[PATCH 2.5.xx] - i2c-prosavage driver
henk
henk at god.dyndns.org
Wed Jun 18 00:44:47 CEST 2003
OK ;)
On Sat, 14 Jun 2003, Greg KH wrote:
> Care to make a 2.5 patch too?
>
> thanks,
>
> greg k-h
>
--
-------------- next part --------------
diff -ruN --exclude='\.*' linux-2.5.71/drivers/i2c/Kconfig linux-2.5.71-p1/drivers/i2c/Kconfig
--- linux-2.5.71/drivers/i2c/Kconfig 2003-06-14 21:18:01.000000000 +0200
+++ linux-2.5.71-p1/drivers/i2c/Kconfig 2003-06-16 02:01:49.000000000 +0200
@@ -42,6 +42,26 @@
<file:Documentation/modules.txt>.
The module will be called i2c-algo-bit.
+config I2C_PROSAVAGE
+ tristate "S3/VIA (Pro)Savage"
+ depends on I2C_ALGOBIT && PCI && EXPERIMENTAL
+ help
+ If you say yes to this option, support will be included for the
+ I2C bus and DDC bus of the S3VIA embedded Savage4 and ProSavage8
+ graphics processors.
+ chipsets supported:
+ S3/VIA KM266/VT8375 aka ProSavage8
+ S3/VIA KM133/VT8365 aka Savage4
+
+ This can also be built as a module which can be inserted and removed
+ while the kernel is running. If you want to compile it as a module,
+ say M here and read <file:Documentation/modules.txt>.
+ The module will be called i2c-prosavage.
+
+ You will also need the latest user-space utilties: you can find them
+ in the lm_sensors package, which you can download at
+ http://www.lm-sensors.nu
+
config I2C_PHILIPSPAR
tristate "Philips style parallel port adapter"
depends on I2C_ALGOBIT && PARPORT
diff -ruN --exclude='\.*' linux-2.5.71/drivers/i2c/Makefile linux-2.5.71-p1/drivers/i2c/Makefile
--- linux-2.5.71/drivers/i2c/Makefile 2003-06-14 21:17:56.000000000 +0200
+++ linux-2.5.71-p1/drivers/i2c/Makefile 2003-06-16 01:57:44.000000000 +0200
@@ -5,6 +5,7 @@
obj-$(CONFIG_I2C) += i2c-core.o
obj-$(CONFIG_I2C_CHARDEV) += i2c-dev.o
obj-$(CONFIG_I2C_ALGOBIT) += i2c-algo-bit.o
+obj-$(CONFIG_I2C_PROSAVAGE) += i2c-prosavage.o
obj-$(CONFIG_I2C_PHILIPSPAR) += i2c-philips-par.o
obj-$(CONFIG_I2C_ELV) += i2c-elv.o
obj-$(CONFIG_I2C_VELLEMAN) += i2c-velleman.o
diff -ruN --exclude='\.*' linux-2.5.71/drivers/i2c/i2c-prosavage.c linux-2.5.71-p1/drivers/i2c/i2c-prosavage.c
--- linux-2.5.71/drivers/i2c/i2c-prosavage.c 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.5.71-p1/drivers/i2c/i2c-prosavage.c 2003-06-17 23:12:39.000000000 +0200
@@ -0,0 +1,329 @@
+/*
+ * kernel/busses/i2c-prosavage.c
+ *
+ * i2c bus driver for S3/VIA 8365/8375 graphics processor.
+ * Copyright (c) 2003 Henk Vergonet <henk at god.dyndns.org>
+ * Based on code written by:
+ * Frodo Looijaard <frodol at dds.nl>,
+ * Philip Edelbrock <phil at netroedge.com>,
+ * Ralph Metzler <rjkm at thp.uni-koeln.de>, and
+ * Mark D. Studebaker <mdsxyz123 at yahoo.com>
+ * Simon Vogl
+ * and others
+ *
+ * Please read the lm_sensors documentation for details on use.
+ *
+ * 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.
+ *
+ */
+/* 18-05-2003 HVE - created
+ * 14-06-2003 HVE - adapted for lm_sensors2
+ * 17-06-2003 HVE - linux 2.5.xx compatible
+ *
+ * This driver interfaces to the I2C bus of the VIA north bridge embedded
+ * ProSavage4/8 devices. Usefull for gaining access to the TV Encoder chips.
+ *
+ * Graphics cores:
+ * S3/VIA KM266/VT8375 aka ProSavage8
+ * S3/VIA KM133/VT8365 aka Savage4
+ *
+ * Two serial busses are implemented:
+ * SERIAL1 - I2C serial communications interface
+ * SERIAL2 - DDC2 monitor communications interface
+ *
+ * Tested on a FX41 mainboard, see http://www.shuttle.com
+ *
+ *
+ * TODO:
+ * - Robust initialisation code of video registers.
+ * Get rid of the hardcoded video IO base addresses.
+ * (Additional documentation needed :(
+ */
+
+#include <linux/version.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <linux/i2c.h>
+#include <linux/i2c-algo-bit.h>
+
+#include <asm/io.h>
+
+
+/*
+ * driver configuration
+ */
+#define DRIVER_ID "i2c-prosavage"
+#define DRIVER_VERSION "20030617"
+
+
+/*
+ * i2c configuration
+ */
+#ifndef I2C_HW_B_S3VIA
+#define I2C_HW_B_S3VIA 0x18 /* S3VIA ProSavage adapter */
+#endif
+
+/* delays */
+#define CYCLE_DELAY 10
+#define TIMEOUT (HZ / 2)
+
+
+/*
+ * S3/VIA 8365/8375 registers
+ */
+#ifndef PCI_VENDOR_ID_S3
+#define PCI_VENDOR_ID_S3 0x5333
+#endif
+#ifndef PCI_DEVICE_ID_S3_SAVAGE4
+#define PCI_DEVICE_ID_S3_SAVAGE4 0x8a25
+#endif
+#ifndef PCI_DEVICE_ID_S3_PROSAVAGE8
+#define PCI_DEVICE_ID_S3_PROSAVAGE8 0x8d04
+#endif
+
+/* FIXME determine from chip config or use mmio */
+#define VGA_IOBASE0 0x3c0
+#define VGA_IOBASE1 0x3d0
+
+#define PCIREG_SUBSYS 0x2c
+#define IOREG_SUBSYS 0x81
+
+#define IOREG_SERIAL1 0xa0 /* I2C serial communications interface */
+#define MMREG_SERIAL1 0xff20
+#define IOREG_SERIAL2 0xb1 /* DDC2 monitor communications interface */
+
+/* based on vt8365 documentation */
+#define I2C_ENAB 0x00000010
+#define I2C_SCL_OUT 0x00000001
+#define I2C_SDA_OUT 0x00000002
+#define I2C_SCL_IN 0x00000004
+#define I2C_SDA_IN 0x00000008
+
+
+/*
+ * Manipulate the extended video registers
+ *
+ * TODO: spinlocks with other code sections accessing video registers?
+ */
+static inline unsigned int getCR0(unsigned int cr)
+{
+ outb_p((unsigned char)cr, VGA_IOBASE0 + 4);
+ return inb_p(VGA_IOBASE0 + 5);
+}
+
+static inline void setCR0(unsigned int cr, unsigned int val)
+{
+ outb_p((unsigned char)cr, VGA_IOBASE0 + 4);
+ outb_p((unsigned char)val, VGA_IOBASE0 + 5);
+}
+
+static inline unsigned int getCR1(unsigned int cr)
+{
+ outb_p((unsigned char)cr, VGA_IOBASE1 + 4);
+ return inb_p(VGA_IOBASE1 + 5);
+}
+
+static inline void setCR1(unsigned int cr, unsigned int val)
+{
+ outb_p((unsigned char)cr, VGA_IOBASE1 + 4);
+ outb_p((unsigned char)val, VGA_IOBASE1 + 5);
+}
+
+
+/*
+ * Serial bus line handling
+ *
+ * serial communications register as parameter in private data
+ */
+static void bit_s3via_setscl(void *cr, int val)
+{
+ unsigned int r;
+ r = getCR1((unsigned int)cr);
+ r |= I2C_ENAB;
+ if(val) r |= I2C_SCL_OUT;
+ else r &= ~I2C_SCL_OUT;
+ setCR1((unsigned int)cr, r);
+}
+
+static void bit_s3via_setsda(void *cr, int val)
+{
+ unsigned int r;
+ r = getCR1((unsigned int)cr);
+ r |= I2C_ENAB; /* Enable DDC */
+ if(val) r |= I2C_SDA_OUT;
+ else r &= ~I2C_SDA_OUT;
+ setCR1((unsigned int)cr, r);
+}
+
+static int bit_s3via_getscl(void *cr)
+{
+ return (0 != (getCR1((unsigned int)cr) & I2C_SCL_IN));
+}
+
+static int bit_s3via_getsda(void *cr)
+{
+ return (0 != (getCR1((unsigned int)cr) & I2C_SDA_IN));
+}
+
+
+#define MAX_BUSSES 2
+
+static int i2c_bus_cnt = 0;
+static struct s_i2c_bus {
+ struct i2c_adapter adap;
+ struct i2c_algo_bit_data algo;
+} i2c_bus[MAX_BUSSES];
+
+/*
+ * adapter initialisation
+ */
+static int i2c_register_bus(struct pci_dev *dev, unsigned reg)
+{
+ struct s_i2c_bus *p;
+ int ret;
+
+ if(i2c_bus_cnt > MAX_BUSSES) return -ENOSPC;
+
+ p = &i2c_bus[i2c_bus_cnt];
+ p->adap.owner = THIS_MODULE;
+ p->adap.id = I2C_HW_B_S3VIA;
+ p->adap.algo_data = &p->algo;
+ p->algo.setsda = bit_s3via_setsda;
+ p->algo.setscl = bit_s3via_setscl;
+ p->algo.getsda = bit_s3via_getsda;
+ p->algo.getscl = bit_s3via_getscl;
+ p->algo.udelay = CYCLE_DELAY;
+ p->algo.mdelay = CYCLE_DELAY;
+ p->algo.timeout = TIMEOUT;
+ p->algo.data = (void *)reg;
+
+ /* add a xref to the bus number */
+ switch(reg) {
+ case IOREG_SERIAL1:
+ snprintf(p->adap.dev.name, sizeof(p->adap.dev.name),
+ "ProSavage I2C bus at %02x:%02x.%x", dev->bus->number,
+ PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
+ break;
+ case IOREG_SERIAL2:
+ snprintf(p->adap.dev.name, sizeof(p->adap.dev.name),
+ "ProSavage DDC bus at %02x:%02x.%x", dev->bus->number,
+ PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
+ break;
+ default:
+ return -ENODEV;
+ }
+
+ ret = i2c_bit_add_bus(&p->adap);
+ if(ret) return ret;
+
+ i2c_bus_cnt++;
+ return 0;
+}
+
+
+/*
+ * Detect chip and initialize it
+ */
+static int __devinit prosavage_probe(struct pci_dev *dev, const struct pci_device_id *id)
+{
+ int i, ret;
+ u8 tmp;
+
+ /*
+ * Compare subsystem ID's of pci space and video register space.
+ * This could be usefull if more than 1 video device is installed. If
+ * the video io registers are redirected to an other video card we
+ * assume the subsystem ID's do not match and we should abort the
+ * installation.
+ */
+ for(i=0; i<4; i++) {
+ pci_read_config_byte(dev, PCIREG_SUBSYS + i, &tmp);
+ if(tmp != (u8)getCR1(IOREG_SUBSYS + i)) {
+ printk(DRIVER_ID ": Video IO registers redirected?\n");
+ return -ENODEV;
+ }
+ }
+
+ /*
+ * Chip initialisation
+ */
+ /* Unlock Extended IO Space ??? */
+
+ ret = i2c_register_bus(dev, IOREG_SERIAL1);
+ if(ret) return ret;
+
+ ret = i2c_register_bus(dev, IOREG_SERIAL2);
+ return ret;
+}
+
+static void __devexit prosavage_remove(struct pci_dev *dev)
+{
+ int ret;
+ while(i2c_bus_cnt > 0) {
+ i2c_bus_cnt--;
+ ret = i2c_bit_del_bus(&i2c_bus[i2c_bus_cnt].adap);
+ if(ret)
+ printk(DRIVER_ID ": %s not removed\n",
+ i2c_bus[i2c_bus_cnt].adap.dev.name);
+ }
+}
+
+
+/*
+ * Data for PCI driver interface
+ */
+static struct pci_device_id prosavage_pci_tbl[] __devinitdata = {
+ {
+ .vendor = PCI_VENDOR_ID_S3,
+ .device = PCI_DEVICE_ID_S3_SAVAGE4,
+ .subvendor = PCI_ANY_ID,
+ .subdevice = PCI_ANY_ID,
+ },{
+ .vendor = PCI_VENDOR_ID_S3,
+ .device = PCI_DEVICE_ID_S3_PROSAVAGE8,
+ .subvendor = PCI_ANY_ID,
+ .subdevice = PCI_ANY_ID,
+ },{ 0, }
+};
+
+static struct pci_driver prosavage_driver = {
+ .name = "s3via-smbus",
+ .id_table = prosavage_pci_tbl,
+ .probe = prosavage_probe,
+ .remove = __devexit_p(prosavage_remove),
+};
+
+static int __init i2c_prosavage_init(void)
+{
+ i2c_bus_cnt = 0;
+ memset(&i2c_bus, 0, sizeof(i2c_bus));
+
+ printk(DRIVER_ID " version %s (%s)\n", I2C_VERSION, DRIVER_VERSION);
+ return pci_module_init(&prosavage_driver);
+}
+
+static void __exit i2c_prosavage_exit(void)
+{
+ pci_unregister_driver(&prosavage_driver);
+}
+
+MODULE_DEVICE_TABLE(pci, prosavage_pci_tbl);
+MODULE_AUTHOR("Henk Vergonet");
+MODULE_DESCRIPTION("ProSavage VIA 8365/8375 smbus driver");
+MODULE_LICENSE("GPL");
+
+module_init (i2c_prosavage_init);
+module_exit (i2c_prosavage_exit);
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