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Ole André Vadla Ravnås
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169c65d57e
51358 changed files with 23120455 additions and 0 deletions
225
drivers/pps/clients/pps-gpio.c
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225
drivers/pps/clients/pps-gpio.c
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/*
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* pps-gpio.c -- PPS client driver using GPIO
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*
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*
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* Copyright (C) 2010 Ricardo Martins <rasm@fe.up.pt>
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* Copyright (C) 2011 James Nuss <jamesnuss@nanometrics.ca>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#define PPS_GPIO_NAME "pps-gpio"
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#define pr_fmt(fmt) PPS_GPIO_NAME ": " fmt
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/pps_kernel.h>
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#include <linux/pps-gpio.h>
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#include <linux/gpio.h>
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#include <linux/list.h>
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/* Info for each registered platform device */
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struct pps_gpio_device_data {
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int irq; /* IRQ used as PPS source */
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struct pps_device *pps; /* PPS source device */
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struct pps_source_info info; /* PPS source information */
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const struct pps_gpio_platform_data *pdata;
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};
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/*
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* Report the PPS event
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*/
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static irqreturn_t pps_gpio_irq_handler(int irq, void *data)
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{
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const struct pps_gpio_device_data *info;
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struct pps_event_time ts;
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int rising_edge;
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/* Get the time stamp first */
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pps_get_ts(&ts);
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info = data;
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rising_edge = gpio_get_value(info->pdata->gpio_pin);
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if ((rising_edge && !info->pdata->assert_falling_edge) ||
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(!rising_edge && info->pdata->assert_falling_edge))
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pps_event(info->pps, &ts, PPS_CAPTUREASSERT, NULL);
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else if (info->pdata->capture_clear &&
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((rising_edge && info->pdata->assert_falling_edge) ||
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(!rising_edge && !info->pdata->assert_falling_edge)))
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pps_event(info->pps, &ts, PPS_CAPTURECLEAR, NULL);
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return IRQ_HANDLED;
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}
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static int pps_gpio_setup(struct platform_device *pdev)
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{
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int ret;
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const struct pps_gpio_platform_data *pdata = pdev->dev.platform_data;
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ret = gpio_request(pdata->gpio_pin, pdata->gpio_label);
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if (ret) {
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pr_warning("failed to request GPIO %u\n", pdata->gpio_pin);
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return -EINVAL;
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}
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ret = gpio_direction_input(pdata->gpio_pin);
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if (ret) {
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pr_warning("failed to set pin direction\n");
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gpio_free(pdata->gpio_pin);
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return -EINVAL;
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}
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return 0;
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}
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static unsigned long
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get_irqf_trigger_flags(const struct pps_gpio_platform_data *pdata)
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{
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unsigned long flags = pdata->assert_falling_edge ?
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IRQF_TRIGGER_FALLING : IRQF_TRIGGER_RISING;
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if (pdata->capture_clear) {
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flags |= ((flags & IRQF_TRIGGER_RISING) ?
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IRQF_TRIGGER_FALLING : IRQF_TRIGGER_RISING);
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}
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return flags;
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}
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static int pps_gpio_probe(struct platform_device *pdev)
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{
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struct pps_gpio_device_data *data;
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int irq;
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int ret;
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int err;
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int pps_default_params;
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const struct pps_gpio_platform_data *pdata = pdev->dev.platform_data;
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/* GPIO setup */
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ret = pps_gpio_setup(pdev);
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if (ret)
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return -EINVAL;
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/* IRQ setup */
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irq = gpio_to_irq(pdata->gpio_pin);
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if (irq < 0) {
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pr_err("failed to map GPIO to IRQ: %d\n", irq);
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err = -EINVAL;
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goto return_error;
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}
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/* allocate space for device info */
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data = devm_kzalloc(&pdev->dev, sizeof(struct pps_gpio_device_data),
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GFP_KERNEL);
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if (data == NULL) {
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err = -ENOMEM;
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goto return_error;
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}
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/* initialize PPS specific parts of the bookkeeping data structure. */
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data->info.mode = PPS_CAPTUREASSERT | PPS_OFFSETASSERT |
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PPS_ECHOASSERT | PPS_CANWAIT | PPS_TSFMT_TSPEC;
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if (pdata->capture_clear)
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data->info.mode |= PPS_CAPTURECLEAR | PPS_OFFSETCLEAR |
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PPS_ECHOCLEAR;
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data->info.owner = THIS_MODULE;
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snprintf(data->info.name, PPS_MAX_NAME_LEN - 1, "%s.%d",
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pdev->name, pdev->id);
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/* register PPS source */
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pps_default_params = PPS_CAPTUREASSERT | PPS_OFFSETASSERT;
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if (pdata->capture_clear)
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pps_default_params |= PPS_CAPTURECLEAR | PPS_OFFSETCLEAR;
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data->pps = pps_register_source(&data->info, pps_default_params);
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if (data->pps == NULL) {
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pr_err("failed to register IRQ %d as PPS source\n", irq);
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err = -EINVAL;
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goto return_error;
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}
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data->irq = irq;
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data->pdata = pdata;
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/* register IRQ interrupt handler */
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ret = request_irq(irq, pps_gpio_irq_handler,
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get_irqf_trigger_flags(pdata), data->info.name, data);
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if (ret) {
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pps_unregister_source(data->pps);
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pr_err("failed to acquire IRQ %d\n", irq);
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err = -EINVAL;
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goto return_error;
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}
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platform_set_drvdata(pdev, data);
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dev_info(data->pps->dev, "Registered IRQ %d as PPS source\n", irq);
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return 0;
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return_error:
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gpio_free(pdata->gpio_pin);
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return err;
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}
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static int pps_gpio_remove(struct platform_device *pdev)
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{
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struct pps_gpio_device_data *data = platform_get_drvdata(pdev);
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const struct pps_gpio_platform_data *pdata = data->pdata;
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platform_set_drvdata(pdev, NULL);
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free_irq(data->irq, data);
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gpio_free(pdata->gpio_pin);
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pps_unregister_source(data->pps);
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pr_info("removed IRQ %d as PPS source\n", data->irq);
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return 0;
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}
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static struct platform_driver pps_gpio_driver = {
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.probe = pps_gpio_probe,
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.remove = pps_gpio_remove,
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.driver = {
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.name = PPS_GPIO_NAME,
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.owner = THIS_MODULE
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},
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};
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static int __init pps_gpio_init(void)
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{
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int ret = platform_driver_register(&pps_gpio_driver);
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if (ret < 0)
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pr_err("failed to register platform driver\n");
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return ret;
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}
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static void __exit pps_gpio_exit(void)
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{
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platform_driver_unregister(&pps_gpio_driver);
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pr_debug("unregistered platform driver\n");
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}
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module_init(pps_gpio_init);
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module_exit(pps_gpio_exit);
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MODULE_AUTHOR("Ricardo Martins <rasm@fe.up.pt>");
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MODULE_AUTHOR("James Nuss <jamesnuss@nanometrics.ca>");
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MODULE_DESCRIPTION("Use GPIO pin as PPS source");
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MODULE_LICENSE("GPL");
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MODULE_VERSION("1.0.0");
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