diff options
| -rw-r--r-- | Documentation/i2c/busses/i2c-viapro | 7 | ||||
| -rw-r--r-- | drivers/i2c/busses/i2c-viapro.c | 39 |
2 files changed, 42 insertions, 4 deletions
diff --git a/Documentation/i2c/busses/i2c-viapro b/Documentation/i2c/busses/i2c-viapro index ef0f1e94e726..387cbd4015fc 100644 --- a/Documentation/i2c/busses/i2c-viapro +++ b/Documentation/i2c/busses/i2c-viapro @@ -14,7 +14,8 @@ Authors: Frodo Looijaard <frodol@dds.nl>, Philip Edelbrock <phil@netroedge.com>, Kyösti Mälkki <kmalkki@cc.hut.fi>, - Mark D. Studebaker <mdsxyz123@yahoo.com> + Mark D. Studebaker <mdsxyz123@yahoo.com>, + Jean Delvare <khali@linux-fr.org> Module Parameters ----------------- @@ -43,3 +44,7 @@ Your lspci -n listing must show one of these : If none of these show up, you should look in the BIOS for settings like enable ACPI / SMBus or even USB. + +Except for the oldest chips (VT82C596A/B, VT82C686A and most probably +VT8231), this driver supports I2C block transactions. Such transactions +are mainly useful to read from and write to EEPROMs. diff --git a/drivers/i2c/busses/i2c-viapro.c b/drivers/i2c/busses/i2c-viapro.c index 262755e1ae02..b420e752b1dc 100644 --- a/drivers/i2c/busses/i2c-viapro.c +++ b/drivers/i2c/busses/i2c-viapro.c @@ -4,6 +4,7 @@ Copyright (c) 1998 - 2002 Frodo Looijaard <frodol@dds.nl>, Philip Edelbrock <phil@netroedge.com>, Kyösti Mälkki <kmalkki@cc.hut.fi>, Mark D. Studebaker <mdsxyz123@yahoo.com> + Copyright (C) 2005 Jean Delvare <khali@linux-fr.org> 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 @@ -88,6 +89,7 @@ static unsigned short smb_cf_hstcfg = 0xD2; #define VT596_BYTE_DATA 0x08 #define VT596_WORD_DATA 0x0C #define VT596_BLOCK_DATA 0x14 +#define VT596_I2C_BLOCK_DATA 0x34 /* If force is set to anything different from 0, we forcibly enable the @@ -107,6 +109,9 @@ MODULE_PARM_DESC(force_addr, static struct i2c_adapter vt596_adapter; +#define FEATURE_I2CBLOCK (1<<0) +static unsigned int vt596_features; + /* Another internally used function */ static int vt596_transaction(void) { @@ -225,6 +230,12 @@ static s32 vt596_access(struct i2c_adapter *adap, u16 addr, } size = VT596_WORD_DATA; break; + case I2C_SMBUS_I2C_BLOCK_DATA: + if (!(vt596_features & FEATURE_I2CBLOCK)) + return -1; + if (read_write == I2C_SMBUS_READ) + outb_p(I2C_SMBUS_BLOCK_MAX, SMBHSTDAT0); + /* Fall through */ case I2C_SMBUS_BLOCK_DATA: outb_p(((addr & 0x7f) << 1) | (read_write & 0x01), SMBHSTADD); @@ -240,11 +251,12 @@ static s32 vt596_access(struct i2c_adapter *adap, u16 addr, for (i = 1; i <= len; i++) outb_p(data->block[i], SMBBLKDAT); } - size = VT596_BLOCK_DATA; + size = (size == I2C_SMBUS_I2C_BLOCK_DATA) ? + VT596_I2C_BLOCK_DATA : VT596_BLOCK_DATA; break; } - outb_p((size & 0x1C) + (ENABLE_INT9 & 1), SMBHSTCNT); + outb_p((size & 0x3C) + (ENABLE_INT9 & 1), SMBHSTCNT); if (vt596_transaction()) /* Error in transaction */ return -1; @@ -266,6 +278,7 @@ static s32 vt596_access(struct i2c_adapter *adap, u16 addr, case VT596_WORD_DATA: data->word = inb_p(SMBHSTDAT0) + (inb_p(SMBHSTDAT1) << 8); break; + case VT596_I2C_BLOCK_DATA: case VT596_BLOCK_DATA: data->block[0] = inb_p(SMBHSTDAT0); if (data->block[0] > I2C_SMBUS_BLOCK_MAX) @@ -280,9 +293,13 @@ static s32 vt596_access(struct i2c_adapter *adap, u16 addr, static u32 vt596_func(struct i2c_adapter *adapter) { - return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE | + u32 func = I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE | I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA | I2C_FUNC_SMBUS_BLOCK_DATA; + + if (vt596_features & FEATURE_I2CBLOCK) + func |= I2C_FUNC_SMBUS_I2C_BLOCK; + return func; } static struct i2c_algorithm smbus_algorithm = { @@ -379,6 +396,22 @@ found: dev_dbg(&pdev->dev, "SMBREV = 0x%X\n", temp); dev_dbg(&pdev->dev, "VT596_smba = 0x%X\n", vt596_smba); + switch (pdev->device) { + case PCI_DEVICE_ID_VIA_8237: + case PCI_DEVICE_ID_VIA_8235: + case PCI_DEVICE_ID_VIA_8233A: + case PCI_DEVICE_ID_VIA_8233_0: + vt596_features |= FEATURE_I2CBLOCK; + break; + case PCI_DEVICE_ID_VIA_82C686_4: + /* The VT82C686B (rev 0x40) does support I2C block + transactions, but the VT82C686A (rev 0x30) doesn't */ + if (!pci_read_config_byte(pdev, PCI_REVISION_ID, &temp) + && temp >= 0x40) + vt596_features |= FEATURE_I2CBLOCK; + break; + } + vt596_adapter.dev.parent = &pdev->dev; snprintf(vt596_adapter.name, I2C_NAME_SIZE, "SMBus Via Pro adapter at %04x", vt596_smba); |