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kernel-ark/drivers/mfd/tc3589x.c
Mark Brown 0848c94fb4 mfd: core: Push irqdomain mapping out into devices 
Currently the MFD core supports remapping MFD cell interrupts using an
irqdomain but only if the MFD is being instantiated using device tree
and only if the device tree bindings use the pattern of registering IPs
in the device tree with compatible properties.  This will be actively
harmful for drivers which support non-DT platforms and use this pattern
for their DT bindings as it will mean that the core will silently change
remapping behaviour and it is also limiting for drivers which don't do
DT with this particular pattern.  There is also a potential fragility if
there are interrupts not associated with MFD cells and all the cells are
omitted from the device tree for some reason.

Instead change the code to take an IRQ domain as an optional argument,
allowing drivers to take the decision about the parent domain for their
interrupts.  The one current user of this feature is ab8500-core, it has
the domain lookup pushed out into the driver.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2012-09-15 23:22:04 +02:00

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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, NULL);
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, NULL);
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;
}
#ifdef CONFIG_PM_SLEEP
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;
}
#endif
static 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,
.driver.pm = &tc3589x_dev_pm_ops,
.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");
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