/* * Copyright 2003 through 2004 by Marc Aurele La France (TSI @ UQV), tsi@xfree86.org * * Permission to use, copy, modify, distribute, and sell this software and its * documentation for any purpose is hereby granted without fee, provided that * the above copyright notice appear in all copies and that both that copyright * notice and this permission notice appear in supporting documentation, and * that the name of Marc Aurele La France not be used in advertising or * publicity pertaining to distribution of the software without specific, * written prior permission. Marc Aurele La France makes no representations * about the suitability of this software for any purpose. It is provided * "as-is" without express or implied warranty. * * MARC AURELE LA FRANCE DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO * EVENT SHALL MARC AURELE LA FRANCE BE LIABLE FOR ANY SPECIAL, INDIRECT OR * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR * PERFORMANCE OF THIS SOFTWARE. */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include "atii2c.h" #include "atimach64i2c.h" #include "atistruct.h" #include "xf86.h" /* This is derived from GATOS code, with a liberal sprinkling of bug fixes */ /* * Some local macros for use by the mid-level I2C functions. */ #define ATII2CDelay \ (*pI2CBus->I2CUDelay)(pI2CBus, pI2CBus->HoldTime) #define ATII2CSCLDirOff \ if (pATII2C->SCLDir != 0) \ (*pATII2C->I2CSetBits)(pATII2C, pATI, \ pATII2C->I2CCur & ~pATII2C->SCLDir) #define ATII2CSCLDirOn \ if (pATII2C->SCLDir != 0) \ (*pATII2C->I2CSetBits)(pATII2C, pATI, \ pATII2C->I2CCur | pATII2C->SCLDir) #define ATII2CSDADirOff \ if (pATII2C->SDADir != 0) \ (*pATII2C->I2CSetBits)(pATII2C, pATI, \ pATII2C->I2CCur & ~pATII2C->SDADir) #define ATII2CSDADirOn \ if (pATII2C->SDADir != 0) \ (*pATII2C->I2CSetBits)(pATII2C, pATI, \ pATII2C->I2CCur | pATII2C->SDADir) #define ATII2CSCLBitGet \ ((*pATII2C->I2CGetBits)(pATI) & pATII2C->SCLGet) #define ATII2CSCLBitOff \ do \ { \ (*pATII2C->I2CSetBits)(pATII2C, pATI, \ pATII2C->I2CCur & ~pATII2C->SCLSet); \ ATII2CDelay; \ } while (0) #define ATII2CSCLBitOn \ do \ { \ (*pATII2C->I2CSetBits)(pATII2C, pATI, \ pATII2C->I2CCur | pATII2C->SCLSet); \ do /* Wait until all devices have released SCL */ \ { \ ATII2CDelay; \ } while (ATII2CSCLBitGet == 0); \ } while (0) #define ATII2CSDABitGet \ ((*pATII2C->I2CGetBits)(pATI) & pATII2C->SDAGet) #define ATII2CSDABitOff \ do \ { \ (*pATII2C->I2CSetBits)(pATII2C, pATI, \ pATII2C->I2CCur & ~pATII2C->SDASet); \ ATII2CDelay; \ } while (0) #define ATII2CSDABitOn \ do \ { \ (*pATII2C->I2CSetBits)(pATII2C, pATI, \ pATII2C->I2CCur | pATII2C->SDASet); \ ATII2CDelay; \ } while (0) #define ATII2CSDABitSet(_flag) \ do \ { \ if (_flag) \ ATII2CSDABitOn; \ else \ ATII2CSDABitOff; \ } while (0) /* * ATII2CStart -- * * This function puts a start signal on the I2C bus. */ static Bool ATII2CStart ( I2CBusPtr pI2CBus, int timeout ) { ATII2CPtr pATII2C = pI2CBus->DriverPrivate.ptr; ATIPtr pATI = pATII2C->pATI; (void)timeout; /* * Set I2C line directions to out-bound. SCL will remain out-bound until * next I2C Stop. */ ATII2CSCLDirOn; ATII2CSDADirOn; /* * Send Start bit. This is a pull-down of the data line while the clock * line is pulled up. */ ATII2CSDABitOn; ATII2CSCLBitOn; ATII2CSDABitOff; ATII2CSCLBitOff; return TRUE; } /* * ATII2CAddress -- * * This function puts an 8-bit address on the I2C bus. */ static Bool ATII2CAddress ( I2CDevPtr pI2CDev, I2CSlaveAddr Address ) { I2CBusPtr pI2CBus = pI2CDev->pI2CBus; /* Send low byte of device address */ if ((*pI2CBus->I2CPutByte)(pI2CDev, (I2CByte)Address)) { /* Send top byte of address, if appropriate */ if (((Address & 0x00F8U) != 0x00F0U) && ((Address & 0x00FEU) != 0x0000U)) return TRUE; if ((*pI2CBus->I2CPutByte)(pI2CDev, (I2CByte)(Address >> 8))) return TRUE; } /* Kill I2C transaction on failure */ (*pI2CBus->I2CStop)(pI2CDev); return FALSE; } /* * ATII2CStop -- * * This function puts a stop signal on the I2C bus. */ static void ATII2CStop ( I2CDevPtr pI2CDev ) { I2CBusPtr pI2CBus = pI2CDev->pI2CBus; ATII2CPtr pATII2C = pI2CBus->DriverPrivate.ptr; ATIPtr pATI = pATII2C->pATI; ATII2CSDADirOn; /* Set data line direction to out-bound */ /* * Send Stop bit. This is a pull-up of the data line while the clock line * is pulled up. */ ATII2CSDABitOff; ATII2CSCLBitOn; ATII2CSDABitOn; ATII2CSCLBitOff; /* Reset I2C line directions to in-bound */ ATII2CSCLDirOff; ATII2CSDADirOff; } /* * ATII2CPutByte -- * * This function puts an 8-bit value on the I2C bus, starting with its MSB. */ static Bool ATII2CPutByte ( I2CDevPtr pI2CDev, I2CByte Data ) { I2CBusPtr pI2CBus = pI2CDev->pI2CBus; ATII2CPtr pATII2C = pI2CBus->DriverPrivate.ptr; ATIPtr pATI = pATII2C->pATI; Bool Result; ATII2CSDADirOn; /* Set data line direction to out-bound */ /* Send data byte */ for (int i = 0; i < 8; i++) { ATII2CSDABitSet(Data & 0x80U); ATII2CSCLBitOn; ATII2CSCLBitOff; Data <<= 1; } ATII2CSDABitOn; /* Release data line */ ATII2CSDADirOff; /* Set data line direction to in-bound */ ATII2CSCLBitOn; /* Start bit-read clock pulse */ /* Get [N]ACK bit */ if (ATII2CSDABitGet) Result = FALSE; else Result = TRUE; ATII2CSCLBitOff; /* End clock pulse */ return Result; } /* * ATII2CGetByte -- * * This function retrieves an 8-bit value from the I2C bus. */ static Bool ATII2CGetByte ( I2CDevPtr pI2CDev, I2CByte *pData, Bool Last ) { I2CBusPtr pI2CBus = pI2CDev->pI2CBus; ATII2CPtr pATII2C = pI2CBus->DriverPrivate.ptr; ATIPtr pATI = pATII2C->pATI; unsigned long Value = 1; do { ATII2CSCLBitOn; /* Start bit-read clock pulse */ /* Accumulate bit into byte value */ Value <<= 1; if (ATII2CSDABitGet) Value++; ATII2CSCLBitOff; /* End clock pulse */ } while (Value <= (unsigned long)((I2CByte)(-1))); *pData = (I2CByte)Value; ATII2CSDADirOn; /* Set data line direction to out-bound */ /* Send [N]ACK bit */ ATII2CSDABitSet(Last); ATII2CSCLBitOn; ATII2CSCLBitOff; if (!Last) ATII2CSDABitOn; /* Release data line */ ATII2CSDADirOff; /* Set data line direction to in-bound */ return TRUE; } /* * ATICreateI2CBusRec -- * * This function is called to initialise an I2CBusRec. */ I2CBusPtr ATICreateI2CBusRec ( int iScreen, ATIPtr pATI, const char *BusName ) { I2CBusPtr pI2CBus; ATII2CPtr pATII2C = XNFcallocarray(1, SizeOf(ATII2CRec)); if (!(pI2CBus = xf86CreateI2CBusRec())) { xf86DrvMsg(iScreen, X_WARNING, "Unable to allocate I2C Bus record.\n"); free(pATII2C); return NULL; } /* Fill in generic structure fields */ pI2CBus->BusName = BusName; pI2CBus->scrnIndex = iScreen; pI2CBus->I2CAddress = ATII2CAddress; pI2CBus->I2CStart = ATII2CStart; pI2CBus->I2CStop = ATII2CStop; pI2CBus->I2CPutByte = ATII2CPutByte; pI2CBus->I2CGetByte = ATII2CGetByte; pI2CBus->DriverPrivate.ptr = pATII2C; pATII2C->pATI = pATI; if (xf86I2CBusInit(pI2CBus)) return pI2CBus; xf86DrvMsg(iScreen, X_WARNING, "I2C bus %s initialisation failure.\n", BusName); xf86DestroyI2CBusRec(pI2CBus, TRUE, TRUE); free(pATII2C); return NULL; } /* * ATII2CPreInit -- * * This is called by ATIPreInit() to create I2C bus record(s) for the adapter. */ void ATII2CPreInit ( ScrnInfoPtr pScreenInfo, ATIPtr pATI ) { if (!xf86LoadSubModule(pScreenInfo, "i2c")) return; ATIMach64I2CPreInit(pScreenInfo, pATI); } /* * ATII2CFreeScreen -- * * This is called by ATIFreeScreen() to remove the driver's I2C interface. */ void ATII2CFreeScreen ( int iScreen ) { I2CBusPtr *ppI2CBus; int nI2CBus; nI2CBus = xf86I2CGetScreenBuses(iScreen, &ppI2CBus); while (--nI2CBus >= 0) { I2CBusPtr pI2CBus = ppI2CBus[nI2CBus]; ATII2CPtr pATII2C = pI2CBus->DriverPrivate.ptr; xf86DestroyI2CBusRec(pI2CBus, TRUE, TRUE); free(pATII2C); } free(ppI2CBus); }