[media] btcx-risc: move from media/i2c to media/common

The btcx-risc module is a helper module for bttv/conexant based TV cards.
It isn't an i2c module at all, instead it should be in common since it is
used by 4 pci drivers.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 260 insertions, 0 deletions

diff --git a/drivers/media/common/btcx-risc.c b/drivers/media/common/btcx-risc.c
new file mode 100644
index 000000000000..ac1b2687a20d
--- /dev/null
+++ b/drivers/media/common/btcx-risc.c
@@ -0,0 +1,260 @@
+/*
+
+    btcx-risc.c
+
+    bt848/bt878/cx2388x risc code generator.
+
+    (c) 2000-03 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
+
+    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., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <linux/interrupt.h>
+#include <linux/videodev2.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+
+#include "btcx-risc.h"
+
+MODULE_DESCRIPTION("some code shared by bttv and cx88xx drivers");
+MODULE_AUTHOR("Gerd Knorr");
+MODULE_LICENSE("GPL");
+
+static unsigned int debug;
+module_param(debug, int, 0644);
+MODULE_PARM_DESC(debug,"debug messages, default is 0 (no)");
+
+/* ---------------------------------------------------------- */
+/* allocate/free risc memory                                  */
+
+static int memcnt;
+
+void btcx_riscmem_free(struct pci_dev *pci,
+		       struct btcx_riscmem *risc)
+{
+	if (NULL == risc->cpu)
+		return;
+	if (debug) {
+		memcnt--;
+		printk("btcx: riscmem free [%d] dma=%lx\n",
+		       memcnt, (unsigned long)risc->dma);
+	}
+	pci_free_consistent(pci, risc->size, risc->cpu, risc->dma);
+	memset(risc,0,sizeof(*risc));
+}
+
+int btcx_riscmem_alloc(struct pci_dev *pci,
+		       struct btcx_riscmem *risc,
+		       unsigned int size)
+{
+	__le32 *cpu;
+	dma_addr_t dma = 0;
+
+	if (NULL != risc->cpu && risc->size < size)
+		btcx_riscmem_free(pci,risc);
+	if (NULL == risc->cpu) {
+		cpu = pci_alloc_consistent(pci, size, &dma);
+		if (NULL == cpu)
+			return -ENOMEM;
+		risc->cpu  = cpu;
+		risc->dma  = dma;
+		risc->size = size;
+		if (debug) {
+			memcnt++;
+			printk("btcx: riscmem alloc [%d] dma=%lx cpu=%p size=%d\n",
+			       memcnt, (unsigned long)dma, cpu, size);
+		}
+	}
+	memset(risc->cpu,0,risc->size);
+	return 0;
+}
+
+/* ---------------------------------------------------------- */
+/* screen overlay helpers                                     */
+
+int
+btcx_screen_clips(int swidth, int sheight, struct v4l2_rect *win,
+		  struct v4l2_clip *clips, unsigned int n)
+{
+	if (win->left < 0) {
+		/* left */
+		clips[n].c.left = 0;
+		clips[n].c.top = 0;
+		clips[n].c.width  = -win->left;
+		clips[n].c.height = win->height;
+		n++;
+	}
+	if (win->left + win->width > swidth) {
+		/* right */
+		clips[n].c.left   = swidth - win->left;
+		clips[n].c.top    = 0;
+		clips[n].c.width  = win->width - clips[n].c.left;
+		clips[n].c.height = win->height;
+		n++;
+	}
+	if (win->top < 0) {
+		/* top */
+		clips[n].c.left = 0;
+		clips[n].c.top = 0;
+		clips[n].c.width  = win->width;
+		clips[n].c.height = -win->top;
+		n++;
+	}
+	if (win->top + win->height > sheight) {
+		/* bottom */
+		clips[n].c.left = 0;
+		clips[n].c.top = sheight - win->top;
+		clips[n].c.width  = win->width;
+		clips[n].c.height = win->height - clips[n].c.top;
+		n++;
+	}
+	return n;
+}
+
+int
+btcx_align(struct v4l2_rect *win, struct v4l2_clip *clips, unsigned int n, int mask)
+{
+	s32 nx,nw,dx;
+	unsigned int i;
+
+	/* fixup window */
+	nx = (win->left + mask) & ~mask;
+	nw = (win->width) & ~mask;
+	if (nx + nw > win->left + win->width)
+		nw -= mask+1;
+	dx = nx - win->left;
+	win->left  = nx;
+	win->width = nw;
+	if (debug)
+		printk(KERN_DEBUG "btcx: window align %dx%d+%d+%d [dx=%d]\n",
+		       win->width, win->height, win->left, win->top, dx);
+
+	/* fixup clips */
+	for (i = 0; i < n; i++) {
+		nx = (clips[i].c.left-dx) & ~mask;
+		nw = (clips[i].c.width) & ~mask;
+		if (nx + nw < clips[i].c.left-dx + clips[i].c.width)
+			nw += mask+1;
+		clips[i].c.left  = nx;
+		clips[i].c.width = nw;
+		if (debug)
+			printk(KERN_DEBUG "btcx:   clip align %dx%d+%d+%d\n",
+			       clips[i].c.width, clips[i].c.height,
+			       clips[i].c.left, clips[i].c.top);
+	}
+	return 0;
+}
+
+void
+btcx_sort_clips(struct v4l2_clip *clips, unsigned int nclips)
+{
+	struct v4l2_clip swap;
+	int i,j,n;
+
+	if (nclips < 2)
+		return;
+	for (i = nclips-2; i >= 0; i--) {
+		for (n = 0, j = 0; j <= i; j++) {
+			if (clips[j].c.left > clips[j+1].c.left) {
+				swap = clips[j];
+				clips[j] = clips[j+1];
+				clips[j+1] = swap;
+				n++;
+			}
+		}
+		if (0 == n)
+			break;
+	}
+}
+
+void
+btcx_calc_skips(int line, int width, int *maxy,
+		struct btcx_skiplist *skips, unsigned int *nskips,
+		const struct v4l2_clip *clips, unsigned int nclips)
+{
+	unsigned int clip,skip;
+	int end, maxline;
+
+	skip=0;
+	maxline = 9999;
+	for (clip = 0; clip < nclips; clip++) {
+
+		/* sanity checks */
+		if (clips[clip].c.left + clips[clip].c.width <= 0)
+			continue;
+		if (clips[clip].c.left > (signed)width)
+			break;
+
+		/* vertical range */
+		if (line > clips[clip].c.top+clips[clip].c.height-1)
+			continue;
+		if (line < clips[clip].c.top) {
+			if (maxline > clips[clip].c.top-1)
+				maxline = clips[clip].c.top-1;
+			continue;
+		}
+		if (maxline > clips[clip].c.top+clips[clip].c.height-1)
+			maxline = clips[clip].c.top+clips[clip].c.height-1;
+
+		/* horizontal range */
+		if (0 == skip || clips[clip].c.left > skips[skip-1].end) {
+			/* new one */
+			skips[skip].start = clips[clip].c.left;
+			if (skips[skip].start < 0)
+				skips[skip].start = 0;
+			skips[skip].end = clips[clip].c.left + clips[clip].c.width;
+			if (skips[skip].end > width)
+				skips[skip].end = width;
+			skip++;
+		} else {
+			/* overlaps -- expand last one */
+			end = clips[clip].c.left + clips[clip].c.width;
+			if (skips[skip-1].end < end)
+				skips[skip-1].end = end;
+			if (skips[skip-1].end > width)
+				skips[skip-1].end = width;
+		}
+	}
+	*nskips = skip;
+	*maxy = maxline;
+
+	if (debug) {
+		printk(KERN_DEBUG "btcx: skips line %d-%d:",line,maxline);
+		for (skip = 0; skip < *nskips; skip++) {
+			printk(" %d-%d",skips[skip].start,skips[skip].end);
+		}
+		printk("\n");
+	}
+}
+
+/* ---------------------------------------------------------- */
+
+EXPORT_SYMBOL(btcx_riscmem_alloc);
+EXPORT_SYMBOL(btcx_riscmem_free);
+
+EXPORT_SYMBOL(btcx_screen_clips);
+EXPORT_SYMBOL(btcx_align);
+EXPORT_SYMBOL(btcx_sort_clips);
+EXPORT_SYMBOL(btcx_calc_skips);
+
+/*
+ * Local variables:
+ * c-basic-offset: 8
+ * End:
+ */