This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / drivers / media / video / cx25840 / cx25840-firmware.c

diff --git a/drivers/media/video/cx25840/cx25840-firmware.c b/drivers/media/video/cx25840/cx25840-firmware.c
new file mode 100644 (file)
index 0000000..1958d40
--- /dev/null
+++ b/drivers/media/video/cx25840/cx25840-firmware.c
@@ -0,0 +1,141 @@
+/* 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 <media/cx25840.h>
+
+#include "cx25840-core.h"
+
+#define FWFILE "v4l-cx25840.fw"
+
+/*
+ * Mike Isely <isely@pobox.com> - The FWSEND parameter controls the
+ * size of the firmware chunks sent down the I2C bus to the chip.
+ * Previously this had been set to 1024 but unfortunately some I2C
+ * implementations can't transfer data in such big gulps.
+ * Specifically, the pvrusb2 driver has a hard limit of around 60
+ * bytes, due to the encapsulation there of I2C traffic into USB
+ * messages.  So we have to significantly reduce this parameter.
+ */
+#define FWSEND 48
+
+#define FWDEV(x) &((x)->adapter->dev)
+
+static char *firmware = FWFILE;
+
+module_param(firmware, charp, 0444);
+
+MODULE_PARM_DESC(firmware, "Firmware image [default: " FWFILE "]");
+
+static 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);
+}
+
+static void end_fw_load(struct i2c_client *client)
+{
+       /* AUTO_INC_DIS=0 */
+       cx25840_write(client, 0x000, 0x00);
+       /* DL_ENABLE=0 */
+       cx25840_write(client, 0x803, 0x03);
+}
+
+static 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) {
+               v4l_err(client, "firmware %s load failed\n", firmware);
+               return -EINVAL;
+       }
+
+       v4l_info(client, "loaded %s firmware (%d bytes)\n", firmware, size);
+       return 0;
+}
+
+static int fw_write(struct i2c_client *client, u8 * data, int size)
+{
+       int sent;
+
+       if ((sent = i2c_master_send(client, data, size)) < size) {
+               v4l_err(client, "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) {
+               v4l_err(client, "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);
+}