--- /dev/null
+/*
+ * Hardware monitoring driver for UCD90xxx Sequencer and System Health
+ * Controller series
+ *
+ * Copyright (C) 2011 Ericsson AB.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/i2c/pmbus.h>
+#include "pmbus.h"
+
+enum chips { ucd9000, ucd90120, ucd90124, ucd9090, ucd90910 };
+
+#define UCD9000_MONITOR_CONFIG 0xd5
+#define UCD9000_NUM_PAGES 0xd6
+#define UCD9000_FAN_CONFIG_INDEX 0xe7
+#define UCD9000_FAN_CONFIG 0xe8
+#define UCD9000_DEVICE_ID 0xfd
+
+#define UCD9000_MON_TYPE(x) (((x) >> 5) & 0x07)
+#define UCD9000_MON_PAGE(x) ((x) & 0x0f)
+
+#define UCD9000_MON_VOLTAGE 1
+#define UCD9000_MON_TEMPERATURE 2
+#define UCD9000_MON_CURRENT 3
+#define UCD9000_MON_VOLTAGE_HW 4
+
+#define UCD9000_NUM_FAN 4
+
+struct ucd9000_data {
+ u8 fan_data[UCD9000_NUM_FAN][I2C_SMBUS_BLOCK_MAX];
+ struct pmbus_driver_info info;
+};
+#define to_ucd9000_data(_info) container_of(_info, struct ucd9000_data, info)
+
+static int ucd9000_get_fan_config(struct i2c_client *client, int fan)
+{
+ int fan_config = 0;
+ struct ucd9000_data *data
+ = to_ucd9000_data(pmbus_get_driver_info(client));
+
+ if (data->fan_data[fan][3] & 1)
+ fan_config |= PB_FAN_2_INSTALLED; /* Use lower bit position */
+
+ /* Pulses/revolution */
+ fan_config |= (data->fan_data[fan][3] & 0x06) >> 1;
+
+ return fan_config;
+}
+
+static int ucd9000_read_byte_data(struct i2c_client *client, int page, int reg)
+{
+ int ret = 0;
+ int fan_config;
+
+ switch (reg) {
+ case PMBUS_FAN_CONFIG_12:
+ if (page > 0)
+ return -ENXIO;
+
+ ret = ucd9000_get_fan_config(client, 0);
+ if (ret < 0)
+ return ret;
+ fan_config = ret << 4;
+ ret = ucd9000_get_fan_config(client, 1);
+ if (ret < 0)
+ return ret;
+ fan_config |= ret;
+ ret = fan_config;
+ break;
+ case PMBUS_FAN_CONFIG_34:
+ if (page > 0)
+ return -ENXIO;
+
+ ret = ucd9000_get_fan_config(client, 2);
+ if (ret < 0)
+ return ret;
+ fan_config = ret << 4;
+ ret = ucd9000_get_fan_config(client, 3);
+ if (ret < 0)
+ return ret;
+ fan_config |= ret;
+ ret = fan_config;
+ break;
+ default:
+ ret = -ENODATA;
+ break;
+ }
+ return ret;
+}
+
+static const struct i2c_device_id ucd9000_id[] = {
+ {"ucd9000", ucd9000},
+ {"ucd90120", ucd90120},
+ {"ucd90124", ucd90124},
+ {"ucd9090", ucd9090},
+ {"ucd90910", ucd90910},
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, ucd9000_id);
+
+static int ucd9000_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1];
+ struct ucd9000_data *data;
+ struct pmbus_driver_info *info;
+ const struct i2c_device_id *mid;
+ int i, ret;
+
+ if (!i2c_check_functionality(client->adapter,
+ I2C_FUNC_SMBUS_BYTE_DATA |
+ I2C_FUNC_SMBUS_BLOCK_DATA))
+ return -ENODEV;
+
+ ret = i2c_smbus_read_block_data(client, UCD9000_DEVICE_ID,
+ block_buffer);
+ if (ret < 0) {
+ dev_err(&client->dev, "Failed to read device ID\n");
+ return ret;
+ }
+ block_buffer[ret] = '\0';
+ dev_info(&client->dev, "Device ID %s\n", block_buffer);
+
+ for (mid = ucd9000_id; mid->name[0]; mid++) {
+ if (!strncasecmp(mid->name, block_buffer, strlen(mid->name)))
+ break;
+ }
+ if (!mid->name[0]) {
+ dev_err(&client->dev, "Unsupported device\n");
+ return -ENODEV;
+ }
+
+ if (id->driver_data != ucd9000 && id->driver_data != mid->driver_data)
+ dev_notice(&client->dev,
+ "Device mismatch: Configured %s, detected %s\n",
+ id->name, mid->name);
+
+ data = devm_kzalloc(&client->dev, sizeof(struct ucd9000_data),
+ GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+ info = &data->info;
+
+ ret = i2c_smbus_read_byte_data(client, UCD9000_NUM_PAGES);
+ if (ret < 0) {
+ dev_err(&client->dev,
+ "Failed to read number of active pages\n");
+ return ret;
+ }
+ info->pages = ret;
+ if (!info->pages) {
+ dev_err(&client->dev, "No pages configured\n");
+ return -ENODEV;
+ }
+
+ /* The internal temperature sensor is always active */
+ info->func[0] = PMBUS_HAVE_TEMP;
+
+ /* Everything else is configurable */
+ ret = i2c_smbus_read_block_data(client, UCD9000_MONITOR_CONFIG,
+ block_buffer);
+ if (ret <= 0) {
+ dev_err(&client->dev, "Failed to read configuration data\n");
+ return -ENODEV;
+ }
+ for (i = 0; i < ret; i++) {
+ int page = UCD9000_MON_PAGE(block_buffer[i]);
+
+ if (page >= info->pages)
+ continue;
+
+ switch (UCD9000_MON_TYPE(block_buffer[i])) {
+ case UCD9000_MON_VOLTAGE:
+ case UCD9000_MON_VOLTAGE_HW:
+ info->func[page] |= PMBUS_HAVE_VOUT
+ | PMBUS_HAVE_STATUS_VOUT;
+ break;
+ case UCD9000_MON_TEMPERATURE:
+ info->func[page] |= PMBUS_HAVE_TEMP2
+ | PMBUS_HAVE_STATUS_TEMP;
+ break;
+ case UCD9000_MON_CURRENT:
+ info->func[page] |= PMBUS_HAVE_IOUT
+ | PMBUS_HAVE_STATUS_IOUT;
+ break;
+ default:
+ break;
+ }
+ }
+
+ /* Fan configuration */
+ if (mid->driver_data == ucd90124) {
+ for (i = 0; i < UCD9000_NUM_FAN; i++) {
+ i2c_smbus_write_byte_data(client,
+ UCD9000_FAN_CONFIG_INDEX, i);
+ ret = i2c_smbus_read_block_data(client,
+ UCD9000_FAN_CONFIG,
+ data->fan_data[i]);
+ if (ret < 0)
+ return ret;
+ }
+ i2c_smbus_write_byte_data(client, UCD9000_FAN_CONFIG_INDEX, 0);
+
+ info->read_byte_data = ucd9000_read_byte_data;
+ info->func[0] |= PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12
+ | PMBUS_HAVE_FAN34 | PMBUS_HAVE_STATUS_FAN34;
+ }
+
+ return pmbus_do_probe(client, mid, info);
+}
+
+/* This is the driver that will be inserted */
+static struct i2c_driver ucd9000_driver = {
+ .driver = {
+ .name = "ucd9000",
+ },
+ .probe = ucd9000_probe,
+ .remove = pmbus_do_remove,
+ .id_table = ucd9000_id,
+};
+
+module_i2c_driver(ucd9000_driver);
+
+MODULE_AUTHOR("Guenter Roeck");
+MODULE_DESCRIPTION("PMBus driver for TI UCD90xxx");
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff