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Commit b4ecd326 authored by Rabin Vincent's avatar Rabin Vincent Committed by Samuel Ortiz
Browse files

mfd: Add Toshiba's TC35892 MFD core 



The TC35892 I/O Expander provides 24 GPIOs, a keypad controller, timers,
and a rotator wheel interface.  This patch adds the MFD core.

Acked-by: default avatarLinus Walleij <linus.walleij@stericsson.com>
Signed-off-by: default avatarRabin Vincent <rabin.vincent@stericsson.com>
Signed-off-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
parent 68e488d9

drivers/mfd/Kconfig

+11 −0
Original line number Original line Diff line number Diff line
@@ -171,6 +171,17 @@ config TWL4030_CODEC 
	select MFD_CORE

	select MFD_CORE

	default n

	default n





config MFD_TC35892

	bool "Support Toshiba TC35892"

	depends on I2C=y && GENERIC_HARDIRQS

	select MFD_CORE

	help

	  Support for the Toshiba TC35892 I/O Expander.



	  This driver provides common support for accessing the device,

	  additional drivers must be enabled in order to use the

	  functionality of the device.



config MFD_TMIO

config MFD_TMIO

	bool

	bool

	default n

	default n

drivers/mfd/Makefile

+1 −0
Original line number Original line Diff line number Diff line
@@ -15,6 +15,7 @@ obj-$(CONFIG_HTC_I2CPLD) += htc-i2cpld.o 
obj-$(CONFIG_MFD_DAVINCI_VOICECODEC)	+= davinci_voicecodec.o

obj-$(CONFIG_MFD_DAVINCI_VOICECODEC)	+= davinci_voicecodec.o

obj-$(CONFIG_MFD_DM355EVM_MSP)	+= dm355evm_msp.o

obj-$(CONFIG_MFD_DM355EVM_MSP)	+= dm355evm_msp.o





obj-$(CONFIG_MFD_TC35892)	+= tc35892.o

obj-$(CONFIG_MFD_T7L66XB)	+= t7l66xb.o tmio_core.o

obj-$(CONFIG_MFD_T7L66XB)	+= t7l66xb.o tmio_core.o

obj-$(CONFIG_MFD_TC6387XB)	+= tc6387xb.o tmio_core.o

obj-$(CONFIG_MFD_TC6387XB)	+= tc6387xb.o tmio_core.o

obj-$(CONFIG_MFD_TC6393XB)	+= tc6393xb.o tmio_core.o

obj-$(CONFIG_MFD_TC6393XB)	+= tc6393xb.o tmio_core.o

drivers/mfd/tc35892.c

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/*

 * Copyright (C) ST-Ericsson SA 2010

 *

 * License Terms: GNU General Public License, version 2

 * Author: Hanumath Prasad <hanumath.prasad@stericsson.com> for ST-Ericsson

 * Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson

 */



#include <linux/module.h>

#include <linux/interrupt.h>

#include <linux/irq.h>

#include <linux/slab.h>

#include <linux/i2c.h>

#include <linux/mfd/core.h>

#include <linux/mfd/tc35892.h>



/**

 * tc35892_reg_read() - read a single TC35892 register

 * @tc35892:	Device to read from

 * @reg:	Register to read

 */

int tc35892_reg_read(struct tc35892 *tc35892, u8 reg)

{

	int ret;



	ret = i2c_smbus_read_byte_data(tc35892->i2c, reg);

	if (ret < 0)

		dev_err(tc35892->dev, "failed to read reg %#x: %d\n",

			reg, ret);



	return ret;

}

EXPORT_SYMBOL_GPL(tc35892_reg_read);



/**

 * tc35892_reg_read() - write a single TC35892 register

 * @tc35892:	Device to write to

 * @reg:	Register to read

 * @data:	Value to write

 */

int tc35892_reg_write(struct tc35892 *tc35892, u8 reg, u8 data)

{

	int ret;



	ret = i2c_smbus_write_byte_data(tc35892->i2c, reg, data);

	if (ret < 0)

		dev_err(tc35892->dev, "failed to write reg %#x: %d\n",

			reg, ret);



	return ret;

}

EXPORT_SYMBOL_GPL(tc35892_reg_write);



/**

 * tc35892_block_read() - read multiple TC35892 registers

 * @tc35892:	Device to read from

 * @reg:	First register

 * @length:	Number of registers

 * @values:	Buffer to write to

 */

int tc35892_block_read(struct tc35892 *tc35892, u8 reg, u8 length, u8 *values)

{

	int ret;



	ret = i2c_smbus_read_i2c_block_data(tc35892->i2c, reg, length, values);

	if (ret < 0)

		dev_err(tc35892->dev, "failed to read regs %#x: %d\n",

			reg, ret);



	return ret;

}

EXPORT_SYMBOL_GPL(tc35892_block_read);



/**

 * tc35892_block_write() - write multiple TC35892 registers

 * @tc35892:	Device to write to

 * @reg:	First register

 * @length:	Number of registers

 * @values:	Values to write

 */

int tc35892_block_write(struct tc35892 *tc35892, u8 reg, u8 length,

			const u8 *values)

{

	int ret;



	ret = i2c_smbus_write_i2c_block_data(tc35892->i2c, reg, length,

					     values);

	if (ret < 0)

		dev_err(tc35892->dev, "failed to write regs %#x: %d\n",

			reg, ret);



	return ret;

}

EXPORT_SYMBOL_GPL(tc35892_block_write);



/**

 * tc35892_set_bits() - set the value of a bitfield in a TC35892 register

 * @tc35892:	Device to write to

 * @reg:	Register to write

 * @mask:	Mask of bits to set

 * @values:	Value to set

 */

int tc35892_set_bits(struct tc35892 *tc35892, u8 reg, u8 mask, u8 val)

{

	int ret;



	mutex_lock(&tc35892->lock);



	ret = tc35892_reg_read(tc35892, reg);

	if (ret < 0)

		goto out;



	ret &= ~mask;

	ret |= val;



	ret = tc35892_reg_write(tc35892, reg, ret);



out:

	mutex_unlock(&tc35892->lock);

	return ret;

}

EXPORT_SYMBOL_GPL(tc35892_set_bits);



static struct resource gpio_resources[] = {

	{

		.start	= TC35892_INT_GPIIRQ,

		.end	= TC35892_INT_GPIIRQ,

		.flags	= IORESOURCE_IRQ,

	},

};



static struct mfd_cell tc35892_devs[] = {

	{

		.name		= "tc35892-gpio",

		.num_resources	= ARRAY_SIZE(gpio_resources),

		.resources	= &gpio_resources[0],

	},

};



static irqreturn_t tc35892_irq(int irq, void *data)

{

	struct tc35892 *tc35892 = data;

	int status;



	status = tc35892_reg_read(tc35892, TC35892_IRQST);

	if (status < 0)

		return IRQ_NONE;



	while (status) {

		int bit = __ffs(status);



		handle_nested_irq(tc35892->irq_base + bit);

		status &= ~(1 << bit);

	}



	/*

	 * A dummy read or write (to any register) appears to be necessary to

	 * have the last interrupt clear (for example, GPIO IC write) take

	 * effect.

	 */

	tc35892_reg_read(tc35892, TC35892_IRQST);



	return IRQ_HANDLED;

}



static void tc35892_irq_dummy(unsigned int irq)

{

	/* No mask/unmask at this level */

}



static struct irq_chip tc35892_irq_chip = {

	.name	= "tc35892",

	.mask	= tc35892_irq_dummy,

	.unmask	= tc35892_irq_dummy,

};



static int tc35892_irq_init(struct tc35892 *tc35892)

{

	int base = tc35892->irq_base;

	int irq;



	for (irq = base; irq < base + TC35892_NR_INTERNAL_IRQS; irq++) {

		set_irq_chip_data(irq, tc35892);

		set_irq_chip_and_handler(irq, &tc35892_irq_chip,

					 handle_edge_irq);

		set_irq_nested_thread(irq, 1);

#ifdef CONFIG_ARM

		set_irq_flags(irq, IRQF_VALID);

#else

		set_irq_noprobe(irq);

#endif

	}



	return 0;

}



static void tc35892_irq_remove(struct tc35892 *tc35892)

{

	int base = tc35892->irq_base;

	int irq;



	for (irq = base; irq < base + TC35892_NR_INTERNAL_IRQS; irq++) {

#ifdef CONFIG_ARM

		set_irq_flags(irq, 0);

#endif

		set_irq_chip_and_handler(irq, NULL, NULL);

		set_irq_chip_data(irq, NULL);

	}

}



static int tc35892_chip_init(struct tc35892 *tc35892)

{

	int manf, ver, ret;



	manf = tc35892_reg_read(tc35892, TC35892_MANFCODE);

	if (manf < 0)

		return manf;



	ver = tc35892_reg_read(tc35892, TC35892_VERSION);

	if (ver < 0)

		return ver;



	if (manf != TC35892_MANFCODE_MAGIC) {

		dev_err(tc35892->dev, "unknown manufacturer: %#x\n", manf);

		return -EINVAL;

	}



	dev_info(tc35892->dev, "manufacturer: %#x, version: %#x\n", manf, ver);



	/* Put everything except the IRQ module into reset */

	ret = tc35892_reg_write(tc35892, TC35892_RSTCTRL,

				TC35892_RSTCTRL_TIMRST

				| TC35892_RSTCTRL_ROTRST

				| TC35892_RSTCTRL_KBDRST

				| TC35892_RSTCTRL_GPIRST);

	if (ret < 0)

		return ret;



	/* Clear the reset interrupt. */

	return tc35892_reg_write(tc35892, TC35892_RSTINTCLR, 0x1);

}



static int __devinit tc35892_probe(struct i2c_client *i2c,

				   const struct i2c_device_id *id)

{

	struct tc35892_platform_data *pdata = i2c->dev.platform_data;

	struct tc35892 *tc35892;

	int ret;



	if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA

				     | I2C_FUNC_SMBUS_I2C_BLOCK))

		return -EIO;



	tc35892 = kzalloc(sizeof(struct tc35892), GFP_KERNEL);

	if (!tc35892)

		return -ENOMEM;



	mutex_init(&tc35892->lock);



	tc35892->dev = &i2c->dev;

	tc35892->i2c = i2c;

	tc35892->pdata = pdata;

	tc35892->irq_base = pdata->irq_base;

	tc35892->num_gpio = id->driver_data;



	i2c_set_clientdata(i2c, tc35892);



	ret = tc35892_chip_init(tc35892);

	if (ret)

		goto out_free;



	ret = tc35892_irq_init(tc35892);

	if (ret)

		goto out_free;



	ret = request_threaded_irq(tc35892->i2c->irq, NULL, tc35892_irq,

				   IRQF_TRIGGER_FALLING | IRQF_ONESHOT,

				   "tc35892", tc35892);

	if (ret) {

		dev_err(tc35892->dev, "failed to request IRQ: %d\n", ret);

		goto out_removeirq;

	}



	ret = mfd_add_devices(tc35892->dev, -1, tc35892_devs,

			      ARRAY_SIZE(tc35892_devs), NULL,

			      tc35892->irq_base);

	if (ret) {

		dev_err(tc35892->dev, "failed to add children\n");

		goto out_freeirq;

	}



	return 0;



out_freeirq:

	free_irq(tc35892->i2c->irq, tc35892);

out_removeirq:

	tc35892_irq_remove(tc35892);

out_free:

	i2c_set_clientdata(i2c, NULL);

	kfree(tc35892);

	return ret;

}



static int __devexit tc35892_remove(struct i2c_client *client)

{

	struct tc35892 *tc35892 = i2c_get_clientdata(client);



	mfd_remove_devices(tc35892->dev);



	free_irq(tc35892->i2c->irq, tc35892);

	tc35892_irq_remove(tc35892);



	i2c_set_clientdata(client, NULL);

	kfree(tc35892);



	return 0;

}



static const struct i2c_device_id tc35892_id[] = {

	{ "tc35892", 24 },

	{ }

};

MODULE_DEVICE_TABLE(i2c, tc35892_id);



static struct i2c_driver tc35892_driver = {

	.driver.name	= "tc35892",

	.driver.owner	= THIS_MODULE,

	.probe		= tc35892_probe,

	.remove		= __devexit_p(tc35892_remove),

	.id_table	= tc35892_id,

};



static int __init tc35892_init(void)

{

	return i2c_add_driver(&tc35892_driver);

}

subsys_initcall(tc35892_init);



static void __exit tc35892_exit(void)

{

	i2c_del_driver(&tc35892_driver);

}

module_exit(tc35892_exit);



MODULE_LICENSE("GPL v2");

MODULE_DESCRIPTION("TC35892 MFD core driver");

MODULE_AUTHOR("Hanumath Prasad, Rabin Vincent");

include/linux/mfd/tc35892.h

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/*

 * Copyright (C) ST-Ericsson SA 2010

 *

 * License Terms: GNU General Public License, version 2

 */



#ifndef __LINUX_MFD_TC35892_H

#define __LINUX_MFD_TC35892_H



#include <linux/device.h>



#define TC35892_RSTCTRL_IRQRST	(1 << 4)

#define TC35892_RSTCTRL_TIMRST	(1 << 3)

#define TC35892_RSTCTRL_ROTRST	(1 << 2)

#define TC35892_RSTCTRL_KBDRST	(1 << 1)

#define TC35892_RSTCTRL_GPIRST	(1 << 0)



#define TC35892_IRQST		0x91



#define TC35892_MANFCODE_MAGIC	0x03

#define TC35892_MANFCODE	0x80

#define TC35892_VERSION		0x81

#define TC35892_IOCFG		0xA7



#define TC35892_CLKMODE		0x88

#define TC35892_CLKCFG		0x89

#define TC35892_CLKEN		0x8A



#define TC35892_RSTCTRL		0x82

#define TC35892_EXTRSTN		0x83

#define TC35892_RSTINTCLR	0x84



#define TC35892_GPIOIS0		0xC9

#define TC35892_GPIOIS1		0xCA

#define TC35892_GPIOIS2		0xCB

#define TC35892_GPIOIBE0	0xCC

#define TC35892_GPIOIBE1	0xCD

#define TC35892_GPIOIBE2	0xCE

#define TC35892_GPIOIEV0	0xCF

#define TC35892_GPIOIEV1	0xD0

#define TC35892_GPIOIEV2	0xD1

#define TC35892_GPIOIE0		0xD2

#define TC35892_GPIOIE1		0xD3

#define TC35892_GPIOIE2		0xD4

#define TC35892_GPIORIS0	0xD6

#define TC35892_GPIORIS1	0xD7

#define TC35892_GPIORIS2	0xD8

#define TC35892_GPIOMIS0	0xD9

#define TC35892_GPIOMIS1	0xDA

#define TC35892_GPIOMIS2	0xDB

#define TC35892_GPIOIC0		0xDC

#define TC35892_GPIOIC1		0xDD

#define TC35892_GPIOIC2		0xDE



#define TC35892_GPIODATA0	0xC0

#define TC35892_GPIOMASK0	0xc1

#define TC35892_GPIODATA1	0xC2

#define TC35892_GPIOMASK1	0xc3

#define TC35892_GPIODATA2	0xC4

#define TC35892_GPIOMASK2	0xC5



#define TC35892_GPIODIR0	0xC6

#define TC35892_GPIODIR1	0xC7

#define TC35892_GPIODIR2	0xC8



#define TC35892_GPIOSYNC0	0xE6

#define TC35892_GPIOSYNC1	0xE7

#define TC35892_GPIOSYNC2	0xE8



#define TC35892_GPIOWAKE0	0xE9

#define TC35892_GPIOWAKE1	0xEA

#define TC35892_GPIOWAKE2	0xEB



#define TC35892_GPIOODM0	0xE0

#define TC35892_GPIOODE0	0xE1

#define TC35892_GPIOODM1	0xE2

#define TC35892_GPIOODE1	0xE3

#define TC35892_GPIOODM2	0xE4

#define TC35892_GPIOODE2	0xE5



#define TC35892_INT_GPIIRQ	0

#define TC35892_INT_TI0IRQ	1

#define TC35892_INT_TI1IRQ	2

#define TC35892_INT_TI2IRQ	3

#define TC35892_INT_ROTIRQ	5

#define TC35892_INT_KBDIRQ	6

#define TC35892_INT_PORIRQ	7



#define TC35892_NR_INTERNAL_IRQS	8

#define TC35892_INT_GPIO(x)	(TC35892_NR_INTERNAL_IRQS + (x))



struct tc35892 {

	struct mutex lock;

	struct device *dev;

	struct i2c_client *i2c;



	int irq_base;

	int num_gpio;

	struct tc35892_platform_data *pdata;

};



extern int tc35892_reg_write(struct tc35892 *tc35892, u8 reg, u8 data);

extern int tc35892_reg_read(struct tc35892 *tc35892, u8 reg);

extern int tc35892_block_read(struct tc35892 *tc35892, u8 reg, u8 length,

			      u8 *values);

extern int tc35892_block_write(struct tc35892 *tc35892, u8 reg, u8 length,

			       const u8 *values);

extern int tc35892_set_bits(struct tc35892 *tc35892, u8 reg, u8 mask, u8 val);



/**

 * struct tc35892_gpio_platform_data - TC35892 GPIO platform data

 * @gpio_base: first gpio number assigned to TC35892.  A maximum of

 *	       %TC35892_NR_GPIOS GPIOs will be allocated.

 */

struct tc35892_gpio_platform_data {

	int gpio_base;

};



/**

 * struct tc35892_platform_data - TC35892 platform data

 * @irq_base: base IRQ number.  %TC35892_NR_IRQS irqs will be used.

 * @gpio: GPIO-specific platform data

 */

struct tc35892_platform_data {

	int irq_base;

	struct tc35892_gpio_platform_data *gpio;

};



#define TC35892_NR_GPIOS	24

#define TC35892_NR_IRQS		TC35892_INT_GPIO(TC35892_NR_GPIOS)



#endif