1036 lines
26 KiB
C
1036 lines
26 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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//
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// em28xx-i2c.c - driver for Empia EM2800/EM2820/2840 USB video capture devices
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//
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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@kernel.org>
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// Sascha Sommer <saschasommer@freenet.de>
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// Copyright (C) 2013 Frank Schäfer <fschaefer.oss@googlemail.com>
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//
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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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//
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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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#include "em28xx.h"
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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 <linux/jiffies.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, "i2c debug message level (1: normal debug, 2: show I2C transfers)");
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#define dprintk(level, fmt, arg...) do { \
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if (i2c_debug > level) \
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dev_printk(KERN_DEBUG, &dev->intf->dev, \
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"i2c: %s: " fmt, __func__, ## arg); \
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} while (0)
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/*
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* Time in msecs to wait for i2c xfers to finish.
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* 35ms is the maximum time a SMBUS device could wait when
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* clock stretching is used. As the transfer itself will take
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* some time to happen, set it to 35 ms.
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*
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* Ok, I2C doesn't specify any limit. So, eventually, we may need
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* to increase this timeout.
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*/
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#define EM28XX_I2C_XFER_TIMEOUT 35 /* ms */
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static int em28xx_i2c_timeout(struct em28xx *dev)
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{
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int time = EM28XX_I2C_XFER_TIMEOUT;
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switch (dev->i2c_speed & 0x03) {
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case EM28XX_I2C_FREQ_25_KHZ:
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time += 4; /* Assume 4 ms for transfers */
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break;
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case EM28XX_I2C_FREQ_100_KHZ:
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case EM28XX_I2C_FREQ_400_KHZ:
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time += 1; /* Assume 1 ms for transfers */
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break;
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default: /* EM28XX_I2C_FREQ_1_5_MHZ */
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break;
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}
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return msecs_to_jiffies(time);
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}
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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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unsigned long timeout = jiffies + em28xx_i2c_timeout(dev);
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int ret;
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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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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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dev_warn(&dev->intf->dev,
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"failed to trigger write to i2c address 0x%x (error=%i)\n",
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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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while (time_is_after_jiffies(timeout)) {
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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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if (ret == 0x94 + len - 1) {
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dprintk(1, "R05 returned 0x%02x: I2C ACK error\n", ret);
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return -ENXIO;
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}
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if (ret < 0) {
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dev_warn(&dev->intf->dev,
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"failed to get i2c transfer status from bridge register (error=%i)\n",
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ret);
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return ret;
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}
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usleep_range(5000, 6000);
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}
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dprintk(0, "write to i2c device at 0x%x timed out\n", addr);
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return -ETIMEDOUT;
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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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unsigned long timeout = jiffies + em28xx_i2c_timeout(dev);
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u8 buf2[4];
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int ret;
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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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dev_warn(&dev->intf->dev,
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"failed to trigger read from i2c address 0x%x (error=%i)\n",
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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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while (time_is_after_jiffies(timeout)) {
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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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if (ret == 0x94 + len - 1) {
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dprintk(1, "R05 returned 0x%02x: I2C ACK error\n",
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ret);
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return -ENXIO;
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}
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if (ret < 0) {
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dev_warn(&dev->intf->dev,
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"failed to get i2c transfer status from bridge register (error=%i)\n",
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ret);
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return ret;
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}
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usleep_range(5000, 6000);
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}
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if (ret != 0x84 + len - 1)
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dprintk(0, "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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dev_warn(&dev->intf->dev,
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"reading from i2c device at 0x%x failed: couldn't get the received message from the bridge (error=%i)\n",
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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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unsigned long timeout = jiffies + em28xx_i2c_timeout(dev);
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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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/*
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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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*/
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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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dev_warn(&dev->intf->dev,
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"writing to i2c device at 0x%x failed (error=%i)\n",
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addr, ret);
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return ret;
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}
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dev_warn(&dev->intf->dev,
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"%i bytes write to i2c device at 0x%x 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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/* wait for completion */
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while (time_is_after_jiffies(timeout)) {
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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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if (ret == 0x10) {
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dprintk(1, "I2C ACK error on writing to addr 0x%02x\n",
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addr);
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return -ENXIO;
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}
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if (ret < 0) {
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dev_warn(&dev->intf->dev,
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"failed to get i2c transfer status from bridge register (error=%i)\n",
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ret);
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return ret;
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}
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usleep_range(5000, 6000);
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/*
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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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}
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if (ret == 0x02 || ret == 0x04) {
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/* NOTE: these errors seem to be related to clock stretching */
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dprintk(0,
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"write to i2c device at 0x%x timed out (status=%i)\n",
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addr, ret);
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return -ETIMEDOUT;
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}
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dev_warn(&dev->intf->dev,
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"write to i2c device at 0x%x failed with unknown error (status=%i)\n",
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addr, ret);
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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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/*
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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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*/
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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 < 0) {
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dev_warn(&dev->intf->dev,
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"reading from i2c device at 0x%x failed (error=%i)\n",
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addr, ret);
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return ret;
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}
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/*
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* NOTE: some devices with two i2c buses have the bad habit to return 0
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* bytes if we are on bus B AND there was no write attempt to the
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* specified slave address before AND no device is present at the
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* requested slave address.
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* Anyway, the next check will fail with -ENXIO in this case, so avoid
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* spamming the system log on device probing and do nothing here.
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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) /* success */
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return len;
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if (ret < 0) {
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dev_warn(&dev->intf->dev,
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"failed to get i2c transfer status from bridge register (error=%i)\n",
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ret);
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return ret;
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}
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if (ret == 0x10) {
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dprintk(1, "I2C ACK error on writing to addr 0x%02x\n",
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addr);
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return -ENXIO;
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}
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if (ret == 0x02 || ret == 0x04) {
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/* NOTE: these errors seem to be related to clock stretching */
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dprintk(0,
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"write to i2c device at 0x%x timed out (status=%i)\n",
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addr, ret);
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return -ETIMEDOUT;
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}
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dev_warn(&dev->intf->dev,
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"write to i2c device at 0x%x failed with unknown error (status=%i)\n",
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addr, ret);
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return -EIO;
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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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* em25xx_bus_B_send_bytes
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* write bytes to the i2c device
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*/
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static int em25xx_bus_B_send_bytes(struct em28xx *dev, u16 addr, u8 *buf,
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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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/*
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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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*/
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/* Set register and write value */
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ret = dev->em28xx_write_regs_req(dev, 0x06, addr, buf, len);
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if (ret != len) {
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if (ret < 0) {
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dev_warn(&dev->intf->dev,
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"writing to i2c device at 0x%x failed (error=%i)\n",
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addr, ret);
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return ret;
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}
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dev_warn(&dev->intf->dev,
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"%i bytes write to i2c device at 0x%x 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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/* Check success */
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ret = dev->em28xx_read_reg_req(dev, 0x08, 0x0000);
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/*
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* NOTE: the only error we've seen so far is
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* 0x01 when the slave device is not present
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*/
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if (!ret)
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return len;
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if (ret > 0) {
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dprintk(1, "Bus B R08 returned 0x%02x: I2C ACK error\n", ret);
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return -ENXIO;
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}
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return ret;
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/*
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* NOTE: With chip types (other chip IDs) which actually don't support
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* this operation, it seems to succeed ALWAYS ! (even if there is no
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* slave device or even no second i2c bus provided)
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*/
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}
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/*
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* em25xx_bus_B_recv_bytes
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* read bytes from the i2c device
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*/
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static int em25xx_bus_B_recv_bytes(struct em28xx *dev, u16 addr, u8 *buf,
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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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/*
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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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*/
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/* Read value */
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ret = dev->em28xx_read_reg_req_len(dev, 0x06, addr, buf, len);
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if (ret < 0) {
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dev_warn(&dev->intf->dev,
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"reading from i2c device at 0x%x failed (error=%i)\n",
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addr, ret);
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return ret;
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}
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/*
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* NOTE: some devices with two i2c buses have the bad habit to return 0
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* bytes if we are on bus B AND there was no write attempt to the
|
|
* specified slave address before AND no device is present at the
|
|
* requested slave address.
|
|
* Anyway, the next check will fail with -ENXIO in this case, so avoid
|
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* spamming the system log on device probing and do nothing here.
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*/
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/* Check success */
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ret = dev->em28xx_read_reg_req(dev, 0x08, 0x0000);
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/*
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* NOTE: the only error we've seen so far is
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* 0x01 when the slave device is not present
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*/
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if (!ret)
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return len;
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if (ret > 0) {
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dprintk(1, "Bus B R08 returned 0x%02x: I2C ACK error\n", ret);
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return -ENXIO;
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}
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return ret;
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/*
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|
* NOTE: With chip types (other chip IDs) which actually don't support
|
|
* this operation, it seems to succeed ALWAYS ! (even if there is no
|
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* slave device or even no second i2c bus provided)
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*/
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}
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/*
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* em25xx_bus_B_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 em25xx_bus_B_check_for_device(struct em28xx *dev, u16 addr)
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{
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u8 buf;
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int ret;
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ret = em25xx_bus_B_recv_bytes(dev, addr, &buf, 1);
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if (ret < 0)
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return ret;
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return 0;
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/*
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* NOTE: With chips which do not support this operation,
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* it seems to succeed ALWAYS ! (even if no device connected)
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*/
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}
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static inline int i2c_check_for_device(struct em28xx_i2c_bus *i2c_bus, u16 addr)
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{
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struct em28xx *dev = i2c_bus->dev;
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int rc = -EOPNOTSUPP;
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if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM28XX)
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rc = em28xx_i2c_check_for_device(dev, addr);
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else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM2800)
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rc = em2800_i2c_check_for_device(dev, addr);
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else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM25XX_BUS_B)
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rc = em25xx_bus_B_check_for_device(dev, addr);
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return rc;
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}
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static inline int i2c_recv_bytes(struct em28xx_i2c_bus *i2c_bus,
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struct i2c_msg msg)
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{
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struct em28xx *dev = i2c_bus->dev;
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u16 addr = msg.addr << 1;
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int rc = -EOPNOTSUPP;
|
|
|
|
if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM28XX)
|
|
rc = em28xx_i2c_recv_bytes(dev, addr, msg.buf, msg.len);
|
|
else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM2800)
|
|
rc = em2800_i2c_recv_bytes(dev, addr, msg.buf, msg.len);
|
|
else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM25XX_BUS_B)
|
|
rc = em25xx_bus_B_recv_bytes(dev, addr, msg.buf, msg.len);
|
|
return rc;
|
|
}
|
|
|
|
static inline int i2c_send_bytes(struct em28xx_i2c_bus *i2c_bus,
|
|
struct i2c_msg msg, int stop)
|
|
{
|
|
struct em28xx *dev = i2c_bus->dev;
|
|
u16 addr = msg.addr << 1;
|
|
int rc = -EOPNOTSUPP;
|
|
|
|
if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM28XX)
|
|
rc = em28xx_i2c_send_bytes(dev, addr, msg.buf, msg.len, stop);
|
|
else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM2800)
|
|
rc = em2800_i2c_send_bytes(dev, addr, msg.buf, msg.len);
|
|
else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM25XX_BUS_B)
|
|
rc = em25xx_bus_B_send_bytes(dev, addr, msg.buf, msg.len);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* em28xx_i2c_xfer()
|
|
* the main i2c transfer function
|
|
*/
|
|
static int em28xx_i2c_xfer(struct i2c_adapter *i2c_adap,
|
|
struct i2c_msg msgs[], int num)
|
|
{
|
|
struct em28xx_i2c_bus *i2c_bus = i2c_adap->algo_data;
|
|
struct em28xx *dev = i2c_bus->dev;
|
|
unsigned int bus = i2c_bus->bus;
|
|
int addr, rc, i;
|
|
u8 reg;
|
|
|
|
/*
|
|
* prevent i2c xfer attempts after device is disconnected
|
|
* some fe's try to do i2c writes/reads from their release
|
|
* interfaces when called in disconnect path
|
|
*/
|
|
if (dev->disconnected)
|
|
return -ENODEV;
|
|
|
|
if (!rt_mutex_trylock(&dev->i2c_bus_lock))
|
|
return -EAGAIN;
|
|
|
|
/* Switch I2C bus if needed */
|
|
if (bus != dev->cur_i2c_bus &&
|
|
i2c_bus->algo_type == EM28XX_I2C_ALGO_EM28XX) {
|
|
if (bus == 1)
|
|
reg = EM2874_I2C_SECONDARY_BUS_SELECT;
|
|
else
|
|
reg = 0;
|
|
em28xx_write_reg_bits(dev, EM28XX_R06_I2C_CLK, reg,
|
|
EM2874_I2C_SECONDARY_BUS_SELECT);
|
|
dev->cur_i2c_bus = bus;
|
|
}
|
|
|
|
for (i = 0; i < num; i++) {
|
|
addr = msgs[i].addr << 1;
|
|
if (!msgs[i].len) {
|
|
/*
|
|
* no len: check only for device presence
|
|
* This code is only called during device probe.
|
|
*/
|
|
rc = i2c_check_for_device(i2c_bus, addr);
|
|
|
|
if (rc == -ENXIO)
|
|
rc = -ENODEV;
|
|
} else if (msgs[i].flags & I2C_M_RD) {
|
|
/* read bytes */
|
|
rc = i2c_recv_bytes(i2c_bus, msgs[i]);
|
|
} else {
|
|
/* write bytes */
|
|
rc = i2c_send_bytes(i2c_bus, msgs[i], i == num - 1);
|
|
}
|
|
|
|
if (rc < 0)
|
|
goto error;
|
|
|
|
dprintk(2, "%s %s addr=%02x len=%d: %*ph\n",
|
|
(msgs[i].flags & I2C_M_RD) ? "read" : "write",
|
|
i == num - 1 ? "stop" : "nonstop",
|
|
addr, msgs[i].len,
|
|
msgs[i].len, msgs[i].buf);
|
|
}
|
|
|
|
rt_mutex_unlock(&dev->i2c_bus_lock);
|
|
return num;
|
|
|
|
error:
|
|
dprintk(2, "%s %s addr=%02x len=%d: %sERROR: %i\n",
|
|
(msgs[i].flags & I2C_M_RD) ? "read" : "write",
|
|
i == num - 1 ? "stop" : "nonstop",
|
|
addr, msgs[i].len,
|
|
(rc == -ENODEV) ? "no device " : "",
|
|
rc);
|
|
|
|
rt_mutex_unlock(&dev->i2c_bus_lock);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* based on linux/sunrpc/svcauth.h and linux/hash.h
|
|
* The original hash function returns a different value, if arch is x86_64
|
|
* or i386.
|
|
*/
|
|
static inline unsigned long em28xx_hash_mem(char *buf, int length, int bits)
|
|
{
|
|
unsigned long hash = 0;
|
|
unsigned long l = 0;
|
|
int len = 0;
|
|
unsigned char c;
|
|
|
|
do {
|
|
if (len == length) {
|
|
c = (char)len;
|
|
len = -1;
|
|
} else {
|
|
c = *buf++;
|
|
}
|
|
l = (l << 8) | c;
|
|
len++;
|
|
if ((len & (32 / 8 - 1)) == 0)
|
|
hash = ((hash ^ l) * 0x9e370001UL);
|
|
} while (len);
|
|
|
|
return (hash >> (32 - bits)) & 0xffffffffUL;
|
|
}
|
|
|
|
/*
|
|
* Helper function to read data blocks from i2c clients with 8 or 16 bit
|
|
* address width, 8 bit register width and auto incrementation been activated
|
|
*/
|
|
static int em28xx_i2c_read_block(struct em28xx *dev, unsigned int bus, u16 addr,
|
|
bool addr_w16, u16 len, u8 *data)
|
|
{
|
|
int remain = len, rsize, rsize_max, ret;
|
|
u8 buf[2];
|
|
|
|
/* Sanity check */
|
|
if (addr + remain > (addr_w16 * 0xff00 + 0xff + 1))
|
|
return -EINVAL;
|
|
/* Select address */
|
|
buf[0] = addr >> 8;
|
|
buf[1] = addr & 0xff;
|
|
ret = i2c_master_send(&dev->i2c_client[bus],
|
|
buf + !addr_w16, 1 + addr_w16);
|
|
if (ret < 0)
|
|
return ret;
|
|
/* Read data */
|
|
if (dev->board.is_em2800)
|
|
rsize_max = 4;
|
|
else
|
|
rsize_max = 64;
|
|
while (remain > 0) {
|
|
if (remain > rsize_max)
|
|
rsize = rsize_max;
|
|
else
|
|
rsize = remain;
|
|
|
|
ret = i2c_master_recv(&dev->i2c_client[bus], data, rsize);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
remain -= rsize;
|
|
data += rsize;
|
|
}
|
|
|
|
return len;
|
|
}
|
|
|
|
static int em28xx_i2c_eeprom(struct em28xx *dev, unsigned int bus,
|
|
u8 **eedata, u16 *eedata_len)
|
|
{
|
|
const u16 len = 256;
|
|
/*
|
|
* FIXME common length/size for bytes to read, to display, hash
|
|
* calculation and returned device dataset. Simplifies the code a lot,
|
|
* but we might have to deal with multiple sizes in the future !
|
|
*/
|
|
int err;
|
|
struct em28xx_eeprom *dev_config;
|
|
u8 buf, *data;
|
|
|
|
*eedata = NULL;
|
|
*eedata_len = 0;
|
|
|
|
/* EEPROM is always on i2c bus 0 on all known devices. */
|
|
|
|
dev->i2c_client[bus].addr = 0xa0 >> 1;
|
|
|
|
/* Check if board has eeprom */
|
|
err = i2c_master_recv(&dev->i2c_client[bus], &buf, 0);
|
|
if (err < 0) {
|
|
dev_info(&dev->intf->dev, "board has no eeprom\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
data = kzalloc(len, GFP_KERNEL);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
/* Read EEPROM content */
|
|
err = em28xx_i2c_read_block(dev, bus, 0x0000,
|
|
dev->eeprom_addrwidth_16bit,
|
|
len, data);
|
|
if (err != len) {
|
|
dev_err(&dev->intf->dev,
|
|
"failed to read eeprom (err=%d)\n", err);
|
|
goto error;
|
|
}
|
|
|
|
if (i2c_debug) {
|
|
/* Display eeprom content */
|
|
print_hex_dump(KERN_DEBUG, "em28xx eeprom ", DUMP_PREFIX_OFFSET,
|
|
16, 1, data, len, true);
|
|
|
|
if (dev->eeprom_addrwidth_16bit)
|
|
dev_info(&dev->intf->dev,
|
|
"eeprom %06x: ... (skipped)\n", 256);
|
|
}
|
|
|
|
if (dev->eeprom_addrwidth_16bit &&
|
|
data[0] == 0x26 && data[3] == 0x00) {
|
|
/* new eeprom format; size 4-64kb */
|
|
u16 mc_start;
|
|
u16 hwconf_offset;
|
|
|
|
dev->hash = em28xx_hash_mem(data, len, 32);
|
|
mc_start = (data[1] << 8) + 4; /* usually 0x0004 */
|
|
|
|
dev_info(&dev->intf->dev,
|
|
"EEPROM ID = %4ph, EEPROM hash = 0x%08lx\n",
|
|
data, dev->hash);
|
|
dev_info(&dev->intf->dev,
|
|
"EEPROM info:\n");
|
|
dev_info(&dev->intf->dev,
|
|
"\tmicrocode start address = 0x%04x, boot configuration = 0x%02x\n",
|
|
mc_start, data[2]);
|
|
/*
|
|
* boot configuration (address 0x0002):
|
|
* [0] microcode download speed: 1 = 400 kHz; 0 = 100 kHz
|
|
* [1] always selects 12 kb RAM
|
|
* [2] USB device speed: 1 = force Full Speed; 0 = auto detect
|
|
* [4] 1 = force fast mode and no suspend for device testing
|
|
* [5:7] USB PHY tuning registers; determined by device
|
|
* characterization
|
|
*/
|
|
|
|
/*
|
|
* Read hardware config dataset offset from address
|
|
* (microcode start + 46)
|
|
*/
|
|
err = em28xx_i2c_read_block(dev, bus, mc_start + 46, 1, 2,
|
|
data);
|
|
if (err != 2) {
|
|
dev_err(&dev->intf->dev,
|
|
"failed to read hardware configuration data from eeprom (err=%d)\n",
|
|
err);
|
|
goto error;
|
|
}
|
|
|
|
/* Calculate hardware config dataset start address */
|
|
hwconf_offset = mc_start + data[0] + (data[1] << 8);
|
|
|
|
/* Read hardware config dataset */
|
|
/*
|
|
* NOTE: the microcode copy can be multiple pages long, but
|
|
* we assume the hardware config dataset is the same as in
|
|
* the old eeprom and not longer than 256 bytes.
|
|
* tveeprom is currently also limited to 256 bytes.
|
|
*/
|
|
err = em28xx_i2c_read_block(dev, bus, hwconf_offset, 1, len,
|
|
data);
|
|
if (err != len) {
|
|
dev_err(&dev->intf->dev,
|
|
"failed to read hardware configuration data from eeprom (err=%d)\n",
|
|
err);
|
|
goto error;
|
|
}
|
|
|
|
/* Verify hardware config dataset */
|
|
/* NOTE: not all devices provide this type of dataset */
|
|
if (data[0] != 0x1a || data[1] != 0xeb ||
|
|
data[2] != 0x67 || data[3] != 0x95) {
|
|
dev_info(&dev->intf->dev,
|
|
"\tno hardware configuration dataset found in eeprom\n");
|
|
kfree(data);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* TODO: decrypt eeprom data for camera bridges
|
|
* (em25xx, em276x+)
|
|
*/
|
|
|
|
} else if (!dev->eeprom_addrwidth_16bit &&
|
|
data[0] == 0x1a && data[1] == 0xeb &&
|
|
data[2] == 0x67 && data[3] == 0x95) {
|
|
dev->hash = em28xx_hash_mem(data, len, 32);
|
|
dev_info(&dev->intf->dev,
|
|
"EEPROM ID = %4ph, EEPROM hash = 0x%08lx\n",
|
|
data, dev->hash);
|
|
dev_info(&dev->intf->dev,
|
|
"EEPROM info:\n");
|
|
} else {
|
|
dev_info(&dev->intf->dev,
|
|
"unknown eeprom format or eeprom corrupted !\n");
|
|
err = -ENODEV;
|
|
goto error;
|
|
}
|
|
|
|
*eedata = data;
|
|
*eedata_len = len;
|
|
dev_config = (void *)*eedata;
|
|
|
|
switch (le16_to_cpu(dev_config->chip_conf) >> 4 & 0x3) {
|
|
case 0:
|
|
dev_info(&dev->intf->dev, "\tNo audio on board.\n");
|
|
break;
|
|
case 1:
|
|
dev_info(&dev->intf->dev, "\tAC97 audio (5 sample rates)\n");
|
|
break;
|
|
case 2:
|
|
if (dev->chip_id < CHIP_ID_EM2860)
|
|
dev_info(&dev->intf->dev,
|
|
"\tI2S audio, sample rate=32k\n");
|
|
else
|
|
dev_info(&dev->intf->dev,
|
|
"\tI2S audio, 3 sample rates\n");
|
|
break;
|
|
case 3:
|
|
if (dev->chip_id < CHIP_ID_EM2860)
|
|
dev_info(&dev->intf->dev,
|
|
"\tI2S audio, 3 sample rates\n");
|
|
else
|
|
dev_info(&dev->intf->dev,
|
|
"\tI2S audio, 5 sample rates\n");
|
|
break;
|
|
}
|
|
|
|
if (le16_to_cpu(dev_config->chip_conf) & 1 << 3)
|
|
dev_info(&dev->intf->dev, "\tUSB Remote wakeup capable\n");
|
|
|
|
if (le16_to_cpu(dev_config->chip_conf) & 1 << 2)
|
|
dev_info(&dev->intf->dev, "\tUSB Self power capable\n");
|
|
|
|
switch (le16_to_cpu(dev_config->chip_conf) & 0x3) {
|
|
case 0:
|
|
dev_info(&dev->intf->dev, "\t500mA max power\n");
|
|
break;
|
|
case 1:
|
|
dev_info(&dev->intf->dev, "\t400mA max power\n");
|
|
break;
|
|
case 2:
|
|
dev_info(&dev->intf->dev, "\t300mA max power\n");
|
|
break;
|
|
case 3:
|
|
dev_info(&dev->intf->dev, "\t200mA max power\n");
|
|
break;
|
|
}
|
|
dev_info(&dev->intf->dev,
|
|
"\tTable at offset 0x%02x, strings=0x%04x, 0x%04x, 0x%04x\n",
|
|
dev_config->string_idx_table,
|
|
le16_to_cpu(dev_config->string1),
|
|
le16_to_cpu(dev_config->string2),
|
|
le16_to_cpu(dev_config->string3));
|
|
|
|
return 0;
|
|
|
|
error:
|
|
kfree(data);
|
|
return err;
|
|
}
|
|
|
|
/* ----------------------------------------------------------- */
|
|
|
|
/*
|
|
* functionality()
|
|
*/
|
|
static u32 functionality(struct i2c_adapter *i2c_adap)
|
|
{
|
|
struct em28xx_i2c_bus *i2c_bus = i2c_adap->algo_data;
|
|
|
|
if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM28XX ||
|
|
i2c_bus->algo_type == EM28XX_I2C_ALGO_EM25XX_BUS_B) {
|
|
return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
|
|
} else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM2800) {
|
|
return (I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL) &
|
|
~I2C_FUNC_SMBUS_WRITE_BLOCK_DATA;
|
|
}
|
|
|
|
WARN(1, "Unknown i2c bus algorithm.\n");
|
|
return 0;
|
|
}
|
|
|
|
static const struct i2c_algorithm em28xx_algo = {
|
|
.master_xfer = em28xx_i2c_xfer,
|
|
.functionality = functionality,
|
|
};
|
|
|
|
static const struct i2c_adapter em28xx_adap_template = {
|
|
.owner = THIS_MODULE,
|
|
.name = "em28xx",
|
|
.algo = &em28xx_algo,
|
|
};
|
|
|
|
static const struct i2c_client em28xx_client_template = {
|
|
.name = "em28xx internal",
|
|
};
|
|
|
|
/* ----------------------------------------------------------- */
|
|
|
|
/*
|
|
* i2c_devs
|
|
* incomplete list of known devices
|
|
*/
|
|
static char *i2c_devs[128] = {
|
|
[0x1c >> 1] = "lgdt330x",
|
|
[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, unsigned int bus)
|
|
{
|
|
u8 i2c_devicelist[128];
|
|
unsigned char buf;
|
|
int i, rc;
|
|
|
|
memset(i2c_devicelist, 0, sizeof(i2c_devicelist));
|
|
|
|
for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) {
|
|
dev->i2c_client[bus].addr = i;
|
|
rc = i2c_master_recv(&dev->i2c_client[bus], &buf, 0);
|
|
if (rc < 0)
|
|
continue;
|
|
i2c_devicelist[i] = i;
|
|
dev_info(&dev->intf->dev,
|
|
"found i2c device @ 0x%x on bus %d [%s]\n",
|
|
i << 1, bus, i2c_devs[i] ? i2c_devs[i] : "???");
|
|
}
|
|
|
|
if (bus == dev->def_i2c_bus)
|
|
dev->i2c_hash = em28xx_hash_mem(i2c_devicelist,
|
|
sizeof(i2c_devicelist), 32);
|
|
}
|
|
|
|
/*
|
|
* em28xx_i2c_register()
|
|
* register i2c bus
|
|
*/
|
|
int em28xx_i2c_register(struct em28xx *dev, unsigned int bus,
|
|
enum em28xx_i2c_algo_type algo_type)
|
|
{
|
|
int retval;
|
|
|
|
if (WARN_ON(!dev->em28xx_write_regs || !dev->em28xx_read_reg ||
|
|
!dev->em28xx_write_regs_req || !dev->em28xx_read_reg_req))
|
|
return -ENODEV;
|
|
|
|
if (bus >= NUM_I2C_BUSES)
|
|
return -ENODEV;
|
|
|
|
dev->i2c_adap[bus] = em28xx_adap_template;
|
|
dev->i2c_adap[bus].dev.parent = &dev->intf->dev;
|
|
strscpy(dev->i2c_adap[bus].name, dev_name(&dev->intf->dev),
|
|
sizeof(dev->i2c_adap[bus].name));
|
|
|
|
dev->i2c_bus[bus].bus = bus;
|
|
dev->i2c_bus[bus].algo_type = algo_type;
|
|
dev->i2c_bus[bus].dev = dev;
|
|
dev->i2c_adap[bus].algo_data = &dev->i2c_bus[bus];
|
|
|
|
retval = i2c_add_adapter(&dev->i2c_adap[bus]);
|
|
if (retval < 0) {
|
|
dev_err(&dev->intf->dev,
|
|
"%s: i2c_add_adapter failed! retval [%d]\n",
|
|
__func__, retval);
|
|
return retval;
|
|
}
|
|
|
|
dev->i2c_client[bus] = em28xx_client_template;
|
|
dev->i2c_client[bus].adapter = &dev->i2c_adap[bus];
|
|
|
|
/* Up to now, all eeproms are at bus 0 */
|
|
if (!bus) {
|
|
retval = em28xx_i2c_eeprom(dev, bus,
|
|
&dev->eedata, &dev->eedata_len);
|
|
if (retval < 0 && retval != -ENODEV) {
|
|
dev_err(&dev->intf->dev,
|
|
"%s: em28xx_i2_eeprom failed! retval [%d]\n",
|
|
__func__, retval);
|
|
}
|
|
}
|
|
|
|
if (i2c_scan)
|
|
em28xx_do_i2c_scan(dev, bus);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* em28xx_i2c_unregister()
|
|
* unregister i2c_bus
|
|
*/
|
|
int em28xx_i2c_unregister(struct em28xx *dev, unsigned int bus)
|
|
{
|
|
if (bus >= NUM_I2C_BUSES)
|
|
return -ENODEV;
|
|
|
|
i2c_del_adapter(&dev->i2c_adap[bus]);
|
|
return 0;
|
|
}
|