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/*
* 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/gpio.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/mfd/core.h>
#include <linux/mfd/ds1wm.h>
#include <linux/mfd/htc-pasic3.h>
#include <linux/slab.h>
struct pasic3_data {
void __iomem *mapping;
unsigned int bus_shift;
};
#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_get_drvdata(dev);
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_get_drvdata(dev);
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 struct mfd_cell led_cell __initdata = {
.name = "leds-pasic3",
};
/*
* DS1WM
*/
static int 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);
return 0;
}
static int 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);
return 0;
}
static struct ds1wm_driver_data ds1wm_pdata = {
.active_high = 0,
};
static struct resource ds1wm_resources[] __initdata = {
[0] = {
.start = 0,
.flags = IORESOURCE_MEM,
},
[1] = {
.start = 0,
.end = 0,
.flags = IORESOURCE_IRQ,
},
};
static struct mfd_cell ds1wm_cell __initdata = {
.name = "ds1wm",
.enable = ds1wm_enable,
.disable = ds1wm_disable,
.platform_data = &ds1wm_pdata,
.pdata_size = sizeof(ds1wm_pdata),
.num_resources = 2,
.resources = ds1wm_resources,
};
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;
int irq = 0;
r = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
if (r) {
ds1wm_resources[1].flags = IORESOURCE_IRQ | (r->flags &
(IORESOURCE_IRQ_HIGHEDGE | IORESOURCE_IRQ_LOWEDGE));
irq = r->start;
}
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!r)
return -ENXIO;
if (!request_mem_region(r->start, resource_size(r), "pasic3"))
return -EBUSY;
asic = kzalloc(sizeof(struct pasic3_data), GFP_KERNEL);
if (!asic)
return -ENOMEM;
platform_set_drvdata(pdev, asic);
asic->mapping = ioremap(r->start, resource_size(r));
if (!asic->mapping) {
dev_err(dev, "couldn't ioremap PASIC3\n");
kfree(asic);
return -ENOMEM;
}
/* calculate bus shift from mem resource */
asic->bus_shift = (resource_size(r) - 5) >> 3;
if (pdata && pdata->clock_rate) {
ds1wm_pdata.clock_rate = pdata->clock_rate;
/* the first 5 PASIC3 registers control the DS1WM */
ds1wm_resources[0].end = (5 << asic->bus_shift) - 1;
ret = mfd_add_devices(&pdev->dev, pdev->id,
&ds1wm_cell, 1, r, irq);
if (ret < 0)
dev_warn(dev, "failed to register DS1WM\n");
}
if (pdata && pdata->led_pdata) {
ret = mfd_add_devices(&pdev->dev, pdev->id, &led_cell, 1, r, 0);
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;
mfd_remove_devices(&pdev->dev);
iounmap(asic->mapping);
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
release_mem_region(r->start, resource_size(r));
kfree(asic);
return 0;
}
MODULE_ALIAS("platform:pasic3");
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");
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