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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 void 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
199static u32 i2c_powermac_get_addr(struct i2c_adapter *adap,
200 struct pmac_i2c_bus *bus,
201 struct device_node *node)
202{
203 u32 prop;
204 int ret;
205
206 /* First check for valid "reg" */
207 ret = of_property_read_u32(node, "reg", &prop);
208 if (ret == 0)
209 return (prop & 0xff) >> 1;
210
211 /* Then check old-style "i2c-address" */
212 ret = of_property_read_u32(node, "i2c-address", &prop);
213 if (ret == 0)
214 return (prop & 0xff) >> 1;
215
216 /* Now handle some devices with missing "reg" properties */
217 if (of_node_name_eq(node, "cereal"))
218 return 0x60;
219 else if (of_node_name_eq(node, "deq"))
220 return 0x34;
221
222 dev_warn(&adap->dev, "No i2c address for %pOF\n", node);
223
224 return 0xffffffff;
225}
226
227static void i2c_powermac_create_one(struct i2c_adapter *adap,
228 const char *type,
229 u32 addr)
230{
231 struct i2c_board_info info = {};
232 struct i2c_client *newdev;
233
234 strscpy(info.type, type, sizeof(info.type));
235 info.addr = addr;
236 newdev = i2c_new_client_device(adap, &info);
237 if (IS_ERR(newdev))
238 dev_err(&adap->dev,
239 "i2c-powermac: Failure to register missing %s\n",
240 type);
241}
242
243static void i2c_powermac_add_missing(struct i2c_adapter *adap,
244 struct pmac_i2c_bus *bus,
245 bool found_onyx)
246{
247 struct device_node *busnode = pmac_i2c_get_bus_node(bus);
248 int rc;
249
250 /* Check for the onyx audio codec */
251#define ONYX_REG_CONTROL 67
252 if (of_device_is_compatible(busnode, "k2-i2c") && !found_onyx) {
253 union i2c_smbus_data data;
254
255 rc = i2c_smbus_xfer(adap, 0x46, 0, I2C_SMBUS_READ,
256 ONYX_REG_CONTROL, I2C_SMBUS_BYTE_DATA,
257 &data);
258 if (rc >= 0)
259 i2c_powermac_create_one(adap, "MAC,pcm3052", 0x46);
260
261 rc = i2c_smbus_xfer(adap, 0x47, 0, I2C_SMBUS_READ,
262 ONYX_REG_CONTROL, I2C_SMBUS_BYTE_DATA,
263 &data);
264 if (rc >= 0)
265 i2c_powermac_create_one(adap, "MAC,pcm3052", 0x47);
266 }
267}
268
269static bool i2c_powermac_get_type(struct i2c_adapter *adap,
270 struct device_node *node,
271 u32 addr, char *type, int type_size)
272{
273 char tmp[16];
274
275 /*
276 * Note: we do _NOT_ want the standard i2c drivers to match with any of
277 * our powermac stuff unless they have been specifically modified to
278 * handle it on a case by case basis. For example, for thermal control,
279 * things like lm75 etc... shall match with their corresponding
280 * windfarm drivers, _NOT_ the generic ones, so we force a prefix of
281 * 'MAC', onto the modalias to make that happen
282 */
283
284 /* First try proper modalias */
285 if (of_alias_from_compatible(node, tmp, sizeof(tmp)) >= 0) {
286 snprintf(type, type_size, "MAC,%s", tmp);
287 return true;
288 }
289
290 /* Now look for known workarounds */
291 if (of_node_name_eq(node, "deq")) {
292 /* Apple uses address 0x34 for TAS3001 and 0x35 for TAS3004 */
293 if (addr == 0x34) {
294 snprintf(type, type_size, "MAC,tas3001");
295 return true;
296 } else if (addr == 0x35) {
297 snprintf(type, type_size, "MAC,tas3004");
298 return true;
299 }
300 }
301
302 dev_err(&adap->dev, "i2c-powermac: modalias failure on %pOF\n", node);
303 return false;
304}
305
306static void i2c_powermac_register_devices(struct i2c_adapter *adap,
307 struct pmac_i2c_bus *bus)
308{
309 struct i2c_client *newdev;
310 struct device_node *node;
311 bool found_onyx = false;
312
313 /*
314 * In some cases we end up with the via-pmu node itself, in this
315 * case we skip this function completely as the device-tree will
316 * not contain anything useful.
317 */
318 if (of_node_name_eq(adap->dev.of_node, "via-pmu"))
319 return;
320
321 for_each_child_of_node(adap->dev.of_node, node) {
322 struct i2c_board_info info = {};
323 u32 addr;
324
325 /* Get address & channel */
326 addr = i2c_powermac_get_addr(adap, bus, node);
327 if (addr == 0xffffffff)
328 continue;
329
330 /* Multibus setup, check channel */
331 if (!pmac_i2c_match_adapter(node, adap))
332 continue;
333
334 dev_dbg(&adap->dev, "i2c-powermac: register %pOF\n", node);
335
336 /*
337 * Keep track of some device existence to handle
338 * workarounds later.
339 */
340 if (of_device_is_compatible(node, "pcm3052"))
341 found_onyx = true;
342
343 /* Make up a modalias */
344 if (!i2c_powermac_get_type(adap, node, addr,
345 info.type, sizeof(info.type))) {
346 continue;
347 }
348
349 /* Fill out the rest of the info structure */
350 info.addr = addr;
351 info.irq = irq_of_parse_and_map(node, 0);
352 info.of_node = of_node_get(node);
353
354 newdev = i2c_new_client_device(adap, &info);
355 if (IS_ERR(newdev)) {
356 dev_err(&adap->dev, "i2c-powermac: Failure to register"
357 " %pOF\n", node);
358 of_node_put(node);
359 /* We do not dispose of the interrupt mapping on
360 * purpose. It's not necessary (interrupt cannot be
361 * re-used) and somebody else might have grabbed it
362 * via direct DT lookup so let's not bother
363 */
364 continue;
365 }
366 }
367
368 /* Additional workarounds */
369 i2c_powermac_add_missing(adap, bus, found_onyx);
370}
371
372static int i2c_powermac_probe(struct platform_device *dev)
373{
374 struct pmac_i2c_bus *bus = dev_get_platdata(&dev->dev);
375 struct device_node *parent;
376 struct i2c_adapter *adapter;
377 int rc;
378
379 if (bus == NULL)
380 return -EINVAL;
381 adapter = pmac_i2c_get_adapter(bus);
382
383 /* Ok, now we need to make up a name for the interface that will
384 * match what we used to do in the past, that is basically the
385 * controller's parent device node for keywest. PMU didn't have a
386 * naming convention and SMU has a different one
387 */
388 switch(pmac_i2c_get_type(bus)) {
389 case pmac_i2c_bus_keywest:
390 parent = of_get_parent(pmac_i2c_get_controller(bus));
391 if (parent == NULL)
392 return -EINVAL;
393 snprintf(adapter->name, sizeof(adapter->name), "%pOFn %d",
394 parent,
395 pmac_i2c_get_channel(bus));
396 of_node_put(parent);
397 break;
398 case pmac_i2c_bus_pmu:
399 snprintf(adapter->name, sizeof(adapter->name), "pmu %d",
400 pmac_i2c_get_channel(bus));
401 break;
402 case pmac_i2c_bus_smu:
403 /* This is not what we used to do but I'm fixing drivers at
404 * the same time as this change
405 */
406 snprintf(adapter->name, sizeof(adapter->name), "smu %d",
407 pmac_i2c_get_channel(bus));
408 break;
409 default:
410 return -EINVAL;
411 }
412
413 platform_set_drvdata(dev, adapter);
414 adapter->algo = &i2c_powermac_algorithm;
415 adapter->quirks = &i2c_powermac_quirks;
416 i2c_set_adapdata(adapter, bus);
417 adapter->dev.parent = &dev->dev;
418
419 /* Clear of_node to skip automatic registration of i2c child nodes */
420 adapter->dev.of_node = NULL;
421 rc = i2c_add_adapter(adapter);
422 if (rc) {
423 printk(KERN_ERR "i2c-powermac: Adapter %s registration "
424 "failed\n", adapter->name);
425 memset(adapter, 0, sizeof(*adapter));
426 return rc;
427 }
428
429 printk(KERN_INFO "PowerMac i2c bus %s registered\n", adapter->name);
430
431 /* Use custom child registration due to Apple device-tree funkyness */
432 adapter->dev.of_node = dev->dev.of_node;
433 i2c_powermac_register_devices(adapter, bus);
434
435 return 0;
436}
437
438static struct platform_driver i2c_powermac_driver = {
439 .probe = i2c_powermac_probe,
440 .remove_new = i2c_powermac_remove,
441 .driver = {
442 .name = "i2c-powermac",
443 .bus = &platform_bus_type,
444 },
445};
446
447module_platform_driver(i2c_powermac_driver);
448
449MODULE_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 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.
20
21*/
22
23#include <linux/module.h>
24#include <linux/kernel.h>
25#include <linux/types.h>
26#include <linux/i2c.h>
27#include <linux/device.h>
28#include <linux/platform_device.h>
29#include <linux/of_irq.h>
30#include <asm/prom.h>
31#include <asm/pmac_low_i2c.h>
32
33MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
34MODULE_DESCRIPTION("I2C driver for Apple PowerMac");
35MODULE_LICENSE("GPL");
36
37/*
38 * SMBUS-type transfer entrypoint
39 */
40static s32 i2c_powermac_smbus_xfer( struct i2c_adapter* adap,
41 u16 addr,
42 unsigned short flags,
43 char read_write,
44 u8 command,
45 int size,
46 union i2c_smbus_data* data)
47{
48 struct pmac_i2c_bus *bus = i2c_get_adapdata(adap);
49 int rc = 0;
50 int read = (read_write == I2C_SMBUS_READ);
51 int addrdir = (addr << 1) | read;
52 int mode, subsize, len;
53 u32 subaddr;
54 u8 *buf;
55 u8 local[2];
56
57 if (size == I2C_SMBUS_QUICK || size == I2C_SMBUS_BYTE) {
58 mode = pmac_i2c_mode_std;
59 subsize = 0;
60 subaddr = 0;
61 } else {
62 mode = read ? pmac_i2c_mode_combined : pmac_i2c_mode_stdsub;
63 subsize = 1;
64 subaddr = command;
65 }
66
67 switch (size) {
68 case I2C_SMBUS_QUICK:
69 buf = NULL;
70 len = 0;
71 break;
72 case I2C_SMBUS_BYTE:
73 case I2C_SMBUS_BYTE_DATA:
74 buf = &data->byte;
75 len = 1;
76 break;
77 case I2C_SMBUS_WORD_DATA:
78 if (!read) {
79 local[0] = data->word & 0xff;
80 local[1] = (data->word >> 8) & 0xff;
81 }
82 buf = local;
83 len = 2;
84 break;
85
86 /* Note that these are broken vs. the expected smbus API where
87 * on reads, the length is actually returned from the function,
88 * but I think the current API makes no sense and I don't want
89 * any driver that I haven't verified for correctness to go
90 * anywhere near a pmac i2c bus anyway ...
91 *
92 * I'm also not completely sure what kind of phases to do between
93 * the actual command and the data (what I am _supposed_ to do that
94 * is). For now, I assume writes are a single stream and reads have
95 * a repeat start/addr phase (but not stop in between)
96 */
97 case I2C_SMBUS_BLOCK_DATA:
98 buf = data->block;
99 len = data->block[0] + 1;
100 break;
101 case I2C_SMBUS_I2C_BLOCK_DATA:
102 buf = &data->block[1];
103 len = data->block[0];
104 break;
105
106 default:
107 return -EINVAL;
108 }
109
110 rc = pmac_i2c_open(bus, 0);
111 if (rc) {
112 dev_err(&adap->dev, "Failed to open I2C, err %d\n", rc);
113 return rc;
114 }
115
116 rc = pmac_i2c_setmode(bus, mode);
117 if (rc) {
118 dev_err(&adap->dev, "Failed to set I2C mode %d, err %d\n",
119 mode, rc);
120 goto bail;
121 }
122
123 rc = pmac_i2c_xfer(bus, addrdir, subsize, subaddr, buf, len);
124 if (rc) {
125 if (rc == -ENXIO)
126 dev_dbg(&adap->dev,
127 "I2C transfer at 0x%02x failed, size %d, "
128 "err %d\n", addrdir >> 1, size, rc);
129 else
130 dev_err(&adap->dev,
131 "I2C transfer at 0x%02x failed, size %d, "
132 "err %d\n", addrdir >> 1, size, rc);
133 goto bail;
134 }
135
136 if (size == I2C_SMBUS_WORD_DATA && read) {
137 data->word = ((u16)local[1]) << 8;
138 data->word |= local[0];
139 }
140
141 bail:
142 pmac_i2c_close(bus);
143 return rc;
144}
145
146/*
147 * Generic i2c master transfer entrypoint. This driver only support single
148 * messages (for "lame i2c" transfers). Anything else should use the smbus
149 * entry point
150 */
151static int i2c_powermac_master_xfer( struct i2c_adapter *adap,
152 struct i2c_msg *msgs,
153 int num)
154{
155 struct pmac_i2c_bus *bus = i2c_get_adapdata(adap);
156 int rc = 0;
157 int read;
158 int addrdir;
159
160 if (num != 1) {
161 dev_err(&adap->dev,
162 "Multi-message I2C transactions not supported\n");
163 return -EOPNOTSUPP;
164 }
165
166 if (msgs->flags & I2C_M_TEN)
167 return -EINVAL;
168 read = (msgs->flags & I2C_M_RD) != 0;
169 addrdir = (msgs->addr << 1) | read;
170
171 rc = pmac_i2c_open(bus, 0);
172 if (rc) {
173 dev_err(&adap->dev, "Failed to open I2C, err %d\n", rc);
174 return rc;
175 }
176 rc = pmac_i2c_setmode(bus, pmac_i2c_mode_std);
177 if (rc) {
178 dev_err(&adap->dev, "Failed to set I2C mode %d, err %d\n",
179 pmac_i2c_mode_std, rc);
180 goto bail;
181 }
182 rc = pmac_i2c_xfer(bus, addrdir, 0, 0, msgs->buf, msgs->len);
183 if (rc < 0) {
184 if (rc == -ENXIO)
185 dev_dbg(&adap->dev, "I2C %s 0x%02x failed, err %d\n",
186 addrdir & 1 ? "read from" : "write to",
187 addrdir >> 1, rc);
188 else
189 dev_err(&adap->dev, "I2C %s 0x%02x failed, err %d\n",
190 addrdir & 1 ? "read from" : "write to",
191 addrdir >> 1, rc);
192 }
193 bail:
194 pmac_i2c_close(bus);
195 return rc < 0 ? rc : 1;
196}
197
198static u32 i2c_powermac_func(struct i2c_adapter * adapter)
199{
200 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
201 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
202 I2C_FUNC_SMBUS_BLOCK_DATA | I2C_FUNC_I2C;
203}
204
205/* For now, we only handle smbus */
206static const struct i2c_algorithm i2c_powermac_algorithm = {
207 .smbus_xfer = i2c_powermac_smbus_xfer,
208 .master_xfer = i2c_powermac_master_xfer,
209 .functionality = i2c_powermac_func,
210};
211
212
213static int i2c_powermac_remove(struct platform_device *dev)
214{
215 struct i2c_adapter *adapter = platform_get_drvdata(dev);
216
217 i2c_del_adapter(adapter);
218 memset(adapter, 0, sizeof(*adapter));
219
220 return 0;
221}
222
223static u32 i2c_powermac_get_addr(struct i2c_adapter *adap,
224 struct pmac_i2c_bus *bus,
225 struct device_node *node)
226{
227 const __be32 *prop;
228 int len;
229
230 /* First check for valid "reg" */
231 prop = of_get_property(node, "reg", &len);
232 if (prop && (len >= sizeof(int)))
233 return (be32_to_cpup(prop) & 0xff) >> 1;
234
235 /* Then check old-style "i2c-address" */
236 prop = of_get_property(node, "i2c-address", &len);
237 if (prop && (len >= sizeof(int)))
238 return (be32_to_cpup(prop) & 0xff) >> 1;
239
240 /* Now handle some devices with missing "reg" properties */
241 if (!strcmp(node->name, "cereal"))
242 return 0x60;
243 else if (!strcmp(node->name, "deq"))
244 return 0x34;
245
246 dev_warn(&adap->dev, "No i2c address for %s\n", node->full_name);
247
248 return 0xffffffff;
249}
250
251static void i2c_powermac_create_one(struct i2c_adapter *adap,
252 const char *type,
253 u32 addr)
254{
255 struct i2c_board_info info = {};
256 struct i2c_client *newdev;
257
258 strncpy(info.type, type, sizeof(info.type));
259 info.addr = addr;
260 newdev = i2c_new_device(adap, &info);
261 if (!newdev)
262 dev_err(&adap->dev,
263 "i2c-powermac: Failure to register missing %s\n",
264 type);
265}
266
267static void i2c_powermac_add_missing(struct i2c_adapter *adap,
268 struct pmac_i2c_bus *bus,
269 bool found_onyx)
270{
271 struct device_node *busnode = pmac_i2c_get_bus_node(bus);
272 int rc;
273
274 /* Check for the onyx audio codec */
275#define ONYX_REG_CONTROL 67
276 if (of_device_is_compatible(busnode, "k2-i2c") && !found_onyx) {
277 union i2c_smbus_data data;
278
279 rc = i2c_smbus_xfer(adap, 0x46, 0, I2C_SMBUS_READ,
280 ONYX_REG_CONTROL, I2C_SMBUS_BYTE_DATA,
281 &data);
282 if (rc >= 0)
283 i2c_powermac_create_one(adap, "MAC,pcm3052", 0x46);
284
285 rc = i2c_smbus_xfer(adap, 0x47, 0, I2C_SMBUS_READ,
286 ONYX_REG_CONTROL, I2C_SMBUS_BYTE_DATA,
287 &data);
288 if (rc >= 0)
289 i2c_powermac_create_one(adap, "MAC,pcm3052", 0x47);
290 }
291}
292
293static bool i2c_powermac_get_type(struct i2c_adapter *adap,
294 struct device_node *node,
295 u32 addr, char *type, int type_size)
296{
297 char tmp[16];
298
299 /* Note: we to _NOT_ want the standard
300 * i2c drivers to match with any of our powermac stuff
301 * unless they have been specifically modified to handle
302 * it on a case by case basis. For example, for thermal
303 * control, things like lm75 etc... shall match with their
304 * corresponding windfarm drivers, _NOT_ the generic ones,
305 * so we force a prefix of AAPL, onto the modalias to
306 * make that happen
307 */
308
309 /* First try proper modalias */
310 if (of_modalias_node(node, tmp, sizeof(tmp)) >= 0) {
311 snprintf(type, type_size, "MAC,%s", tmp);
312 return true;
313 }
314
315 /* Now look for known workarounds */
316 if (!strcmp(node->name, "deq")) {
317 /* Apple uses address 0x34 for TAS3001 and 0x35 for TAS3004 */
318 if (addr == 0x34) {
319 snprintf(type, type_size, "MAC,tas3001");
320 return true;
321 } else if (addr == 0x35) {
322 snprintf(type, type_size, "MAC,tas3004");
323 return true;
324 }
325 }
326
327 dev_err(&adap->dev, "i2c-powermac: modalias failure"
328 " on %s\n", node->full_name);
329 return false;
330}
331
332static void i2c_powermac_register_devices(struct i2c_adapter *adap,
333 struct pmac_i2c_bus *bus)
334{
335 struct i2c_client *newdev;
336 struct device_node *node;
337 bool found_onyx = 0;
338
339 /*
340 * In some cases we end up with the via-pmu node itself, in this
341 * case we skip this function completely as the device-tree will
342 * not contain anything useful.
343 */
344 if (!strcmp(adap->dev.of_node->name, "via-pmu"))
345 return;
346
347 for_each_child_of_node(adap->dev.of_node, node) {
348 struct i2c_board_info info = {};
349 u32 addr;
350
351 /* Get address & channel */
352 addr = i2c_powermac_get_addr(adap, bus, node);
353 if (addr == 0xffffffff)
354 continue;
355
356 /* Multibus setup, check channel */
357 if (!pmac_i2c_match_adapter(node, adap))
358 continue;
359
360 dev_dbg(&adap->dev, "i2c-powermac: register %s\n",
361 node->full_name);
362
363 /*
364 * Keep track of some device existence to handle
365 * workarounds later.
366 */
367 if (of_device_is_compatible(node, "pcm3052"))
368 found_onyx = true;
369
370 /* Make up a modalias */
371 if (!i2c_powermac_get_type(adap, node, addr,
372 info.type, sizeof(info.type))) {
373 continue;
374 }
375
376 /* Fill out the rest of the info structure */
377 info.addr = addr;
378 info.irq = irq_of_parse_and_map(node, 0);
379 info.of_node = of_node_get(node);
380
381 newdev = i2c_new_device(adap, &info);
382 if (!newdev) {
383 dev_err(&adap->dev, "i2c-powermac: Failure to register"
384 " %s\n", node->full_name);
385 of_node_put(node);
386 /* We do not dispose of the interrupt mapping on
387 * purpose. It's not necessary (interrupt cannot be
388 * re-used) and somebody else might have grabbed it
389 * via direct DT lookup so let's not bother
390 */
391 continue;
392 }
393 }
394
395 /* Additional workarounds */
396 i2c_powermac_add_missing(adap, bus, found_onyx);
397}
398
399static int i2c_powermac_probe(struct platform_device *dev)
400{
401 struct pmac_i2c_bus *bus = dev_get_platdata(&dev->dev);
402 struct device_node *parent = NULL;
403 struct i2c_adapter *adapter;
404 const char *basename;
405 int rc;
406
407 if (bus == NULL)
408 return -EINVAL;
409 adapter = pmac_i2c_get_adapter(bus);
410
411 /* Ok, now we need to make up a name for the interface that will
412 * match what we used to do in the past, that is basically the
413 * controller's parent device node for keywest. PMU didn't have a
414 * naming convention and SMU has a different one
415 */
416 switch(pmac_i2c_get_type(bus)) {
417 case pmac_i2c_bus_keywest:
418 parent = of_get_parent(pmac_i2c_get_controller(bus));
419 if (parent == NULL)
420 return -EINVAL;
421 basename = parent->name;
422 break;
423 case pmac_i2c_bus_pmu:
424 basename = "pmu";
425 break;
426 case pmac_i2c_bus_smu:
427 /* This is not what we used to do but I'm fixing drivers at
428 * the same time as this change
429 */
430 basename = "smu";
431 break;
432 default:
433 return -EINVAL;
434 }
435 snprintf(adapter->name, sizeof(adapter->name), "%s %d", basename,
436 pmac_i2c_get_channel(bus));
437 of_node_put(parent);
438
439 platform_set_drvdata(dev, adapter);
440 adapter->algo = &i2c_powermac_algorithm;
441 i2c_set_adapdata(adapter, bus);
442 adapter->dev.parent = &dev->dev;
443
444 /* Clear of_node to skip automatic registration of i2c child nodes */
445 adapter->dev.of_node = NULL;
446 rc = i2c_add_adapter(adapter);
447 if (rc) {
448 printk(KERN_ERR "i2c-powermac: Adapter %s registration "
449 "failed\n", adapter->name);
450 memset(adapter, 0, sizeof(*adapter));
451 return rc;
452 }
453
454 printk(KERN_INFO "PowerMac i2c bus %s registered\n", adapter->name);
455
456 /* Use custom child registration due to Apple device-tree funkyness */
457 adapter->dev.of_node = dev->dev.of_node;
458 i2c_powermac_register_devices(adapter, bus);
459
460 return 0;
461}
462
463static struct platform_driver i2c_powermac_driver = {
464 .probe = i2c_powermac_probe,
465 .remove = i2c_powermac_remove,
466 .driver = {
467 .name = "i2c-powermac",
468 .bus = &platform_bus_type,
469 },
470};
471
472module_platform_driver(i2c_powermac_driver);
473
474MODULE_ALIAS("platform:i2c-powermac");