Commit acad189b authored by Guennadi Liakhovetski's avatar Guennadi Liakhovetski Committed by Samuel Ortiz
Browse files

mfd: Add an AS3711 PMIC MFD driver 



AS3711 is a PMIC with multiple DCDC and LDO power supplies, GPIOs, an RTC,
a battery charger and a general purpose ADC. This patch adds support for
the MFD with support for a regulator driver and a backlight driver.

Signed-off-by: default avatarGuennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
parent cb5faba9

drivers/mfd/Kconfig

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@@ -1103,6 +1103,15 @@ config MFD_RETU 
	  Retu is a multi-function device found on Nokia Internet Tablets

	  (770, N800 and N810).



config MFD_AS3711

	bool "Support for AS3711"

	select MFD_CORE

	select REGMAP_I2C

	select REGMAP_IRQ

	depends on I2C=y

	help

	  Support for the AS3711 PMIC from AMS



endmenu

endif

drivers/mfd/Makefile

+1 −0
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@@ -146,3 +146,4 @@ obj-$(CONFIG_MFD_SEC_CORE) += sec-core.o sec-irq.o 
obj-$(CONFIG_MFD_SYSCON)	+= syscon.o

obj-$(CONFIG_MFD_LM3533)	+= lm3533-core.o lm3533-ctrlbank.o

obj-$(CONFIG_MFD_RETU)		+= retu-mfd.o

obj-$(CONFIG_MFD_AS3711)	+= as3711.o

drivers/mfd/as3711.c

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/*

 * AS3711 PMIC MFC driver

 *

 * Copyright (C) 2012 Renesas Electronics Corporation

 * Author: Guennadi Liakhovetski, <g.liakhovetski@gmx.de>

 *

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

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

 * published by the Free Software Foundation

 */



#include <linux/device.h>

#include <linux/err.h>

#include <linux/i2c.h>

#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/mfd/as3711.h>

#include <linux/mfd/core.h>

#include <linux/module.h>

#include <linux/regmap.h>

#include <linux/slab.h>



enum {

	AS3711_REGULATOR,

	AS3711_BACKLIGHT,

};



/*

 * Ok to have it static: it is only used during probing and multiple I2C devices

 * cannot be probed simultaneously. Just make sure to avoid stale data.

 */

static struct mfd_cell as3711_subdevs[] = {

	[AS3711_REGULATOR] = {.name = "as3711-regulator",},

	[AS3711_BACKLIGHT] = {.name = "as3711-backlight",},

};



static bool as3711_volatile_reg(struct device *dev, unsigned int reg)

{

	switch (reg) {

	case AS3711_GPIO_SIGNAL_IN:

	case AS3711_INTERRUPT_STATUS_1:

	case AS3711_INTERRUPT_STATUS_2:

	case AS3711_INTERRUPT_STATUS_3:

	case AS3711_CHARGER_STATUS_1:

	case AS3711_CHARGER_STATUS_2:

	case AS3711_REG_STATUS:

		return true;

	}

	return false;

}



static bool as3711_precious_reg(struct device *dev, unsigned int reg)

{

	switch (reg) {

	case AS3711_INTERRUPT_STATUS_1:

	case AS3711_INTERRUPT_STATUS_2:

	case AS3711_INTERRUPT_STATUS_3:

		return true;

	}

	return false;

}



static bool as3711_readable_reg(struct device *dev, unsigned int reg)

{

	switch (reg) {

	case AS3711_SD_1_VOLTAGE:

	case AS3711_SD_2_VOLTAGE:

	case AS3711_SD_3_VOLTAGE:

	case AS3711_SD_4_VOLTAGE:

	case AS3711_LDO_1_VOLTAGE:

	case AS3711_LDO_2_VOLTAGE:

	case AS3711_LDO_3_VOLTAGE:

	case AS3711_LDO_4_VOLTAGE:

	case AS3711_LDO_5_VOLTAGE:

	case AS3711_LDO_6_VOLTAGE:

	case AS3711_LDO_7_VOLTAGE:

	case AS3711_LDO_8_VOLTAGE:

	case AS3711_SD_CONTROL:

	case AS3711_GPIO_SIGNAL_OUT:

	case AS3711_GPIO_SIGNAL_IN:

	case AS3711_SD_CONTROL_1:

	case AS3711_SD_CONTROL_2:

	case AS3711_CURR_CONTROL:

	case AS3711_CURR1_VALUE:

	case AS3711_CURR2_VALUE:

	case AS3711_CURR3_VALUE:

	case AS3711_STEPUP_CONTROL_1:

	case AS3711_STEPUP_CONTROL_2:

	case AS3711_STEPUP_CONTROL_4:

	case AS3711_STEPUP_CONTROL_5:

	case AS3711_REG_STATUS:

	case AS3711_INTERRUPT_STATUS_1:

	case AS3711_INTERRUPT_STATUS_2:

	case AS3711_INTERRUPT_STATUS_3:

	case AS3711_CHARGER_STATUS_1:

	case AS3711_CHARGER_STATUS_2:

	case AS3711_ASIC_ID_1:

	case AS3711_ASIC_ID_2:

		return true;

	}

	return false;

}



static const struct regmap_config as3711_regmap_config = {

	.reg_bits = 8,

	.val_bits = 8,

	.volatile_reg = as3711_volatile_reg,

	.readable_reg = as3711_readable_reg,

	.precious_reg = as3711_precious_reg,

	.max_register = AS3711_MAX_REGS,

	.num_reg_defaults_raw = AS3711_MAX_REGS,

	.cache_type = REGCACHE_RBTREE,

};



static int as3711_i2c_probe(struct i2c_client *client,

			    const struct i2c_device_id *id)

{

	struct as3711 *as3711;

	struct as3711_platform_data *pdata = client->dev.platform_data;

	unsigned int id1, id2;

	int ret;



	if (!pdata)

		dev_dbg(&client->dev, "Platform data not found\n");



	as3711 = devm_kzalloc(&client->dev, sizeof(struct as3711), GFP_KERNEL);

	if (!as3711) {

		dev_err(&client->dev, "Memory allocation failed\n");

		return -ENOMEM;

	}



	as3711->dev = &client->dev;

	i2c_set_clientdata(client, as3711);



	if (client->irq)

		dev_notice(&client->dev, "IRQ not supported yet\n");



	as3711->regmap = devm_regmap_init_i2c(client, &as3711_regmap_config);

	if (IS_ERR(as3711->regmap)) {

		ret = PTR_ERR(as3711->regmap);

		dev_err(&client->dev, "regmap initialization failed: %d\n", ret);

		return ret;

	}



	ret = regmap_read(as3711->regmap, AS3711_ASIC_ID_1, &id1);

	if (!ret)

		ret = regmap_read(as3711->regmap, AS3711_ASIC_ID_2, &id2);

	if (ret < 0) {

		dev_err(&client->dev, "regmap_read() failed: %d\n", ret);

		return ret;

	}

	if (id1 != 0x8b)

		return -ENODEV;

	dev_info(as3711->dev, "AS3711 detected: %x:%x\n", id1, id2);



	/* We can reuse as3711_subdevs[], it will be copied in mfd_add_devices() */

	if (pdata) {

		as3711_subdevs[AS3711_REGULATOR].platform_data = &pdata->regulator;

		as3711_subdevs[AS3711_REGULATOR].pdata_size = sizeof(pdata->regulator);

		as3711_subdevs[AS3711_BACKLIGHT].platform_data = &pdata->backlight;

		as3711_subdevs[AS3711_BACKLIGHT].pdata_size = sizeof(pdata->backlight);

	} else {

		as3711_subdevs[AS3711_REGULATOR].platform_data = NULL;

		as3711_subdevs[AS3711_REGULATOR].pdata_size = 0;

		as3711_subdevs[AS3711_BACKLIGHT].platform_data = NULL;

		as3711_subdevs[AS3711_BACKLIGHT].pdata_size = 0;

	}



	ret = mfd_add_devices(as3711->dev, -1, as3711_subdevs,

			      ARRAY_SIZE(as3711_subdevs), NULL, 0, NULL);

	if (ret < 0)

		dev_err(&client->dev, "add mfd devices failed: %d\n", ret);



	return ret;

}



static int as3711_i2c_remove(struct i2c_client *client)

{

	struct as3711 *as3711 = i2c_get_clientdata(client);



	mfd_remove_devices(as3711->dev);

	return 0;

}



static const struct i2c_device_id as3711_i2c_id[] = {

	{.name = "as3711", .driver_data = 0},

	{}

};



MODULE_DEVICE_TABLE(i2c, as3711_i2c_id);



static struct i2c_driver as3711_i2c_driver = {

	.driver = {

		   .name = "as3711",

		   .owner = THIS_MODULE,

		   },

	.probe = as3711_i2c_probe,

	.remove = as3711_i2c_remove,

	.id_table = as3711_i2c_id,

};



static int __init as3711_i2c_init(void)

{

	return i2c_add_driver(&as3711_i2c_driver);

}

/* Initialise early */

subsys_initcall(as3711_i2c_init);



static void __exit as3711_i2c_exit(void)

{

	i2c_del_driver(&as3711_i2c_driver);

}

module_exit(as3711_i2c_exit);



MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");

MODULE_DESCRIPTION("AS3711 PMIC driver");

MODULE_LICENSE("GPL v2");

include/linux/mfd/as3711.h

0 → 100644
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/*

 * AS3711 PMIC MFC driver header

 *

 * Copyright (C) 2012 Renesas Electronics Corporation

 * Author: Guennadi Liakhovetski, <g.liakhovetski@gmx.de>

 *

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

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

 * published by the Free Software Foundation

 */



#ifndef MFD_AS3711_H

#define MFD_AS3711_H



/*

 * Client data

 */



/* Register addresses */

#define AS3711_SD_1_VOLTAGE		0	/* Digital Step-Down */

#define AS3711_SD_2_VOLTAGE		1

#define AS3711_SD_3_VOLTAGE		2

#define AS3711_SD_4_VOLTAGE		3

#define AS3711_LDO_1_VOLTAGE		4	/* Analog LDO */

#define AS3711_LDO_2_VOLTAGE		5

#define AS3711_LDO_3_VOLTAGE		6	/* Digital LDO */

#define AS3711_LDO_4_VOLTAGE		7

#define AS3711_LDO_5_VOLTAGE		8

#define AS3711_LDO_6_VOLTAGE		9

#define AS3711_LDO_7_VOLTAGE		0xa

#define AS3711_LDO_8_VOLTAGE		0xb

#define AS3711_SD_CONTROL		0x10

#define AS3711_GPIO_SIGNAL_OUT		0x20

#define AS3711_GPIO_SIGNAL_IN		0x21

#define AS3711_SD_CONTROL_1		0x30

#define AS3711_SD_CONTROL_2		0x31

#define AS3711_CURR_CONTROL		0x40

#define AS3711_CURR1_VALUE		0x43

#define AS3711_CURR2_VALUE		0x44

#define AS3711_CURR3_VALUE		0x45

#define AS3711_STEPUP_CONTROL_1		0x50

#define AS3711_STEPUP_CONTROL_2		0x51

#define AS3711_STEPUP_CONTROL_4		0x53

#define AS3711_STEPUP_CONTROL_5		0x54

#define AS3711_REG_STATUS		0x73

#define AS3711_INTERRUPT_STATUS_1	0x77

#define AS3711_INTERRUPT_STATUS_2	0x78

#define AS3711_INTERRUPT_STATUS_3	0x79

#define AS3711_CHARGER_STATUS_1		0x86

#define AS3711_CHARGER_STATUS_2		0x87

#define AS3711_ASIC_ID_1		0x90

#define AS3711_ASIC_ID_2		0x91



#define AS3711_MAX_REGS			0x92



/* Regulators */

enum {

	AS3711_REGULATOR_SD_1,

	AS3711_REGULATOR_SD_2,

	AS3711_REGULATOR_SD_3,

	AS3711_REGULATOR_SD_4,

	AS3711_REGULATOR_LDO_1,

	AS3711_REGULATOR_LDO_2,

	AS3711_REGULATOR_LDO_3,

	AS3711_REGULATOR_LDO_4,

	AS3711_REGULATOR_LDO_5,

	AS3711_REGULATOR_LDO_6,

	AS3711_REGULATOR_LDO_7,

	AS3711_REGULATOR_LDO_8,



	AS3711_REGULATOR_MAX,

};



struct device;

struct regmap;



struct as3711 {

	struct device *dev;

	struct regmap *regmap;

};



#define AS3711_MAX_STEPDOWN 4

#define AS3711_MAX_STEPUP 2

#define AS3711_MAX_LDO 8



enum as3711_su2_feedback {

	AS3711_SU2_VOLTAGE,

	AS3711_SU2_CURR1,

	AS3711_SU2_CURR2,

	AS3711_SU2_CURR3,

	AS3711_SU2_CURR_AUTO,

};



enum as3711_su2_fbprot {

	AS3711_SU2_LX_SD4,

	AS3711_SU2_GPIO2,

	AS3711_SU2_GPIO3,

	AS3711_SU2_GPIO4,

};



/*

 * Platform data

 */



struct as3711_regulator_pdata {

	struct regulator_init_data *init_data[AS3711_REGULATOR_MAX];

};



struct as3711_bl_pdata {

	const char *su1_fb;

	int su1_max_uA;

	const char *su2_fb;

	int su2_max_uA;

	enum as3711_su2_feedback su2_feedback;

	enum as3711_su2_fbprot su2_fbprot;

	bool su2_auto_curr1;

	bool su2_auto_curr2;

	bool su2_auto_curr3;

};



struct as3711_platform_data {

	struct as3711_regulator_pdata regulator;

	struct as3711_bl_pdata backlight;

};



#endif