[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,
};

struct regmap *__regmap_init_spmi_base(struct spmi_device *sdev,
				       const struct regmap_config *config,
				       struct lock_class_key *lock_key,
				       const char *lock_name)
{
	return __regmap_init(&sdev->dev, &regmap_spmi_base, sdev, config,
			     lock_key, lock_name);
}
EXPORT_SYMBOL_GPL(__regmap_init_spmi_base);

struct regmap *__devm_regmap_init_spmi_base(struct spmi_device *sdev,
					    const struct regmap_config *config,
					    struct lock_class_key *lock_key,
					    const char *lock_name)
{
	return __devm_regmap_init(&sdev->dev, &regmap_spmi_base, sdev, config,
				  lock_key, lock_name);
}
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, len);
		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,
};

struct regmap *__regmap_init_spmi_ext(struct spmi_device *sdev,
				      const struct regmap_config *config,
				      struct lock_class_key *lock_key,
				      const char *lock_name)
{
	return __regmap_init(&sdev->dev, &regmap_spmi_ext, sdev, config,
			     lock_key, lock_name);
}
EXPORT_SYMBOL_GPL(__regmap_init_spmi_ext);

struct regmap *__devm_regmap_init_spmi_ext(struct spmi_device *sdev,
					   const struct regmap_config *config,
					   struct lock_class_key *lock_key,
					   const char *lock_name)
{
	return __devm_regmap_init(&sdev->dev, &regmap_spmi_ext, sdev, config,
				  lock_key, lock_name);
}
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
3cfe7a74 NB	94	struct regmap __regmap_init_spmi_base(struct spmi_device sdev,
	95	const struct regmap_config *config,
	96	struct lock_class_key *lock_key,
	97	const char *lock_name)
c9afbb05	98	{
3cfe7a74 NB	99	return __regmap_init(&sdev->dev, &regmap_spmi_base, sdev, config,
3cfe7a74 NB	100	lock_key, lock_name);
c9afbb05	101	}
3cfe7a74	102	EXPORT_SYMBOL_GPL(__regmap_init_spmi_base);
c9afbb05	103
3cfe7a74 NB	104	struct regmap __devm_regmap_init_spmi_base(struct spmi_device sdev,
	105	const struct regmap_config *config,
	106	struct lock_class_key *lock_key,
	107	const char *lock_name)
c9afbb05	108	{
3cfe7a74 NB	109	return __devm_regmap_init(&sdev->dev, &regmap_spmi_base, sdev, config,
3cfe7a74 NB	110	lock_key, lock_name);
c9afbb05	111	}
3cfe7a74	112	EXPORT_SYMBOL_GPL(__devm_regmap_init_spmi_base);
c9afbb05 JC	113
	114	static int regmap_spmi_ext_read(void *context,
	115	const void *reg, size_t reg_size,
	116	void *val, size_t val_size)
	117	{
	118	int err = 0;
	119	size_t len;
	120	u16 addr;
	121
a01779f8	122	BUG_ON(reg_size != 2);
c9afbb05 JC	123
	124	addr = (u16 )reg;
	125
	126	/*
	127	* Split accesses into two to take advantage of the more
	128	* bandwidth-efficient 'Extended Register Read' command when possible
	129	*/
	130	while (addr <= 0xFF && val_size) {
	131	len = min_t(size_t, val_size, 16);
	132
	133	err = spmi_ext_register_read(context, addr, val, len);
	134	if (err)
	135	goto err_out;
	136
	137	addr += len;
	138	val += len;
	139	val_size -= len;
	140	}
	141
	142	while (val_size) {
	143	len = min_t(size_t, val_size, 8);
	144
dec8e8f6	145	err = spmi_ext_register_readl(context, addr, val, len);
c9afbb05 JC	146	if (err)
	147	goto err_out;
	148
	149	addr += len;
	150	val += len;
	151	val_size -= len;
	152	}
	153
	154	err_out:
	155	return err;
a01779f8 JC	156	}
a01779f8 JC	157
c9afbb05 JC	158	static int regmap_spmi_ext_gather_write(void *context,
	159	const void *reg, size_t reg_size,
	160	const void *val, size_t val_size)
a01779f8	161	{
c9afbb05 JC	162	int err = 0;
	163	size_t len;
	164	u16 addr;
	165
a01779f8	166	BUG_ON(reg_size != 2);
c9afbb05 JC	167
	168	addr = (u16 )reg;
	169
	170	while (addr <= 0xFF && val_size) {
	171	len = min_t(size_t, val_size, 16);
	172
	173	err = spmi_ext_register_write(context, addr, val, len);
	174	if (err)
	175	goto err_out;
	176
	177	addr += len;
	178	val += len;
	179	val_size -= len;
	180	}
	181
	182	while (val_size) {
	183	len = min_t(size_t, val_size, 8);
	184
	185	err = spmi_ext_register_writel(context, addr, val, len);
	186	if (err)
	187	goto err_out;
	188
	189	addr += len;
	190	val += len;
	191	val_size -= len;
	192	}
	193
	194	err_out:
	195	return err;
a01779f8 JC	196	}
a01779f8 JC	197
c9afbb05 JC	198	static int regmap_spmi_ext_write(void context, const void data,
c9afbb05 JC	199	size_t count)
a01779f8 JC	200	{
a01779f8 JC	201	BUG_ON(count < 2);
c9afbb05 JC	202	return regmap_spmi_ext_gather_write(context, data, 2, data + 2,
c9afbb05 JC	203	count - 2);
a01779f8 JC	204	}
a01779f8 JC	205
c9afbb05 JC	206	static struct regmap_bus regmap_spmi_ext = {
	207	.read = regmap_spmi_ext_read,
	208	.write = regmap_spmi_ext_write,
	209	.gather_write = regmap_spmi_ext_gather_write,
a01779f8 JC	210	.reg_format_endian_default = REGMAP_ENDIAN_NATIVE,
	211	.val_format_endian_default = REGMAP_ENDIAN_NATIVE,
	212	};
	213
3cfe7a74 NB	214	struct regmap __regmap_init_spmi_ext(struct spmi_device sdev,
	215	const struct regmap_config *config,
	216	struct lock_class_key *lock_key,
	217	const char *lock_name)
a01779f8	218	{
3cfe7a74 NB	219	return __regmap_init(&sdev->dev, &regmap_spmi_ext, sdev, config,
3cfe7a74 NB	220	lock_key, lock_name);
a01779f8	221	}
3cfe7a74	222	EXPORT_SYMBOL_GPL(__regmap_init_spmi_ext);
a01779f8	223
3cfe7a74 NB	224	struct regmap __devm_regmap_init_spmi_ext(struct spmi_device sdev,
	225	const struct regmap_config *config,
	226	struct lock_class_key *lock_key,
	227	const char *lock_name)
a01779f8	228	{
3cfe7a74 NB	229	return __devm_regmap_init(&sdev->dev, &regmap_spmi_ext, sdev, config,
3cfe7a74 NB	230	lock_key, lock_name);
a01779f8	231	}
3cfe7a74	232	EXPORT_SYMBOL_GPL(__devm_regmap_init_spmi_ext);
a01779f8 JC	233
a01779f8 JC	234	MODULE_LICENSE("GPL");