drivers/hwmon/occ/p9_sbe.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 // Copyright IBM Corp 2019
   3
   4 #include <linux/device.h>
   5 #include <linux/errno.h>
   6 #include <linux/fsi-occ.h>
   7 #include <linux/module.h>
   8 #include <linux/platform_device.h>
   9
  10 #include "common.h"
  11
  12 struct p9_sbe_occ {
  13         struct occ occ;
  14         struct device *sbe;
  15 };
  16
  17 #define to_p9_sbe_occ(x)        container_of((x), struct p9_sbe_occ, occ)
  18
  19 static int p9_sbe_occ_send_cmd(struct occ *occ, u8 *cmd)
  20 {
  21         struct occ_response *resp = &occ->resp;
  22         struct p9_sbe_occ *ctx = to_p9_sbe_occ(occ);
  23         size_t resp_len = sizeof(*resp);
  24         int rc;
  25
  26         rc = fsi_occ_submit(ctx->sbe, cmd, 8, resp, &resp_len);
  27         if (rc < 0)
  28                 return rc;
  29
  30         switch (resp->return_status) {
  31         case OCC_RESP_CMD_IN_PRG:
  32                 rc = -ETIMEDOUT;
  33                 break;
  34         case OCC_RESP_SUCCESS:
  35                 rc = 0;
  36                 break;
  37         case OCC_RESP_CMD_INVAL:
  38         case OCC_RESP_CMD_LEN_INVAL:
  39         case OCC_RESP_DATA_INVAL:
  40         case OCC_RESP_CHKSUM_ERR:
  41                 rc = -EINVAL;
  42                 break;
  43         case OCC_RESP_INT_ERR:
  44         case OCC_RESP_BAD_STATE:
  45         case OCC_RESP_CRIT_EXCEPT:
  46         case OCC_RESP_CRIT_INIT:
  47         case OCC_RESP_CRIT_WATCHDOG:
  48         case OCC_RESP_CRIT_OCB:
  49         case OCC_RESP_CRIT_HW:
  50                 rc = -EREMOTEIO;
  51                 break;
  52         default:
  53                 rc = -EPROTO;
  54         }
  55
  56         return rc;
  57 }
  58
  59 static int p9_sbe_occ_probe(struct platform_device *pdev)
  60 {
  61         int rc;
  62         struct occ *occ;
  63         struct p9_sbe_occ *ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx),
  64                                               GFP_KERNEL);
  65         if (!ctx)
  66                 return -ENOMEM;
  67
  68         ctx->sbe = pdev->dev.parent;
  69         occ = &ctx->occ;
  70         occ->bus_dev = &pdev->dev;
  71         platform_set_drvdata(pdev, occ);
  72
  73         occ->powr_sample_time_us = 500;
  74         occ->poll_cmd_data = 0x20;              /* P9 OCC poll data */
  75         occ->send_cmd = p9_sbe_occ_send_cmd;
  76
  77         rc = occ_setup(occ, "p9_occ");
  78         if (rc == -ESHUTDOWN)
  79                 rc = -ENODEV;   /* Host is shutdown, don't spew errors */
  80
  81         return rc;
  82 }
  83
  84 static int p9_sbe_occ_remove(struct platform_device *pdev)
  85 {
  86         struct occ *occ = platform_get_drvdata(pdev);
  87         struct p9_sbe_occ *ctx = to_p9_sbe_occ(occ);
  88
  89         ctx->sbe = NULL;
  90         occ_shutdown(occ);
  91
  92         return 0;
  93 }
  94
  95 static struct platform_driver p9_sbe_occ_driver = {
  96         .driver = {
  97                 .name = "occ-hwmon",
  98         },
  99         .probe  = p9_sbe_occ_probe,
 100         .remove = p9_sbe_occ_remove,
 101 };
 102
 103 module_platform_driver(p9_sbe_occ_driver);
 104
 105 MODULE_AUTHOR("Eddie James <eajames@linux.ibm.com>");
 106 MODULE_DESCRIPTION("BMC P9 OCC hwmon driver");
 107 MODULE_LICENSE("GPL");