linux/drivers/mfd/tps6105x.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

248 lines
5.6 KiB
C

/*
* Core driver for TPS61050/61052 boost converters, used for while LED
* driving, audio power amplification, white LED flash, and generic
* boost conversion. Additionally it provides a 1-bit GPIO pin (out or in)
* and a flash synchronization pin to synchronize flash events when used as
* flashgun.
*
* Copyright (C) 2011 ST-Ericsson SA
* Written on behalf of Linaro for ST-Ericsson
*
* Author: Linus Walleij <linus.walleij@linaro.org>
*
* License terms: GNU General Public License (GPL) version 2
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/mutex.h>
#include <linux/gpio.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/regulator/driver.h>
#include <linux/mfd/core.h>
#include <linux/mfd/tps6105x.h>
int tps6105x_set(struct tps6105x *tps6105x, u8 reg, u8 value)
{
int ret;
ret = mutex_lock_interruptible(&tps6105x->lock);
if (ret)
return ret;
ret = i2c_smbus_write_byte_data(tps6105x->client, reg, value);
mutex_unlock(&tps6105x->lock);
if (ret < 0)
return ret;
return 0;
}
EXPORT_SYMBOL(tps6105x_set);
int tps6105x_get(struct tps6105x *tps6105x, u8 reg, u8 *buf)
{
int ret;
ret = mutex_lock_interruptible(&tps6105x->lock);
if (ret)
return ret;
ret = i2c_smbus_read_byte_data(tps6105x->client, reg);
mutex_unlock(&tps6105x->lock);
if (ret < 0)
return ret;
*buf = ret;
return 0;
}
EXPORT_SYMBOL(tps6105x_get);
/*
* Masks off the bits in the mask and sets the bits in the bitvalues
* parameter in one atomic operation
*/
int tps6105x_mask_and_set(struct tps6105x *tps6105x, u8 reg,
u8 bitmask, u8 bitvalues)
{
int ret;
u8 regval;
ret = mutex_lock_interruptible(&tps6105x->lock);
if (ret)
return ret;
ret = i2c_smbus_read_byte_data(tps6105x->client, reg);
if (ret < 0)
goto fail;
regval = ret;
regval = (~bitmask & regval) | (bitmask & bitvalues);
ret = i2c_smbus_write_byte_data(tps6105x->client, reg, regval);
fail:
mutex_unlock(&tps6105x->lock);
if (ret < 0)
return ret;
return 0;
}
EXPORT_SYMBOL(tps6105x_mask_and_set);
static int __devinit tps6105x_startup(struct tps6105x *tps6105x)
{
int ret;
u8 regval;
ret = tps6105x_get(tps6105x, TPS6105X_REG_0, &regval);
if (ret)
return ret;
switch (regval >> TPS6105X_REG0_MODE_SHIFT) {
case TPS6105X_REG0_MODE_SHUTDOWN:
dev_info(&tps6105x->client->dev,
"TPS6105x found in SHUTDOWN mode\n");
break;
case TPS6105X_REG0_MODE_TORCH:
dev_info(&tps6105x->client->dev,
"TPS6105x found in TORCH mode\n");
break;
case TPS6105X_REG0_MODE_TORCH_FLASH:
dev_info(&tps6105x->client->dev,
"TPS6105x found in FLASH mode\n");
break;
case TPS6105X_REG0_MODE_VOLTAGE:
dev_info(&tps6105x->client->dev,
"TPS6105x found in VOLTAGE mode\n");
break;
default:
break;
}
return ret;
}
/*
* MFD cells - we have one cell which is selected operation
* mode, and we always have a GPIO cell.
*/
static struct mfd_cell tps6105x_cells[] = {
{
/* name will be runtime assigned */
.id = -1,
},
{
.name = "tps6105x-gpio",
.id = -1,
},
};
static int __devinit tps6105x_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct tps6105x *tps6105x;
struct tps6105x_platform_data *pdata;
int ret;
int i;
tps6105x = kmalloc(sizeof(*tps6105x), GFP_KERNEL);
if (!tps6105x)
return -ENOMEM;
i2c_set_clientdata(client, tps6105x);
tps6105x->client = client;
pdata = client->dev.platform_data;
tps6105x->pdata = pdata;
mutex_init(&tps6105x->lock);
ret = tps6105x_startup(tps6105x);
if (ret) {
dev_err(&client->dev, "chip initialization failed\n");
goto fail;
}
/* Remove warning texts when you implement new cell drivers */
switch (pdata->mode) {
case TPS6105X_MODE_SHUTDOWN:
dev_info(&client->dev,
"present, not used for anything, only GPIO\n");
break;
case TPS6105X_MODE_TORCH:
tps6105x_cells[0].name = "tps6105x-leds";
dev_warn(&client->dev,
"torch mode is unsupported\n");
break;
case TPS6105X_MODE_TORCH_FLASH:
tps6105x_cells[0].name = "tps6105x-flash";
dev_warn(&client->dev,
"flash mode is unsupported\n");
break;
case TPS6105X_MODE_VOLTAGE:
tps6105x_cells[0].name ="tps6105x-regulator";
break;
default:
break;
}
/* Set up and register the platform devices. */
for (i = 0; i < ARRAY_SIZE(tps6105x_cells); i++) {
/* One state holder for all drivers, this is simple */
tps6105x_cells[i].platform_data = tps6105x;
tps6105x_cells[i].pdata_size = sizeof(*tps6105x);
}
ret = mfd_add_devices(&client->dev, 0, tps6105x_cells,
ARRAY_SIZE(tps6105x_cells), NULL, 0, NULL);
if (ret)
goto fail;
return 0;
fail:
kfree(tps6105x);
return ret;
}
static int __devexit tps6105x_remove(struct i2c_client *client)
{
struct tps6105x *tps6105x = i2c_get_clientdata(client);
mfd_remove_devices(&client->dev);
/* Put chip in shutdown mode */
tps6105x_mask_and_set(tps6105x, TPS6105X_REG_0,
TPS6105X_REG0_MODE_MASK,
TPS6105X_MODE_SHUTDOWN << TPS6105X_REG0_MODE_SHIFT);
kfree(tps6105x);
return 0;
}
static const struct i2c_device_id tps6105x_id[] = {
{ "tps61050", 0 },
{ "tps61052", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, tps6105x_id);
static struct i2c_driver tps6105x_driver = {
.driver = {
.name = "tps6105x",
},
.probe = tps6105x_probe,
.remove = __devexit_p(tps6105x_remove),
.id_table = tps6105x_id,
};
static int __init tps6105x_init(void)
{
return i2c_add_driver(&tps6105x_driver);
}
subsys_initcall(tps6105x_init);
static void __exit tps6105x_exit(void)
{
i2c_del_driver(&tps6105x_driver);
}
module_exit(tps6105x_exit);
MODULE_AUTHOR("Linus Walleij");
MODULE_DESCRIPTION("TPS6105x White LED Boost Converter Driver");
MODULE_LICENSE("GPL v2");