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/*
* Copyright (C) 2012-2014 Motorola Mobility LLC
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
* 02111-1307, USA
*/
#include <linux/gpio.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
struct mmi_factory_info {
int num_gpios;
struct gpio *list;
};
/* The driver should only be present when booting with the environment variable
* indicating factory-cable is present.
*/
static bool mmi_factory_cable_present(void)
{
struct device_node *np;
bool fact_cable;
np = of_find_node_by_path("/chosen");
fact_cable = of_property_read_bool(np, "mmi,factory-cable");
of_node_put(np);
if (!np || !fact_cable)
return false;
return true;
}
static struct mmi_factory_info *mmi_parse_of(struct platform_device *pdev)
{
struct mmi_factory_info *info;
int gpio_count;
struct device_node *np = pdev->dev.of_node;
int i;
enum of_gpio_flags flags;
if (!np) {
dev_err(&pdev->dev, "No OF DT node found.\n");
return NULL;
}
gpio_count = of_gpio_count(np);
if (!gpio_count) {
dev_err(&pdev->dev, "No GPIOS defined.\n");
return NULL;
}
/* Make sure number of GPIOs defined matches the supplied number of
* GPIO name strings.
*/
if (gpio_count != of_property_count_strings(np, "gpio-names")) {
dev_err(&pdev->dev, "GPIO info and name mismatch\n");
return NULL;
}
info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
if (!info)
return NULL;
info->list = devm_kzalloc(&pdev->dev,
sizeof(struct gpio) * gpio_count,
GFP_KERNEL);
if (!info->list)
return NULL;
info->num_gpios = gpio_count;
for (i = 0; i < gpio_count; i++) {
info->list[i].gpio = of_get_gpio_flags(np, i, &flags);
info->list[i].flags = flags;
of_property_read_string_index(np, "gpio-names", i,
&info->list[i].label);
dev_dbg(&pdev->dev, "GPIO: %d FLAGS: %ld LABEL: %s\n",
info->list[i].gpio, info->list[i].flags,
info->list[i].label);
}
return info;
}
static int mmi_factory_probe(struct platform_device *pdev)
{
struct mmi_factory_info *info;
int ret;
int i;
if (!mmi_factory_cable_present()) {
dev_dbg(&pdev->dev, "factory cable not present\n");
return -ENODEV;
}
info = mmi_parse_of(pdev);
if (!info) {
dev_err(&pdev->dev, "failed to parse node\n");
return -ENODEV;
}
ret = gpio_request_array(info->list, info->num_gpios);
if (ret) {
dev_err(&pdev->dev, "failed to request GPIOs\n");
return ret;
}
for (i = 0; i < info->num_gpios; i++) {
ret = gpio_export(info->list[i].gpio, 1);
if (ret) {
dev_err(&pdev->dev, "Failed to export GPIO %s: %d\n",
info->list[i].label, info->list[i].gpio);
goto fail;
}
ret = gpio_export_link(&pdev->dev, info->list[i].label,
info->list[i].gpio);
if (ret) {
dev_err(&pdev->dev, "Failed to link GPIO %s: %d\n",
info->list[i].label, info->list[i].gpio);
goto fail;
}
}
platform_set_drvdata(pdev, info);
return 0;
fail:
gpio_free_array(info->list, info->num_gpios);
return ret;
}
static int mmi_factory_remove(struct platform_device *pdev)
{
struct mmi_factory_info *info = platform_get_drvdata(pdev);
if (info)
gpio_free_array(info->list, info->num_gpios);
return 0;
}
static const struct of_device_id mmi_factory_of_tbl[] = {
{ .compatible = "mmi,factory-support", },
{ },
};
MODULE_DEVICE_TABLE(of, mmi_factory_of_tbl);
static struct platform_driver mmi_factory_driver = {
.probe = mmi_factory_probe,
.remove = mmi_factory_remove,
.driver = {
.name = "mmi_factory",
.owner = THIS_MODULE,
.of_match_table = mmi_factory_of_tbl,
},
};
static int __init mmi_factory_init(void)
{
return platform_driver_register(&mmi_factory_driver);
}
static void __exit mmi_factory_exit(void)
{
platform_driver_unregister(&mmi_factory_driver);
}
module_init(mmi_factory_init);
module_exit(mmi_factory_exit);
MODULE_ALIAS("platform:mmi_factory");
MODULE_AUTHOR("Motorola Mobility LLC");
MODULE_DESCRIPTION("Motorola Mobility Factory Specific Controls");
MODULE_LICENSE("GPL");
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