[PATCH v2 2/3] commands: pwm: add pwm_get command

[Marc Reilly]

Signed-off-by: Marc Reilly <marc at cpdesign.com.au>
---
 commands/Kconfig |  7 ++++++
 commands/pwm.c   | 57 ++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 64 insertions(+)

diff --git a/commands/Kconfig b/commands/Kconfig
index cc7585bbb2..f2a6d22f69 100644
--- a/commands/Kconfig
+++ b/commands/Kconfig
@@ -1940,6 +1940,13 @@ config CMD_PWM
 
 	  Controls the pwm values such as period and duty cycle
 
+
+	  pwm_get - get pwm state
+
+	  Usage: pwm_get [d]
+
+	  Displays the pwm values such as period and duty cycle
+
 config CMD_LED
 	bool
 	depends on LED
diff --git a/commands/pwm.c b/commands/pwm.c
index a21b918c89..d344f7e1ec 100644
--- a/commands/pwm.c
+++ b/commands/pwm.c
@@ -141,3 +141,60 @@ BAREBOX_CMD_START(pwm_set)
 	BAREBOX_CMD_GROUP(CMD_GRP_HWMANIP)
 	BAREBOX_CMD_HELP(cmd_pwm_set_help)
 BAREBOX_CMD_END
+
+#define HZ_FROM_NANOSECONDS(x) (1000000000UL/(x))
+
+static int do_pwm_get(int argc, char *argv[])
+{
+	struct pwm_device *pwm = NULL;
+	struct pwm_state state;
+	int error = 0;
+	char *devname = NULL;
+	int opt;
+
+	while ((opt = getopt(argc, argv, "d:")) > 0) {
+		switch (opt) {
+		case 'd':
+			devname = optarg;
+			break;
+		}
+	}
+
+	if (!devname) {
+		printf(" need to specify a device\n");
+		return COMMAND_ERROR_USAGE;
+	}
+
+	pwm = pwm_request(devname);
+	if (!pwm) {
+		printf(" pwm device %s not found\n", devname);
+		return -ENODEV;
+	}
+
+	pwm_get_state(pwm, &state);
+
+	printf(" pwm params for '%s':\n", devname);
+	printf("  period_ns: %u (ns)\n", state.period_ns);
+	printf("  duty_ns  : %u (ns)\n", state.duty_ns);
+	printf("  enabled  : %d\n", state.p_enable);
+	printf("  polarity : %s\n", state.polarity == 0 ? "Normal" : "Inverted");
+	printf("  freq     : %lu (Hz)\n", HZ_FROM_NANOSECONDS(state.period_ns));
+
+	pwm_free(pwm);
+	return error;
+}
+
+BAREBOX_CMD_HELP_START(pwm_get)
+BAREBOX_CMD_HELP_TEXT("Gets a pwm device parameters.")
+BAREBOX_CMD_HELP_TEXT(" Specify the device by device name")
+BAREBOX_CMD_HELP_TEXT("Options:")
+BAREBOX_CMD_HELP_OPT("-d string", "device name (eg 'pwm0')")
+BAREBOX_CMD_HELP_END
+
+BAREBOX_CMD_START(pwm_get)
+	.cmd		= do_pwm_get,
+	BAREBOX_CMD_DESC("get pwm")
+	BAREBOX_CMD_OPTS("[-d]")
+	BAREBOX_CMD_GROUP(CMD_GRP_HWMANIP)
+	BAREBOX_CMD_HELP(cmd_pwm_get_help)
+BAREBOX_CMD_END
-- 
2.35.3