423 lines
9.3 KiB
C
423 lines
9.3 KiB
C
/*
|
|
* 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 (!tc3589x)
|
|
return -ENOMEM;
|
|
|
|
mutex_init(&tc3589x->lock);
|
|
|
|
tc3589x->dev = &i2c->dev;
|
|
tc3589x->i2c = i2c;
|
|
tc3589x->pdata = pdata;
|
|
tc3589x->irq_base = pdata->irq_base;
|
|
tc3589x->num_gpio = id->driver_data;
|
|
|
|
i2c_set_clientdata(i2c, tc3589x);
|
|
|
|
ret = tc3589x_chip_init(tc3589x);
|
|
if (ret)
|
|
goto out_free;
|
|
|
|
ret = tc3589x_irq_init(tc3589x);
|
|
if (ret)
|
|
goto out_free;
|
|
|
|
ret = request_threaded_irq(tc3589x->i2c->irq, NULL, tc3589x_irq,
|
|
IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
|
|
"tc3589x", tc3589x);
|
|
if (ret) {
|
|
dev_err(tc3589x->dev, "failed to request IRQ: %d\n", ret);
|
|
goto out_removeirq;
|
|
}
|
|
|
|
ret = tc3589x_device_init(tc3589x);
|
|
if (ret) {
|
|
dev_err(tc3589x->dev, "failed to add child devices\n");
|
|
goto out_freeirq;
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_freeirq:
|
|
free_irq(tc3589x->i2c->irq, tc3589x);
|
|
out_removeirq:
|
|
tc3589x_irq_remove(tc3589x);
|
|
out_free:
|
|
kfree(tc3589x);
|
|
return ret;
|
|
}
|
|
|
|
static int __devexit tc3589x_remove(struct i2c_client *client)
|
|
{
|
|
struct tc3589x *tc3589x = i2c_get_clientdata(client);
|
|
|
|
mfd_remove_devices(tc3589x->dev);
|
|
|
|
free_irq(tc3589x->i2c->irq, tc3589x);
|
|
tc3589x_irq_remove(tc3589x);
|
|
|
|
kfree(tc3589x);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int tc3589x_suspend(struct device *dev)
|
|
{
|
|
struct tc3589x *tc3589x = dev_get_drvdata(dev);
|
|
struct i2c_client *client = tc3589x->i2c;
|
|
int ret = 0;
|
|
|
|
/* put the system to sleep mode */
|
|
if (!device_may_wakeup(&client->dev))
|
|
ret = tc3589x_reg_write(tc3589x, TC3589x_CLKMODE,
|
|
TC3589x_CLKMODE_MODCTL_SLEEP);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int tc3589x_resume(struct device *dev)
|
|
{
|
|
struct tc3589x *tc3589x = dev_get_drvdata(dev);
|
|
struct i2c_client *client = tc3589x->i2c;
|
|
int ret = 0;
|
|
|
|
/* enable the system into operation */
|
|
if (!device_may_wakeup(&client->dev))
|
|
ret = tc3589x_reg_write(tc3589x, TC3589x_CLKMODE,
|
|
TC3589x_CLKMODE_MODCTL_OPERATION);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const SIMPLE_DEV_PM_OPS(tc3589x_dev_pm_ops, tc3589x_suspend,
|
|
tc3589x_resume);
|
|
|
|
static const struct i2c_device_id tc3589x_id[] = {
|
|
{ "tc3589x", 24 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, tc3589x_id);
|
|
|
|
static struct i2c_driver tc3589x_driver = {
|
|
.driver.name = "tc3589x",
|
|
.driver.owner = THIS_MODULE,
|
|
#ifdef CONFIG_PM
|
|
.driver.pm = &tc3589x_dev_pm_ops,
|
|
#endif
|
|
.probe = tc3589x_probe,
|
|
.remove = __devexit_p(tc3589x_remove),
|
|
.id_table = tc3589x_id,
|
|
};
|
|
|
|
static int __init tc3589x_init(void)
|
|
{
|
|
return i2c_add_driver(&tc3589x_driver);
|
|
}
|
|
subsys_initcall(tc3589x_init);
|
|
|
|
static void __exit tc3589x_exit(void)
|
|
{
|
|
i2c_del_driver(&tc3589x_driver);
|
|
}
|
|
module_exit(tc3589x_exit);
|
|
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_DESCRIPTION("TC3589x MFD core driver");
|
|
MODULE_AUTHOR("Hanumath Prasad, Rabin Vincent");
|