drivers/platform/chrome/cros_usbpd_logger.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Logging driver for ChromeOS EC based USBPD Charger.
   4  *
   5  * Copyright 2018 Google LLC.
   6  */
   7
   8 #include <linux/ktime.h>
   9 #include <linux/mfd/cros_ec.h>
  10 #include <linux/math64.h>
  11 #include <linux/module.h>
  12 #include <linux/platform_data/cros_ec_commands.h>
  13 #include <linux/platform_data/cros_ec_proto.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/rtc.h>
  16
  17 #define DRV_NAME "cros-usbpd-logger"
  18
  19 #define CROS_USBPD_MAX_LOG_ENTRIES      30
  20 #define CROS_USBPD_LOG_UPDATE_DELAY     msecs_to_jiffies(60000)
  21 #define CROS_USBPD_DATA_SIZE            16
  22 #define CROS_USBPD_LOG_RESP_SIZE        (sizeof(struct ec_response_pd_log) + \
  23                                          CROS_USBPD_DATA_SIZE)
  24 #define CROS_USBPD_BUFFER_SIZE          (sizeof(struct cros_ec_command) + \
  25                                          CROS_USBPD_LOG_RESP_SIZE)
  26 /* Buffer for building the PDLOG string */
  27 #define BUF_SIZE        80
  28
  29 struct logger_data {
  30         struct device *dev;
  31         struct cros_ec_dev *ec_dev;
  32         u8 ec_buffer[CROS_USBPD_BUFFER_SIZE];
  33         struct delayed_work log_work;
  34         struct workqueue_struct *log_workqueue;
  35 };
  36
  37 static const char * const chg_type_names[] = {
  38         "None", "PD", "Type-C", "Proprietary", "DCP", "CDP", "SDP",
  39         "Other", "VBUS"
  40 };
  41
  42 static const char * const role_names[] = {
  43         "Disconnected", "SRC", "SNK", "SNK (not charging)"
  44 };
  45
  46 static const char * const fault_names[] = {
  47         "---", "OCP", "fast OCP", "OVP", "Discharge"
  48 };
  49
  50 static int append_str(char *buf, int pos, const char *fmt, ...)
  51 {
  52         va_list args;
  53         int i;
  54
  55         va_start(args, fmt);
  56         i = vsnprintf(buf + pos, BUF_SIZE - pos, fmt, args);
  57         va_end(args);
  58
  59         return i;
  60 }
  61
  62 static struct ec_response_pd_log *ec_get_log_entry(struct logger_data *logger)
  63 {
  64         struct cros_ec_dev *ec_dev = logger->ec_dev;
  65         struct cros_ec_command *msg;
  66         int ret;
  67
  68         msg = (struct cros_ec_command *)logger->ec_buffer;
  69
  70         msg->command = ec_dev->cmd_offset + EC_CMD_PD_GET_LOG_ENTRY;
  71         msg->insize = CROS_USBPD_LOG_RESP_SIZE;
  72
  73         ret = cros_ec_cmd_xfer_status(ec_dev->ec_dev, msg);
  74         if (ret < 0)
  75                 return ERR_PTR(ret);
  76
  77         return (struct ec_response_pd_log *)msg->data;
  78 }
  79
  80 static void cros_usbpd_print_log_entry(struct ec_response_pd_log *r,
  81                                        ktime_t tstamp)
  82 {
  83         const char *fault, *role, *chg_type;
  84         struct usb_chg_measures *meas;
  85         struct mcdp_info *minfo;
  86         int role_idx, type_idx;
  87         char buf[BUF_SIZE + 1];
  88         struct rtc_time rt;
  89         int len = 0;
  90         s32 rem;
  91         int i;
  92
  93         /* The timestamp is the number of 1024th of seconds in the past */
  94         tstamp = ktime_sub_us(tstamp, r->timestamp << PD_LOG_TIMESTAMP_SHIFT);
  95         rt = rtc_ktime_to_tm(tstamp);
  96
  97         switch (r->type) {
  98         case PD_EVENT_MCU_CHARGE:
  99                 if (r->data & CHARGE_FLAGS_OVERRIDE)
 100                         len += append_str(buf, len, "override ");
 101
 102                 if (r->data & CHARGE_FLAGS_DELAYED_OVERRIDE)
 103                         len += append_str(buf, len, "pending_override ");
 104
 105                 role_idx = r->data & CHARGE_FLAGS_ROLE_MASK;
 106                 role = role_idx < ARRAY_SIZE(role_names) ?
 107                         role_names[role_idx] : "Unknown";
 108
 109                 type_idx = (r->data & CHARGE_FLAGS_TYPE_MASK)
 110                          >> CHARGE_FLAGS_TYPE_SHIFT;
 111
 112                 chg_type = type_idx < ARRAY_SIZE(chg_type_names) ?
 113                         chg_type_names[type_idx] : "???";
 114
 115                 if (role_idx == USB_PD_PORT_POWER_DISCONNECTED ||
 116                     role_idx == USB_PD_PORT_POWER_SOURCE) {
 117                         len += append_str(buf, len, "%s", role);
 118                         break;
 119                 }
 120
 121                 meas = (struct usb_chg_measures *)r->payload;
 122                 len += append_str(buf, len, "%s %s %s %dmV max %dmV / %dmA",
 123                                   role, r->data & CHARGE_FLAGS_DUAL_ROLE ?
 124                                   "DRP" : "Charger",
 125                                   chg_type, meas->voltage_now,
 126                                   meas->voltage_max, meas->current_max);
 127                 break;
 128         case PD_EVENT_ACC_RW_FAIL:
 129                 len += append_str(buf, len, "RW signature check failed");
 130                 break;
 131         case PD_EVENT_PS_FAULT:
 132                 fault = r->data < ARRAY_SIZE(fault_names) ? fault_names[r->data]
 133                                                           : "???";
 134                 len += append_str(buf, len, "Power supply fault: %s", fault);
 135                 break;
 136         case PD_EVENT_VIDEO_DP_MODE:
 137                 len += append_str(buf, len, "DP mode %sabled", r->data == 1 ?
 138                                   "en" : "dis");
 139                 break;
 140         case PD_EVENT_VIDEO_CODEC:
 141                 minfo = (struct mcdp_info *)r->payload;
 142                 len += append_str(buf, len, "HDMI info: family:%04x chipid:%04x ",
 143                                   MCDP_FAMILY(minfo->family),
 144                                   MCDP_CHIPID(minfo->chipid));
 145                 len += append_str(buf, len, "irom:%d.%d.%d fw:%d.%d.%d",
 146                                   minfo->irom.major, minfo->irom.minor,
 147                                   minfo->irom.build, minfo->fw.major,
 148                                   minfo->fw.minor, minfo->fw.build);
 149                 break;
 150         default:
 151                 len += append_str(buf, len, "Event %02x (%04x) [", r->type,
 152                                   r->data);
 153
 154                 for (i = 0; i < PD_LOG_SIZE(r->size_port); i++)
 155                         len += append_str(buf, len, "%02x ", r->payload[i]);
 156
 157                 len += append_str(buf, len, "]");
 158                 break;
 159         }
 160
 161         div_s64_rem(ktime_to_ms(tstamp), MSEC_PER_SEC, &rem);
 162         pr_info("PDLOG %d/%02d/%02d %02d:%02d:%02d.%03d P%d %s\n",
 163                 rt.tm_year + 1900, rt.tm_mon + 1, rt.tm_mday,
 164                 rt.tm_hour, rt.tm_min, rt.tm_sec, rem,
 165                 PD_LOG_PORT(r->size_port), buf);
 166 }
 167
 168 static void cros_usbpd_log_check(struct work_struct *work)
 169 {
 170         struct logger_data *logger = container_of(to_delayed_work(work),
 171                                                   struct logger_data,
 172                                                   log_work);
 173         struct device *dev = logger->dev;
 174         struct ec_response_pd_log *r;
 175         int entries = 0;
 176         ktime_t now;
 177
 178         while (entries++ < CROS_USBPD_MAX_LOG_ENTRIES) {
 179                 r = ec_get_log_entry(logger);
 180                 now = ktime_get_real();
 181                 if (IS_ERR(r)) {
 182                         dev_dbg(dev, "Cannot get PD log %ld\n", PTR_ERR(r));
 183                         break;
 184                 }
 185                 if (r->type == PD_EVENT_NO_ENTRY)
 186                         break;
 187
 188                 cros_usbpd_print_log_entry(r, now);
 189         }
 190
 191         queue_delayed_work(logger->log_workqueue, &logger->log_work,
 192                            CROS_USBPD_LOG_UPDATE_DELAY);
 193 }
 194
 195 static int cros_usbpd_logger_probe(struct platform_device *pd)
 196 {
 197         struct cros_ec_dev *ec_dev = dev_get_drvdata(pd->dev.parent);
 198         struct device *dev = &pd->dev;
 199         struct logger_data *logger;
 200
 201         logger = devm_kzalloc(dev, sizeof(*logger), GFP_KERNEL);
 202         if (!logger)
 203                 return -ENOMEM;
 204
 205         logger->dev = dev;
 206         logger->ec_dev = ec_dev;
 207
 208         platform_set_drvdata(pd, logger);
 209
 210         /* Retrieve PD event logs periodically */
 211         INIT_DELAYED_WORK(&logger->log_work, cros_usbpd_log_check);
 212         logger->log_workqueue = create_singlethread_workqueue("cros_usbpd_log");
 213         if (!logger->log_workqueue)
 214                 return -ENOMEM;
 215
 216         queue_delayed_work(logger->log_workqueue, &logger->log_work,
 217                            CROS_USBPD_LOG_UPDATE_DELAY);
 218
 219         return 0;
 220 }
 221
 222 static int cros_usbpd_logger_remove(struct platform_device *pd)
 223 {
 224         struct logger_data *logger = platform_get_drvdata(pd);
 225
 226         cancel_delayed_work_sync(&logger->log_work);
 227
 228         return 0;
 229 }
 230
 231 static int __maybe_unused cros_usbpd_logger_resume(struct device *dev)
 232 {
 233         struct logger_data *logger = dev_get_drvdata(dev);
 234
 235         queue_delayed_work(logger->log_workqueue, &logger->log_work,
 236                            CROS_USBPD_LOG_UPDATE_DELAY);
 237
 238         return 0;
 239 }
 240
 241 static int __maybe_unused cros_usbpd_logger_suspend(struct device *dev)
 242 {
 243         struct logger_data *logger = dev_get_drvdata(dev);
 244
 245         cancel_delayed_work_sync(&logger->log_work);
 246
 247         return 0;
 248 }
 249
 250 static SIMPLE_DEV_PM_OPS(cros_usbpd_logger_pm_ops, cros_usbpd_logger_suspend,
 251                          cros_usbpd_logger_resume);
 252
 253 static struct platform_driver cros_usbpd_logger_driver = {
 254         .driver = {
 255                 .name = DRV_NAME,
 256                 .pm = &cros_usbpd_logger_pm_ops,
 257         },
 258         .probe = cros_usbpd_logger_probe,
 259         .remove = cros_usbpd_logger_remove,
 260 };
 261
 262 module_platform_driver(cros_usbpd_logger_driver);
 263
 264 MODULE_LICENSE("GPL v2");
 265 MODULE_DESCRIPTION("Logging driver for ChromeOS EC USBPD Charger.");
 266 MODULE_ALIAS("platform:" DRV_NAME);