[PATCH] v4l: (946) adds support for cx25840 video decoder

Adds support for cx25840 video decoder.

Driver authors: Hans Verkuil, Chris Kennedy, Tyler Trafford, Ulf Eklund.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Chris Kennedy <c@groovy.org>
Signed-off-by: Tyler Trafford <tatrafford@comcast.net>
Thanks-to: Ulf Eklund <ivtv@eklund.to>.
Signed-off-by: Mauro Carvalho Chehab <mchehab@brturbo.com.br>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 167 insertions, 0 deletions

diff --git a/drivers/media/video/cx25840/cx25840-firmware.c b/drivers/media/video/cx25840/cx25840-firmware.c
new file mode 100644
index 000000000000..0ce4a9550eb2
--- /dev/null
+++ b/drivers/media/video/cx25840/cx25840-firmware.c
@@ -0,0 +1,167 @@
+/* cx25840 firmware functions
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/i2c-algo-bit.h>
+#include <linux/firmware.h>
+#include <media/v4l2-common.h>
+
+#include "cx25840.h"
+
+#define FWFILE "HcwMakoA.ROM"
+#define FWSEND 1024
+
+#define FWDEV(x) &((x)->adapter->dev)
+
+static int fastfw = 1;
+static char *firmware = FWFILE;
+
+module_param(fastfw, bool, 0444);
+module_param(firmware, charp, 0444);
+
+MODULE_PARM_DESC(fastfw, "Load firmware fast [0=100MHz 1=333MHz (default)]");
+MODULE_PARM_DESC(firmware, "Firmware image [default: " FWFILE "]");
+
+static inline void set_i2c_delay(struct i2c_client *client, int delay)
+{
+        struct i2c_algo_bit_data *algod = client->adapter->algo_data;
+
+        /* We aren't guaranteed to be using algo_bit,
+         * so avoid the null pointer dereference
+         * and disable the 'fast firmware load' */
+        if (algod) {
+                algod->udelay = delay;
+        } else {
+                fastfw = 0;
+        }
+}
+
+static inline void start_fw_load(struct i2c_client *client)
+{
+        /* DL_ADDR_LB=0 DL_ADDR_HB=0 */
+        cx25840_write(client, 0x800, 0x00);
+        cx25840_write(client, 0x801, 0x00);
+        // DL_MAP=3 DL_AUTO_INC=0 DL_ENABLE=1
+        cx25840_write(client, 0x803, 0x0b);
+        /* AUTO_INC_DIS=1 */
+        cx25840_write(client, 0x000, 0x20);
+
+        if (fastfw)
+                set_i2c_delay(client, 3);
+}
+
+static inline void end_fw_load(struct i2c_client *client)
+{
+        if (fastfw)
+                set_i2c_delay(client, 10);
+
+        /* AUTO_INC_DIS=0 */
+        cx25840_write(client, 0x000, 0x00);
+        /* DL_ENABLE=0 */
+        cx25840_write(client, 0x803, 0x03);
+}
+
+static inline int check_fw_load(struct i2c_client *client, int size)
+{
+        /* DL_ADDR_HB DL_ADDR_LB */
+        int s = cx25840_read(client, 0x801) << 8;
+        s |= cx25840_read(client, 0x800);
+
+        if (size != s) {
+                cx25840_err("firmware %s load failed\n", firmware);
+                return -EINVAL;
+        }
+
+        cx25840_info("loaded %s firmware (%d bytes)\n", firmware, size);
+        return 0;
+}
+
+static inline int fw_write(struct i2c_client *client, u8 * data, int size)
+{
+        if (i2c_master_send(client, data, size) < size) {
+
+                if (fastfw) {
+                        cx25840_err("333MHz i2c firmware load failed\n");
+                        fastfw = 0;
+                        set_i2c_delay(client, 10);
+
+                        if (i2c_master_send(client, data, size) < size) {
+                                cx25840_err
+                                    ("100MHz i2c firmware load failed\n");
+                                return -ENOSYS;
+                        }
+
+                } else {
+                        cx25840_err("firmware load i2c failure\n");
+                        return -ENOSYS;
+                }
+
+        }
+
+        return 0;
+}
+
+int cx25840_loadfw(struct i2c_client *client)
+{
+        const struct firmware *fw = NULL;
+        u8 buffer[4], *ptr;
+        int size, send, retval;
+
+        if (request_firmware(&fw, firmware, FWDEV(client)) != 0) {
+                cx25840_err("unable to open firmware %s\n", firmware);
+                return -EINVAL;
+        }
+
+        start_fw_load(client);
+
+        buffer[0] = 0x08;
+        buffer[1] = 0x02;
+        buffer[2] = fw->data[0];
+        buffer[3] = fw->data[1];
+        retval = fw_write(client, buffer, 4);
+
+        if (retval < 0) {
+                release_firmware(fw);
+                return retval;
+        }
+
+        size = fw->size - 2;
+        ptr = fw->data;
+        while (size > 0) {
+                ptr[0] = 0x08;
+                ptr[1] = 0x02;
+                send = size > (FWSEND - 2) ? FWSEND : size + 2;
+                retval = fw_write(client, ptr, send);
+
+                if (retval < 0) {
+                        release_firmware(fw);
+                        return retval;
+                }
+
+                size -= FWSEND - 2;
+                ptr += FWSEND - 2;
+        }
+
+        end_fw_load(client);
+
+        size = fw->size;
+        release_firmware(fw);
+
+        return check_fw_load(client, size);
+}