2 sis5595.c - Part of lm_sensors, Linux kernel modules for hardware
4 Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl> and
5 Philip Edelbrock <phil@netroedge.com>
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 /* Note: we assume there can only be one SIS5595 with one SMBus interface */
25 Note: all have mfr. ID 0x1039.
29 Note: these chips contain a 0008 device which is incompatible with the
30 5595. We recognize these by the presence of the listed
31 "blacklist" PCI ID and refuse to load.
33 NOT SUPPORTED PCI ID BLACKLIST PCI ID
54 * Add Block Transfers (ugly, but supported by the adapter)
58 #include <linux/kernel.h>
59 #include <linux/module.h>
60 #include <linux/delay.h>
61 #include <linux/pci.h>
62 #include <linux/ioport.h>
63 #include <linux/init.h>
64 #include <linux/i2c.h>
67 static int blacklist[] = {
80 PCI_DEVICE_ID_SI_5511, /* 5513 chip has the 0008 device but that ID
81 shows up in other chips so we use the 5511
83 PCI_DEVICE_ID_SI_5597,
84 PCI_DEVICE_ID_SI_5598,
85 0, /* terminates the list */
88 /* Length of ISA address segment */
89 #define SIS5595_EXTENT 8
90 /* SIS5595 SMBus registers */
91 #define SMB_STS_LO 0x00
92 #define SMB_STS_HI 0x01
93 #define SMB_CTL_LO 0x02
94 #define SMB_CTL_HI 0x03
105 /* PCI Address Constants */
106 #define SMB_INDEX 0x38
108 #define SIS5595_ENABLE_REG 0x40
109 #define ACPI_BASE 0x90
112 #define MAX_TIMEOUT 500
114 /* SIS5595 constants */
115 #define SIS5595_QUICK 0x00
116 #define SIS5595_BYTE 0x02
117 #define SIS5595_BYTE_DATA 0x04
118 #define SIS5595_WORD_DATA 0x06
119 #define SIS5595_PROC_CALL 0x08
120 #define SIS5595_BLOCK_DATA 0x0A
122 /* insmod parameters */
124 /* If force_addr is set to anything different from 0, we forcibly enable
125 the device at the given address. */
126 static u16 force_addr;
127 module_param(force_addr, ushort, 0);
128 MODULE_PARM_DESC(force_addr, "Initialize the base address of the i2c controller");
130 static struct pci_driver sis5595_driver;
131 static unsigned short sis5595_base;
132 static struct pci_dev *sis5595_pdev;
134 static u8 sis5595_read(u8 reg)
136 outb(reg, sis5595_base + SMB_INDEX);
137 return inb(sis5595_base + SMB_DAT);
140 static void sis5595_write(u8 reg, u8 data)
142 outb(reg, sis5595_base + SMB_INDEX);
143 outb(data, sis5595_base + SMB_DAT);
146 static int sis5595_setup(struct pci_dev *SIS5595_dev)
151 int retval = -ENODEV;
153 /* Look for imposters */
154 for (i = blacklist; *i != 0; i++) {
156 dev = pci_get_device(PCI_VENDOR_ID_SI, *i, NULL);
158 dev_err(&SIS5595_dev->dev, "Looked for SIS5595 but found unsupported device %.4x\n", *i);
164 /* Determine the address of the SMBus areas */
165 pci_read_config_word(SIS5595_dev, ACPI_BASE, &sis5595_base);
166 if (sis5595_base == 0 && force_addr == 0) {
167 dev_err(&SIS5595_dev->dev, "ACPI base address uninitialized - upgrade BIOS or use force_addr=0xaddr\n");
172 sis5595_base = force_addr & ~(SIS5595_EXTENT - 1);
173 dev_dbg(&SIS5595_dev->dev, "ACPI Base address: %04x\n", sis5595_base);
175 /* NB: We grab just the two SMBus registers here, but this may still
176 * interfere with ACPI :-( */
177 if (!request_region(sis5595_base + SMB_INDEX, 2,
178 sis5595_driver.name)) {
179 dev_err(&SIS5595_dev->dev, "SMBus registers 0x%04x-0x%04x already in use!\n",
180 sis5595_base + SMB_INDEX, sis5595_base + SMB_INDEX + 1);
185 dev_info(&SIS5595_dev->dev, "forcing ISA address 0x%04X\n", sis5595_base);
186 if (pci_write_config_word(SIS5595_dev, ACPI_BASE, sis5595_base)
187 != PCIBIOS_SUCCESSFUL)
189 if (pci_read_config_word(SIS5595_dev, ACPI_BASE, &a)
190 != PCIBIOS_SUCCESSFUL)
192 if ((a & ~(SIS5595_EXTENT - 1)) != sis5595_base) {
193 /* doesn't work for some chips! */
194 dev_err(&SIS5595_dev->dev, "force address failed - not supported?\n");
199 if (pci_read_config_byte(SIS5595_dev, SIS5595_ENABLE_REG, &val)
200 != PCIBIOS_SUCCESSFUL)
202 if ((val & 0x80) == 0) {
203 dev_info(&SIS5595_dev->dev, "enabling ACPI\n");
204 if (pci_write_config_byte(SIS5595_dev, SIS5595_ENABLE_REG, val | 0x80)
205 != PCIBIOS_SUCCESSFUL)
207 if (pci_read_config_byte(SIS5595_dev, SIS5595_ENABLE_REG, &val)
208 != PCIBIOS_SUCCESSFUL)
210 if ((val & 0x80) == 0) {
211 /* doesn't work for some chips? */
212 dev_err(&SIS5595_dev->dev, "ACPI enable failed - not supported?\n");
217 /* Everything is happy */
221 release_region(sis5595_base + SMB_INDEX, 2);
225 static int sis5595_transaction(struct i2c_adapter *adap)
231 /* Make sure the SMBus host is ready to start transmitting */
232 temp = sis5595_read(SMB_STS_LO) + (sis5595_read(SMB_STS_HI) << 8);
234 dev_dbg(&adap->dev, "SMBus busy (%04x). Resetting...\n", temp);
235 sis5595_write(SMB_STS_LO, temp & 0xff);
236 sis5595_write(SMB_STS_HI, temp >> 8);
237 if ((temp = sis5595_read(SMB_STS_LO) + (sis5595_read(SMB_STS_HI) << 8)) != 0x00) {
238 dev_dbg(&adap->dev, "Failed! (%02x)\n", temp);
241 dev_dbg(&adap->dev, "Successful!\n");
245 /* start the transaction by setting bit 4 */
246 sis5595_write(SMB_CTL_LO, sis5595_read(SMB_CTL_LO) | 0x10);
248 /* We will always wait for a fraction of a second! */
251 temp = sis5595_read(SMB_STS_LO);
252 } while (!(temp & 0x40) && (timeout++ < MAX_TIMEOUT));
254 /* If the SMBus is still busy, we give up */
255 if (timeout >= MAX_TIMEOUT) {
256 dev_dbg(&adap->dev, "SMBus Timeout!\n");
261 dev_dbg(&adap->dev, "Error: Failed bus transaction\n");
266 dev_err(&adap->dev, "Bus collision! SMBus may be locked until "
267 "next hard reset (or not...)\n");
268 /* Clock stops and slave is stuck in mid-transmission */
272 temp = sis5595_read(SMB_STS_LO) + (sis5595_read(SMB_STS_HI) << 8);
274 sis5595_write(SMB_STS_LO, temp & 0xff);
275 sis5595_write(SMB_STS_HI, temp >> 8);
278 temp = sis5595_read(SMB_STS_LO) + (sis5595_read(SMB_STS_HI) << 8);
280 dev_dbg(&adap->dev, "Failed reset at end of transaction (%02x)\n", temp);
285 /* Return -1 on error. */
286 static s32 sis5595_access(struct i2c_adapter *adap, u16 addr,
287 unsigned short flags, char read_write,
288 u8 command, int size, union i2c_smbus_data *data)
291 case I2C_SMBUS_QUICK:
292 sis5595_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01));
293 size = SIS5595_QUICK;
296 sis5595_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01));
297 if (read_write == I2C_SMBUS_WRITE)
298 sis5595_write(SMB_CMD, command);
301 case I2C_SMBUS_BYTE_DATA:
302 sis5595_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01));
303 sis5595_write(SMB_CMD, command);
304 if (read_write == I2C_SMBUS_WRITE)
305 sis5595_write(SMB_BYTE, data->byte);
306 size = SIS5595_BYTE_DATA;
308 case I2C_SMBUS_PROC_CALL:
309 case I2C_SMBUS_WORD_DATA:
310 sis5595_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01));
311 sis5595_write(SMB_CMD, command);
312 if (read_write == I2C_SMBUS_WRITE) {
313 sis5595_write(SMB_BYTE, data->word & 0xff);
314 sis5595_write(SMB_BYTE + 1,
315 (data->word & 0xff00) >> 8);
317 size = (size == I2C_SMBUS_PROC_CALL) ? SIS5595_PROC_CALL : SIS5595_WORD_DATA;
320 dev_warn(&adap->dev, "Unsupported transaction %d\n", size);
324 sis5595_write(SMB_CTL_LO, ((size & 0x0E)));
326 if (sis5595_transaction(adap))
329 if ((size != SIS5595_PROC_CALL) &&
330 ((read_write == I2C_SMBUS_WRITE) || (size == SIS5595_QUICK)))
336 case SIS5595_BYTE_DATA:
337 data->byte = sis5595_read(SMB_BYTE);
339 case SIS5595_WORD_DATA:
340 case SIS5595_PROC_CALL:
341 data->word = sis5595_read(SMB_BYTE) + (sis5595_read(SMB_BYTE + 1) << 8);
347 static u32 sis5595_func(struct i2c_adapter *adapter)
349 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
350 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
351 I2C_FUNC_SMBUS_PROC_CALL;
354 static const struct i2c_algorithm smbus_algorithm = {
355 .smbus_xfer = sis5595_access,
356 .functionality = sis5595_func,
359 static struct i2c_adapter sis5595_adapter = {
360 .owner = THIS_MODULE,
361 .id = I2C_HW_SMBUS_SIS5595,
362 .class = I2C_CLASS_HWMON,
363 .algo = &smbus_algorithm,
366 static struct pci_device_id sis5595_ids[] __devinitdata = {
367 { PCI_DEVICE(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_503) },
371 MODULE_DEVICE_TABLE (pci, sis5595_ids);
373 static int __devinit sis5595_probe(struct pci_dev *dev, const struct pci_device_id *id)
377 if (sis5595_setup(dev)) {
378 dev_err(&dev->dev, "SIS5595 not detected, module not inserted.\n");
382 /* set up the sysfs linkage to our parent device */
383 sis5595_adapter.dev.parent = &dev->dev;
385 sprintf(sis5595_adapter.name, "SMBus SIS5595 adapter at %04x",
386 sis5595_base + SMB_INDEX);
387 err = i2c_add_adapter(&sis5595_adapter);
389 release_region(sis5595_base + SMB_INDEX, 2);
393 /* Always return failure here. This is to allow other drivers to bind
394 * to this pci device. We don't really want to have control over the
395 * pci device, we only wanted to read as few register values from it.
397 sis5595_pdev = pci_dev_get(dev);
401 static struct pci_driver sis5595_driver = {
402 .name = "sis5595_smbus",
403 .id_table = sis5595_ids,
404 .probe = sis5595_probe,
407 static int __init i2c_sis5595_init(void)
409 return pci_register_driver(&sis5595_driver);
412 static void __exit i2c_sis5595_exit(void)
414 pci_unregister_driver(&sis5595_driver);
416 i2c_del_adapter(&sis5595_adapter);
417 release_region(sis5595_base + SMB_INDEX, 2);
418 pci_dev_put(sis5595_pdev);
423 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>");
424 MODULE_DESCRIPTION("SIS5595 SMBus driver");
425 MODULE_LICENSE("GPL");
427 module_init(i2c_sis5595_init);
428 module_exit(i2c_sis5595_exit);