drivers/usb/typec/ucsi/ucsi_glink.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2019-2020, The Linux Foundation. All rights reserved.
   4  * Copyright (c) 2023, Linaro Ltd
   5  */
   6 #include <linux/auxiliary_bus.h>
   7 #include <linux/module.h>
   8 #include <linux/mutex.h>
   9 #include <linux/of_device.h>
  10 #include <linux/property.h>
  11 #include <linux/soc/qcom/pdr.h>
  12 #include <linux/usb/typec_mux.h>
  13 #include <linux/gpio/consumer.h>
  14 #include <linux/soc/qcom/pmic_glink.h>
  15 #include "ucsi.h"
  16
  17 #define PMIC_GLINK_MAX_PORTS    2
  18
  19 #define UCSI_BUF_SIZE                   48
  20
  21 #define MSG_TYPE_REQ_RESP               1
  22 #define UCSI_BUF_SIZE                   48
  23
  24 #define UC_NOTIFY_RECEIVER_UCSI         0x0
  25 #define UC_UCSI_READ_BUF_REQ            0x11
  26 #define UC_UCSI_WRITE_BUF_REQ           0x12
  27 #define UC_UCSI_USBC_NOTIFY_IND         0x13
  28
  29 struct ucsi_read_buf_req_msg {
  30         struct pmic_glink_hdr   hdr;
  31 };
  32
  33 struct ucsi_read_buf_resp_msg {
  34         struct pmic_glink_hdr   hdr;
  35         u8                      buf[UCSI_BUF_SIZE];
  36         u32                     ret_code;
  37 };
  38
  39 struct ucsi_write_buf_req_msg {
  40         struct pmic_glink_hdr   hdr;
  41         u8                      buf[UCSI_BUF_SIZE];
  42         u32                     reserved;
  43 };
  44
  45 struct ucsi_write_buf_resp_msg {
  46         struct pmic_glink_hdr   hdr;
  47         u32                     ret_code;
  48 };
  49
  50 struct ucsi_notify_ind_msg {
  51         struct pmic_glink_hdr   hdr;
  52         u32                     notification;
  53         u32                     receiver;
  54         u32                     reserved;
  55 };
  56
  57 struct pmic_glink_ucsi {
  58         struct device *dev;
  59
  60         struct gpio_desc *port_orientation[PMIC_GLINK_MAX_PORTS];
  61         struct typec_switch *port_switch[PMIC_GLINK_MAX_PORTS];
  62
  63         struct pmic_glink_client *client;
  64
  65         struct ucsi *ucsi;
  66         struct completion read_ack;
  67         struct completion write_ack;
  68         struct completion sync_ack;
  69         bool sync_pending;
  70         struct mutex lock;      /* protects concurrent access to PMIC Glink interface */
  71
  72         int sync_val;
  73
  74         struct work_struct notify_work;
  75         struct work_struct register_work;
  76
  77         u8 read_buf[UCSI_BUF_SIZE];
  78 };
  79
  80 static int pmic_glink_ucsi_read(struct ucsi *__ucsi, unsigned int offset,
  81                                 void *val, size_t val_len)
  82 {
  83         struct pmic_glink_ucsi *ucsi = ucsi_get_drvdata(__ucsi);
  84         struct ucsi_read_buf_req_msg req = {};
  85         unsigned long left;
  86         int ret;
  87
  88         req.hdr.owner = PMIC_GLINK_OWNER_USBC;
  89         req.hdr.type = MSG_TYPE_REQ_RESP;
  90         req.hdr.opcode = UC_UCSI_READ_BUF_REQ;
  91
  92         mutex_lock(&ucsi->lock);
  93         memset(ucsi->read_buf, 0, sizeof(ucsi->read_buf));
  94         reinit_completion(&ucsi->read_ack);
  95
  96         ret = pmic_glink_send(ucsi->client, &req, sizeof(req));
  97         if (ret < 0) {
  98                 dev_err(ucsi->dev, "failed to send UCSI read request: %d\n", ret);
  99                 goto out_unlock;
 100         }
 101
 102         left = wait_for_completion_timeout(&ucsi->read_ack, 5 * HZ);
 103         if (!left) {
 104                 dev_err(ucsi->dev, "timeout waiting for UCSI read response\n");
 105                 ret = -ETIMEDOUT;
 106                 goto out_unlock;
 107         }
 108
 109         memcpy(val, &ucsi->read_buf[offset], val_len);
 110         ret = 0;
 111
 112 out_unlock:
 113         mutex_unlock(&ucsi->lock);
 114
 115         return ret;
 116 }
 117
 118 static int pmic_glink_ucsi_locked_write(struct pmic_glink_ucsi *ucsi, unsigned int offset,
 119                                         const void *val, size_t val_len)
 120 {
 121         struct ucsi_write_buf_req_msg req = {};
 122         unsigned long left;
 123         int ret;
 124
 125         req.hdr.owner = PMIC_GLINK_OWNER_USBC;
 126         req.hdr.type = MSG_TYPE_REQ_RESP;
 127         req.hdr.opcode = UC_UCSI_WRITE_BUF_REQ;
 128         memcpy(&req.buf[offset], val, val_len);
 129
 130         reinit_completion(&ucsi->write_ack);
 131
 132         ret = pmic_glink_send(ucsi->client, &req, sizeof(req));
 133         if (ret < 0) {
 134                 dev_err(ucsi->dev, "failed to send UCSI write request: %d\n", ret);
 135                 return ret;
 136         }
 137
 138         left = wait_for_completion_timeout(&ucsi->write_ack, 5 * HZ);
 139         if (!left) {
 140                 dev_err(ucsi->dev, "timeout waiting for UCSI write response\n");
 141                 return -ETIMEDOUT;
 142         }
 143
 144         return 0;
 145 }
 146
 147 static int pmic_glink_ucsi_async_write(struct ucsi *__ucsi, unsigned int offset,
 148                                        const void *val, size_t val_len)
 149 {
 150         struct pmic_glink_ucsi *ucsi = ucsi_get_drvdata(__ucsi);
 151         int ret;
 152
 153         mutex_lock(&ucsi->lock);
 154         ret = pmic_glink_ucsi_locked_write(ucsi, offset, val, val_len);
 155         mutex_unlock(&ucsi->lock);
 156
 157         return ret;
 158 }
 159
 160 static int pmic_glink_ucsi_sync_write(struct ucsi *__ucsi, unsigned int offset,
 161                                       const void *val, size_t val_len)
 162 {
 163         struct pmic_glink_ucsi *ucsi = ucsi_get_drvdata(__ucsi);
 164         unsigned long left;
 165         int ret;
 166
 167         /* TOFIX: Downstream forces recipient to CON when UCSI_GET_ALTERNATE_MODES command */
 168
 169         mutex_lock(&ucsi->lock);
 170         ucsi->sync_val = 0;
 171         reinit_completion(&ucsi->sync_ack);
 172         ucsi->sync_pending = true;
 173         ret = pmic_glink_ucsi_locked_write(ucsi, offset, val, val_len);
 174         mutex_unlock(&ucsi->lock);
 175
 176         left = wait_for_completion_timeout(&ucsi->sync_ack, 5 * HZ);
 177         if (!left) {
 178                 dev_err(ucsi->dev, "timeout waiting for UCSI sync write response\n");
 179                 ret = -ETIMEDOUT;
 180         } else if (ucsi->sync_val) {
 181                 dev_err(ucsi->dev, "sync write returned: %d\n", ucsi->sync_val);
 182         }
 183
 184         ucsi->sync_pending = false;
 185
 186         return ret;
 187 }
 188
 189 static const struct ucsi_operations pmic_glink_ucsi_ops = {
 190         .read = pmic_glink_ucsi_read,
 191         .sync_write = pmic_glink_ucsi_sync_write,
 192         .async_write = pmic_glink_ucsi_async_write
 193 };
 194
 195 static void pmic_glink_ucsi_read_ack(struct pmic_glink_ucsi *ucsi, const void *data, int len)
 196 {
 197         const struct ucsi_read_buf_resp_msg *resp = data;
 198
 199         if (resp->ret_code)
 200                 return;
 201
 202         memcpy(ucsi->read_buf, resp->buf, UCSI_BUF_SIZE);
 203         complete(&ucsi->read_ack);
 204 }
 205
 206 static void pmic_glink_ucsi_write_ack(struct pmic_glink_ucsi *ucsi, const void *data, int len)
 207 {
 208         const struct ucsi_write_buf_resp_msg *resp = data;
 209
 210         if (resp->ret_code)
 211                 return;
 212
 213         ucsi->sync_val = resp->ret_code;
 214         complete(&ucsi->write_ack);
 215 }
 216
 217 static void pmic_glink_ucsi_notify(struct work_struct *work)
 218 {
 219         struct pmic_glink_ucsi *ucsi = container_of(work, struct pmic_glink_ucsi, notify_work);
 220         unsigned int con_num;
 221         u32 cci;
 222         int ret;
 223
 224         ret = pmic_glink_ucsi_read(ucsi->ucsi, UCSI_CCI, &cci, sizeof(cci));
 225         if (ret) {
 226                 dev_err(ucsi->dev, "failed to read CCI on notification\n");
 227                 return;
 228         }
 229
 230         con_num = UCSI_CCI_CONNECTOR(cci);
 231         if (con_num) {
 232                 if (con_num <= PMIC_GLINK_MAX_PORTS &&
 233                     ucsi->port_orientation[con_num - 1]) {
 234                         int orientation = gpiod_get_value(ucsi->port_orientation[con_num - 1]);
 235
 236                         if (orientation >= 0) {
 237                                 typec_switch_set(ucsi->port_switch[con_num - 1],
 238                                                  orientation ? TYPEC_ORIENTATION_REVERSE
 239                                                              : TYPEC_ORIENTATION_NORMAL);
 240                         }
 241                 }
 242
 243                 ucsi_connector_change(ucsi->ucsi, con_num);
 244         }
 245
 246         if (ucsi->sync_pending && cci & UCSI_CCI_BUSY) {
 247                 ucsi->sync_val = -EBUSY;
 248                 complete(&ucsi->sync_ack);
 249         } else if (ucsi->sync_pending &&
 250                    (cci & (UCSI_CCI_ACK_COMPLETE | UCSI_CCI_COMMAND_COMPLETE))) {
 251                 complete(&ucsi->sync_ack);
 252         }
 253 }
 254
 255 static void pmic_glink_ucsi_register(struct work_struct *work)
 256 {
 257         struct pmic_glink_ucsi *ucsi = container_of(work, struct pmic_glink_ucsi, register_work);
 258
 259         ucsi_register(ucsi->ucsi);
 260 }
 261
 262 static void pmic_glink_ucsi_callback(const void *data, size_t len, void *priv)
 263 {
 264         struct pmic_glink_ucsi *ucsi = priv;
 265         const struct pmic_glink_hdr *hdr = data;
 266
 267         switch (le32_to_cpu(hdr->opcode)) {
 268         case UC_UCSI_READ_BUF_REQ:
 269                 pmic_glink_ucsi_read_ack(ucsi, data, len);
 270                 break;
 271         case UC_UCSI_WRITE_BUF_REQ:
 272                 pmic_glink_ucsi_write_ack(ucsi, data, len);
 273                 break;
 274         case UC_UCSI_USBC_NOTIFY_IND:
 275                 schedule_work(&ucsi->notify_work);
 276                 break;
 277         };
 278 }
 279
 280 static void pmic_glink_ucsi_pdr_notify(void *priv, int state)
 281 {
 282         struct pmic_glink_ucsi *ucsi = priv;
 283
 284         if (state == SERVREG_SERVICE_STATE_UP)
 285                 schedule_work(&ucsi->register_work);
 286         else if (state == SERVREG_SERVICE_STATE_DOWN)
 287                 ucsi_unregister(ucsi->ucsi);
 288 }
 289
 290 static void pmic_glink_ucsi_destroy(void *data)
 291 {
 292         struct pmic_glink_ucsi *ucsi = data;
 293
 294         /* Protect to make sure we're not in a middle of a transaction from a glink callback */
 295         mutex_lock(&ucsi->lock);
 296         ucsi_destroy(ucsi->ucsi);
 297         mutex_unlock(&ucsi->lock);
 298 }
 299
 300 static const struct of_device_id pmic_glink_ucsi_of_quirks[] = {
 301         { .compatible = "qcom,qcm6490-pmic-glink", .data = (void *)UCSI_NO_PARTNER_PDOS, },
 302         { .compatible = "qcom,sc8180x-pmic-glink", .data = (void *)UCSI_NO_PARTNER_PDOS, },
 303         { .compatible = "qcom,sc8280xp-pmic-glink", .data = (void *)UCSI_NO_PARTNER_PDOS, },
 304         { .compatible = "qcom,sm8350-pmic-glink", .data = (void *)UCSI_NO_PARTNER_PDOS, },
 305         { .compatible = "qcom,sm8550-pmic-glink", .data = (void *)UCSI_NO_PARTNER_PDOS, },
 306         {}
 307 };
 308
 309 static int pmic_glink_ucsi_probe(struct auxiliary_device *adev,
 310                                  const struct auxiliary_device_id *id)
 311 {
 312         struct pmic_glink_ucsi *ucsi;
 313         struct device *dev = &adev->dev;
 314         const struct of_device_id *match;
 315         struct fwnode_handle *fwnode;
 316         int ret;
 317
 318         ucsi = devm_kzalloc(dev, sizeof(*ucsi), GFP_KERNEL);
 319         if (!ucsi)
 320                 return -ENOMEM;
 321
 322         ucsi->dev = dev;
 323         dev_set_drvdata(dev, ucsi);
 324
 325         INIT_WORK(&ucsi->notify_work, pmic_glink_ucsi_notify);
 326         INIT_WORK(&ucsi->register_work, pmic_glink_ucsi_register);
 327         init_completion(&ucsi->read_ack);
 328         init_completion(&ucsi->write_ack);
 329         init_completion(&ucsi->sync_ack);
 330         mutex_init(&ucsi->lock);
 331
 332         ucsi->ucsi = ucsi_create(dev, &pmic_glink_ucsi_ops);
 333         if (IS_ERR(ucsi->ucsi))
 334                 return PTR_ERR(ucsi->ucsi);
 335
 336         /* Make sure we destroy *after* pmic_glink unregister */
 337         ret = devm_add_action_or_reset(dev, pmic_glink_ucsi_destroy, ucsi);
 338         if (ret)
 339                 return ret;
 340
 341         match = of_match_device(pmic_glink_ucsi_of_quirks, dev->parent);
 342         if (match)
 343                 ucsi->ucsi->quirks = (unsigned long)match->data;
 344
 345         ucsi_set_drvdata(ucsi->ucsi, ucsi);
 346
 347         device_for_each_child_node(dev, fwnode) {
 348                 struct gpio_desc *desc;
 349                 u32 port;
 350
 351                 ret = fwnode_property_read_u32(fwnode, "reg", &port);
 352                 if (ret < 0) {
 353                         dev_err(dev, "missing reg property of %pOFn\n", fwnode);
 354                         return ret;
 355                 }
 356
 357                 if (port >= PMIC_GLINK_MAX_PORTS) {
 358                         dev_warn(dev, "invalid connector number, ignoring\n");
 359                         continue;
 360                 }
 361
 362                 desc = devm_gpiod_get_index_optional(&adev->dev, "orientation", port, GPIOD_IN);
 363
 364                 /* If GPIO isn't found, continue */
 365                 if (!desc)
 366                         continue;
 367
 368                 if (IS_ERR(desc))
 369                         return dev_err_probe(dev, PTR_ERR(desc),
 370                                              "unable to acquire orientation gpio\n");
 371                 ucsi->port_orientation[port] = desc;
 372
 373                 ucsi->port_switch[port] = fwnode_typec_switch_get(fwnode);
 374                 if (IS_ERR(ucsi->port_switch[port]))
 375                         return dev_err_probe(dev, PTR_ERR(ucsi->port_switch[port]),
 376                                         "failed to acquire orientation-switch\n");
 377         }
 378
 379         ucsi->client = devm_pmic_glink_register_client(dev,
 380                                                        PMIC_GLINK_OWNER_USBC,
 381                                                        pmic_glink_ucsi_callback,
 382                                                        pmic_glink_ucsi_pdr_notify,
 383                                                        ucsi);
 384         return PTR_ERR_OR_ZERO(ucsi->client);
 385 }
 386
 387 static void pmic_glink_ucsi_remove(struct auxiliary_device *adev)
 388 {
 389         struct pmic_glink_ucsi *ucsi = dev_get_drvdata(&adev->dev);
 390
 391         /* Unregister first to stop having read & writes */
 392         ucsi_unregister(ucsi->ucsi);
 393 }
 394
 395 static const struct auxiliary_device_id pmic_glink_ucsi_id_table[] = {
 396         { .name = "pmic_glink.ucsi", },
 397         {},
 398 };
 399 MODULE_DEVICE_TABLE(auxiliary, pmic_glink_ucsi_id_table);
 400
 401 static struct auxiliary_driver pmic_glink_ucsi_driver = {
 402         .name = "pmic_glink_ucsi",
 403         .probe = pmic_glink_ucsi_probe,
 404         .remove = pmic_glink_ucsi_remove,
 405         .id_table = pmic_glink_ucsi_id_table,
 406 };
 407
 408 module_auxiliary_driver(pmic_glink_ucsi_driver);
 409
 410 MODULE_DESCRIPTION("Qualcomm PMIC GLINK UCSI driver");
 411 MODULE_LICENSE("GPL");