Lines Matching +full:echo +full:- +full:gpios
1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * pps-gpio.c -- PPS client driver using GPIO
9 #define PPS_GPIO_NAME "pps-gpio"
19 #include <linux/pps-gpio.h>
34 struct timer_list echo_timer; /* timer to reset echo active state */
37 unsigned int echo_active_ms; /* PPS echo active duration */
56 rising_edge = gpiod_get_value(info->gpio_pin); in pps_gpio_irq_handler()
57 if ((rising_edge && !info->assert_falling_edge) || in pps_gpio_irq_handler()
58 (!rising_edge && info->assert_falling_edge)) in pps_gpio_irq_handler()
59 pps_event(info->pps, &ts, PPS_CAPTUREASSERT, data); in pps_gpio_irq_handler()
60 else if (info->capture_clear && in pps_gpio_irq_handler()
61 ((rising_edge && info->assert_falling_edge) || in pps_gpio_irq_handler()
62 (!rising_edge && !info->assert_falling_edge))) in pps_gpio_irq_handler()
63 pps_event(info->pps, &ts, PPS_CAPTURECLEAR, data); in pps_gpio_irq_handler()
68 /* This function will only be called when an ECHO GPIO is defined */
71 /* add_timer() needs to write into info->echo_timer */ in pps_gpio_echo()
76 if (pps->params.mode & PPS_ECHOASSERT) in pps_gpio_echo()
77 gpiod_set_value(info->echo_pin, 1); in pps_gpio_echo()
81 if (pps->params.mode & PPS_ECHOCLEAR) in pps_gpio_echo()
82 gpiod_set_value(info->echo_pin, 1); in pps_gpio_echo()
87 if (info->pps->params.mode & (PPS_ECHOASSERT | PPS_ECHOCLEAR)) { in pps_gpio_echo()
88 info->echo_timer.expires = jiffies + info->echo_timeout; in pps_gpio_echo()
89 add_timer(&info->echo_timer); in pps_gpio_echo()
93 /* Timer callback to reset the echo pin to the inactive state */
100 gpiod_set_value(info->echo_pin, 0); in pps_gpio_echo_timer_callback()
106 struct device_node *np = pdev->dev.of_node; in pps_gpio_setup()
110 data->gpio_pin = devm_gpiod_get(&pdev->dev, in pps_gpio_setup()
111 NULL, /* request "gpios" */ in pps_gpio_setup()
113 if (IS_ERR(data->gpio_pin)) { in pps_gpio_setup()
114 dev_err(&pdev->dev, in pps_gpio_setup()
116 return PTR_ERR(data->gpio_pin); in pps_gpio_setup()
119 data->echo_pin = devm_gpiod_get_optional(&pdev->dev, in pps_gpio_setup()
120 "echo", in pps_gpio_setup()
122 if (data->echo_pin) { in pps_gpio_setup()
123 if (IS_ERR(data->echo_pin)) { in pps_gpio_setup()
124 dev_err(&pdev->dev, "failed to request ECHO GPIO\n"); in pps_gpio_setup()
125 return PTR_ERR(data->echo_pin); in pps_gpio_setup()
129 "echo-active-ms", in pps_gpio_setup()
132 dev_err(&pdev->dev, in pps_gpio_setup()
133 "failed to get echo-active-ms from OF\n"); in pps_gpio_setup()
136 data->echo_active_ms = value; in pps_gpio_setup()
138 if (!data->echo_active_ms || data->echo_active_ms > 999) { in pps_gpio_setup()
139 dev_err(&pdev->dev, in pps_gpio_setup()
140 "echo-active-ms: %u - bad value from OF\n", in pps_gpio_setup()
141 data->echo_active_ms); in pps_gpio_setup()
142 return -EINVAL; in pps_gpio_setup()
146 if (of_property_read_bool(np, "assert-falling-edge")) in pps_gpio_setup()
147 data->assert_falling_edge = true; in pps_gpio_setup()
154 unsigned long flags = data->assert_falling_edge ? in get_irqf_trigger_flags()
157 if (data->capture_clear) { in get_irqf_trigger_flags()
170 const struct pps_gpio_platform_data *pdata = pdev->dev.platform_data; in pps_gpio_probe()
173 data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); in pps_gpio_probe()
175 return -ENOMEM; in pps_gpio_probe()
180 data->gpio_pin = pdata->gpio_pin; in pps_gpio_probe()
181 data->echo_pin = pdata->echo_pin; in pps_gpio_probe()
183 data->assert_falling_edge = pdata->assert_falling_edge; in pps_gpio_probe()
184 data->capture_clear = pdata->capture_clear; in pps_gpio_probe()
185 data->echo_active_ms = pdata->echo_active_ms; in pps_gpio_probe()
189 return -EINVAL; in pps_gpio_probe()
193 ret = gpiod_to_irq(data->gpio_pin); in pps_gpio_probe()
195 dev_err(&pdev->dev, "failed to map GPIO to IRQ: %d\n", ret); in pps_gpio_probe()
196 return -EINVAL; in pps_gpio_probe()
198 data->irq = ret; in pps_gpio_probe()
201 data->info.mode = PPS_CAPTUREASSERT | PPS_OFFSETASSERT | in pps_gpio_probe()
203 if (data->capture_clear) in pps_gpio_probe()
204 data->info.mode |= PPS_CAPTURECLEAR | PPS_OFFSETCLEAR | in pps_gpio_probe()
206 data->info.owner = THIS_MODULE; in pps_gpio_probe()
207 snprintf(data->info.name, PPS_MAX_NAME_LEN - 1, "%s.%d", in pps_gpio_probe()
208 pdev->name, pdev->id); in pps_gpio_probe()
209 if (data->echo_pin) { in pps_gpio_probe()
210 data->info.echo = pps_gpio_echo; in pps_gpio_probe()
211 data->echo_timeout = msecs_to_jiffies(data->echo_active_ms); in pps_gpio_probe()
212 timer_setup(&data->echo_timer, pps_gpio_echo_timer_callback, 0); in pps_gpio_probe()
217 if (data->capture_clear) in pps_gpio_probe()
219 data->pps = pps_register_source(&data->info, pps_default_params); in pps_gpio_probe()
220 if (IS_ERR(data->pps)) { in pps_gpio_probe()
221 dev_err(&pdev->dev, "failed to register IRQ %d as PPS source\n", in pps_gpio_probe()
222 data->irq); in pps_gpio_probe()
223 return PTR_ERR(data->pps); in pps_gpio_probe()
227 ret = devm_request_irq(&pdev->dev, data->irq, pps_gpio_irq_handler, in pps_gpio_probe()
228 get_irqf_trigger_flags(data), data->info.name, data); in pps_gpio_probe()
230 pps_unregister_source(data->pps); in pps_gpio_probe()
231 dev_err(&pdev->dev, "failed to acquire IRQ %d\n", data->irq); in pps_gpio_probe()
232 return -EINVAL; in pps_gpio_probe()
235 dev_info(data->pps->dev, "Registered IRQ %d as PPS source\n", in pps_gpio_probe()
236 data->irq); in pps_gpio_probe()
245 pps_unregister_source(data->pps); in pps_gpio_remove()
246 if (data->echo_pin) { in pps_gpio_remove()
247 del_timer_sync(&data->echo_timer); in pps_gpio_remove()
248 /* reset echo pin in any case */ in pps_gpio_remove()
249 gpiod_set_value(data->echo_pin, 0); in pps_gpio_remove()
251 dev_info(&pdev->dev, "removed IRQ %d as PPS source\n", data->irq); in pps_gpio_remove()
256 { .compatible = "pps-gpio", },