336 lines
8.3 KiB
C
336 lines
8.3 KiB
C
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* Hardware monitoring driver for Renesas Digital Multiphase Voltage Regulators
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*
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* Copyright (c) 2017 Google Inc
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* Copyright (c) 2020 Renesas Electronics America
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*
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*/
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#include <linux/err.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/i2c.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/sysfs.h>
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#include "pmbus.h"
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#define ISL68137_VOUT_AVS 0x30
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#define RAA_DMPVR2_READ_VMON 0xc8
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enum chips {
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isl68137,
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isl68220,
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isl68221,
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isl68222,
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isl68223,
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isl68224,
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isl68225,
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isl68226,
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isl68227,
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isl68229,
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isl68233,
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isl68239,
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isl69222,
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isl69223,
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isl69224,
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isl69225,
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isl69227,
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isl69228,
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isl69234,
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isl69236,
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isl69239,
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isl69242,
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isl69243,
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isl69247,
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isl69248,
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isl69254,
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isl69255,
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isl69256,
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isl69259,
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isl69260,
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isl69268,
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isl69269,
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isl69298,
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raa228000,
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raa228004,
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raa228006,
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raa228228,
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raa229001,
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raa229004,
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};
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enum variants {
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raa_dmpvr1_2rail,
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raa_dmpvr2_1rail,
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raa_dmpvr2_2rail,
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raa_dmpvr2_2rail_nontc,
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raa_dmpvr2_3rail,
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raa_dmpvr2_hv,
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};
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static const struct i2c_device_id raa_dmpvr_id[];
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static ssize_t isl68137_avs_enable_show_page(struct i2c_client *client,
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int page,
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char *buf)
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{
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int val = pmbus_read_byte_data(client, page, PMBUS_OPERATION);
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return sprintf(buf, "%d\n",
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(val & ISL68137_VOUT_AVS) == ISL68137_VOUT_AVS ? 1 : 0);
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}
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static ssize_t isl68137_avs_enable_store_page(struct i2c_client *client,
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int page,
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const char *buf, size_t count)
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{
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int rc, op_val;
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bool result;
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rc = kstrtobool(buf, &result);
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if (rc)
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return rc;
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op_val = result ? ISL68137_VOUT_AVS : 0;
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/*
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* Writes to VOUT setpoint over AVSBus will persist after the VRM is
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* switched to PMBus control. Switching back to AVSBus control
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* restores this persisted setpoint rather than re-initializing to
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* PMBus VOUT_COMMAND. Writing VOUT_COMMAND first over PMBus before
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* enabling AVS control is the workaround.
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*/
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if (op_val == ISL68137_VOUT_AVS) {
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rc = pmbus_read_word_data(client, page, 0xff,
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PMBUS_VOUT_COMMAND);
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if (rc < 0)
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return rc;
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rc = pmbus_write_word_data(client, page, PMBUS_VOUT_COMMAND,
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rc);
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if (rc < 0)
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return rc;
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}
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rc = pmbus_update_byte_data(client, page, PMBUS_OPERATION,
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ISL68137_VOUT_AVS, op_val);
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return (rc < 0) ? rc : count;
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}
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static ssize_t isl68137_avs_enable_show(struct device *dev,
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struct device_attribute *devattr,
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char *buf)
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{
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struct i2c_client *client = to_i2c_client(dev->parent);
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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return isl68137_avs_enable_show_page(client, attr->index, buf);
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}
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static ssize_t isl68137_avs_enable_store(struct device *dev,
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struct device_attribute *devattr,
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const char *buf, size_t count)
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{
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struct i2c_client *client = to_i2c_client(dev->parent);
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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return isl68137_avs_enable_store_page(client, attr->index, buf, count);
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}
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static SENSOR_DEVICE_ATTR_RW(avs0_enable, isl68137_avs_enable, 0);
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static SENSOR_DEVICE_ATTR_RW(avs1_enable, isl68137_avs_enable, 1);
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static struct attribute *enable_attrs[] = {
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&sensor_dev_attr_avs0_enable.dev_attr.attr,
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&sensor_dev_attr_avs1_enable.dev_attr.attr,
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NULL,
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};
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static const struct attribute_group enable_group = {
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.attrs = enable_attrs,
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};
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static const struct attribute_group *isl68137_attribute_groups[] = {
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&enable_group,
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NULL,
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};
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static int raa_dmpvr2_read_word_data(struct i2c_client *client, int page,
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int phase, int reg)
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{
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int ret;
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switch (reg) {
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case PMBUS_VIRT_READ_VMON:
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ret = pmbus_read_word_data(client, page, phase,
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RAA_DMPVR2_READ_VMON);
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break;
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default:
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ret = -ENODATA;
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break;
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}
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return ret;
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}
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static struct pmbus_driver_info raa_dmpvr_info = {
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.pages = 3,
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.format[PSC_VOLTAGE_IN] = direct,
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.format[PSC_VOLTAGE_OUT] = direct,
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.format[PSC_CURRENT_IN] = direct,
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.format[PSC_CURRENT_OUT] = direct,
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.format[PSC_POWER] = direct,
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.format[PSC_TEMPERATURE] = direct,
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.m[PSC_VOLTAGE_IN] = 1,
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.b[PSC_VOLTAGE_IN] = 0,
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.R[PSC_VOLTAGE_IN] = 2,
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.m[PSC_VOLTAGE_OUT] = 1,
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.b[PSC_VOLTAGE_OUT] = 0,
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.R[PSC_VOLTAGE_OUT] = 3,
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.m[PSC_CURRENT_IN] = 1,
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.b[PSC_CURRENT_IN] = 0,
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.R[PSC_CURRENT_IN] = 2,
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.m[PSC_CURRENT_OUT] = 1,
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.b[PSC_CURRENT_OUT] = 0,
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.R[PSC_CURRENT_OUT] = 1,
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.m[PSC_POWER] = 1,
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.b[PSC_POWER] = 0,
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.R[PSC_POWER] = 0,
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.m[PSC_TEMPERATURE] = 1,
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.b[PSC_TEMPERATURE] = 0,
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.R[PSC_TEMPERATURE] = 0,
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.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN | PMBUS_HAVE_PIN
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| PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2
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| PMBUS_HAVE_TEMP3 | PMBUS_HAVE_STATUS_TEMP
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| PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
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| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_POUT
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| PMBUS_HAVE_VMON,
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.func[1] = PMBUS_HAVE_IIN | PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT
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| PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP3 | PMBUS_HAVE_STATUS_TEMP
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| PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_IOUT
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| PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_POUT,
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.func[2] = PMBUS_HAVE_IIN | PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT
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| PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP3 | PMBUS_HAVE_STATUS_TEMP
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| PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_IOUT
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| PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_POUT,
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};
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static int isl68137_probe(struct i2c_client *client)
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{
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struct pmbus_driver_info *info;
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info = devm_kzalloc(&client->dev, sizeof(*info), GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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memcpy(info, &raa_dmpvr_info, sizeof(*info));
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switch (i2c_match_id(raa_dmpvr_id, client)->driver_data) {
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case raa_dmpvr1_2rail:
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info->pages = 2;
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info->R[PSC_VOLTAGE_IN] = 3;
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info->func[0] &= ~PMBUS_HAVE_VMON;
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info->func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
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| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
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| PMBUS_HAVE_POUT;
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info->groups = isl68137_attribute_groups;
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break;
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case raa_dmpvr2_1rail:
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info->pages = 1;
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info->read_word_data = raa_dmpvr2_read_word_data;
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break;
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case raa_dmpvr2_2rail_nontc:
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info->func[0] &= ~PMBUS_HAVE_TEMP3;
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info->func[1] &= ~PMBUS_HAVE_TEMP3;
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fallthrough;
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case raa_dmpvr2_2rail:
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info->pages = 2;
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info->read_word_data = raa_dmpvr2_read_word_data;
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break;
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case raa_dmpvr2_3rail:
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info->read_word_data = raa_dmpvr2_read_word_data;
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break;
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case raa_dmpvr2_hv:
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info->pages = 1;
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info->R[PSC_VOLTAGE_IN] = 1;
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info->m[PSC_VOLTAGE_OUT] = 2;
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info->R[PSC_VOLTAGE_OUT] = 2;
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info->m[PSC_CURRENT_IN] = 2;
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info->m[PSC_POWER] = 2;
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info->R[PSC_POWER] = -1;
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info->read_word_data = raa_dmpvr2_read_word_data;
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break;
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default:
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return -ENODEV;
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}
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return pmbus_do_probe(client, info);
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}
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static const struct i2c_device_id raa_dmpvr_id[] = {
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{"isl68137", raa_dmpvr1_2rail},
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{"isl68220", raa_dmpvr2_2rail},
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{"isl68221", raa_dmpvr2_3rail},
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{"isl68222", raa_dmpvr2_2rail},
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{"isl68223", raa_dmpvr2_2rail},
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{"isl68224", raa_dmpvr2_3rail},
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{"isl68225", raa_dmpvr2_2rail},
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{"isl68226", raa_dmpvr2_3rail},
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{"isl68227", raa_dmpvr2_1rail},
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{"isl68229", raa_dmpvr2_3rail},
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{"isl68233", raa_dmpvr2_2rail},
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{"isl68239", raa_dmpvr2_3rail},
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{"isl69222", raa_dmpvr2_2rail},
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{"isl69223", raa_dmpvr2_3rail},
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{"isl69224", raa_dmpvr2_2rail},
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{"isl69225", raa_dmpvr2_2rail},
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{"isl69227", raa_dmpvr2_3rail},
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{"isl69228", raa_dmpvr2_3rail},
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{"isl69234", raa_dmpvr2_2rail},
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{"isl69236", raa_dmpvr2_2rail},
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{"isl69239", raa_dmpvr2_3rail},
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{"isl69242", raa_dmpvr2_2rail},
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{"isl69243", raa_dmpvr2_1rail},
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{"isl69247", raa_dmpvr2_2rail},
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{"isl69248", raa_dmpvr2_2rail},
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{"isl69254", raa_dmpvr2_2rail},
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{"isl69255", raa_dmpvr2_2rail},
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{"isl69256", raa_dmpvr2_2rail},
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{"isl69259", raa_dmpvr2_2rail},
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{"isl69260", raa_dmpvr2_2rail},
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{"isl69268", raa_dmpvr2_2rail},
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{"isl69269", raa_dmpvr2_3rail},
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{"isl69298", raa_dmpvr2_2rail},
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{"raa228000", raa_dmpvr2_hv},
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{"raa228004", raa_dmpvr2_hv},
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{"raa228006", raa_dmpvr2_hv},
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{"raa228228", raa_dmpvr2_2rail_nontc},
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{"raa229001", raa_dmpvr2_2rail},
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{"raa229004", raa_dmpvr2_2rail},
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{}
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};
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MODULE_DEVICE_TABLE(i2c, raa_dmpvr_id);
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/* This is the driver that will be inserted */
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static struct i2c_driver isl68137_driver = {
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.driver = {
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.name = "isl68137",
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},
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.probe_new = isl68137_probe,
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.id_table = raa_dmpvr_id,
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};
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module_i2c_driver(isl68137_driver);
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MODULE_AUTHOR("Maxim Sloyko <maxims@google.com>");
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MODULE_DESCRIPTION("PMBus driver for Renesas digital multiphase voltage regulators");
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MODULE_LICENSE("GPL");
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MODULE_IMPORT_NS(PMBUS);
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