OMAP2+: GPIO: device registration

/*

 * OMAP2+ specific gpio initialization

 *

 * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/

 *

 * Author:

 *	Charulatha V <charu@ti.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.

 *

 * This program is distributed "as is" WITHOUT ANY WARRANTY of any

 * kind, whether express or implied; without even the implied warranty

 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 */

#include <linux/gpio.h>

#include <linux/err.h>

#include <linux/slab.h>

#include <linux/interrupt.h>

#include <plat/omap_hwmod.h>

#include <plat/omap_device.h>

static struct omap_device_pm_latency omap_gpio_latency[] = {

	[0] = {

		.deactivate_func = omap_device_idle_hwmods,

		.activate_func   = omap_device_enable_hwmods,

		.flags		 = OMAP_DEVICE_LATENCY_AUTO_ADJUST,

	},

};

static int omap2_gpio_dev_init(struct omap_hwmod *oh, void *unused)

{

	struct omap_device *od;

	struct omap_gpio_platform_data *pdata;

	struct omap_gpio_dev_attr *dev_attr;

	char *name = "omap_gpio";

	int id;

	/*

	 * extract the device id from name field available in the

	 * hwmod database and use the same for constructing ids for

	 * gpio devices.

	 * CAUTION: Make sure the name in the hwmod database does

	 * not change. If changed, make corresponding change here

	 * or make use of static variable mechanism to handle this.

	 */

	sscanf(oh->name, "gpio%d", &id);

	pdata = kzalloc(sizeof(struct omap_gpio_platform_data), GFP_KERNEL);

	if (!pdata) {

		pr_err("gpio%d: Memory allocation failed\n", id);

		return -ENOMEM;

	}

	dev_attr = (struct omap_gpio_dev_attr *)oh->dev_attr;

	pdata->bank_width = dev_attr->bank_width;

	pdata->dbck_flag = dev_attr->dbck_flag;

	pdata->virtual_irq_start = IH_GPIO_BASE + 32 * (id - 1);

	switch (oh->class->rev) {

	case 0:

	case 1:

		pdata->bank_type = METHOD_GPIO_24XX;

		break;

	case 2:

		pdata->bank_type = METHOD_GPIO_44XX;

		break;

	default:

		WARN(1, "Invalid gpio bank_type\n");

		kfree(pdata);

		return -EINVAL;

	}

	od = omap_device_build(name, id - 1, oh, pdata,

				sizeof(*pdata),	omap_gpio_latency,

				ARRAY_SIZE(omap_gpio_latency),

				false);

	kfree(pdata);

	if (IS_ERR(od)) {

		WARN(1, "Cant build omap_device for %s:%s.\n",

					name, oh->name);

		return PTR_ERR(od);

	}

	gpio_bank_count++;

	return 0;

}

/*

 * gpio_init needs to be done before

 * machine_init functions access gpio APIs.

 * Hence gpio_init is a postcore_initcall.

 */

static int __init omap2_gpio_init(void)

{

	return omap_hwmod_for_each_by_class("gpio", omap2_gpio_dev_init,

						NULL);

}

postcore_initcall(omap2_gpio_init);