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