diff options
Diffstat (limited to 'ANDROID_3.4.5/drivers/i2c/busses/i2c-sis96x.c')
| -rw-r--r-- | ANDROID_3.4.5/drivers/i2c/busses/i2c-sis96x.c | 344 |
1 files changed, 0 insertions, 344 deletions
diff --git a/ANDROID_3.4.5/drivers/i2c/busses/i2c-sis96x.c b/ANDROID_3.4.5/drivers/i2c/busses/i2c-sis96x.c deleted file mode 100644 index cc5d1494..00000000 --- a/ANDROID_3.4.5/drivers/i2c/busses/i2c-sis96x.c +++ /dev/null @@ -1,344 +0,0 @@ -/* - Copyright (c) 2003 Mark M. Hoffman <mhoffman@lightlink.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. -*/ - -/* - This module must be considered BETA unless and until - the chipset manufacturer releases a datasheet. - The register definitions are based on the SiS630. - - This module relies on quirk_sis_96x_smbus (drivers/pci/quirks.c) - for just about every machine for which users have reported. - If this module isn't detecting your 96x south bridge, have a - look there. - - We assume there can only be one SiS96x with one SMBus interface. -*/ - -#include <linux/module.h> -#include <linux/pci.h> -#include <linux/kernel.h> -#include <linux/delay.h> -#include <linux/stddef.h> -#include <linux/ioport.h> -#include <linux/i2c.h> -#include <linux/init.h> -#include <linux/acpi.h> -#include <linux/io.h> - -/* base address register in PCI config space */ -#define SIS96x_BAR 0x04 - -/* SiS96x SMBus registers */ -#define SMB_STS 0x00 -#define SMB_EN 0x01 -#define SMB_CNT 0x02 -#define SMB_HOST_CNT 0x03 -#define SMB_ADDR 0x04 -#define SMB_CMD 0x05 -#define SMB_PCOUNT 0x06 -#define SMB_COUNT 0x07 -#define SMB_BYTE 0x08 -#define SMB_DEV_ADDR 0x10 -#define SMB_DB0 0x11 -#define SMB_DB1 0x12 -#define SMB_SAA 0x13 - -/* register count for request_region */ -#define SMB_IOSIZE 0x20 - -/* Other settings */ -#define MAX_TIMEOUT 500 - -/* SiS96x SMBus constants */ -#define SIS96x_QUICK 0x00 -#define SIS96x_BYTE 0x01 -#define SIS96x_BYTE_DATA 0x02 -#define SIS96x_WORD_DATA 0x03 -#define SIS96x_PROC_CALL 0x04 -#define SIS96x_BLOCK_DATA 0x05 - -static struct pci_driver sis96x_driver; -static struct i2c_adapter sis96x_adapter; -static u16 sis96x_smbus_base; - -static inline u8 sis96x_read(u8 reg) -{ - return inb(sis96x_smbus_base + reg) ; -} - -static inline void sis96x_write(u8 reg, u8 data) -{ - outb(data, sis96x_smbus_base + reg) ; -} - -/* Execute a SMBus transaction. - int size is from SIS96x_QUICK to SIS96x_BLOCK_DATA - */ -static int sis96x_transaction(int size) -{ - int temp; - int result = 0; - int timeout = 0; - - dev_dbg(&sis96x_adapter.dev, "SMBus transaction %d\n", size); - - /* Make sure the SMBus host is ready to start transmitting */ - if (((temp = sis96x_read(SMB_CNT)) & 0x03) != 0x00) { - - dev_dbg(&sis96x_adapter.dev, "SMBus busy (0x%02x). " - "Resetting...\n", temp); - - /* kill the transaction */ - sis96x_write(SMB_HOST_CNT, 0x20); - - /* check it again */ - if (((temp = sis96x_read(SMB_CNT)) & 0x03) != 0x00) { - dev_dbg(&sis96x_adapter.dev, "Failed (0x%02x)\n", temp); - return -EBUSY; - } else { - dev_dbg(&sis96x_adapter.dev, "Successful\n"); - } - } - - /* Turn off timeout interrupts, set fast host clock */ - sis96x_write(SMB_CNT, 0x20); - - /* clear all (sticky) status flags */ - temp = sis96x_read(SMB_STS); - sis96x_write(SMB_STS, temp & 0x1e); - - /* start the transaction by setting bit 4 and size bits */ - sis96x_write(SMB_HOST_CNT, 0x10 | (size & 0x07)); - - /* We will always wait for a fraction of a second! */ - do { - msleep(1); - temp = sis96x_read(SMB_STS); - } while (!(temp & 0x0e) && (timeout++ < MAX_TIMEOUT)); - - /* If the SMBus is still busy, we give up */ - if (timeout > MAX_TIMEOUT) { - dev_dbg(&sis96x_adapter.dev, "SMBus Timeout! (0x%02x)\n", temp); - result = -ETIMEDOUT; - } - - /* device error - probably missing ACK */ - if (temp & 0x02) { - dev_dbg(&sis96x_adapter.dev, "Failed bus transaction!\n"); - result = -ENXIO; - } - - /* bus collision */ - if (temp & 0x04) { - dev_dbg(&sis96x_adapter.dev, "Bus collision!\n"); - result = -EIO; - } - - /* Finish up by resetting the bus */ - sis96x_write(SMB_STS, temp); - if ((temp = sis96x_read(SMB_STS))) { - dev_dbg(&sis96x_adapter.dev, "Failed reset at " - "end of transaction! (0x%02x)\n", temp); - } - - return result; -} - -/* Return negative errno on error. */ -static s32 sis96x_access(struct i2c_adapter * adap, u16 addr, - unsigned short flags, char read_write, - u8 command, int size, union i2c_smbus_data * data) -{ - int status; - - switch (size) { - case I2C_SMBUS_QUICK: - sis96x_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01)); - size = SIS96x_QUICK; - break; - - case I2C_SMBUS_BYTE: - sis96x_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01)); - if (read_write == I2C_SMBUS_WRITE) - sis96x_write(SMB_CMD, command); - size = SIS96x_BYTE; - break; - - case I2C_SMBUS_BYTE_DATA: - sis96x_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01)); - sis96x_write(SMB_CMD, command); - if (read_write == I2C_SMBUS_WRITE) - sis96x_write(SMB_BYTE, data->byte); - size = SIS96x_BYTE_DATA; - break; - - case I2C_SMBUS_PROC_CALL: - case I2C_SMBUS_WORD_DATA: - sis96x_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01)); - sis96x_write(SMB_CMD, command); - if (read_write == I2C_SMBUS_WRITE) { - sis96x_write(SMB_BYTE, data->word & 0xff); - sis96x_write(SMB_BYTE + 1, (data->word & 0xff00) >> 8); - } - size = (size == I2C_SMBUS_PROC_CALL ? - SIS96x_PROC_CALL : SIS96x_WORD_DATA); - break; - - default: - dev_warn(&adap->dev, "Unsupported transaction %d\n", size); - return -EOPNOTSUPP; - } - - status = sis96x_transaction(size); - if (status) - return status; - - if ((size != SIS96x_PROC_CALL) && - ((read_write == I2C_SMBUS_WRITE) || (size == SIS96x_QUICK))) - return 0; - - switch (size) { - case SIS96x_BYTE: - case SIS96x_BYTE_DATA: - data->byte = sis96x_read(SMB_BYTE); - break; - - case SIS96x_WORD_DATA: - case SIS96x_PROC_CALL: - data->word = sis96x_read(SMB_BYTE) + - (sis96x_read(SMB_BYTE + 1) << 8); - break; - } - return 0; -} - -static u32 sis96x_func(struct i2c_adapter *adapter) -{ - return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE | - I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA | - I2C_FUNC_SMBUS_PROC_CALL; -} - -static const struct i2c_algorithm smbus_algorithm = { - .smbus_xfer = sis96x_access, - .functionality = sis96x_func, -}; - -static struct i2c_adapter sis96x_adapter = { - .owner = THIS_MODULE, - .class = I2C_CLASS_HWMON | I2C_CLASS_SPD, - .algo = &smbus_algorithm, -}; - -static DEFINE_PCI_DEVICE_TABLE(sis96x_ids) = { - { PCI_DEVICE(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_SMBUS) }, - { 0, } -}; - -MODULE_DEVICE_TABLE (pci, sis96x_ids); - -static int __devinit sis96x_probe(struct pci_dev *dev, - const struct pci_device_id *id) -{ - u16 ww = 0; - int retval; - - if (sis96x_smbus_base) { - dev_err(&dev->dev, "Only one device supported.\n"); - return -EBUSY; - } - - pci_read_config_word(dev, PCI_CLASS_DEVICE, &ww); - if (PCI_CLASS_SERIAL_SMBUS != ww) { - dev_err(&dev->dev, "Unsupported device class 0x%04x!\n", ww); - return -ENODEV; - } - - sis96x_smbus_base = pci_resource_start(dev, SIS96x_BAR); - if (!sis96x_smbus_base) { - dev_err(&dev->dev, "SiS96x SMBus base address " - "not initialized!\n"); - return -EINVAL; - } - dev_info(&dev->dev, "SiS96x SMBus base address: 0x%04x\n", - sis96x_smbus_base); - - retval = acpi_check_resource_conflict(&dev->resource[SIS96x_BAR]); - if (retval) - return -ENODEV; - - /* Everything is happy, let's grab the memory and set things up. */ - if (!request_region(sis96x_smbus_base, SMB_IOSIZE, - sis96x_driver.name)) { - dev_err(&dev->dev, "SMBus registers 0x%04x-0x%04x " - "already in use!\n", sis96x_smbus_base, - sis96x_smbus_base + SMB_IOSIZE - 1); - - sis96x_smbus_base = 0; - return -EINVAL; - } - - /* set up the sysfs linkage to our parent device */ - sis96x_adapter.dev.parent = &dev->dev; - - snprintf(sis96x_adapter.name, sizeof(sis96x_adapter.name), - "SiS96x SMBus adapter at 0x%04x", sis96x_smbus_base); - - if ((retval = i2c_add_adapter(&sis96x_adapter))) { - dev_err(&dev->dev, "Couldn't register adapter!\n"); - release_region(sis96x_smbus_base, SMB_IOSIZE); - sis96x_smbus_base = 0; - } - - return retval; -} - -static void __devexit sis96x_remove(struct pci_dev *dev) -{ - if (sis96x_smbus_base) { - i2c_del_adapter(&sis96x_adapter); - release_region(sis96x_smbus_base, SMB_IOSIZE); - sis96x_smbus_base = 0; - } -} - -static struct pci_driver sis96x_driver = { - .name = "sis96x_smbus", - .id_table = sis96x_ids, - .probe = sis96x_probe, - .remove = __devexit_p(sis96x_remove), -}; - -static int __init i2c_sis96x_init(void) -{ - return pci_register_driver(&sis96x_driver); -} - -static void __exit i2c_sis96x_exit(void) -{ - pci_unregister_driver(&sis96x_driver); -} - -MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>"); -MODULE_DESCRIPTION("SiS96x SMBus driver"); -MODULE_LICENSE("GPL"); - -/* Register initialization functions using helper macros */ -module_init(i2c_sis96x_init); -module_exit(i2c_sis96x_exit); - |