--- /dev/null
+Kernel driver ir35221
+=====================
+
+Supported chips:
+ * Infinion IR35221
+ Prefix: 'ir35221'
+ Addresses scanned: -
+ Datasheet: Datasheet is not publicly available.
+
+Author: Samuel Mendoza-Jonas <sam@mendozajonas.com>
+
+
+Description
+-----------
+
+IR35221 is a Digital DC-DC Multiphase Converter
+
+
+Usage Notes
+-----------
+
+This driver does not probe for PMBus devices. You will have to instantiate
+devices explicitly.
+
+Example: the following commands will load the driver for an IR35221
+at address 0x70 on I2C bus #4:
+
+# modprobe ir35221
+# echo ir35221 0x70 > /sys/bus/i2c/devices/i2c-4/new_device
+
+
+Sysfs attributes
+----------------
+
+curr1_label "iin"
+curr1_input Measured input current
+curr1_max Maximum current
+curr1_max_alarm Current high alarm
+
+curr[2-3]_label "iout[1-2]"
+curr[2-3]_input Measured output current
+curr[2-3]_crit Critical maximum current
+curr[2-3]_crit_alarm Current critical high alarm
+curr[2-3]_highest Highest output current
+curr[2-3]_lowest Lowest output current
+curr[2-3]_max Maximum current
+curr[2-3]_max_alarm Current high alarm
+
+in1_label "vin"
+in1_input Measured input voltage
+in1_crit Critical maximum input voltage
+in1_crit_alarm Input voltage critical high alarm
+in1_highest Highest input voltage
+in1_lowest Lowest input voltage
+in1_min Minimum input voltage
+in1_min_alarm Input voltage low alarm
+
+in[2-3]_label "vout[1-2]"
+in[2-3]_input Measured output voltage
+in[2-3]_lcrit Critical minimum output voltage
+in[2-3]_lcrit_alarm Output voltage critical low alarm
+in[2-3]_crit Critical maximum output voltage
+in[2-3]_crit_alarm Output voltage critical high alarm
+in[2-3]_highest Highest output voltage
+in[2-3]_lowest Lowest output voltage
+in[2-3]_max Maximum output voltage
+in[2-3]_max_alarm Output voltage high alarm
+in[2-3]_min Minimum output voltage
+in[2-3]_min_alarm Output voltage low alarm
+
+power1_label "pin"
+power1_input Measured input power
+power1_alarm Input power high alarm
+power1_max Input power limit
+
+power[2-3]_label "pout[1-2]"
+power[2-3]_input Measured output power
+power[2-3]_max Output power limit
+power[2-3]_max_alarm Output power high alarm
+
+temp[1-2]_input Measured temperature
+temp[1-2]_crit Critical high temperature
+temp[1-2]_crit_alarm Chip temperature critical high alarm
+temp[1-2]_highest Highest temperature
+temp[1-2]_lowest Lowest temperature
+temp[1-2]_max Maximum temperature
+temp[1-2]_max_alarm Chip temperature high alarm
--- /dev/null
+/*
+ * Hardware monitoring driver for IR35221
+ *
+ * Copyright (C) IBM Corporation 2017.
+ *
+ * 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.
+ */
+
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include "pmbus.h"
+
+#define IR35221_MFR_VIN_PEAK 0xc5
+#define IR35221_MFR_VOUT_PEAK 0xc6
+#define IR35221_MFR_IOUT_PEAK 0xc7
+#define IR35221_MFR_TEMP_PEAK 0xc8
+#define IR35221_MFR_VIN_VALLEY 0xc9
+#define IR35221_MFR_VOUT_VALLEY 0xca
+#define IR35221_MFR_IOUT_VALLEY 0xcb
+#define IR35221_MFR_TEMP_VALLEY 0xcc
+
+static long ir35221_reg2data(int data, enum pmbus_sensor_classes class)
+{
+ s16 exponent;
+ s32 mantissa;
+ long val;
+
+ /* We only modify LINEAR11 formats */
+ exponent = ((s16)data) >> 11;
+ mantissa = ((s16)((data & 0x7ff) << 5)) >> 5;
+
+ val = mantissa * 1000L;
+
+ /* scale result to micro-units for power sensors */
+ if (class == PSC_POWER)
+ val = val * 1000L;
+
+ if (exponent >= 0)
+ val <<= exponent;
+ else
+ val >>= -exponent;
+
+ return val;
+}
+
+#define MAX_MANTISSA (1023 * 1000)
+#define MIN_MANTISSA (511 * 1000)
+
+static u16 ir35221_data2reg(long val, enum pmbus_sensor_classes class)
+{
+ s16 exponent = 0, mantissa;
+ bool negative = false;
+
+ if (val == 0)
+ return 0;
+
+ if (val < 0) {
+ negative = true;
+ val = -val;
+ }
+
+ /* Power is in uW. Convert to mW before converting. */
+ if (class == PSC_POWER)
+ val = DIV_ROUND_CLOSEST(val, 1000L);
+
+ /* Reduce large mantissa until it fits into 10 bit */
+ while (val >= MAX_MANTISSA && exponent < 15) {
+ exponent++;
+ val >>= 1;
+ }
+ /* Increase small mantissa to improve precision */
+ while (val < MIN_MANTISSA && exponent > -15) {
+ exponent--;
+ val <<= 1;
+ }
+
+ /* Convert mantissa from milli-units to units */
+ mantissa = DIV_ROUND_CLOSEST(val, 1000);
+
+ /* Ensure that resulting number is within range */
+ if (mantissa > 0x3ff)
+ mantissa = 0x3ff;
+
+ /* restore sign */
+ if (negative)
+ mantissa = -mantissa;
+
+ /* Convert to 5 bit exponent, 11 bit mantissa */
+ return (mantissa & 0x7ff) | ((exponent << 11) & 0xf800);
+}
+
+static u16 ir35221_scale_result(s16 data, int shift,
+ enum pmbus_sensor_classes class)
+{
+ long val;
+
+ val = ir35221_reg2data(data, class);
+
+ if (shift < 0)
+ val >>= -shift;
+ else
+ val <<= shift;
+
+ return ir35221_data2reg(val, class);
+}
+
+static int ir35221_read_word_data(struct i2c_client *client, int page, int reg)
+{
+ int ret;
+
+ switch (reg) {
+ case PMBUS_IOUT_OC_FAULT_LIMIT:
+ case PMBUS_IOUT_OC_WARN_LIMIT:
+ ret = pmbus_read_word_data(client, page, reg);
+ if (ret < 0)
+ break;
+ ret = ir35221_scale_result(ret, 1, PSC_CURRENT_OUT);
+ break;
+ case PMBUS_VIN_OV_FAULT_LIMIT:
+ case PMBUS_VIN_OV_WARN_LIMIT:
+ case PMBUS_VIN_UV_WARN_LIMIT:
+ ret = pmbus_read_word_data(client, page, reg);
+ ret = ir35221_scale_result(ret, -4, PSC_VOLTAGE_IN);
+ break;
+ case PMBUS_IIN_OC_WARN_LIMIT:
+ ret = pmbus_read_word_data(client, page, reg);
+ if (ret < 0)
+ break;
+ ret = ir35221_scale_result(ret, -1, PSC_CURRENT_IN);
+ break;
+ case PMBUS_READ_VIN:
+ ret = pmbus_read_word_data(client, page, PMBUS_READ_VIN);
+ if (ret < 0)
+ break;
+ ret = ir35221_scale_result(ret, -5, PSC_VOLTAGE_IN);
+ break;
+ case PMBUS_READ_IIN:
+ ret = pmbus_read_word_data(client, page, PMBUS_READ_IIN);
+ if (ret < 0)
+ break;
+ if (page == 0)
+ ret = ir35221_scale_result(ret, -4, PSC_CURRENT_IN);
+ else
+ ret = ir35221_scale_result(ret, -5, PSC_CURRENT_IN);
+ break;
+ case PMBUS_READ_POUT:
+ ret = pmbus_read_word_data(client, page, PMBUS_READ_POUT);
+ if (ret < 0)
+ break;
+ ret = ir35221_scale_result(ret, -1, PSC_POWER);
+ break;
+ case PMBUS_READ_PIN:
+ ret = pmbus_read_word_data(client, page, PMBUS_READ_PIN);
+ if (ret < 0)
+ break;
+ ret = ir35221_scale_result(ret, -1, PSC_POWER);
+ break;
+ case PMBUS_READ_IOUT:
+ ret = pmbus_read_word_data(client, page, PMBUS_READ_IOUT);
+ if (ret < 0)
+ break;
+ if (page == 0)
+ ret = ir35221_scale_result(ret, -1, PSC_CURRENT_OUT);
+ else
+ ret = ir35221_scale_result(ret, -2, PSC_CURRENT_OUT);
+ break;
+ case PMBUS_VIRT_READ_VIN_MAX:
+ ret = pmbus_read_word_data(client, page, IR35221_MFR_VIN_PEAK);
+ if (ret < 0)
+ break;
+ ret = ir35221_scale_result(ret, -5, PSC_VOLTAGE_IN);
+ break;
+ case PMBUS_VIRT_READ_VOUT_MAX:
+ ret = pmbus_read_word_data(client, page, IR35221_MFR_VOUT_PEAK);
+ break;
+ case PMBUS_VIRT_READ_IOUT_MAX:
+ ret = pmbus_read_word_data(client, page, IR35221_MFR_IOUT_PEAK);
+ if (ret < 0)
+ break;
+ if (page == 0)
+ ret = ir35221_scale_result(ret, -1, PSC_CURRENT_IN);
+ else
+ ret = ir35221_scale_result(ret, -2, PSC_CURRENT_IN);
+ break;
+ case PMBUS_VIRT_READ_TEMP_MAX:
+ ret = pmbus_read_word_data(client, page, IR35221_MFR_TEMP_PEAK);
+ break;
+ case PMBUS_VIRT_READ_VIN_MIN:
+ ret = pmbus_read_word_data(client, page,
+ IR35221_MFR_VIN_VALLEY);
+ if (ret < 0)
+ break;
+ ret = ir35221_scale_result(ret, -5, PSC_VOLTAGE_IN);
+ break;
+ case PMBUS_VIRT_READ_VOUT_MIN:
+ ret = pmbus_read_word_data(client, page,
+ IR35221_MFR_VOUT_VALLEY);
+ break;
+ case PMBUS_VIRT_READ_IOUT_MIN:
+ ret = pmbus_read_word_data(client, page,
+ IR35221_MFR_IOUT_VALLEY);
+ if (ret < 0)
+ break;
+ if (page == 0)
+ ret = ir35221_scale_result(ret, -1, PSC_CURRENT_IN);
+ else
+ ret = ir35221_scale_result(ret, -2, PSC_CURRENT_IN);
+ break;
+ case PMBUS_VIRT_READ_TEMP_MIN:
+ ret = pmbus_read_word_data(client, page,
+ IR35221_MFR_TEMP_VALLEY);
+ break;
+ default:
+ ret = -ENODATA;
+ break;
+ }
+
+ return ret;
+}
+
+static int ir35221_write_word_data(struct i2c_client *client, int page, int reg,
+ u16 word)
+{
+ int ret;
+ u16 val;
+
+ switch (reg) {
+ case PMBUS_IOUT_OC_FAULT_LIMIT:
+ case PMBUS_IOUT_OC_WARN_LIMIT:
+ val = ir35221_scale_result(word, -1, PSC_CURRENT_OUT);
+ ret = pmbus_write_word_data(client, page, reg, val);
+ break;
+ case PMBUS_VIN_OV_FAULT_LIMIT:
+ case PMBUS_VIN_OV_WARN_LIMIT:
+ case PMBUS_VIN_UV_WARN_LIMIT:
+ val = ir35221_scale_result(word, 4, PSC_VOLTAGE_IN);
+ ret = pmbus_write_word_data(client, page, reg, val);
+ break;
+ case PMBUS_IIN_OC_WARN_LIMIT:
+ val = ir35221_scale_result(word, 1, PSC_CURRENT_IN);
+ ret = pmbus_write_word_data(client, page, reg, val);
+ break;
+ default:
+ ret = -ENODATA;
+ break;
+ }
+
+ return ret;
+}
+
+static int ir35221_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct pmbus_driver_info *info;
+ u8 buf[I2C_SMBUS_BLOCK_MAX];
+ int ret;
+
+ if (!i2c_check_functionality(client->adapter,
+ I2C_FUNC_SMBUS_READ_BYTE_DATA
+ | I2C_FUNC_SMBUS_READ_WORD_DATA
+ | I2C_FUNC_SMBUS_READ_BLOCK_DATA))
+ return -ENODEV;
+
+ ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf);
+ if (ret < 0) {
+ dev_err(&client->dev, "Failed to read PMBUS_MFR_ID\n");
+ return ret;
+ }
+ if (ret != 2 || strncmp(buf, "RI", strlen("RI"))) {
+ dev_err(&client->dev, "MFR_ID unrecognised\n");
+ return -ENODEV;
+ }
+
+ ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf);
+ if (ret < 0) {
+ dev_err(&client->dev, "Failed to read PMBUS_MFR_MODEL\n");
+ return ret;
+ }
+ if (ret != 2 || !(buf[0] == 0x6c && buf[1] == 0x00)) {
+ dev_err(&client->dev, "MFR_MODEL unrecognised\n");
+ return -ENODEV;
+ }
+
+ info = devm_kzalloc(&client->dev, sizeof(struct pmbus_driver_info),
+ GFP_KERNEL);
+ if (!info)
+ return -ENOMEM;
+
+ info->write_word_data = ir35221_write_word_data;
+ info->read_word_data = ir35221_read_word_data;
+
+ info->pages = 2;
+ info->format[PSC_VOLTAGE_IN] = linear;
+ info->format[PSC_VOLTAGE_OUT] = linear;
+ info->format[PSC_CURRENT_IN] = linear;
+ info->format[PSC_CURRENT_OUT] = linear;
+ info->format[PSC_POWER] = linear;
+ info->format[PSC_TEMPERATURE] = linear;
+
+ info->func[0] = PMBUS_HAVE_VIN
+ | PMBUS_HAVE_VOUT | PMBUS_HAVE_IIN
+ | PMBUS_HAVE_IOUT | PMBUS_HAVE_PIN
+ | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP
+ | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT
+ | PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP;
+ info->func[1] = info->func[0];
+
+ return pmbus_do_probe(client, id, info);
+}
+
+static const struct i2c_device_id ir35221_id[] = {
+ {"ir35221", 0},
+ {}
+};
+
+MODULE_DEVICE_TABLE(i2c, ir35221_id);
+
+static struct i2c_driver ir35221_driver = {
+ .driver = {
+ .name = "ir35221",
+ },
+ .probe = ir35221_probe,
+ .remove = pmbus_do_remove,
+ .id_table = ir35221_id,
+};
+
+module_i2c_driver(ir35221_driver);
+
+MODULE_AUTHOR("Samuel Mendoza-Jonas <sam@mendozajonas.com");
+MODULE_DESCRIPTION("PMBus driver for IR35221");
+MODULE_LICENSE("GPL");
projects / linux-2.6-microblaze.git / commitdiff