Commit | Line | Data |
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97fb5e8d | 1 | // SPDX-License-Identifier: GPL-2.0-only |
0b9641f5 GA |
2 | /* |
3 | * Copyright (c) 2012-2015, The Linux Foundation. All rights reserved. | |
5a86bf34 KH |
4 | */ |
5 | #include <linux/kernel.h> | |
6 | #include <linux/errno.h> | |
7 | #include <linux/idr.h> | |
8 | #include <linux/slab.h> | |
9 | #include <linux/module.h> | |
10 | #include <linux/of.h> | |
11 | #include <linux/of_device.h> | |
12 | #include <linux/platform_device.h> | |
13 | #include <linux/spmi.h> | |
5a86bf34 KH |
14 | #include <linux/pm_runtime.h> |
15 | ||
16 | #include <dt-bindings/spmi/spmi.h> | |
a9fce374 AG |
17 | #define CREATE_TRACE_POINTS |
18 | #include <trace/events/spmi.h> | |
5a86bf34 | 19 | |
47f55b74 | 20 | static bool is_registered; |
5a86bf34 KH |
21 | static DEFINE_IDA(ctrl_ida); |
22 | ||
23 | static void spmi_dev_release(struct device *dev) | |
24 | { | |
25 | struct spmi_device *sdev = to_spmi_device(dev); | |
0be0a733 | 26 | |
5a86bf34 KH |
27 | kfree(sdev); |
28 | } | |
29 | ||
30 | static const struct device_type spmi_dev_type = { | |
31 | .release = spmi_dev_release, | |
32 | }; | |
33 | ||
34 | static void spmi_ctrl_release(struct device *dev) | |
35 | { | |
36 | struct spmi_controller *ctrl = to_spmi_controller(dev); | |
0be0a733 | 37 | |
9357fc3b | 38 | ida_free(&ctrl_ida, ctrl->nr); |
5a86bf34 KH |
39 | kfree(ctrl); |
40 | } | |
41 | ||
42 | static const struct device_type spmi_ctrl_type = { | |
43 | .release = spmi_ctrl_release, | |
44 | }; | |
45 | ||
5a86bf34 KH |
46 | static int spmi_device_match(struct device *dev, struct device_driver *drv) |
47 | { | |
48 | if (of_driver_match_device(dev, drv)) | |
49 | return 1; | |
50 | ||
51 | if (drv->name) | |
52 | return strncmp(dev_name(dev), drv->name, | |
53 | SPMI_NAME_SIZE) == 0; | |
54 | ||
55 | return 0; | |
56 | } | |
57 | ||
58 | /** | |
59 | * spmi_device_add() - add a device previously constructed via spmi_device_alloc() | |
60 | * @sdev: spmi_device to be added | |
61 | */ | |
62 | int spmi_device_add(struct spmi_device *sdev) | |
63 | { | |
64 | struct spmi_controller *ctrl = sdev->ctrl; | |
65 | int err; | |
66 | ||
67 | dev_set_name(&sdev->dev, "%d-%02x", ctrl->nr, sdev->usid); | |
68 | ||
69 | err = device_add(&sdev->dev); | |
70 | if (err < 0) { | |
71 | dev_err(&sdev->dev, "Can't add %s, status %d\n", | |
72 | dev_name(&sdev->dev), err); | |
73 | goto err_device_add; | |
74 | } | |
75 | ||
76 | dev_dbg(&sdev->dev, "device %s registered\n", dev_name(&sdev->dev)); | |
77 | ||
78 | err_device_add: | |
79 | return err; | |
80 | } | |
81 | EXPORT_SYMBOL_GPL(spmi_device_add); | |
82 | ||
83 | /** | |
84 | * spmi_device_remove(): remove an SPMI device | |
85 | * @sdev: spmi_device to be removed | |
86 | */ | |
87 | void spmi_device_remove(struct spmi_device *sdev) | |
88 | { | |
89 | device_unregister(&sdev->dev); | |
90 | } | |
91 | EXPORT_SYMBOL_GPL(spmi_device_remove); | |
92 | ||
93 | static inline int | |
94 | spmi_cmd(struct spmi_controller *ctrl, u8 opcode, u8 sid) | |
95 | { | |
a9fce374 AG |
96 | int ret; |
97 | ||
5a86bf34 KH |
98 | if (!ctrl || !ctrl->cmd || ctrl->dev.type != &spmi_ctrl_type) |
99 | return -EINVAL; | |
100 | ||
a9fce374 AG |
101 | ret = ctrl->cmd(ctrl, opcode, sid); |
102 | trace_spmi_cmd(opcode, sid, ret); | |
103 | return ret; | |
5a86bf34 KH |
104 | } |
105 | ||
106 | static inline int spmi_read_cmd(struct spmi_controller *ctrl, u8 opcode, | |
107 | u8 sid, u16 addr, u8 *buf, size_t len) | |
108 | { | |
a9fce374 AG |
109 | int ret; |
110 | ||
5a86bf34 KH |
111 | if (!ctrl || !ctrl->read_cmd || ctrl->dev.type != &spmi_ctrl_type) |
112 | return -EINVAL; | |
113 | ||
a9fce374 AG |
114 | trace_spmi_read_begin(opcode, sid, addr); |
115 | ret = ctrl->read_cmd(ctrl, opcode, sid, addr, buf, len); | |
116 | trace_spmi_read_end(opcode, sid, addr, ret, len, buf); | |
117 | return ret; | |
5a86bf34 KH |
118 | } |
119 | ||
120 | static inline int spmi_write_cmd(struct spmi_controller *ctrl, u8 opcode, | |
121 | u8 sid, u16 addr, const u8 *buf, size_t len) | |
122 | { | |
a9fce374 AG |
123 | int ret; |
124 | ||
5a86bf34 KH |
125 | if (!ctrl || !ctrl->write_cmd || ctrl->dev.type != &spmi_ctrl_type) |
126 | return -EINVAL; | |
127 | ||
a9fce374 AG |
128 | trace_spmi_write_begin(opcode, sid, addr, len, buf); |
129 | ret = ctrl->write_cmd(ctrl, opcode, sid, addr, buf, len); | |
130 | trace_spmi_write_end(opcode, sid, addr, ret); | |
131 | return ret; | |
5a86bf34 KH |
132 | } |
133 | ||
134 | /** | |
135 | * spmi_register_read() - register read | |
136 | * @sdev: SPMI device. | |
137 | * @addr: slave register address (5-bit address). | |
138 | * @buf: buffer to be populated with data from the Slave. | |
139 | * | |
140 | * Reads 1 byte of data from a Slave device register. | |
141 | */ | |
142 | int spmi_register_read(struct spmi_device *sdev, u8 addr, u8 *buf) | |
143 | { | |
144 | /* 5-bit register address */ | |
145 | if (addr > 0x1F) | |
146 | return -EINVAL; | |
147 | ||
148 | return spmi_read_cmd(sdev->ctrl, SPMI_CMD_READ, sdev->usid, addr, | |
149 | buf, 1); | |
150 | } | |
151 | EXPORT_SYMBOL_GPL(spmi_register_read); | |
152 | ||
153 | /** | |
154 | * spmi_ext_register_read() - extended register read | |
155 | * @sdev: SPMI device. | |
156 | * @addr: slave register address (8-bit address). | |
157 | * @buf: buffer to be populated with data from the Slave. | |
158 | * @len: the request number of bytes to read (up to 16 bytes). | |
159 | * | |
160 | * Reads up to 16 bytes of data from the extended register space on a | |
161 | * Slave device. | |
162 | */ | |
163 | int spmi_ext_register_read(struct spmi_device *sdev, u8 addr, u8 *buf, | |
164 | size_t len) | |
165 | { | |
166 | /* 8-bit register address, up to 16 bytes */ | |
167 | if (len == 0 || len > 16) | |
168 | return -EINVAL; | |
169 | ||
170 | return spmi_read_cmd(sdev->ctrl, SPMI_CMD_EXT_READ, sdev->usid, addr, | |
171 | buf, len); | |
172 | } | |
173 | EXPORT_SYMBOL_GPL(spmi_ext_register_read); | |
174 | ||
175 | /** | |
176 | * spmi_ext_register_readl() - extended register read long | |
177 | * @sdev: SPMI device. | |
178 | * @addr: slave register address (16-bit address). | |
179 | * @buf: buffer to be populated with data from the Slave. | |
180 | * @len: the request number of bytes to read (up to 8 bytes). | |
181 | * | |
182 | * Reads up to 8 bytes of data from the extended register space on a | |
183 | * Slave device using 16-bit address. | |
184 | */ | |
185 | int spmi_ext_register_readl(struct spmi_device *sdev, u16 addr, u8 *buf, | |
186 | size_t len) | |
187 | { | |
188 | /* 16-bit register address, up to 8 bytes */ | |
189 | if (len == 0 || len > 8) | |
190 | return -EINVAL; | |
191 | ||
192 | return spmi_read_cmd(sdev->ctrl, SPMI_CMD_EXT_READL, sdev->usid, addr, | |
193 | buf, len); | |
194 | } | |
195 | EXPORT_SYMBOL_GPL(spmi_ext_register_readl); | |
196 | ||
197 | /** | |
198 | * spmi_register_write() - register write | |
199 | * @sdev: SPMI device | |
200 | * @addr: slave register address (5-bit address). | |
201 | * @data: buffer containing the data to be transferred to the Slave. | |
202 | * | |
203 | * Writes 1 byte of data to a Slave device register. | |
204 | */ | |
205 | int spmi_register_write(struct spmi_device *sdev, u8 addr, u8 data) | |
206 | { | |
207 | /* 5-bit register address */ | |
208 | if (addr > 0x1F) | |
209 | return -EINVAL; | |
210 | ||
211 | return spmi_write_cmd(sdev->ctrl, SPMI_CMD_WRITE, sdev->usid, addr, | |
212 | &data, 1); | |
213 | } | |
214 | EXPORT_SYMBOL_GPL(spmi_register_write); | |
215 | ||
216 | /** | |
217 | * spmi_register_zero_write() - register zero write | |
218 | * @sdev: SPMI device. | |
219 | * @data: the data to be written to register 0 (7-bits). | |
220 | * | |
221 | * Writes data to register 0 of the Slave device. | |
222 | */ | |
223 | int spmi_register_zero_write(struct spmi_device *sdev, u8 data) | |
224 | { | |
225 | return spmi_write_cmd(sdev->ctrl, SPMI_CMD_ZERO_WRITE, sdev->usid, 0, | |
226 | &data, 1); | |
227 | } | |
228 | EXPORT_SYMBOL_GPL(spmi_register_zero_write); | |
229 | ||
230 | /** | |
231 | * spmi_ext_register_write() - extended register write | |
232 | * @sdev: SPMI device. | |
233 | * @addr: slave register address (8-bit address). | |
234 | * @buf: buffer containing the data to be transferred to the Slave. | |
235 | * @len: the request number of bytes to read (up to 16 bytes). | |
236 | * | |
237 | * Writes up to 16 bytes of data to the extended register space of a | |
238 | * Slave device. | |
239 | */ | |
240 | int spmi_ext_register_write(struct spmi_device *sdev, u8 addr, const u8 *buf, | |
241 | size_t len) | |
242 | { | |
243 | /* 8-bit register address, up to 16 bytes */ | |
244 | if (len == 0 || len > 16) | |
245 | return -EINVAL; | |
246 | ||
247 | return spmi_write_cmd(sdev->ctrl, SPMI_CMD_EXT_WRITE, sdev->usid, addr, | |
248 | buf, len); | |
249 | } | |
250 | EXPORT_SYMBOL_GPL(spmi_ext_register_write); | |
251 | ||
252 | /** | |
253 | * spmi_ext_register_writel() - extended register write long | |
254 | * @sdev: SPMI device. | |
255 | * @addr: slave register address (16-bit address). | |
256 | * @buf: buffer containing the data to be transferred to the Slave. | |
257 | * @len: the request number of bytes to read (up to 8 bytes). | |
258 | * | |
259 | * Writes up to 8 bytes of data to the extended register space of a | |
260 | * Slave device using 16-bit address. | |
261 | */ | |
262 | int spmi_ext_register_writel(struct spmi_device *sdev, u16 addr, const u8 *buf, | |
263 | size_t len) | |
264 | { | |
265 | /* 4-bit Slave Identifier, 16-bit register address, up to 8 bytes */ | |
266 | if (len == 0 || len > 8) | |
267 | return -EINVAL; | |
268 | ||
269 | return spmi_write_cmd(sdev->ctrl, SPMI_CMD_EXT_WRITEL, sdev->usid, | |
270 | addr, buf, len); | |
271 | } | |
272 | EXPORT_SYMBOL_GPL(spmi_ext_register_writel); | |
273 | ||
274 | /** | |
275 | * spmi_command_reset() - sends RESET command to the specified slave | |
276 | * @sdev: SPMI device. | |
277 | * | |
278 | * The Reset command initializes the Slave and forces all registers to | |
279 | * their reset values. The Slave shall enter the STARTUP state after | |
280 | * receiving a Reset command. | |
281 | */ | |
282 | int spmi_command_reset(struct spmi_device *sdev) | |
283 | { | |
284 | return spmi_cmd(sdev->ctrl, SPMI_CMD_RESET, sdev->usid); | |
285 | } | |
286 | EXPORT_SYMBOL_GPL(spmi_command_reset); | |
287 | ||
288 | /** | |
289 | * spmi_command_sleep() - sends SLEEP command to the specified SPMI device | |
290 | * @sdev: SPMI device. | |
291 | * | |
292 | * The Sleep command causes the Slave to enter the user defined SLEEP state. | |
293 | */ | |
294 | int spmi_command_sleep(struct spmi_device *sdev) | |
295 | { | |
296 | return spmi_cmd(sdev->ctrl, SPMI_CMD_SLEEP, sdev->usid); | |
297 | } | |
298 | EXPORT_SYMBOL_GPL(spmi_command_sleep); | |
299 | ||
300 | /** | |
301 | * spmi_command_wakeup() - sends WAKEUP command to the specified SPMI device | |
302 | * @sdev: SPMI device. | |
303 | * | |
304 | * The Wakeup command causes the Slave to move from the SLEEP state to | |
305 | * the ACTIVE state. | |
306 | */ | |
307 | int spmi_command_wakeup(struct spmi_device *sdev) | |
308 | { | |
309 | return spmi_cmd(sdev->ctrl, SPMI_CMD_WAKEUP, sdev->usid); | |
310 | } | |
311 | EXPORT_SYMBOL_GPL(spmi_command_wakeup); | |
312 | ||
313 | /** | |
314 | * spmi_command_shutdown() - sends SHUTDOWN command to the specified SPMI device | |
315 | * @sdev: SPMI device. | |
316 | * | |
317 | * The Shutdown command causes the Slave to enter the SHUTDOWN state. | |
318 | */ | |
319 | int spmi_command_shutdown(struct spmi_device *sdev) | |
320 | { | |
321 | return spmi_cmd(sdev->ctrl, SPMI_CMD_SHUTDOWN, sdev->usid); | |
322 | } | |
323 | EXPORT_SYMBOL_GPL(spmi_command_shutdown); | |
324 | ||
325 | static int spmi_drv_probe(struct device *dev) | |
326 | { | |
327 | const struct spmi_driver *sdrv = to_spmi_driver(dev->driver); | |
328 | struct spmi_device *sdev = to_spmi_device(dev); | |
329 | int err; | |
330 | ||
5a86bf34 KH |
331 | pm_runtime_get_noresume(dev); |
332 | pm_runtime_set_active(dev); | |
333 | pm_runtime_enable(dev); | |
334 | ||
335 | err = sdrv->probe(sdev); | |
336 | if (err) | |
337 | goto fail_probe; | |
338 | ||
339 | return 0; | |
340 | ||
341 | fail_probe: | |
342 | pm_runtime_disable(dev); | |
343 | pm_runtime_set_suspended(dev); | |
344 | pm_runtime_put_noidle(dev); | |
5a86bf34 KH |
345 | return err; |
346 | } | |
347 | ||
fc7a6209 | 348 | static void spmi_drv_remove(struct device *dev) |
5a86bf34 KH |
349 | { |
350 | const struct spmi_driver *sdrv = to_spmi_driver(dev->driver); | |
351 | ||
352 | pm_runtime_get_sync(dev); | |
b56eef3e JP |
353 | if (sdrv->remove) |
354 | sdrv->remove(to_spmi_device(dev)); | |
5a86bf34 KH |
355 | pm_runtime_put_noidle(dev); |
356 | ||
357 | pm_runtime_disable(dev); | |
358 | pm_runtime_set_suspended(dev); | |
359 | pm_runtime_put_noidle(dev); | |
5a86bf34 KH |
360 | } |
361 | ||
d40c2d4e HHW |
362 | static void spmi_drv_shutdown(struct device *dev) |
363 | { | |
364 | const struct spmi_driver *sdrv = to_spmi_driver(dev->driver); | |
365 | ||
366 | if (sdrv && sdrv->shutdown) | |
367 | sdrv->shutdown(to_spmi_device(dev)); | |
368 | } | |
369 | ||
2a81ada3 | 370 | static int spmi_drv_uevent(const struct device *dev, struct kobj_uevent_env *env) |
d50daa2a BA |
371 | { |
372 | int ret; | |
373 | ||
374 | ret = of_device_uevent_modalias(dev, env); | |
375 | if (ret != -ENODEV) | |
376 | return ret; | |
377 | ||
378 | return 0; | |
379 | } | |
380 | ||
5a86bf34 KH |
381 | static struct bus_type spmi_bus_type = { |
382 | .name = "spmi", | |
383 | .match = spmi_device_match, | |
5a86bf34 KH |
384 | .probe = spmi_drv_probe, |
385 | .remove = spmi_drv_remove, | |
d40c2d4e | 386 | .shutdown = spmi_drv_shutdown, |
d50daa2a | 387 | .uevent = spmi_drv_uevent, |
5a86bf34 KH |
388 | }; |
389 | ||
9a2139c2 CC |
390 | /** |
391 | * spmi_device_from_of() - get the associated SPMI device from a device node | |
392 | * | |
393 | * @np: device node | |
394 | * | |
395 | * Returns the struct spmi_device associated with a device node or NULL. | |
396 | */ | |
397 | struct spmi_device *spmi_device_from_of(struct device_node *np) | |
398 | { | |
399 | struct device *dev = bus_find_device_by_of_node(&spmi_bus_type, np); | |
400 | ||
401 | if (dev) | |
402 | return to_spmi_device(dev); | |
403 | return NULL; | |
404 | } | |
405 | EXPORT_SYMBOL_GPL(spmi_device_from_of); | |
406 | ||
5a86bf34 | 407 | /** |
80c606a8 | 408 | * spmi_device_alloc() - Allocate a new SPMI device |
5a86bf34 KH |
409 | * @ctrl: associated controller |
410 | * | |
411 | * Caller is responsible for either calling spmi_device_add() to add the | |
412 | * newly allocated controller, or calling spmi_device_put() to discard it. | |
413 | */ | |
414 | struct spmi_device *spmi_device_alloc(struct spmi_controller *ctrl) | |
415 | { | |
416 | struct spmi_device *sdev; | |
417 | ||
418 | sdev = kzalloc(sizeof(*sdev), GFP_KERNEL); | |
419 | if (!sdev) | |
420 | return NULL; | |
421 | ||
422 | sdev->ctrl = ctrl; | |
423 | device_initialize(&sdev->dev); | |
424 | sdev->dev.parent = &ctrl->dev; | |
425 | sdev->dev.bus = &spmi_bus_type; | |
426 | sdev->dev.type = &spmi_dev_type; | |
427 | return sdev; | |
428 | } | |
429 | EXPORT_SYMBOL_GPL(spmi_device_alloc); | |
430 | ||
431 | /** | |
432 | * spmi_controller_alloc() - Allocate a new SPMI controller | |
433 | * @parent: parent device | |
434 | * @size: size of private data | |
435 | * | |
436 | * Caller is responsible for either calling spmi_controller_add() to add the | |
437 | * newly allocated controller, or calling spmi_controller_put() to discard it. | |
438 | * The allocated private data region may be accessed via | |
439 | * spmi_controller_get_drvdata() | |
440 | */ | |
441 | struct spmi_controller *spmi_controller_alloc(struct device *parent, | |
442 | size_t size) | |
443 | { | |
444 | struct spmi_controller *ctrl; | |
445 | int id; | |
446 | ||
447 | if (WARN_ON(!parent)) | |
448 | return NULL; | |
449 | ||
450 | ctrl = kzalloc(sizeof(*ctrl) + size, GFP_KERNEL); | |
451 | if (!ctrl) | |
452 | return NULL; | |
453 | ||
454 | device_initialize(&ctrl->dev); | |
455 | ctrl->dev.type = &spmi_ctrl_type; | |
456 | ctrl->dev.bus = &spmi_bus_type; | |
457 | ctrl->dev.parent = parent; | |
458 | ctrl->dev.of_node = parent->of_node; | |
459 | spmi_controller_set_drvdata(ctrl, &ctrl[1]); | |
460 | ||
9357fc3b | 461 | id = ida_alloc(&ctrl_ida, GFP_KERNEL); |
5a86bf34 KH |
462 | if (id < 0) { |
463 | dev_err(parent, | |
464 | "unable to allocate SPMI controller identifier.\n"); | |
465 | spmi_controller_put(ctrl); | |
466 | return NULL; | |
467 | } | |
468 | ||
469 | ctrl->nr = id; | |
470 | dev_set_name(&ctrl->dev, "spmi-%d", id); | |
471 | ||
472 | dev_dbg(&ctrl->dev, "allocated controller 0x%p id %d\n", ctrl, id); | |
473 | return ctrl; | |
474 | } | |
475 | EXPORT_SYMBOL_GPL(spmi_controller_alloc); | |
476 | ||
477 | static void of_spmi_register_devices(struct spmi_controller *ctrl) | |
478 | { | |
479 | struct device_node *node; | |
480 | int err; | |
481 | ||
482 | if (!ctrl->dev.of_node) | |
483 | return; | |
484 | ||
485 | for_each_available_child_of_node(ctrl->dev.of_node, node) { | |
486 | struct spmi_device *sdev; | |
487 | u32 reg[2]; | |
488 | ||
e55fe64a | 489 | dev_dbg(&ctrl->dev, "adding child %pOF\n", node); |
5a86bf34 KH |
490 | |
491 | err = of_property_read_u32_array(node, "reg", reg, 2); | |
492 | if (err) { | |
493 | dev_err(&ctrl->dev, | |
e55fe64a RH |
494 | "node %pOF err (%d) does not have 'reg' property\n", |
495 | node, err); | |
5a86bf34 KH |
496 | continue; |
497 | } | |
498 | ||
499 | if (reg[1] != SPMI_USID) { | |
500 | dev_err(&ctrl->dev, | |
e55fe64a RH |
501 | "node %pOF contains unsupported 'reg' entry\n", |
502 | node); | |
5a86bf34 KH |
503 | continue; |
504 | } | |
505 | ||
506 | if (reg[0] >= SPMI_MAX_SLAVE_ID) { | |
e55fe64a | 507 | dev_err(&ctrl->dev, "invalid usid on node %pOF\n", node); |
5a86bf34 KH |
508 | continue; |
509 | } | |
510 | ||
511 | dev_dbg(&ctrl->dev, "read usid %02x\n", reg[0]); | |
512 | ||
513 | sdev = spmi_device_alloc(ctrl); | |
514 | if (!sdev) | |
515 | continue; | |
516 | ||
517 | sdev->dev.of_node = node; | |
0be0a733 | 518 | sdev->usid = (u8)reg[0]; |
5a86bf34 KH |
519 | |
520 | err = spmi_device_add(sdev); | |
521 | if (err) { | |
522 | dev_err(&sdev->dev, | |
523 | "failure adding device. status %d\n", err); | |
524 | spmi_device_put(sdev); | |
525 | } | |
526 | } | |
527 | } | |
528 | ||
529 | /** | |
530 | * spmi_controller_add() - Add an SPMI controller | |
531 | * @ctrl: controller to be registered. | |
532 | * | |
533 | * Register a controller previously allocated via spmi_controller_alloc() with | |
534 | * the SPMI core. | |
535 | */ | |
536 | int spmi_controller_add(struct spmi_controller *ctrl) | |
537 | { | |
538 | int ret; | |
539 | ||
540 | /* Can't register until after driver model init */ | |
47f55b74 | 541 | if (WARN_ON(!is_registered)) |
5a86bf34 KH |
542 | return -EAGAIN; |
543 | ||
544 | ret = device_add(&ctrl->dev); | |
545 | if (ret) | |
546 | return ret; | |
547 | ||
548 | if (IS_ENABLED(CONFIG_OF)) | |
549 | of_spmi_register_devices(ctrl); | |
550 | ||
551 | dev_dbg(&ctrl->dev, "spmi-%d registered: dev:%p\n", | |
552 | ctrl->nr, &ctrl->dev); | |
553 | ||
554 | return 0; | |
555 | }; | |
556 | EXPORT_SYMBOL_GPL(spmi_controller_add); | |
557 | ||
558 | /* Remove a device associated with a controller */ | |
559 | static int spmi_ctrl_remove_device(struct device *dev, void *data) | |
560 | { | |
561 | struct spmi_device *spmidev = to_spmi_device(dev); | |
0be0a733 | 562 | |
5a86bf34 KH |
563 | if (dev->type == &spmi_dev_type) |
564 | spmi_device_remove(spmidev); | |
565 | return 0; | |
566 | } | |
567 | ||
568 | /** | |
569 | * spmi_controller_remove(): remove an SPMI controller | |
570 | * @ctrl: controller to remove | |
571 | * | |
572 | * Remove a SPMI controller. Caller is responsible for calling | |
573 | * spmi_controller_put() to discard the allocated controller. | |
574 | */ | |
575 | void spmi_controller_remove(struct spmi_controller *ctrl) | |
576 | { | |
5a86bf34 KH |
577 | if (!ctrl) |
578 | return; | |
579 | ||
b1f0aeec | 580 | device_for_each_child(&ctrl->dev, NULL, spmi_ctrl_remove_device); |
5a86bf34 KH |
581 | device_del(&ctrl->dev); |
582 | } | |
583 | EXPORT_SYMBOL_GPL(spmi_controller_remove); | |
584 | ||
585 | /** | |
80c606a8 | 586 | * __spmi_driver_register() - Register client driver with SPMI core |
5a86bf34 | 587 | * @sdrv: client driver to be associated with client-device. |
80c606a8 | 588 | * @owner: module owner |
5a86bf34 KH |
589 | * |
590 | * This API will register the client driver with the SPMI framework. | |
591 | * It is typically called from the driver's module-init function. | |
592 | */ | |
ff6f4648 | 593 | int __spmi_driver_register(struct spmi_driver *sdrv, struct module *owner) |
5a86bf34 KH |
594 | { |
595 | sdrv->driver.bus = &spmi_bus_type; | |
ff6f4648 | 596 | sdrv->driver.owner = owner; |
5a86bf34 KH |
597 | return driver_register(&sdrv->driver); |
598 | } | |
ff6f4648 | 599 | EXPORT_SYMBOL_GPL(__spmi_driver_register); |
5a86bf34 KH |
600 | |
601 | static void __exit spmi_exit(void) | |
602 | { | |
603 | bus_unregister(&spmi_bus_type); | |
604 | } | |
605 | module_exit(spmi_exit); | |
606 | ||
607 | static int __init spmi_init(void) | |
608 | { | |
47f55b74 SM |
609 | int ret; |
610 | ||
611 | ret = bus_register(&spmi_bus_type); | |
612 | if (ret) | |
613 | return ret; | |
614 | ||
615 | is_registered = true; | |
616 | return 0; | |
5a86bf34 KH |
617 | } |
618 | postcore_initcall(spmi_init); | |
619 | ||
620 | MODULE_LICENSE("GPL v2"); | |
621 | MODULE_DESCRIPTION("SPMI module"); | |
622 | MODULE_ALIAS("platform:spmi"); |