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: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Rabin Vincent <rabin.vincent@stericsson.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Rabin Vincent 2010-05-10 23:39:47 +02:00 коммит произвёл Samuel Ortiz
Родитель 68e488d965
Коммит b4ecd326b7
4 изменённых файлов: 491 добавлений и 0 удалений

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@ -171,6 +171,17 @@ config TWL4030_CODEC
select MFD_CORE
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
bool
default n

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@ -15,6 +15,7 @@ obj-$(CONFIG_HTC_I2CPLD) += htc-i2cpld.o
obj-$(CONFIG_MFD_DAVINCI_VOICECODEC) += davinci_voicecodec.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_TC6387XB) += tc6387xb.o tmio_core.o
obj-$(CONFIG_MFD_TC6393XB) += tc6393xb.o tmio_core.o

347
drivers/mfd/tc35892.c Normal file
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@ -0,0 +1,347 @@
/*
* 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");

132
include/linux/mfd/tc35892.h Normal file
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@ -0,0 +1,132 @@
/*
* 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