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dc985421 CC |
1 | /* |
2 | * SMBus driver for ACPI SMBus CMI | |
3 | * | |
4 | * Copyright (C) 2009 Crane Cai <crane.cai@amd.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation version 2. | |
9 | */ | |
10 | ||
11 | #include <linux/module.h> | |
12 | #include <linux/slab.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/stddef.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/i2c.h> | |
17 | #include <linux/acpi.h> | |
18 | ||
19 | #define ACPI_SMBUS_HC_CLASS "smbus" | |
20 | #define ACPI_SMBUS_HC_DEVICE_NAME "cmi" | |
21 | ||
22 | ACPI_MODULE_NAME("smbus_cmi"); | |
23 | ||
24 | struct smbus_methods_t { | |
25 | char *mt_info; | |
26 | char *mt_sbr; | |
27 | char *mt_sbw; | |
28 | }; | |
29 | ||
30 | struct acpi_smbus_cmi { | |
31 | acpi_handle handle; | |
32 | struct i2c_adapter adapter; | |
33 | u8 cap_info:1; | |
34 | u8 cap_read:1; | |
35 | u8 cap_write:1; | |
36 | }; | |
37 | ||
38 | static const struct smbus_methods_t smbus_methods = { | |
39 | .mt_info = "_SBI", | |
40 | .mt_sbr = "_SBR", | |
41 | .mt_sbw = "_SBW", | |
42 | }; | |
43 | ||
44 | static const struct acpi_device_id acpi_smbus_cmi_ids[] = { | |
45 | {"SMBUS01", 0}, | |
46 | {"", 0} | |
47 | }; | |
48 | ||
49 | #define ACPI_SMBUS_STATUS_OK 0x00 | |
50 | #define ACPI_SMBUS_STATUS_FAIL 0x07 | |
51 | #define ACPI_SMBUS_STATUS_DNAK 0x10 | |
52 | #define ACPI_SMBUS_STATUS_DERR 0x11 | |
53 | #define ACPI_SMBUS_STATUS_CMD_DENY 0x12 | |
54 | #define ACPI_SMBUS_STATUS_UNKNOWN 0x13 | |
55 | #define ACPI_SMBUS_STATUS_ACC_DENY 0x17 | |
56 | #define ACPI_SMBUS_STATUS_TIMEOUT 0x18 | |
57 | #define ACPI_SMBUS_STATUS_NOTSUP 0x19 | |
58 | #define ACPI_SMBUS_STATUS_BUSY 0x1a | |
59 | #define ACPI_SMBUS_STATUS_PEC 0x1f | |
60 | ||
61 | #define ACPI_SMBUS_PRTCL_WRITE 0x00 | |
62 | #define ACPI_SMBUS_PRTCL_READ 0x01 | |
63 | #define ACPI_SMBUS_PRTCL_QUICK 0x02 | |
64 | #define ACPI_SMBUS_PRTCL_BYTE 0x04 | |
65 | #define ACPI_SMBUS_PRTCL_BYTE_DATA 0x06 | |
66 | #define ACPI_SMBUS_PRTCL_WORD_DATA 0x08 | |
67 | #define ACPI_SMBUS_PRTCL_BLOCK_DATA 0x0a | |
68 | ||
69 | ||
70 | static int | |
71 | acpi_smbus_cmi_access(struct i2c_adapter *adap, u16 addr, unsigned short flags, | |
72 | char read_write, u8 command, int size, | |
73 | union i2c_smbus_data *data) | |
74 | { | |
75 | int result = 0; | |
76 | struct acpi_smbus_cmi *smbus_cmi = adap->algo_data; | |
77 | unsigned char protocol; | |
78 | acpi_status status = 0; | |
79 | struct acpi_object_list input; | |
80 | union acpi_object mt_params[5]; | |
81 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
82 | union acpi_object *obj; | |
83 | union acpi_object *pkg; | |
84 | char *method; | |
85 | int len = 0; | |
86 | ||
87 | dev_dbg(&adap->dev, "access size: %d %s\n", size, | |
88 | (read_write) ? "READ" : "WRITE"); | |
89 | switch (size) { | |
90 | case I2C_SMBUS_QUICK: | |
91 | protocol = ACPI_SMBUS_PRTCL_QUICK; | |
92 | command = 0; | |
93 | if (read_write == I2C_SMBUS_WRITE) { | |
94 | mt_params[3].type = ACPI_TYPE_INTEGER; | |
95 | mt_params[3].integer.value = 0; | |
96 | mt_params[4].type = ACPI_TYPE_INTEGER; | |
97 | mt_params[4].integer.value = 0; | |
98 | } | |
99 | break; | |
100 | ||
101 | case I2C_SMBUS_BYTE: | |
102 | protocol = ACPI_SMBUS_PRTCL_BYTE; | |
103 | if (read_write == I2C_SMBUS_WRITE) { | |
104 | mt_params[3].type = ACPI_TYPE_INTEGER; | |
105 | mt_params[3].integer.value = 0; | |
106 | mt_params[4].type = ACPI_TYPE_INTEGER; | |
107 | mt_params[4].integer.value = 0; | |
108 | } else { | |
109 | command = 0; | |
110 | } | |
111 | break; | |
112 | ||
113 | case I2C_SMBUS_BYTE_DATA: | |
114 | protocol = ACPI_SMBUS_PRTCL_BYTE_DATA; | |
115 | if (read_write == I2C_SMBUS_WRITE) { | |
116 | mt_params[3].type = ACPI_TYPE_INTEGER; | |
117 | mt_params[3].integer.value = 1; | |
118 | mt_params[4].type = ACPI_TYPE_INTEGER; | |
119 | mt_params[4].integer.value = data->byte; | |
120 | } | |
121 | break; | |
122 | ||
123 | case I2C_SMBUS_WORD_DATA: | |
124 | protocol = ACPI_SMBUS_PRTCL_WORD_DATA; | |
125 | if (read_write == I2C_SMBUS_WRITE) { | |
126 | mt_params[3].type = ACPI_TYPE_INTEGER; | |
127 | mt_params[3].integer.value = 2; | |
128 | mt_params[4].type = ACPI_TYPE_INTEGER; | |
129 | mt_params[4].integer.value = data->word; | |
130 | } | |
131 | break; | |
132 | ||
133 | case I2C_SMBUS_BLOCK_DATA: | |
134 | protocol = ACPI_SMBUS_PRTCL_BLOCK_DATA; | |
135 | if (read_write == I2C_SMBUS_WRITE) { | |
136 | len = data->block[0]; | |
137 | if (len == 0 || len > I2C_SMBUS_BLOCK_MAX) | |
138 | return -EINVAL; | |
139 | mt_params[3].type = ACPI_TYPE_INTEGER; | |
140 | mt_params[3].integer.value = len; | |
141 | mt_params[4].type = ACPI_TYPE_BUFFER; | |
142 | mt_params[4].buffer.pointer = data->block + 1; | |
143 | } | |
144 | break; | |
145 | ||
146 | default: | |
147 | dev_warn(&adap->dev, "Unsupported transaction %d\n", size); | |
148 | return -EOPNOTSUPP; | |
149 | } | |
150 | ||
151 | if (read_write == I2C_SMBUS_READ) { | |
152 | protocol |= ACPI_SMBUS_PRTCL_READ; | |
153 | method = smbus_methods.mt_sbr; | |
154 | input.count = 3; | |
155 | } else { | |
156 | protocol |= ACPI_SMBUS_PRTCL_WRITE; | |
157 | method = smbus_methods.mt_sbw; | |
158 | input.count = 5; | |
159 | } | |
160 | ||
161 | input.pointer = mt_params; | |
162 | mt_params[0].type = ACPI_TYPE_INTEGER; | |
163 | mt_params[0].integer.value = protocol; | |
164 | mt_params[1].type = ACPI_TYPE_INTEGER; | |
165 | mt_params[1].integer.value = addr; | |
166 | mt_params[2].type = ACPI_TYPE_INTEGER; | |
167 | mt_params[2].integer.value = command; | |
168 | ||
169 | status = acpi_evaluate_object(smbus_cmi->handle, method, &input, | |
170 | &buffer); | |
171 | if (ACPI_FAILURE(status)) { | |
172 | ACPI_ERROR((AE_INFO, "Evaluating %s: %i", method, status)); | |
173 | return -EIO; | |
174 | } | |
175 | ||
176 | pkg = buffer.pointer; | |
177 | if (pkg && pkg->type == ACPI_TYPE_PACKAGE) | |
178 | obj = pkg->package.elements; | |
179 | else { | |
180 | ACPI_ERROR((AE_INFO, "Invalid argument type")); | |
181 | result = -EIO; | |
182 | goto out; | |
183 | } | |
184 | if (obj == NULL || obj->type != ACPI_TYPE_INTEGER) { | |
185 | ACPI_ERROR((AE_INFO, "Invalid argument type")); | |
186 | result = -EIO; | |
187 | goto out; | |
188 | } | |
189 | ||
190 | result = obj->integer.value; | |
191 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s return status: %i\n", | |
192 | method, result)); | |
193 | ||
194 | switch (result) { | |
195 | case ACPI_SMBUS_STATUS_OK: | |
196 | result = 0; | |
197 | break; | |
198 | case ACPI_SMBUS_STATUS_BUSY: | |
199 | result = -EBUSY; | |
200 | goto out; | |
201 | case ACPI_SMBUS_STATUS_TIMEOUT: | |
202 | result = -ETIMEDOUT; | |
203 | goto out; | |
204 | case ACPI_SMBUS_STATUS_DNAK: | |
205 | result = -ENXIO; | |
206 | goto out; | |
207 | default: | |
208 | result = -EIO; | |
209 | goto out; | |
210 | } | |
211 | ||
212 | if (read_write == I2C_SMBUS_WRITE || size == I2C_SMBUS_QUICK) | |
213 | goto out; | |
214 | ||
215 | obj = pkg->package.elements + 1; | |
216 | if (obj == NULL || obj->type != ACPI_TYPE_INTEGER) { | |
217 | ACPI_ERROR((AE_INFO, "Invalid argument type")); | |
218 | result = -EIO; | |
219 | goto out; | |
220 | } | |
221 | ||
222 | len = obj->integer.value; | |
223 | obj = pkg->package.elements + 2; | |
224 | switch (size) { | |
225 | case I2C_SMBUS_BYTE: | |
226 | case I2C_SMBUS_BYTE_DATA: | |
227 | case I2C_SMBUS_WORD_DATA: | |
228 | if (obj == NULL || obj->type != ACPI_TYPE_INTEGER) { | |
229 | ACPI_ERROR((AE_INFO, "Invalid argument type")); | |
230 | result = -EIO; | |
231 | goto out; | |
232 | } | |
233 | if (len == 2) | |
234 | data->word = obj->integer.value; | |
235 | else | |
236 | data->byte = obj->integer.value; | |
237 | break; | |
238 | case I2C_SMBUS_BLOCK_DATA: | |
239 | if (obj == NULL || obj->type != ACPI_TYPE_BUFFER) { | |
240 | ACPI_ERROR((AE_INFO, "Invalid argument type")); | |
241 | result = -EIO; | |
242 | goto out; | |
243 | } | |
244 | if (len == 0 || len > I2C_SMBUS_BLOCK_MAX) | |
245 | return -EPROTO; | |
246 | data->block[0] = len; | |
247 | memcpy(data->block + 1, obj->buffer.pointer, len); | |
248 | break; | |
249 | } | |
250 | ||
251 | out: | |
252 | kfree(buffer.pointer); | |
253 | dev_dbg(&adap->dev, "Transaction status: %i\n", result); | |
254 | return result; | |
255 | } | |
256 | ||
257 | static u32 acpi_smbus_cmi_func(struct i2c_adapter *adapter) | |
258 | { | |
259 | struct acpi_smbus_cmi *smbus_cmi = adapter->algo_data; | |
260 | u32 ret; | |
261 | ||
262 | ret = smbus_cmi->cap_read | smbus_cmi->cap_write ? | |
263 | I2C_FUNC_SMBUS_QUICK : 0; | |
264 | ||
265 | ret |= smbus_cmi->cap_read ? | |
266 | (I2C_FUNC_SMBUS_READ_BYTE | | |
267 | I2C_FUNC_SMBUS_READ_BYTE_DATA | | |
268 | I2C_FUNC_SMBUS_READ_WORD_DATA | | |
269 | I2C_FUNC_SMBUS_READ_BLOCK_DATA) : 0; | |
270 | ||
271 | ret |= smbus_cmi->cap_write ? | |
272 | (I2C_FUNC_SMBUS_WRITE_BYTE | | |
273 | I2C_FUNC_SMBUS_WRITE_BYTE_DATA | | |
274 | I2C_FUNC_SMBUS_WRITE_WORD_DATA | | |
275 | I2C_FUNC_SMBUS_WRITE_BLOCK_DATA) : 0; | |
276 | ||
277 | return ret; | |
278 | } | |
279 | ||
280 | static const struct i2c_algorithm acpi_smbus_cmi_algorithm = { | |
281 | .smbus_xfer = acpi_smbus_cmi_access, | |
282 | .functionality = acpi_smbus_cmi_func, | |
283 | }; | |
284 | ||
285 | ||
286 | static int acpi_smbus_cmi_add_cap(struct acpi_smbus_cmi *smbus_cmi, | |
287 | const char *name) | |
288 | { | |
289 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
290 | union acpi_object *obj; | |
291 | acpi_status status; | |
292 | ||
293 | if (!strcmp(name, smbus_methods.mt_info)) { | |
294 | status = acpi_evaluate_object(smbus_cmi->handle, | |
295 | smbus_methods.mt_info, | |
296 | NULL, &buffer); | |
297 | if (ACPI_FAILURE(status)) { | |
298 | ACPI_ERROR((AE_INFO, "Evaluating %s: %i", | |
299 | smbus_methods.mt_info, status)); | |
300 | return -EIO; | |
301 | } | |
302 | ||
303 | obj = buffer.pointer; | |
304 | if (obj && obj->type == ACPI_TYPE_PACKAGE) | |
305 | obj = obj->package.elements; | |
306 | else { | |
307 | ACPI_ERROR((AE_INFO, "Invalid argument type")); | |
308 | kfree(buffer.pointer); | |
309 | return -EIO; | |
310 | } | |
311 | ||
312 | if (obj->type != ACPI_TYPE_INTEGER) { | |
313 | ACPI_ERROR((AE_INFO, "Invalid argument type")); | |
314 | kfree(buffer.pointer); | |
315 | return -EIO; | |
316 | } else | |
317 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "SMBus CMI Version %x" | |
318 | "\n", (int)obj->integer.value)); | |
319 | ||
320 | kfree(buffer.pointer); | |
321 | smbus_cmi->cap_info = 1; | |
322 | } else if (!strcmp(name, smbus_methods.mt_sbr)) | |
323 | smbus_cmi->cap_read = 1; | |
324 | else if (!strcmp(name, smbus_methods.mt_sbw)) | |
325 | smbus_cmi->cap_write = 1; | |
326 | else | |
327 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Unsupported CMI method: %s\n", | |
328 | name)); | |
329 | ||
330 | return 0; | |
331 | } | |
332 | ||
333 | static acpi_status acpi_smbus_cmi_query_methods(acpi_handle handle, u32 level, | |
334 | void *context, void **return_value) | |
335 | { | |
336 | char node_name[5]; | |
337 | struct acpi_buffer buffer = { sizeof(node_name), node_name }; | |
338 | struct acpi_smbus_cmi *smbus_cmi = context; | |
339 | acpi_status status; | |
340 | ||
341 | status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); | |
342 | ||
343 | if (ACPI_SUCCESS(status)) | |
344 | acpi_smbus_cmi_add_cap(smbus_cmi, node_name); | |
345 | ||
346 | return AE_OK; | |
347 | } | |
348 | ||
349 | static int acpi_smbus_cmi_add(struct acpi_device *device) | |
350 | { | |
351 | struct acpi_smbus_cmi *smbus_cmi; | |
352 | ||
353 | smbus_cmi = kzalloc(sizeof(struct acpi_smbus_cmi), GFP_KERNEL); | |
354 | if (!smbus_cmi) | |
355 | return -ENOMEM; | |
356 | ||
357 | smbus_cmi->handle = device->handle; | |
358 | strcpy(acpi_device_name(device), ACPI_SMBUS_HC_DEVICE_NAME); | |
359 | strcpy(acpi_device_class(device), ACPI_SMBUS_HC_CLASS); | |
360 | device->driver_data = smbus_cmi; | |
361 | smbus_cmi->cap_info = 0; | |
362 | smbus_cmi->cap_read = 0; | |
363 | smbus_cmi->cap_write = 0; | |
364 | ||
365 | acpi_walk_namespace(ACPI_TYPE_METHOD, smbus_cmi->handle, 1, | |
2263576c | 366 | acpi_smbus_cmi_query_methods, NULL, smbus_cmi, NULL); |
dc985421 CC |
367 | |
368 | if (smbus_cmi->cap_info == 0) | |
369 | goto err; | |
370 | ||
371 | snprintf(smbus_cmi->adapter.name, sizeof(smbus_cmi->adapter.name), | |
e96c9284 BH |
372 | "SMBus CMI adapter %s", |
373 | acpi_device_name(device)); | |
dc985421 CC |
374 | smbus_cmi->adapter.owner = THIS_MODULE; |
375 | smbus_cmi->adapter.algo = &acpi_smbus_cmi_algorithm; | |
376 | smbus_cmi->adapter.algo_data = smbus_cmi; | |
377 | smbus_cmi->adapter.class = I2C_CLASS_HWMON | I2C_CLASS_SPD; | |
378 | smbus_cmi->adapter.dev.parent = &device->dev; | |
379 | ||
380 | if (i2c_add_adapter(&smbus_cmi->adapter)) { | |
381 | dev_err(&device->dev, "Couldn't register adapter!\n"); | |
382 | goto err; | |
383 | } | |
384 | ||
385 | return 0; | |
386 | ||
387 | err: | |
388 | kfree(smbus_cmi); | |
389 | device->driver_data = NULL; | |
390 | return -EIO; | |
391 | } | |
392 | ||
393 | static int acpi_smbus_cmi_remove(struct acpi_device *device, int type) | |
394 | { | |
395 | struct acpi_smbus_cmi *smbus_cmi = acpi_driver_data(device); | |
396 | ||
397 | i2c_del_adapter(&smbus_cmi->adapter); | |
398 | kfree(smbus_cmi); | |
399 | device->driver_data = NULL; | |
400 | ||
401 | return 0; | |
402 | } | |
403 | ||
404 | static struct acpi_driver acpi_smbus_cmi_driver = { | |
405 | .name = ACPI_SMBUS_HC_DEVICE_NAME, | |
406 | .class = ACPI_SMBUS_HC_CLASS, | |
407 | .ids = acpi_smbus_cmi_ids, | |
408 | .ops = { | |
409 | .add = acpi_smbus_cmi_add, | |
410 | .remove = acpi_smbus_cmi_remove, | |
411 | }, | |
412 | }; | |
413 | ||
414 | static int __init acpi_smbus_cmi_init(void) | |
415 | { | |
416 | return acpi_bus_register_driver(&acpi_smbus_cmi_driver); | |
417 | } | |
418 | ||
419 | static void __exit acpi_smbus_cmi_exit(void) | |
420 | { | |
421 | acpi_bus_unregister_driver(&acpi_smbus_cmi_driver); | |
422 | } | |
423 | ||
424 | module_init(acpi_smbus_cmi_init); | |
425 | module_exit(acpi_smbus_cmi_exit); | |
426 | ||
427 | MODULE_LICENSE("GPL"); | |
428 | MODULE_AUTHOR("Crane Cai <crane.cai@amd.com>"); | |
429 | MODULE_DESCRIPTION("ACPI SMBus CMI driver"); |