[media] rc-core: lirc use unsigned int

Durations can never be negative, so it makes sense to consistently use
unsigned int for LIRC transmission. Contrary to the initial impression,
this shouldn't actually change the userspace API.

Signed-off-by: David Härdeman <david@hardeman.nu>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

8 files changed, 24 insertions, 43 deletions

diff --git a/drivers/media/rc/ene_ir.c b/drivers/media/rc/ene_ir.c
index a43ed6c41bfc..2b9c2569d74a 100644
--- a/drivers/media/rc/ene_ir.c
+++ b/drivers/media/rc/ene_ir.c
@@ -953,13 +953,13 @@ static void ene_set_idle(struct rc_dev *rdev, bool idle)
 }
 
 /* outside interface: transmit */
-static int ene_transmit(struct rc_dev *rdev, int *buf, u32 n)
+static int ene_transmit(struct rc_dev *rdev, unsigned *buf, unsigned n)
 {
         struct ene_device *dev = rdev->priv;
         unsigned long flags;
 
         dev->tx_buffer = buf;
-        dev->tx_len = n / sizeof(int);
+        dev->tx_len = n;
         dev->tx_pos = 0;
         dev->tx_reg = 0;
         dev->tx_done = 0;
diff --git a/drivers/media/rc/ene_ir.h b/drivers/media/rc/ene_ir.h
index 337a41d4450b..017c209cdf8a 100644
--- a/drivers/media/rc/ene_ir.h
+++ b/drivers/media/rc/ene_ir.h
@@ -235,7 +235,7 @@ struct ene_device {
         bool tx_sample_pulse;                   /* current sample is pulse */
 
         /* TX buffer */
-        int *tx_buffer;                         /* input samples buffer*/
+        unsigned *tx_buffer;                    /* input samples buffer*/
         int tx_pos;                             /* position in that bufer */
         int tx_len;                             /* current len of tx buffer */
         int tx_done;                            /* done transmitting */
diff --git a/drivers/media/rc/ir-lirc-codec.c b/drivers/media/rc/ir-lirc-codec.c
index 1c5cc65ea1e1..e5eeec4da76e 100644
--- a/drivers/media/rc/ir-lirc-codec.c
+++ b/drivers/media/rc/ir-lirc-codec.c
@@ -103,19 +103,19 @@ static ssize_t ir_lirc_transmit_ir(struct file *file, const char *buf,
 {
         struct lirc_codec *lirc;
         struct rc_dev *dev;
-        int *txbuf; /* buffer with values to transmit */
-        int ret = 0;
+        unsigned int *txbuf; /* buffer with values to transmit */
+        ssize_t ret = 0;
         size_t count;
 
         lirc = lirc_get_pdata(file);
         if (!lirc)
                 return -EFAULT;
 
-        if (n % sizeof(int))
+        if (n < sizeof(unsigned) || n % sizeof(unsigned))
                 return -EINVAL;
 
-        count = n / sizeof(int);
-        if (count > LIRCBUF_SIZE || count % 2 == 0 || n % sizeof(int) != 0)
+        count = n / sizeof(unsigned);
+        if (count > LIRCBUF_SIZE || count % 2 == 0)
                 return -EINVAL;
 
         txbuf = memdup_user(buf, n);
@@ -129,7 +129,10 @@ static ssize_t ir_lirc_transmit_ir(struct file *file, const char *buf,
         }
 
         if (dev->tx_ir)
-                ret = dev->tx_ir(dev, txbuf, (u32)n);
+                ret = dev->tx_ir(dev, txbuf, count);
+
+        if (ret > 0)
+                ret *= sizeof(unsigned);
 
 out:
         kfree(txbuf);
diff --git a/drivers/media/rc/ite-cir.c b/drivers/media/rc/ite-cir.c
index ecd3d0280768..1cee20761a3f 100644
--- a/drivers/media/rc/ite-cir.c
+++ b/drivers/media/rc/ite-cir.c
@@ -383,7 +383,7 @@ static int ite_set_tx_duty_cycle(struct rc_dev *rcdev, u32 duty_cycle)
 /* transmit out IR pulses; what you get here is a batch of alternating
  * pulse/space/pulse/space lengths that we should write out completely through
  * the FIFO, blocking on a full FIFO */
-static int ite_tx_ir(struct rc_dev *rcdev, int *txbuf, u32 n)
+static int ite_tx_ir(struct rc_dev *rcdev, unsigned *txbuf, unsigned n)
 {
         unsigned long flags;
         struct ite_dev *dev = rcdev->priv;
@@ -399,9 +399,6 @@ static int ite_tx_ir(struct rc_dev *rcdev, int *txbuf, u32 n)
         /* clear the array just in case */
         memset(last_sent, 0, ARRAY_SIZE(last_sent));
 
-        /* n comes in bytes; convert to ints */
-        n /= sizeof(int);
-
         spin_lock_irqsave(&dev->lock, flags);
 
         /* let everybody know we're now transmitting */
diff --git a/drivers/media/rc/mceusb.c b/drivers/media/rc/mceusb.c
index ec972dc25790..85ff9a1ffb39 100644
--- a/drivers/media/rc/mceusb.c
+++ b/drivers/media/rc/mceusb.c
@@ -692,20 +692,18 @@ static void mce_flush_rx_buffer(struct mceusb_dev *ir, int size)
 }
 
 /* Send data out the IR blaster port(s) */
-static int mceusb_tx_ir(struct rc_dev *dev, int *txbuf, u32 n)
+static int mceusb_tx_ir(struct rc_dev *dev, unsigned *txbuf, unsigned count)
 {
         struct mceusb_dev *ir = dev->priv;
         int i, ret = 0;
-        int count, cmdcount = 0;
+        int cmdcount = 0;
         unsigned char *cmdbuf; /* MCE command buffer */
         long signal_duration = 0; /* Singnal length in us */
         struct timeval start_time, end_time;
 
         do_gettimeofday(&start_time);
 
-        count = n / sizeof(int);
-
-        cmdbuf = kzalloc(sizeof(int) * MCE_CMDBUF_SIZE, GFP_KERNEL);
+        cmdbuf = kzalloc(sizeof(unsigned) * MCE_CMDBUF_SIZE, GFP_KERNEL);
         if (!cmdbuf)
                 return -ENOMEM;
 
@@ -774,7 +772,7 @@ static int mceusb_tx_ir(struct rc_dev *dev, int *txbuf, u32 n)
 
 out:
         kfree(cmdbuf);
-        return ret ? ret : n;
+        return ret ? ret : count;
 }
 
 /* Sets active IR outputs -- mce devices typically have two */
diff --git a/drivers/media/rc/nuvoton-cir.c b/drivers/media/rc/nuvoton-cir.c
index ce595f9ab4c7..eae05b500476 100644
--- a/drivers/media/rc/nuvoton-cir.c
+++ b/drivers/media/rc/nuvoton-cir.c
@@ -546,24 +546,18 @@ static int nvt_set_tx_carrier(struct rc_dev *dev, u32 carrier)
  * number may larger than TXFCONT (0xff). So in interrupt_handler, it has to
  * set TXFCONT as 0xff, until buf_count less than 0xff.
  */
-static int nvt_tx_ir(struct rc_dev *dev, int *txbuf, u32 n)
+static int nvt_tx_ir(struct rc_dev *dev, unsigned *txbuf, unsigned n)
 {
         struct nvt_dev *nvt = dev->priv;
         unsigned long flags;
-        size_t cur_count;
         unsigned int i;
         u8 iren;
         int ret;
 
         spin_lock_irqsave(&nvt->tx.lock, flags);
 
-        if (n >= TX_BUF_LEN) {
-                nvt->tx.buf_count = cur_count = TX_BUF_LEN;
-                ret = TX_BUF_LEN;
-        } else {
-                nvt->tx.buf_count = cur_count = n;
-                ret = n;
-        }
+        ret = min((unsigned)(TX_BUF_LEN / sizeof(unsigned)), n);
+        nvt->tx.buf_count = (ret * sizeof(unsigned));
 
         memcpy(nvt->tx.buf, txbuf, nvt->tx.buf_count);
 
diff --git a/drivers/media/rc/rc-loopback.c b/drivers/media/rc/rc-loopback.c
index cc846b2619cf..efc6a514348a 100644
--- a/drivers/media/rc/rc-loopback.c
+++ b/drivers/media/rc/rc-loopback.c
@@ -101,21 +101,14 @@ static int loop_set_rx_carrier_range(struct rc_dev *dev, u32 min, u32 max)
         return 0;
 }
 
-static int loop_tx_ir(struct rc_dev *dev, int *txbuf, u32 n)
+static int loop_tx_ir(struct rc_dev *dev, unsigned *txbuf, unsigned count)
 {
         struct loopback_dev *lodev = dev->priv;
         u32 rxmask;
-        unsigned count;
         unsigned total_duration = 0;
         unsigned i;
         DEFINE_IR_RAW_EVENT(rawir);
 
-        if (n == 0 || n % sizeof(int)) {
-                dprintk("invalid tx buffer size\n");
-                return -EINVAL;
-        }
-
-        count = n / sizeof(int);
         for (i = 0; i < count; i++)
                 total_duration += abs(txbuf[i]);
 
@@ -142,7 +135,7 @@ static int loop_tx_ir(struct rc_dev *dev, int *txbuf, u32 n)
 
         for (i = 0; i < count; i++) {
                 rawir.pulse = i % 2 ? false : true;
-                rawir.duration = abs(txbuf[i]) * 1000;
+                rawir.duration = txbuf[i] * 1000;
                 if (rawir.duration)
                         ir_raw_event_store_with_filter(dev, &rawir);
         }
@@ -158,7 +151,7 @@ out:
         /* Lirc expects this function to take as long as the total duration */
         set_current_state(TASK_INTERRUPTIBLE);
         schedule_timeout(usecs_to_jiffies(total_duration));
-        return n;
+        return count;
 }
 
 static void loop_set_idle(struct rc_dev *dev, bool enable)
diff --git a/drivers/media/rc/winbond-cir.c b/drivers/media/rc/winbond-cir.c
index 18e70d104f80..bec8abc965f7 100644
--- a/drivers/media/rc/winbond-cir.c
+++ b/drivers/media/rc/winbond-cir.c
@@ -577,16 +577,12 @@ wbcir_txmask(struct rc_dev *dev, u32 mask)
 }
 
 static int
-wbcir_tx(struct rc_dev *dev, int *buf, u32 bufsize)
+wbcir_tx(struct rc_dev *dev, unsigned *buf, unsigned count)
 {
         struct wbcir_data *data = dev->priv;
-        u32 count;
         unsigned i;
         unsigned long flags;
 
-        /* bufsize has been sanity checked by the caller */
-        count = bufsize / sizeof(int);
-
         /* Not sure if this is possible, but better safe than sorry */
         spin_lock_irqsave(&data->spinlock, flags);
         if (data->txstate != WBCIR_TXSTATE_INACTIVE) {