Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Jan Engelhardt | 96de0e2 | 2007-10-19 23:21:04 +0200 | [diff] [blame] | 7 | Copyright (c) 1998, 1999 Kyösti Mälkki <kmalkki@cc.hut.fi> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | |
Jean Delvare | d6072f8 | 2005-09-25 16:37:04 +0200 | [diff] [blame] | 47 | static struct pci_driver vt586b_driver; |
Jean Delvare | 6050709 | 2005-09-25 16:23:07 +0200 | [diff] [blame] | 48 | static u16 pm_io_base; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | .timeout = HZ |
| 85 | }; |
| 86 | |
| 87 | static struct i2c_adapter vt586b_adapter = { |
| 88 | .owner = THIS_MODULE, |
Stephen Hemminger | 9ace555 | 2007-02-13 22:09:01 +0100 | [diff] [blame] | 89 | .id = I2C_HW_B_VIA, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Jean Delvare | d6072f8 | 2005-09-25 16:37:04 +0200 | [diff] [blame] | 133 | if (!request_region(I2C_DIR, IOSPACE, vt586b_driver.name)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Robert P. J. Day | 405ae7d | 2007-02-17 19:13:42 +0100 | [diff] [blame] | 141 | /* set up the sysfs linkage to our parent device */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | { |
Jean Delvare | 3269711 | 2006-12-10 21:21:33 +0100 | [diff] [blame] | 155 | i2c_del_adapter(&vt586b_adapter); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | release_region(I2C_DIR, IOSPACE); |
| 157 | pm_io_base = 0; |
| 158 | } |
| 159 | |
| 160 | |
| 161 | static struct pci_driver vt586b_driver = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Jan Engelhardt | 96de0e2 | 2007-10-19 23:21:04 +0200 | [diff] [blame] | 179 | MODULE_AUTHOR("Kyösti Mälkki <kmalkki@cc.hut.fi>"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |