static int pca_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, int num) { struct i2c_algo_pca_data *adap = i2c_adap->algo_data; struct i2c_msg *msg = NULL; int curmsg; int numbytes = 0; int state; int ret; int completed = 1; unsigned long timeout = jiffies + i2c_adap->timeout; while ((state = pca_status(adap)) != 0xf8) { if (time_before(jiffies, timeout)) { msleep(10); } else { dev_dbg(&i2c_adap->dev, "bus is not idle. status is " "%#04x\n", state); return -EAGAIN; } } DEB1("{{{ XFER %d messages\n", num); if (i2c_debug >= 2) { for (curmsg = 0; curmsg < num; curmsg++) { int addr, i; msg = &msgs[curmsg]; addr = (0x7f & msg->addr) ; if (msg->flags & I2C_M_RD) printk(KERN_INFO " [%02d] RD %d bytes from %#02x [%#02x, ...]\n", curmsg, msg->len, addr, (addr << 1) | 1); else { printk(KERN_INFO " [%02d] WR %d bytes to %#02x [%#02x%s", curmsg, msg->len, addr, addr << 1, msg->len == 0 ? "" : ", "); for (i = 0; i < msg->len; i++) printk("%#04x%s", msg->buf[i], i == msg->len - 1 ? "" : ", "); printk("]\n"); } } } curmsg = 0; ret = -EREMOTEIO; while (curmsg < num) { state = pca_status(adap); DEB3("STATE is 0x%02x\n", state); msg = &msgs[curmsg]; switch (state) { case 0xf8: /* On reset or stop the bus is idle */ completed = pca_start(adap); break; case 0x08: /* A START condition has been transmitted */ case 0x10: /* A repeated start condition has been transmitted */ completed = pca_address(adap, msg); break; case 0x18: /* SLA+W has been transmitted; ACK has been received */ case 0x28: /* Data byte in I2CDAT has been transmitted; ACK has been received */ if (numbytes < msg->len) { completed = pca_tx_byte(adap, msg->buf[numbytes]); numbytes++; break; } curmsg++; numbytes = 0; if (curmsg == num) pca_stop(adap); else completed = pca_repeated_start(adap); break; case 0x20: /* SLA+W has been transmitted; NOT ACK has been received */ DEB2("NOT ACK received after SLA+W\n"); pca_stop(adap); goto out; case 0x40: /* SLA+R has been transmitted; ACK has been received */ completed = pca_rx_ack(adap, msg->len > 1); break; case 0x50: /* Data bytes has been received; ACK has been returned */ if (numbytes < msg->len) { pca_rx_byte(adap, &msg->buf[numbytes], 1); numbytes++; completed = pca_rx_ack(adap, numbytes < msg->len - 1); break; } curmsg++; numbytes = 0; if (curmsg == num) pca_stop(adap); else completed = pca_repeated_start(adap); break; case 0x48: /* SLA+R has been transmitted; NOT ACK has been received */ DEB2("NOT ACK received after SLA+R\n"); pca_stop(adap); goto out; case 0x30: /* Data byte in I2CDAT has been transmitted; NOT ACK has been received */ DEB2("NOT ACK received after data byte\n"); pca_stop(adap); goto out; case 0x38: /* Arbitration lost during SLA+W, SLA+R or data bytes */ DEB2("Arbitration lost\n"); /* * The PCA9564 data sheet (2006-09-01) says "A * START condition will be transmitted when the * bus becomes free (STOP or SCL and SDA high)" * when the STA bit is set (p. 11). * * In case this won't work, try pca_reset() * instead. */ pca_start(adap); goto out; case 0x58: /* Data byte has been received; NOT ACK has been returned */ if (numbytes == msg->len - 1) { pca_rx_byte(adap, &msg->buf[numbytes], 0); curmsg++; numbytes = 0; if (curmsg == num) pca_stop(adap); else completed = pca_repeated_start(adap); } else { DEB2("NOT ACK sent after data byte received. " "Not final byte. numbytes %d. len %d\n", numbytes, msg->len); pca_stop(adap); goto out; } break; case 0x70: /* Bus error - SDA stuck low */ DEB2("BUS ERROR - SDA Stuck low\n"); pca_reset(adap); goto out; case 0x90: /* Bus error - SCL stuck low */ DEB2("BUS ERROR - SCL Stuck low\n"); pca_reset(adap); goto out; case 0x00: /* Bus error during master or slave mode due to illegal START or STOP condition */ DEB2("BUS ERROR - Illegal START or STOP\n"); pca_reset(adap); goto out; default: dev_err(&i2c_adap->dev, "unhandled SIO state 0x%02x\n", state); break; } if (!completed) goto out; } ret = curmsg; out: DEB1("}}} transfered %d/%d messages. " "status is %#04x. control is %#04x\n", curmsg, num, pca_status(adap), pca_get_con(adap)); return ret; }
static int pca_init(struct i2c_adapter *adap) { struct i2c_algo_pca_data *pca_data = adap->algo_data; adap->algo = &pca_algo; if (pca_probe_chip(adap) == I2C_PCA_CHIP_9564) { static int freqs[] = {330, 288, 217, 146, 88, 59, 44, 36}; int clock; if (pca_data->i2c_clock > 7) { switch (pca_data->i2c_clock) { case 330000: pca_data->i2c_clock = I2C_PCA_CON_330kHz; break; case 288000: pca_data->i2c_clock = I2C_PCA_CON_288kHz; break; case 217000: pca_data->i2c_clock = I2C_PCA_CON_217kHz; break; case 146000: pca_data->i2c_clock = I2C_PCA_CON_146kHz; break; case 88000: pca_data->i2c_clock = I2C_PCA_CON_88kHz; break; case 59000: pca_data->i2c_clock = I2C_PCA_CON_59kHz; break; case 44000: pca_data->i2c_clock = I2C_PCA_CON_44kHz; break; case 36000: pca_data->i2c_clock = I2C_PCA_CON_36kHz; break; default: printk(KERN_WARNING "%s: Invalid I2C clock speed selected." " Using default 59kHz.\n", adap->name); pca_data->i2c_clock = I2C_PCA_CON_59kHz; } } else { printk(KERN_WARNING "%s: " "Choosing the clock frequency based on " "index is deprecated." " Use the nominal frequency.\n", adap->name); } pca_reset(pca_data); clock = pca_clock(pca_data); printk(KERN_INFO "%s: Clock frequency is %dkHz\n", adap->name, freqs[clock]); pca_set_con(pca_data, I2C_PCA_CON_ENSIO | clock); } else { int clock; int mode; int tlow, thi; /* Values can be found on PCA9665 datasheet section 7.3.2.6 */ int min_tlow, min_thi; /* These values are the maximum raise and fall values allowed * by the I2C operation mode (Standard, Fast or Fast+) * They are used (added) below to calculate the clock dividers * of PCA9665. Note that they are slightly different of the * real maximum, to allow the change on mode exactly on the * maximum clock rate for each mode */ int raise_fall_time; /* Ignore the reset function from the module, * we can use the parallel bus reset */ pca_data->reset_chip = pca9665_reset; if (pca_data->i2c_clock > 1265800) { printk(KERN_WARNING "%s: I2C clock speed too high." " Using 1265.8kHz.\n", adap->name); pca_data->i2c_clock = 1265800; } if (pca_data->i2c_clock < 60300) { printk(KERN_WARNING "%s: I2C clock speed too low." " Using 60.3kHz.\n", adap->name); pca_data->i2c_clock = 60300; } /* To avoid integer overflow, use clock/100 for calculations */ clock = pca_clock(pca_data) / 100; if (pca_data->i2c_clock > 10000) { mode = I2C_PCA_MODE_TURBO; min_tlow = 14; min_thi = 5; raise_fall_time = 22; /* Raise 11e-8s, Fall 11e-8s */ } else if (pca_data->i2c_clock > 4000) { mode = I2C_PCA_MODE_FASTP; min_tlow = 17; min_thi = 9; raise_fall_time = 22; /* Raise 11e-8s, Fall 11e-8s */ } else if (pca_data->i2c_clock > 1000) { mode = I2C_PCA_MODE_FAST; min_tlow = 44; min_thi = 20; raise_fall_time = 58; /* Raise 29e-8s, Fall 29e-8s */ } else { mode = I2C_PCA_MODE_STD; min_tlow = 157; min_thi = 134; raise_fall_time = 127; /* Raise 29e-8s, Fall 98e-8s */ } /* The minimum clock that respects the thi/tlow = 134/157 is * 64800 Hz. Below that, we have to fix the tlow to 255 and * calculate the thi factor. */ if (clock < 648) { tlow = 255; thi = 1000000 - clock * raise_fall_time; thi /= (I2C_PCA_OSC_PER * clock) - tlow; } else { tlow = (1000000 - clock * raise_fall_time) * min_tlow; tlow /= I2C_PCA_OSC_PER * clock * (min_thi + min_tlow); thi = tlow * min_thi / min_tlow; } pca_reset(pca_data); printk(KERN_INFO "%s: Clock frequency is %dHz\n", adap->name, clock * 100); pca_outw(pca_data, I2C_PCA_INDPTR, I2C_PCA_IMODE); pca_outw(pca_data, I2C_PCA_IND, mode); pca_outw(pca_data, I2C_PCA_INDPTR, I2C_PCA_ISCLL); pca_outw(pca_data, I2C_PCA_IND, tlow); pca_outw(pca_data, I2C_PCA_INDPTR, I2C_PCA_ISCLH); pca_outw(pca_data, I2C_PCA_IND, thi); pca_set_con(pca_data, I2C_PCA_CON_ENSIO); } udelay(500); /* 500 us for oscilator to stabilise */ return 0; }
static int pca_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg msgs[], int num) { struct i2c_algo_pca_data *adap = i2c_adap->algo_data; struct i2c_msg *msg = NULL; int curmsg; int numbytes = 0; int state; state = pca_status(adap); if ( state != 0xF8 ) { printk(KERN_ERR DRIVER ": bus is not idle. status is %#04x\n", state ); /* FIXME: what to do. Force stop ? */ return -EREMOTEIO; } DEB1("{{{ XFER %d messages\n", num); if (i2c_debug>=2) { for (curmsg = 0; curmsg < num; curmsg++) { int addr, i; msg = &msgs[curmsg]; addr = (0x7f & msg->addr) ; if (msg->flags & I2C_M_RD ) printk(KERN_INFO " [%02d] RD %d bytes from %#02x [%#02x, ...]\n", curmsg, msg->len, addr, (addr<<1) | 1); else { printk(KERN_INFO " [%02d] WR %d bytes to %#02x [%#02x%s", curmsg, msg->len, addr, addr<<1, msg->len == 0 ? "" : ", "); for(i=0; i < msg->len; i++) printk("%#04x%s", msg->buf[i], i == msg->len - 1 ? "" : ", "); printk("]\n"); } } } curmsg = 0; while (curmsg < num) { state = pca_status(adap); DEB3("STATE is 0x%02x\n", state); msg = &msgs[curmsg]; switch (state) { case 0xf8: /* On reset or stop the bus is idle */ pca_start(adap); break; case 0x08: /* A START condition has been transmitted */ case 0x10: /* A repeated start condition has been transmitted */ pca_address(adap, msg); break; case 0x18: /* SLA+W has been transmitted; ACK has been received */ case 0x28: /* Data byte in I2CDAT has been transmitted; ACK has been received */ if (numbytes < msg->len) { pca_tx_byte(adap, msg->buf[numbytes]); numbytes++; break; } curmsg++; numbytes = 0; if (curmsg == num) pca_stop(adap); else pca_repeated_start(adap); break; case 0x20: /* SLA+W has been transmitted; NOT ACK has been received */ DEB2("NOT ACK received after SLA+W\n"); pca_stop(adap); return -EREMOTEIO; case 0x40: /* SLA+R has been transmitted; ACK has been received */ pca_rx_ack(adap, msg->len > 1); break; case 0x50: /* Data bytes has been received; ACK has been returned */ if (numbytes < msg->len) { pca_rx_byte(adap, &msg->buf[numbytes], 1); numbytes++; pca_rx_ack(adap, numbytes < msg->len - 1); break; } curmsg++; numbytes = 0; if (curmsg == num) pca_stop(adap); else pca_repeated_start(adap); break; case 0x48: /* SLA+R has been transmitted; NOT ACK has been received */ DEB2("NOT ACK received after SLA+R\n"); pca_stop(adap); return -EREMOTEIO; case 0x30: /* Data byte in I2CDAT has been transmitted; NOT ACK has been received */ DEB2("NOT ACK received after data byte\n"); return -EREMOTEIO; case 0x38: /* Arbitration lost during SLA+W, SLA+R or data bytes */ DEB2("Arbitration lost\n"); return -EREMOTEIO; case 0x58: /* Data byte has been received; NOT ACK has been returned */ if ( numbytes == msg->len - 1 ) { pca_rx_byte(adap, &msg->buf[numbytes], 0); curmsg++; numbytes = 0; if (curmsg == num) pca_stop(adap); else pca_repeated_start(adap); } else { DEB2("NOT ACK sent after data byte received. " "Not final byte. numbytes %d. len %d\n", numbytes, msg->len); pca_stop(adap); return -EREMOTEIO; } break; case 0x70: /* Bus error - SDA stuck low */ DEB2("BUS ERROR - SDA Stuck low\n"); pca_reset(adap); return -EREMOTEIO; case 0x90: /* Bus error - SCL stuck low */ DEB2("BUS ERROR - SCL Stuck low\n"); pca_reset(adap); return -EREMOTEIO; case 0x00: /* Bus error during master or slave mode due to illegal START or STOP condition */ DEB2("BUS ERROR - Illegal START or STOP\n"); pca_reset(adap); return -EREMOTEIO; default: printk(KERN_ERR DRIVER ": unhandled SIO state 0x%02x\n", state); break; } } DEB1(KERN_CRIT "}}} transfered %d messages. " "status is %#04x. control is %#04x\n", num, pca_status(adap), pca_get_con(adap)); return curmsg; }