1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2019-2020, The Linux Foundation. All rights reserved.
4 * Copyright (c) 2022, Linaro Ltd
5 */
6#include <linux/auxiliary_bus.h>
7#include <linux/module.h>
8#include <linux/of.h>
9#include <linux/platform_device.h>
10#include <linux/rpmsg.h>
11#include <linux/slab.h>
12#include <linux/soc/qcom/pdr.h>
13#include <linux/soc/qcom/pmic_glink.h>
14
15enum {
16 PMIC_GLINK_CLIENT_BATT = 0,
17 PMIC_GLINK_CLIENT_ALTMODE,
18 PMIC_GLINK_CLIENT_UCSI,
19};
20
21struct pmic_glink {
22 struct device *dev;
23 struct pdr_handle *pdr;
24
25 struct rpmsg_endpoint *ept;
26
27 unsigned long client_mask;
28
29 struct auxiliary_device altmode_aux;
30 struct auxiliary_device ps_aux;
31 struct auxiliary_device ucsi_aux;
32
33 /* serializing client_state and pdr_state updates */
34 struct mutex state_lock;
35 unsigned int client_state;
36 unsigned int pdr_state;
37
38 /* serializing clients list updates */
39 struct mutex client_lock;
40 struct list_head clients;
41};
42
43static struct pmic_glink *__pmic_glink;
44static DEFINE_MUTEX(__pmic_glink_lock);
45
46struct pmic_glink_client {
47 struct list_head node;
48
49 struct pmic_glink *pg;
50 unsigned int id;
51
52 void (*cb)(const void *data, size_t len, void *priv);
53 void (*pdr_notify)(void *priv, int state);
54 void *priv;
55};
56
57static void _devm_pmic_glink_release_client(struct device *dev, void *res)
58{
59 struct pmic_glink_client *client = (struct pmic_glink_client *)res;
60 struct pmic_glink *pg = client->pg;
61
62 mutex_lock(&pg->client_lock);
63 list_del(entry: &client->node);
64 mutex_unlock(lock: &pg->client_lock);
65}
66
67struct pmic_glink_client *devm_pmic_glink_register_client(struct device *dev,
68 unsigned int id,
69 void (*cb)(const void *, size_t, void *),
70 void (*pdr)(void *, int),
71 void *priv)
72{
73 struct pmic_glink_client *client;
74 struct pmic_glink *pg = dev_get_drvdata(dev: dev->parent);
75
76 client = devres_alloc(_devm_pmic_glink_release_client, sizeof(*client), GFP_KERNEL);
77 if (!client)
78 return ERR_PTR(error: -ENOMEM);
79
80 client->pg = pg;
81 client->id = id;
82 client->cb = cb;
83 client->pdr_notify = pdr;
84 client->priv = priv;
85
86 mutex_lock(&pg->client_lock);
87 list_add(new: &client->node, head: &pg->clients);
88 mutex_unlock(lock: &pg->client_lock);
89
90 devres_add(dev, res: client);
91
92 return client;
93}
94EXPORT_SYMBOL_GPL(devm_pmic_glink_register_client);
95
96int pmic_glink_send(struct pmic_glink_client *client, void *data, size_t len)
97{
98 struct pmic_glink *pg = client->pg;
99
100 return rpmsg_send(ept: pg->ept, data, len);
101}
102EXPORT_SYMBOL_GPL(pmic_glink_send);
103
104static int pmic_glink_rpmsg_callback(struct rpmsg_device *rpdev, void *data,
105 int len, void *priv, u32 addr)
106{
107 struct pmic_glink_client *client;
108 struct pmic_glink_hdr *hdr;
109 struct pmic_glink *pg = dev_get_drvdata(dev: &rpdev->dev);
110
111 if (len < sizeof(*hdr)) {
112 dev_warn(pg->dev, "ignoring truncated message\n");
113 return 0;
114 }
115
116 hdr = data;
117
118 list_for_each_entry(client, &pg->clients, node) {
119 if (client->id == le32_to_cpu(hdr->owner))
120 client->cb(data, len, client->priv);
121 }
122
123 return 0;
124}
125
126static void pmic_glink_aux_release(struct device *dev) {}
127
128static int pmic_glink_add_aux_device(struct pmic_glink *pg,
129 struct auxiliary_device *aux,
130 const char *name)
131{
132 struct device *parent = pg->dev;
133 int ret;
134
135 aux->name = name;
136 aux->dev.parent = parent;
137 aux->dev.release = pmic_glink_aux_release;
138 device_set_of_node_from_dev(dev: &aux->dev, dev2: parent);
139 ret = auxiliary_device_init(auxdev: aux);
140 if (ret)
141 return ret;
142
143 ret = auxiliary_device_add(aux);
144 if (ret)
145 auxiliary_device_uninit(auxdev: aux);
146
147 return ret;
148}
149
150static void pmic_glink_del_aux_device(struct pmic_glink *pg,
151 struct auxiliary_device *aux)
152{
153 auxiliary_device_delete(auxdev: aux);
154 auxiliary_device_uninit(auxdev: aux);
155}
156
157static void pmic_glink_state_notify_clients(struct pmic_glink *pg)
158{
159 struct pmic_glink_client *client;
160 unsigned int new_state = pg->client_state;
161
162 if (pg->client_state != SERVREG_SERVICE_STATE_UP) {
163 if (pg->pdr_state == SERVREG_SERVICE_STATE_UP && pg->ept)
164 new_state = SERVREG_SERVICE_STATE_UP;
165 } else {
166 if (pg->pdr_state == SERVREG_SERVICE_STATE_UP && pg->ept)
167 new_state = SERVREG_SERVICE_STATE_DOWN;
168 }
169
170 if (new_state != pg->client_state) {
171 list_for_each_entry(client, &pg->clients, node)
172 client->pdr_notify(client->priv, new_state);
173 pg->client_state = new_state;
174 }
175}
176
177static void pmic_glink_pdr_callback(int state, char *svc_path, void *priv)
178{
179 struct pmic_glink *pg = priv;
180
181 mutex_lock(&pg->state_lock);
182 pg->pdr_state = state;
183
184 pmic_glink_state_notify_clients(pg);
185 mutex_unlock(lock: &pg->state_lock);
186}
187
188static int pmic_glink_rpmsg_probe(struct rpmsg_device *rpdev)
189{
190 struct pmic_glink *pg = __pmic_glink;
191 int ret = 0;
192
193 mutex_lock(&__pmic_glink_lock);
194 if (!pg) {
195 ret = dev_err_probe(dev: &rpdev->dev, err: -ENODEV, fmt: "no pmic_glink device to attach to\n");
196 goto out_unlock;
197 }
198
199 dev_set_drvdata(dev: &rpdev->dev, data: pg);
200
201 mutex_lock(&pg->state_lock);
202 pg->ept = rpdev->ept;
203 pmic_glink_state_notify_clients(pg);
204 mutex_unlock(lock: &pg->state_lock);
205
206out_unlock:
207 mutex_unlock(lock: &__pmic_glink_lock);
208 return ret;
209}
210
211static void pmic_glink_rpmsg_remove(struct rpmsg_device *rpdev)
212{
213 struct pmic_glink *pg;
214
215 mutex_lock(&__pmic_glink_lock);
216 pg = __pmic_glink;
217 if (!pg)
218 goto out_unlock;
219
220 mutex_lock(&pg->state_lock);
221 pg->ept = NULL;
222 pmic_glink_state_notify_clients(pg);
223 mutex_unlock(lock: &pg->state_lock);
224out_unlock:
225 mutex_unlock(lock: &__pmic_glink_lock);
226}
227
228static const struct rpmsg_device_id pmic_glink_rpmsg_id_match[] = {
229 { "PMIC_RTR_ADSP_APPS" },
230 {}
231};
232
233static struct rpmsg_driver pmic_glink_rpmsg_driver = {
234 .probe = pmic_glink_rpmsg_probe,
235 .remove = pmic_glink_rpmsg_remove,
236 .callback = pmic_glink_rpmsg_callback,
237 .id_table = pmic_glink_rpmsg_id_match,
238 .drv = {
239 .name = "qcom_pmic_glink_rpmsg",
240 },
241};
242
243static int pmic_glink_probe(struct platform_device *pdev)
244{
245 const unsigned long *match_data;
246 struct pdr_service *service;
247 struct pmic_glink *pg;
248 int ret;
249
250 pg = devm_kzalloc(dev: &pdev->dev, size: sizeof(*pg), GFP_KERNEL);
251 if (!pg)
252 return -ENOMEM;
253
254 dev_set_drvdata(dev: &pdev->dev, data: pg);
255
256 pg->dev = &pdev->dev;
257
258 INIT_LIST_HEAD(list: &pg->clients);
259 mutex_init(&pg->client_lock);
260 mutex_init(&pg->state_lock);
261
262 match_data = (unsigned long *)of_device_get_match_data(dev: &pdev->dev);
263 if (!match_data)
264 return -EINVAL;
265
266 pg->client_mask = *match_data;
267
268 pg->pdr = pdr_handle_alloc(status: pmic_glink_pdr_callback, priv: pg);
269 if (IS_ERR(ptr: pg->pdr)) {
270 ret = dev_err_probe(dev: &pdev->dev, err: PTR_ERR(ptr: pg->pdr),
271 fmt: "failed to initialize pdr\n");
272 return ret;
273 }
274
275 if (pg->client_mask & BIT(PMIC_GLINK_CLIENT_UCSI)) {
276 ret = pmic_glink_add_aux_device(pg, aux: &pg->ucsi_aux, name: "ucsi");
277 if (ret)
278 goto out_release_pdr_handle;
279 }
280 if (pg->client_mask & BIT(PMIC_GLINK_CLIENT_ALTMODE)) {
281 ret = pmic_glink_add_aux_device(pg, aux: &pg->altmode_aux, name: "altmode");
282 if (ret)
283 goto out_release_ucsi_aux;
284 }
285 if (pg->client_mask & BIT(PMIC_GLINK_CLIENT_BATT)) {
286 ret = pmic_glink_add_aux_device(pg, aux: &pg->ps_aux, name: "power-supply");
287 if (ret)
288 goto out_release_altmode_aux;
289 }
290
291 service = pdr_add_lookup(pdr: pg->pdr, service_name: "tms/servreg", service_path: "msm/adsp/charger_pd");
292 if (IS_ERR(ptr: service)) {
293 ret = dev_err_probe(dev: &pdev->dev, err: PTR_ERR(ptr: service),
294 fmt: "failed adding pdr lookup for charger_pd\n");
295 goto out_release_aux_devices;
296 }
297
298 mutex_lock(&__pmic_glink_lock);
299 __pmic_glink = pg;
300 mutex_unlock(lock: &__pmic_glink_lock);
301
302 return 0;
303
304out_release_aux_devices:
305 if (pg->client_mask & BIT(PMIC_GLINK_CLIENT_BATT))
306 pmic_glink_del_aux_device(pg, aux: &pg->ps_aux);
307out_release_altmode_aux:
308 if (pg->client_mask & BIT(PMIC_GLINK_CLIENT_ALTMODE))
309 pmic_glink_del_aux_device(pg, aux: &pg->altmode_aux);
310out_release_ucsi_aux:
311 if (pg->client_mask & BIT(PMIC_GLINK_CLIENT_UCSI))
312 pmic_glink_del_aux_device(pg, aux: &pg->ucsi_aux);
313out_release_pdr_handle:
314 pdr_handle_release(pdr: pg->pdr);
315
316 return ret;
317}
318
319static void pmic_glink_remove(struct platform_device *pdev)
320{
321 struct pmic_glink *pg = dev_get_drvdata(dev: &pdev->dev);
322
323 pdr_handle_release(pdr: pg->pdr);
324
325 if (pg->client_mask & BIT(PMIC_GLINK_CLIENT_BATT))
326 pmic_glink_del_aux_device(pg, aux: &pg->ps_aux);
327 if (pg->client_mask & BIT(PMIC_GLINK_CLIENT_ALTMODE))
328 pmic_glink_del_aux_device(pg, aux: &pg->altmode_aux);
329 if (pg->client_mask & BIT(PMIC_GLINK_CLIENT_UCSI))
330 pmic_glink_del_aux_device(pg, aux: &pg->ucsi_aux);
331
332 mutex_lock(&__pmic_glink_lock);
333 __pmic_glink = NULL;
334 mutex_unlock(lock: &__pmic_glink_lock);
335}
336
337static const unsigned long pmic_glink_sc8180x_client_mask = BIT(PMIC_GLINK_CLIENT_BATT) |
338 BIT(PMIC_GLINK_CLIENT_ALTMODE);
339
340static const unsigned long pmic_glink_sm8450_client_mask = BIT(PMIC_GLINK_CLIENT_BATT) |
341 BIT(PMIC_GLINK_CLIENT_ALTMODE) |
342 BIT(PMIC_GLINK_CLIENT_UCSI);
343
344static const struct of_device_id pmic_glink_of_match[] = {
345 { .compatible = "qcom,sc8180x-pmic-glink", .data = &pmic_glink_sc8180x_client_mask },
346 { .compatible = "qcom,sc8280xp-pmic-glink", .data = &pmic_glink_sc8180x_client_mask },
347 { .compatible = "qcom,pmic-glink", .data = &pmic_glink_sm8450_client_mask },
348 {}
349};
350MODULE_DEVICE_TABLE(of, pmic_glink_of_match);
351
352static struct platform_driver pmic_glink_driver = {
353 .probe = pmic_glink_probe,
354 .remove_new = pmic_glink_remove,
355 .driver = {
356 .name = "qcom_pmic_glink",
357 .of_match_table = pmic_glink_of_match,
358 },
359};
360
361static int pmic_glink_init(void)
362{
363 platform_driver_register(&pmic_glink_driver);
364 register_rpmsg_driver(&pmic_glink_rpmsg_driver);
365
366 return 0;
367}
368module_init(pmic_glink_init);
369
370static void pmic_glink_exit(void)
371{
372 unregister_rpmsg_driver(drv: &pmic_glink_rpmsg_driver);
373 platform_driver_unregister(&pmic_glink_driver);
374}
375module_exit(pmic_glink_exit);
376
377MODULE_DESCRIPTION("Qualcomm PMIC GLINK driver");
378MODULE_LICENSE("GPL");
379

source code of linux/drivers/soc/qcom/pmic_glink.c