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/*
* Copyright (C) 2012 Motorola, Inc.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* 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.
*/
#include <linux/c55_ctrl.h>
#include <linux/err.h>
#include <linux/gpio.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/wakelock.h>
struct c55_ctrl_data {
struct c55_ctrl_platform_data *pdata;
int int_gpio;
struct wake_lock wake_lock;
};
static irqreturn_t c55_ctrl_isr(int irq, void *data)
{
struct c55_ctrl_data *cdata = data;
pr_debug("%s: value=%d\n", __func__, gpio_get_value(cdata->int_gpio));
/* Interrupt is active low */
if (gpio_get_value(cdata->int_gpio) == 0)
wake_lock(&cdata->wake_lock);
else
wake_unlock(&cdata->wake_lock);
return IRQ_HANDLED;
}
static void c55_ctrl_int_setup(struct c55_ctrl_data *cdata, int gpio)
{
int ret;
int irq = gpio_to_irq(gpio);
unsigned int flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING;
if (cdata->int_gpio) {
/* Interrupt already registered */
return;
}
pr_debug("%s: Requesting IRQ %d\n", __func__, irq);
/* Interrupt is shared with user space */
flags |= IRQF_SHARED;
ret = request_threaded_irq(irq, NULL, c55_ctrl_isr,
flags, "c55_ctrl", cdata);
if (ret) {
pr_err("%s: IRQ request failed: %d\n", __func__, ret);
return;
}
enable_irq_wake(irq);
cdata->int_gpio = gpio;
}
static int c55_ctrl_gpio_setup(struct c55_ctrl_data *cdata, struct device *dev)
{
int i;
int ret;
struct gpio *gpios = cdata->pdata->gpios;
int num_gpios = cdata->pdata->num_gpios;
ret = gpio_request_array(gpios, num_gpios);
if (ret) {
pr_err("%s: GPIO requests failed: %d\n", __func__, ret);
return ret;
}
for (i = 0; i < num_gpios; ++i) {
pr_debug("%s: Exporting %s (GPIO %d)\n",
__func__, gpios[i].label, gpios[i].gpio);
gpio_export(gpios[i].gpio, false);
gpio_export_link(dev, gpios[i].label, gpios[i].gpio);
if ((gpios[i].flags & GPIOF_IN) == GPIOF_IN)
c55_ctrl_int_setup(cdata, gpios[i].gpio);
}
return 0;
}
static int __devinit c55_ctrl_probe(struct platform_device *pdev)
{
struct c55_ctrl_data *cdata;
struct c55_ctrl_platform_data *pdata;
int ret;
pdata = pdev->dev.platform_data;
if (!pdata) {
pr_err("%s: Missing platform data!\n", __func__);
return -EINVAL;
}
cdata = kzalloc(sizeof(*cdata), GFP_KERNEL);
if (cdata == NULL) {
pr_err("%s: No memory!\n", __func__);
return -ENOMEM;
}
cdata->pdata = pdata;
wake_lock_init(&cdata->wake_lock, WAKE_LOCK_SUSPEND, "c55_ctrl");
ret = c55_ctrl_gpio_setup(cdata, &pdev->dev);
if (ret)
goto err;
if (pdata->adc_clk_en)
pdata->adc_clk_en(1);
platform_set_drvdata(pdev, cdata);
return 0;
err:
wake_lock_destroy(&cdata->wake_lock);
kfree(cdata);
return ret;
}
static int __devexit c55_ctrl_remove(struct platform_device *pdev)
{
struct c55_ctrl_data *cdata = platform_get_drvdata(pdev);
if (cdata->pdata->adc_clk_en)
cdata->pdata->adc_clk_en(0);
if (cdata->int_gpio)
free_irq(gpio_to_irq(cdata->int_gpio), cdata);
gpio_free_array(cdata->pdata->gpios, cdata->pdata->num_gpios);
wake_lock_destroy(&cdata->wake_lock);
kfree(cdata);
return 0;
}
static struct platform_driver c55_ctrl_driver = {
.driver = {
.name = "c55_ctrl",
},
.probe = c55_ctrl_probe,
.remove = __devexit_p(c55_ctrl_remove),
};
static int __init c55_ctrl_init(void)
{
return platform_driver_register(&c55_ctrl_driver);
}
static void __exit c55_ctrl_exit(void)
{
platform_driver_unregister(&c55_ctrl_driver);
}
module_init(c55_ctrl_init);
module_exit(c55_ctrl_exit);
MODULE_ALIAS("platform:c55_ctrl");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Motorola");
MODULE_DESCRIPTION("TI C55 control driver");
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