inspur-ipsps.c

  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * Copyright 2019 Inspur Corp.
  4 */
  5
  6#include <linux/debugfs.h>
  7#include <linux/device.h>
  8#include <linux/fs.h>
  9#include <linux/i2c.h>
 10#include <linux/module.h>
 11#include <linux/pmbus.h>
 12#include <linux/hwmon-sysfs.h>
 13
 14#include "pmbus.h"
 15
 16#define IPSPS_REG_VENDOR_ID	0x99
 17#define IPSPS_REG_MODEL		0x9A
 18#define IPSPS_REG_FW_VERSION	0x9B
 19#define IPSPS_REG_PN		0x9C
 20#define IPSPS_REG_SN		0x9E
 21#define IPSPS_REG_HW_VERSION	0xB0
 22#define IPSPS_REG_MODE		0xFC
 23
 24#define MODE_ACTIVE		0x55
 25#define MODE_STANDBY		0x0E
 26#define MODE_REDUNDANCY		0x00
 27
 28#define MODE_ACTIVE_STRING		"active"
 29#define MODE_STANDBY_STRING		"standby"
 30#define MODE_REDUNDANCY_STRING		"redundancy"
 31
 32enum ipsps_index {
 33	vendor,
 34	model,
 35	fw_version,
 36	part_number,
 37	serial_number,
 38	hw_version,
 39	mode,
 40	num_regs,
 41};
 42
 43static const u8 ipsps_regs[num_regs] = {
 44	[vendor] = IPSPS_REG_VENDOR_ID,
 45	[model] = IPSPS_REG_MODEL,
 46	[fw_version] = IPSPS_REG_FW_VERSION,
 47	[part_number] = IPSPS_REG_PN,
 48	[serial_number] = IPSPS_REG_SN,
 49	[hw_version] = IPSPS_REG_HW_VERSION,
 50	[mode] = IPSPS_REG_MODE,
 51};
 52
 53static ssize_t ipsps_string_show(struct device *dev,
 54				 struct device_attribute *devattr,
 55				 char *buf)
 56{
 57	u8 reg;
 58	int rc;
 59	char *p;
 60	char data[I2C_SMBUS_BLOCK_MAX + 1];
 61	struct i2c_client *client = to_i2c_client(dev->parent);
 62	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 63
 64	reg = ipsps_regs[attr->index];
 65	rc = i2c_smbus_read_block_data(client, reg, data);
 66	if (rc < 0)
 67		return rc;
 68
 69	/* filled with printable characters, ending with # */
 70	p = memscan(data, '#', rc);
 71	*p = '\0';
 72
 73	return sysfs_emit(buf, "%s\n", data);
 74}
 75
 76static ssize_t ipsps_fw_version_show(struct device *dev,
 77				     struct device_attribute *devattr,
 78				     char *buf)
 79{
 80	u8 reg;
 81	int rc;
 82	u8 data[I2C_SMBUS_BLOCK_MAX] = { 0 };
 83	struct i2c_client *client = to_i2c_client(dev->parent);
 84	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 85
 86	reg = ipsps_regs[attr->index];
 87	rc = i2c_smbus_read_block_data(client, reg, data);
 88	if (rc < 0)
 89		return rc;
 90
 91	if (rc != 6)
 92		return -EPROTO;
 93
 94	return sysfs_emit(buf, "%u.%02u%u-%u.%02u\n",
 95			  data[1], data[2]/* < 100 */, data[3]/*< 10*/,
 96			  data[4], data[5]/* < 100 */);
 97}
 98
 99static ssize_t ipsps_mode_show(struct device *dev,
100			       struct device_attribute *devattr, char *buf)
101{
102	u8 reg;
103	int rc;
104	struct i2c_client *client = to_i2c_client(dev->parent);
105	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
106
107	reg = ipsps_regs[attr->index];
108	rc = i2c_smbus_read_byte_data(client, reg);
109	if (rc < 0)
110		return rc;
111
112	switch (rc) {
113	case MODE_ACTIVE:
114		return sysfs_emit(buf, "[%s] %s %s\n",
115				  MODE_ACTIVE_STRING,
116				  MODE_STANDBY_STRING, MODE_REDUNDANCY_STRING);
117	case MODE_STANDBY:
118		return sysfs_emit(buf, "%s [%s] %s\n",
119				  MODE_ACTIVE_STRING,
120				  MODE_STANDBY_STRING, MODE_REDUNDANCY_STRING);
121	case MODE_REDUNDANCY:
122		return sysfs_emit(buf, "%s %s [%s]\n",
123				  MODE_ACTIVE_STRING,
124				  MODE_STANDBY_STRING, MODE_REDUNDANCY_STRING);
125	default:
126		return sysfs_emit(buf, "unspecified\n");
127	}
128}
129
130static ssize_t ipsps_mode_store(struct device *dev,
131				struct device_attribute *devattr,
132				const char *buf, size_t count)
133{
134	u8 reg;
135	int rc;
136	struct i2c_client *client = to_i2c_client(dev->parent);
137	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
138
139	reg = ipsps_regs[attr->index];
140	if (sysfs_streq(MODE_STANDBY_STRING, buf)) {
141		rc = i2c_smbus_write_byte_data(client, reg,
142					       MODE_STANDBY);
143		if (rc < 0)
144			return rc;
145		return count;
146	} else if (sysfs_streq(MODE_ACTIVE_STRING, buf)) {
147		rc = i2c_smbus_write_byte_data(client, reg,
148					       MODE_ACTIVE);
149		if (rc < 0)
150			return rc;
151		return count;
152	}
153
154	return -EINVAL;
155}
156
157static SENSOR_DEVICE_ATTR_RO(vendor, ipsps_string, vendor);
158static SENSOR_DEVICE_ATTR_RO(model, ipsps_string, model);
159static SENSOR_DEVICE_ATTR_RO(part_number, ipsps_string, part_number);
160static SENSOR_DEVICE_ATTR_RO(serial_number, ipsps_string, serial_number);
161static SENSOR_DEVICE_ATTR_RO(hw_version, ipsps_string, hw_version);
162static SENSOR_DEVICE_ATTR_RO(fw_version, ipsps_fw_version, fw_version);
163static SENSOR_DEVICE_ATTR_RW(mode, ipsps_mode, mode);
164
165static struct attribute *ipsps_attrs[] = {
166	&sensor_dev_attr_vendor.dev_attr.attr,
167	&sensor_dev_attr_model.dev_attr.attr,
168	&sensor_dev_attr_part_number.dev_attr.attr,
169	&sensor_dev_attr_serial_number.dev_attr.attr,
170	&sensor_dev_attr_hw_version.dev_attr.attr,
171	&sensor_dev_attr_fw_version.dev_attr.attr,
172	&sensor_dev_attr_mode.dev_attr.attr,
173	NULL,
174};
175
176ATTRIBUTE_GROUPS(ipsps);
177
178static struct pmbus_driver_info ipsps_info = {
179	.pages = 1,
180	.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |
181		PMBUS_HAVE_IIN | PMBUS_HAVE_POUT | PMBUS_HAVE_PIN |
182		PMBUS_HAVE_FAN12 | PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 |
183		PMBUS_HAVE_TEMP3 | PMBUS_HAVE_STATUS_VOUT |
184		PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_STATUS_INPUT |
185		PMBUS_HAVE_STATUS_TEMP | PMBUS_HAVE_STATUS_FAN12,
186	.groups = ipsps_groups,
187};
188
189static struct pmbus_platform_data ipsps_pdata = {
190	.flags = PMBUS_SKIP_STATUS_CHECK,
191};
192
193static int ipsps_probe(struct i2c_client *client)
194{
195	client->dev.platform_data = &ipsps_pdata;
196	return pmbus_do_probe(client, &ipsps_info);
197}
198
199static const struct i2c_device_id ipsps_id[] = {
200	{ "ipsps1" },
201	{}
202};
203MODULE_DEVICE_TABLE(i2c, ipsps_id);
204
205#ifdef CONFIG_OF
206static const struct of_device_id ipsps_of_match[] = {
207	{ .compatible = "inspur,ipsps1" },
208	{}
209};
210MODULE_DEVICE_TABLE(of, ipsps_of_match);
211#endif
212
213static struct i2c_driver ipsps_driver = {
214	.driver = {
215		.name = "inspur-ipsps",
216		.of_match_table = of_match_ptr(ipsps_of_match),
217	},
218	.probe = ipsps_probe,
219	.id_table = ipsps_id,
220};
221
222module_i2c_driver(ipsps_driver);
223
224MODULE_AUTHOR("John Wang");
225MODULE_DESCRIPTION("PMBus driver for Inspur Power System power supplies");
226MODULE_LICENSE("GPL");
227MODULE_IMPORT_NS("PMBUS");