Make pwm channel numbers unsigned.

sys/dev/pwm/pwmbus.c

@@ -57,7 +57,7 @@ struct pwmbus_softc {
 	device_t	dev;
 	device_t	parent;
 
-	int		nchannels;
+	u_int		nchannels;
 };
 
 static int
@@ -103,43 +103,43 @@ pwmbus_detach(device_t dev)
 }
 
 static int
-pwmbus_channel_config(device_t dev, int chan, u_int period, u_int duty)
+pwmbus_channel_config(device_t dev, u_int chan, u_int period, u_int duty)
 {
 	return (PWMBUS_CHANNEL_CONFIG(device_get_parent(dev), chan, period, duty));
 }
 
 static int
-pwmbus_channel_get_config(device_t dev, int chan, u_int *period, u_int *duty)
+pwmbus_channel_get_config(device_t dev, u_int chan, u_int *period, u_int *duty)
 {
 	return (PWMBUS_CHANNEL_GET_CONFIG(device_get_parent(dev), chan, period, duty));
 }
 
 static int
-pwmbus_channel_get_flags(device_t dev, int chan, uint32_t *flags)
+pwmbus_channel_get_flags(device_t dev, u_int chan, uint32_t *flags)
 {
 	return (PWMBUS_CHANNEL_GET_FLAGS(device_get_parent(dev), chan, flags));
 }
 
 static int
-pwmbus_channel_enable(device_t dev, int chan, bool enable)
+pwmbus_channel_enable(device_t dev, u_int chan, bool enable)
 {
 	return (PWMBUS_CHANNEL_ENABLE(device_get_parent(dev), chan, enable));
 }
 
 static int
-pwmbus_channel_set_flags(device_t dev, int chan, uint32_t flags)
+pwmbus_channel_set_flags(device_t dev, u_int chan, uint32_t flags)
 {
 	return (PWMBUS_CHANNEL_SET_FLAGS(device_get_parent(dev), chan, flags));
 }
 
 static int
-pwmbus_channel_is_enabled(device_t dev, int chan, bool *enable)
+pwmbus_channel_is_enabled(device_t dev, u_int chan, bool *enable)
 {
 	return (PWMBUS_CHANNEL_IS_ENABLED(device_get_parent(dev), chan, enable));
 }
 
 static int
-pwmbus_channel_count(device_t dev, int *nchannel)
+pwmbus_channel_count(device_t dev, u_int *nchannel)
 {
 	return (PWMBUS_CHANNEL_COUNT(device_get_parent(dev), nchannel));
 }

sys/dev/pwm/pwmbus.h

@@ -34,7 +34,7 @@
 
 struct pwm_channel {
 	device_t	dev;
-	int		channel;
+	u_int		channel;
 	uint64_t	period;
 	uint64_t	duty;
 	uint32_t	flags;

sys/dev/pwm/pwmbus_if.m

@@ -33,14 +33,14 @@ INTERFACE pwmbus;
 
 CODE {
 	static int
-	pwm_default_set_flags(device_t dev, int channel, uint32_t flags)
+	pwm_default_set_flags(device_t dev, u_int channel, uint32_t flags)
 	{
 
 		return (EOPNOTSUPP);
 	}
 
 	static int
-	pwm_default_get_flags(device_t dev, int channel, uint32_t *flags)
+	pwm_default_get_flags(device_t dev, u_int channel, uint32_t *flags)
 	{
 
 		*flags = 0;
@@ -54,7 +54,7 @@ CODE {
 #
 METHOD int channel_config {
 	device_t bus;
-	int channel;
+	u_int channel;
 	unsigned int period;
 	unsigned int duty;
 };
@@ -65,7 +65,7 @@ METHOD int channel_config {
 #
 METHOD int channel_get_config {
 	device_t bus;
-	int channel;
+	u_int channel;
 	unsigned int *period;
 	unsigned int *duty;
 };
@@ -75,7 +75,7 @@ METHOD int channel_get_config {
 #
 METHOD int channel_set_flags {
 	device_t bus;
-	int channel;
+	u_int channel;
 	uint32_t flags;
 } DEFAULT pwm_default_set_flags;
 
@@ -84,7 +84,7 @@ METHOD int channel_set_flags {
 #
 METHOD int channel_get_flags {
 	device_t dev;
-	int channel;
+	u_int channel;
 	uint32_t *flags;
 } DEFAULT pwm_default_get_flags;
 
@@ -93,7 +93,7 @@ METHOD int channel_get_flags {
 #
 METHOD int channel_enable {
 	device_t bus;
-	int channel;
+	u_int channel;
 	bool enable;
 };
 
@@ -102,7 +102,7 @@ METHOD int channel_enable {
 #
 METHOD int channel_is_enabled {
 	device_t bus;
-	int channel;
+	u_int channel;
 	bool *enabled;
 };
 
@@ -111,5 +111,5 @@ METHOD int channel_is_enabled {
 #
 METHOD int channel_count {
 	device_t bus;
-	int *nchannel;
+	u_int *nchannel;
 };

sys/dev/pwm/pwmc.c

@@ -54,7 +54,7 @@ pwm_ioctl(struct cdev *dev, u_long cmd, caddr_t data,
 	struct pwmc_softc *sc;
 	struct pwm_state state;
 	device_t bus;
-	int nchannel;
+	u_int nchannel;
 	int rv = 0;
 
 	sc = dev->si_drv1;
@@ -62,7 +62,7 @@ pwm_ioctl(struct cdev *dev, u_long cmd, caddr_t data,
 
 	switch (cmd) {
 	case PWMMAXCHANNEL:
-		nchannel = -1;
+		nchannel = 0;
 		rv = PWMBUS_CHANNEL_COUNT(bus, &nchannel);
 		bcopy(&nchannel, data, sizeof(nchannel));
 		break;