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authorEddie James <eajames@linux.vnet.ibm.com>2018-11-08 22:05:24 +0100
committerGuenter Roeck <linux@roeck-us.net>2018-12-17 00:13:05 +0100
commit5b5513b8800291226a8fa63fd22a14cc235b313e (patch)
tree7d588b3a229db7316304324340f36b654f278c5b /drivers/hwmon/occ/p9_sbe.c
parentdt-bindings: i2c: Add P8 OCC hwmon device documentation (diff)
downloadlinux-5b5513b8800291226a8fa63fd22a14cc235b313e.tar.xz
linux-5b5513b8800291226a8fa63fd22a14cc235b313e.zip
hwmon: Add On-Chip Controller (OCC) hwmon driver
The OCC is a device embedded on a POWER processor that collects and aggregates sensor data from the processor and system. The OCC can provide the raw sensor data as well as perform thermal and power management on the system. This driver provides a hwmon interface to the OCC from a service processor (e.g. a BMC). The driver supports both POWER8 and POWER9 OCCs. Communications with the POWER8 OCC are established over standard I2C bus. The driver communicates with the POWER9 OCC through the FSI-based OCC driver, which handles the lower-level communication details. This patch lays out the structure of the OCC hwmon driver. There are two platform drivers, one each for P8 and P9 OCCs. These are probed through the I2C tree and the FSI-based OCC driver, respectively. The patch also defines the first common structures and methods between the two OCC versions. Signed-off-by: Eddie James <eajames@linux.ibm.com> [groeck: Fix up SPDX license identifier] Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to '')
-rw-r--r--drivers/hwmon/occ/p9_sbe.c68
1 files changed, 68 insertions, 0 deletions
diff --git a/drivers/hwmon/occ/p9_sbe.c b/drivers/hwmon/occ/p9_sbe.c
new file mode 100644
index 000000000000..c2fa34e30544
--- /dev/null
+++ b/drivers/hwmon/occ/p9_sbe.c
@@ -0,0 +1,68 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/device.h>
+#include <linux/errno.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)
+{
+ return -EOPNOTSUPP;
+}
+
+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->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;
+
+ 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");