Hey, as I recently obtained such a PCMCIA card, I try to revive the wnv_cs driver for Winnov Videum Traveler video cards. First (non-working, but compiling and able to access the EEPROM and to detect the decoder) results may be found at
http://git.kernel.org/?p=linux/kernel/git/brodo/pcmcia-2.6.git;a=shortlog;h=refs/heads/wnv Now, I got a bit stuck at the i2c level -- do the following access functions look familiar to one of the i2c experts? If so, which algo driver is to be used? Is this an i2c_smbus_, or some very custom interface not worth converting to use the i2c subsystem? Many thanks! Best, Dominik PS: The i2c addresses used in this driver are > 0x7f (e.g. 0xa0, 0x8e, 0x48, 0x4a, 0x34, 0xa8, 0x68) /* * 2 * I C B U S I N T E R F A C E * */ static __u16 in_ctl(struct videum_device *dev) { return wavi_readreg(dev, WAVI_CTL); } static void out_ctl(struct videum_device *dev) { wavi_writereg(dev, WAVI_CTL, dev->ctl); } static void i2c_delay(void) { udelay(2); } static void i2c_clock(struct videum_device *dev, int c) { int t = 1000; if (c) dev->ctl |= WAVI_I2CBIT; else dev->ctl &= ~WAVI_I2CBIT; out_ctl(dev); if (!c) while (--t && (in_ctl(dev) & WAVI_I2CBIT)); } static void i2c_data(struct videum_device *dev, int d) { if (d) dev->ctl |= WAVI_IMDBIT; else dev->ctl &= ~WAVI_IMDBIT; out_ctl(dev); } /* BUG: I2C bit read routines, polarity */ static void i2c_start(struct videum_device *dev) { dev->ctl &= ~(WAVI_I2CBIT | WAVI_IMDBIT); out_ctl(dev); i2c_delay(); i2c_data(dev, 1); i2c_delay(); i2c_clock(dev, 0); i2c_delay(); } static int i2c_get_ack(struct videum_device *dev) { i2c_clock(dev, 1); i2c_delay(); i2c_data(dev, 0); i2c_delay(); i2c_clock(dev, 0); i2c_delay(); i2c_delay(); return in_ctl(dev) & WAVI_IMDBIT; } static void i2c_send_ack(struct videum_device *dev) { i2c_clock(dev, 1); i2c_delay(); i2c_data(dev, 1); i2c_delay(); i2c_clock(dev, 0); i2c_delay(); } static void i2c_send_nak(struct videum_device *dev) { i2c_clock(dev, 1); i2c_delay(); i2c_data(dev, 0); i2c_delay(); i2c_clock(dev, 0); i2c_delay(); } static void i2c_end(struct videum_device *dev) { i2c_clock(dev, 1); i2c_delay(); i2c_data(dev, 1); i2c_delay(); i2c_clock(dev, 0); i2c_delay(); i2c_data(dev, 0); i2c_delay(); } static void i2c_vpxrestart(struct videum_device *dev) { i2c_clock(dev, 1); i2c_delay(); i2c_data(dev, 0); i2c_delay(); i2c_clock(dev, 0); i2c_delay(); } static void i2c_out8(struct videum_device *dev, int ndata) { int i; ndata = ~ndata; for (i = 0; i < 8; ++i) { i2c_clock(dev, 1); i2c_delay(); i2c_data(dev, ndata & 128); i2c_delay(); i2c_clock(dev, 0); i2c_delay(); ndata <<= 1; } } static int i2c_in8(struct videum_device *dev) { int i; int ndata = ~0; dev->ctl &= ~WAVI_IMDBIT;// Don't write to h/w now for (i = 0; i < 8; ++i) { i2c_clock(dev, 1); i2c_delay(); i2c_clock(dev, 0); i2c_delay(); ndata = (in_ctl(dev) & 1) | (ndata << 1); } return ~ndata; } static void i2c_get_ready(struct videum_device *dev) {/* Prepare I2C bus for operation */ dev->ctl = in_ctl(dev); /* initialize the CTL register shadow */ i2c_end(dev); /* idle the I2C bus */ } static int i2c_error(struct videum_device *dev) { i2c_end(dev); return -1; } // Returns -1 on error. static int i2c_read_reg_byte(struct videum_device *dev, int addr, int reg) { int ndata; i2c_start(dev); i2c_out8(dev, addr); if (!i2c_get_ack(dev)) return i2c_error(dev);/* no ACK from device */ i2c_out8(dev, reg); i2c_get_ack(dev); /* assume it succeeds if the first one succeeded */ if (addr == 0x86 || addr == 0x8E)/* ITT VPX is a little different */ i2c_vpxrestart(dev); else i2c_end(dev); i2c_start(dev); i2c_out8(dev, addr | 1); if (!i2c_get_ack(dev)) return i2c_error(dev); ndata = i2c_in8(dev); if (addr == 0x86 || addr == 0x8E)/* ITT VPX is a little different */ i2c_send_nak(dev); i2c_end(dev); return ndata; } static int /* -1 on error */ i2c_write_reg_byte(struct videum_device *dev, int addr, int reg, int ndata) { i2c_start(dev); i2c_out8(dev, addr); if (!i2c_get_ack(dev)) return i2c_error(dev);/* no ACK from device */ i2c_out8(dev, reg); i2c_get_ack(dev); i2c_out8(dev, ndata); i2c_get_ack(dev); i2c_end(dev); return 0; } static int /* -1 on error */ i2c_read_reg_word(struct videum_device *dev, int addr, int reg) { int ndata; i2c_start(dev); i2c_out8(dev, addr); if (!i2c_get_ack(dev)) return i2c_error(dev);/* no ACK from device */ i2c_out8(dev, reg); i2c_get_ack(dev); /* assume it succeeds if the first one succeeded */ if (addr == 0x86 || addr == 0x8E)/* ITT VPX is a little different */ i2c_vpxrestart(dev); else i2c_end(dev); i2c_start(dev); i2c_out8(dev, addr | 1); if (!i2c_get_ack(dev)) return i2c_error(dev); ndata = i2c_in8(dev) << 8; i2c_send_ack(dev); ndata |= i2c_in8(dev); i2c_send_nak(dev); i2c_end(dev); return ndata; } static int /* -1 on error */ i2c_write_reg_word(struct videum_device *dev, int addr, int reg, int ndata) { i2c_start(dev); i2c_out8(dev, addr); if (!i2c_get_ack(dev)) return i2c_error(dev);/* no ACK from device */ i2c_out8(dev, reg); i2c_get_ack(dev); i2c_out8(dev, ndata >> 8); i2c_get_ack(dev); i2c_out8(dev, ndata & 0xFF); i2c_get_ack(dev); i2c_end(dev); return 0; } -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
