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Commit 5dc3339a authored by Philipp Zabel's avatar Philipp Zabel Committed by Russell King
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[ARM] 4964/1: htc-pasic3: MFD driver for PASIC3 LED control + DS1WM chip 



This driver will provide registers, clocks and GPIOs of
the HTC PASIC3 (AIC3) and PASIC2 (AIC2) chips to the
ds1wm and leds-pasic3 drivers.

Signed-off-by: default avatarPhilipp Zabel <philipp.zabel@gmail.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 481ea5a1

drivers/mfd/Kconfig

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@@ -30,6 +30,14 @@ config HTC_EGPIO 
	    several HTC phones.  It provides basic support for input

	    pins, output pins, and irqs.



config HTC_PASIC3

	tristate "HTC PASIC3 LED/DS1WM chip support"

	help

	  This core driver provides register access for the LED/DS1WM

	  chips labeled "AIC2" and "AIC3", found on HTC Blueangel and

	  HTC Magician devices, respectively. Actual functionality is

	  handled by the leds-pasic3 and ds1wm drivers.



endmenu



menu "Multimedia Capabilities Port drivers"

drivers/mfd/Makefile

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@@ -6,6 +6,7 @@ obj-$(CONFIG_MFD_SM501) += sm501.o 
obj-$(CONFIG_MFD_ASIC3)		+= asic3.o



obj-$(CONFIG_HTC_EGPIO)		+= htc-egpio.o

obj-$(CONFIG_HTC_PASIC3)	+= htc-pasic3.o



obj-$(CONFIG_MCP)		+= mcp-core.o

obj-$(CONFIG_MCP_SA11X0)	+= mcp-sa11x0.o

drivers/mfd/htc-pasic3.c

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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/ds1wm.h>

#include <linux/gpio.h>

#include <linux/io.h>

#include <linux/irq.h>

#include <linux/interrupt.h>

#include <linux/mfd/htc-pasic3.h>



#include <asm/arch/pxa-regs.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 NUM_REGS  7



#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 device *pasic3_dev, int bus_shift)

{

	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, pdev->resource,

						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(dev, 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");

include/linux/mfd/htc-pasic3.h

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/*

 * HTC PASIC3 driver - LEDs and DS1WM

 *

 * Copyright (c) 2007 Philipp Zabel <philipp.zabel@gmail.com>

 *

 * This file is subject to the terms and conditions of the GNU General Public

 * License.  See the file COPYING in the main directory of this archive for

 * more details.

 *

 */



#ifndef __PASIC3_H

#define __PASIC3_H



#include <linux/platform_device.h>

#include <linux/leds.h>



extern void pasic3_write_register(struct device *dev, u32 reg, u8 val);

extern u8 pasic3_read_register(struct device *dev, u32 reg);



/*

 * mask for registers 0x20,0x21,0x22

 */

#define PASIC3_MASK_LED0 0x04

#define PASIC3_MASK_LED1 0x08

#define PASIC3_MASK_LED2 0x40



/*

 * bits in register 0x06

 */

#define PASIC3_BIT2_LED0 0x08

#define PASIC3_BIT2_LED1 0x10

#define PASIC3_BIT2_LED2 0x20



struct pasic3_led {

	struct led_classdev         led;

	unsigned int                hw_num;

	unsigned int                bit2;

	unsigned int                mask;

	struct pasic3_leds_machinfo *pdata;

};



struct pasic3_leds_machinfo {

	unsigned int      num_leds;

	unsigned int      power_gpio;

	struct pasic3_led *leds;

};



struct pasic3_platform_data {

	struct pasic3_leds_machinfo *led_pdata;

	unsigned int                 bus_shift;

	unsigned int                 clock_rate;

};



#endif