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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 i2c Support for Apple SMU Controller
4
5 Copyright (c) 2005 Benjamin Herrenschmidt, IBM Corp.
6 <benh@kernel.crashing.org>
7
8
9*/
10
11#include <linux/module.h>
12#include <linux/kernel.h>
13#include <linux/types.h>
14#include <linux/i2c.h>
15#include <linux/device.h>
16#include <linux/platform_device.h>
17#include <linux/of_irq.h>
18
19#include <asm/pmac_low_i2c.h>
20
21MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
22MODULE_DESCRIPTION("I2C driver for Apple PowerMac");
23MODULE_LICENSE("GPL");
24
25/*
26 * SMBUS-type transfer entrypoint
27 */
28static s32 i2c_powermac_smbus_xfer( struct i2c_adapter* adap,
29 u16 addr,
30 unsigned short flags,
31 char read_write,
32 u8 command,
33 int size,
34 union i2c_smbus_data* data)
35{
36 struct pmac_i2c_bus *bus = i2c_get_adapdata(adap);
37 int rc = 0;
38 int read = (read_write == I2C_SMBUS_READ);
39 int addrdir = (addr << 1) | read;
40 int mode, subsize, len;
41 u32 subaddr;
42 u8 *buf;
43 u8 local[2];
44
45 if (size == I2C_SMBUS_QUICK || size == I2C_SMBUS_BYTE) {
46 mode = pmac_i2c_mode_std;
47 subsize = 0;
48 subaddr = 0;
49 } else {
50 mode = read ? pmac_i2c_mode_combined : pmac_i2c_mode_stdsub;
51 subsize = 1;
52 subaddr = command;
53 }
54
55 switch (size) {
56 case I2C_SMBUS_QUICK:
57 buf = NULL;
58 len = 0;
59 break;
60 case I2C_SMBUS_BYTE:
61 case I2C_SMBUS_BYTE_DATA:
62 buf = &data->byte;
63 len = 1;
64 break;
65 case I2C_SMBUS_WORD_DATA:
66 if (!read) {
67 local[0] = data->word & 0xff;
68 local[1] = (data->word >> 8) & 0xff;
69 }
70 buf = local;
71 len = 2;
72 break;
73
74 /* Note that these are broken vs. the expected smbus API where
75 * on reads, the length is actually returned from the function,
76 * but I think the current API makes no sense and I don't want
77 * any driver that I haven't verified for correctness to go
78 * anywhere near a pmac i2c bus anyway ...
79 */
80 case I2C_SMBUS_BLOCK_DATA:
81 buf = data->block;
82 len = data->block[0] + 1;
83 break;
84 case I2C_SMBUS_I2C_BLOCK_DATA:
85 buf = &data->block[1];
86 len = data->block[0];
87 break;
88
89 default:
90 return -EINVAL;
91 }
92
93 rc = pmac_i2c_open(bus, 0);
94 if (rc) {
95 dev_err(&adap->dev, "Failed to open I2C, err %d\n", rc);
96 return rc;
97 }
98
99 rc = pmac_i2c_setmode(bus, mode);
100 if (rc) {
101 dev_err(&adap->dev, "Failed to set I2C mode %d, err %d\n",
102 mode, rc);
103 goto bail;
104 }
105
106 rc = pmac_i2c_xfer(bus, addrdir, subsize, subaddr, buf, len);
107 if (rc) {
108 if (rc == -ENXIO)
109 dev_dbg(&adap->dev,
110 "I2C transfer at 0x%02x failed, size %d, "
111 "err %d\n", addrdir >> 1, size, rc);
112 else
113 dev_err(&adap->dev,
114 "I2C transfer at 0x%02x failed, size %d, "
115 "err %d\n", addrdir >> 1, size, rc);
116 goto bail;
117 }
118
119 if (size == I2C_SMBUS_WORD_DATA && read) {
120 data->word = ((u16)local[1]) << 8;
121 data->word |= local[0];
122 }
123
124 bail:
125 pmac_i2c_close(bus);
126 return rc;
127}
128
129/*
130 * Generic i2c master transfer entrypoint. This driver only support single
131 * messages (for "lame i2c" transfers). Anything else should use the smbus
132 * entry point
133 */
134static int i2c_powermac_master_xfer( struct i2c_adapter *adap,
135 struct i2c_msg *msgs,
136 int num)
137{
138 struct pmac_i2c_bus *bus = i2c_get_adapdata(adap);
139 int rc = 0;
140 int addrdir;
141
142 if (msgs->flags & I2C_M_TEN)
143 return -EINVAL;
144 addrdir = i2c_8bit_addr_from_msg(msgs);
145
146 rc = pmac_i2c_open(bus, 0);
147 if (rc) {
148 dev_err(&adap->dev, "Failed to open I2C, err %d\n", rc);
149 return rc;
150 }
151 rc = pmac_i2c_setmode(bus, pmac_i2c_mode_std);
152 if (rc) {
153 dev_err(&adap->dev, "Failed to set I2C mode %d, err %d\n",
154 pmac_i2c_mode_std, rc);
155 goto bail;
156 }
157 rc = pmac_i2c_xfer(bus, addrdir, 0, 0, msgs->buf, msgs->len);
158 if (rc < 0) {
159 if (rc == -ENXIO)
160 dev_dbg(&adap->dev, "I2C %s 0x%02x failed, err %d\n",
161 addrdir & 1 ? "read from" : "write to",
162 addrdir >> 1, rc);
163 else
164 dev_err(&adap->dev, "I2C %s 0x%02x failed, err %d\n",
165 addrdir & 1 ? "read from" : "write to",
166 addrdir >> 1, rc);
167 }
168 bail:
169 pmac_i2c_close(bus);
170 return rc < 0 ? rc : 1;
171}
172
173static u32 i2c_powermac_func(struct i2c_adapter * adapter)
174{
175 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
176 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
177 I2C_FUNC_SMBUS_BLOCK_DATA | I2C_FUNC_I2C;
178}
179
180/* For now, we only handle smbus */
181static const struct i2c_algorithm i2c_powermac_algorithm = {
182 .smbus_xfer = i2c_powermac_smbus_xfer,
183 .master_xfer = i2c_powermac_master_xfer,
184 .functionality = i2c_powermac_func,
185};
186
187static const struct i2c_adapter_quirks i2c_powermac_quirks = {
188 .max_num_msgs = 1,
189};
190
191static int i2c_powermac_remove(struct platform_device *dev)
192{
193 struct i2c_adapter *adapter = platform_get_drvdata(dev);
194
195 i2c_del_adapter(adapter);
196 memset(adapter, 0, sizeof(*adapter));
197
198 return 0;
199}
200
201static u32 i2c_powermac_get_addr(struct i2c_adapter *adap,
202 struct pmac_i2c_bus *bus,
203 struct device_node *node)
204{
205 u32 prop;
206 int ret;
207
208 /* First check for valid "reg" */
209 ret = of_property_read_u32(node, "reg", &prop);
210 if (ret == 0)
211 return (prop & 0xff) >> 1;
212
213 /* Then check old-style "i2c-address" */
214 ret = of_property_read_u32(node, "i2c-address", &prop);
215 if (ret == 0)
216 return (prop & 0xff) >> 1;
217
218 /* Now handle some devices with missing "reg" properties */
219 if (of_node_name_eq(node, "cereal"))
220 return 0x60;
221 else if (of_node_name_eq(node, "deq"))
222 return 0x34;
223
224 dev_warn(&adap->dev, "No i2c address for %pOF\n", node);
225
226 return 0xffffffff;
227}
228
229static void i2c_powermac_create_one(struct i2c_adapter *adap,
230 const char *type,
231 u32 addr)
232{
233 struct i2c_board_info info = {};
234 struct i2c_client *newdev;
235
236 strncpy(info.type, type, sizeof(info.type));
237 info.addr = addr;
238 newdev = i2c_new_client_device(adap, &info);
239 if (IS_ERR(newdev))
240 dev_err(&adap->dev,
241 "i2c-powermac: Failure to register missing %s\n",
242 type);
243}
244
245static void i2c_powermac_add_missing(struct i2c_adapter *adap,
246 struct pmac_i2c_bus *bus,
247 bool found_onyx)
248{
249 struct device_node *busnode = pmac_i2c_get_bus_node(bus);
250 int rc;
251
252 /* Check for the onyx audio codec */
253#define ONYX_REG_CONTROL 67
254 if (of_device_is_compatible(busnode, "k2-i2c") && !found_onyx) {
255 union i2c_smbus_data data;
256
257 rc = i2c_smbus_xfer(adap, 0x46, 0, I2C_SMBUS_READ,
258 ONYX_REG_CONTROL, I2C_SMBUS_BYTE_DATA,
259 &data);
260 if (rc >= 0)
261 i2c_powermac_create_one(adap, "MAC,pcm3052", 0x46);
262
263 rc = i2c_smbus_xfer(adap, 0x47, 0, I2C_SMBUS_READ,
264 ONYX_REG_CONTROL, I2C_SMBUS_BYTE_DATA,
265 &data);
266 if (rc >= 0)
267 i2c_powermac_create_one(adap, "MAC,pcm3052", 0x47);
268 }
269}
270
271static bool i2c_powermac_get_type(struct i2c_adapter *adap,
272 struct device_node *node,
273 u32 addr, char *type, int type_size)
274{
275 char tmp[16];
276
277 /*
278 * Note: we do _NOT_ want the standard i2c drivers to match with any of
279 * our powermac stuff unless they have been specifically modified to
280 * handle it on a case by case basis. For example, for thermal control,
281 * things like lm75 etc... shall match with their corresponding
282 * windfarm drivers, _NOT_ the generic ones, so we force a prefix of
283 * 'MAC', onto the modalias to make that happen
284 */
285
286 /* First try proper modalias */
287 if (of_modalias_node(node, tmp, sizeof(tmp)) >= 0) {
288 snprintf(type, type_size, "MAC,%s", tmp);
289 return true;
290 }
291
292 /* Now look for known workarounds */
293 if (of_node_name_eq(node, "deq")) {
294 /* Apple uses address 0x34 for TAS3001 and 0x35 for TAS3004 */
295 if (addr == 0x34) {
296 snprintf(type, type_size, "MAC,tas3001");
297 return true;
298 } else if (addr == 0x35) {
299 snprintf(type, type_size, "MAC,tas3004");
300 return true;
301 }
302 }
303
304 dev_err(&adap->dev, "i2c-powermac: modalias failure on %pOF\n", node);
305 return false;
306}
307
308static void i2c_powermac_register_devices(struct i2c_adapter *adap,
309 struct pmac_i2c_bus *bus)
310{
311 struct i2c_client *newdev;
312 struct device_node *node;
313 bool found_onyx = false;
314
315 /*
316 * In some cases we end up with the via-pmu node itself, in this
317 * case we skip this function completely as the device-tree will
318 * not contain anything useful.
319 */
320 if (of_node_name_eq(adap->dev.of_node, "via-pmu"))
321 return;
322
323 for_each_child_of_node(adap->dev.of_node, node) {
324 struct i2c_board_info info = {};
325 u32 addr;
326
327 /* Get address & channel */
328 addr = i2c_powermac_get_addr(adap, bus, node);
329 if (addr == 0xffffffff)
330 continue;
331
332 /* Multibus setup, check channel */
333 if (!pmac_i2c_match_adapter(node, adap))
334 continue;
335
336 dev_dbg(&adap->dev, "i2c-powermac: register %pOF\n", node);
337
338 /*
339 * Keep track of some device existence to handle
340 * workarounds later.
341 */
342 if (of_device_is_compatible(node, "pcm3052"))
343 found_onyx = true;
344
345 /* Make up a modalias */
346 if (!i2c_powermac_get_type(adap, node, addr,
347 info.type, sizeof(info.type))) {
348 continue;
349 }
350
351 /* Fill out the rest of the info structure */
352 info.addr = addr;
353 info.irq = irq_of_parse_and_map(node, 0);
354 info.of_node = of_node_get(node);
355
356 newdev = i2c_new_client_device(adap, &info);
357 if (IS_ERR(newdev)) {
358 dev_err(&adap->dev, "i2c-powermac: Failure to register"
359 " %pOF\n", node);
360 of_node_put(node);
361 /* We do not dispose of the interrupt mapping on
362 * purpose. It's not necessary (interrupt cannot be
363 * re-used) and somebody else might have grabbed it
364 * via direct DT lookup so let's not bother
365 */
366 continue;
367 }
368 }
369
370 /* Additional workarounds */
371 i2c_powermac_add_missing(adap, bus, found_onyx);
372}
373
374static int i2c_powermac_probe(struct platform_device *dev)
375{
376 struct pmac_i2c_bus *bus = dev_get_platdata(&dev->dev);
377 struct device_node *parent;
378 struct i2c_adapter *adapter;
379 int rc;
380
381 if (bus == NULL)
382 return -EINVAL;
383 adapter = pmac_i2c_get_adapter(bus);
384
385 /* Ok, now we need to make up a name for the interface that will
386 * match what we used to do in the past, that is basically the
387 * controller's parent device node for keywest. PMU didn't have a
388 * naming convention and SMU has a different one
389 */
390 switch(pmac_i2c_get_type(bus)) {
391 case pmac_i2c_bus_keywest:
392 parent = of_get_parent(pmac_i2c_get_controller(bus));
393 if (parent == NULL)
394 return -EINVAL;
395 snprintf(adapter->name, sizeof(adapter->name), "%pOFn %d",
396 parent,
397 pmac_i2c_get_channel(bus));
398 of_node_put(parent);
399 break;
400 case pmac_i2c_bus_pmu:
401 snprintf(adapter->name, sizeof(adapter->name), "pmu %d",
402 pmac_i2c_get_channel(bus));
403 break;
404 case pmac_i2c_bus_smu:
405 /* This is not what we used to do but I'm fixing drivers at
406 * the same time as this change
407 */
408 snprintf(adapter->name, sizeof(adapter->name), "smu %d",
409 pmac_i2c_get_channel(bus));
410 break;
411 default:
412 return -EINVAL;
413 }
414
415 platform_set_drvdata(dev, adapter);
416 adapter->algo = &i2c_powermac_algorithm;
417 adapter->quirks = &i2c_powermac_quirks;
418 i2c_set_adapdata(adapter, bus);
419 adapter->dev.parent = &dev->dev;
420
421 /* Clear of_node to skip automatic registration of i2c child nodes */
422 adapter->dev.of_node = NULL;
423 rc = i2c_add_adapter(adapter);
424 if (rc) {
425 printk(KERN_ERR "i2c-powermac: Adapter %s registration "
426 "failed\n", adapter->name);
427 memset(adapter, 0, sizeof(*adapter));
428 return rc;
429 }
430
431 printk(KERN_INFO "PowerMac i2c bus %s registered\n", adapter->name);
432
433 /* Use custom child registration due to Apple device-tree funkyness */
434 adapter->dev.of_node = dev->dev.of_node;
435 i2c_powermac_register_devices(adapter, bus);
436
437 return 0;
438}
439
440static struct platform_driver i2c_powermac_driver = {
441 .probe = i2c_powermac_probe,
442 .remove = i2c_powermac_remove,
443 .driver = {
444 .name = "i2c-powermac",
445 .bus = &platform_bus_type,
446 },
447};
448
449module_platform_driver(i2c_powermac_driver);
450
451MODULE_ALIAS("platform:i2c-powermac");
1/*
2 i2c Support for Apple SMU Controller
3
4 Copyright (c) 2005 Benjamin Herrenschmidt, IBM Corp.
5 <benh@kernel.crashing.org>
6
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.
11
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.
16
17*/
18
19#include <linux/module.h>
20#include <linux/kernel.h>
21#include <linux/types.h>
22#include <linux/i2c.h>
23#include <linux/device.h>
24#include <linux/platform_device.h>
25#include <linux/of_irq.h>
26#include <asm/prom.h>
27#include <asm/pmac_low_i2c.h>
28
29MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
30MODULE_DESCRIPTION("I2C driver for Apple PowerMac");
31MODULE_LICENSE("GPL");
32
33/*
34 * SMBUS-type transfer entrypoint
35 */
36static s32 i2c_powermac_smbus_xfer( struct i2c_adapter* adap,
37 u16 addr,
38 unsigned short flags,
39 char read_write,
40 u8 command,
41 int size,
42 union i2c_smbus_data* data)
43{
44 struct pmac_i2c_bus *bus = i2c_get_adapdata(adap);
45 int rc = 0;
46 int read = (read_write == I2C_SMBUS_READ);
47 int addrdir = (addr << 1) | read;
48 int mode, subsize, len;
49 u32 subaddr;
50 u8 *buf;
51 u8 local[2];
52
53 if (size == I2C_SMBUS_QUICK || size == I2C_SMBUS_BYTE) {
54 mode = pmac_i2c_mode_std;
55 subsize = 0;
56 subaddr = 0;
57 } else {
58 mode = read ? pmac_i2c_mode_combined : pmac_i2c_mode_stdsub;
59 subsize = 1;
60 subaddr = command;
61 }
62
63 switch (size) {
64 case I2C_SMBUS_QUICK:
65 buf = NULL;
66 len = 0;
67 break;
68 case I2C_SMBUS_BYTE:
69 case I2C_SMBUS_BYTE_DATA:
70 buf = &data->byte;
71 len = 1;
72 break;
73 case I2C_SMBUS_WORD_DATA:
74 if (!read) {
75 local[0] = data->word & 0xff;
76 local[1] = (data->word >> 8) & 0xff;
77 }
78 buf = local;
79 len = 2;
80 break;
81
82 /* Note that these are broken vs. the expected smbus API where
83 * on reads, the length is actually returned from the function,
84 * but I think the current API makes no sense and I don't want
85 * any driver that I haven't verified for correctness to go
86 * anywhere near a pmac i2c bus anyway ...
87 *
88 * I'm also not completely sure what kind of phases to do between
89 * the actual command and the data (what I am _supposed_ to do that
90 * is). For now, I assume writes are a single stream and reads have
91 * a repeat start/addr phase (but not stop in between)
92 */
93 case I2C_SMBUS_BLOCK_DATA:
94 buf = data->block;
95 len = data->block[0] + 1;
96 break;
97 case I2C_SMBUS_I2C_BLOCK_DATA:
98 buf = &data->block[1];
99 len = data->block[0];
100 break;
101
102 default:
103 return -EINVAL;
104 }
105
106 rc = pmac_i2c_open(bus, 0);
107 if (rc) {
108 dev_err(&adap->dev, "Failed to open I2C, err %d\n", rc);
109 return rc;
110 }
111
112 rc = pmac_i2c_setmode(bus, mode);
113 if (rc) {
114 dev_err(&adap->dev, "Failed to set I2C mode %d, err %d\n",
115 mode, rc);
116 goto bail;
117 }
118
119 rc = pmac_i2c_xfer(bus, addrdir, subsize, subaddr, buf, len);
120 if (rc) {
121 if (rc == -ENXIO)
122 dev_dbg(&adap->dev,
123 "I2C transfer at 0x%02x failed, size %d, "
124 "err %d\n", addrdir >> 1, size, rc);
125 else
126 dev_err(&adap->dev,
127 "I2C transfer at 0x%02x failed, size %d, "
128 "err %d\n", addrdir >> 1, size, rc);
129 goto bail;
130 }
131
132 if (size == I2C_SMBUS_WORD_DATA && read) {
133 data->word = ((u16)local[1]) << 8;
134 data->word |= local[0];
135 }
136
137 bail:
138 pmac_i2c_close(bus);
139 return rc;
140}
141
142/*
143 * Generic i2c master transfer entrypoint. This driver only support single
144 * messages (for "lame i2c" transfers). Anything else should use the smbus
145 * entry point
146 */
147static int i2c_powermac_master_xfer( struct i2c_adapter *adap,
148 struct i2c_msg *msgs,
149 int num)
150{
151 struct pmac_i2c_bus *bus = i2c_get_adapdata(adap);
152 int rc = 0;
153 int addrdir;
154
155 if (msgs->flags & I2C_M_TEN)
156 return -EINVAL;
157 addrdir = i2c_8bit_addr_from_msg(msgs);
158
159 rc = pmac_i2c_open(bus, 0);
160 if (rc) {
161 dev_err(&adap->dev, "Failed to open I2C, err %d\n", rc);
162 return rc;
163 }
164 rc = pmac_i2c_setmode(bus, pmac_i2c_mode_std);
165 if (rc) {
166 dev_err(&adap->dev, "Failed to set I2C mode %d, err %d\n",
167 pmac_i2c_mode_std, rc);
168 goto bail;
169 }
170 rc = pmac_i2c_xfer(bus, addrdir, 0, 0, msgs->buf, msgs->len);
171 if (rc < 0) {
172 if (rc == -ENXIO)
173 dev_dbg(&adap->dev, "I2C %s 0x%02x failed, err %d\n",
174 addrdir & 1 ? "read from" : "write to",
175 addrdir >> 1, rc);
176 else
177 dev_err(&adap->dev, "I2C %s 0x%02x failed, err %d\n",
178 addrdir & 1 ? "read from" : "write to",
179 addrdir >> 1, rc);
180 }
181 bail:
182 pmac_i2c_close(bus);
183 return rc < 0 ? rc : 1;
184}
185
186static u32 i2c_powermac_func(struct i2c_adapter * adapter)
187{
188 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
189 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
190 I2C_FUNC_SMBUS_BLOCK_DATA | I2C_FUNC_I2C;
191}
192
193/* For now, we only handle smbus */
194static const struct i2c_algorithm i2c_powermac_algorithm = {
195 .smbus_xfer = i2c_powermac_smbus_xfer,
196 .master_xfer = i2c_powermac_master_xfer,
197 .functionality = i2c_powermac_func,
198};
199
200static struct i2c_adapter_quirks i2c_powermac_quirks = {
201 .max_num_msgs = 1,
202};
203
204static int i2c_powermac_remove(struct platform_device *dev)
205{
206 struct i2c_adapter *adapter = platform_get_drvdata(dev);
207
208 i2c_del_adapter(adapter);
209 memset(adapter, 0, sizeof(*adapter));
210
211 return 0;
212}
213
214static u32 i2c_powermac_get_addr(struct i2c_adapter *adap,
215 struct pmac_i2c_bus *bus,
216 struct device_node *node)
217{
218 const __be32 *prop;
219 int len;
220
221 /* First check for valid "reg" */
222 prop = of_get_property(node, "reg", &len);
223 if (prop && (len >= sizeof(int)))
224 return (be32_to_cpup(prop) & 0xff) >> 1;
225
226 /* Then check old-style "i2c-address" */
227 prop = of_get_property(node, "i2c-address", &len);
228 if (prop && (len >= sizeof(int)))
229 return (be32_to_cpup(prop) & 0xff) >> 1;
230
231 /* Now handle some devices with missing "reg" properties */
232 if (!strcmp(node->name, "cereal"))
233 return 0x60;
234 else if (!strcmp(node->name, "deq"))
235 return 0x34;
236
237 dev_warn(&adap->dev, "No i2c address for %s\n", node->full_name);
238
239 return 0xffffffff;
240}
241
242static void i2c_powermac_create_one(struct i2c_adapter *adap,
243 const char *type,
244 u32 addr)
245{
246 struct i2c_board_info info = {};
247 struct i2c_client *newdev;
248
249 strncpy(info.type, type, sizeof(info.type));
250 info.addr = addr;
251 newdev = i2c_new_device(adap, &info);
252 if (!newdev)
253 dev_err(&adap->dev,
254 "i2c-powermac: Failure to register missing %s\n",
255 type);
256}
257
258static void i2c_powermac_add_missing(struct i2c_adapter *adap,
259 struct pmac_i2c_bus *bus,
260 bool found_onyx)
261{
262 struct device_node *busnode = pmac_i2c_get_bus_node(bus);
263 int rc;
264
265 /* Check for the onyx audio codec */
266#define ONYX_REG_CONTROL 67
267 if (of_device_is_compatible(busnode, "k2-i2c") && !found_onyx) {
268 union i2c_smbus_data data;
269
270 rc = i2c_smbus_xfer(adap, 0x46, 0, I2C_SMBUS_READ,
271 ONYX_REG_CONTROL, I2C_SMBUS_BYTE_DATA,
272 &data);
273 if (rc >= 0)
274 i2c_powermac_create_one(adap, "MAC,pcm3052", 0x46);
275
276 rc = i2c_smbus_xfer(adap, 0x47, 0, I2C_SMBUS_READ,
277 ONYX_REG_CONTROL, I2C_SMBUS_BYTE_DATA,
278 &data);
279 if (rc >= 0)
280 i2c_powermac_create_one(adap, "MAC,pcm3052", 0x47);
281 }
282}
283
284static bool i2c_powermac_get_type(struct i2c_adapter *adap,
285 struct device_node *node,
286 u32 addr, char *type, int type_size)
287{
288 char tmp[16];
289
290 /* Note: we to _NOT_ want the standard
291 * i2c drivers to match with any of our powermac stuff
292 * unless they have been specifically modified to handle
293 * it on a case by case basis. For example, for thermal
294 * control, things like lm75 etc... shall match with their
295 * corresponding windfarm drivers, _NOT_ the generic ones,
296 * so we force a prefix of AAPL, onto the modalias to
297 * make that happen
298 */
299
300 /* First try proper modalias */
301 if (of_modalias_node(node, tmp, sizeof(tmp)) >= 0) {
302 snprintf(type, type_size, "MAC,%s", tmp);
303 return true;
304 }
305
306 /* Now look for known workarounds */
307 if (!strcmp(node->name, "deq")) {
308 /* Apple uses address 0x34 for TAS3001 and 0x35 for TAS3004 */
309 if (addr == 0x34) {
310 snprintf(type, type_size, "MAC,tas3001");
311 return true;
312 } else if (addr == 0x35) {
313 snprintf(type, type_size, "MAC,tas3004");
314 return true;
315 }
316 }
317
318 dev_err(&adap->dev, "i2c-powermac: modalias failure"
319 " on %s\n", node->full_name);
320 return false;
321}
322
323static void i2c_powermac_register_devices(struct i2c_adapter *adap,
324 struct pmac_i2c_bus *bus)
325{
326 struct i2c_client *newdev;
327 struct device_node *node;
328 bool found_onyx = 0;
329
330 /*
331 * In some cases we end up with the via-pmu node itself, in this
332 * case we skip this function completely as the device-tree will
333 * not contain anything useful.
334 */
335 if (!strcmp(adap->dev.of_node->name, "via-pmu"))
336 return;
337
338 for_each_child_of_node(adap->dev.of_node, node) {
339 struct i2c_board_info info = {};
340 u32 addr;
341
342 /* Get address & channel */
343 addr = i2c_powermac_get_addr(adap, bus, node);
344 if (addr == 0xffffffff)
345 continue;
346
347 /* Multibus setup, check channel */
348 if (!pmac_i2c_match_adapter(node, adap))
349 continue;
350
351 dev_dbg(&adap->dev, "i2c-powermac: register %s\n",
352 node->full_name);
353
354 /*
355 * Keep track of some device existence to handle
356 * workarounds later.
357 */
358 if (of_device_is_compatible(node, "pcm3052"))
359 found_onyx = true;
360
361 /* Make up a modalias */
362 if (!i2c_powermac_get_type(adap, node, addr,
363 info.type, sizeof(info.type))) {
364 continue;
365 }
366
367 /* Fill out the rest of the info structure */
368 info.addr = addr;
369 info.irq = irq_of_parse_and_map(node, 0);
370 info.of_node = of_node_get(node);
371
372 newdev = i2c_new_device(adap, &info);
373 if (!newdev) {
374 dev_err(&adap->dev, "i2c-powermac: Failure to register"
375 " %s\n", node->full_name);
376 of_node_put(node);
377 /* We do not dispose of the interrupt mapping on
378 * purpose. It's not necessary (interrupt cannot be
379 * re-used) and somebody else might have grabbed it
380 * via direct DT lookup so let's not bother
381 */
382 continue;
383 }
384 }
385
386 /* Additional workarounds */
387 i2c_powermac_add_missing(adap, bus, found_onyx);
388}
389
390static int i2c_powermac_probe(struct platform_device *dev)
391{
392 struct pmac_i2c_bus *bus = dev_get_platdata(&dev->dev);
393 struct device_node *parent = NULL;
394 struct i2c_adapter *adapter;
395 const char *basename;
396 int rc;
397
398 if (bus == NULL)
399 return -EINVAL;
400 adapter = pmac_i2c_get_adapter(bus);
401
402 /* Ok, now we need to make up a name for the interface that will
403 * match what we used to do in the past, that is basically the
404 * controller's parent device node for keywest. PMU didn't have a
405 * naming convention and SMU has a different one
406 */
407 switch(pmac_i2c_get_type(bus)) {
408 case pmac_i2c_bus_keywest:
409 parent = of_get_parent(pmac_i2c_get_controller(bus));
410 if (parent == NULL)
411 return -EINVAL;
412 basename = parent->name;
413 break;
414 case pmac_i2c_bus_pmu:
415 basename = "pmu";
416 break;
417 case pmac_i2c_bus_smu:
418 /* This is not what we used to do but I'm fixing drivers at
419 * the same time as this change
420 */
421 basename = "smu";
422 break;
423 default:
424 return -EINVAL;
425 }
426 snprintf(adapter->name, sizeof(adapter->name), "%s %d", basename,
427 pmac_i2c_get_channel(bus));
428 of_node_put(parent);
429
430 platform_set_drvdata(dev, adapter);
431 adapter->algo = &i2c_powermac_algorithm;
432 adapter->quirks = &i2c_powermac_quirks;
433 i2c_set_adapdata(adapter, bus);
434 adapter->dev.parent = &dev->dev;
435
436 /* Clear of_node to skip automatic registration of i2c child nodes */
437 adapter->dev.of_node = NULL;
438 rc = i2c_add_adapter(adapter);
439 if (rc) {
440 printk(KERN_ERR "i2c-powermac: Adapter %s registration "
441 "failed\n", adapter->name);
442 memset(adapter, 0, sizeof(*adapter));
443 return rc;
444 }
445
446 printk(KERN_INFO "PowerMac i2c bus %s registered\n", adapter->name);
447
448 /* Use custom child registration due to Apple device-tree funkyness */
449 adapter->dev.of_node = dev->dev.of_node;
450 i2c_powermac_register_devices(adapter, bus);
451
452 return 0;
453}
454
455static struct platform_driver i2c_powermac_driver = {
456 .probe = i2c_powermac_probe,
457 .remove = i2c_powermac_remove,
458 .driver = {
459 .name = "i2c-powermac",
460 .bus = &platform_bus_type,
461 },
462};
463
464module_platform_driver(i2c_powermac_driver);
465
466MODULE_ALIAS("platform:i2c-powermac");