2  * GPIO tools - helpers library for the GPIO tools
21 #include "gpio-utils.h"
23 #define COMSUMER "gpio-utils"
30  * ioctl, including request and release for lines of gpio, read/write
32  * lines of gpio, user should use this type of api.
35  * following api will request gpio lines, do the operation and then
36  * release these lines.
39  * gpiotools_request_linehandle() - request gpio lines in a gpiochip
42  * @lines:		An array desired lines, specified by offset
44  * @nline:		The number of lines to request.
47  * @data:		Default value will be set to gpio when flag is
53  * Request gpio lines through the ioctl provided by chardev. User
56  * gpiotools_release_linehandle() to release these lines after that.
61 int gpiotools_request_linehandle(const char *device_name, unsigned int *lines,  in gpiotools_request_linehandle()  argument
63 				 struct gpiohandle_data *data,  in gpiotools_request_linehandle()  argument
74 		return -ENOMEM;  in gpiotools_request_linehandle()
77 	if (fd == -1) {  in gpiotools_request_linehandle()
78 		ret = -errno;  in gpiotools_request_linehandle()
85 		req.lineoffsets[i] = lines[i];  in gpiotools_request_linehandle()
89 	req.lines = nlines;  in gpiotools_request_linehandle()
91 		memcpy(req.default_values, data, sizeof(req.default_values));  in gpiotools_request_linehandle()
94 	if (ret == -1) {  in gpiotools_request_linehandle()
95 		ret = -errno;  in gpiotools_request_linehandle()
101 	if (close(fd) == -1)  in gpiotools_request_linehandle()
110  * @data:		The array of values want to set.
115 int gpiotools_set_values(const int fd, struct gpiohandle_data *data)  in gpiotools_set_values()  argument
119 	ret = ioctl(fd, GPIOHANDLE_SET_LINE_VALUES_IOCTL, data);  in gpiotools_set_values()
120 	if (ret == -1) {  in gpiotools_set_values()
121 		ret = -errno;  in gpiotools_set_values()
134  * @data:		The array of values get from hardware.
139 int gpiotools_get_values(const int fd, struct gpiohandle_data *data)  in gpiotools_get_values()  argument
143 	ret = ioctl(fd, GPIOHANDLE_GET_LINE_VALUES_IOCTL, data);  in gpiotools_get_values()
144 	if (ret == -1) {  in gpiotools_get_values()
145 		ret = -errno;  in gpiotools_get_values()
167 	if (ret == -1) {  in gpiotools_release_linehandle()
169 		ret = -errno;  in gpiotools_release_linehandle()
186 	struct gpiohandle_data data;  in gpiotools_get()  local
187 	unsigned int lines[] = {line};  in gpiotools_get()  local
189 	gpiotools_gets(device_name, lines, 1, &data);  in gpiotools_get()
190 	return data.values[0];  in gpiotools_get()
195  * gpiotools_gets(): Get values from specific lines.
198  * @lines:		An array desired lines, specified by offset
200  * @nline:		The number of lines to request.
201  * @data:		The array of values get from gpiochip.
206 int gpiotools_gets(const char *device_name, unsigned int *lines,  in gpiotools_gets()  argument
207 		   unsigned int nlines, struct gpiohandle_data *data)  in gpiotools_gets()  argument
213 	ret = gpiotools_request_linehandle(device_name, lines, nlines,  in gpiotools_gets()
214 					   GPIOHANDLE_REQUEST_INPUT, data,  in gpiotools_gets()
220 	ret = gpiotools_get_values(fd, data);  in gpiotools_gets()
238 	struct gpiohandle_data data;  in gpiotools_set()  local
239 	unsigned int lines[] = {line};  in gpiotools_set()  local
241 	data.values[0] = value;  in gpiotools_set()
242 	return gpiotools_sets(device_name, lines, 1, &data);  in gpiotools_set()
246  * gpiotools_sets(): Set values to specific lines.
249  * @lines:		An array desired lines, specified by offset
251  * @nline:		The number of lines to request.
252  * @data:		The array of values set to gpiochip, must be
258 int gpiotools_sets(const char *device_name, unsigned int *lines,  in gpiotools_sets()  argument
259 		   unsigned int nlines, struct gpiohandle_data *data)  in gpiotools_sets()  argument
263 	ret = gpiotools_request_linehandle(device_name, lines, nlines,  in gpiotools_sets()
264 					   GPIOHANDLE_REQUEST_OUTPUT, data,  in gpiotools_sets()