Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * pps-gpio.c -- PPS client driver using GPIO
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright (C) 2010 Ricardo Martins <rasm@fe.up.pt>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * Copyright (C) 2011 James Nuss <jamesnuss@nanometrics.ca>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #define PPS_GPIO_NAME "pps-gpio"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #define pr_fmt(fmt) PPS_GPIO_NAME ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/pps_kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/pps-gpio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <linux/gpio/consumer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <linux/list.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <linux/of_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <linux/of_gpio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include <linux/timer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #include <linux/jiffies.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) /* Info for each registered platform device */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) struct pps_gpio_device_data {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	int irq;			/* IRQ used as PPS source */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	struct pps_device *pps;		/* PPS source device */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	struct pps_source_info info;	/* PPS source information */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	struct gpio_desc *gpio_pin;	/* GPIO port descriptors */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	struct gpio_desc *echo_pin;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	struct timer_list echo_timer;	/* timer to reset echo active state */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	bool assert_falling_edge;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	bool capture_clear;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	unsigned int echo_active_ms;	/* PPS echo active duration */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	unsigned long echo_timeout;	/* timer timeout value in jiffies */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42)  * Report the PPS event
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) static irqreturn_t pps_gpio_irq_handler(int irq, void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	const struct pps_gpio_device_data *info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	struct pps_event_time ts;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	int rising_edge;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	/* Get the time stamp first */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	pps_get_ts(&ts);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	info = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	rising_edge = gpiod_get_value(info->gpio_pin);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	if ((rising_edge && !info->assert_falling_edge) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 			(!rising_edge && info->assert_falling_edge))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 		pps_event(info->pps, &ts, PPS_CAPTUREASSERT, data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	else if (info->capture_clear &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 			((rising_edge && info->assert_falling_edge) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 			(!rising_edge && !info->assert_falling_edge)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 		pps_event(info->pps, &ts, PPS_CAPTURECLEAR, data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) /* This function will only be called when an ECHO GPIO is defined */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) static void pps_gpio_echo(struct pps_device *pps, int event, void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	/* add_timer() needs to write into info->echo_timer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	struct pps_gpio_device_data *info = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	switch (event) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	case PPS_CAPTUREASSERT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 		if (pps->params.mode & PPS_ECHOASSERT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 			gpiod_set_value(info->echo_pin, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	case PPS_CAPTURECLEAR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 		if (pps->params.mode & PPS_ECHOCLEAR)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 			gpiod_set_value(info->echo_pin, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	/* fire the timer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	if (info->pps->params.mode & (PPS_ECHOASSERT | PPS_ECHOCLEAR)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 		info->echo_timer.expires = jiffies + info->echo_timeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 		add_timer(&info->echo_timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) /* Timer callback to reset the echo pin to the inactive state */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) static void pps_gpio_echo_timer_callback(struct timer_list *t)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	const struct pps_gpio_device_data *info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	info = from_timer(info, t, echo_timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	gpiod_set_value(info->echo_pin, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) static int pps_gpio_setup(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	struct pps_gpio_device_data *data = platform_get_drvdata(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	struct device_node *np = pdev->dev.of_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	u32 value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	data->gpio_pin = devm_gpiod_get(&pdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 		NULL,	/* request "gpios" */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 		GPIOD_IN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	if (IS_ERR(data->gpio_pin)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 		dev_err(&pdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 			"failed to request PPS GPIO\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 		return PTR_ERR(data->gpio_pin);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	data->echo_pin = devm_gpiod_get_optional(&pdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 			"echo",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 			GPIOD_OUT_LOW);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	if (data->echo_pin) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 		if (IS_ERR(data->echo_pin)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 			dev_err(&pdev->dev, "failed to request ECHO GPIO\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 			return PTR_ERR(data->echo_pin);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 		ret = of_property_read_u32(np,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 			"echo-active-ms",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 			&value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 		if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 			dev_err(&pdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 				"failed to get echo-active-ms from OF\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 			return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 		data->echo_active_ms = value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 		/* sanity check on echo_active_ms */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 		if (!data->echo_active_ms || data->echo_active_ms > 999) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 			dev_err(&pdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 				"echo-active-ms: %u - bad value from OF\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 				data->echo_active_ms);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 			return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	if (of_property_read_bool(np, "assert-falling-edge"))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 		data->assert_falling_edge = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) static unsigned long
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) get_irqf_trigger_flags(const struct pps_gpio_device_data *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	unsigned long flags = data->assert_falling_edge ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		IRQF_TRIGGER_FALLING : IRQF_TRIGGER_RISING;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	if (data->capture_clear) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 		flags |= ((flags & IRQF_TRIGGER_RISING) ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 				IRQF_TRIGGER_FALLING : IRQF_TRIGGER_RISING);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	return flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) static int pps_gpio_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	struct pps_gpio_device_data *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	int pps_default_params;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	const struct pps_gpio_platform_data *pdata = pdev->dev.platform_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	/* allocate space for device info */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	if (!data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	platform_set_drvdata(pdev, data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	/* GPIO setup */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	if (pdata) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 		data->gpio_pin = pdata->gpio_pin;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 		data->echo_pin = pdata->echo_pin;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 		data->assert_falling_edge = pdata->assert_falling_edge;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 		data->capture_clear = pdata->capture_clear;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 		data->echo_active_ms = pdata->echo_active_ms;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 		ret = pps_gpio_setup(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 		if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 			return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	/* IRQ setup */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	ret = gpiod_to_irq(data->gpio_pin);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 		dev_err(&pdev->dev, "failed to map GPIO to IRQ: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	data->irq = ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	/* initialize PPS specific parts of the bookkeeping data structure. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	data->info.mode = PPS_CAPTUREASSERT | PPS_OFFSETASSERT |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 		PPS_ECHOASSERT | PPS_CANWAIT | PPS_TSFMT_TSPEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	if (data->capture_clear)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 		data->info.mode |= PPS_CAPTURECLEAR | PPS_OFFSETCLEAR |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 			PPS_ECHOCLEAR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	data->info.owner = THIS_MODULE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	snprintf(data->info.name, PPS_MAX_NAME_LEN - 1, "%s.%d",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 		 pdev->name, pdev->id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	if (data->echo_pin) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 		data->info.echo = pps_gpio_echo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 		data->echo_timeout = msecs_to_jiffies(data->echo_active_ms);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 		timer_setup(&data->echo_timer, pps_gpio_echo_timer_callback, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	/* register PPS source */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	pps_default_params = PPS_CAPTUREASSERT | PPS_OFFSETASSERT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	if (data->capture_clear)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 		pps_default_params |= PPS_CAPTURECLEAR | PPS_OFFSETCLEAR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	data->pps = pps_register_source(&data->info, pps_default_params);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	if (IS_ERR(data->pps)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 		dev_err(&pdev->dev, "failed to register IRQ %d as PPS source\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 			data->irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 		return PTR_ERR(data->pps);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	/* register IRQ interrupt handler */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	ret = devm_request_irq(&pdev->dev, data->irq, pps_gpio_irq_handler,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 			get_irqf_trigger_flags(data), data->info.name, data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 		pps_unregister_source(data->pps);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 		dev_err(&pdev->dev, "failed to acquire IRQ %d\n", data->irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	dev_info(data->pps->dev, "Registered IRQ %d as PPS source\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 		 data->irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) static int pps_gpio_remove(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	struct pps_gpio_device_data *data = platform_get_drvdata(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	pps_unregister_source(data->pps);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	if (data->echo_pin) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 		del_timer_sync(&data->echo_timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 		/* reset echo pin in any case */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 		gpiod_set_value(data->echo_pin, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	dev_info(&pdev->dev, "removed IRQ %d as PPS source\n", data->irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) static const struct of_device_id pps_gpio_dt_ids[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	{ .compatible = "pps-gpio", },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	{ /* sentinel */ }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) MODULE_DEVICE_TABLE(of, pps_gpio_dt_ids);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) static struct platform_driver pps_gpio_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	.probe		= pps_gpio_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	.remove		= pps_gpio_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	.driver		= {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 		.name	= PPS_GPIO_NAME,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 		.of_match_table	= pps_gpio_dt_ids,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) module_platform_driver(pps_gpio_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) MODULE_AUTHOR("Ricardo Martins <rasm@fe.up.pt>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) MODULE_AUTHOR("James Nuss <jamesnuss@nanometrics.ca>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) MODULE_DESCRIPTION("Use GPIO pin as PPS source");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) MODULE_VERSION("1.2.0");