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-rw-r--r--drivers/i2c/i2c-acpi.c364
1 files changed, 0 insertions, 364 deletions
diff --git a/drivers/i2c/i2c-acpi.c b/drivers/i2c/i2c-acpi.c
deleted file mode 100644
index 0dbc18c15c43..000000000000
--- a/drivers/i2c/i2c-acpi.c
+++ /dev/null
@@ -1,364 +0,0 @@
1/*
2 * I2C ACPI code
3 *
4 * Copyright (C) 2014 Intel Corp
5 *
6 * Author: Lan Tianyu <tianyu.lan@intel.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 version 2 as
10 * published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 * for more details.
16 */
17#define pr_fmt(fmt) "I2C/ACPI : " fmt
18
19#include <linux/kernel.h>
20#include <linux/errno.h>
21#include <linux/err.h>
22#include <linux/i2c.h>
23#include <linux/acpi.h>
24
25struct acpi_i2c_handler_data {
26 struct acpi_connection_info info;
27 struct i2c_adapter *adapter;
28};
29
30struct gsb_buffer {
31 u8 status;
32 u8 len;
33 union {
34 u16 wdata;
35 u8 bdata;
36 u8 data[0];
37 };
38} __packed;
39
40static int acpi_i2c_add_resource(struct acpi_resource *ares, void *data)
41{
42 struct i2c_board_info *info = data;
43
44 if (ares->type == ACPI_RESOURCE_TYPE_SERIAL_BUS) {
45 struct acpi_resource_i2c_serialbus *sb;
46
47 sb = &ares->data.i2c_serial_bus;
48 if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_I2C) {
49 info->addr = sb->slave_address;
50 if (sb->access_mode == ACPI_I2C_10BIT_MODE)
51 info->flags |= I2C_CLIENT_TEN;
52 }
53 } else if (info->irq < 0) {
54 struct resource r;
55
56 if (acpi_dev_resource_interrupt(ares, 0, &r))
57 info->irq = r.start;
58 }
59
60 /* Tell the ACPI core to skip this resource */
61 return 1;
62}
63
64static acpi_status acpi_i2c_add_device(acpi_handle handle, u32 level,
65 void *data, void **return_value)
66{
67 struct i2c_adapter *adapter = data;
68 struct list_head resource_list;
69 struct i2c_board_info info;
70 struct acpi_device *adev;
71 int ret;
72
73 if (acpi_bus_get_device(handle, &adev))
74 return AE_OK;
75 if (acpi_bus_get_status(adev) || !adev->status.present)
76 return AE_OK;
77
78 memset(&info, 0, sizeof(info));
79 info.acpi_node.companion = adev;
80 info.irq = -1;
81
82 INIT_LIST_HEAD(&resource_list);
83 ret = acpi_dev_get_resources(adev, &resource_list,
84 acpi_i2c_add_resource, &info);
85 acpi_dev_free_resource_list(&resource_list);
86
87 if (ret < 0 || !info.addr)
88 return AE_OK;
89
90 adev->power.flags.ignore_parent = true;
91 strlcpy(info.type, dev_name(&adev->dev), sizeof(info.type));
92 if (!i2c_new_device(adapter, &info)) {
93 adev->power.flags.ignore_parent = false;
94 dev_err(&adapter->dev,
95 "failed to add I2C device %s from ACPI\n",
96 dev_name(&adev->dev));
97 }
98
99 return AE_OK;
100}
101
102/**
103 * acpi_i2c_register_devices - enumerate I2C slave devices behind adapter
104 * @adap: pointer to adapter
105 *
106 * Enumerate all I2C slave devices behind this adapter by walking the ACPI
107 * namespace. When a device is found it will be added to the Linux device
108 * model and bound to the corresponding ACPI handle.
109 */
110void acpi_i2c_register_devices(struct i2c_adapter *adap)
111{
112 acpi_handle handle;
113 acpi_status status;
114
115 if (!adap->dev.parent)
116 return;
117
118 handle = ACPI_HANDLE(adap->dev.parent);
119 if (!handle)
120 return;
121
122 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
123 acpi_i2c_add_device, NULL,
124 adap, NULL);
125 if (ACPI_FAILURE(status))
126 dev_warn(&adap->dev, "failed to enumerate I2C slaves\n");
127}
128
129#ifdef CONFIG_ACPI_I2C_OPREGION
130static int acpi_gsb_i2c_read_bytes(struct i2c_client *client,
131 u8 cmd, u8 *data, u8 data_len)
132{
133
134 struct i2c_msg msgs[2];
135 int ret;
136 u8 *buffer;
137
138 buffer = kzalloc(data_len, GFP_KERNEL);
139 if (!buffer)
140 return AE_NO_MEMORY;
141
142 msgs[0].addr = client->addr;
143 msgs[0].flags = client->flags;
144 msgs[0].len = 1;
145 msgs[0].buf = &cmd;
146
147 msgs[1].addr = client->addr;
148 msgs[1].flags = client->flags | I2C_M_RD;
149 msgs[1].len = data_len;
150 msgs[1].buf = buffer;
151
152 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
153 if (ret < 0)
154 dev_err(&client->adapter->dev, "i2c read failed\n");
155 else
156 memcpy(data, buffer, data_len);
157
158 kfree(buffer);
159 return ret;
160}
161
162static int acpi_gsb_i2c_write_bytes(struct i2c_client *client,
163 u8 cmd, u8 *data, u8 data_len)
164{
165
166 struct i2c_msg msgs[1];
167 u8 *buffer;
168 int ret = AE_OK;
169
170 buffer = kzalloc(data_len + 1, GFP_KERNEL);
171 if (!buffer)
172 return AE_NO_MEMORY;
173
174 buffer[0] = cmd;
175 memcpy(buffer + 1, data, data_len);
176
177 msgs[0].addr = client->addr;
178 msgs[0].flags = client->flags;
179 msgs[0].len = data_len + 1;
180 msgs[0].buf = buffer;
181
182 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
183 if (ret < 0)
184 dev_err(&client->adapter->dev, "i2c write failed\n");
185
186 kfree(buffer);
187 return ret;
188}
189
190static acpi_status
191acpi_i2c_space_handler(u32 function, acpi_physical_address command,
192 u32 bits, u64 *value64,
193 void *handler_context, void *region_context)
194{
195 struct gsb_buffer *gsb = (struct gsb_buffer *)value64;
196 struct acpi_i2c_handler_data *data = handler_context;
197 struct acpi_connection_info *info = &data->info;
198 struct acpi_resource_i2c_serialbus *sb;
199 struct i2c_adapter *adapter = data->adapter;
200 struct i2c_client client;
201 struct acpi_resource *ares;
202 u32 accessor_type = function >> 16;
203 u8 action = function & ACPI_IO_MASK;
204 acpi_status ret = AE_OK;
205 int status;
206
207 ret = acpi_buffer_to_resource(info->connection, info->length, &ares);
208 if (ACPI_FAILURE(ret))
209 return ret;
210
211 if (!value64 || ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS) {
212 ret = AE_BAD_PARAMETER;
213 goto err;
214 }
215
216 sb = &ares->data.i2c_serial_bus;
217 if (sb->type != ACPI_RESOURCE_SERIAL_TYPE_I2C) {
218 ret = AE_BAD_PARAMETER;
219 goto err;
220 }
221
222 memset(&client, 0, sizeof(client));
223 client.adapter = adapter;
224 client.addr = sb->slave_address;
225 client.flags = 0;
226
227 if (sb->access_mode == ACPI_I2C_10BIT_MODE)
228 client.flags |= I2C_CLIENT_TEN;
229
230 switch (accessor_type) {
231 case ACPI_GSB_ACCESS_ATTRIB_SEND_RCV:
232 if (action == ACPI_READ) {
233 status = i2c_smbus_read_byte(&client);
234 if (status >= 0) {
235 gsb->bdata = status;
236 status = 0;
237 }
238 } else {
239 status = i2c_smbus_write_byte(&client, gsb->bdata);
240 }
241 break;
242
243 case ACPI_GSB_ACCESS_ATTRIB_BYTE:
244 if (action == ACPI_READ) {
245 status = i2c_smbus_read_byte_data(&client, command);
246 if (status >= 0) {
247 gsb->bdata = status;
248 status = 0;
249 }
250 } else {
251 status = i2c_smbus_write_byte_data(&client, command,
252 gsb->bdata);
253 }
254 break;
255
256 case ACPI_GSB_ACCESS_ATTRIB_WORD:
257 if (action == ACPI_READ) {
258 status = i2c_smbus_read_word_data(&client, command);
259 if (status >= 0) {
260 gsb->wdata = status;
261 status = 0;
262 }
263 } else {
264 status = i2c_smbus_write_word_data(&client, command,
265 gsb->wdata);
266 }
267 break;
268
269 case ACPI_GSB_ACCESS_ATTRIB_BLOCK:
270 if (action == ACPI_READ) {
271 status = i2c_smbus_read_block_data(&client, command,
272 gsb->data);
273 if (status >= 0) {
274 gsb->len = status;
275 status = 0;
276 }
277 } else {
278 status = i2c_smbus_write_block_data(&client, command,
279 gsb->len, gsb->data);
280 }
281 break;
282
283 case ACPI_GSB_ACCESS_ATTRIB_MULTIBYTE:
284 if (action == ACPI_READ) {
285 status = acpi_gsb_i2c_read_bytes(&client, command,
286 gsb->data, info->access_length);
287 if (status > 0)
288 status = 0;
289 } else {
290 status = acpi_gsb_i2c_write_bytes(&client, command,
291 gsb->data, info->access_length);
292 }
293 break;
294
295 default:
296 pr_info("protocol(0x%02x) is not supported.\n", accessor_type);
297 ret = AE_BAD_PARAMETER;
298 goto err;
299 }
300
301 gsb->status = status;
302
303 err:
304 ACPI_FREE(ares);
305 return ret;
306}
307
308
309int acpi_i2c_install_space_handler(struct i2c_adapter *adapter)
310{
311 acpi_handle handle = ACPI_HANDLE(adapter->dev.parent);
312 struct acpi_i2c_handler_data *data;
313 acpi_status status;
314
315 if (!handle)
316 return -ENODEV;
317
318 data = kzalloc(sizeof(struct acpi_i2c_handler_data),
319 GFP_KERNEL);
320 if (!data)
321 return -ENOMEM;
322
323 data->adapter = adapter;
324 status = acpi_bus_attach_private_data(handle, (void *)data);
325 if (ACPI_FAILURE(status)) {
326 kfree(data);
327 return -ENOMEM;
328 }
329
330 status = acpi_install_address_space_handler(handle,
331 ACPI_ADR_SPACE_GSBUS,
332 &acpi_i2c_space_handler,
333 NULL,
334 data);
335 if (ACPI_FAILURE(status)) {
336 dev_err(&adapter->dev, "Error installing i2c space handler\n");
337 acpi_bus_detach_private_data(handle);
338 kfree(data);
339 return -ENOMEM;
340 }
341
342 return 0;
343}
344
345void acpi_i2c_remove_space_handler(struct i2c_adapter *adapter)
346{
347 acpi_handle handle = ACPI_HANDLE(adapter->dev.parent);
348 struct acpi_i2c_handler_data *data;
349 acpi_status status;
350
351 if (!handle)
352 return;
353
354 acpi_remove_address_space_handler(handle,
355 ACPI_ADR_SPACE_GSBUS,
356 &acpi_i2c_space_handler);
357
358 status = acpi_bus_get_private_data(handle, (void **)&data);
359 if (ACPI_SUCCESS(status))
360 kfree(data);
361
362 acpi_bus_detach_private_data(handle);
363}
364#endif
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