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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 i2c-isch.c - Linux kernel driver for Intel SCH chipset SMBus
4 - Based on i2c-piix4.c
5 Copyright (c) 1998 - 2002 Frodo Looijaard <frodol@dds.nl> and
6 Philip Edelbrock <phil@netroedge.com>
7 - Intel SCH support
8 Copyright (c) 2007 - 2008 Jacob Jun Pan <jacob.jun.pan@intel.com>
9
10*/
11
12/*
13 Supports:
14 Intel SCH chipsets (AF82US15W, AF82US15L, AF82UL11L)
15 Note: we assume there can only be one device, with one SMBus interface.
16*/
17
18#include <linux/module.h>
19#include <linux/platform_device.h>
20#include <linux/kernel.h>
21#include <linux/delay.h>
22#include <linux/stddef.h>
23#include <linux/ioport.h>
24#include <linux/i2c.h>
25#include <linux/io.h>
26
27/* SCH SMBus address offsets */
28#define SMBHSTCNT (0 + sch_smba)
29#define SMBHSTSTS (1 + sch_smba)
30#define SMBHSTCLK (2 + sch_smba)
31#define SMBHSTADD (4 + sch_smba) /* TSA */
32#define SMBHSTCMD (5 + sch_smba)
33#define SMBHSTDAT0 (6 + sch_smba)
34#define SMBHSTDAT1 (7 + sch_smba)
35#define SMBBLKDAT (0x20 + sch_smba)
36
37/* Other settings */
38#define MAX_RETRIES 5000
39
40/* I2C constants */
41#define SCH_QUICK 0x00
42#define SCH_BYTE 0x01
43#define SCH_BYTE_DATA 0x02
44#define SCH_WORD_DATA 0x03
45#define SCH_BLOCK_DATA 0x05
46
47static unsigned short sch_smba;
48static struct i2c_adapter sch_adapter;
49static int backbone_speed = 33000; /* backbone speed in kHz */
50module_param(backbone_speed, int, S_IRUSR | S_IWUSR);
51MODULE_PARM_DESC(backbone_speed, "Backbone speed in kHz, (default = 33000)");
52
53/*
54 * Start the i2c transaction -- the i2c_access will prepare the transaction
55 * and this function will execute it.
56 * return 0 for success and others for failure.
57 */
58static int sch_transaction(void)
59{
60 int temp;
61 int result = 0;
62 int retries = 0;
63
64 dev_dbg(&sch_adapter.dev, "Transaction (pre): CNT=%02x, CMD=%02x, "
65 "ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb(SMBHSTCNT),
66 inb(SMBHSTCMD), inb(SMBHSTADD), inb(SMBHSTDAT0),
67 inb(SMBHSTDAT1));
68
69 /* Make sure the SMBus host is ready to start transmitting */
70 temp = inb(SMBHSTSTS) & 0x0f;
71 if (temp) {
72 /* Can not be busy since we checked it in sch_access */
73 if (temp & 0x01) {
74 dev_dbg(&sch_adapter.dev, "Completion (%02x). "
75 "Clear...\n", temp);
76 }
77 if (temp & 0x06) {
78 dev_dbg(&sch_adapter.dev, "SMBus error (%02x). "
79 "Resetting...\n", temp);
80 }
81 outb(temp, SMBHSTSTS);
82 temp = inb(SMBHSTSTS) & 0x0f;
83 if (temp) {
84 dev_err(&sch_adapter.dev,
85 "SMBus is not ready: (%02x)\n", temp);
86 return -EAGAIN;
87 }
88 }
89
90 /* start the transaction by setting bit 4 */
91 outb(inb(SMBHSTCNT) | 0x10, SMBHSTCNT);
92
93 do {
94 usleep_range(100, 200);
95 temp = inb(SMBHSTSTS) & 0x0f;
96 } while ((temp & 0x08) && (retries++ < MAX_RETRIES));
97
98 /* If the SMBus is still busy, we give up */
99 if (retries > MAX_RETRIES) {
100 dev_err(&sch_adapter.dev, "SMBus Timeout!\n");
101 result = -ETIMEDOUT;
102 }
103 if (temp & 0x04) {
104 result = -EIO;
105 dev_dbg(&sch_adapter.dev, "Bus collision! SMBus may be "
106 "locked until next hard reset. (sorry!)\n");
107 /* Clock stops and slave is stuck in mid-transmission */
108 } else if (temp & 0x02) {
109 result = -EIO;
110 dev_err(&sch_adapter.dev, "Error: no response!\n");
111 } else if (temp & 0x01) {
112 dev_dbg(&sch_adapter.dev, "Post complete!\n");
113 outb(temp, SMBHSTSTS);
114 temp = inb(SMBHSTSTS) & 0x07;
115 if (temp & 0x06) {
116 /* Completion clear failed */
117 dev_dbg(&sch_adapter.dev, "Failed reset at end of "
118 "transaction (%02x), Bus error!\n", temp);
119 }
120 } else {
121 result = -ENXIO;
122 dev_dbg(&sch_adapter.dev, "No such address.\n");
123 }
124 dev_dbg(&sch_adapter.dev, "Transaction (post): CNT=%02x, CMD=%02x, "
125 "ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb(SMBHSTCNT),
126 inb(SMBHSTCMD), inb(SMBHSTADD), inb(SMBHSTDAT0),
127 inb(SMBHSTDAT1));
128 return result;
129}
130
131/*
132 * This is the main access entry for i2c-sch access
133 * adap is i2c_adapter pointer, addr is the i2c device bus address, read_write
134 * (0 for read and 1 for write), size is i2c transaction type and data is the
135 * union of transaction for data to be transferred or data read from bus.
136 * return 0 for success and others for failure.
137 */
138static s32 sch_access(struct i2c_adapter *adap, u16 addr,
139 unsigned short flags, char read_write,
140 u8 command, int size, union i2c_smbus_data *data)
141{
142 int i, len, temp, rc;
143
144 /* Make sure the SMBus host is not busy */
145 temp = inb(SMBHSTSTS) & 0x0f;
146 if (temp & 0x08) {
147 dev_dbg(&sch_adapter.dev, "SMBus busy (%02x)\n", temp);
148 return -EAGAIN;
149 }
150 temp = inw(SMBHSTCLK);
151 if (!temp) {
152 /*
153 * We can't determine if we have 33 or 25 MHz clock for
154 * SMBus, so expect 33 MHz and calculate a bus clock of
155 * 100 kHz. If we actually run at 25 MHz the bus will be
156 * run ~75 kHz instead which should do no harm.
157 */
158 dev_notice(&sch_adapter.dev,
159 "Clock divider uninitialized. Setting defaults\n");
160 outw(backbone_speed / (4 * 100), SMBHSTCLK);
161 }
162
163 dev_dbg(&sch_adapter.dev, "access size: %d %s\n", size,
164 (read_write)?"READ":"WRITE");
165 switch (size) {
166 case I2C_SMBUS_QUICK:
167 outb((addr << 1) | read_write, SMBHSTADD);
168 size = SCH_QUICK;
169 break;
170 case I2C_SMBUS_BYTE:
171 outb((addr << 1) | read_write, SMBHSTADD);
172 if (read_write == I2C_SMBUS_WRITE)
173 outb(command, SMBHSTCMD);
174 size = SCH_BYTE;
175 break;
176 case I2C_SMBUS_BYTE_DATA:
177 outb((addr << 1) | read_write, SMBHSTADD);
178 outb(command, SMBHSTCMD);
179 if (read_write == I2C_SMBUS_WRITE)
180 outb(data->byte, SMBHSTDAT0);
181 size = SCH_BYTE_DATA;
182 break;
183 case I2C_SMBUS_WORD_DATA:
184 outb((addr << 1) | read_write, SMBHSTADD);
185 outb(command, SMBHSTCMD);
186 if (read_write == I2C_SMBUS_WRITE) {
187 outb(data->word & 0xff, SMBHSTDAT0);
188 outb((data->word & 0xff00) >> 8, SMBHSTDAT1);
189 }
190 size = SCH_WORD_DATA;
191 break;
192 case I2C_SMBUS_BLOCK_DATA:
193 outb((addr << 1) | read_write, SMBHSTADD);
194 outb(command, SMBHSTCMD);
195 if (read_write == I2C_SMBUS_WRITE) {
196 len = data->block[0];
197 if (len == 0 || len > I2C_SMBUS_BLOCK_MAX)
198 return -EINVAL;
199 outb(len, SMBHSTDAT0);
200 for (i = 1; i <= len; i++)
201 outb(data->block[i], SMBBLKDAT+i-1);
202 }
203 size = SCH_BLOCK_DATA;
204 break;
205 default:
206 dev_warn(&adap->dev, "Unsupported transaction %d\n", size);
207 return -EOPNOTSUPP;
208 }
209 dev_dbg(&sch_adapter.dev, "write size %d to 0x%04x\n", size, SMBHSTCNT);
210 outb((inb(SMBHSTCNT) & 0xb0) | (size & 0x7), SMBHSTCNT);
211
212 rc = sch_transaction();
213 if (rc) /* Error in transaction */
214 return rc;
215
216 if ((read_write == I2C_SMBUS_WRITE) || (size == SCH_QUICK))
217 return 0;
218
219 switch (size) {
220 case SCH_BYTE:
221 case SCH_BYTE_DATA:
222 data->byte = inb(SMBHSTDAT0);
223 break;
224 case SCH_WORD_DATA:
225 data->word = inb(SMBHSTDAT0) + (inb(SMBHSTDAT1) << 8);
226 break;
227 case SCH_BLOCK_DATA:
228 data->block[0] = inb(SMBHSTDAT0);
229 if (data->block[0] == 0 || data->block[0] > I2C_SMBUS_BLOCK_MAX)
230 return -EPROTO;
231 for (i = 1; i <= data->block[0]; i++)
232 data->block[i] = inb(SMBBLKDAT+i-1);
233 break;
234 }
235 return 0;
236}
237
238static u32 sch_func(struct i2c_adapter *adapter)
239{
240 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
241 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
242 I2C_FUNC_SMBUS_BLOCK_DATA;
243}
244
245static const struct i2c_algorithm smbus_algorithm = {
246 .smbus_xfer = sch_access,
247 .functionality = sch_func,
248};
249
250static struct i2c_adapter sch_adapter = {
251 .owner = THIS_MODULE,
252 .class = I2C_CLASS_HWMON,
253 .algo = &smbus_algorithm,
254};
255
256static int smbus_sch_probe(struct platform_device *dev)
257{
258 struct resource *res;
259 int retval;
260
261 res = platform_get_resource(dev, IORESOURCE_IO, 0);
262 if (!res)
263 return -EBUSY;
264
265 if (!devm_request_region(&dev->dev, res->start, resource_size(res),
266 dev->name)) {
267 dev_err(&dev->dev, "SMBus region 0x%x already in use!\n",
268 sch_smba);
269 return -EBUSY;
270 }
271
272 sch_smba = res->start;
273
274 dev_dbg(&dev->dev, "SMBA = 0x%X\n", sch_smba);
275
276 /* set up the sysfs linkage to our parent device */
277 sch_adapter.dev.parent = &dev->dev;
278
279 snprintf(sch_adapter.name, sizeof(sch_adapter.name),
280 "SMBus SCH adapter at %04x", sch_smba);
281
282 retval = i2c_add_adapter(&sch_adapter);
283 if (retval)
284 sch_smba = 0;
285
286 return retval;
287}
288
289static void smbus_sch_remove(struct platform_device *pdev)
290{
291 if (sch_smba) {
292 i2c_del_adapter(&sch_adapter);
293 sch_smba = 0;
294 }
295}
296
297static struct platform_driver smbus_sch_driver = {
298 .driver = {
299 .name = "isch_smbus",
300 },
301 .probe = smbus_sch_probe,
302 .remove_new = smbus_sch_remove,
303};
304
305module_platform_driver(smbus_sch_driver);
306
307MODULE_AUTHOR("Jacob Pan <jacob.jun.pan@intel.com>");
308MODULE_DESCRIPTION("Intel SCH SMBus driver");
309MODULE_LICENSE("GPL");
310MODULE_ALIAS("platform:isch_smbus");
1/*
2 i2c-isch.c - Linux kernel driver for Intel SCH chipset SMBus
3 - Based on i2c-piix4.c
4 Copyright (c) 1998 - 2002 Frodo Looijaard <frodol@dds.nl> and
5 Philip Edelbrock <phil@netroedge.com>
6 - Intel SCH support
7 Copyright (c) 2007 - 2008 Jacob Jun Pan <jacob.jun.pan@intel.com>
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 version 2 as
11 published by the Free Software Foundation.
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 Supports:
25 Intel SCH chipsets (AF82US15W, AF82US15L, AF82UL11L)
26 Note: we assume there can only be one device, with one SMBus interface.
27*/
28
29#include <linux/module.h>
30#include <linux/platform_device.h>
31#include <linux/kernel.h>
32#include <linux/delay.h>
33#include <linux/stddef.h>
34#include <linux/ioport.h>
35#include <linux/i2c.h>
36#include <linux/init.h>
37#include <linux/io.h>
38#include <linux/acpi.h>
39
40/* SCH SMBus address offsets */
41#define SMBHSTCNT (0 + sch_smba)
42#define SMBHSTSTS (1 + sch_smba)
43#define SMBHSTADD (4 + sch_smba) /* TSA */
44#define SMBHSTCMD (5 + sch_smba)
45#define SMBHSTDAT0 (6 + sch_smba)
46#define SMBHSTDAT1 (7 + sch_smba)
47#define SMBBLKDAT (0x20 + sch_smba)
48
49/* Other settings */
50#define MAX_RETRIES 5000
51
52/* I2C constants */
53#define SCH_QUICK 0x00
54#define SCH_BYTE 0x01
55#define SCH_BYTE_DATA 0x02
56#define SCH_WORD_DATA 0x03
57#define SCH_BLOCK_DATA 0x05
58
59static unsigned short sch_smba;
60static struct i2c_adapter sch_adapter;
61
62/*
63 * Start the i2c transaction -- the i2c_access will prepare the transaction
64 * and this function will execute it.
65 * return 0 for success and others for failure.
66 */
67static int sch_transaction(void)
68{
69 int temp;
70 int result = 0;
71 int retries = 0;
72
73 dev_dbg(&sch_adapter.dev, "Transaction (pre): CNT=%02x, CMD=%02x, "
74 "ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb(SMBHSTCNT),
75 inb(SMBHSTCMD), inb(SMBHSTADD), inb(SMBHSTDAT0),
76 inb(SMBHSTDAT1));
77
78 /* Make sure the SMBus host is ready to start transmitting */
79 temp = inb(SMBHSTSTS) & 0x0f;
80 if (temp) {
81 /* Can not be busy since we checked it in sch_access */
82 if (temp & 0x01) {
83 dev_dbg(&sch_adapter.dev, "Completion (%02x). "
84 "Clear...\n", temp);
85 }
86 if (temp & 0x06) {
87 dev_dbg(&sch_adapter.dev, "SMBus error (%02x). "
88 "Resetting...\n", temp);
89 }
90 outb(temp, SMBHSTSTS);
91 temp = inb(SMBHSTSTS) & 0x0f;
92 if (temp) {
93 dev_err(&sch_adapter.dev,
94 "SMBus is not ready: (%02x)\n", temp);
95 return -EAGAIN;
96 }
97 }
98
99 /* start the transaction by setting bit 4 */
100 outb(inb(SMBHSTCNT) | 0x10, SMBHSTCNT);
101
102 do {
103 usleep_range(100, 200);
104 temp = inb(SMBHSTSTS) & 0x0f;
105 } while ((temp & 0x08) && (retries++ < MAX_RETRIES));
106
107 /* If the SMBus is still busy, we give up */
108 if (retries > MAX_RETRIES) {
109 dev_err(&sch_adapter.dev, "SMBus Timeout!\n");
110 result = -ETIMEDOUT;
111 }
112 if (temp & 0x04) {
113 result = -EIO;
114 dev_dbg(&sch_adapter.dev, "Bus collision! SMBus may be "
115 "locked until next hard reset. (sorry!)\n");
116 /* Clock stops and slave is stuck in mid-transmission */
117 } else if (temp & 0x02) {
118 result = -EIO;
119 dev_err(&sch_adapter.dev, "Error: no response!\n");
120 } else if (temp & 0x01) {
121 dev_dbg(&sch_adapter.dev, "Post complete!\n");
122 outb(temp, SMBHSTSTS);
123 temp = inb(SMBHSTSTS) & 0x07;
124 if (temp & 0x06) {
125 /* Completion clear failed */
126 dev_dbg(&sch_adapter.dev, "Failed reset at end of "
127 "transaction (%02x), Bus error!\n", temp);
128 }
129 } else {
130 result = -ENXIO;
131 dev_dbg(&sch_adapter.dev, "No such address.\n");
132 }
133 dev_dbg(&sch_adapter.dev, "Transaction (post): CNT=%02x, CMD=%02x, "
134 "ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb(SMBHSTCNT),
135 inb(SMBHSTCMD), inb(SMBHSTADD), inb(SMBHSTDAT0),
136 inb(SMBHSTDAT1));
137 return result;
138}
139
140/*
141 * This is the main access entry for i2c-sch access
142 * adap is i2c_adapter pointer, addr is the i2c device bus address, read_write
143 * (0 for read and 1 for write), size is i2c transaction type and data is the
144 * union of transaction for data to be transferred or data read from bus.
145 * return 0 for success and others for failure.
146 */
147static s32 sch_access(struct i2c_adapter *adap, u16 addr,
148 unsigned short flags, char read_write,
149 u8 command, int size, union i2c_smbus_data *data)
150{
151 int i, len, temp, rc;
152
153 /* Make sure the SMBus host is not busy */
154 temp = inb(SMBHSTSTS) & 0x0f;
155 if (temp & 0x08) {
156 dev_dbg(&sch_adapter.dev, "SMBus busy (%02x)\n", temp);
157 return -EAGAIN;
158 }
159 dev_dbg(&sch_adapter.dev, "access size: %d %s\n", size,
160 (read_write)?"READ":"WRITE");
161 switch (size) {
162 case I2C_SMBUS_QUICK:
163 outb((addr << 1) | read_write, SMBHSTADD);
164 size = SCH_QUICK;
165 break;
166 case I2C_SMBUS_BYTE:
167 outb((addr << 1) | read_write, SMBHSTADD);
168 if (read_write == I2C_SMBUS_WRITE)
169 outb(command, SMBHSTCMD);
170 size = SCH_BYTE;
171 break;
172 case I2C_SMBUS_BYTE_DATA:
173 outb((addr << 1) | read_write, SMBHSTADD);
174 outb(command, SMBHSTCMD);
175 if (read_write == I2C_SMBUS_WRITE)
176 outb(data->byte, SMBHSTDAT0);
177 size = SCH_BYTE_DATA;
178 break;
179 case I2C_SMBUS_WORD_DATA:
180 outb((addr << 1) | read_write, SMBHSTADD);
181 outb(command, SMBHSTCMD);
182 if (read_write == I2C_SMBUS_WRITE) {
183 outb(data->word & 0xff, SMBHSTDAT0);
184 outb((data->word & 0xff00) >> 8, SMBHSTDAT1);
185 }
186 size = SCH_WORD_DATA;
187 break;
188 case I2C_SMBUS_BLOCK_DATA:
189 outb((addr << 1) | read_write, SMBHSTADD);
190 outb(command, SMBHSTCMD);
191 if (read_write == I2C_SMBUS_WRITE) {
192 len = data->block[0];
193 if (len == 0 || len > I2C_SMBUS_BLOCK_MAX)
194 return -EINVAL;
195 outb(len, SMBHSTDAT0);
196 for (i = 1; i <= len; i++)
197 outb(data->block[i], SMBBLKDAT+i-1);
198 }
199 size = SCH_BLOCK_DATA;
200 break;
201 default:
202 dev_warn(&adap->dev, "Unsupported transaction %d\n", size);
203 return -EOPNOTSUPP;
204 }
205 dev_dbg(&sch_adapter.dev, "write size %d to 0x%04x\n", size, SMBHSTCNT);
206 outb((inb(SMBHSTCNT) & 0xb0) | (size & 0x7), SMBHSTCNT);
207
208 rc = sch_transaction();
209 if (rc) /* Error in transaction */
210 return rc;
211
212 if ((read_write == I2C_SMBUS_WRITE) || (size == SCH_QUICK))
213 return 0;
214
215 switch (size) {
216 case SCH_BYTE:
217 case SCH_BYTE_DATA:
218 data->byte = inb(SMBHSTDAT0);
219 break;
220 case SCH_WORD_DATA:
221 data->word = inb(SMBHSTDAT0) + (inb(SMBHSTDAT1) << 8);
222 break;
223 case SCH_BLOCK_DATA:
224 data->block[0] = inb(SMBHSTDAT0);
225 if (data->block[0] == 0 || data->block[0] > I2C_SMBUS_BLOCK_MAX)
226 return -EPROTO;
227 for (i = 1; i <= data->block[0]; i++)
228 data->block[i] = inb(SMBBLKDAT+i-1);
229 break;
230 }
231 return 0;
232}
233
234static u32 sch_func(struct i2c_adapter *adapter)
235{
236 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
237 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
238 I2C_FUNC_SMBUS_BLOCK_DATA;
239}
240
241static const struct i2c_algorithm smbus_algorithm = {
242 .smbus_xfer = sch_access,
243 .functionality = sch_func,
244};
245
246static struct i2c_adapter sch_adapter = {
247 .owner = THIS_MODULE,
248 .class = I2C_CLASS_HWMON | I2C_CLASS_SPD,
249 .algo = &smbus_algorithm,
250};
251
252static int __devinit smbus_sch_probe(struct platform_device *dev)
253{
254 struct resource *res;
255 int retval;
256
257 res = platform_get_resource(dev, IORESOURCE_IO, 0);
258 if (!res)
259 return -EBUSY;
260
261 if (!request_region(res->start, resource_size(res), dev->name)) {
262 dev_err(&dev->dev, "SMBus region 0x%x already in use!\n",
263 sch_smba);
264 return -EBUSY;
265 }
266
267 sch_smba = res->start;
268
269 dev_dbg(&dev->dev, "SMBA = 0x%X\n", sch_smba);
270
271 /* set up the sysfs linkage to our parent device */
272 sch_adapter.dev.parent = &dev->dev;
273
274 snprintf(sch_adapter.name, sizeof(sch_adapter.name),
275 "SMBus SCH adapter at %04x", sch_smba);
276
277 retval = i2c_add_adapter(&sch_adapter);
278 if (retval) {
279 dev_err(&dev->dev, "Couldn't register adapter!\n");
280 release_region(res->start, resource_size(res));
281 sch_smba = 0;
282 }
283
284 return retval;
285}
286
287static int __devexit smbus_sch_remove(struct platform_device *pdev)
288{
289 struct resource *res;
290 if (sch_smba) {
291 i2c_del_adapter(&sch_adapter);
292 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
293 release_region(res->start, resource_size(res));
294 sch_smba = 0;
295 }
296
297 return 0;
298}
299
300static struct platform_driver smbus_sch_driver = {
301 .driver = {
302 .name = "isch_smbus",
303 .owner = THIS_MODULE,
304 },
305 .probe = smbus_sch_probe,
306 .remove = __devexit_p(smbus_sch_remove),
307};
308
309module_platform_driver(smbus_sch_driver);
310
311MODULE_AUTHOR("Jacob Pan <jacob.jun.pan@intel.com>");
312MODULE_DESCRIPTION("Intel SCH SMBus driver");
313MODULE_LICENSE("GPL");
314MODULE_ALIAS("platform:isch_smbus");