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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/tc3589x.h>
#define TC3589x_CLKMODE_MODCTL_SLEEP 0x0
#define TC3589x_CLKMODE_MODCTL_OPERATION (1 << 0)
/**
* tc3589x_reg_read() - read a single TC3589x register
* @tc3589x: Device to read from
* @reg: Register to read
*/
int tc3589x_reg_read(struct tc3589x *tc3589x, u8 reg)
{
int ret;
ret = i2c_smbus_read_byte_data(tc3589x->i2c, reg);
if (ret < 0)
dev_err(tc3589x->dev, "failed to read reg %#x: %d\n",
reg, ret);
return ret;
}
EXPORT_SYMBOL_GPL(tc3589x_reg_read);
/**
* tc3589x_reg_read() - write a single TC3589x register
* @tc3589x: Device to write to
* @reg: Register to read
* @data: Value to write
*/
int tc3589x_reg_write(struct tc3589x *tc3589x, u8 reg, u8 data)
{
int ret;
ret = i2c_smbus_write_byte_data(tc3589x->i2c, reg, data);
if (ret < 0)
dev_err(tc3589x->dev, "failed to write reg %#x: %d\n",
reg, ret);
return ret;
}
EXPORT_SYMBOL_GPL(tc3589x_reg_write);
/**
* tc3589x_block_read() - read multiple TC3589x registers
* @tc3589x: Device to read from
* @reg: First register
* @length: Number of registers
* @values: Buffer to write to
*/
int tc3589x_block_read(struct tc3589x *tc3589x, u8 reg, u8 length, u8 *values)
{
int ret;
ret = i2c_smbus_read_i2c_block_data(tc3589x->i2c, reg, length, values);
if (ret < 0)
dev_err(tc3589x->dev, "failed to read regs %#x: %d\n",
reg, ret);
return ret;
}
EXPORT_SYMBOL_GPL(tc3589x_block_read);
/**
* tc3589x_block_write() - write multiple TC3589x registers
* @tc3589x: Device to write to
* @reg: First register
* @length: Number of registers
* @values: Values to write
*/
int tc3589x_block_write(struct tc3589x *tc3589x, u8 reg, u8 length,
const u8 *values)
{
int ret;
ret = i2c_smbus_write_i2c_block_data(tc3589x->i2c, reg, length,
values);
if (ret < 0)
dev_err(tc3589x->dev, "failed to write regs %#x: %d\n",
reg, ret);
return ret;
}
EXPORT_SYMBOL_GPL(tc3589x_block_write);
/**
* tc3589x_set_bits() - set the value of a bitfield in a TC3589x register
* @tc3589x: Device to write to
* @reg: Register to write
* @mask: Mask of bits to set
* @values: Value to set
*/
int tc3589x_set_bits(struct tc3589x *tc3589x, u8 reg, u8 mask, u8 val)
{
int ret;
mutex_lock(&tc3589x->lock);
ret = tc3589x_reg_read(tc3589x, reg);
if (ret < 0)
goto out;
ret &= ~mask;
ret |= val;
ret = tc3589x_reg_write(tc3589x, reg, ret);
out:
mutex_unlock(&tc3589x->lock);
return ret;
}
EXPORT_SYMBOL_GPL(tc3589x_set_bits);
static struct resource gpio_resources[] = {
{
.start = TC3589x_INT_GPIIRQ,
.end = TC3589x_INT_GPIIRQ,
.flags = IORESOURCE_IRQ,
},
};
static struct resource keypad_resources[] = {
{
.start = TC3589x_INT_KBDIRQ,
.end = TC3589x_INT_KBDIRQ,
.flags = IORESOURCE_IRQ,
},
};
static struct mfd_cell tc3589x_dev_gpio[] = {
{
.name = "tc3589x-gpio",
.num_resources = ARRAY_SIZE(gpio_resources),
.resources = &gpio_resources[0],
},
};
static struct mfd_cell tc3589x_dev_keypad[] = {
{
.name = "tc3589x-keypad",
.num_resources = ARRAY_SIZE(keypad_resources),
.resources = &keypad_resources[0],
},
};
static irqreturn_t tc3589x_irq(int irq, void *data)
{
struct tc3589x *tc3589x = data;
int status;
again:
status = tc3589x_reg_read(tc3589x, TC3589x_IRQST);
if (status < 0)
return IRQ_NONE;
while (status) {
int bit = __ffs(status);
handle_nested_irq(tc3589x->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. In such a case, recheck for any interrupt which is still
* pending.
*/
status = tc3589x_reg_read(tc3589x, TC3589x_IRQST);
if (status)
goto again;
return IRQ_HANDLED;
}
static int tc3589x_irq_init(struct tc3589x *tc3589x)
{
int base = tc3589x->irq_base;
int irq;
for (irq = base; irq < base + TC3589x_NR_INTERNAL_IRQS; irq++) {
irq_set_chip_data(irq, tc3589x);
irq_set_chip_and_handler(irq, &dummy_irq_chip,
handle_edge_irq);
irq_set_nested_thread(irq, 1);
#ifdef CONFIG_ARM
set_irq_flags(irq, IRQF_VALID);
#else
irq_set_noprobe(irq);
#endif
}
return 0;
}
static void tc3589x_irq_remove(struct tc3589x *tc3589x)
{
int base = tc3589x->irq_base;
int irq;
for (irq = base; irq < base + TC3589x_NR_INTERNAL_IRQS; irq++) {
#ifdef CONFIG_ARM
set_irq_flags(irq, 0);
#endif
irq_set_chip_and_handler(irq, NULL, NULL);
irq_set_chip_data(irq, NULL);
}
}
static int tc3589x_chip_init(struct tc3589x *tc3589x)
{
int manf, ver, ret;
manf = tc3589x_reg_read(tc3589x, TC3589x_MANFCODE);
if (manf < 0)
return manf;
ver = tc3589x_reg_read(tc3589x, TC3589x_VERSION);
if (ver < 0)
return ver;
if (manf != TC3589x_MANFCODE_MAGIC) {
dev_err(tc3589x->dev, "unknown manufacturer: %#x\n", manf);
return -EINVAL;
}
dev_info(tc3589x->dev, "manufacturer: %#x, version: %#x\n", manf, ver);
/*
* Put everything except the IRQ module into reset;
* also spare the GPIO module for any pin initialization
* done during pre-kernel boot
*/
ret = tc3589x_reg_write(tc3589x, TC3589x_RSTCTRL,
TC3589x_RSTCTRL_TIMRST
| TC3589x_RSTCTRL_ROTRST
| TC3589x_RSTCTRL_KBDRST);
if (ret < 0)
return ret;
/* Clear the reset interrupt. */
return tc3589x_reg_write(tc3589x, TC3589x_RSTINTCLR, 0x1);
}
static int __devinit tc3589x_device_init(struct tc3589x *tc3589x)
{
int ret = 0;
unsigned int blocks = tc3589x->pdata->block;
if (blocks & TC3589x_BLOCK_GPIO) {
ret = mfd_add_devices(tc3589x->dev, -1, tc3589x_dev_gpio,
ARRAY_SIZE(tc3589x_dev_gpio), NULL,
tc3589x->irq_base);
if (ret) {
dev_err(tc3589x->dev, "failed to add gpio child\n");
return ret;
}
dev_info(tc3589x->dev, "added gpio block\n");
}
if (blocks & TC3589x_BLOCK_KEYPAD) {
ret = mfd_add_devices(tc3589x->dev, -1, tc3589x_dev_keypad,
ARRAY_SIZE(tc3589x_dev_keypad), NULL,
tc3589x->irq_base);
if (ret) {
dev_err(tc3589x->dev, "failed to keypad child\n");
return ret;
}
dev_info(tc3589x->dev, "added keypad block\n");
}
return ret;
}
static int __devinit tc3589x_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
struct tc3589x_platform_data *pdata = i2c->dev.platform_data;
struct tc3589x *tc3589x;
int ret;
if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA
| I2C_FUNC_SMBUS_I2C_BLOCK))
return -EIO;
tc3589x = kzalloc(sizeof(struct tc3589x), GFP_KERNEL);
if (!
|