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https://github.com/lm-sensors/lm-sensors.git
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Mark D. Studebaker
ec53bfa1fe
programmers' reference guide. This ensures that the input value
is latched in the 815 register. We assume this also applies
to the 810 or at least does no harm. Ticket 419.
Alan Chen <alp_chen@hotmail.com> reports that this fixes the
bug where i2c-algo-bit bit_test=1 fails the test.
We don't have any data that shows there was any problem in
normal operation (non bit_test) or that this fixes anything else.
git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@941 7894878c-1315-0410-8ee3-d5d059ff63e0
345 lines
8.2 KiB
C
345 lines
8.2 KiB
C
/*
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i2c-i810.c - Part of lm_sensors, Linux kernel modules for hardware
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monitoring
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Copyright (c) 1998, 1999, 2000 Frodo Looijaard <frodol@dds.nl>,
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Philip Edelbrock <phil@netroedge.com>,
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Ralph Metzler <rjkm@thp.uni-koeln.de>, and
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Mark D. Studebaker <mdsxyz123@yahoo.com>
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Based on code written by Ralph Metzler <rjkm@thp.uni-koeln.de> and
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Simon Vogl
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/*
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This interfaces to the I810/I815 to provide access to
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the DDC Bus and the I2C Bus.
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SUPPORTED DEVICES PCI ID
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i810AA 7121
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i810AB 7123
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i815 1132
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*/
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#include <linux/version.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <asm/io.h>
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#include <linux/i2c.h>
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#include <linux/i2c-algo-bit.h>
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#include "version.h"
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#include <linux/init.h>
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/* PCI defines */
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#ifndef PCI_DEVICE_ID_INTEL_82810_IG1
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#define PCI_DEVICE_ID_INTEL_82810_IG1 0x7121
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#endif
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#ifndef PCI_DEVICE_ID_INTEL_82810_IG3
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#define PCI_DEVICE_ID_INTEL_82810_IG3 0x7123
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#endif
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#ifndef PCI_DEVICE_ID_INTEL_82815_2
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#define PCI_DEVICE_ID_INTEL_82815_2 0x1132
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#endif
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static int i810_supported[] = {PCI_DEVICE_ID_INTEL_82810_IG1,
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PCI_DEVICE_ID_INTEL_82810_IG3,
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PCI_DEVICE_ID_INTEL_82815_2,
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0 };
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/* GPIO register locations */
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#define I810_IOCONTROL_OFFSET 0x5000
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#define I810_HVSYNC 0x00 /* not used */
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#define I810_GPIOA 0x10
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#define I810_GPIOB 0x14
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/* bit locations in the registers */
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#define SCL_DIR_MASK 0x0001
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#define SCL_DIR 0x0002
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#define SCL_VAL_MASK 0x0004
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#define SCL_VAL_OUT 0x0008
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#define SCL_VAL_IN 0x0010
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#define SDA_DIR_MASK 0x0100
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#define SDA_DIR 0x0200
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#define SDA_VAL_MASK 0x0400
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#define SDA_VAL_OUT 0x0800
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#define SDA_VAL_IN 0x1000
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/* initialization states */
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#define INIT1 0x1
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#define INIT2 0x2
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#define INIT3 0x4
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/* delays */
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#define CYCLE_DELAY 10
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#define TIMEOUT 50
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#ifdef MODULE
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static
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#else
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extern
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#endif
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int __init i2c_i810i2c_init(void);
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static int __init i810i2c_cleanup(void);
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static int i810i2c_setup(void);
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static void config_i810(struct pci_dev *dev);
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static void i810_inc(struct i2c_adapter *adapter);
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static void i810_dec(struct i2c_adapter *adapter);
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#ifdef MODULE
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extern int init_module(void);
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extern int cleanup_module(void);
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#endif /* MODULE */
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static int __initdata i810i2c_initialized;
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static unsigned char *mem;
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static inline void outlong(unsigned int dat, int off)
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{
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*((unsigned int *) (mem + off)) = dat;
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}
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static inline unsigned int readlong(int off)
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{
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return *((unsigned int *) (mem + off));
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}
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/* The i810 GPIO registers have individual masks for each bit
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so we never have to read before writing. Nice. */
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static void bit_i810i2c_setscl(void *data, int val)
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{
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outlong((val ? SCL_VAL_OUT : 0) | SCL_DIR | SCL_DIR_MASK | SCL_VAL_MASK,
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I810_GPIOB);
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}
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static void bit_i810i2c_setsda(void *data, int val)
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{
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outlong((val ? SDA_VAL_OUT : 0) | SDA_DIR | SDA_DIR_MASK | SDA_VAL_MASK,
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I810_GPIOB);
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}
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/* The GPIO pins are open drain, so the pins always remain outputs.
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We rely on the i2c-algo-bit routines to set the pins high before
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reading the input from other chips. Following guidance in the 815
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prog. ref. guide, we do a "dummy write" of 0 to the register before
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reading which forces the input value to be latched. We presume this
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applies to the 810 as well. This is necessary to get
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i2c_algo_bit bit_test=1 to pass. */
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static int bit_i810i2c_getscl(void *data)
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{
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outlong(0, I810_GPIOB);
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return (0 != (readlong(I810_GPIOB) & SCL_VAL_IN));
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}
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static int bit_i810i2c_getsda(void *data)
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{
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outlong(0, I810_GPIOB);
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return (0 != (readlong(I810_GPIOB) & SDA_VAL_IN));
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}
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static void bit_i810ddc_setscl(void *data, int val)
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{
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outlong((val ? SCL_VAL_OUT : 0) | SCL_DIR | SCL_DIR_MASK | SCL_VAL_MASK,
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I810_GPIOA);
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}
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static void bit_i810ddc_setsda(void *data, int val)
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{
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outlong((val ? SDA_VAL_OUT : 0) | SDA_DIR | SDA_DIR_MASK | SDA_VAL_MASK,
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I810_GPIOA);
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}
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static int bit_i810ddc_getscl(void *data)
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{
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outlong(0, I810_GPIOA);
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return (0 != (readlong(I810_GPIOA) & SCL_VAL_IN));
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}
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static int bit_i810ddc_getsda(void *data)
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{
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outlong(0, I810_GPIOA);
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return (0 != (readlong(I810_GPIOA) & SDA_VAL_IN));
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}
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static struct i2c_algo_bit_data i810_i2c_bit_data = {
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NULL,
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bit_i810i2c_setsda,
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bit_i810i2c_setscl,
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bit_i810i2c_getsda,
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bit_i810i2c_getscl,
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CYCLE_DELAY, CYCLE_DELAY, TIMEOUT
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};
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static struct i2c_adapter i810_i2c_adapter = {
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"I810/I815 I2C Adapter",
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I2C_HW_B_I810,
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NULL,
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&i810_i2c_bit_data,
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i810_inc,
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i810_dec,
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NULL,
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NULL,
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};
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static struct i2c_algo_bit_data i810_ddc_bit_data = {
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NULL,
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bit_i810ddc_setsda,
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bit_i810ddc_setscl,
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bit_i810ddc_getsda,
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bit_i810ddc_getscl,
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CYCLE_DELAY, CYCLE_DELAY, TIMEOUT
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};
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static struct i2c_adapter i810_ddc_adapter = {
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"I810/I815 DDC Adapter",
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I2C_HW_B_I810,
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NULL,
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&i810_ddc_bit_data,
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i810_inc,
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i810_dec,
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NULL,
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NULL,
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};
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/* Configures the chip */
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void config_i810(struct pci_dev *dev)
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{
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unsigned long cadr;
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/* map I810 memory */
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,3,13)
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cadr = dev->resource[1].start;
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#else
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cadr = dev->base_address[1];
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#endif
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cadr += I810_IOCONTROL_OFFSET;
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cadr &= PCI_BASE_ADDRESS_MEM_MASK;
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mem = ioremap_nocache(cadr, 0x1000);
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bit_i810i2c_setscl(NULL, 1);
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bit_i810i2c_setsda(NULL, 1);
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bit_i810ddc_setscl(NULL, 1);
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bit_i810ddc_setsda(NULL, 1);
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}
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/* Detect whether a supported device can be found,
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and initialize it */
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static int i810i2c_setup(void)
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{
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struct pci_dev *dev = NULL;
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int *num = i810_supported;
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do {
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if ((dev = pci_find_device(PCI_VENDOR_ID_INTEL,
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*num++, dev))) {
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config_i810(dev);
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printk(KERN_INFO
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"i2c-i810.o: i810/i815 found.\n");
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return 0;
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}
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} while (*num != 0);
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return -ENODEV;
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}
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void i810_inc(struct i2c_adapter *adapter)
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{
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MOD_INC_USE_COUNT;
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}
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void i810_dec(struct i2c_adapter *adapter)
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{
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MOD_DEC_USE_COUNT;
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}
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int __init i2c_i810i2c_init(void)
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{
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int res;
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printk("i2c-i810.o version %s (%s)\n", LM_VERSION, LM_DATE);
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i810i2c_initialized = 0;
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if ((res = i810i2c_setup())) {
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printk
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("i2c-i810.o: i810/i815 not detected, module not inserted.\n");
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i810i2c_cleanup();
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return res;
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}
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if ((res = i2c_bit_add_bus(&i810_i2c_adapter))) {
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printk("i2c-i810.o: I2C adapter registration failed\n");
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} else {
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printk("i2c-i810.o: I810/I815 I2C bus initialized\n");
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i810i2c_initialized |= INIT2;
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}
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if ((res = i2c_bit_add_bus(&i810_ddc_adapter))) {
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printk("i2c-i810.o: DDC adapter registration failed\n");
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} else {
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printk("i2c-i810.o: I810/I815 DDC bus initialized\n");
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i810i2c_initialized |= INIT3;
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}
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if(!(i810i2c_initialized & (INIT2 | INIT3))) {
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printk("i2c-i810.o: Both registrations failed, module not inserted\n");
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i810i2c_cleanup();
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return res;
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}
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return 0;
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}
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int __init i810i2c_cleanup(void)
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{
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int res;
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iounmap(mem);
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if (i810i2c_initialized & INIT3) {
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if ((res = i2c_bit_del_bus(&i810_ddc_adapter))) {
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printk
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("i2c-i810.o: i2c_del_adapter failed, module not removed\n");
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return res;
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}
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}
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if (i810i2c_initialized & INIT2) {
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if ((res = i2c_bit_del_bus(&i810_i2c_adapter))) {
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printk
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("i2c-i810.o: i2c_del_adapter failed, module not removed\n");
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return res;
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}
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}
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i810i2c_initialized = 0;
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return 0;
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}
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EXPORT_NO_SYMBOLS;
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#ifdef MODULE
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MODULE_AUTHOR
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("Frodo Looijaard <frodol@dds.nl>, Philip Edelbrock <phil@netroedge.com>, Ralph Metzler <rjkm@thp.uni-koeln.de>, and Mark D. Studebaker <mdsxyz123@yahoo.com>");
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MODULE_DESCRIPTION("I810/I815 I2C/DDC driver");
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int init_module(void)
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{
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return i2c_i810i2c_init();
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}
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int cleanup_module(void)
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{
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return i810i2c_cleanup();
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}
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#endif /* MODULE */
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