From c0f84b0437615ba26307d93018a0d0e3f8bbb9e4 Mon Sep 17 00:00:00 2001 From: Andi Shyti Date: Sat, 18 May 2013 23:32:12 +0200 Subject: misc: apds990x_als: added apds990x proximity test apds990x is a combined proximity/als sensor. The test provides a basic test for the als part. The following are the testing steps: - power on the sensor - read 10 times the lux value on 1 second interval Signed-off-by: Andi Shyti --- drivers/misc/apds990x_als.c | 153 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 153 insertions(+) create mode 100644 drivers/misc/apds990x_als.c diff --git a/drivers/misc/apds990x_als.c b/drivers/misc/apds990x_als.c new file mode 100644 index 0000000..abad5e8 --- /dev/null +++ b/drivers/misc/apds990x_als.c @@ -0,0 +1,153 @@ +/* + * apds990x ambient light sensor testing module + * Copyright (C) 2013 Andi Shyti + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include +#include +#include +#include +#include +#include + +#define MAX_N 100 +#define ENABLE "1" +#define DISABLE "0" + +struct device { + unsigned int n; + + char *power; + char *als_raw; +}; + +struct device apds990x_dev = { + .n = 10, + .power = "/sys/class/i2c-adapter/i2c-0012/12-0039/power_state", + .als_raw = "/sys/class/i2c-adapter/i2c-0012/12-0039/lux0_raw", +}; + +int write_file(char *fname, const char *val) +{ + int fd; + ssize_t ret; + + fd = open(fname, O_WRONLY); + if (fd < 0) { + fprintf(stderr, "%s: %s\n", fname, strerror(errno)); + return errno; + } + + ret = write(fd, val, 1); + if (ret != 1) { + fprintf(stderr, "%s: %s\n", fname, strerror(errno)); + close(fd); + return errno; + } + + fd = close(fd); + if (fd < 0) + fprintf(stderr, "%s: %s\n", fname, strerror(errno)); + + return errno; +} + +int read_als(void) +{ + int i, fd; + ssize_t ret; + char val[6]; + + fd = open(apds990x_dev.als_raw, O_RDONLY); + if (fd < 0) { + fprintf(stderr, "%s: %s\n", apds990x_dev.als_raw, + strerror(errno)); + return errno; + } + + for (i = 0; i < apds990x_dev.n; i++) { + ret = read(fd, val, 5); + if (!ret) { + fprintf(stderr, "%s: %s\n", + apds990x_dev.als_raw, strerror(errno)); + break; + } + + val[ret] = '\0'; + printf("%s\n", val); + sleep(1); + } + + return errno; +} + +void print_usage(char *name) +{ + printf("Usage: %s [-n ]\n", name); + printf("\n"); + printf(" -n - number of readings on the device\n"); + printf(" -h, --help - print help menu\n"); +} + +int parse_cmdline(int argc, char *argv[]) +{ + int i; + unsigned long int n; + + for (i = 1; i < argc; i++) { + if (!strcmp(argv[i], "-n")) { + n = strtoul(argv[++i], NULL, 10); + /* check for overflow */ + if (errno) + return errno; + + apds990x_dev.n = ((n > MAX_N) || (n <= 0)) ? + MAX_N : (unsigned int) n; + } else if (!strcmp(argv[i], "-h") || + !strcmp(argv[i], "--help")) { + print_usage(argv[0]); + exit(EXIT_SUCCESS); + } else { + fprintf(stderr, "%s: %s\n\n", + argv[i], strerror(EINVAL)); + print_usage(argv[0]); + return EINVAL; + } + } + + return 0; +} + +int main(int argc, char *argv[]) +{ + int err; + + if (argc > 1) { + err = parse_cmdline(argc, argv); + if (err) + return err; + } + + err = write_file(apds990x_dev.power, ENABLE); + if (err) + return err; + + read_als(); + err = write_file(apds990x_dev.power, DISABLE); + + return err; +} -- cgit v1.2.3