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Subject[ v2] hwmon: (pmbus) Add Wistron power supply pmbus driver
Date
Add the driver to monitor Wisreon power supplies with hwmon over pmbus.

Signed-off-by: Ben Pai <Ben_Pai@wistron.com>
---
.../devicetree/bindings/hwmon/wistron-wps.txt | 30 +++
drivers/hwmon/pmbus/Kconfig | 9 +
drivers/hwmon/pmbus/Makefile | 1 +
drivers/hwmon/pmbus/wistron-wps.c | 176 ++++++++++++++++++
4 files changed, 216 insertions(+)
create mode 100644 Documentation/devicetree/bindings/hwmon/wistron-wps.txt
create mode 100644 drivers/hwmon/pmbus/wistron-wps.c

diff --git a/Documentation/devicetree/bindings/hwmon/wistron-wps.txt b/Documentation/devicetree/bindings/hwmon/wistron-wps.txt
new file mode 100644
index 000000000000..aacb2e66736e
--- /dev/null
+++ b/Documentation/devicetree/bindings/hwmon/wistron-wps.txt
@@ -0,0 +1,30 @@
+ver ibm-cffps
+=======================
+
+Supported chips:
+
+ * Wistron Common Form Factor power supply(wps).
+
+Author: Ben Pai <Ben_Pai@wistron.com>
+
+Description
+-----------
+
+Our company name is Wistron, so this driver is written to supports
+Wistron Common Form Factor power supplies(wps). This driver
+is a client to the core PMBus driver. Read information from psu,
+and create debug-files and write information to them via driver.
+
+Usage Notes
+-----------
+
+This driver does not auto-detect devices. You will have to instantiate the
+devices explicitly. Please see Documentation/i2c/instantiating-devices for
+details.
+
+Information of the data read
+---------------------
+FRU : name of psu manufacturer.
+PN : part_number of psu.
+SN : serial_number of psu.
+mfr_date : Date of psu's manufacture.
diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index d62d69bb7e49..ebb7024e58ab 100644
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -219,6 +219,15 @@ config SENSORS_UCD9200
This driver can also be built as a module. If so, the module will
be called ucd9200.

+config SENSORS_WISTRON_WPS
+ tristate "Wistron Power Supply"
+ help
+ If you say yes here you get hardware monitoring support for the Wistron
+ power supply.
+
+ This driver can also be built as a module. If so, the module will
+ be called wistron-wps.
+
config SENSORS_ZL6100
tristate "Intersil ZL6100 and compatibles"
help
diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
index 03bacfcfd660..cad38f99e8c5 100644
--- a/drivers/hwmon/pmbus/Makefile
+++ b/drivers/hwmon/pmbus/Makefile
@@ -25,4 +25,5 @@ obj-$(CONFIG_SENSORS_TPS40422) += tps40422.o
obj-$(CONFIG_SENSORS_TPS53679) += tps53679.o
obj-$(CONFIG_SENSORS_UCD9000) += ucd9000.o
obj-$(CONFIG_SENSORS_UCD9200) += ucd9200.o
+obj-$(CONFIG_SENSORS_WISTRON_WPS) += wistron-wps.o
obj-$(CONFIG_SENSORS_ZL6100) += zl6100.o
diff --git a/drivers/hwmon/pmbus/wistron-wps.c b/drivers/hwmon/pmbus/wistron-wps.c
new file mode 100644
index 000000000000..4e2649e7b3f2
--- /dev/null
+++ b/drivers/hwmon/pmbus/wistron-wps.c
@@ -0,0 +1,176 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright 2019 Wistron Corp.
+ */
+
+#include <linux/bitops.h>
+#include <linux/debugfs.h>
+#include <linux/device.h>
+#include <linux/fs.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/pmbus.h>
+
+#include "pmbus.h"
+
+#define WPS_FRU_CMD 0x99
+#define WPS_PN_CMD 0x9A
+#define WPS_FW_CMD 0x9B
+#define WPS_DATE_CMD 0x9D
+#define WPS_SN_CMD 0x9E
+
+enum {
+ WPS_DEBUGFS_FRU,
+ WPS_DEBUGFS_PN,
+ WPS_DEBUGFS_SN,
+ WPS_DEBUGFS_FW,
+ WPS_DEBUGFS_DATE,
+ WPS_DEBUGFS_NUM_ENTRIES
+};
+
+struct wistron_wps {
+ struct i2c_client *client;
+ int debugfs_entries[WPS_DEBUGFS_NUM_ENTRIES];
+};
+
+#define to_psu(x, y) container_of(x, struct wistron_wps, debugfs_entries[y])
+
+static ssize_t wistron_wps_debugfs_op(struct file *file, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ u8 cmd;
+ int rc;
+ int *idxp = file->private_data;
+ int idx = *idxp;
+ struct wistron_wps *psu = to_psu(idxp, idx);
+ char data[I2C_SMBUS_BLOCK_MAX] = { 0 };
+
+ pmbus_set_page(psu->client, 0);
+ switch (idx) {
+ case WPS_DEBUGFS_FRU:
+ cmd = WPS_FRU_CMD;
+ break;
+ case WPS_DEBUGFS_PN:
+ cmd = WPS_PN_CMD;
+ break;
+ case WPS_DEBUGFS_SN:
+ cmd = WPS_SN_CMD;
+ break;
+ case WPS_DEBUGFS_FW:
+ cmd = WPS_FW_CMD;
+ break;
+ case WPS_DEBUGFS_DATE:
+ cmd = WPS_DATE_CMD;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ rc = i2c_smbus_read_block_data(psu->client, cmd, data);
+ if (rc < 0)
+ return rc;
+
+done:
+ data[rc] = '\n';
+ rc += 2;
+
+ return simple_read_from_buffer(buf, count, ppos, data, rc);
+}
+
+static const struct file_operations wistron_wps_fops = {
+
+ .llseek = noop_llseek,
+ .read = wistron_wps_debugfs_op,
+ .open = simple_open,
+};
+
+static struct pmbus_driver_info wistron_wps_info = {
+ .pages = 1,
+ .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |
+ PMBUS_HAVE_PIN | PMBUS_HAVE_POUT | PMBUS_HAVE_FAN12 |
+ PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 |
+ PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT |
+ PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP |
+ PMBUS_HAVE_STATUS_FAN12,
+};
+
+static struct pmbus_platform_data wistron_wps_pdata = {
+ .flags = PMBUS_SKIP_STATUS_CHECK,
+};
+
+static int wistron_wps_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ int i, rc;
+ struct dentry *debugfs;
+ struct dentry *wistron_wps_dir;
+ struct wistron_wps *psu;
+
+ client->dev.platform_data = &wistron_wps_pdata;
+ rc = pmbus_do_probe(client, id, &wistron_wps_info);
+ if (rc)
+ return rc;
+
+ psu = devm_kzalloc(&client->dev, sizeof(*psu), GFP_KERNEL);
+ if (!psu)
+ return 0;
+
+ psu->client = client;
+
+ debugfs = pmbus_get_debugfs_dir(client);
+ if (!debugfs)
+ return 0;
+
+ wistron_wps_dir = debugfs_create_dir(client->name, debugfs);
+ if (!wistron_wps_dir)
+ return 0;
+
+ for (i = 0; i < WPS_DEBUGFS_NUM_ENTRIES; ++i)
+ psu->debugfs_entries[i] = i;
+
+ debugfs_create_file("fru", 0444, wistron_wps_dir,
+ &psu->debugfs_entries[WPS_DEBUGFS_FRU],
+ &wistron_wps_fops);
+ debugfs_create_file("part_number", 0444, wistron_wps_dir,
+ &psu->debugfs_entries[WPS_DEBUGFS_PN],
+ &wistron_wps_fops);
+ debugfs_create_file("serial_number", 0444, wistron_wps_dir,
+ &psu->debugfs_entries[WPS_DEBUGFS_SN],
+ &wistron_wps_fops);
+ debugfs_create_file("fw_version", 0444, wistron_wps_dir,
+ &psu->debugfs_entries[WPS_DEBUGFS_FW],
+ &wistron_wps_fops);
+ debugfs_create_file("mfr_date", 0444, wistron_wps_dir,
+ &psu->debugfs_entries[WPS_DEBUGFS_DATE],
+ &wistron_wps_fops);
+
+ return 0;
+}
+
+static const struct i2c_device_id wistron_wps_id[] = {
+ { "wistron_wps", 1 },
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, wistron_wps_id);
+
+static const struct of_device_id wistron_wps_of_match[] = {
+ { .compatible = "wistron, wps" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, wistron_wps_of_match);
+
+static struct i2c_driver wistron_wps_driver = {
+ .driver = {
+ .name = "wistron-wps",
+ .of_match_table = wistron_wps_of_match,
+ },
+ .probe = wistron_wps_probe,
+ .remove = pmbus_do_remove,
+ .id_table = wistron_wps_id,
+};
+
+module_i2c_driver(wistron_wps_driver);
+
+MODULE_AUTHOR("Ben Pai");
+MODULE_DESCRIPTION("PMBus driver for Wistron power supplies");
+MODULE_LICENSE("GPL");
--
2.17.1
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