1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2019-2020, The Linux Foundation. All rights reserved.
4 * Copyright (c) 2022, Linaro Ltd
6 #include <linux/auxiliary_bus.h>
7 #include <linux/module.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>
16 PMIC_GLINK_CLIENT_BATT = 0,
17 PMIC_GLINK_CLIENT_ALTMODE,
18 PMIC_GLINK_CLIENT_UCSI,
23 struct pdr_handle *pdr;
25 struct rpmsg_endpoint *ept;
27 unsigned long client_mask;
29 struct auxiliary_device altmode_aux;
30 struct auxiliary_device ps_aux;
31 struct auxiliary_device ucsi_aux;
33 /* serializing client_state and pdr_state updates */
34 struct mutex state_lock;
35 unsigned int client_state;
36 unsigned int pdr_state;
38 /* serializing clients list updates */
39 struct mutex client_lock;
40 struct list_head clients;
43 static struct pmic_glink *__pmic_glink;
44 static DEFINE_MUTEX(__pmic_glink_lock);
46 struct pmic_glink_client {
47 struct list_head node;
49 struct pmic_glink *pg;
52 void (*cb)(const void *data, size_t len, void *priv);
53 void (*pdr_notify)(void *priv, int state);
57 static void _devm_pmic_glink_release_client(struct device *dev, void *res)
59 struct pmic_glink_client *client = (struct pmic_glink_client *)res;
60 struct pmic_glink *pg = client->pg;
62 mutex_lock(&pg->client_lock);
63 list_del(&client->node);
64 mutex_unlock(&pg->client_lock);
67 struct pmic_glink_client *devm_pmic_glink_register_client(struct device *dev,
69 void (*cb)(const void *, size_t, void *),
70 void (*pdr)(void *, int),
73 struct pmic_glink_client *client;
74 struct pmic_glink *pg = dev_get_drvdata(dev->parent);
76 client = devres_alloc(_devm_pmic_glink_release_client, sizeof(*client), GFP_KERNEL);
78 return ERR_PTR(-ENOMEM);
83 client->pdr_notify = pdr;
86 mutex_lock(&pg->client_lock);
87 list_add(&client->node, &pg->clients);
88 mutex_unlock(&pg->client_lock);
90 devres_add(dev, client);
94 EXPORT_SYMBOL_GPL(devm_pmic_glink_register_client);
96 int pmic_glink_send(struct pmic_glink_client *client, void *data, size_t len)
98 struct pmic_glink *pg = client->pg;
100 return rpmsg_send(pg->ept, data, len);
102 EXPORT_SYMBOL_GPL(pmic_glink_send);
104 static int pmic_glink_rpmsg_callback(struct rpmsg_device *rpdev, void *data,
105 int len, void *priv, u32 addr)
107 struct pmic_glink_client *client;
108 struct pmic_glink_hdr *hdr;
109 struct pmic_glink *pg = dev_get_drvdata(&rpdev->dev);
111 if (len < sizeof(*hdr)) {
112 dev_warn(pg->dev, "ignoring truncated message\n");
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);
126 static void pmic_glink_aux_release(struct device *dev) {}
128 static int pmic_glink_add_aux_device(struct pmic_glink *pg,
129 struct auxiliary_device *aux,
132 struct device *parent = pg->dev;
136 aux->dev.parent = parent;
137 aux->dev.release = pmic_glink_aux_release;
138 device_set_of_node_from_dev(&aux->dev, parent);
139 ret = auxiliary_device_init(aux);
143 ret = auxiliary_device_add(aux);
145 auxiliary_device_uninit(aux);
150 static void pmic_glink_del_aux_device(struct pmic_glink *pg,
151 struct auxiliary_device *aux)
153 auxiliary_device_delete(aux);
154 auxiliary_device_uninit(aux);
157 static void pmic_glink_state_notify_clients(struct pmic_glink *pg)
159 struct pmic_glink_client *client;
160 unsigned int new_state = pg->client_state;
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;
166 if (pg->pdr_state == SERVREG_SERVICE_STATE_UP && pg->ept)
167 new_state = SERVREG_SERVICE_STATE_DOWN;
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;
177 static void pmic_glink_pdr_callback(int state, char *svc_path, void *priv)
179 struct pmic_glink *pg = priv;
181 mutex_lock(&pg->state_lock);
182 pg->pdr_state = state;
184 pmic_glink_state_notify_clients(pg);
185 mutex_unlock(&pg->state_lock);
188 static int pmic_glink_rpmsg_probe(struct rpmsg_device *rpdev)
190 struct pmic_glink *pg = __pmic_glink;
193 mutex_lock(&__pmic_glink_lock);
195 ret = dev_err_probe(&rpdev->dev, -ENODEV, "no pmic_glink device to attach to\n");
199 dev_set_drvdata(&rpdev->dev, pg);
201 mutex_lock(&pg->state_lock);
202 pg->ept = rpdev->ept;
203 pmic_glink_state_notify_clients(pg);
204 mutex_unlock(&pg->state_lock);
207 mutex_unlock(&__pmic_glink_lock);
211 static void pmic_glink_rpmsg_remove(struct rpmsg_device *rpdev)
213 struct pmic_glink *pg;
215 mutex_lock(&__pmic_glink_lock);
220 mutex_lock(&pg->state_lock);
222 pmic_glink_state_notify_clients(pg);
223 mutex_unlock(&pg->state_lock);
225 mutex_unlock(&__pmic_glink_lock);
228 static const struct rpmsg_device_id pmic_glink_rpmsg_id_match[] = {
229 { "PMIC_RTR_ADSP_APPS" },
233 static 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,
239 .name = "qcom_pmic_glink_rpmsg",
243 static int pmic_glink_probe(struct platform_device *pdev)
245 const unsigned long *match_data;
246 struct pdr_service *service;
247 struct pmic_glink *pg;
250 pg = devm_kzalloc(&pdev->dev, sizeof(*pg), GFP_KERNEL);
254 dev_set_drvdata(&pdev->dev, pg);
256 pg->dev = &pdev->dev;
258 INIT_LIST_HEAD(&pg->clients);
259 mutex_init(&pg->client_lock);
260 mutex_init(&pg->state_lock);
262 match_data = (unsigned long *)of_device_get_match_data(&pdev->dev);
266 pg->client_mask = *match_data;
268 pg->pdr = pdr_handle_alloc(pmic_glink_pdr_callback, pg);
269 if (IS_ERR(pg->pdr)) {
270 ret = dev_err_probe(&pdev->dev, PTR_ERR(pg->pdr),
271 "failed to initialize pdr\n");
275 if (pg->client_mask & BIT(PMIC_GLINK_CLIENT_UCSI)) {
276 ret = pmic_glink_add_aux_device(pg, &pg->ucsi_aux, "ucsi");
278 goto out_release_pdr_handle;
280 if (pg->client_mask & BIT(PMIC_GLINK_CLIENT_ALTMODE)) {
281 ret = pmic_glink_add_aux_device(pg, &pg->altmode_aux, "altmode");
283 goto out_release_ucsi_aux;
285 if (pg->client_mask & BIT(PMIC_GLINK_CLIENT_BATT)) {
286 ret = pmic_glink_add_aux_device(pg, &pg->ps_aux, "power-supply");
288 goto out_release_altmode_aux;
291 service = pdr_add_lookup(pg->pdr, "tms/servreg", "msm/adsp/charger_pd");
292 if (IS_ERR(service)) {
293 ret = dev_err_probe(&pdev->dev, PTR_ERR(service),
294 "failed adding pdr lookup for charger_pd\n");
295 goto out_release_aux_devices;
298 mutex_lock(&__pmic_glink_lock);
300 mutex_unlock(&__pmic_glink_lock);
304 out_release_aux_devices:
305 if (pg->client_mask & BIT(PMIC_GLINK_CLIENT_BATT))
306 pmic_glink_del_aux_device(pg, &pg->ps_aux);
307 out_release_altmode_aux:
308 if (pg->client_mask & BIT(PMIC_GLINK_CLIENT_ALTMODE))
309 pmic_glink_del_aux_device(pg, &pg->altmode_aux);
310 out_release_ucsi_aux:
311 if (pg->client_mask & BIT(PMIC_GLINK_CLIENT_UCSI))
312 pmic_glink_del_aux_device(pg, &pg->ucsi_aux);
313 out_release_pdr_handle:
314 pdr_handle_release(pg->pdr);
319 static void pmic_glink_remove(struct platform_device *pdev)
321 struct pmic_glink *pg = dev_get_drvdata(&pdev->dev);
323 pdr_handle_release(pg->pdr);
325 if (pg->client_mask & BIT(PMIC_GLINK_CLIENT_BATT))
326 pmic_glink_del_aux_device(pg, &pg->ps_aux);
327 if (pg->client_mask & BIT(PMIC_GLINK_CLIENT_ALTMODE))
328 pmic_glink_del_aux_device(pg, &pg->altmode_aux);
329 if (pg->client_mask & BIT(PMIC_GLINK_CLIENT_UCSI))
330 pmic_glink_del_aux_device(pg, &pg->ucsi_aux);
332 mutex_lock(&__pmic_glink_lock);
334 mutex_unlock(&__pmic_glink_lock);
337 static const unsigned long pmic_glink_sc8180x_client_mask = BIT(PMIC_GLINK_CLIENT_BATT) |
338 BIT(PMIC_GLINK_CLIENT_ALTMODE);
340 static 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);
344 static 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 },
350 MODULE_DEVICE_TABLE(of, pmic_glink_of_match);
352 static struct platform_driver pmic_glink_driver = {
353 .probe = pmic_glink_probe,
354 .remove_new = pmic_glink_remove,
356 .name = "qcom_pmic_glink",
357 .of_match_table = pmic_glink_of_match,
361 static int pmic_glink_init(void)
363 platform_driver_register(&pmic_glink_driver);
364 register_rpmsg_driver(&pmic_glink_rpmsg_driver);
368 module_init(pmic_glink_init);
370 static void pmic_glink_exit(void)
372 unregister_rpmsg_driver(&pmic_glink_rpmsg_driver);
373 platform_driver_unregister(&pmic_glink_driver);
375 module_exit(pmic_glink_exit);
377 MODULE_DESCRIPTION("Qualcomm PMIC GLINK driver");
378 MODULE_LICENSE("GPL");