1 files changed, 107 insertions, 0 deletions
diff --git a/drivers/hwmon/occ/p9_sbe.c b/drivers/hwmon/occ/p9_sbe.c
new file mode 100644
index 000000000..f6387cc0b
--- /dev/null
+++ b/drivers/hwmon/occ/p9_sbe.c
@@ -0,0 +1,107 @@
+// SPDX-License-Identifier: GPL-2.0+
+// Copyright IBM Corp 2019
+
+#include <linux/device.h>
+#include <linux/errno.h>
+#include <linux/fsi-occ.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#include "common.h"
+
+struct p9_sbe_occ {
+	struct occ occ;
+	struct device *sbe;
+};
+
+#define to_p9_sbe_occ(x)	container_of((x), struct p9_sbe_occ, occ)
+
+static int p9_sbe_occ_send_cmd(struct occ *occ, u8 *cmd)
+{
+	struct occ_response *resp = &occ->resp;
+	struct p9_sbe_occ *ctx = to_p9_sbe_occ(occ);
+	size_t resp_len = sizeof(*resp);
+	int rc;
+
+	rc = fsi_occ_submit(ctx->sbe, cmd, 8, resp, &resp_len);
+	if (rc < 0)
+		return rc;
+
+	switch (resp->return_status) {
+	case OCC_RESP_CMD_IN_PRG:
+		rc = -ETIMEDOUT;
+		break;
+	case OCC_RESP_SUCCESS:
+		rc = 0;
+		break;
+	case OCC_RESP_CMD_INVAL:
+	case OCC_RESP_CMD_LEN_INVAL:
+	case OCC_RESP_DATA_INVAL:
+	case OCC_RESP_CHKSUM_ERR:
+		rc = -EINVAL;
+		break;
+	case OCC_RESP_INT_ERR:
+	case OCC_RESP_BAD_STATE:
+	case OCC_RESP_CRIT_EXCEPT:
+	case OCC_RESP_CRIT_INIT:
+	case OCC_RESP_CRIT_WATCHDOG:
+	case OCC_RESP_CRIT_OCB:
+	case OCC_RESP_CRIT_HW:
+		rc = -EREMOTEIO;
+		break;
+	default:
+		rc = -EPROTO;
+	}
+
+	return rc;
+}
+
+static int p9_sbe_occ_probe(struct platform_device *pdev)
+{
+	int rc;
+	struct occ *occ;
+	struct p9_sbe_occ *ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx),
+					      GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+
+	ctx->sbe = pdev->dev.parent;
+	occ = &ctx->occ;
+	occ->bus_dev = &pdev->dev;
+	platform_set_drvdata(pdev, occ);
+
+	occ->powr_sample_time_us = 500;
+	occ->poll_cmd_data = 0x20;		/* P9 OCC poll data */
+	occ->send_cmd = p9_sbe_occ_send_cmd;
+
+	rc = occ_setup(occ, "p9_occ");
+	if (rc == -ESHUTDOWN)
+		rc = -ENODEV;	/* Host is shutdown, don't spew errors */
+
+	return rc;
+}
+
+static int p9_sbe_occ_remove(struct platform_device *pdev)
+{
+	struct occ *occ = platform_get_drvdata(pdev);
+	struct p9_sbe_occ *ctx = to_p9_sbe_occ(occ);
+
+	ctx->sbe = NULL;
+	occ_shutdown(occ);
+
+	return 0;
+}
+
+static struct platform_driver p9_sbe_occ_driver = {
+	.driver = {
+		.name = "occ-hwmon",
+	},
+	.probe	= p9_sbe_occ_probe,
+	.remove = p9_sbe_occ_remove,
+};
+
+module_platform_driver(p9_sbe_occ_driver);
+
+MODULE_AUTHOR("Eddie James <eajames@linux.ibm.com>");
+MODULE_DESCRIPTION("BMC P9 OCC hwmon driver");
+MODULE_LICENSE("GPL");