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 #include <linux/spinlock.h> 15 16 enum { 17 PMIC_GLINK_CLIENT_BATT = 0, 18 PMIC_GLINK_CLIENT_ALTMODE, 19 PMIC_GLINK_CLIENT_UCSI, 20 }; 21 22 #define PMIC_GLINK_CLIENT_DEFAULT (BIT(PMIC_GLINK_CLIENT_BATT) | \ 23 BIT(PMIC_GLINK_CLIENT_ALTMODE)) 24 25 struct pmic_glink { 26 struct device *dev; 27 struct pdr_handle *pdr; 28 29 struct rpmsg_endpoint *ept; 30 31 unsigned long client_mask; 32 33 struct auxiliary_device altmode_aux; 34 struct auxiliary_device ps_aux; 35 struct auxiliary_device ucsi_aux; 36 37 /* serializing client_state and pdr_state updates */ 38 struct mutex state_lock; 39 unsigned int client_state; 40 unsigned int pdr_state; 41 42 /* serializing clients list updates */ 43 spinlock_t client_lock; 44 struct list_head clients; 45 }; 46 47 static struct pmic_glink *__pmic_glink; 48 static DEFINE_MUTEX(__pmic_glink_lock); 49 50 struct pmic_glink_client { 51 struct list_head node; 52 53 struct pmic_glink *pg; 54 unsigned int id; 55 56 void (*cb)(const void *data, size_t len, void *priv); 57 void (*pdr_notify)(void *priv, int state); 58 void *priv; 59 }; 60 61 static void _devm_pmic_glink_release_client(struct device *dev, void *res) 62 { 63 struct pmic_glink_client *client = (struct pmic_glink_client *)res; 64 struct pmic_glink *pg = client->pg; 65 unsigned long flags; 66 67 spin_lock_irqsave(&pg->client_lock, flags); 68 list_del(&client->node); 69 spin_unlock_irqrestore(&pg->client_lock, flags); 70 } 71 72 struct pmic_glink_client *devm_pmic_glink_client_alloc(struct device *dev, 73 unsigned int id, 74 void (*cb)(const void *, size_t, void *), 75 void (*pdr)(void *, int), 76 void *priv) 77 { 78 struct pmic_glink_client *client; 79 struct pmic_glink *pg = dev_get_drvdata(dev->parent); 80 81 client = devres_alloc(_devm_pmic_glink_release_client, sizeof(*client), GFP_KERNEL); 82 if (!client) 83 return ERR_PTR(-ENOMEM); 84 85 client->pg = pg; 86 client->id = id; 87 client->cb = cb; 88 client->pdr_notify = pdr; 89 client->priv = priv; 90 INIT_LIST_HEAD(&client->node); 91 92 devres_add(dev, client); 93 94 return client; 95 } 96 EXPORT_SYMBOL_GPL(devm_pmic_glink_client_alloc); 97 98 void pmic_glink_client_register(struct pmic_glink_client *client) 99 { 100 struct pmic_glink *pg = client->pg; 101 unsigned long flags; 102 103 mutex_lock(&pg->state_lock); 104 spin_lock_irqsave(&pg->client_lock, flags); 105 106 list_add(&client->node, &pg->clients); 107 client->pdr_notify(client->priv, pg->client_state); 108 109 spin_unlock_irqrestore(&pg->client_lock, flags); 110 mutex_unlock(&pg->state_lock); 111 112 } 113 EXPORT_SYMBOL_GPL(pmic_glink_client_register); 114 115 int pmic_glink_send(struct pmic_glink_client *client, void *data, size_t len) 116 { 117 struct pmic_glink *pg = client->pg; 118 119 return rpmsg_send(pg->ept, data, len); 120 } 121 EXPORT_SYMBOL_GPL(pmic_glink_send); 122 123 static int pmic_glink_rpmsg_callback(struct rpmsg_device *rpdev, void *data, 124 int len, void *priv, u32 addr) 125 { 126 struct pmic_glink_client *client; 127 struct pmic_glink_hdr *hdr; 128 struct pmic_glink *pg = dev_get_drvdata(&rpdev->dev); 129 unsigned long flags; 130 131 if (len < sizeof(*hdr)) { 132 dev_warn(pg->dev, "ignoring truncated message\n"); 133 return 0; 134 } 135 136 hdr = data; 137 138 spin_lock_irqsave(&pg->client_lock, flags); 139 list_for_each_entry(client, &pg->clients, node) { 140 if (client->id == le32_to_cpu(hdr->owner)) 141 client->cb(data, len, client->priv); 142 } 143 spin_unlock_irqrestore(&pg->client_lock, flags); 144 145 return 0; 146 } 147 148 static void pmic_glink_aux_release(struct device *dev) {} 149 150 static int pmic_glink_add_aux_device(struct pmic_glink *pg, 151 struct auxiliary_device *aux, 152 const char *name) 153 { 154 struct device *parent = pg->dev; 155 int ret; 156 157 aux->name = name; 158 aux->dev.parent = parent; 159 aux->dev.release = pmic_glink_aux_release; 160 device_set_of_node_from_dev(&aux->dev, parent); 161 ret = auxiliary_device_init(aux); 162 if (ret) 163 return ret; 164 165 ret = auxiliary_device_add(aux); 166 if (ret) 167 auxiliary_device_uninit(aux); 168 169 return ret; 170 } 171 172 static void pmic_glink_del_aux_device(struct pmic_glink *pg, 173 struct auxiliary_device *aux) 174 { 175 auxiliary_device_delete(aux); 176 auxiliary_device_uninit(aux); 177 } 178 179 static void pmic_glink_state_notify_clients(struct pmic_glink *pg) 180 { 181 struct pmic_glink_client *client; 182 unsigned int new_state = pg->client_state; 183 unsigned long flags; 184 185 if (pg->client_state != SERVREG_SERVICE_STATE_UP) { 186 if (pg->pdr_state == SERVREG_SERVICE_STATE_UP && pg->ept) 187 new_state = SERVREG_SERVICE_STATE_UP; 188 } else { 189 if (pg->pdr_state == SERVREG_SERVICE_STATE_DOWN || !pg->ept) 190 new_state = SERVREG_SERVICE_STATE_DOWN; 191 } 192 193 if (new_state != pg->client_state) { 194 spin_lock_irqsave(&pg->client_lock, flags); 195 list_for_each_entry(client, &pg->clients, node) 196 client->pdr_notify(client->priv, new_state); 197 spin_unlock_irqrestore(&pg->client_lock, flags); 198 pg->client_state = new_state; 199 } 200 } 201 202 static void pmic_glink_pdr_callback(int state, char *svc_path, void *priv) 203 { 204 struct pmic_glink *pg = priv; 205 206 mutex_lock(&pg->state_lock); 207 pg->pdr_state = state; 208 209 pmic_glink_state_notify_clients(pg); 210 mutex_unlock(&pg->state_lock); 211 } 212 213 static int pmic_glink_rpmsg_probe(struct rpmsg_device *rpdev) 214 { 215 struct pmic_glink *pg = __pmic_glink; 216 int ret = 0; 217 218 mutex_lock(&__pmic_glink_lock); 219 if (!pg) { 220 ret = dev_err_probe(&rpdev->dev, -ENODEV, "no pmic_glink device to attach to\n"); 221 goto out_unlock; 222 } 223 224 dev_set_drvdata(&rpdev->dev, pg); 225 226 mutex_lock(&pg->state_lock); 227 pg->ept = rpdev->ept; 228 pmic_glink_state_notify_clients(pg); 229 mutex_unlock(&pg->state_lock); 230 231 out_unlock: 232 mutex_unlock(&__pmic_glink_lock); 233 return ret; 234 } 235 236 static void pmic_glink_rpmsg_remove(struct rpmsg_device *rpdev) 237 { 238 struct pmic_glink *pg; 239 240 mutex_lock(&__pmic_glink_lock); 241 pg = __pmic_glink; 242 if (!pg) 243 goto out_unlock; 244 245 mutex_lock(&pg->state_lock); 246 pg->ept = NULL; 247 pmic_glink_state_notify_clients(pg); 248 mutex_unlock(&pg->state_lock); 249 out_unlock: 250 mutex_unlock(&__pmic_glink_lock); 251 } 252 253 static const struct rpmsg_device_id pmic_glink_rpmsg_id_match[] = { 254 { "PMIC_RTR_ADSP_APPS" }, 255 {} 256 }; 257 258 static struct rpmsg_driver pmic_glink_rpmsg_driver = { 259 .probe = pmic_glink_rpmsg_probe, 260 .remove = pmic_glink_rpmsg_remove, 261 .callback = pmic_glink_rpmsg_callback, 262 .id_table = pmic_glink_rpmsg_id_match, 263 .drv = { 264 .name = "qcom_pmic_glink_rpmsg", 265 }, 266 }; 267 268 static int pmic_glink_probe(struct platform_device *pdev) 269 { 270 const unsigned long *match_data; 271 struct pdr_service *service; 272 struct pmic_glink *pg; 273 int ret; 274 275 pg = devm_kzalloc(&pdev->dev, sizeof(*pg), GFP_KERNEL); 276 if (!pg) 277 return -ENOMEM; 278 279 dev_set_drvdata(&pdev->dev, pg); 280 281 pg->dev = &pdev->dev; 282 283 INIT_LIST_HEAD(&pg->clients); 284 spin_lock_init(&pg->client_lock); 285 mutex_init(&pg->state_lock); 286 287 match_data = (unsigned long *)of_device_get_match_data(&pdev->dev); 288 if (match_data) 289 pg->client_mask = *match_data; 290 else 291 pg->client_mask = PMIC_GLINK_CLIENT_DEFAULT; 292 293 pg->pdr = pdr_handle_alloc(pmic_glink_pdr_callback, pg); 294 if (IS_ERR(pg->pdr)) { 295 ret = dev_err_probe(&pdev->dev, PTR_ERR(pg->pdr), 296 "failed to initialize pdr\n"); 297 return ret; 298 } 299 300 if (pg->client_mask & BIT(PMIC_GLINK_CLIENT_UCSI)) { 301 ret = pmic_glink_add_aux_device(pg, &pg->ucsi_aux, "ucsi"); 302 if (ret) 303 goto out_release_pdr_handle; 304 } 305 if (pg->client_mask & BIT(PMIC_GLINK_CLIENT_ALTMODE)) { 306 ret = pmic_glink_add_aux_device(pg, &pg->altmode_aux, "altmode"); 307 if (ret) 308 goto out_release_ucsi_aux; 309 } 310 if (pg->client_mask & BIT(PMIC_GLINK_CLIENT_BATT)) { 311 ret = pmic_glink_add_aux_device(pg, &pg->ps_aux, "power-supply"); 312 if (ret) 313 goto out_release_altmode_aux; 314 } 315 316 service = pdr_add_lookup(pg->pdr, "tms/servreg", "msm/adsp/charger_pd"); 317 if (IS_ERR(service)) { 318 ret = dev_err_probe(&pdev->dev, PTR_ERR(service), 319 "failed adding pdr lookup for charger_pd\n"); 320 goto out_release_aux_devices; 321 } 322 323 mutex_lock(&__pmic_glink_lock); 324 __pmic_glink = pg; 325 mutex_unlock(&__pmic_glink_lock); 326 327 return 0; 328 329 out_release_aux_devices: 330 if (pg->client_mask & BIT(PMIC_GLINK_CLIENT_BATT)) 331 pmic_glink_del_aux_device(pg, &pg->ps_aux); 332 out_release_altmode_aux: 333 if (pg->client_mask & BIT(PMIC_GLINK_CLIENT_ALTMODE)) 334 pmic_glink_del_aux_device(pg, &pg->altmode_aux); 335 out_release_ucsi_aux: 336 if (pg->client_mask & BIT(PMIC_GLINK_CLIENT_UCSI)) 337 pmic_glink_del_aux_device(pg, &pg->ucsi_aux); 338 out_release_pdr_handle: 339 pdr_handle_release(pg->pdr); 340 341 return ret; 342 } 343 344 static int pmic_glink_remove(struct platform_device *pdev) 345 { 346 struct pmic_glink *pg = dev_get_drvdata(&pdev->dev); 347 348 pdr_handle_release(pg->pdr); 349 350 if (pg->client_mask & BIT(PMIC_GLINK_CLIENT_BATT)) 351 pmic_glink_del_aux_device(pg, &pg->ps_aux); 352 if (pg->client_mask & BIT(PMIC_GLINK_CLIENT_ALTMODE)) 353 pmic_glink_del_aux_device(pg, &pg->altmode_aux); 354 if (pg->client_mask & BIT(PMIC_GLINK_CLIENT_UCSI)) 355 pmic_glink_del_aux_device(pg, &pg->ucsi_aux); 356 357 mutex_lock(&__pmic_glink_lock); 358 __pmic_glink = NULL; 359 mutex_unlock(&__pmic_glink_lock); 360 361 return 0; 362 } 363 364 static const unsigned long pmic_glink_sm8450_client_mask = BIT(PMIC_GLINK_CLIENT_BATT) | 365 BIT(PMIC_GLINK_CLIENT_ALTMODE) | 366 BIT(PMIC_GLINK_CLIENT_UCSI); 367 368 static const struct of_device_id pmic_glink_of_match[] = { 369 { .compatible = "qcom,sm8450-pmic-glink", .data = &pmic_glink_sm8450_client_mask }, 370 { .compatible = "qcom,sm8550-pmic-glink", .data = &pmic_glink_sm8450_client_mask }, 371 { .compatible = "qcom,pmic-glink" }, 372 {} 373 }; 374 MODULE_DEVICE_TABLE(of, pmic_glink_of_match); 375 376 static struct platform_driver pmic_glink_driver = { 377 .probe = pmic_glink_probe, 378 .remove = pmic_glink_remove, 379 .driver = { 380 .name = "qcom_pmic_glink", 381 .of_match_table = pmic_glink_of_match, 382 }, 383 }; 384 385 static int pmic_glink_init(void) 386 { 387 int ret; 388 389 ret = platform_driver_register(&pmic_glink_driver); 390 if (ret < 0) 391 return ret; 392 393 ret = register_rpmsg_driver(&pmic_glink_rpmsg_driver); 394 if (ret < 0) { 395 platform_driver_unregister(&pmic_glink_driver); 396 return ret; 397 } 398 399 return 0; 400 }; 401 module_init(pmic_glink_init); 402 403 static void pmic_glink_exit(void) 404 { 405 unregister_rpmsg_driver(&pmic_glink_rpmsg_driver); 406 platform_driver_unregister(&pmic_glink_driver); 407 }; 408 module_exit(pmic_glink_exit); 409 410 MODULE_DESCRIPTION("Qualcomm PMIC GLINK driver"); 411 MODULE_LICENSE("GPL"); 412