[media] media: lirc_dev: make chunk_size and buffer_size mandatory

Make setting chunk_size and buffer_size mandatory for drivers which
expect lirc_dev to allocate the lirc_buffer (i.e. ir-lirc-codec) and
don't set them in lirc-zilog (which creates its own buffer).

Also remove an unnecessary copy of chunk_size in struct irctl (the
same information is already available from struct lirc_buffer).

Signed-off-by: David Härdeman <david@hardeman.nu>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

diff --git a/drivers/media/rc/lirc_dev.c b/drivers/media/rc/lirc_dev.c
index ffa203e..1915ffc 100644 (file)
--- a/drivers/media/rc/lirc_dev.c
+++ b/drivers/media/rc/lirc_dev.c
@@ -41,7 +41,6 @@ struct irctl {
        struct mutex irctl_lock;
        struct lirc_buffer *buf;
        bool buf_internal;
-       unsigned int chunk_size;
 
        struct device dev;
        struct cdev cdev;
@@ -74,16 +73,8 @@ static void lirc_release(struct device *ld)
 static int lirc_allocate_buffer(struct irctl *ir)
 {
        int err = 0;
-       int bytes_in_key;
-       unsigned int chunk_size;
-       unsigned int buffer_size;
        struct lirc_driver *d = &ir->d;
 
-       bytes_in_key = BITS_TO_LONGS(d->code_length) +
-                                               (d->code_length % 8 ? 1 : 0);
-       buffer_size = d->buffer_size ? d->buffer_size : BUFLEN / bytes_in_key;
-       chunk_size  = d->chunk_size  ? d->chunk_size  : bytes_in_key;
-
        if (d->rbuf) {
                ir->buf = d->rbuf;
                ir->buf_internal = false;
@@ -94,7 +85,7 @@ static int lirc_allocate_buffer(struct irctl *ir)
                        goto out;
                }
 
-               err = lirc_buffer_init(ir->buf, chunk_size, buffer_size);
+               err = lirc_buffer_init(ir->buf, d->chunk_size, d->buffer_size);
                if (err) {
                        kfree(ir->buf);
                        ir->buf = NULL;
@@ -104,7 +95,6 @@ static int lirc_allocate_buffer(struct irctl *ir)
                ir->buf_internal = true;
                d->rbuf = ir->buf;
        }
-       ir->chunk_size = ir->buf->chunk_size;
 
 out:
        return err;
@@ -131,6 +121,16 @@ int lirc_register_driver(struct lirc_driver *d)
                return -EINVAL;
        }
 
+       if (!d->rbuf && d->chunk_size < 1) {
+               pr_err("chunk_size must be set!\n");
+               return -EINVAL;
+       }
+
+       if (!d->rbuf && d->buffer_size < 1) {
+               pr_err("buffer_size must be set!\n");
+               return -EINVAL;
+       }
+
        if (d->code_length < 1 || d->code_length > (BUFLEN * 8)) {
                dev_err(d->dev, "code length must be less than %d bits\n",
                                                                BUFLEN * 8);
@@ -407,7 +407,7 @@ ssize_t lirc_dev_fop_read(struct file *file,
 
        dev_dbg(ir->d.dev, LOGHEAD "read called\n", ir->d.name, ir->d.minor);
 
-       buf = kzalloc(ir->chunk_size, GFP_KERNEL);
+       buf = kzalloc(ir->buf->chunk_size, GFP_KERNEL);
        if (!buf)
                return -ENOMEM;
 
@@ -420,7 +420,7 @@ ssize_t lirc_dev_fop_read(struct file *file,
                goto out_locked;
        }
 
-       if (length % ir->chunk_size) {
+       if (length % ir->buf->chunk_size) {
                ret = -EINVAL;
                goto out_locked;
        }

diff --git a/drivers/staging/media/lirc/lirc_zilog.c b/drivers/staging/media/lirc/lirc_zilog.c
index c4a4c2f..780b2d9 100644 (file)
--- a/drivers/staging/media/lirc/lirc_zilog.c
+++ b/drivers/staging/media/lirc/lirc_zilog.c
@@ -1348,8 +1348,6 @@ static const struct file_operations lirc_fops = {
 static struct lirc_driver lirc_template = {
        .name           = "lirc_zilog",
        .code_length    = 13,
-       .buffer_size    = BUFLEN / 2,
-       .chunk_size     = 2,
        .fops           = &lirc_fops,
        .owner          = THIS_MODULE,
 };
@@ -1456,8 +1454,7 @@ static int ir_probe(struct i2c_client *client, const struct i2c_device_id *id)
                ir->l.dev  = &adap->dev;
                /* This will be returned by lirc_get_pdata() */
                ir->l.data = ir;
-               ret = lirc_buffer_init(ir->l.rbuf,
-                                      ir->l.chunk_size, ir->l.buffer_size);
+               ret = lirc_buffer_init(ir->l.rbuf, 2, BUFLEN / 2);
                if (ret)
                        goto out_put_ir;
        }

diff --git a/include/media/lirc_dev.h b/include/media/lirc_dev.h
index d07a532..8e3894e 100644 (file)
--- a/include/media/lirc_dev.h
+++ b/include/media/lirc_dev.h
@@ -121,13 +121,14 @@ static inline unsigned int lirc_buffer_write(struct lirc_buffer *buf,
  *
  * @code_length:       length of the remote control key code expressed in bits.
  *
- * @buffer_size:       Number of FIFO buffers with @chunk_size size. If zero,
- *                     creates a buffer with BUFLEN size (16 bytes).
- *
  * @features:          lirc compatible hardware features, like LIRC_MODE_RAW,
  *                     LIRC_CAN\_\*, as defined at include/media/lirc.h.
  *
+ * @buffer_size:       Number of FIFO buffers with @chunk_size size.
+ *                     Only used if @rbuf is NULL.
+ *
  * @chunk_size:                Size of each FIFO buffer.
+ *                     Only used if @rbuf is NULL.
  *
  * @data:              it may point to any driver data and this pointer will
  *                     be passed to all callback functions.
@@ -162,9 +163,9 @@ struct lirc_driver {
        char name[40];
        unsigned int minor;
        __u32 code_length;
-       unsigned int buffer_size; /* in chunks holding one code each */
        __u32 features;
 
+       unsigned int buffer_size; /* in chunks holding one code each */
        unsigned int chunk_size;
 
        void *data;