diff options
Diffstat (limited to 'drivers/media/usb/tm6000/tm6000-i2c.c')
| -rw-r--r-- | drivers/media/usb/tm6000/tm6000-i2c.c | 334 |
1 files changed, 334 insertions, 0 deletions
diff --git a/drivers/media/usb/tm6000/tm6000-i2c.c b/drivers/media/usb/tm6000/tm6000-i2c.c new file mode 100644 index 000000000000..c7e23e3dd75e --- /dev/null +++ b/drivers/media/usb/tm6000/tm6000-i2c.c @@ -0,0 +1,334 @@ +/* + * tm6000-i2c.c - driver for TM5600/TM6000/TM6010 USB video capture devices + * + * Copyright (C) 2006-2007 Mauro Carvalho Chehab <mchehab@infradead.org> + * + * Copyright (C) 2007 Michel Ludwig <michel.ludwig@gmail.com> + * - 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 <linux/module.h> +#include <linux/kernel.h> +#include <linux/usb.h> +#include <linux/i2c.h> + +#include "tm6000.h" +#include "tm6000-regs.h" +#include <media/v4l2-common.h> +#include <media/tuner.h> +#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 i2c_packet_limit = 16; + + if (dev->dev_type == TM6010) + i2c_packet_limit = 80; + + 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; + } + + /* 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; + } + + 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; +} |