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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); |