[deliverable/linux.git] / drivers / i2c / busses / i2c-via.c

/*
    i2c-via.c - Part of lm_sensors,  Linux kernel modules
                for hardware monitoring

    i2c Support for Via Technologies 82C586B South Bridge

    Copyright (c) 1998, 1999 Kyösti Mälkki <kmalkki@cc.hut.fi>

    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.
*/

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/i2c-algo-bit.h>
#include <asm/io.h>

/* Power management registers */
#define PM_CFG_REVID	0x08	/* silicon revision code */
#define PM_CFG_IOBASE0	0x20
#define PM_CFG_IOBASE1	0x48

#define I2C_DIR		(pm_io_base+0x40)
#define I2C_OUT		(pm_io_base+0x42)
#define I2C_IN		(pm_io_base+0x44)
#define I2C_SCL		0x02	/* clock bit in DIR/OUT/IN register */
#define I2C_SDA		0x04

/* io-region reservation */
#define IOSPACE		0x06

static struct pci_driver vt586b_driver;
static u16 pm_io_base;

/*
   It does not appear from the datasheet that the GPIO pins are
   open drain. So a we set a low value by setting the direction to
   output and a high value by setting the direction to input and
   relying on the required I2C pullup. The data value is initialized
   to 0 in via_init() and never changed.
*/
static void bit_via_setscl(void *data, int state)
{
	outb(state ? inb(I2C_DIR) & ~I2C_SCL : inb(I2C_DIR) | I2C_SCL, I2C_DIR);
}

static void bit_via_setsda(void *data, int state)
{
	outb(state ? inb(I2C_DIR) & ~I2C_SDA : inb(I2C_DIR) | I2C_SDA, I2C_DIR);
}

static int bit_via_getscl(void *data)
{
	return (0 != (inb(I2C_IN) & I2C_SCL));
}

static int bit_via_getsda(void *data)
{
	return (0 != (inb(I2C_IN) & I2C_SDA));
}


static struct i2c_algo_bit_data bit_data = {
	.setsda		= bit_via_setsda,
	.setscl		= bit_via_setscl,
	.getsda		= bit_via_getsda,
	.getscl		= bit_via_getscl,
	.udelay		= 5,
	.timeout	= HZ
};

static struct i2c_adapter vt586b_adapter = {
	.owner		= THIS_MODULE,
	.id		= I2C_HW_B_VIA,
	.class          = I2C_CLASS_HWMON,
	.name		= "VIA i2c",
	.algo_data	= &bit_data,
};


static struct pci_device_id vt586b_ids[] __devinitdata = {
	{ PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C586_3) },
	{ 0, }
};

MODULE_DEVICE_TABLE (pci, vt586b_ids);

static int __devinit vt586b_probe(struct pci_dev *dev, const struct pci_device_id *id)
{
	u16 base;
	u8 rev;
	int res;

	if (pm_io_base) {
		dev_err(&dev->dev, "i2c-via: Will only support one host\n");
		return -ENODEV;
	}

	pci_read_config_byte(dev, PM_CFG_REVID, &rev);

	switch (rev) {
	case 0x00:
		base = PM_CFG_IOBASE0;
		break;
	case 0x01:
	case 0x10:
		base = PM_CFG_IOBASE1;
		break;

	default:
		base = PM_CFG_IOBASE1;
		/* later revision */
	}

	pci_read_config_word(dev, base, &pm_io_base);
	pm_io_base &= (0xff << 8);

	if (!request_region(I2C_DIR, IOSPACE, vt586b_driver.name)) {
		dev_err(&dev->dev, "IO 0x%x-0x%x already in use\n", I2C_DIR, I2C_DIR + IOSPACE);
		return -ENODEV;
	}

	outb(inb(I2C_DIR) & ~(I2C_SDA | I2C_SCL), I2C_DIR);
	outb(inb(I2C_OUT) & ~(I2C_SDA | I2C_SCL), I2C_OUT);

	/* set up the sysfs linkage to our parent device */
	vt586b_adapter.dev.parent = &dev->dev;

	res = i2c_bit_add_bus(&vt586b_adapter);
	if ( res < 0 ) {
		release_region(I2C_DIR, IOSPACE);
		pm_io_base = 0;
		return res;
	}
	return 0;
}

static void __devexit vt586b_remove(struct pci_dev *dev)
{
	i2c_del_adapter(&vt586b_adapter);
	release_region(I2C_DIR, IOSPACE);
	pm_io_base = 0;
}


static struct pci_driver vt586b_driver = {
	.name		= "vt586b_smbus",
	.id_table	= vt586b_ids,
	.probe		= vt586b_probe,
	.remove		= __devexit_p(vt586b_remove),
};

static int __init i2c_vt586b_init(void)
{
	return pci_register_driver(&vt586b_driver);
}

static void __exit i2c_vt586b_exit(void)
{
	pci_unregister_driver(&vt586b_driver);
}


MODULE_AUTHOR("Kyösti Mälkki <kmalkki@cc.hut.fi>");
MODULE_DESCRIPTION("i2c for Via vt82c586b southbridge");
MODULE_LICENSE("GPL");

module_init(i2c_vt586b_init);
module_exit(i2c_vt586b_exit);
Commit	Line	Data
1da177e4 LT	1	/*
	2	i2c-via.c - Part of lm_sensors, Linux kernel modules
	3	for hardware monitoring
	4
	5	i2c Support for Via Technologies 82C586B South Bridge
	6
96de0e25	7	Copyright (c) 1998, 1999 Kyösti Mälkki <kmalkki@cc.hut.fi>
1da177e4 LT	8
	9	This program is free software; you can redistribute it and/or modify
	10	it under the terms of the GNU General Public License as published by
	11	the Free Software Foundation; either version 2 of the License, or
	12	(at your option) any later version.
	13
	14	This program is distributed in the hope that it will be useful,
	15	but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	17	GNU General Public License for more details.
	18
	19	You should have received a copy of the GNU General Public License
	20	along with this program; if not, write to the Free Software
	21	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	22	*/
	23
1da177e4 LT	24	#include <linux/kernel.h>
	25	#include <linux/module.h>
	26	#include <linux/pci.h>
	27	#include <linux/ioport.h>
	28	#include <linux/init.h>
	29	#include <linux/i2c.h>
	30	#include <linux/i2c-algo-bit.h>
	31	#include <asm/io.h>
	32
	33	/* Power management registers */
	34	#define PM_CFG_REVID 0x08 /* silicon revision code */
	35	#define PM_CFG_IOBASE0 0x20
	36	#define PM_CFG_IOBASE1 0x48
	37
	38	#define I2C_DIR (pm_io_base+0x40)
	39	#define I2C_OUT (pm_io_base+0x42)
	40	#define I2C_IN (pm_io_base+0x44)
	41	#define I2C_SCL 0x02 /* clock bit in DIR/OUT/IN register */
	42	#define I2C_SDA 0x04
	43
	44	/* io-region reservation */
	45	#define IOSPACE 0x06
1da177e4	46
d6072f84	47	static struct pci_driver vt586b_driver;
60507095	48	static u16 pm_io_base;
1da177e4 LT	49
	50	/*
	51	It does not appear from the datasheet that the GPIO pins are
	52	open drain. So a we set a low value by setting the direction to
	53	output and a high value by setting the direction to input and
	54	relying on the required I2C pullup. The data value is initialized
	55	to 0 in via_init() and never changed.
	56	*/
	57	static void bit_via_setscl(void *data, int state)
	58	{
	59	outb(state ? inb(I2C_DIR) & ~I2C_SCL : inb(I2C_DIR) \| I2C_SCL, I2C_DIR);
	60	}
	61
	62	static void bit_via_setsda(void *data, int state)
	63	{
	64	outb(state ? inb(I2C_DIR) & ~I2C_SDA : inb(I2C_DIR) \| I2C_SDA, I2C_DIR);
	65	}
	66
	67	static int bit_via_getscl(void *data)
	68	{
	69	return (0 != (inb(I2C_IN) & I2C_SCL));
	70	}
	71
	72	static int bit_via_getsda(void *data)
	73	{
	74	return (0 != (inb(I2C_IN) & I2C_SDA));
	75	}
	76
	77
	78	static struct i2c_algo_bit_data bit_data = {
	79	.setsda = bit_via_setsda,
	80	.setscl = bit_via_setscl,
	81	.getsda = bit_via_getsda,
	82	.getscl = bit_via_getscl,
	83	.udelay = 5,
1da177e4 LT	84	.timeout = HZ
	85	};
	86
	87	static struct i2c_adapter vt586b_adapter = {
	88	.owner = THIS_MODULE,
9ace555d	89	.id = I2C_HW_B_VIA,
1da177e4 LT	90	.class = I2C_CLASS_HWMON,
	91	.name = "VIA i2c",
	92	.algo_data = &bit_data,
	93	};
	94
	95
	96	static struct pci_device_id vt586b_ids[] __devinitdata = {
	97	{ PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C586_3) },
	98	{ 0, }
	99	};
	100
	101	MODULE_DEVICE_TABLE (pci, vt586b_ids);
	102
	103	static int __devinit vt586b_probe(struct pci_dev dev, const struct pci_device_id id)
	104	{
	105	u16 base;
	106	u8 rev;
	107	int res;
	108
	109	if (pm_io_base) {
	110	dev_err(&dev->dev, "i2c-via: Will only support one host\n");
	111	return -ENODEV;
	112	}
	113
	114	pci_read_config_byte(dev, PM_CFG_REVID, &rev);
	115
	116	switch (rev) {
	117	case 0x00:
	118	base = PM_CFG_IOBASE0;
	119	break;
	120	case 0x01:
	121	case 0x10:
	122	base = PM_CFG_IOBASE1;
	123	break;
	124
	125	default:
	126	base = PM_CFG_IOBASE1;
	127	/* later revision */
	128	}
	129
	130	pci_read_config_word(dev, base, &pm_io_base);
	131	pm_io_base &= (0xff << 8);
	132
d6072f84	133	if (!request_region(I2C_DIR, IOSPACE, vt586b_driver.name)) {
1da177e4 LT	134	dev_err(&dev->dev, "IO 0x%x-0x%x already in use\n", I2C_DIR, I2C_DIR + IOSPACE);
	135	return -ENODEV;
	136	}
	137
	138	outb(inb(I2C_DIR) & ~(I2C_SDA \| I2C_SCL), I2C_DIR);
	139	outb(inb(I2C_OUT) & ~(I2C_SDA \| I2C_SCL), I2C_OUT);
	140
405ae7d3	141	/* set up the sysfs linkage to our parent device */
1da177e4 LT	142	vt586b_adapter.dev.parent = &dev->dev;
	143
	144	res = i2c_bit_add_bus(&vt586b_adapter);
	145	if ( res < 0 ) {
	146	release_region(I2C_DIR, IOSPACE);
	147	pm_io_base = 0;
	148	return res;
	149	}
	150	return 0;
	151	}
	152
	153	static void __devexit vt586b_remove(struct pci_dev *dev)
	154	{
3269711b	155	i2c_del_adapter(&vt586b_adapter);
1da177e4 LT	156	release_region(I2C_DIR, IOSPACE);
	157	pm_io_base = 0;
	158	}
	159
	160
	161	static struct pci_driver vt586b_driver = {
	162	.name = "vt586b_smbus",
	163	.id_table = vt586b_ids,
	164	.probe = vt586b_probe,
	165	.remove = __devexit_p(vt586b_remove),
	166	};
	167
	168	static int __init i2c_vt586b_init(void)
	169	{
	170	return pci_register_driver(&vt586b_driver);
	171	}
	172
	173	static void __exit i2c_vt586b_exit(void)
	174	{
	175	pci_unregister_driver(&vt586b_driver);
	176	}
	177
	178
96de0e25	179	MODULE_AUTHOR("Kyösti Mälkki <kmalkki@cc.hut.fi>");
1da177e4 LT	180	MODULE_DESCRIPTION("i2c for Via vt82c586b southbridge");
	181	MODULE_LICENSE("GPL");
	182
	183	module_init(i2c_vt586b_init);
	184	module_exit(i2c_vt586b_exit);