drivers/video/via/via_i2c.c - kernel/bruno - Git at Google

 /*
  * Copyright 1998-2009 VIA Technologies, Inc. All Rights Reserved.
  * Copyright 2001-2008 S3 Graphics, Inc. All Rights Reserved.

  * 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, or (at your option) any later version.

  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTIES OR REPRESENTATIONS; 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.,
  * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  */

 #include <linux/platform_device.h>
 #include <linux/delay.h>
 #include <linux/spinlock.h>
 #include <linux/module.h>
 #include <linux/via-core.h>
 #include <linux/via_i2c.h>

 /*
  * There can only be one set of these, so there's no point in having
  * them be dynamically allocated...
  */
 #define VIAFB_NUM_I2C		5
 static struct via_i2c_stuff via_i2c_par[VIAFB_NUM_I2C];
 struct viafb_dev *i2c_vdev;  /* Passed in from core */

 static void via_i2c_setscl(void *data, int state)
 {
 	u8 val;
 	struct via_port_cfg *adap_data = data;
 	unsigned long flags;

 	spin_lock_irqsave(&i2c_vdev->reg_lock, flags);
 	val = via_read_reg(adap_data->io_port, adap_data->ioport_index) & 0xF0;
 	if (state)
 		val |= 0x20;
 	else
 		val &= ~0x20;
 	switch (adap_data->type) {
 	case VIA_PORT_I2C:
 		val |= 0x01;
 		break;
 	case VIA_PORT_GPIO:
 		val |= 0x80;
 		break;
 	default:
 		printk(KERN_ERR "viafb_i2c: specify wrong i2c type.\n");
 	}
 	via_write_reg(adap_data->io_port, adap_data->ioport_index, val);
 	spin_unlock_irqrestore(&i2c_vdev->reg_lock, flags);
 }

 static int via_i2c_getscl(void *data)
 {
 	struct via_port_cfg *adap_data = data;
 	unsigned long flags;
 	int ret = 0;

 	spin_lock_irqsave(&i2c_vdev->reg_lock, flags);
 	if (via_read_reg(adap_data->io_port, adap_data->ioport_index) & 0x08)
 		ret = 1;
 	spin_unlock_irqrestore(&i2c_vdev->reg_lock, flags);
 	return ret;
 }

 static int via_i2c_getsda(void *data)
 {
 	struct via_port_cfg *adap_data = data;
 	unsigned long flags;
 	int ret = 0;

 	spin_lock_irqsave(&i2c_vdev->reg_lock, flags);
 	if (via_read_reg(adap_data->io_port, adap_data->ioport_index) & 0x04)
 		ret = 1;
 	spin_unlock_irqrestore(&i2c_vdev->reg_lock, flags);
 	return ret;
 }

 static void via_i2c_setsda(void *data, int state)
 {
 	u8 val;
 	struct via_port_cfg *adap_data = data;
 	unsigned long flags;

 	spin_lock_irqsave(&i2c_vdev->reg_lock, flags);
 	val = via_read_reg(adap_data->io_port, adap_data->ioport_index) & 0xF0;
 	if (state)
 		val |= 0x10;
 	else
 		val &= ~0x10;
 	switch (adap_data->type) {
 	case VIA_PORT_I2C:
 		val |= 0x01;
 		break;
 	case VIA_PORT_GPIO:
 		val |= 0x40;
 		break;
 	default:
 		printk(KERN_ERR "viafb_i2c: specify wrong i2c type.\n");
 	}
 	via_write_reg(adap_data->io_port, adap_data->ioport_index, val);
 	spin_unlock_irqrestore(&i2c_vdev->reg_lock, flags);
 }

 int viafb_i2c_readbyte(u8 adap, u8 slave_addr, u8 index, u8 *pdata)
 {
 	int ret;
 	u8 mm1[] = {0x00};
 	struct i2c_msg msgs[2];

 	if (!via_i2c_par[adap].is_active)
 		return -ENODEV;
 	*pdata = 0;
 	msgs[0].flags = 0;
 	msgs[1].flags = I2C_M_RD;
 	msgs[0].addr = msgs[1].addr = slave_addr / 2;
 	mm1[0] = index;
 	msgs[0].len = 1; msgs[1].len = 1;
 	msgs[0].buf = mm1; msgs[1].buf = pdata;
 	ret = i2c_transfer(&via_i2c_par[adap].adapter, msgs, 2);
 	if (ret == 2)
 		ret = 0;
 	else if (ret >= 0)
 		ret = -EIO;

 	return ret;
 }

 int viafb_i2c_writebyte(u8 adap, u8 slave_addr, u8 index, u8 data)
 {
 	int ret;
 	u8 msg[2] = { index, data };
 	struct i2c_msg msgs;

 	if (!via_i2c_par[adap].is_active)
 		return -ENODEV;
 	msgs.flags = 0;
 	msgs.addr = slave_addr / 2;
 	msgs.len = 2;
 	msgs.buf = msg;
 	ret = i2c_transfer(&via_i2c_par[adap].adapter, &msgs, 1);
 	if (ret == 1)
 		ret = 0;
 	else if (ret >= 0)
 		ret = -EIO;

 	return ret;
 }

 int viafb_i2c_readbytes(u8 adap, u8 slave_addr, u8 index, u8 *buff, int buff_len)
 {
 	int ret;
 	u8 mm1[] = {0x00};
 	struct i2c_msg msgs[2];

 	if (!via_i2c_par[adap].is_active)
 		return -ENODEV;
 	msgs[0].flags = 0;
 	msgs[1].flags = I2C_M_RD;
 	msgs[0].addr = msgs[1].addr = slave_addr / 2;
 	mm1[0] = index;
 	msgs[0].len = 1; msgs[1].len = buff_len;
 	msgs[0].buf = mm1; msgs[1].buf = buff;
 	ret = i2c_transfer(&via_i2c_par[adap].adapter, msgs, 2);
 	if (ret == 2)
 		ret = 0;
 	else if (ret >= 0)
 		ret = -EIO;

 	return ret;
 }

 /*
  * Allow other viafb subdevices to look up a specific adapter
  * by port name.
  */
 struct i2c_adapter *viafb_find_i2c_adapter(enum viafb_i2c_adap which)
 {
 	struct via_i2c_stuff *stuff = &via_i2c_par[which];

 	return &stuff->adapter;
 }
 EXPORT_SYMBOL_GPL(viafb_find_i2c_adapter);


 static int create_i2c_bus(struct i2c_adapter *adapter,
 			  struct i2c_algo_bit_data *algo,
 			  struct via_port_cfg *adap_cfg,
 			  struct pci_dev *pdev)
 {
 	algo->setsda = via_i2c_setsda;
 	algo->setscl = via_i2c_setscl;
 	algo->getsda = via_i2c_getsda;
 	algo->getscl = via_i2c_getscl;
 	algo->udelay = 10;
 	algo->timeout = 2;
 	algo->data = adap_cfg;

 	sprintf(adapter->name, "viafb i2c io_port idx 0x%02x",
 		adap_cfg->ioport_index);
 	adapter->owner = THIS_MODULE;
 	adapter->id = 0x01FFFF;
 	adapter->class = I2C_CLASS_DDC;
 	adapter->algo_data = algo;
 	if (pdev)
 		adapter->dev.parent = &pdev->dev;
 	else
 		adapter->dev.parent = NULL;
 	/* i2c_set_adapdata(adapter, adap_cfg); */

 	/* Raise SCL and SDA */
 	via_i2c_setsda(adap_cfg, 1);
 	via_i2c_setscl(adap_cfg, 1);
 	udelay(20);

 	return i2c_bit_add_bus(adapter);
 }

 static int viafb_i2c_probe(struct platform_device *platdev)
 {
 	int i, ret;
 	struct via_port_cfg *configs;

 	i2c_vdev = platdev->dev.platform_data;
 	configs = i2c_vdev->port_cfg;

 	for (i = 0; i < VIAFB_NUM_PORTS; i++) {
 		struct via_port_cfg *adap_cfg = configs++;
 		struct via_i2c_stuff *i2c_stuff = &via_i2c_par[i];

 		i2c_stuff->is_active = 0;
 		if (adap_cfg->type == 0 || adap_cfg->mode != VIA_MODE_I2C)
 			continue;
 		ret = create_i2c_bus(&i2c_stuff->adapter,
 				     &i2c_stuff->algo, adap_cfg,
 				NULL); /* FIXME: PCIDEV */
 		if (ret < 0) {
 			printk(KERN_ERR "viafb: cannot create i2c bus %u:%d\n",
 				i, ret);
 			continue;  /* Still try to make the rest */
 		}
 		i2c_stuff->is_active = 1;
 	}

 	return 0;
 }

 static int viafb_i2c_remove(struct platform_device *platdev)
 {
 	int i;

 	for (i = 0; i < VIAFB_NUM_PORTS; i++) {
 		struct via_i2c_stuff *i2c_stuff = &via_i2c_par[i];
 		/*
 		 * Only remove those entries in the array that we've
 		 * actually used (and thus initialized algo_data)
 		 */
 		if (i2c_stuff->is_active)
 			i2c_del_adapter(&i2c_stuff->adapter);
 	}
 	return 0;
 }

 static struct platform_driver via_i2c_driver = {
 	.driver = {
 		.name = "viafb-i2c",
 	},
 	.probe = viafb_i2c_probe,
 	.remove = viafb_i2c_remove,
 };

 int viafb_i2c_init(void)
 {
 	return platform_driver_register(&via_i2c_driver);
 }

 void viafb_i2c_exit(void)
 {
 	platform_driver_unregister(&via_i2c_driver);
 }
	/*
	* Copyright 1998-2009 VIA Technologies, Inc. All Rights Reserved.
	* Copyright 2001-2008 S3 Graphics, Inc. All Rights Reserved.

	* 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, or (at your option) any later version.

	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTIES OR REPRESENTATIONS; 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.,
	* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	*/

	#include <linux/platform_device.h>
	#include <linux/delay.h>
	#include <linux/spinlock.h>
	#include <linux/module.h>
	#include <linux/via-core.h>
	#include <linux/via_i2c.h>

	/*
	* There can only be one set of these, so there's no point in having
	* them be dynamically allocated...
	*/
	#define VIAFB_NUM_I2C 5
	static struct via_i2c_stuff via_i2c_par[VIAFB_NUM_I2C];
	struct viafb_dev i2c_vdev; / Passed in from core */

	static void via_i2c_setscl(void *data, int state)
	{
	u8 val;
	struct via_port_cfg *adap_data = data;
	unsigned long flags;

	spin_lock_irqsave(&i2c_vdev->reg_lock, flags);
	val = via_read_reg(adap_data->io_port, adap_data->ioport_index) & 0xF0;
	if (state)
	val \|= 0x20;
	else
	val &= ~0x20;
	switch (adap_data->type) {
	case VIA_PORT_I2C:
	val \|= 0x01;
	break;
	case VIA_PORT_GPIO:
	val \|= 0x80;
	break;
	default:
	printk(KERN_ERR "viafb_i2c: specify wrong i2c type.\n");
	}
	via_write_reg(adap_data->io_port, adap_data->ioport_index, val);
	spin_unlock_irqrestore(&i2c_vdev->reg_lock, flags);
	}

	static int via_i2c_getscl(void *data)
	{
	struct via_port_cfg *adap_data = data;
	unsigned long flags;
	int ret = 0;

	spin_lock_irqsave(&i2c_vdev->reg_lock, flags);
	if (via_read_reg(adap_data->io_port, adap_data->ioport_index) & 0x08)
	ret = 1;
	spin_unlock_irqrestore(&i2c_vdev->reg_lock, flags);
	return ret;
	}

	static int via_i2c_getsda(void *data)
	{
	struct via_port_cfg *adap_data = data;
	unsigned long flags;
	int ret = 0;

	spin_lock_irqsave(&i2c_vdev->reg_lock, flags);
	if (via_read_reg(adap_data->io_port, adap_data->ioport_index) & 0x04)
	ret = 1;
	spin_unlock_irqrestore(&i2c_vdev->reg_lock, flags);
	return ret;
	}

	static void via_i2c_setsda(void *data, int state)
	{
	u8 val;
	struct via_port_cfg *adap_data = data;
	unsigned long flags;

	spin_lock_irqsave(&i2c_vdev->reg_lock, flags);
	val = via_read_reg(adap_data->io_port, adap_data->ioport_index) & 0xF0;
	if (state)
	val \|= 0x10;
	else
	val &= ~0x10;
	switch (adap_data->type) {
	case VIA_PORT_I2C:
	val \|= 0x01;
	break;
	case VIA_PORT_GPIO:
	val \|= 0x40;
	break;
	default:
	printk(KERN_ERR "viafb_i2c: specify wrong i2c type.\n");
	}
	via_write_reg(adap_data->io_port, adap_data->ioport_index, val);
	spin_unlock_irqrestore(&i2c_vdev->reg_lock, flags);
	}

	int viafb_i2c_readbyte(u8 adap, u8 slave_addr, u8 index, u8 *pdata)
	{
	int ret;
	u8 mm1[] = {0x00};
	struct i2c_msg msgs[2];

	if (!via_i2c_par[adap].is_active)
	return -ENODEV;
	*pdata = 0;
	msgs[0].flags = 0;
	msgs[1].flags = I2C_M_RD;
	msgs[0].addr = msgs[1].addr = slave_addr / 2;
	mm1[0] = index;
	msgs[0].len = 1; msgs[1].len = 1;
	msgs[0].buf = mm1; msgs[1].buf = pdata;
	ret = i2c_transfer(&via_i2c_par[adap].adapter, msgs, 2);
	if (ret == 2)
	ret = 0;
	else if (ret >= 0)
	ret = -EIO;

	return ret;
	}

	int viafb_i2c_writebyte(u8 adap, u8 slave_addr, u8 index, u8 data)
	{
	int ret;
	u8 msg[2] = { index, data };
	struct i2c_msg msgs;

	if (!via_i2c_par[adap].is_active)
	return -ENODEV;
	msgs.flags = 0;
	msgs.addr = slave_addr / 2;
	msgs.len = 2;
	msgs.buf = msg;
	ret = i2c_transfer(&via_i2c_par[adap].adapter, &msgs, 1);
	if (ret == 1)
	ret = 0;
	else if (ret >= 0)
	ret = -EIO;

	return ret;
	}

	int viafb_i2c_readbytes(u8 adap, u8 slave_addr, u8 index, u8 *buff, int buff_len)
	{
	int ret;
	u8 mm1[] = {0x00};
	struct i2c_msg msgs[2];

	if (!via_i2c_par[adap].is_active)
	return -ENODEV;
	msgs[0].flags = 0;
	msgs[1].flags = I2C_M_RD;
	msgs[0].addr = msgs[1].addr = slave_addr / 2;
	mm1[0] = index;
	msgs[0].len = 1; msgs[1].len = buff_len;
	msgs[0].buf = mm1; msgs[1].buf = buff;
	ret = i2c_transfer(&via_i2c_par[adap].adapter, msgs, 2);
	if (ret == 2)
	ret = 0;
	else if (ret >= 0)
	ret = -EIO;

	return ret;
	}

	/*
	* Allow other viafb subdevices to look up a specific adapter
	* by port name.
	*/
	struct i2c_adapter *viafb_find_i2c_adapter(enum viafb_i2c_adap which)
	{
	struct via_i2c_stuff *stuff = &via_i2c_par[which];

	return &stuff->adapter;
	}
	EXPORT_SYMBOL_GPL(viafb_find_i2c_adapter);


	static int create_i2c_bus(struct i2c_adapter *adapter,
	struct i2c_algo_bit_data *algo,
	struct via_port_cfg *adap_cfg,
	struct pci_dev *pdev)
	{
	algo->setsda = via_i2c_setsda;
	algo->setscl = via_i2c_setscl;
	algo->getsda = via_i2c_getsda;
	algo->getscl = via_i2c_getscl;
	algo->udelay = 10;
	algo->timeout = 2;
	algo->data = adap_cfg;

	sprintf(adapter->name, "viafb i2c io_port idx 0x%02x",
	adap_cfg->ioport_index);
	adapter->owner = THIS_MODULE;
	adapter->id = 0x01FFFF;
	adapter->class = I2C_CLASS_DDC;
	adapter->algo_data = algo;
	if (pdev)
	adapter->dev.parent = &pdev->dev;
	else
	adapter->dev.parent = NULL;
	/* i2c_set_adapdata(adapter, adap_cfg); */

	/* Raise SCL and SDA */
	via_i2c_setsda(adap_cfg, 1);
	via_i2c_setscl(adap_cfg, 1);
	udelay(20);

	return i2c_bit_add_bus(adapter);
	}

	static int viafb_i2c_probe(struct platform_device *platdev)
	{
	int i, ret;
	struct via_port_cfg *configs;

	i2c_vdev = platdev->dev.platform_data;
	configs = i2c_vdev->port_cfg;

	for (i = 0; i < VIAFB_NUM_PORTS; i++) {
	struct via_port_cfg *adap_cfg = configs++;
	struct via_i2c_stuff *i2c_stuff = &via_i2c_par[i];

	i2c_stuff->is_active = 0;
	if (adap_cfg->type == 0 \|\| adap_cfg->mode != VIA_MODE_I2C)
	continue;
	ret = create_i2c_bus(&i2c_stuff->adapter,
	&i2c_stuff->algo, adap_cfg,
	NULL); /* FIXME: PCIDEV */
	if (ret < 0) {
	printk(KERN_ERR "viafb: cannot create i2c bus %u:%d\n",
	i, ret);
	continue; /* Still try to make the rest */
	}
	i2c_stuff->is_active = 1;
	}

	return 0;
	}

	static int viafb_i2c_remove(struct platform_device *platdev)
	{
	int i;

	for (i = 0; i < VIAFB_NUM_PORTS; i++) {
	struct via_i2c_stuff *i2c_stuff = &via_i2c_par[i];
	/*
	* Only remove those entries in the array that we've
	* actually used (and thus initialized algo_data)
	*/
	if (i2c_stuff->is_active)
	i2c_del_adapter(&i2c_stuff->adapter);
	}
	return 0;
	}

	static struct platform_driver via_i2c_driver = {
	.driver = {
	.name = "viafb-i2c",
	},
	.probe = viafb_i2c_probe,
	.remove = viafb_i2c_remove,
	};

	int viafb_i2c_init(void)
	{
	return platform_driver_register(&via_i2c_driver);
	}

	void viafb_i2c_exit(void)
	{
	platform_driver_unregister(&via_i2c_driver);
	}