tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
12struct 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
19static 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
59static 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
84static 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
95static 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
103module_platform_driver(p9_sbe_occ_driver);
104
105MODULE_AUTHOR("Eddie James <eajames@linux.ibm.com>");
106MODULE_DESCRIPTION("BMC P9 OCC hwmon driver");
107MODULE_LICENSE("GPL");