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Commit ad04d5c3 authored by Hans-Frieder Vogt's avatar Hans-Frieder Vogt Committed by Jean Delvare
Browse files

i2c: Cleanups to the i2c-nforce2 bus driver 



Summary of changes:

- fixes:
   o legacy I/O region size is 64 bytes, not 8 bytes
- general cleanup:
   o removed code for the unsupported I2C block data, block data,
      proc call and block proc call transfer modes
   o removed detail warnings about unsupported modes that are
     covered in a general warning (unsupported transaction...)
     anyway
   o removed necessity of a definition of struct i2c_adapter
   o moved definition of struct i2c_algorithm, making forward
     declarations of nforce2_access and nforce2_func unnecessary
- minor changes:
   o in the description mention the nForce 5xx chipsets
   o changes my e-mail address in MODULE_AUTHOR

Theses cleanups shrink the driver binary size from 4.0 kB to 2.7 kB
on i386.

Signed-off-by: default avatarHans-Frieder Vogt <hfvogt@gmx.net>
Signed-off-by: default avatarJean Delvare <khali@linux-fr.org>
parent 31c095b0

Documentation/i2c/busses/i2c-nforce2

+1 −1
Original line number Diff line number Diff line
@@ -14,7 +14,7 @@ Datasheet: not publicly available, but seems to be similar to the 
           AMD-8111 SMBus 2.0 adapter.



Authors:

	Hans-Frieder Vogt <hfvogt@arcor.de>, 

	Hans-Frieder Vogt <hfvogt@gmx.net>,

	Thomas Leibold <thomas@plx.com>, 

        Patrick Dreker <patrick@dreker.de>

drivers/i2c/busses/i2c-nforce2.c

+14 −75
Original line number Diff line number Diff line
@@ -35,7 +35,7 @@ 
    nForce4 MCP55		0368



    This driver supports the 2 SMBuses that are included in the MCP of the

    nForce2/3/4 chipsets.

    nForce2/3/4/5xx chipsets.

*/



/* Note: we assume there can only be one nForce2, with two SMBus interfaces */
@@ -52,8 +52,8 @@ 
#include <asm/io.h>



MODULE_LICENSE("GPL");

MODULE_AUTHOR ("Hans-Frieder Vogt <hfvogt@arcor.de>");

MODULE_DESCRIPTION("nForce2 SMBus driver");

MODULE_AUTHOR ("Hans-Frieder Vogt <hfvogt@gmx.net>");

MODULE_DESCRIPTION("nForce2/3/4/5xx SMBus driver");





struct nforce2_smbus {
@@ -80,9 +80,6 @@ struct nforce2_smbus { 
#define NVIDIA_SMB_ADDR		(smbus->base + 0x02)	/* address */

#define NVIDIA_SMB_CMD		(smbus->base + 0x03)	/* command */

#define NVIDIA_SMB_DATA		(smbus->base + 0x04)	/* 32 data registers */

#define NVIDIA_SMB_BCNT		(smbus->base + 0x24)	/* number of data bytes */

#define NVIDIA_SMB_ALRM_A	(smbus->base + 0x25)	/* alarm address */

#define NVIDIA_SMB_ALRM_D	(smbus->base + 0x26)	/* 2 bytes alarm data */



#define NVIDIA_SMB_STS_DONE	0x80

#define NVIDIA_SMB_STS_ALRM	0x40
@@ -95,40 +92,17 @@ struct nforce2_smbus { 
#define NVIDIA_SMB_PRTCL_BYTE			0x04

#define NVIDIA_SMB_PRTCL_BYTE_DATA		0x06

#define NVIDIA_SMB_PRTCL_WORD_DATA		0x08

#define NVIDIA_SMB_PRTCL_BLOCK_DATA		0x0a

#define NVIDIA_SMB_PRTCL_PROC_CALL		0x0c

#define NVIDIA_SMB_PRTCL_BLOCK_PROC_CALL	0x0d

#define NVIDIA_SMB_PRTCL_I2C_BLOCK_DATA		0x4a

#define NVIDIA_SMB_PRTCL_PEC			0x80



static struct pci_driver nforce2_driver;



static s32 nforce2_access(struct i2c_adapter *adap, u16 addr,

		       unsigned short flags, char read_write,

		       u8 command, int size, union i2c_smbus_data *data);

static u32 nforce2_func(struct i2c_adapter *adapter);





static const struct i2c_algorithm smbus_algorithm = {

	.smbus_xfer = nforce2_access,

	.functionality = nforce2_func,

};



static struct i2c_adapter nforce2_adapter = {

	.owner          = THIS_MODULE,

	.class          = I2C_CLASS_HWMON,

	.algo           = &smbus_algorithm,

};



/* Return -1 on error. See smbus.h for more information */

/* Return -1 on error */

static s32 nforce2_access(struct i2c_adapter * adap, u16 addr,

		unsigned short flags, char read_write,

		u8 command, int size, union i2c_smbus_data * data)

{

	struct nforce2_smbus *smbus = adap->algo_data;

	unsigned char protocol, pec, temp;

	unsigned char len = 0; /* to keep the compiler quiet */

	int i;



	protocol = (read_write == I2C_SMBUS_READ) ? NVIDIA_SMB_PRTCL_READ :

		NVIDIA_SMB_PRTCL_WRITE;
@@ -163,35 +137,6 @@ static s32 nforce2_access(struct i2c_adapter * adap, u16 addr, 
			protocol |= NVIDIA_SMB_PRTCL_WORD_DATA | pec;

			break;



		case I2C_SMBUS_BLOCK_DATA:

			outb_p(command, NVIDIA_SMB_CMD);

			if (read_write == I2C_SMBUS_WRITE) {

				len = min_t(u8, data->block[0], 32);

				outb_p(len, NVIDIA_SMB_BCNT);

				for (i = 0; i < len; i++)

					outb_p(data->block[i + 1], NVIDIA_SMB_DATA+i);

			}

			protocol |= NVIDIA_SMB_PRTCL_BLOCK_DATA | pec;

			break;



		case I2C_SMBUS_I2C_BLOCK_DATA:

			len = min_t(u8, data->block[0], 32);

			outb_p(command, NVIDIA_SMB_CMD);

			outb_p(len, NVIDIA_SMB_BCNT);

			if (read_write == I2C_SMBUS_WRITE)

				for (i = 0; i < len; i++)

					outb_p(data->block[i + 1], NVIDIA_SMB_DATA+i);

			protocol |= NVIDIA_SMB_PRTCL_I2C_BLOCK_DATA;

			break;



		case I2C_SMBUS_PROC_CALL:

			dev_err(&adap->dev, "I2C_SMBUS_PROC_CALL not supported!\n");

			return -1;



		case I2C_SMBUS_BLOCK_PROC_CALL:

			dev_err(&adap->dev, "I2C_SMBUS_BLOCK_PROC_CALL not supported!\n");

			return -1;



		default:

			dev_err(&adap->dev, "Unsupported transaction %d\n", size);

			return -1;
@@ -227,19 +172,8 @@ static s32 nforce2_access(struct i2c_adapter * adap, u16 addr, 
			break;



		case I2C_SMBUS_WORD_DATA:

		/* case I2C_SMBUS_PROC_CALL: not supported */

			data->word = inb_p(NVIDIA_SMB_DATA) | (inb_p(NVIDIA_SMB_DATA+1) << 8);

			break;



		case I2C_SMBUS_BLOCK_DATA:

		/* case I2C_SMBUS_BLOCK_PROC_CALL: not supported */

			len = inb_p(NVIDIA_SMB_BCNT);

			len = min_t(u8, len, 32);

		case I2C_SMBUS_I2C_BLOCK_DATA:

			for (i = 0; i < len; i++)

				data->block[i+1] = inb_p(NVIDIA_SMB_DATA + i);

			data->block[0] = len;

			break;

	}



	return 0;
@@ -250,10 +184,14 @@ static u32 nforce2_func(struct i2c_adapter *adapter) 
{

	/* other functionality might be possible, but is not tested */

	return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |

	    I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA /* |

	    I2C_FUNC_SMBUS_BLOCK_DATA */;

	    I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA;

}



static struct i2c_algorithm smbus_algorithm = {

	.smbus_xfer	= nforce2_access,

	.functionality	= nforce2_func,

};





static struct pci_device_id nforce2_ids[] = {

	{ PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2_SMBUS) },
@@ -267,7 +205,6 @@ static struct pci_device_id nforce2_ids[] = { 
	{ 0 }

};





MODULE_DEVICE_TABLE (pci, nforce2_ids);
@@ -291,7 +228,7 @@ static int __devinit nforce2_probe_smb (struct pci_dev *dev, int bar, 
		}



		smbus->base = iobase & PCI_BASE_ADDRESS_IO_MASK;

		smbus->size = 8;

		smbus->size = 64;

	}

	smbus->dev = dev;
@@ -300,7 +237,9 @@ static int __devinit nforce2_probe_smb (struct pci_dev *dev, int bar, 
			smbus->base, smbus->base+smbus->size-1, name);

		return -1;

	}

	smbus->adapter = nforce2_adapter;

	smbus->adapter.owner = THIS_MODULE;

	smbus->adapter.class = I2C_CLASS_HWMON;

	smbus->adapter.algo = &smbus_algorithm;

	smbus->adapter.algo_data = smbus;

	smbus->adapter.dev.parent = &dev->dev;

	snprintf(smbus->adapter.name, I2C_NAME_SIZE,