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d55c7aec66
Due to changes in the i2c handling in 2.6.20 this cx25840 bug surfaced, causing the firmware load to fail for the ivtv driver. The correct sequence is to first attach the i2c client, then use the client's device to load the firmware. Acked-by: Mike Isely <isely@pobox.com> Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
142 lines
3.5 KiB
C
142 lines
3.5 KiB
C
/* cx25840 firmware functions
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <linux/module.h>
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#include <linux/i2c.h>
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#include <linux/i2c-algo-bit.h>
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#include <linux/firmware.h>
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#include <media/v4l2-common.h>
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#include <media/cx25840.h>
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#include "cx25840-core.h"
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#define FWFILE "v4l-cx25840.fw"
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/*
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* Mike Isely <isely@pobox.com> - The FWSEND parameter controls the
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* size of the firmware chunks sent down the I2C bus to the chip.
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* Previously this had been set to 1024 but unfortunately some I2C
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* implementations can't transfer data in such big gulps.
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* Specifically, the pvrusb2 driver has a hard limit of around 60
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* bytes, due to the encapsulation there of I2C traffic into USB
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* messages. So we have to significantly reduce this parameter.
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*/
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#define FWSEND 48
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#define FWDEV(x) &((x)->dev)
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static char *firmware = FWFILE;
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module_param(firmware, charp, 0444);
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MODULE_PARM_DESC(firmware, "Firmware image [default: " FWFILE "]");
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static void start_fw_load(struct i2c_client *client)
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{
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/* DL_ADDR_LB=0 DL_ADDR_HB=0 */
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cx25840_write(client, 0x800, 0x00);
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cx25840_write(client, 0x801, 0x00);
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// DL_MAP=3 DL_AUTO_INC=0 DL_ENABLE=1
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cx25840_write(client, 0x803, 0x0b);
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/* AUTO_INC_DIS=1 */
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cx25840_write(client, 0x000, 0x20);
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}
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static void end_fw_load(struct i2c_client *client)
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{
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/* AUTO_INC_DIS=0 */
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cx25840_write(client, 0x000, 0x00);
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/* DL_ENABLE=0 */
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cx25840_write(client, 0x803, 0x03);
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}
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static int check_fw_load(struct i2c_client *client, int size)
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{
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/* DL_ADDR_HB DL_ADDR_LB */
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int s = cx25840_read(client, 0x801) << 8;
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s |= cx25840_read(client, 0x800);
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if (size != s) {
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v4l_err(client, "firmware %s load failed\n", firmware);
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return -EINVAL;
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}
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v4l_info(client, "loaded %s firmware (%d bytes)\n", firmware, size);
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return 0;
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}
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static int fw_write(struct i2c_client *client, u8 * data, int size)
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{
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int sent;
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if ((sent = i2c_master_send(client, data, size)) < size) {
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v4l_err(client, "firmware load i2c failure\n");
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return -ENOSYS;
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}
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return 0;
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}
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int cx25840_loadfw(struct i2c_client *client)
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{
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const struct firmware *fw = NULL;
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u8 buffer[4], *ptr;
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int size, send, retval;
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if (request_firmware(&fw, firmware, FWDEV(client)) != 0) {
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v4l_err(client, "unable to open firmware %s\n", firmware);
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return -EINVAL;
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}
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start_fw_load(client);
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buffer[0] = 0x08;
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buffer[1] = 0x02;
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buffer[2] = fw->data[0];
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buffer[3] = fw->data[1];
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retval = fw_write(client, buffer, 4);
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if (retval < 0) {
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release_firmware(fw);
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return retval;
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}
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size = fw->size - 2;
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ptr = fw->data;
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while (size > 0) {
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ptr[0] = 0x08;
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ptr[1] = 0x02;
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send = size > (FWSEND - 2) ? FWSEND : size + 2;
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retval = fw_write(client, ptr, send);
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if (retval < 0) {
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release_firmware(fw);
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return retval;
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}
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size -= FWSEND - 2;
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ptr += FWSEND - 2;
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}
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end_fw_load(client);
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size = fw->size;
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release_firmware(fw);
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return check_fw_load(client, size);
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}
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