/*
* Core driver for HTC PASIC3 LED/DS1WM chip.
*
* Copyright (C) 2006 Philipp Zabel <philipp.zabel@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/ds1wm.h>
#include <linux/gpio.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/mfd/htc-pasic3.h>
struct pasic3_data {
void __iomem *mapping;
unsigned int bus_shift;
struct platform_device *ds1wm_pdev;
struct platform_device *led_pdev;
};
#define REG_ADDR 5
#define REG_DATA 6
#define READ_MODE 0x80
/*
* write to a secondary register on the PASIC3
*/
void pasic3_write_register(struct device *dev, u32 reg, u8 val)
{
struct pasic3_data *asic = dev->driver_data;
int bus_shift = asic->bus_shift;
void __iomem *addr = asic->mapping + (REG_ADDR << bus_shift);
void __iomem *data = asic->mapping + (REG_DATA << bus_shift);
__raw_writeb(~READ_MODE & reg, addr);
__raw_writeb(val, data);
}
EXPORT_SYMBOL(pasic3_write_register); /* for leds-pasic3 */
/*
* read from a secondary register on the PASIC3
*/
u8 pasic3_read_register(struct device *dev, u32 reg)
{
struct pasic3_data *asic = dev->driver_data;
int bus_shift = asic->bus_shift;
void __iomem *addr = asic->mapping + (REG_ADDR << bus_shift);
void __iomem *data = asic->mapping + (REG_DATA << bus_shift);
__raw_writeb(READ_MODE | reg, addr);
return __raw_readb(data);
}
EXPORT_SYMBOL(pasic3_read_register); /* for leds-pasic3 */
/*
* LEDs
*/
static int led_device_add(struct device *pasic3_dev,
const struct pasic3_leds_machinfo *pdata)
{
struct pasic3_data *asic = pasic3_dev->driver_data;
struct platform_device *pdev;
int ret;
pdev = platform_device_alloc("pasic3-led", -1);
if (!pdev) {
dev_dbg(pasic3_dev, "failed to allocate LED platform device\n");
return -ENOMEM;
}
ret = platform_device_add_data(pdev, pdata,
sizeof(struct pasic3_leds_machinfo));
if (ret < 0) {
dev_dbg(pasic3_dev, "failed to add LED platform data\n");
goto exit_pdev_put;
}
pdev->dev.parent = pasic3_dev;
ret = platform_device_add(pdev);
if (ret < 0) {
dev_dbg(pasic3_dev, "failed to add LED platform device\n");
goto exit_pdev_put;
}
asic->led_pdev = pdev;
return 0;
exit_pdev_put:
platform_device_put(pdev);
return ret;
}
/*
* DS1WM
*/
static void ds1wm_enable(struct platform_device *pdev)
{
struct device *dev = pdev->dev.parent;
int c;
c = pasic3_read_register(dev, 0x28);
pasic3_write_register(dev, 0x28, c & 0x7f);
dev_dbg(dev, "DS1WM OWM_EN low (active) %02x\n", c & 0x7f);
}
static void ds1wm_disable(struct platform_device *pdev)
{
struct device *dev = pdev->dev.parent;
int c;
c = pasic3_read_register(dev, 0x28);
pasic3_write_register(dev, 0x28, c | 0x80);
dev_dbg(dev, "DS1WM OWM_EN high (inactive) %02x\n", c | 0x80);
}
static struct ds1wm_platform_data ds1wm_pdata = {
.bus_shift = 2,
.enable = ds1wm_enable,
.disable = ds1wm_disable,
};
static int ds1wm_device_add(struct platform_device *pasic3_pdev, int bus_shift)
{
struct device *pasic3_dev = &pasic3_pdev->dev;
struct pasic3_data *asic = pasic3_dev->driver_data;
struct platform_device *pdev;
int ret;
pdev = platform_device_alloc("ds1wm", -1);
if (!pdev) {
dev_dbg(pasic3_dev, "failed to allocate DS1WM platform device\n");
return -ENOMEM;
}
ret = platform_device_add_resources(pdev, pasic3_pdev->resource,
pasic3_pdev->num_resources);
if (ret < 0) {
dev_dbg(pasic3_dev, "failed to add DS1WM resources\n");
goto exit_pdev_put;
}
ds1wm_pdata.bus_shift = asic->bus_shift;
ret = platform_device_add_data(pdev, &ds1wm_pdata,
sizeof(struct ds1wm_platform_data));
if (ret < 0) {
dev_dbg(pasic3_dev, "failed to add DS1WM platform data\n");
goto exit_pdev_put;
}
pdev->dev.parent = pasic3_dev;
ret = platform_device_add(pdev);
if (ret < 0) {
dev_dbg(pasic3_dev, "failed to add DS1WM platform device\n");
goto exit_pdev_put;
}
asic->ds1wm_pdev = pdev;
return 0;
exit_pdev_put:
platform_device_put(pdev);
return ret;
}
static int __init pasic3_probe(struct platform_device *pdev)
{
struct pasic3_platform_data *pdata = pdev->dev.platform_data;
struct device *dev = &pdev->dev;
struct pasic3_data *asic;
struct resource *r;
int ret;
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!r)
return -ENXIO;
if (!request_mem_region(r->start, r->end - r->start + 1, "pasic3"))
return -EBUSY;
asic = kzalloc(sizeof(struct pasic3_data), GFP_KERNEL);
if (!asic)
return -ENOMEM;
platform_set_drvdata(pdev, asic);
if (pdata && pdata->bus_shift)
asic->bus_shift = pdata->bus_shift;
else
asic->bus_shift = 2;
asic->mapping = ioremap(r->start, r->end - r->start + 1);
if (!asic->mapping) {
dev_err(dev, "couldn't ioremap PASIC3\n");
kfree(asic);
return -ENOMEM;
}
ret = ds1wm_device_add(pdev, asic->bus_shift);
if (ret < 0)
dev_warn(dev, "failed to register DS1WM\n");
if (pdata->led_pdata) {
ret = led_device_add(dev, pdata->led_pdata);
if (ret < 0)
dev_warn(dev, "failed to register LED device\n");
}
return 0;
}
static int pasic3_remove(struct platform_device *pdev)
{
struct pasic3_data *asic = platform_get_drvdata(pdev);
struct resource *r;
if (asic->led_pdev)
platform_device_unregister(asic->led_pdev);
if (asic->ds1wm_pdev)
platform_device_unregister(asic->ds1wm_pdev);
iounmap(asic->mapping);
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
release_mem_region(r->start, r->end - r->start + 1);
kfree(asic);
return 0;
}
static struct platform_driver pasic3_driver = {
.driver = {
.name = "pasic3",
},
.remove = pasic3_remove,
};
static int __init pasic3_base_init(void)
{
return platform_driver_probe(&pasic3_driver, pasic3_probe);
}
static void __exit pasic3_base_exit(void)
{
platform_driver_unregister(&pasic3_driver);
}
module_init(pasic3_base_init);
module_exit(pasic3_base_exit);
MODULE_AUTHOR("Philipp Zabel <philipp.zabel@gmail.com>");
MODULE_DESCRIPTION("Core driver for HTC PASIC3");
MODULE_LICENSE("GPL");
