618 lines
15 KiB
C
618 lines
15 KiB
C
/*
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em28xx-i2c.c - driver for Empia EM2800/EM2820/2840 USB video capture devices
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Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
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Markus Rechberger <mrechberger@gmail.com>
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Mauro Carvalho Chehab <mchehab@infradead.org>
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Sascha Sommer <saschasommer@freenet.de>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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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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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., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/usb.h>
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#include <linux/i2c.h>
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#include "em28xx.h"
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#include "tuner-xc2028.h"
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#include <media/v4l2-common.h>
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#include <media/tuner.h>
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/* ----------------------------------------------------------- */
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static unsigned int i2c_scan;
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module_param(i2c_scan, int, 0444);
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MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time");
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static unsigned int i2c_debug;
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module_param(i2c_debug, int, 0644);
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MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");
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/*
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* em2800_i2c_send_bytes()
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* send up to 4 bytes to the em2800 i2c device
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*/
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static int em2800_i2c_send_bytes(struct em28xx *dev, u8 addr, u8 *buf, u16 len)
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{
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int ret;
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int write_timeout;
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u8 b2[6];
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if (len < 1 || len > 4)
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return -EOPNOTSUPP;
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BUG_ON(len < 1 || len > 4);
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b2[5] = 0x80 + len - 1;
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b2[4] = addr;
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b2[3] = buf[0];
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if (len > 1)
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b2[2] = buf[1];
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if (len > 2)
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b2[1] = buf[2];
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if (len > 3)
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b2[0] = buf[3];
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/* trigger write */
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ret = dev->em28xx_write_regs(dev, 4 - len, &b2[4 - len], 2 + len);
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if (ret != 2 + len) {
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em28xx_warn("failed to trigger write to i2c address 0x%x "
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"(error=%i)\n", addr, ret);
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return (ret < 0) ? ret : -EIO;
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}
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/* wait for completion */
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for (write_timeout = EM2800_I2C_XFER_TIMEOUT; write_timeout > 0;
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write_timeout -= 5) {
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ret = dev->em28xx_read_reg(dev, 0x05);
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if (ret == 0x80 + len - 1) {
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return len;
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} else if (ret == 0x94 + len - 1) {
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return -ENODEV;
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} else if (ret < 0) {
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em28xx_warn("failed to get i2c transfer status from "
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"bridge register (error=%i)\n", ret);
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return ret;
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}
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msleep(5);
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}
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em28xx_warn("write to i2c device at 0x%x timed out\n", addr);
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return -EIO;
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}
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/*
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* em2800_i2c_recv_bytes()
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* read up to 4 bytes from the em2800 i2c device
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*/
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static int em2800_i2c_recv_bytes(struct em28xx *dev, u8 addr, u8 *buf, u16 len)
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{
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u8 buf2[4];
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int ret;
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int read_timeout;
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int i;
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if (len < 1 || len > 4)
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return -EOPNOTSUPP;
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/* trigger read */
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buf2[1] = 0x84 + len - 1;
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buf2[0] = addr;
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ret = dev->em28xx_write_regs(dev, 0x04, buf2, 2);
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if (ret != 2) {
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em28xx_warn("failed to trigger read from i2c address 0x%x "
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"(error=%i)\n", addr, ret);
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return (ret < 0) ? ret : -EIO;
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}
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/* wait for completion */
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for (read_timeout = EM2800_I2C_XFER_TIMEOUT; read_timeout > 0;
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read_timeout -= 5) {
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ret = dev->em28xx_read_reg(dev, 0x05);
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if (ret == 0x84 + len - 1) {
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break;
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} else if (ret == 0x94 + len - 1) {
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return -ENODEV;
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} else if (ret < 0) {
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em28xx_warn("failed to get i2c transfer status from "
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"bridge register (error=%i)\n", ret);
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return ret;
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}
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msleep(5);
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}
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if (ret != 0x84 + len - 1)
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em28xx_warn("read from i2c device at 0x%x timed out\n", addr);
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/* get the received message */
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ret = dev->em28xx_read_reg_req_len(dev, 0x00, 4-len, buf2, len);
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if (ret != len) {
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em28xx_warn("reading from i2c device at 0x%x failed: "
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"couldn't get the received message from the bridge "
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"(error=%i)\n", addr, ret);
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return (ret < 0) ? ret : -EIO;
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}
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for (i = 0; i < len; i++)
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buf[i] = buf2[len - 1 - i];
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return ret;
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}
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/*
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* em2800_i2c_check_for_device()
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* check if there is an i2c device at the supplied address
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*/
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static int em2800_i2c_check_for_device(struct em28xx *dev, u8 addr)
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{
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u8 buf;
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int ret;
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ret = em2800_i2c_recv_bytes(dev, addr, &buf, 1);
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if (ret == 1)
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return 0;
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return (ret < 0) ? ret : -EIO;
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}
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/*
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* em28xx_i2c_send_bytes()
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*/
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static int em28xx_i2c_send_bytes(struct em28xx *dev, u16 addr, u8 *buf,
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u16 len, int stop)
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{
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int write_timeout, ret;
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if (len < 1 || len > 64)
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return -EOPNOTSUPP;
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/* NOTE: limited by the USB ctrl message constraints
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* Zero length reads always succeed, even if no device is connected */
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/* Write to i2c device */
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ret = dev->em28xx_write_regs_req(dev, stop ? 2 : 3, addr, buf, len);
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if (ret != len) {
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if (ret < 0) {
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em28xx_warn("writing to i2c device at 0x%x failed "
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"(error=%i)\n", addr, ret);
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return ret;
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} else {
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em28xx_warn("%i bytes write to i2c device at 0x%x "
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"requested, but %i bytes written\n",
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len, addr, ret);
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return -EIO;
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}
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}
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/* Check success of the i2c operation */
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for (write_timeout = EM2800_I2C_XFER_TIMEOUT; write_timeout > 0;
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write_timeout -= 5) {
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ret = dev->em28xx_read_reg(dev, 0x05);
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if (ret == 0) { /* success */
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return len;
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} else if (ret == 0x10) {
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return -ENODEV;
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} else if (ret < 0) {
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em28xx_warn("failed to read i2c transfer status from "
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"bridge (error=%i)\n", ret);
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return ret;
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}
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msleep(5);
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/* NOTE: do we really have to wait for success ?
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Never seen anything else than 0x00 or 0x10
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(even with high payload) ... */
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}
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em28xx_warn("write to i2c device at 0x%x timed out\n", addr);
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return -EIO;
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}
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/*
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* em28xx_i2c_recv_bytes()
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* read a byte from the i2c device
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*/
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static int em28xx_i2c_recv_bytes(struct em28xx *dev, u16 addr, u8 *buf, u16 len)
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{
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int ret;
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if (len < 1 || len > 64)
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return -EOPNOTSUPP;
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/* NOTE: limited by the USB ctrl message constraints
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* Zero length reads always succeed, even if no device is connected */
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/* Read data from i2c device */
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ret = dev->em28xx_read_reg_req_len(dev, 2, addr, buf, len);
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if (ret != len) {
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if (ret < 0) {
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em28xx_warn("reading from i2c device at 0x%x failed "
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"(error=%i)\n", addr, ret);
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return ret;
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} else {
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em28xx_warn("%i bytes requested from i2c device at "
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"0x%x, but %i bytes received\n",
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len, addr, ret);
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return -EIO;
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}
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}
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/* Check success of the i2c operation */
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ret = dev->em28xx_read_reg(dev, 0x05);
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if (ret < 0) {
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em28xx_warn("failed to read i2c transfer status from "
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"bridge (error=%i)\n", ret);
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return ret;
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}
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if (ret > 0) {
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if (ret == 0x10) {
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return -ENODEV;
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} else {
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em28xx_warn("unknown i2c error (status=%i)\n", ret);
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return -EIO;
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}
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}
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return len;
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}
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/*
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* em28xx_i2c_check_for_device()
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* check if there is a i2c_device at the supplied address
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*/
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static int em28xx_i2c_check_for_device(struct em28xx *dev, u16 addr)
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{
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int ret;
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u8 buf;
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ret = em28xx_i2c_recv_bytes(dev, addr, &buf, 1);
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if (ret == 1)
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return 0;
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return (ret < 0) ? ret : -EIO;
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}
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/*
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* em28xx_i2c_xfer()
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* the main i2c transfer function
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*/
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static int em28xx_i2c_xfer(struct i2c_adapter *i2c_adap,
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struct i2c_msg msgs[], int num)
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{
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struct em28xx *dev = i2c_adap->algo_data;
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int addr, rc, i, byte;
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if (num <= 0)
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return 0;
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for (i = 0; i < num; i++) {
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addr = msgs[i].addr << 1;
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if (i2c_debug)
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printk(KERN_DEBUG "%s at %s: %s %s addr=%02x len=%d:",
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dev->name, __func__ ,
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(msgs[i].flags & I2C_M_RD) ? "read" : "write",
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i == num - 1 ? "stop" : "nonstop",
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addr, msgs[i].len);
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if (!msgs[i].len) { /* no len: check only for device presence */
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if (dev->board.is_em2800)
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rc = em2800_i2c_check_for_device(dev, addr);
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else
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rc = em28xx_i2c_check_for_device(dev, addr);
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if (rc == -ENODEV) {
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if (i2c_debug)
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printk(" no device\n");
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return rc;
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}
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} else if (msgs[i].flags & I2C_M_RD) {
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/* read bytes */
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if (dev->board.is_em2800)
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rc = em2800_i2c_recv_bytes(dev, addr,
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msgs[i].buf,
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msgs[i].len);
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else
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rc = em28xx_i2c_recv_bytes(dev, addr,
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msgs[i].buf,
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msgs[i].len);
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if (i2c_debug) {
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for (byte = 0; byte < msgs[i].len; byte++)
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printk(" %02x", msgs[i].buf[byte]);
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}
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} else {
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/* write bytes */
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if (i2c_debug) {
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for (byte = 0; byte < msgs[i].len; byte++)
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printk(" %02x", msgs[i].buf[byte]);
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}
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if (dev->board.is_em2800)
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rc = em2800_i2c_send_bytes(dev, addr,
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msgs[i].buf,
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msgs[i].len);
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else
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rc = em28xx_i2c_send_bytes(dev, addr,
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msgs[i].buf,
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msgs[i].len,
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i == num - 1);
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}
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if (rc < 0) {
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if (i2c_debug)
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printk(" ERROR: %i\n", rc);
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return rc;
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}
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if (i2c_debug)
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printk("\n");
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}
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return num;
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}
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/* based on linux/sunrpc/svcauth.h and linux/hash.h
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* The original hash function returns a different value, if arch is x86_64
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* or i386.
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*/
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static inline unsigned long em28xx_hash_mem(char *buf, int length, int bits)
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{
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unsigned long hash = 0;
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unsigned long l = 0;
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int len = 0;
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unsigned char c;
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do {
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if (len == length) {
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c = (char)len;
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len = -1;
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} else
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c = *buf++;
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l = (l << 8) | c;
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len++;
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if ((len & (32 / 8 - 1)) == 0)
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hash = ((hash^l) * 0x9e370001UL);
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} while (len);
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return (hash >> (32 - bits)) & 0xffffffffUL;
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}
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static int em28xx_i2c_eeprom(struct em28xx *dev, unsigned char *eedata, int len)
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{
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unsigned char buf, *p = eedata;
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struct em28xx_eeprom *em_eeprom = (void *)eedata;
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int i, err, size = len, block, block_max;
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if (dev->chip_id == CHIP_ID_EM2874 ||
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dev->chip_id == CHIP_ID_EM28174 ||
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dev->chip_id == CHIP_ID_EM2884) {
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/* Empia switched to a 16-bit addressable eeprom in newer
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devices. While we could certainly write a routine to read
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the eeprom, there is nothing of use in there that cannot be
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accessed through registers, and there is the risk that we
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could corrupt the eeprom (since a 16-bit read call is
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interpreted as a write call by 8-bit eeproms).
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*/
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return 0;
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}
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dev->i2c_client.addr = 0xa0 >> 1;
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/* Check if board has eeprom */
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err = i2c_master_recv(&dev->i2c_client, &buf, 0);
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if (err < 0) {
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em28xx_info("board has no eeprom\n");
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memset(eedata, 0, len);
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return -ENODEV;
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}
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buf = 0;
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err = i2c_master_send(&dev->i2c_client, &buf, 1);
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if (err != 1) {
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em28xx_errdev("failed to read eeprom (err=%d)\n", err);
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return err;
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}
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if (dev->board.is_em2800)
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block_max = 4;
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else
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block_max = 64;
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while (size > 0) {
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if (size > block_max)
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block = block_max;
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else
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block = size;
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if (block !=
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(err = i2c_master_recv(&dev->i2c_client, p, block))) {
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em28xx_errdev("i2c eeprom read error (err=%d)\n", err);
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return err;
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}
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size -= block;
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p += block;
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}
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for (i = 0; i < len; i++) {
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if (0 == (i % 16))
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em28xx_info("i2c eeprom %02x:", i);
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printk(" %02x", eedata[i]);
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if (15 == (i % 16))
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printk("\n");
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}
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if (em_eeprom->id == 0x9567eb1a)
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dev->hash = em28xx_hash_mem(eedata, len, 32);
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em28xx_info("EEPROM ID = 0x%08x, EEPROM hash = 0x%08lx\n",
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em_eeprom->id, dev->hash);
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em28xx_info("EEPROM info:\n");
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switch (em_eeprom->chip_conf >> 4 & 0x3) {
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case 0:
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em28xx_info("\tNo audio on board.\n");
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break;
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case 1:
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em28xx_info("\tAC97 audio (5 sample rates)\n");
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break;
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case 2:
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em28xx_info("\tI2S audio, sample rate=32k\n");
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break;
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case 3:
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em28xx_info("\tI2S audio, 3 sample rates\n");
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break;
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}
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if (em_eeprom->chip_conf & 1 << 3)
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em28xx_info("\tUSB Remote wakeup capable\n");
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if (em_eeprom->chip_conf & 1 << 2)
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em28xx_info("\tUSB Self power capable\n");
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switch (em_eeprom->chip_conf & 0x3) {
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case 0:
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em28xx_info("\t500mA max power\n");
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break;
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case 1:
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em28xx_info("\t400mA max power\n");
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break;
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case 2:
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em28xx_info("\t300mA max power\n");
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break;
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case 3:
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em28xx_info("\t200mA max power\n");
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break;
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}
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em28xx_info("\tTable at offset 0x%02x, strings=0x%04x, 0x%04x, 0x%04x\n",
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em_eeprom->string_idx_table,
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em_eeprom->string1,
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em_eeprom->string2,
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em_eeprom->string3);
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return 0;
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}
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/* ----------------------------------------------------------- */
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/*
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* functionality()
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*/
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static u32 functionality(struct i2c_adapter *adap)
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{
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struct em28xx *dev = adap->algo_data;
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u32 func_flags = I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
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if (dev->board.is_em2800)
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func_flags &= ~I2C_FUNC_SMBUS_WRITE_BLOCK_DATA;
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return func_flags;
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}
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static struct i2c_algorithm em28xx_algo = {
|
|
.master_xfer = em28xx_i2c_xfer,
|
|
.functionality = functionality,
|
|
};
|
|
|
|
static struct i2c_adapter em28xx_adap_template = {
|
|
.owner = THIS_MODULE,
|
|
.name = "em28xx",
|
|
.algo = &em28xx_algo,
|
|
};
|
|
|
|
static struct i2c_client em28xx_client_template = {
|
|
.name = "em28xx internal",
|
|
};
|
|
|
|
/* ----------------------------------------------------------- */
|
|
|
|
/*
|
|
* i2c_devs
|
|
* incomplete list of known devices
|
|
*/
|
|
static char *i2c_devs[128] = {
|
|
[0x3e >> 1] = "remote IR sensor",
|
|
[0x4a >> 1] = "saa7113h",
|
|
[0x52 >> 1] = "drxk",
|
|
[0x60 >> 1] = "remote IR sensor",
|
|
[0x8e >> 1] = "remote IR sensor",
|
|
[0x86 >> 1] = "tda9887",
|
|
[0x80 >> 1] = "msp34xx",
|
|
[0x88 >> 1] = "msp34xx",
|
|
[0xa0 >> 1] = "eeprom",
|
|
[0xb0 >> 1] = "tda9874",
|
|
[0xb8 >> 1] = "tvp5150a",
|
|
[0xba >> 1] = "webcam sensor or tvp5150a",
|
|
[0xc0 >> 1] = "tuner (analog)",
|
|
[0xc2 >> 1] = "tuner (analog)",
|
|
[0xc4 >> 1] = "tuner (analog)",
|
|
[0xc6 >> 1] = "tuner (analog)",
|
|
};
|
|
|
|
/*
|
|
* do_i2c_scan()
|
|
* check i2c address range for devices
|
|
*/
|
|
void em28xx_do_i2c_scan(struct em28xx *dev)
|
|
{
|
|
u8 i2c_devicelist[128];
|
|
unsigned char buf;
|
|
int i, rc;
|
|
|
|
memset(i2c_devicelist, 0, ARRAY_SIZE(i2c_devicelist));
|
|
|
|
for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) {
|
|
dev->i2c_client.addr = i;
|
|
rc = i2c_master_recv(&dev->i2c_client, &buf, 0);
|
|
if (rc < 0)
|
|
continue;
|
|
i2c_devicelist[i] = i;
|
|
em28xx_info("found i2c device @ 0x%x [%s]\n",
|
|
i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
|
|
}
|
|
|
|
dev->i2c_hash = em28xx_hash_mem(i2c_devicelist,
|
|
ARRAY_SIZE(i2c_devicelist), 32);
|
|
}
|
|
|
|
/*
|
|
* em28xx_i2c_register()
|
|
* register i2c bus
|
|
*/
|
|
int em28xx_i2c_register(struct em28xx *dev)
|
|
{
|
|
int retval;
|
|
|
|
BUG_ON(!dev->em28xx_write_regs || !dev->em28xx_read_reg);
|
|
BUG_ON(!dev->em28xx_write_regs_req || !dev->em28xx_read_reg_req);
|
|
dev->i2c_adap = em28xx_adap_template;
|
|
dev->i2c_adap.dev.parent = &dev->udev->dev;
|
|
strcpy(dev->i2c_adap.name, dev->name);
|
|
dev->i2c_adap.algo_data = dev;
|
|
i2c_set_adapdata(&dev->i2c_adap, &dev->v4l2_dev);
|
|
|
|
retval = i2c_add_adapter(&dev->i2c_adap);
|
|
if (retval < 0) {
|
|
em28xx_errdev("%s: i2c_add_adapter failed! retval [%d]\n",
|
|
__func__, retval);
|
|
return retval;
|
|
}
|
|
|
|
dev->i2c_client = em28xx_client_template;
|
|
dev->i2c_client.adapter = &dev->i2c_adap;
|
|
|
|
retval = em28xx_i2c_eeprom(dev, dev->eedata, sizeof(dev->eedata));
|
|
if ((retval < 0) && (retval != -ENODEV)) {
|
|
em28xx_errdev("%s: em28xx_i2_eeprom failed! retval [%d]\n",
|
|
__func__, retval);
|
|
|
|
return retval;
|
|
}
|
|
|
|
if (i2c_scan)
|
|
em28xx_do_i2c_scan(dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* em28xx_i2c_unregister()
|
|
* unregister i2c_bus
|
|
*/
|
|
int em28xx_i2c_unregister(struct em28xx *dev)
|
|
{
|
|
i2c_del_adapter(&dev->i2c_adap);
|
|
return 0;
|
|
}
|