drivers/media/pci/mantis/mantis_i2c.c - vendor/opensource/backports - Git at Google

 /*
 	Mantis PCI bridge driver

 	Copyright (C) Manu Abraham (abraham.manu@gmail.com)

 	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; either version 2 of the License, or
 	(at your option) any later version.

 	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 <asm/io.h>
 #include <linux/ioport.h>
 #include <linux/pci.h>
 #include <linux/i2c.h>

 #include "dmxdev.h"
 #include "dvbdev.h"
 #include "dvb_demux.h"
 #include "dvb_frontend.h"
 #include "dvb_net.h"

 #include "mantis_common.h"
 #include "mantis_reg.h"
 #include "mantis_i2c.h"

 #define TRIALS			10000

 static int mantis_i2c_read(struct mantis_pci *mantis, const struct i2c_msg *msg)
 {
 	u32 rxd, i, stat, trials;

 	dprintk(MANTIS_INFO, 0, "        %s:  Address=[0x%02x] <R>[ ",
 		__func__, msg->addr);

 	for (i = 0; i < msg->len; i++) {
 		rxd = (msg->addr << 25) | (1 << 24)
 					| MANTIS_I2C_RATE_3
 					| MANTIS_I2C_STOP
 					| MANTIS_I2C_PGMODE;

 		if (i == (msg->len - 1))
 			rxd &= ~MANTIS_I2C_STOP;

 		mmwrite(MANTIS_INT_I2CDONE, MANTIS_INT_STAT);
 		mmwrite(rxd, MANTIS_I2CDATA_CTL);

 		/* wait for xfer completion */
 		for (trials = 0; trials < TRIALS; trials++) {
 			stat = mmread(MANTIS_INT_STAT);
 			if (stat & MANTIS_INT_I2CDONE)
 				break;
 		}

 		dprintk(MANTIS_TMG, 0, "I2CDONE: trials=%d\n", trials);

 		/* wait for xfer completion */
 		for (trials = 0; trials < TRIALS; trials++) {
 			stat = mmread(MANTIS_INT_STAT);
 			if (stat & MANTIS_INT_I2CRACK)
 				break;
 		}

 		dprintk(MANTIS_TMG, 0, "I2CRACK: trials=%d\n", trials);

 		rxd = mmread(MANTIS_I2CDATA_CTL);
 		msg->buf[i] = (u8)((rxd >> 8) & 0xFF);
 		dprintk(MANTIS_INFO, 0, "%02x ", msg->buf[i]);
 	}
 	dprintk(MANTIS_INFO, 0, "]\n");

 	return 0;
 }

 static int mantis_i2c_write(struct mantis_pci *mantis, const struct i2c_msg *msg)
 {
 	int i;
 	u32 txd = 0, stat, trials;

 	dprintk(MANTIS_INFO, 0, "        %s: Address=[0x%02x] <W>[ ",
 		__func__, msg->addr);

 	for (i = 0; i < msg->len; i++) {
 		dprintk(MANTIS_INFO, 0, "%02x ", msg->buf[i]);
 		txd = (msg->addr << 25) | (msg->buf[i] << 8)
 					| MANTIS_I2C_RATE_3
 					| MANTIS_I2C_STOP
 					| MANTIS_I2C_PGMODE;

 		if (i == (msg->len - 1))
 			txd &= ~MANTIS_I2C_STOP;

 		mmwrite(MANTIS_INT_I2CDONE, MANTIS_INT_STAT);
 		mmwrite(txd, MANTIS_I2CDATA_CTL);

 		/* wait for xfer completion */
 		for (trials = 0; trials < TRIALS; trials++) {
 			stat = mmread(MANTIS_INT_STAT);
 			if (stat & MANTIS_INT_I2CDONE)
 				break;
 		}

 		dprintk(MANTIS_TMG, 0, "I2CDONE: trials=%d\n", trials);

 		/* wait for xfer completion */
 		for (trials = 0; trials < TRIALS; trials++) {
 			stat = mmread(MANTIS_INT_STAT);
 			if (stat & MANTIS_INT_I2CRACK)
 				break;
 		}

 		dprintk(MANTIS_TMG, 0, "I2CRACK: trials=%d\n", trials);
 	}
 	dprintk(MANTIS_INFO, 0, "]\n");

 	return 0;
 }

 static int mantis_i2c_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int num)
 {
 	int ret = 0, i = 0, trials;
 	u32 stat, data, txd;
 	struct mantis_pci *mantis;
 	struct mantis_hwconfig *config;

 	mantis = i2c_get_adapdata(adapter);
 	BUG_ON(!mantis);
 	config = mantis->hwconfig;
 	BUG_ON(!config);

 	dprintk(MANTIS_DEBUG, 1, "Messages:%d", num);
 	mutex_lock(&mantis->i2c_lock);

 	while (i < num) {
 		/* Byte MODE */
 		if ((config->i2c_mode & MANTIS_BYTE_MODE) &&
 		    ((i + 1) < num)			&&
 		    (msgs[i].len < 2)			&&
 		    (msgs[i + 1].len < 2)		&&
 		    (msgs[i + 1].flags & I2C_M_RD)) {

 			dprintk(MANTIS_DEBUG, 0, "        Byte MODE:\n");

 			/* Read operation */
 			txd = msgs[i].addr << 25 | (0x1 << 24)
 						 | (msgs[i].buf[0] << 16)
 						 | MANTIS_I2C_RATE_3;

 			mmwrite(txd, MANTIS_I2CDATA_CTL);
 			/* wait for xfer completion */
 			for (trials = 0; trials < TRIALS; trials++) {
 				stat = mmread(MANTIS_INT_STAT);
 				if (stat & MANTIS_INT_I2CDONE)
 					break;
 			}

 			/* check for xfer completion */
 			if (stat & MANTIS_INT_I2CDONE) {
 				/* check xfer was acknowledged */
 				if (stat & MANTIS_INT_I2CRACK) {
 					data = mmread(MANTIS_I2CDATA_CTL);
 					msgs[i + 1].buf[0] = (data >> 8) & 0xff;
 					dprintk(MANTIS_DEBUG, 0, "        Byte <%d> RXD=0x%02x  [%02x]\n", 0x0, data, msgs[i + 1].buf[0]);
 				} else {
 					/* I/O error */
 					dprintk(MANTIS_ERROR, 1, "        I/O error, LINE:%d", __LINE__);
 					ret = -EIO;
 					break;
 				}
 			} else {
 				/* I/O error */
 				dprintk(MANTIS_ERROR, 1, "        I/O error, LINE:%d", __LINE__);
 				ret = -EIO;
 				break;
 			}
 			i += 2; /* Write/Read operation in one go */
 		}

 		if (i < num) {
 			if (msgs[i].flags & I2C_M_RD)
 				ret = mantis_i2c_read(mantis, &msgs[i]);
 			else
 				ret = mantis_i2c_write(mantis, &msgs[i]);

 			i++;
 			if (ret < 0)
 				goto bail_out;
 		}

 	}

 	mutex_unlock(&mantis->i2c_lock);

 	return num;

 bail_out:
 	mutex_unlock(&mantis->i2c_lock);
 	return ret;
 }

 static u32 mantis_i2c_func(struct i2c_adapter *adapter)
 {
 	return I2C_FUNC_SMBUS_EMUL;
 }

 static struct i2c_algorithm mantis_algo = {
 	.master_xfer		= mantis_i2c_xfer,
 	.functionality		= mantis_i2c_func,
 };

 int mantis_i2c_init(struct mantis_pci *mantis)
 {
 	u32 intstat;
 	struct i2c_adapter *i2c_adapter = &mantis->adapter;
 	struct pci_dev *pdev		= mantis->pdev;

 	init_waitqueue_head(&mantis->i2c_wq);
 	mutex_init(&mantis->i2c_lock);
 	strncpy(i2c_adapter->name, "Mantis I2C", sizeof(i2c_adapter->name));
 	i2c_set_adapdata(i2c_adapter, mantis);

 	i2c_adapter->owner	= THIS_MODULE;
 	i2c_adapter->algo	= &mantis_algo;
 	i2c_adapter->algo_data	= NULL;
 	i2c_adapter->timeout	= 500;
 	i2c_adapter->retries	= 3;
 	i2c_adapter->dev.parent	= &pdev->dev;

 	mantis->i2c_rc		= i2c_add_adapter(i2c_adapter);
 	if (mantis->i2c_rc < 0)
 		return mantis->i2c_rc;

 	dprintk(MANTIS_DEBUG, 1, "Initializing I2C ..");

 	intstat = mmread(MANTIS_INT_STAT);
 	mmread(MANTIS_INT_MASK);
 	mmwrite(intstat, MANTIS_INT_STAT);
 	dprintk(MANTIS_DEBUG, 1, "Disabling I2C interrupt");
 	mantis_mask_ints(mantis, MANTIS_INT_I2CDONE);

 	return 0;
 }
 EXPORT_SYMBOL_GPL(mantis_i2c_init);

 int mantis_i2c_exit(struct mantis_pci *mantis)
 {
 	dprintk(MANTIS_DEBUG, 1, "Disabling I2C interrupt");
 	mantis_mask_ints(mantis, MANTIS_INT_I2CDONE);

 	dprintk(MANTIS_DEBUG, 1, "Removing I2C adapter");
 	i2c_del_adapter(&mantis->adapter);

 	return 0;
 }
 EXPORT_SYMBOL_GPL(mantis_i2c_exit);
	/*
	Mantis PCI bridge driver

	Copyright (C) Manu Abraham (abraham.manu@gmail.com)

	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; either version 2 of the License, or
	(at your option) any later version.

	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 <asm/io.h>
	#include <linux/ioport.h>
	#include <linux/pci.h>
	#include <linux/i2c.h>

	#include "dmxdev.h"
	#include "dvbdev.h"
	#include "dvb_demux.h"
	#include "dvb_frontend.h"
	#include "dvb_net.h"

	#include "mantis_common.h"
	#include "mantis_reg.h"
	#include "mantis_i2c.h"

	#define TRIALS 10000

	static int mantis_i2c_read(struct mantis_pci mantis, const struct i2c_msg msg)
	{
	u32 rxd, i, stat, trials;

	dprintk(MANTIS_INFO, 0, " %s: Address=[0x%02x] <R>[ ",
	__func__, msg->addr);

	for (i = 0; i < msg->len; i++) {
	rxd = (msg->addr << 25) \| (1 << 24)
	\| MANTIS_I2C_RATE_3
	\| MANTIS_I2C_STOP
	\| MANTIS_I2C_PGMODE;

	if (i == (msg->len - 1))
	rxd &= ~MANTIS_I2C_STOP;

	mmwrite(MANTIS_INT_I2CDONE, MANTIS_INT_STAT);
	mmwrite(rxd, MANTIS_I2CDATA_CTL);

	/* wait for xfer completion */
	for (trials = 0; trials < TRIALS; trials++) {
	stat = mmread(MANTIS_INT_STAT);
	if (stat & MANTIS_INT_I2CDONE)
	break;
	}

	dprintk(MANTIS_TMG, 0, "I2CDONE: trials=%d\n", trials);

	/* wait for xfer completion */
	for (trials = 0; trials < TRIALS; trials++) {
	stat = mmread(MANTIS_INT_STAT);
	if (stat & MANTIS_INT_I2CRACK)
	break;
	}

	dprintk(MANTIS_TMG, 0, "I2CRACK: trials=%d\n", trials);

	rxd = mmread(MANTIS_I2CDATA_CTL);
	msg->buf[i] = (u8)((rxd >> 8) & 0xFF);
	dprintk(MANTIS_INFO, 0, "%02x ", msg->buf[i]);
	}
	dprintk(MANTIS_INFO, 0, "]\n");

	return 0;
	}

	static int mantis_i2c_write(struct mantis_pci mantis, const struct i2c_msg msg)
	{
	int i;
	u32 txd = 0, stat, trials;

	dprintk(MANTIS_INFO, 0, " %s: Address=[0x%02x] <W>[ ",
	__func__, msg->addr);

	for (i = 0; i < msg->len; i++) {
	dprintk(MANTIS_INFO, 0, "%02x ", msg->buf[i]);
	txd = (msg->addr << 25) \| (msg->buf[i] << 8)
	\| MANTIS_I2C_RATE_3
	\| MANTIS_I2C_STOP
	\| MANTIS_I2C_PGMODE;

	if (i == (msg->len - 1))
	txd &= ~MANTIS_I2C_STOP;

	mmwrite(MANTIS_INT_I2CDONE, MANTIS_INT_STAT);
	mmwrite(txd, MANTIS_I2CDATA_CTL);

	/* wait for xfer completion */
	for (trials = 0; trials < TRIALS; trials++) {
	stat = mmread(MANTIS_INT_STAT);
	if (stat & MANTIS_INT_I2CDONE)
	break;
	}

	dprintk(MANTIS_TMG, 0, "I2CDONE: trials=%d\n", trials);

	/* wait for xfer completion */
	for (trials = 0; trials < TRIALS; trials++) {
	stat = mmread(MANTIS_INT_STAT);
	if (stat & MANTIS_INT_I2CRACK)
	break;
	}

	dprintk(MANTIS_TMG, 0, "I2CRACK: trials=%d\n", trials);
	}
	dprintk(MANTIS_INFO, 0, "]\n");

	return 0;
	}

	static int mantis_i2c_xfer(struct i2c_adapter adapter, struct i2c_msg msgs, int num)
	{
	int ret = 0, i = 0, trials;
	u32 stat, data, txd;
	struct mantis_pci *mantis;
	struct mantis_hwconfig *config;

	mantis = i2c_get_adapdata(adapter);
	BUG_ON(!mantis);
	config = mantis->hwconfig;
	BUG_ON(!config);

	dprintk(MANTIS_DEBUG, 1, "Messages:%d", num);
	mutex_lock(&mantis->i2c_lock);

	while (i < num) {
	/* Byte MODE */
	if ((config->i2c_mode & MANTIS_BYTE_MODE) &&
	((i + 1) < num) &&
	(msgs[i].len < 2) &&
	(msgs[i + 1].len < 2) &&
	(msgs[i + 1].flags & I2C_M_RD)) {

	dprintk(MANTIS_DEBUG, 0, " Byte MODE:\n");

	/* Read operation */
	txd = msgs[i].addr << 25 \| (0x1 << 24)
	\| (msgs[i].buf[0] << 16)
	\| MANTIS_I2C_RATE_3;

	mmwrite(txd, MANTIS_I2CDATA_CTL);
	/* wait for xfer completion */
	for (trials = 0; trials < TRIALS; trials++) {
	stat = mmread(MANTIS_INT_STAT);
	if (stat & MANTIS_INT_I2CDONE)
	break;
	}

	/* check for xfer completion */
	if (stat & MANTIS_INT_I2CDONE) {
	/* check xfer was acknowledged */
	if (stat & MANTIS_INT_I2CRACK) {
	data = mmread(MANTIS_I2CDATA_CTL);
	msgs[i + 1].buf[0] = (data >> 8) & 0xff;
	dprintk(MANTIS_DEBUG, 0, " Byte <%d> RXD=0x%02x [%02x]\n", 0x0, data, msgs[i + 1].buf[0]);
	} else {
	/* I/O error */
	dprintk(MANTIS_ERROR, 1, " I/O error, LINE:%d", __LINE__);
	ret = -EIO;
	break;
	}
	} else {
	/* I/O error */
	dprintk(MANTIS_ERROR, 1, " I/O error, LINE:%d", __LINE__);
	ret = -EIO;
	break;
	}
	i += 2; /* Write/Read operation in one go */
	}

	if (i < num) {
	if (msgs[i].flags & I2C_M_RD)
	ret = mantis_i2c_read(mantis, &msgs[i]);
	else
	ret = mantis_i2c_write(mantis, &msgs[i]);

	i++;
	if (ret < 0)
	goto bail_out;
	}

	}

	mutex_unlock(&mantis->i2c_lock);

	return num;

	bail_out:
	mutex_unlock(&mantis->i2c_lock);
	return ret;
	}

	static u32 mantis_i2c_func(struct i2c_adapter *adapter)
	{
	return I2C_FUNC_SMBUS_EMUL;
	}

	static struct i2c_algorithm mantis_algo = {
	.master_xfer = mantis_i2c_xfer,
	.functionality = mantis_i2c_func,
	};

	int mantis_i2c_init(struct mantis_pci *mantis)
	{
	u32 intstat;
	struct i2c_adapter *i2c_adapter = &mantis->adapter;
	struct pci_dev *pdev = mantis->pdev;

	init_waitqueue_head(&mantis->i2c_wq);
	mutex_init(&mantis->i2c_lock);
	strncpy(i2c_adapter->name, "Mantis I2C", sizeof(i2c_adapter->name));
	i2c_set_adapdata(i2c_adapter, mantis);

	i2c_adapter->owner = THIS_MODULE;
	i2c_adapter->algo = &mantis_algo;
	i2c_adapter->algo_data = NULL;
	i2c_adapter->timeout = 500;
	i2c_adapter->retries = 3;
	i2c_adapter->dev.parent = &pdev->dev;

	mantis->i2c_rc = i2c_add_adapter(i2c_adapter);
	if (mantis->i2c_rc < 0)
	return mantis->i2c_rc;

	dprintk(MANTIS_DEBUG, 1, "Initializing I2C ..");

	intstat = mmread(MANTIS_INT_STAT);
	mmread(MANTIS_INT_MASK);
	mmwrite(intstat, MANTIS_INT_STAT);
	dprintk(MANTIS_DEBUG, 1, "Disabling I2C interrupt");
	mantis_mask_ints(mantis, MANTIS_INT_I2CDONE);

	return 0;
	}
	EXPORT_SYMBOL_GPL(mantis_i2c_init);

	int mantis_i2c_exit(struct mantis_pci *mantis)
	{
	dprintk(MANTIS_DEBUG, 1, "Disabling I2C interrupt");
	mantis_mask_ints(mantis, MANTIS_INT_I2CDONE);

	dprintk(MANTIS_DEBUG, 1, "Removing I2C adapter");
	i2c_del_adapter(&mantis->adapter);

	return 0;
	}
	EXPORT_SYMBOL_GPL(mantis_i2c_exit);