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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>
 
 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;
}

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");