444 lines
10 KiB
C
444 lines
10 KiB
C
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/*
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em2820-i2c.c - driver for Empia EM2820/2840 USB video capture devices
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Copyright (C) 2005 Markus Rechberger <mrechberger@gmail.com>
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Ludovico Cavedon <cavedon@sssup.it>
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Mauro Carvalho Chehab <mchehab@brturbo.com.br>
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Based on the em2800 driver from 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 <linux/videodev.h>
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#include <media/tuner.h>
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#include <linux/video_decoder.h>
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/* To be moved to compat.h */
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#if !defined(I2C_HW_B_EM2820)
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#define I2C_HW_B_EM2820 I2C_HW_B_BT848
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#endif
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#include "em2820.h"
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/* ----------------------------------------------------------- */
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static unsigned int i2c_scan = 0;
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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 = 0;
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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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#define dprintk(fmt, args...) if (i2c_debug) do {\
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printk(KERN_DEBUG "%s: %s: " fmt "\n",\
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dev->name, __FUNCTION__ , ##args); } while (0)
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#define dprintk1(fmt, args...) if (i2c_debug) do{ \
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printk(KERN_DEBUG "%s: %s: " fmt, \
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dev->name, __FUNCTION__ , ##args); } while (0)
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#define dprintk2(fmt, args...) if (i2c_debug) do {\
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printk(fmt , ##args); } while (0)
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/*
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* i2c_send_bytes()
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* untested for more than 4 bytes
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*/
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static int i2c_send_bytes(void *data, unsigned char addr, char *buf, short len,
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int stop)
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{
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int wrcount = 0;
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struct em2820 *dev = (struct em2820 *)data;
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wrcount = dev->em2820_write_regs_req(dev, stop ? 2 : 3, addr, buf, len);
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return wrcount;
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}
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/*
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* i2c_recv_byte()
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* read a byte from the i2c device
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*/
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static int i2c_recv_bytes(struct em2820 *dev, unsigned char addr, char *buf,
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int len)
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{
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int ret;
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ret = dev->em2820_read_reg_req_len(dev, 2, addr, buf, len);
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if (ret < 0) {
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em2820_warn("reading i2c device failed (error=%i)\n", ret);
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return ret;
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}
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if (dev->em2820_read_reg(dev, 0x5) != 0)
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return -ENODEV;
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return ret;
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}
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/*
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* 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 i2c_check_for_device(struct em2820 *dev, unsigned char addr)
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{
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char msg;
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int ret;
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msg = addr;
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ret = dev->em2820_read_reg_req(dev, 2, addr);
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if (ret < 0) {
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em2820_warn("reading from i2c device failed (error=%i)\n", ret);
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return ret;
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}
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if (dev->em2820_read_reg(dev, 0x5) != 0)
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return -ENODEV;
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return 0;
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}
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/*
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* em2820_i2c_xfer()
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* the main i2c transfer function
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*/
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static int em2820_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 em2820 *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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dprintk1("%s %s addr=%x len=%d:",
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(msgs[i].flags & I2C_M_RD) ? "read" : "write",
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i == num - 1 ? "stop" : "nonstop", addr, msgs[i].len);
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if (!msgs[i].len) { /* no len: check only for device presence */
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rc = i2c_check_for_device(dev, addr);
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if (rc < 0) {
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dprintk2(" no device\n");
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return rc;
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}
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}
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if (msgs[i].flags & I2C_M_RD) {
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/* read bytes */
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rc = i2c_recv_bytes(dev, addr, 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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}
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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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rc = i2c_send_bytes(dev, addr, msgs[i].buf, msgs[i].len,
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i == num - 1);
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if (rc < 0)
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goto err;
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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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err:
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dprintk2(" ERROR: %i\n", rc);
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return rc;
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}
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static int em2820_i2c_eeprom(struct em2820 *dev, unsigned char *eedata, int len)
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{
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unsigned char buf, *p = eedata;
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struct em2820_eeprom *em_eeprom = (void *)eedata;
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int i, err, size = len, block;
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dev->i2c_client.addr = 0xa0 >> 1;
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buf = 0;
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if (1 != (err = i2c_master_send(&dev->i2c_client, &buf, 1))) {
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printk(KERN_INFO "%s: Huh, no eeprom present (err=%d)?\n",
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dev->name, err);
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return -1;
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}
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while (size > 0) {
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if (size > 16)
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block = 16;
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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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printk(KERN_WARNING
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"%s: i2c eeprom read error (err=%d)\n",
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dev->name, err);
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return -1;
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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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printk(KERN_INFO "%s: i2c eeprom %02x:", dev->name, 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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printk(KERN_INFO "EEPROM ID= 0x%08x\n", em_eeprom->id);
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printk(KERN_INFO "Vendor/Product ID= %04x:%04x\n", em_eeprom->vendor_ID,
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em_eeprom->product_ID);
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switch (em_eeprom->chip_conf >> 4 & 0x3) {
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case 0:
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printk(KERN_INFO "No audio on board.\n");
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break;
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case 1:
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printk(KERN_INFO "AC97 audio (5 sample rates)\n");
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break;
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case 2:
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printk(KERN_INFO "I2S audio, sample rate=32k\n");
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break;
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case 3:
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printk(KERN_INFO "I2S 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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printk(KERN_INFO "USB Remote wakeup capable\n");
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if (em_eeprom->chip_conf & 1 << 2)
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printk(KERN_INFO "USB Self power capable\n");
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switch (em_eeprom->chip_conf & 0x3) {
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case 0:
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printk(KERN_INFO "500mA max power\n");
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break;
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case 1:
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printk(KERN_INFO "400mA max power\n");
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break;
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case 2:
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printk(KERN_INFO "300mA max power\n");
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break;
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case 3:
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printk(KERN_INFO "200mA max power\n");
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break;
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}
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return 0;
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}
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/* ----------------------------------------------------------- */
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/*
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* algo_control()
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*/
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static int algo_control(struct i2c_adapter *adapter,
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unsigned int cmd, unsigned long arg)
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{
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return 0;
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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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return I2C_FUNC_SMBUS_EMUL;
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}
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#ifndef I2C_PEC
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static void inc_use(struct i2c_adapter *adap)
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{
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MOD_INC_USE_COUNT;
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}
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static void dec_use(struct i2c_adapter *adap)
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{
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MOD_DEC_USE_COUNT;
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}
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#endif
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static int em2820_set_tuner(int check_eeprom, struct i2c_client *client)
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{
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struct em2820 *dev = client->adapter->algo_data;
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struct tuner_setup tun_setup;
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/* tuner */
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if (dev->has_tuner) {
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tun_setup.mode_mask = T_ANALOG_TV | T_RADIO;
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tun_setup.type = dev->tuner_type;
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tun_setup.addr = dev->tuner_addr;
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em2820_i2c_call_clients(dev, TUNER_SET_TYPE_ADDR, &tun_setup);
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}
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return (0);
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}
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/*
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* attach_inform()
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* gets called when a device attaches to the i2c bus
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* does some basic configuration
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*/
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static int attach_inform(struct i2c_client *client)
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{
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struct em2820 *dev = client->adapter->algo_data;
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dprintk("address %x", client->addr << 1);
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switch (client->addr << 1) {
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case 0x68:
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em2820_i2c_call_clients(dev, TDA9887_SET_CONFIG, &dev->tda9887_conf);
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break;
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case 0x4a:
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dprintk1("attach_inform: saa7113 detected.\n");
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break;
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case 0xa0:
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dprintk1("attach_inform: eeprom detected.\n");
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break;
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case 0x80:
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case 0x88:
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dprintk1("attach_inform: msp34xx detected.\n");
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break;
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case 0xb8:
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case 0xba:
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dprintk1("attach_inform: tvp5150 detected.\n");
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break;
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default:
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dev->tuner_addr = client->addr;
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em2820_set_tuner(-1, client);
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}
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return 0;
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}
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static struct i2c_algorithm em2820_algo = {
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.name = "em2820",
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.id = I2C_HW_B_EM2820,
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.master_xfer = em2820_i2c_xfer,
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.algo_control = algo_control,
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.functionality = functionality,
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};
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static struct i2c_adapter em2820_adap_template = {
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#ifdef I2C_PEC
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.owner = THIS_MODULE,
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#else
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.inc_use = inc_use,
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.dec_use = dec_use,
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#endif
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#ifdef I2C_CLASS_TV_ANALOG
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.class = I2C_CLASS_TV_ANALOG,
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#endif
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.name = "em2820",
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.id = I2C_HW_B_EM2820,
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.algo = &em2820_algo,
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.client_register = attach_inform,
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};
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static struct i2c_client em2820_client_template = {
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.name = "em2820 internal",
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.flags = I2C_CLIENT_ALLOW_USE,
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};
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/* ----------------------------------------------------------- */
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/*
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* i2c_devs
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* incomplete list of known devices
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*/
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static char *i2c_devs[128] = {
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[0x4a >> 1] = "saa7113h",
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[0x60 >> 1] = "remote IR sensor",
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[0x86 >> 1] = "tda9887",
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[0x80 >> 1] = "msp34xx",
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[0x88 >> 1] = "msp34xx",
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[0xa0 >> 1] = "eeprom",
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|
|
[0xb8 >> 1] = "tvp5150a",
|
||
|
|
[0xba >> 1] = "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
|
||
|
|
*/
|
||
|
|
static void do_i2c_scan(char *name, struct i2c_client *c)
|
||
|
|
{
|
||
|
|
unsigned char buf;
|
||
|
|
int i, rc;
|
||
|
|
|
||
|
|
for (i = 0; i < 128; i++) {
|
||
|
|
c->addr = i;
|
||
|
|
rc = i2c_master_recv(c, &buf, 0);
|
||
|
|
if (rc < 0)
|
||
|
|
continue;
|
||
|
|
printk(KERN_INFO "%s: found device @ 0x%x [%s]", name,
|
||
|
|
i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* em2820_i2c_call_clients()
|
||
|
|
* send commands to all attached i2c devices
|
||
|
|
*/
|
||
|
|
void em2820_i2c_call_clients(struct em2820 *dev, unsigned int cmd, void *arg)
|
||
|
|
{
|
||
|
|
BUG_ON(NULL == dev->i2c_adap.algo_data);
|
||
|
|
i2c_clients_command(&dev->i2c_adap, cmd, arg);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* em2820_i2c_register()
|
||
|
|
* register i2c bus
|
||
|
|
*/
|
||
|
|
int em2820_i2c_register(struct em2820 *dev)
|
||
|
|
{
|
||
|
|
BUG_ON(!dev->em2820_write_regs || !dev->em2820_read_reg);
|
||
|
|
BUG_ON(!dev->em2820_write_regs_req || !dev->em2820_read_reg_req);
|
||
|
|
dev->i2c_adap = em2820_adap_template;
|
||
|
|
dev->i2c_adap.dev.parent = &dev->udev->dev;
|
||
|
|
strcpy(dev->i2c_adap.name, dev->name);
|
||
|
|
dev->i2c_adap.algo_data = dev;
|
||
|
|
i2c_add_adapter(&dev->i2c_adap);
|
||
|
|
|
||
|
|
dev->i2c_client = em2820_client_template;
|
||
|
|
dev->i2c_client.adapter = &dev->i2c_adap;
|
||
|
|
|
||
|
|
em2820_i2c_eeprom(dev, dev->eedata, sizeof(dev->eedata));
|
||
|
|
|
||
|
|
if (i2c_scan)
|
||
|
|
do_i2c_scan(dev->name, &dev->i2c_client);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* em2820_i2c_unregister()
|
||
|
|
* unregister i2c_bus
|
||
|
|
*/
|
||
|
|
int em2820_i2c_unregister(struct em2820 *dev)
|
||
|
|
{
|
||
|
|
i2c_del_adapter(&dev->i2c_adap);
|
||
|
|
return 0;
|
||
|
|
}
|