	}
	85
	86	static struct regmap_bus regmap_spmi_base = {
	87	.read = regmap_spmi_base_read,
	88	.write = regmap_spmi_base_write,
	89	.gather_write = regmap_spmi_base_gather_write,
	90	.reg_format_endian_default = REGMAP_ENDIAN_NATIVE,
	91	.val_format_endian_default = REGMAP_ENDIAN_NATIVE,
	92	};
93
94	/**
95	* regmap_init_spmi_base(): Create regmap for the Base register space
96	* @sdev: SPMI device that will be interacted with
97	* @config: Configuration for register map
98	*
99	* The return value will be an ERR_PTR() on error or a valid pointer to
100	* a struct regmap.
101	*/
102	struct regmap regmap_init_spmi_base(struct spmi_device sdev,
103	const struct regmap_config *config)
104	{
105	return regmap_init(&sdev->dev, &regmap_spmi_base, sdev, config);
106	}
107	EXPORT_SYMBOL_GPL(regmap_init_spmi_base);
108
109	/**
110	* devm_regmap_init_spmi_base(): Create managed regmap for Base register space
111	* @sdev: SPMI device that will be interacted with
112	* @config: Configuration for register map
113	*
114	* The return value will be an ERR_PTR() on error or a valid pointer
115	* to a struct regmap. The regmap will be automatically freed by the
116	* device management code.
117	*/
118	struct regmap devm_regmap_init_spmi_base(struct spmi_device sdev,
119	const struct regmap_config *config)
120	{
121	return devm_regmap_init(&sdev->dev, &regmap_spmi_base, sdev, config);
122	}
123	EXPORT_SYMBOL_GPL(devm_regmap_init_spmi_base);
124
125	static int regmap_spmi_ext_read(void *context,
126	const void *reg, size_t reg_size,
127	void *val, size_t val_size)
128	{
129	int err = 0;
130	size_t len;
131	u16 addr;
132
a01779f8	133	BUG_ON(reg_size != 2);
c9afbb05 JC	134
	135	addr = (u16 )reg;
	136
	137	/*
	138	* Split accesses into two to take advantage of the more
	139	* bandwidth-efficient 'Extended Register Read' command when possible
	140	*/
	141	while (addr <= 0xFF && val_size) {
	142	len = min_t(size_t, val_size, 16);
	143
	144	err = spmi_ext_register_read(context, addr, val, len);
	145	if (err)
	146	goto err_out;
	147
	148	addr += len;
	149	val += len;
	150	val_size -= len;
	151	}
	152
	153	while (val_size) {
	154	len = min_t(size_t, val_size, 8);
	155
	156	err = spmi_ext_register_readl(context, addr, val, val_size);
	157	if (err)
	158	goto err_out;
	159
	160	addr += len;
	161	val += len;
	162	val_size -= len;
	163	}
	164
	165	err_out:
	166	return err;
a01779f8 JC	167	}
a01779f8 JC	168
c9afbb05 JC	169	static int regmap_spmi_ext_gather_write(void *context,
	170	const void *reg, size_t reg_size,
	171	const void *val, size_t val_size)
a01779f8	172	{
c9afbb05 JC	173	int err = 0;
	174	size_t len;
	175	u16 addr;
	176
a01779f8	177	BUG_ON(reg_size != 2);
c9afbb05 JC	178
	179	addr = (u16 )reg;
	180
	181	while (addr <= 0xFF && val_size) {
	182	len = min_t(size_t, val_size, 16);
	183
	184	err = spmi_ext_register_write(context, addr, val, len);
	185	if (err)
	186	goto err_out;
	187
	188	addr += len;
	189	val += len;
	190	val_size -= len;
	191	}
	192
	193	while (val_size) {
	194	len = min_t(size_t, val_size, 8);
	195
	196	err = spmi_ext_register_writel(context, addr, val, len);
	197	if (err)
	198	goto err_out;
	199
	200	addr += len;
	201	val += len;
	202	val_size -= len;
	203	}
	204
	205	err_out:
	206	return err;
a01779f8 JC	207	}
a01779f8 JC	208
c9afbb05 JC	209	static int regmap_spmi_ext_write(void context, const void data,
c9afbb05 JC	210	size_t count)
a01779f8 JC	211	{
a01779f8 JC	212	BUG_ON(count < 2);
c9afbb05 JC	213	return regmap_spmi_ext_gather_write(context, data, 2, data + 2,
c9afbb05 JC	214	count - 2);
a01779f8 JC	215	}
a01779f8 JC	216
c9afbb05 JC	217	static struct regmap_bus regmap_spmi_ext = {
	218	.read = regmap_spmi_ext_read,
	219	.write = regmap_spmi_ext_write,
	220	.gather_write = regmap_spmi_ext_gather_write,
a01779f8 JC	221	.reg_format_endian_default = REGMAP_ENDIAN_NATIVE,
	222	.val_format_endian_default = REGMAP_ENDIAN_NATIVE,
	223	};
	224
	225	/**
c9afbb05 JC	226	* regmap_init_spmi_ext(): Create regmap for Ext register space
	227	* @sdev: Device that will be interacted with
	228	* @config: Configuration for register map
a01779f8 JC	229	*
	230	* The return value will be an ERR_PTR() on error or a valid pointer to
	231	* a struct regmap.
	232	*/
c9afbb05 JC	233	struct regmap regmap_init_spmi_ext(struct spmi_device sdev,
c9afbb05 JC	234	const struct regmap_config *config)
a01779f8	235	{
c9afbb05	236	return regmap_init(&sdev->dev, &regmap_spmi_ext, sdev, config);
a01779f8	237	}
c9afbb05	238	EXPORT_SYMBOL_GPL(regmap_init_spmi_ext);
a01779f8 JC	239
a01779f8 JC	240	/**
c9afbb05 JC	241	* devm_regmap_init_spmi_ext(): Create managed regmap for Ext register space
	242	* @sdev: SPMI device that will be interacted with
	243	* @config: Configuration for register map
a01779f8 JC	244	*
	245	* The return value will be an ERR_PTR() on error or a valid pointer
	246	* to a struct regmap. The regmap will be automatically freed by the
	247	* device management code.
	248	*/
c9afbb05	249	struct regmap devm_regmap_init_spmi_ext(struct spmi_device sdev,
a01779f8 JC	250	const struct regmap_config *config)
a01779f8 JC	251	{
c9afbb05	252	return devm_regmap_init(&sdev->dev, &regmap_spmi_ext, sdev, config);
a01779f8	253	}
c9afbb05	254	EXPORT_SYMBOL_GPL(devm_regmap_init_spmi_ext);
a01779f8 JC	255
a01779f8 JC	256	MODULE_LICENSE("GPL");