i2c: Rename the PEC functionality bit
[linux-3.10.git] / drivers / i2c / busses / i2c-i801.c
1 /*
2     i2c-i801.c - Part of lm_sensors, Linux kernel modules for hardware
3               monitoring
4     Copyright (c) 1998 - 2002  Frodo Looijaard <frodol@dds.nl>,
5     Philip Edelbrock <phil@netroedge.com>, and Mark D. Studebaker
6     <mdsxyz123@yahoo.com>
7
8     This program is free software; you can redistribute it and/or modify
9     it under the terms of the GNU General Public License as published by
10     the Free Software Foundation; either version 2 of the License, or
11     (at your option) any later version.
12
13     This program is distributed in the hope that it will be useful,
14     but WITHOUT ANY WARRANTY; without even the implied warranty of
15     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16     GNU General Public License for more details.
17
18     You should have received a copy of the GNU General Public License
19     along with this program; if not, write to the Free Software
20     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 */
22
23 /*
24     SUPPORTED DEVICES   PCI ID
25     82801AA             2413
26     82801AB             2423
27     82801BA             2443
28     82801CA/CAM         2483
29     82801DB             24C3   (HW PEC supported)
30     82801EB             24D3   (HW PEC supported)
31     6300ESB             25A4
32     ICH6                266A
33     ICH7                27DA
34     ESB2                269B
35     ICH8                283E
36     ICH9                2930
37     Tolapai             5032
38     This driver supports several versions of Intel's I/O Controller Hubs (ICH).
39     For SMBus support, they are similar to the PIIX4 and are part
40     of Intel's '810' and other chipsets.
41     See the file Documentation/i2c/busses/i2c-i801 for details.
42     I2C Block Read and Process Call are not supported.
43 */
44
45 /* Note: we assume there can only be one I801, with one SMBus interface */
46
47 #include <linux/module.h>
48 #include <linux/pci.h>
49 #include <linux/kernel.h>
50 #include <linux/stddef.h>
51 #include <linux/delay.h>
52 #include <linux/ioport.h>
53 #include <linux/init.h>
54 #include <linux/i2c.h>
55 #include <asm/io.h>
56
57 /* I801 SMBus address offsets */
58 #define SMBHSTSTS       (0 + i801_smba)
59 #define SMBHSTCNT       (2 + i801_smba)
60 #define SMBHSTCMD       (3 + i801_smba)
61 #define SMBHSTADD       (4 + i801_smba)
62 #define SMBHSTDAT0      (5 + i801_smba)
63 #define SMBHSTDAT1      (6 + i801_smba)
64 #define SMBBLKDAT       (7 + i801_smba)
65 #define SMBPEC          (8 + i801_smba) /* ICH4 only */
66 #define SMBAUXSTS       (12 + i801_smba)        /* ICH4 only */
67 #define SMBAUXCTL       (13 + i801_smba)        /* ICH4 only */
68
69 /* PCI Address Constants */
70 #define SMBBAR          4
71 #define SMBHSTCFG       0x040
72
73 /* Host configuration bits for SMBHSTCFG */
74 #define SMBHSTCFG_HST_EN        1
75 #define SMBHSTCFG_SMB_SMI_EN    2
76 #define SMBHSTCFG_I2C_EN        4
77
78 /* Auxillary control register bits, ICH4+ only */
79 #define SMBAUXCTL_CRC           1
80 #define SMBAUXCTL_E32B          2
81
82 /* kill bit for SMBHSTCNT */
83 #define SMBHSTCNT_KILL          2
84
85 /* Other settings */
86 #define MAX_TIMEOUT             100
87 #define ENABLE_INT9             0       /* set to 0x01 to enable - untested */
88
89 /* I801 command constants */
90 #define I801_QUICK              0x00
91 #define I801_BYTE               0x04
92 #define I801_BYTE_DATA          0x08
93 #define I801_WORD_DATA          0x0C
94 #define I801_PROC_CALL          0x10    /* later chips only, unimplemented */
95 #define I801_BLOCK_DATA         0x14
96 #define I801_I2C_BLOCK_DATA     0x18    /* unimplemented */
97 #define I801_BLOCK_LAST         0x34
98 #define I801_I2C_BLOCK_LAST     0x38    /* unimplemented */
99 #define I801_START              0x40
100 #define I801_PEC_EN             0x80    /* ICH4 only */
101
102 /* I801 Hosts Status register bits */
103 #define SMBHSTSTS_BYTE_DONE     0x80
104 #define SMBHSTSTS_INUSE_STS     0x40
105 #define SMBHSTSTS_SMBALERT_STS  0x20
106 #define SMBHSTSTS_FAILED        0x10
107 #define SMBHSTSTS_BUS_ERR       0x08
108 #define SMBHSTSTS_DEV_ERR       0x04
109 #define SMBHSTSTS_INTR          0x02
110 #define SMBHSTSTS_HOST_BUSY     0x01
111
112 static unsigned long i801_smba;
113 static unsigned char i801_original_hstcfg;
114 static struct pci_driver i801_driver;
115 static struct pci_dev *I801_dev;
116 static int isich4;
117
118 static int i801_transaction(int xact)
119 {
120         int temp;
121         int result = 0;
122         int timeout = 0;
123
124         dev_dbg(&I801_dev->dev, "Transaction (pre): CNT=%02x, CMD=%02x, "
125                 "ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb_p(SMBHSTCNT),
126                 inb_p(SMBHSTCMD), inb_p(SMBHSTADD), inb_p(SMBHSTDAT0),
127                 inb_p(SMBHSTDAT1));
128
129         /* Make sure the SMBus host is ready to start transmitting */
130         /* 0x1f = Failed, Bus_Err, Dev_Err, Intr, Host_Busy */
131         if ((temp = (0x1f & inb_p(SMBHSTSTS))) != 0x00) {
132                 dev_dbg(&I801_dev->dev, "SMBus busy (%02x). Resetting...\n",
133                         temp);
134                 outb_p(temp, SMBHSTSTS);
135                 if ((temp = (0x1f & inb_p(SMBHSTSTS))) != 0x00) {
136                         dev_dbg(&I801_dev->dev, "Failed! (%02x)\n", temp);
137                         return -1;
138                 } else {
139                         dev_dbg(&I801_dev->dev, "Successful!\n");
140                 }
141         }
142
143         /* the current contents of SMBHSTCNT can be overwritten, since PEC,
144          * INTREN, SMBSCMD are passed in xact */
145         outb_p(xact | I801_START, SMBHSTCNT);
146
147         /* We will always wait for a fraction of a second! */
148         do {
149                 msleep(1);
150                 temp = inb_p(SMBHSTSTS);
151         } while ((temp & SMBHSTSTS_HOST_BUSY) && (timeout++ < MAX_TIMEOUT));
152
153         /* If the SMBus is still busy, we give up */
154         if (timeout >= MAX_TIMEOUT) {
155                 dev_dbg(&I801_dev->dev, "SMBus Timeout!\n");
156                 result = -1;
157                 /* try to stop the current command */
158                 dev_dbg(&I801_dev->dev, "Terminating the current operation\n");
159                 outb_p(inb_p(SMBHSTCNT) | SMBHSTCNT_KILL, SMBHSTCNT);
160                 msleep(1);
161                 outb_p(inb_p(SMBHSTCNT) & (~SMBHSTCNT_KILL), SMBHSTCNT);
162         }
163
164         if (temp & SMBHSTSTS_FAILED) {
165                 result = -1;
166                 dev_dbg(&I801_dev->dev, "Error: Failed bus transaction\n");
167         }
168
169         if (temp & SMBHSTSTS_BUS_ERR) {
170                 result = -1;
171                 dev_err(&I801_dev->dev, "Bus collision! SMBus may be locked "
172                         "until next hard reset. (sorry!)\n");
173                 /* Clock stops and slave is stuck in mid-transmission */
174         }
175
176         if (temp & SMBHSTSTS_DEV_ERR) {
177                 result = -1;
178                 dev_dbg(&I801_dev->dev, "Error: no response!\n");
179         }
180
181         if ((inb_p(SMBHSTSTS) & 0x1f) != 0x00)
182                 outb_p(inb(SMBHSTSTS), SMBHSTSTS);
183
184         if ((temp = (0x1f & inb_p(SMBHSTSTS))) != 0x00) {
185                 dev_dbg(&I801_dev->dev, "Failed reset at end of transaction "
186                         "(%02x)\n", temp);
187         }
188         dev_dbg(&I801_dev->dev, "Transaction (post): CNT=%02x, CMD=%02x, "
189                 "ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb_p(SMBHSTCNT),
190                 inb_p(SMBHSTCMD), inb_p(SMBHSTADD), inb_p(SMBHSTDAT0),
191                 inb_p(SMBHSTDAT1));
192         return result;
193 }
194
195 /* wait for INTR bit as advised by Intel */
196 static void i801_wait_hwpec(void)
197 {
198         int timeout = 0;
199         int temp;
200
201         do {
202                 msleep(1);
203                 temp = inb_p(SMBHSTSTS);
204         } while ((!(temp & SMBHSTSTS_INTR))
205                  && (timeout++ < MAX_TIMEOUT));
206
207         if (timeout >= MAX_TIMEOUT) {
208                 dev_dbg(&I801_dev->dev, "PEC Timeout!\n");
209         }
210         outb_p(temp, SMBHSTSTS);
211 }
212
213 static int i801_block_transaction_by_block(union i2c_smbus_data *data,
214                                            char read_write, int hwpec)
215 {
216         int i, len;
217
218         inb_p(SMBHSTCNT); /* reset the data buffer index */
219
220         /* Use 32-byte buffer to process this transaction */
221         if (read_write == I2C_SMBUS_WRITE) {
222                 len = data->block[0];
223                 outb_p(len, SMBHSTDAT0);
224                 for (i = 0; i < len; i++)
225                         outb_p(data->block[i+1], SMBBLKDAT);
226         }
227
228         if (i801_transaction(I801_BLOCK_DATA | ENABLE_INT9 |
229                              I801_PEC_EN * hwpec))
230                 return -1;
231
232         if (read_write == I2C_SMBUS_READ) {
233                 len = inb_p(SMBHSTDAT0);
234                 if (len < 1 || len > I2C_SMBUS_BLOCK_MAX)
235                         return -1;
236
237                 data->block[0] = len;
238                 for (i = 0; i < len; i++)
239                         data->block[i + 1] = inb_p(SMBBLKDAT);
240         }
241         return 0;
242 }
243
244 static int i801_block_transaction_byte_by_byte(union i2c_smbus_data *data,
245                                                char read_write, int hwpec)
246 {
247         int i, len;
248         int smbcmd;
249         int temp;
250         int result = 0;
251         int timeout;
252         unsigned char errmask;
253
254         len = data->block[0];
255
256         if (read_write == I2C_SMBUS_WRITE) {
257                 outb_p(len, SMBHSTDAT0);
258                 outb_p(data->block[1], SMBBLKDAT);
259         }
260
261         for (i = 1; i <= len; i++) {
262                 if (i == len && read_write == I2C_SMBUS_READ)
263                         smbcmd = I801_BLOCK_LAST;
264                 else
265                         smbcmd = I801_BLOCK_DATA;
266                 outb_p(smbcmd | ENABLE_INT9, SMBHSTCNT);
267
268                 dev_dbg(&I801_dev->dev, "Block (pre %d): CNT=%02x, CMD=%02x, "
269                         "ADD=%02x, DAT0=%02x, BLKDAT=%02x\n", i,
270                         inb_p(SMBHSTCNT), inb_p(SMBHSTCMD), inb_p(SMBHSTADD),
271                         inb_p(SMBHSTDAT0), inb_p(SMBBLKDAT));
272
273                 /* Make sure the SMBus host is ready to start transmitting */
274                 temp = inb_p(SMBHSTSTS);
275                 if (i == 1) {
276                         /* Erroneous conditions before transaction:
277                          * Byte_Done, Failed, Bus_Err, Dev_Err, Intr, Host_Busy */
278                         errmask = 0x9f;
279                 } else {
280                         /* Erroneous conditions during transaction:
281                          * Failed, Bus_Err, Dev_Err, Intr */
282                         errmask = 0x1e;
283                 }
284                 if (temp & errmask) {
285                         dev_dbg(&I801_dev->dev, "SMBus busy (%02x). "
286                                 "Resetting...\n", temp);
287                         outb_p(temp, SMBHSTSTS);
288                         if (((temp = inb_p(SMBHSTSTS)) & errmask) != 0x00) {
289                                 dev_err(&I801_dev->dev,
290                                         "Reset failed! (%02x)\n", temp);
291                                 return -1;
292                         }
293                         if (i != 1)
294                                 /* if die in middle of block transaction, fail */
295                                 return -1;
296                 }
297
298                 if (i == 1)
299                         outb_p(inb(SMBHSTCNT) | I801_START, SMBHSTCNT);
300
301                 /* We will always wait for a fraction of a second! */
302                 timeout = 0;
303                 do {
304                         msleep(1);
305                         temp = inb_p(SMBHSTSTS);
306                 }
307                 while ((!(temp & SMBHSTSTS_BYTE_DONE))
308                        && (timeout++ < MAX_TIMEOUT));
309
310                 /* If the SMBus is still busy, we give up */
311                 if (timeout >= MAX_TIMEOUT) {
312                         /* try to stop the current command */
313                         dev_dbg(&I801_dev->dev, "Terminating the current "
314                                                 "operation\n");
315                         outb_p(inb_p(SMBHSTCNT) | SMBHSTCNT_KILL, SMBHSTCNT);
316                         msleep(1);
317                         outb_p(inb_p(SMBHSTCNT) & (~SMBHSTCNT_KILL),
318                                 SMBHSTCNT);
319                         result = -1;
320                         dev_dbg(&I801_dev->dev, "SMBus Timeout!\n");
321                 }
322
323                 if (temp & SMBHSTSTS_FAILED) {
324                         result = -1;
325                         dev_dbg(&I801_dev->dev,
326                                 "Error: Failed bus transaction\n");
327                 } else if (temp & SMBHSTSTS_BUS_ERR) {
328                         result = -1;
329                         dev_err(&I801_dev->dev, "Bus collision!\n");
330                 } else if (temp & SMBHSTSTS_DEV_ERR) {
331                         result = -1;
332                         dev_dbg(&I801_dev->dev, "Error: no response!\n");
333                 }
334
335                 if (i == 1 && read_write == I2C_SMBUS_READ) {
336                         len = inb_p(SMBHSTDAT0);
337                         if (len < 1 || len > I2C_SMBUS_BLOCK_MAX)
338                                 return -1;
339                         data->block[0] = len;
340                 }
341
342                 /* Retrieve/store value in SMBBLKDAT */
343                 if (read_write == I2C_SMBUS_READ)
344                         data->block[i] = inb_p(SMBBLKDAT);
345                 if (read_write == I2C_SMBUS_WRITE && i+1 <= len)
346                         outb_p(data->block[i+1], SMBBLKDAT);
347                 if ((temp & 0x9e) != 0x00)
348                         outb_p(temp, SMBHSTSTS);  /* signals SMBBLKDAT ready */
349
350                 if ((temp = (0x1e & inb_p(SMBHSTSTS))) != 0x00) {
351                         dev_dbg(&I801_dev->dev,
352                                 "Bad status (%02x) at end of transaction\n",
353                                 temp);
354                 }
355                 dev_dbg(&I801_dev->dev, "Block (post %d): CNT=%02x, CMD=%02x, "
356                         "ADD=%02x, DAT0=%02x, BLKDAT=%02x\n", i,
357                         inb_p(SMBHSTCNT), inb_p(SMBHSTCMD), inb_p(SMBHSTADD),
358                         inb_p(SMBHSTDAT0), inb_p(SMBBLKDAT));
359
360                 if (result < 0)
361                         return result;
362         }
363         return result;
364 }
365
366 static int i801_set_block_buffer_mode(void)
367 {
368         outb_p(inb_p(SMBAUXCTL) | SMBAUXCTL_E32B, SMBAUXCTL);
369         if ((inb_p(SMBAUXCTL) & SMBAUXCTL_E32B) == 0)
370                 return -1;
371         return 0;
372 }
373
374 /* Block transaction function */
375 static int i801_block_transaction(union i2c_smbus_data *data, char read_write,
376                                   int command, int hwpec)
377 {
378         int result = 0;
379         unsigned char hostc;
380
381         if (command == I2C_SMBUS_I2C_BLOCK_DATA) {
382                 if (read_write == I2C_SMBUS_WRITE) {
383                         /* set I2C_EN bit in configuration register */
384                         pci_read_config_byte(I801_dev, SMBHSTCFG, &hostc);
385                         pci_write_config_byte(I801_dev, SMBHSTCFG,
386                                               hostc | SMBHSTCFG_I2C_EN);
387                 } else {
388                         dev_err(&I801_dev->dev,
389                                 "I2C_SMBUS_I2C_BLOCK_READ not DB!\n");
390                         return -1;
391                 }
392         }
393
394         if (read_write == I2C_SMBUS_WRITE) {
395                 if (data->block[0] < 1)
396                         data->block[0] = 1;
397                 if (data->block[0] > I2C_SMBUS_BLOCK_MAX)
398                         data->block[0] = I2C_SMBUS_BLOCK_MAX;
399         } else {
400                 data->block[0] = 32;    /* max for reads */
401         }
402
403         if (isich4 && i801_set_block_buffer_mode() == 0 )
404                 result = i801_block_transaction_by_block(data, read_write,
405                                                          hwpec);
406         else
407                 result = i801_block_transaction_byte_by_byte(data, read_write,
408                                                              hwpec);
409
410         if (result == 0 && hwpec)
411                 i801_wait_hwpec();
412
413         if (command == I2C_SMBUS_I2C_BLOCK_DATA) {
414                 /* restore saved configuration register value */
415                 pci_write_config_byte(I801_dev, SMBHSTCFG, hostc);
416         }
417         return result;
418 }
419
420 /* Return -1 on error. */
421 static s32 i801_access(struct i2c_adapter * adap, u16 addr,
422                        unsigned short flags, char read_write, u8 command,
423                        int size, union i2c_smbus_data * data)
424 {
425         int hwpec;
426         int block = 0;
427         int ret, xact = 0;
428
429         hwpec = isich4 && (flags & I2C_CLIENT_PEC)
430                 && size != I2C_SMBUS_QUICK
431                 && size != I2C_SMBUS_I2C_BLOCK_DATA;
432
433         switch (size) {
434         case I2C_SMBUS_QUICK:
435                 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
436                        SMBHSTADD);
437                 xact = I801_QUICK;
438                 break;
439         case I2C_SMBUS_BYTE:
440                 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
441                        SMBHSTADD);
442                 if (read_write == I2C_SMBUS_WRITE)
443                         outb_p(command, SMBHSTCMD);
444                 xact = I801_BYTE;
445                 break;
446         case I2C_SMBUS_BYTE_DATA:
447                 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
448                        SMBHSTADD);
449                 outb_p(command, SMBHSTCMD);
450                 if (read_write == I2C_SMBUS_WRITE)
451                         outb_p(data->byte, SMBHSTDAT0);
452                 xact = I801_BYTE_DATA;
453                 break;
454         case I2C_SMBUS_WORD_DATA:
455                 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
456                        SMBHSTADD);
457                 outb_p(command, SMBHSTCMD);
458                 if (read_write == I2C_SMBUS_WRITE) {
459                         outb_p(data->word & 0xff, SMBHSTDAT0);
460                         outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1);
461                 }
462                 xact = I801_WORD_DATA;
463                 break;
464         case I2C_SMBUS_BLOCK_DATA:
465         case I2C_SMBUS_I2C_BLOCK_DATA:
466                 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
467                        SMBHSTADD);
468                 outb_p(command, SMBHSTCMD);
469                 block = 1;
470                 break;
471         case I2C_SMBUS_PROC_CALL:
472         default:
473                 dev_err(&I801_dev->dev, "Unsupported transaction %d\n", size);
474                 return -1;
475         }
476
477         if (hwpec)      /* enable/disable hardware PEC */
478                 outb_p(inb_p(SMBAUXCTL) | SMBAUXCTL_CRC, SMBAUXCTL);
479         else
480                 outb_p(inb_p(SMBAUXCTL) & (~SMBAUXCTL_CRC), SMBAUXCTL);
481
482         if(block)
483                 ret = i801_block_transaction(data, read_write, size, hwpec);
484         else
485                 ret = i801_transaction(xact | ENABLE_INT9);
486
487         /* Some BIOSes don't like it when PEC is enabled at reboot or resume
488            time, so we forcibly disable it after every transaction. Turn off
489            E32B for the same reason. */
490         if (hwpec)
491                 outb_p(inb_p(SMBAUXCTL) & ~(SMBAUXCTL_CRC | SMBAUXCTL_E32B),
492                        SMBAUXCTL);
493
494         if(block)
495                 return ret;
496         if(ret)
497                 return -1;
498         if ((read_write == I2C_SMBUS_WRITE) || (xact == I801_QUICK))
499                 return 0;
500
501         switch (xact & 0x7f) {
502         case I801_BYTE: /* Result put in SMBHSTDAT0 */
503         case I801_BYTE_DATA:
504                 data->byte = inb_p(SMBHSTDAT0);
505                 break;
506         case I801_WORD_DATA:
507                 data->word = inb_p(SMBHSTDAT0) + (inb_p(SMBHSTDAT1) << 8);
508                 break;
509         }
510         return 0;
511 }
512
513
514 static u32 i801_func(struct i2c_adapter *adapter)
515 {
516         return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
517             I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
518             I2C_FUNC_SMBUS_BLOCK_DATA | I2C_FUNC_SMBUS_WRITE_I2C_BLOCK
519              | (isich4 ? I2C_FUNC_SMBUS_PEC : 0);
520 }
521
522 static const struct i2c_algorithm smbus_algorithm = {
523         .smbus_xfer     = i801_access,
524         .functionality  = i801_func,
525 };
526
527 static struct i2c_adapter i801_adapter = {
528         .owner          = THIS_MODULE,
529         .id             = I2C_HW_SMBUS_I801,
530         .class          = I2C_CLASS_HWMON,
531         .algo           = &smbus_algorithm,
532 };
533
534 static struct pci_device_id i801_ids[] = {
535         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801AA_3) },
536         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801AB_3) },
537         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801BA_2) },
538         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_3) },
539         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_3) },
540         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_3) },
541         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB_4) },
542         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_16) },
543         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_17) },
544         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB2_17) },
545         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH8_5) },
546         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH9_6) },
547         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_TOLAPAI_1) },
548         { 0, }
549 };
550
551 MODULE_DEVICE_TABLE (pci, i801_ids);
552
553 static int __devinit i801_probe(struct pci_dev *dev, const struct pci_device_id *id)
554 {
555         unsigned char temp;
556         int err;
557
558         I801_dev = dev;
559         switch (dev->device) {
560         case PCI_DEVICE_ID_INTEL_82801DB_3:
561         case PCI_DEVICE_ID_INTEL_82801EB_3:
562         case PCI_DEVICE_ID_INTEL_ESB_4:
563         case PCI_DEVICE_ID_INTEL_ICH6_16:
564         case PCI_DEVICE_ID_INTEL_ICH7_17:
565         case PCI_DEVICE_ID_INTEL_ESB2_17:
566         case PCI_DEVICE_ID_INTEL_ICH8_5:
567         case PCI_DEVICE_ID_INTEL_ICH9_6:
568         case PCI_DEVICE_ID_INTEL_TOLAPAI_1:
569                 isich4 = 1;
570                 break;
571         default:
572                 isich4 = 0;
573         }
574
575         err = pci_enable_device(dev);
576         if (err) {
577                 dev_err(&dev->dev, "Failed to enable SMBus PCI device (%d)\n",
578                         err);
579                 goto exit;
580         }
581
582         /* Determine the address of the SMBus area */
583         i801_smba = pci_resource_start(dev, SMBBAR);
584         if (!i801_smba) {
585                 dev_err(&dev->dev, "SMBus base address uninitialized, "
586                         "upgrade BIOS\n");
587                 err = -ENODEV;
588                 goto exit;
589         }
590
591         err = pci_request_region(dev, SMBBAR, i801_driver.name);
592         if (err) {
593                 dev_err(&dev->dev, "Failed to request SMBus region "
594                         "0x%lx-0x%Lx\n", i801_smba,
595                         (unsigned long long)pci_resource_end(dev, SMBBAR));
596                 goto exit;
597         }
598
599         pci_read_config_byte(I801_dev, SMBHSTCFG, &temp);
600         i801_original_hstcfg = temp;
601         temp &= ~SMBHSTCFG_I2C_EN;      /* SMBus timing */
602         if (!(temp & SMBHSTCFG_HST_EN)) {
603                 dev_info(&dev->dev, "Enabling SMBus device\n");
604                 temp |= SMBHSTCFG_HST_EN;
605         }
606         pci_write_config_byte(I801_dev, SMBHSTCFG, temp);
607
608         if (temp & SMBHSTCFG_SMB_SMI_EN)
609                 dev_dbg(&dev->dev, "SMBus using interrupt SMI#\n");
610         else
611                 dev_dbg(&dev->dev, "SMBus using PCI Interrupt\n");
612
613         /* set up the sysfs linkage to our parent device */
614         i801_adapter.dev.parent = &dev->dev;
615
616         snprintf(i801_adapter.name, sizeof(i801_adapter.name),
617                 "SMBus I801 adapter at %04lx", i801_smba);
618         err = i2c_add_adapter(&i801_adapter);
619         if (err) {
620                 dev_err(&dev->dev, "Failed to add SMBus adapter\n");
621                 goto exit_release;
622         }
623         return 0;
624
625 exit_release:
626         pci_release_region(dev, SMBBAR);
627 exit:
628         return err;
629 }
630
631 static void __devexit i801_remove(struct pci_dev *dev)
632 {
633         i2c_del_adapter(&i801_adapter);
634         pci_write_config_byte(I801_dev, SMBHSTCFG, i801_original_hstcfg);
635         pci_release_region(dev, SMBBAR);
636         /*
637          * do not call pci_disable_device(dev) since it can cause hard hangs on
638          * some systems during power-off (eg. Fujitsu-Siemens Lifebook E8010)
639          */
640 }
641
642 #ifdef CONFIG_PM
643 static int i801_suspend(struct pci_dev *dev, pm_message_t mesg)
644 {
645         pci_save_state(dev);
646         pci_write_config_byte(dev, SMBHSTCFG, i801_original_hstcfg);
647         pci_set_power_state(dev, pci_choose_state(dev, mesg));
648         return 0;
649 }
650
651 static int i801_resume(struct pci_dev *dev)
652 {
653         pci_set_power_state(dev, PCI_D0);
654         pci_restore_state(dev);
655         return pci_enable_device(dev);
656 }
657 #else
658 #define i801_suspend NULL
659 #define i801_resume NULL
660 #endif
661
662 static struct pci_driver i801_driver = {
663         .name           = "i801_smbus",
664         .id_table       = i801_ids,
665         .probe          = i801_probe,
666         .remove         = __devexit_p(i801_remove),
667         .suspend        = i801_suspend,
668         .resume         = i801_resume,
669 };
670
671 static int __init i2c_i801_init(void)
672 {
673         return pci_register_driver(&i801_driver);
674 }
675
676 static void __exit i2c_i801_exit(void)
677 {
678         pci_unregister_driver(&i801_driver);
679 }
680
681 MODULE_AUTHOR ("Frodo Looijaard <frodol@dds.nl>, "
682                 "Philip Edelbrock <phil@netroedge.com>, "
683                 "and Mark D. Studebaker <mdsxyz123@yahoo.com>");
684 MODULE_DESCRIPTION("I801 SMBus driver");
685 MODULE_LICENSE("GPL");
686
687 module_init(i2c_i801_init);
688 module_exit(i2c_i801_exit);