14 #include "gpio.h"
18 #include <linux/gpio.h>
21 #define GPIO_BASE_PATH "/sys/class/gpio"
26 int gpio_write(GPIO* gpio, uint8_t value)  in gpio_write()  argument
28 	g_assert (gpio != NULL);  in gpio_write()
33 	if (gpio->fd <= 0)  in gpio_write()
38 	if (ioctl(gpio->fd, GPIOHANDLE_SET_LINE_VALUES_IOCTL, &data) < 0)  in gpio_write()
46 int gpio_read(GPIO* gpio, uint8_t *value)  in gpio_read()  argument
48 	g_assert (gpio != NULL);  in gpio_read()
52 	if (gpio->fd <= 0)  in gpio_read()
57 	if (ioctl(gpio->fd, GPIOHANDLE_GET_LINE_VALUES_IOCTL, &data) < 0)  in gpio_read()
68  * Determine the GPIO base number for the system.  It is found in
69  * the 'base' file in the /sys/class/gpio/gpiochipX/ directory where the
70  * /sys/class/gpio/gpiochipX/label file has a '1e780000.gpio' in it.
75  * @return int - the GPIO base number, or < 0 if not found
94 		/* that contains '1e780000.gpio', then in that directory read */  in get_gpio_base()
95 		/* the GPIO base out of the 'base' file. */  in get_gpio_base()
123 			if (strcmp(label, "1e780000.gpio") == 0)  in get_gpio_base()
165 		fprintf(stderr, "Could not find GPIO base\n");  in get_gpio_base()
172  * Converts the GPIO port/offset nomenclature value
180  * @param[in] gpio - the GPIO name
182  * @return int - the GPIO number or < 0 if not found
184 int convert_gpio_to_num(const char* gpio)  in convert_gpio_to_num()  argument
186 	size_t len = strlen(gpio);  in convert_gpio_to_num()
189 		fprintf(stderr, "Invalid GPIO name %s\n", gpio);  in convert_gpio_to_num()
194 	if (!isdigit(gpio[len-1]))  in convert_gpio_to_num()
196 		fprintf(stderr, "Invalid GPIO offset in GPIO %s\n", gpio);  in convert_gpio_to_num()
200 	int offset = gpio[len-1] - '0';  in convert_gpio_to_num()
203 	if (!isalpha(gpio[len-2]))  in convert_gpio_to_num()
205 		fprintf(stderr, "Invalid GPIO port in GPIO %s\n", gpio);  in convert_gpio_to_num()
208 	int port = toupper(gpio[len-2]) - 'A';  in convert_gpio_to_num()
211 	if ((len == 3) && isalpha(gpio[len-3]))  in convert_gpio_to_num()
213 		port += 26 * (toupper(gpio[len-3]) - 'A' + 1);  in convert_gpio_to_num()
220  * Returns the cJSON pointer to the GPIO definition
221  * for the GPIO passed in.
223  * @param[in] gpio_name - the GPIO name, like BMC_POWER_UP
273  * the GPIO structure.
275  * @param gpio - the GPIO structure to fill in
279 int gpio_get_params(GPIO* gpio)  in gpio_get_params()  argument
281 	gpio->dev = g_strdup(GPIO_BASE_PATH);  in gpio_get_params()
283 	const cJSON* def = get_gpio_def(gpio->name);  in gpio_get_params()
286 		fprintf(stderr, "Unable to find GPIO %s in the JSON\n",  in gpio_get_params()
287 				gpio->name);  in gpio_get_params()
293 	gpio->direction = g_strdup(dir->valuestring);  in gpio_get_params()
314 		// Query GPIO chip info  in gpio_get_params()
327 		gpio->num = (num->valueint) % info.lines;  in gpio_get_params()
328 		gpio->chip_id = (num->valueint) / info.lines;  in gpio_get_params()
340 		gpio->num = (size_t) pin_id;  in gpio_get_params()
346 	gpio->chip_id = 0;  in gpio_get_params()
350 int gpio_open(GPIO* gpio, uint8_t default_value)  in gpio_open()  argument
352 	g_assert (gpio != NULL);  in gpio_open()
355 	sprintf(buf, "/dev/gpiochip%d", gpio->chip_id);  in gpio_open()
356 	gpio->fd = open(buf, 0);  in gpio_open()
357 	if (gpio->fd == -1)  in gpio_open()
364 	strncpy(req.consumer_label, "skeleton-gpio",  sizeof(req.consumer_label));  in gpio_open()
366 	// open gpio for writing or reading  in gpio_open()
367 	if (gpio->direction == NULL)  in gpio_open()
369 		gpio_close(gpio);  in gpio_open()
372 	req.flags = (strcmp(gpio->direction,"in") == 0) ? GPIOHANDLE_REQUEST_INPUT  in gpio_open()
375 	req.lineoffsets[0] = gpio->num;  in gpio_open()
378 	if (strcmp(gpio->direction,"out") == 0)  in gpio_open()
383 	int rc = ioctl(gpio->fd, GPIO_GET_LINEHANDLE_IOCTL, &req);  in gpio_open()
386 		gpio_close(gpio);  in gpio_open()
389 	gpio_close(gpio);  in gpio_open()
390 	gpio->fd = req.fd;  in gpio_open()
395 void gpio_close(GPIO* gpio)  in gpio_close()  argument
397 	if(gpio->fd < 0)  in gpio_close()
400 	close(gpio->fd);  in gpio_close()
401 	gpio->fd = -1;  in gpio_close()