// SPDX-License-Identifier: GPL-2.0
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// tm6000-i2c.c - driver for TM5600/TM6000/TM6010 USB video capture devices
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//
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// Copyright (c) 2006-2007 Mauro Carvalho Chehab <mchehab@kernel.org>
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//
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// Copyright (c) 2007 Michel Ludwig <michel.ludwig@gmail.com>
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// - Fix SMBus Read Byte command
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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 "tm6000.h"
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#include "tm6000-regs.h"
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#include <media/v4l2-common.h>
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#include <media/tuner.h>
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#include "tuner-xc2028.h"
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/* ----------------------------------------------------------- */
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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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#define i2c_dprintk(lvl, fmt, args...) if (i2c_debug >= lvl) do { \
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printk(KERN_DEBUG "%s at %s: " fmt, \
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dev->name, __func__, ##args); } while (0)
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static int tm6000_i2c_send_regs(struct tm6000_core *dev, unsigned char addr,
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__u8 reg, char *buf, int len)
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{
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int rc;
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unsigned int i2c_packet_limit = 16;
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if (dev->dev_type == TM6010)
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i2c_packet_limit = 80;
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if (!buf)
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return -1;
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if (len < 1 || len > i2c_packet_limit) {
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printk(KERN_ERR "Incorrect length of i2c packet = %d, limit set to %d\n",
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len, i2c_packet_limit);
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return -1;
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}
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/* capture mutex */
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rc = tm6000_read_write_usb(dev, USB_DIR_OUT | USB_TYPE_VENDOR |
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USB_RECIP_DEVICE, REQ_16_SET_GET_I2C_WR1_RDN,
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addr | reg << 8, 0, buf, len);
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if (rc < 0) {
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/* release mutex */
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return rc;
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}
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/* release mutex */
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return rc;
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}
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/* Generic read - doesn't work fine with 16bit registers */
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static int tm6000_i2c_recv_regs(struct tm6000_core *dev, unsigned char addr,
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__u8 reg, char *buf, int len)
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{
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int rc;
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u8 b[2];
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unsigned int i2c_packet_limit = 16;
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if (dev->dev_type == TM6010)
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i2c_packet_limit = 64;
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if (!buf)
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return -1;
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if (len < 1 || len > i2c_packet_limit) {
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printk(KERN_ERR "Incorrect length of i2c packet = %d, limit set to %d\n",
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len, i2c_packet_limit);
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return -1;
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}
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/* capture mutex */
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if ((dev->caps.has_zl10353) && (dev->demod_addr << 1 == addr) && (reg % 2 == 0)) {
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/*
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* Workaround an I2C bug when reading from zl10353
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*/
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reg -= 1;
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len += 1;
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rc = tm6000_read_write_usb(dev, USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
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REQ_16_SET_GET_I2C_WR1_RDN, addr | reg << 8, 0, b, len);
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*buf = b[1];
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} else {
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rc = tm6000_read_write_usb(dev, USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
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REQ_16_SET_GET_I2C_WR1_RDN, addr | reg << 8, 0, buf, len);
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}
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/* release mutex */
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return rc;
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}
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/*
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* read from a 16bit register
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* for example xc2028, xc3028 or xc3028L
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*/
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static int tm6000_i2c_recv_regs16(struct tm6000_core *dev, unsigned char addr,
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__u16 reg, char *buf, int len)
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{
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int rc;
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unsigned char ureg;
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if (!buf || len != 2)
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return -1;
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/* capture mutex */
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if (dev->dev_type == TM6010) {
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ureg = reg & 0xFF;
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rc = tm6000_read_write_usb(dev, USB_DIR_OUT | USB_TYPE_VENDOR |
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USB_RECIP_DEVICE, REQ_16_SET_GET_I2C_WR1_RDN,
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addr | (reg & 0xFF00), 0, &ureg, 1);
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if (rc < 0) {
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/* release mutex */
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return rc;
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}
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rc = tm6000_read_write_usb(dev, USB_DIR_IN | USB_TYPE_VENDOR |
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USB_RECIP_DEVICE, REQ_35_AFTEK_TUNER_READ,
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reg, 0, buf, len);
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} else {
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rc = tm6000_read_write_usb(dev, USB_DIR_IN | USB_TYPE_VENDOR |
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USB_RECIP_DEVICE, REQ_14_SET_GET_I2C_WR2_RDN,
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addr, reg, buf, len);
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}
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/* release mutex */
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return rc;
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}
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static int tm6000_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 tm6000_core *dev = i2c_adap->algo_data;
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int addr, rc, i, byte;
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for (i = 0; i < num; i++) {
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addr = (msgs[i].addr << 1) & 0xff;
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i2c_dprintk(2, "%s %s addr=0x%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].flags & I2C_M_RD) {
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/* read request without preceding register selection */
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/*
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* The TM6000 only supports a read transaction
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* immediately after a 1 or 2 byte write to select
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* a register. We cannot fulfill this request.
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*/
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i2c_dprintk(2, " read without preceding write not supported");
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rc = -EOPNOTSUPP;
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goto err;
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} else if (i + 1 < num && msgs[i].len <= 2 &&
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(msgs[i + 1].flags & I2C_M_RD) &&
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msgs[i].addr == msgs[i + 1].addr) {
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/* 1 or 2 byte write followed by a read */
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if (i2c_debug >= 2)
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for (byte = 0; byte < msgs[i].len; byte++)
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printk(KERN_CONT " %02x", msgs[i].buf[byte]);
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i2c_dprintk(2, "; joined to read %s len=%d:",
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i == num - 2 ? "stop" : "nonstop",
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msgs[i + 1].len);
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if (msgs[i].len == 2) {
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rc = tm6000_i2c_recv_regs16(dev, addr,
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msgs[i].buf[0] << 8 | msgs[i].buf[1],
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msgs[i + 1].buf, msgs[i + 1].len);
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} else {
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rc = tm6000_i2c_recv_regs(dev, addr, msgs[i].buf[0],
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msgs[i + 1].buf, msgs[i + 1].len);
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}
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i++;
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if (addr == dev->tuner_addr << 1) {
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tm6000_set_reg(dev, REQ_50_SET_START, 0, 0);
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tm6000_set_reg(dev, REQ_51_SET_STOP, 0, 0);
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}
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if (i2c_debug >= 2)
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for (byte = 0; byte < msgs[i].len; byte++)
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printk(KERN_CONT " %02x", msgs[i].buf[byte]);
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} else {
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/* write bytes */
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if (i2c_debug >= 2)
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for (byte = 0; byte < msgs[i].len; byte++)
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printk(KERN_CONT " %02x", msgs[i].buf[byte]);
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rc = tm6000_i2c_send_regs(dev, addr, msgs[i].buf[0],
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msgs[i].buf + 1, msgs[i].len - 1);
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}
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if (i2c_debug >= 2)
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printk(KERN_CONT "\n");
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if (rc < 0)
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goto err;
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}
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return num;
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err:
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i2c_dprintk(2, " ERROR: %i\n", rc);
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return rc;
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}
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static int tm6000_i2c_eeprom(struct tm6000_core *dev)
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{
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int i, rc;
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unsigned char *p = dev->eedata;
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unsigned char bytes[17];
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dev->i2c_client.addr = 0xa0 >> 1;
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dev->eedata_size = 0;
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bytes[16] = '\0';
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for (i = 0; i < sizeof(dev->eedata); ) {
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*p = i;
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rc = tm6000_i2c_recv_regs(dev, 0xa0, i, p, 1);
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if (rc < 1) {
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if (p == dev->eedata)
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goto noeeprom;
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else {
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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, rc);
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}
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return -EINVAL;
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}
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dev->eedata_size++;
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p++;
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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(KERN_CONT " %02x", dev->eedata[i]);
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if ((dev->eedata[i] >= ' ') && (dev->eedata[i] <= 'z'))
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bytes[i%16] = dev->eedata[i];
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else
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bytes[i%16] = '.';
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i++;
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if (0 == (i % 16)) {
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bytes[16] = '\0';
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printk(KERN_CONT " %s\n", bytes);
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}
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}
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if (0 != (i%16)) {
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bytes[i%16] = '\0';
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for (i %= 16; i < 16; i++)
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printk(KERN_CONT " ");
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printk(KERN_CONT " %s\n", bytes);
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}
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return 0;
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noeeprom:
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printk(KERN_INFO "%s: Huh, no eeprom present (err=%d)?\n",
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dev->name, rc);
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return -EINVAL;
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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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return I2C_FUNC_SMBUS_EMUL;
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}
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static const struct i2c_algorithm tm6000_algo = {
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.master_xfer = tm6000_i2c_xfer,
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.functionality = functionality,
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};
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/* ----------------------------------------------------------- */
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/*
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* tm6000_i2c_register()
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* register i2c bus
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*/
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int tm6000_i2c_register(struct tm6000_core *dev)
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{
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int rc;
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dev->i2c_adap.owner = THIS_MODULE;
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dev->i2c_adap.algo = &tm6000_algo;
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dev->i2c_adap.dev.parent = &dev->udev->dev;
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strscpy(dev->i2c_adap.name, dev->name, sizeof(dev->i2c_adap.name));
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dev->i2c_adap.algo_data = dev;
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i2c_set_adapdata(&dev->i2c_adap, &dev->v4l2_dev);
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rc = i2c_add_adapter(&dev->i2c_adap);
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if (rc)
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return rc;
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dev->i2c_client.adapter = &dev->i2c_adap;
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strscpy(dev->i2c_client.name, "tm6000 internal", I2C_NAME_SIZE);
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tm6000_i2c_eeprom(dev);
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return 0;
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}
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/*
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* tm6000_i2c_unregister()
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* unregister i2c_bus
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*/
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int tm6000_i2c_unregister(struct tm6000_core *dev)
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{
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i2c_del_adapter(&dev->i2c_adap);
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return 0;
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}
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