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Commit eea6b7cc authored by Milo Kim's avatar Milo Kim Committed by Samuel Ortiz
Browse files

mfd: Add lp8788 mfd driver 



TI LP8788 PMU provides regulators, battery charger, ADC,
RTC, backlight driver and current sinks.

This MFD patch supports the I2C communication using the regmap,
the interrupt handling using the linear IRQ domain and
configurable platform data structures for each driver module.

 (Driver Architecture)

                                         < mfd devices >
  LP8788 HW  ..........  mfd  .......... regulator drivers
                I2C                      power supply driver
                IRQs                     iio adc driver
                                         rtc driver
                                         backlight driver
                                         current sink drivers

  o regulators    : LDOs and BUCKs
  o power supply  : Battery charger
  o iio adc       : Battery voltage/temperature
  o rtc           : RTC and alarm
  o backlight
  o current sink  : LED and vibrator

All MFD device modules are registered by LP8788 MFD core driver.
For sharing information such like the virtual IRQ number,
MFD core driver uses the resource structure.
Then each module can retrieve the specific IRQ number and detect it
in the IRQ thread.

Configurable platform data is handled in each driver module.

Signed-off-by: default avatarMilo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
parent 804971ec

drivers/mfd/Kconfig

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@@ -440,6 +440,16 @@ config PMIC_ADP5520 
	  individual components like LCD backlight, LEDs, GPIOs and Kepad

	  under the corresponding menus.



config MFD_LP8788

	bool "Texas Instruments LP8788 Power Management Unit Driver"

	depends on I2C=y

	select MFD_CORE

	select REGMAP_I2C

	select IRQ_DOMAIN

	help

	  TI LP8788 PMU supports regulators, battery charger, RTC,

	  ADC, backlight driver and current sinks.



config MFD_MAX77686

	bool "Maxim Semiconductor MAX77686 PMIC Support"

	depends on I2C=y && GENERIC_HARDIRQS

drivers/mfd/Makefile

+2 −0
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@@ -89,6 +89,8 @@ obj-$(CONFIG_PMIC_DA9052) += da9052-core.o 
obj-$(CONFIG_MFD_DA9052_SPI)	+= da9052-spi.o

obj-$(CONFIG_MFD_DA9052_I2C)	+= da9052-i2c.o



obj-$(CONFIG_MFD_LP8788)	+= lp8788.o lp8788-irq.o



obj-$(CONFIG_MFD_MAX77686)	+= max77686.o max77686-irq.o

obj-$(CONFIG_MFD_MAX77693)	+= max77693.o max77693-irq.o

obj-$(CONFIG_MFD_MAX8907)	+= max8907.o

drivers/mfd/lp8788-irq.c

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/*

 * TI LP8788 MFD - interrupt handler

 *

 * Copyright 2012 Texas Instruments

 *

 * Author: Milo(Woogyom) Kim <milo.kim@ti.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/delay.h>

#include <linux/err.h>

#include <linux/interrupt.h>

#include <linux/irq.h>

#include <linux/irqdomain.h>

#include <linux/device.h>

#include <linux/mfd/lp8788.h>

#include <linux/module.h>

#include <linux/slab.h>



/* register address */

#define LP8788_INT_1			0x00

#define LP8788_INTEN_1			0x03



#define BASE_INTEN_ADDR			LP8788_INTEN_1

#define SIZE_REG			8

#define NUM_REGS			3



/*

 * struct lp8788_irq_data

 * @lp               : used for accessing to lp8788 registers

 * @irq_lock         : mutex for enabling/disabling the interrupt

 * @domain           : IRQ domain for handling nested interrupt

 * @enabled          : status of enabled interrupt

 */

struct lp8788_irq_data {

	struct lp8788 *lp;

	struct mutex irq_lock;

	struct irq_domain *domain;

	int enabled[LP8788_INT_MAX];

};



static inline u8 _irq_to_addr(enum lp8788_int_id id)

{

	return id / SIZE_REG;

}



static inline u8 _irq_to_enable_addr(enum lp8788_int_id id)

{

	return _irq_to_addr(id) + BASE_INTEN_ADDR;

}



static inline u8 _irq_to_mask(enum lp8788_int_id id)

{

	return 1 << (id % SIZE_REG);

}



static inline u8 _irq_to_val(enum lp8788_int_id id, int enable)

{

	return enable << (id % SIZE_REG);

}



static void lp8788_irq_enable(struct irq_data *data)

{

	struct lp8788_irq_data *irqd = irq_data_get_irq_chip_data(data);

	irqd->enabled[data->hwirq] = 1;

}



static void lp8788_irq_disable(struct irq_data *data)

{

	struct lp8788_irq_data *irqd = irq_data_get_irq_chip_data(data);

	irqd->enabled[data->hwirq] = 0;

}



static void lp8788_irq_bus_lock(struct irq_data *data)

{

	struct lp8788_irq_data *irqd = irq_data_get_irq_chip_data(data);



	mutex_lock(&irqd->irq_lock);

}



static void lp8788_irq_bus_sync_unlock(struct irq_data *data)

{

	struct lp8788_irq_data *irqd = irq_data_get_irq_chip_data(data);

	enum lp8788_int_id irq = data->hwirq;

	u8 addr, mask, val;



	addr = _irq_to_enable_addr(irq);

	mask = _irq_to_mask(irq);

	val = _irq_to_val(irq, irqd->enabled[irq]);



	lp8788_update_bits(irqd->lp, addr, mask, val);



	mutex_unlock(&irqd->irq_lock);

}



static struct irq_chip lp8788_irq_chip = {

	.name			= "lp8788",

	.irq_enable		= lp8788_irq_enable,

	.irq_disable		= lp8788_irq_disable,

	.irq_bus_lock		= lp8788_irq_bus_lock,

	.irq_bus_sync_unlock	= lp8788_irq_bus_sync_unlock,

};



static irqreturn_t lp8788_irq_handler(int irq, void *ptr)

{

	struct lp8788_irq_data *irqd = ptr;

	struct lp8788 *lp = irqd->lp;

	u8 status[NUM_REGS], addr, mask;

	bool handled;

	int i;



	if (lp8788_read_multi_bytes(lp, LP8788_INT_1, status, NUM_REGS))

		return IRQ_NONE;



	for (i = 0 ; i < LP8788_INT_MAX ; i++) {

		addr = _irq_to_addr(i);

		mask = _irq_to_mask(i);



		/* reporting only if the irq is enabled */

		if (status[addr] & mask) {

			handle_nested_irq(irq_find_mapping(irqd->domain, i));

			handled = true;

		}

	}



	return handled ? IRQ_HANDLED : IRQ_NONE;

}



static int lp8788_irq_map(struct irq_domain *d, unsigned int virq,

			irq_hw_number_t hwirq)

{

	struct lp8788_irq_data *irqd = d->host_data;

	struct irq_chip *chip = &lp8788_irq_chip;



	irq_set_chip_data(virq, irqd);

	irq_set_chip_and_handler(virq, chip, handle_edge_irq);

	irq_set_nested_thread(virq, 1);



#ifdef CONFIG_ARM

	set_irq_flags(virq, IRQF_VALID);

#else

	irq_set_noprobe(virq);

#endif



	return 0;

}



static struct irq_domain_ops lp8788_domain_ops = {

	.map = lp8788_irq_map,

};



int lp8788_irq_init(struct lp8788 *lp, int irq)

{

	struct lp8788_irq_data *irqd;

	int ret;



	if (irq <= 0) {

		dev_warn(lp->dev, "invalid irq number: %d\n", irq);

		return 0;

	}



	irqd = devm_kzalloc(lp->dev, sizeof(*irqd), GFP_KERNEL);

	if (!irqd)

		return -ENOMEM;



	irqd->lp = lp;

	irqd->domain = irq_domain_add_linear(lp->dev->of_node, LP8788_INT_MAX,

					&lp8788_domain_ops, irqd);

	if (!irqd->domain) {

		dev_err(lp->dev, "failed to add irq domain err\n");

		return -EINVAL;

	}



	lp->irqdm = irqd->domain;

	mutex_init(&irqd->irq_lock);



	ret = request_threaded_irq(irq, NULL, lp8788_irq_handler,

				IRQF_TRIGGER_FALLING | IRQF_ONESHOT,

				"lp8788-irq", irqd);

	if (ret) {

		dev_err(lp->dev, "failed to create a thread for IRQ_N\n");

		return ret;

	}



	lp->irq = irq;



	return 0;

}



void lp8788_irq_exit(struct lp8788 *lp)

{

	if (lp->irq)

		free_irq(lp->irq, lp->irqdm);

}

drivers/mfd/lp8788.c

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/*

 * TI LP8788 MFD - core interface

 *

 * Copyright 2012 Texas Instruments

 *

 * Author: Milo(Woogyom) Kim <milo.kim@ti.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/err.h>

#include <linux/i2c.h>

#include <linux/mfd/core.h>

#include <linux/mfd/lp8788.h>

#include <linux/module.h>

#include <linux/slab.h>



#define MAX_LP8788_REGISTERS		0xA2



#define MFD_DEV_SIMPLE(_name)					\

{								\

	.name = LP8788_DEV_##_name,				\

}



#define MFD_DEV_WITH_ID(_name, _id)				\

{								\

	.name = LP8788_DEV_##_name,				\

	.id = _id,						\

}



#define MFD_DEV_WITH_RESOURCE(_name, _resource, num_resource)	\

{								\

	.name = LP8788_DEV_##_name,				\

	.resources = _resource,					\

	.num_resources = num_resource,				\

}



static struct resource chg_irqs[] = {

	/* Charger Interrupts */

	{

		.start = LP8788_INT_CHG_INPUT_STATE,

		.end   = LP8788_INT_PRECHG_TIMEOUT,

		.name  = LP8788_CHG_IRQ,

		.flags = IORESOURCE_IRQ,

	},

	/* Power Routing Switch Interrupts */

	{

		.start = LP8788_INT_ENTER_SYS_SUPPORT,

		.end   = LP8788_INT_EXIT_SYS_SUPPORT,

		.name  = LP8788_PRSW_IRQ,

		.flags = IORESOURCE_IRQ,

	},

	/* Battery Interrupts */

	{

		.start = LP8788_INT_BATT_LOW,

		.end   = LP8788_INT_NO_BATT,

		.name  = LP8788_BATT_IRQ,

		.flags = IORESOURCE_IRQ,

	},

};



static struct resource rtc_irqs[] = {

	{

		.start = LP8788_INT_RTC_ALARM1,

		.end   = LP8788_INT_RTC_ALARM2,

		.name  = LP8788_ALM_IRQ,

		.flags = IORESOURCE_IRQ,

	},

};



static struct mfd_cell lp8788_devs[] = {

	/* 4 bucks */

	MFD_DEV_WITH_ID(BUCK, 1),

	MFD_DEV_WITH_ID(BUCK, 2),

	MFD_DEV_WITH_ID(BUCK, 3),

	MFD_DEV_WITH_ID(BUCK, 4),



	/* 12 digital ldos */

	MFD_DEV_WITH_ID(DLDO, 1),

	MFD_DEV_WITH_ID(DLDO, 2),

	MFD_DEV_WITH_ID(DLDO, 3),

	MFD_DEV_WITH_ID(DLDO, 4),

	MFD_DEV_WITH_ID(DLDO, 5),

	MFD_DEV_WITH_ID(DLDO, 6),

	MFD_DEV_WITH_ID(DLDO, 7),

	MFD_DEV_WITH_ID(DLDO, 8),

	MFD_DEV_WITH_ID(DLDO, 9),

	MFD_DEV_WITH_ID(DLDO, 10),

	MFD_DEV_WITH_ID(DLDO, 11),

	MFD_DEV_WITH_ID(DLDO, 12),



	/* 10 analog ldos */

	MFD_DEV_WITH_ID(ALDO, 1),

	MFD_DEV_WITH_ID(ALDO, 2),

	MFD_DEV_WITH_ID(ALDO, 3),

	MFD_DEV_WITH_ID(ALDO, 4),

	MFD_DEV_WITH_ID(ALDO, 5),

	MFD_DEV_WITH_ID(ALDO, 6),

	MFD_DEV_WITH_ID(ALDO, 7),

	MFD_DEV_WITH_ID(ALDO, 8),

	MFD_DEV_WITH_ID(ALDO, 9),

	MFD_DEV_WITH_ID(ALDO, 10),



	/* ADC */

	MFD_DEV_SIMPLE(ADC),



	/* battery charger */

	MFD_DEV_WITH_RESOURCE(CHARGER, chg_irqs, ARRAY_SIZE(chg_irqs)),



	/* rtc */

	MFD_DEV_WITH_RESOURCE(RTC, rtc_irqs, ARRAY_SIZE(rtc_irqs)),



	/* backlight */

	MFD_DEV_SIMPLE(BACKLIGHT),



	/* current sink for vibrator */

	MFD_DEV_SIMPLE(VIBRATOR),



	/* current sink for keypad LED */

	MFD_DEV_SIMPLE(KEYLED),

};



int lp8788_read_byte(struct lp8788 *lp, u8 reg, u8 *data)

{

	int ret;

	unsigned int val;



	ret = regmap_read(lp->regmap, reg, &val);

	if (ret < 0) {

		dev_err(lp->dev, "failed to read 0x%.2x\n", reg);

		return ret;

	}



	*data = (u8)val;

	return 0;

}

EXPORT_SYMBOL_GPL(lp8788_read_byte);



int lp8788_read_multi_bytes(struct lp8788 *lp, u8 reg, u8 *data, size_t count)

{

	return regmap_bulk_read(lp->regmap, reg, data, count);

}

EXPORT_SYMBOL_GPL(lp8788_read_multi_bytes);



int lp8788_write_byte(struct lp8788 *lp, u8 reg, u8 data)

{

	return regmap_write(lp->regmap, reg, data);

}

EXPORT_SYMBOL_GPL(lp8788_write_byte);



int lp8788_update_bits(struct lp8788 *lp, u8 reg, u8 mask, u8 data)

{

	return regmap_update_bits(lp->regmap, reg, mask, data);

}

EXPORT_SYMBOL_GPL(lp8788_update_bits);



static int lp8788_platform_init(struct lp8788 *lp)

{

	struct lp8788_platform_data *pdata = lp->pdata;



	return (pdata && pdata->init_func) ? pdata->init_func(lp) : 0;

}



static const struct regmap_config lp8788_regmap_config = {

	.reg_bits = 8,

	.val_bits = 8,

	.max_register = MAX_LP8788_REGISTERS,

};



static int lp8788_probe(struct i2c_client *cl, const struct i2c_device_id *id)

{

	struct lp8788 *lp;

	struct lp8788_platform_data *pdata = cl->dev.platform_data;

	int ret;



	lp = devm_kzalloc(&cl->dev, sizeof(struct lp8788), GFP_KERNEL);

	if (!lp)

		return -ENOMEM;



	lp->regmap = devm_regmap_init_i2c(cl, &lp8788_regmap_config);

	if (IS_ERR(lp->regmap)) {

		ret = PTR_ERR(lp->regmap);

		dev_err(&cl->dev, "regmap init i2c err: %d\n", ret);

		return ret;

	}



	lp->pdata = pdata;

	lp->dev = &cl->dev;

	i2c_set_clientdata(cl, lp);



	ret = lp8788_platform_init(lp);

	if (ret)

		return ret;



	ret = lp8788_irq_init(lp, cl->irq);

	if (ret)

		return ret;



	return mfd_add_devices(lp->dev, -1, lp8788_devs,

			       ARRAY_SIZE(lp8788_devs), NULL, 0, NULL);

}



static int __devexit lp8788_remove(struct i2c_client *cl)

{

	struct lp8788 *lp = i2c_get_clientdata(cl);



	mfd_remove_devices(lp->dev);

	lp8788_irq_exit(lp);

	return 0;

}



static const struct i2c_device_id lp8788_ids[] = {

	{"lp8788", 0},

	{ }

};

MODULE_DEVICE_TABLE(i2c, lp8788_ids);



static struct i2c_driver lp8788_driver = {

	.driver = {

		.name = "lp8788",

		.owner = THIS_MODULE,

	},

	.probe = lp8788_probe,

	.remove = __devexit_p(lp8788_remove),

	.id_table = lp8788_ids,

};



static int __init lp8788_init(void)

{

	return i2c_add_driver(&lp8788_driver);

}

subsys_initcall(lp8788_init);



static void __exit lp8788_exit(void)

{

	i2c_del_driver(&lp8788_driver);

}

module_exit(lp8788_exit);



MODULE_DESCRIPTION("TI LP8788 MFD Driver");

MODULE_AUTHOR("Milo Kim");

MODULE_LICENSE("GPL");

include/linux/mfd/lp8788-isink.h

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/*

 * TI LP8788 MFD - common definitions for current sinks

 *

 * Copyright 2012 Texas Instruments

 *

 * Author: Milo(Woogyom) Kim <milo.kim@ti.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.

 *

 */



#ifndef __ISINK_LP8788_H__

#define __ISINK_LP8788_H__



/* register address */

#define LP8788_ISINK_CTRL		0x99

#define LP8788_ISINK12_IOUT		0x9A

#define LP8788_ISINK3_IOUT		0x9B

#define LP8788_ISINK1_PWM		0x9C

#define LP8788_ISINK2_PWM		0x9D

#define LP8788_ISINK3_PWM		0x9E



/* mask bits */

#define LP8788_ISINK1_IOUT_M		0x0F	/* Addr 9Ah */

#define LP8788_ISINK2_IOUT_M		0xF0

#define LP8788_ISINK3_IOUT_M		0x0F	/* Addr 9Bh */



/* 6 bits used for PWM code : Addr 9C ~ 9Eh */

#define LP8788_ISINK_MAX_PWM		63

#define LP8788_ISINK_SCALE_OFFSET	3



static const u8 lp8788_iout_addr[] = {

	LP8788_ISINK12_IOUT,

	LP8788_ISINK12_IOUT,

	LP8788_ISINK3_IOUT,

};



static const u8 lp8788_iout_mask[] = {

	LP8788_ISINK1_IOUT_M,

	LP8788_ISINK2_IOUT_M,

	LP8788_ISINK3_IOUT_M,

};



static const u8 lp8788_pwm_addr[] = {

	LP8788_ISINK1_PWM,

	LP8788_ISINK2_PWM,

	LP8788_ISINK3_PWM,

};



#endif