/* * tm6000-i2c.c - driver for TM5600/TM6000/TM6010 USB video capture devices * * Copyright (C) 2006-2007 Mauro Carvalho Chehab * * Copyright (C) 2007 Michel Ludwig * - Fix SMBus Read Byte command * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation version 2 * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include #include #include #include #include "tm6000.h" #include "tm6000-regs.h" #include #include #include "tuner-xc2028.h" /* ----------------------------------------------------------- */ static unsigned int i2c_debug; module_param(i2c_debug, int, 0644); MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]"); #define i2c_dprintk(lvl, fmt, args...) if (i2c_debug >= lvl) do { \ printk(KERN_DEBUG "%s at %s: " fmt, \ dev->name, __func__, ##args); } while (0) static int tm6000_i2c_send_regs(struct tm6000_core *dev, unsigned char addr, __u8 reg, char *buf, int len) { int rc; unsigned int tsleep; unsigned int i2c_packet_limit = 16; if (dev->dev_type == TM6010) i2c_packet_limit = 64; if (!buf) return -1; if (len < 1 || len > i2c_packet_limit) { printk(KERN_ERR "Incorrect length of i2c packet = %d, limit set to %d\n", len, i2c_packet_limit); return -1; } /* capture mutex */ rc = tm6000_read_write_usb(dev, USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE, REQ_16_SET_GET_I2C_WR1_RDN, addr | reg << 8, 0, buf, len); if (rc < 0) { /* release mutex */ return rc; } /* Calculate delay time, 14000us for 64 bytes */ tsleep = ((len * 200) + 200 + 1000) / 1000; msleep(tsleep); /* release mutex */ return rc; } /* Generic read - doesn't work fine with 16bit registers */ static int tm6000_i2c_recv_regs(struct tm6000_core *dev, unsigned char addr, __u8 reg, char *buf, int len) { int rc; u8 b[2]; unsigned int i2c_packet_limit = 16; if (dev->dev_type == TM6010) i2c_packet_limit = 64; if (!buf) return -1; if (len < 1 || len > i2c_packet_limit) { printk(KERN_ERR "Incorrect length of i2c packet = %d, limit set to %d\n", len, i2c_packet_limit); return -1; } /* capture mutex */ if ((dev->caps.has_zl10353) && (dev->demod_addr << 1 == addr) && (reg % 2 == 0)) { /* * Workaround an I2C bug when reading from zl10353 */ reg -= 1; len += 1; rc = tm6000_read_write_usb(dev, USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE, REQ_16_SET_GET_I2C_WR1_RDN, addr | reg << 8, 0, b, len); *buf = b[1]; } else { rc = tm6000_read_write_usb(dev, USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE, REQ_16_SET_GET_I2C_WR1_RDN, addr | reg << 8, 0, buf, len); } /* release mutex */ return rc; } /* * read from a 16bit register * for example xc2028, xc3028 or xc3028L */ static int tm6000_i2c_recv_regs16(struct tm6000_core *dev, unsigned char addr, __u16 reg, char *buf, int len) { int rc; unsigned char ureg; if (!buf || len != 2) return -1; /* capture mutex */ if (dev->dev_type == TM6010) { ureg = reg & 0xFF; rc = tm6000_read_write_usb(dev, USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE, REQ_16_SET_GET_I2C_WR1_RDN, addr | (reg & 0xFF00), 0, &ureg, 1); if (rc < 0) { /* release mutex */ return rc; } msleep(1400 / 1000); rc = tm6000_read_write_usb(dev, USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE, REQ_35_AFTEK_TUNER_READ, reg, 0, buf, len); } else { rc = tm6000_read_write_usb(dev, USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE, REQ_14_SET_GET_I2C_WR2_RDN, addr, reg, buf, len); } /* release mutex */ return rc; } static int tm6000_i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg msgs[], int num) { struct tm6000_core *dev = i2c_adap->algo_data; int addr, rc, i, byte; if (num <= 0) return 0; for (i = 0; i < num; i++) { addr = (msgs[i].addr << 1) & 0xff; i2c_dprintk(2, "%s %s addr=0x%x len=%d:", (msgs[i].flags & I2C_M_RD) ? "read" : "write", i == num - 1 ? "stop" : "nonstop", addr, msgs[i].len); if (msgs[i].flags & I2C_M_RD) { /* read request without preceding register selection */ /* * The TM6000 only supports a read transaction * immediately after a 1 or 2 byte write to select * a register. We cannot fulfil this request. */ i2c_dprintk(2, " read without preceding write not" " supported"); rc = -EOPNOTSUPP; goto err; } else if (i + 1 < num && msgs[i].len <= 2 && (msgs[i + 1].flags & I2C_M_RD) && msgs[i].addr == msgs[i + 1].addr) { /* 1 or 2 byte write followed by a read */ if (i2c_debug >= 2) for (byte = 0; byte < msgs[i].len; byte++) printk(KERN_CONT " %02x", msgs[i].buf[byte]); i2c_dprintk(2, "; joined to read %s len=%d:", i == num - 2 ? "stop" : "nonstop", msgs[i + 1].len); if (msgs[i].len == 2) { rc = tm6000_i2c_recv_regs16(dev, addr, msgs[i].buf[0] << 8 | msgs[i].buf[1], msgs[i + 1].buf, msgs[i + 1].len); } else { rc = tm6000_i2c_recv_regs(dev, addr, msgs[i].buf[0], msgs[i + 1].buf, msgs[i + 1].len); } i++; if (addr == dev->tuner_addr << 1) { tm6000_set_reg(dev, REQ_50_SET_START, 0, 0); tm6000_set_reg(dev, REQ_51_SET_STOP, 0, 0); } if (i2c_debug >= 2) for (byte = 0; byte < msgs[i].len; byte++) printk(KERN_CONT " %02x", msgs[i].buf[byte]); } else { /* write bytes */ if (i2c_debug >= 2) for (byte = 0; byte < msgs[i].len; byte++) printk(KERN_CONT " %02x", msgs[i].buf[byte]); rc = tm6000_i2c_send_regs(dev, addr, msgs[i].buf[0], msgs[i].buf + 1, msgs[i].len - 1); } if (i2c_debug >= 2) printk(KERN_CONT "\n"); if (rc < 0) goto err; } return num; err: i2c_dprintk(2, " ERROR: %i\n", rc); return rc; } static int tm6000_i2c_eeprom(struct tm6000_core *dev) { int i, rc; unsigned char *p = dev->eedata; unsigned char bytes[17]; dev->i2c_client.addr = 0xa0 >> 1; dev->eedata_size = 0; bytes[16] = '\0'; for (i = 0; i < sizeof(dev->eedata); ) { *p = i; rc = tm6000_i2c_recv_regs(dev, 0xa0, i, p, 1); if (rc < 1) { if (p == dev->eedata) goto noeeprom; else { printk(KERN_WARNING "%s: i2c eeprom read error (err=%d)\n", dev->name, rc); } return -EINVAL; } dev->eedata_size++; p++; if (0 == (i % 16)) printk(KERN_INFO "%s: i2c eeprom %02x:", dev->name, i); printk(KERN_CONT " %02x", dev->eedata[i]); if ((dev->eedata[i] >= ' ') && (dev->eedata[i] <= 'z')) bytes[i%16] = dev->eedata[i]; else bytes[i%16] = '.'; i++; if (0 == (i % 16)) { bytes[16] = '\0'; printk(KERN_CONT " %s\n", bytes); } } if (0 != (i%16)) { bytes[i%16] = '\0'; for (i %= 16; i < 16; i++) printk(KERN_CONT " "); printk(KERN_CONT " %s\n", bytes); } return 0; noeeprom: printk(KERN_INFO "%s: Huh, no eeprom present (err=%d)?\n", dev->name, rc); return -EINVAL; } /* ----------------------------------------------------------- */ /* * functionality() */ static u32 functionality(struct i2c_adapter *adap) { return I2C_FUNC_SMBUS_EMUL; } static const struct i2c_algorithm tm6000_algo = { .master_xfer = tm6000_i2c_xfer, .functionality = functionality, }; /* ----------------------------------------------------------- */ /* * tm6000_i2c_register() * register i2c bus */ int tm6000_i2c_register(struct tm6000_core *dev) { int rc; dev->i2c_adap.owner = THIS_MODULE; dev->i2c_adap.algo = &tm6000_algo; dev->i2c_adap.dev.parent = &dev->udev->dev; strlcpy(dev->i2c_adap.name, dev->name, sizeof(dev->i2c_adap.name)); dev->i2c_adap.algo_data = dev; i2c_set_adapdata(&dev->i2c_adap, &dev->v4l2_dev); rc = i2c_add_adapter(&dev->i2c_adap); if (rc) return rc; dev->i2c_client.adapter = &dev->i2c_adap; strlcpy(dev->i2c_client.name, "tm6000 internal", I2C_NAME_SIZE); tm6000_i2c_eeprom(dev); return 0; } /* * tm6000_i2c_unregister() * unregister i2c_bus */ int tm6000_i2c_unregister(struct tm6000_core *dev) { i2c_del_adapter(&dev->i2c_adap); return 0; }