linux/drivers/mfd/ucb1400_core.c
Uwe Kleine-König 7e55b33d3f gpio: ucb1400: Remove platform setup and teardown support
There is no user of these callbacks. The motivation for this change is
to stop returning an error code from the remove callback.

This is a preparation for making platform remove callbacks return void.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
2022-07-19 09:56:51 +02:00

159 lines
3.4 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* Core functions for:
* Philips UCB1400 multifunction chip
*
* Based on ucb1400_ts.c:
* Author: Nicolas Pitre
* Created: September 25, 2006
* Copyright: MontaVista Software, Inc.
*
* Spliting done by: Marek Vasut <marek.vasut@gmail.com>
* If something doesn't work and it worked before spliting, e-mail me,
* dont bother Nicolas please ;-)
*
* This code is heavily based on ucb1x00-*.c copyrighted by Russell King
* covering the UCB1100, UCB1200 and UCB1300.. Support for the UCB1400 has
* been made separate from ucb1x00-core/ucb1x00-ts on Russell's request.
*/
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/ucb1400.h>
unsigned int ucb1400_adc_read(struct snd_ac97 *ac97, u16 adc_channel,
int adcsync)
{
unsigned int val;
if (adcsync)
adc_channel |= UCB_ADC_SYNC_ENA;
ucb1400_reg_write(ac97, UCB_ADC_CR, UCB_ADC_ENA | adc_channel);
ucb1400_reg_write(ac97, UCB_ADC_CR, UCB_ADC_ENA | adc_channel |
UCB_ADC_START);
while (!((val = ucb1400_reg_read(ac97, UCB_ADC_DATA))
& UCB_ADC_DAT_VALID))
schedule_timeout_uninterruptible(1);
return val & UCB_ADC_DAT_MASK;
}
EXPORT_SYMBOL_GPL(ucb1400_adc_read);
static int ucb1400_core_probe(struct device *dev)
{
int err;
struct ucb1400 *ucb;
struct ucb1400_ts ucb_ts;
struct ucb1400_gpio ucb_gpio;
struct snd_ac97 *ac97;
struct ucb1400_pdata *pdata = dev_get_platdata(dev);
memset(&ucb_ts, 0, sizeof(ucb_ts));
memset(&ucb_gpio, 0, sizeof(ucb_gpio));
ucb = kzalloc(sizeof(struct ucb1400), GFP_KERNEL);
if (!ucb) {
err = -ENOMEM;
goto err;
}
dev_set_drvdata(dev, ucb);
ac97 = to_ac97_t(dev);
ucb_ts.id = ucb1400_reg_read(ac97, UCB_ID);
if (ucb_ts.id != UCB_ID_1400) {
err = -ENODEV;
goto err0;
}
/* GPIO */
ucb_gpio.ac97 = ac97;
if (pdata)
ucb_gpio.gpio_offset = pdata->gpio_offset;
ucb->ucb1400_gpio = platform_device_alloc("ucb1400_gpio", -1);
if (!ucb->ucb1400_gpio) {
err = -ENOMEM;
goto err0;
}
err = platform_device_add_data(ucb->ucb1400_gpio, &ucb_gpio,
sizeof(ucb_gpio));
if (err)
goto err1;
err = platform_device_add(ucb->ucb1400_gpio);
if (err)
goto err1;
/* TOUCHSCREEN */
ucb_ts.ac97 = ac97;
if (pdata != NULL && pdata->irq >= 0)
ucb_ts.irq = pdata->irq;
else
ucb_ts.irq = -1;
ucb->ucb1400_ts = platform_device_alloc("ucb1400_ts", -1);
if (!ucb->ucb1400_ts) {
err = -ENOMEM;
goto err2;
}
err = platform_device_add_data(ucb->ucb1400_ts, &ucb_ts,
sizeof(ucb_ts));
if (err)
goto err3;
err = platform_device_add(ucb->ucb1400_ts);
if (err)
goto err3;
return 0;
err3:
platform_device_put(ucb->ucb1400_ts);
err2:
platform_device_del(ucb->ucb1400_gpio);
err1:
platform_device_put(ucb->ucb1400_gpio);
err0:
kfree(ucb);
err:
return err;
}
static int ucb1400_core_remove(struct device *dev)
{
struct ucb1400 *ucb = dev_get_drvdata(dev);
platform_device_unregister(ucb->ucb1400_ts);
platform_device_unregister(ucb->ucb1400_gpio);
kfree(ucb);
return 0;
}
static struct device_driver ucb1400_core_driver = {
.name = "ucb1400_core",
.bus = &ac97_bus_type,
.probe = ucb1400_core_probe,
.remove = ucb1400_core_remove,
};
static int __init ucb1400_core_init(void)
{
return driver_register(&ucb1400_core_driver);
}
static void __exit ucb1400_core_exit(void)
{
driver_unregister(&ucb1400_core_driver);
}
module_init(ucb1400_core_init);
module_exit(ucb1400_core_exit);
MODULE_DESCRIPTION("Philips UCB1400 driver");
MODULE_LICENSE("GPL");