// SPDX-License-Identifier: GPL-2.0-only
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/*
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* ultra45_env.c: Driver for Ultra45 PIC16F747 environmental monitor.
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*
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* Copyright (C) 2008 David S. Miller <davem@davemloft.net>
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*/
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/io.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/err.h>
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#define DRV_MODULE_VERSION "0.1"
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MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
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MODULE_DESCRIPTION("Ultra45 environmental monitor driver");
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MODULE_LICENSE("GPL");
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MODULE_VERSION(DRV_MODULE_VERSION);
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/* PIC device registers */
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#define REG_CMD 0x00UL
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#define REG_CMD_RESET 0x80
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#define REG_CMD_ESTAR 0x01
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#define REG_STAT 0x01UL
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#define REG_STAT_FWVER 0xf0
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#define REG_STAT_TGOOD 0x08
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#define REG_STAT_STALE 0x04
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#define REG_STAT_BUSY 0x02
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#define REG_STAT_FAULT 0x01
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#define REG_DATA 0x40UL
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#define REG_ADDR 0x41UL
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#define REG_SIZE 0x42UL
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/* Registers accessed indirectly via REG_DATA/REG_ADDR */
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#define IREG_FAN0 0x00
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#define IREG_FAN1 0x01
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#define IREG_FAN2 0x02
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#define IREG_FAN3 0x03
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#define IREG_FAN4 0x04
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#define IREG_FAN5 0x05
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#define IREG_LCL_TEMP 0x06
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#define IREG_RMT1_TEMP 0x07
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#define IREG_RMT2_TEMP 0x08
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#define IREG_RMT3_TEMP 0x09
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#define IREG_LM95221_TEMP 0x0a
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#define IREG_FIRE_TEMP 0x0b
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#define IREG_LSI1064_TEMP 0x0c
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#define IREG_FRONT_TEMP 0x0d
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#define IREG_FAN_STAT 0x0e
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#define IREG_VCORE0 0x0f
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#define IREG_VCORE1 0x10
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#define IREG_VMEM0 0x11
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#define IREG_VMEM1 0x12
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#define IREG_PSU_TEMP 0x13
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struct env {
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void __iomem *regs;
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spinlock_t lock;
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struct device *hwmon_dev;
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};
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static u8 env_read(struct env *p, u8 ireg)
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{
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u8 ret;
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spin_lock(&p->lock);
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writeb(ireg, p->regs + REG_ADDR);
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ret = readb(p->regs + REG_DATA);
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spin_unlock(&p->lock);
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return ret;
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}
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static void env_write(struct env *p, u8 ireg, u8 val)
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{
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spin_lock(&p->lock);
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writeb(ireg, p->regs + REG_ADDR);
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writeb(val, p->regs + REG_DATA);
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spin_unlock(&p->lock);
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}
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/*
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* There seems to be a adr7462 providing these values, thus a lot
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* of these calculations are borrowed from the adt7470 driver.
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*/
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#define FAN_PERIOD_TO_RPM(x) ((90000 * 60) / (x))
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#define FAN_RPM_TO_PERIOD FAN_PERIOD_TO_RPM
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#define FAN_PERIOD_INVALID (0xff << 8)
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#define FAN_DATA_VALID(x) ((x) && (x) != FAN_PERIOD_INVALID)
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static ssize_t show_fan_speed(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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int fan_nr = to_sensor_dev_attr(attr)->index;
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struct env *p = dev_get_drvdata(dev);
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int rpm, period;
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u8 val;
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val = env_read(p, IREG_FAN0 + fan_nr);
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period = (int) val << 8;
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if (FAN_DATA_VALID(period))
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rpm = FAN_PERIOD_TO_RPM(period);
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else
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rpm = 0;
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return sprintf(buf, "%d\n", rpm);
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}
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static ssize_t set_fan_speed(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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int fan_nr = to_sensor_dev_attr(attr)->index;
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unsigned long rpm;
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struct env *p = dev_get_drvdata(dev);
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int period;
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u8 val;
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int err;
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err = kstrtoul(buf, 10, &rpm);
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if (err)
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return err;
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if (!rpm)
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return -EINVAL;
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period = FAN_RPM_TO_PERIOD(rpm);
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val = period >> 8;
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env_write(p, IREG_FAN0 + fan_nr, val);
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return count;
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}
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static ssize_t show_fan_fault(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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int fan_nr = to_sensor_dev_attr(attr)->index;
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struct env *p = dev_get_drvdata(dev);
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u8 val = env_read(p, IREG_FAN_STAT);
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return sprintf(buf, "%d\n", (val & (1 << fan_nr)) ? 1 : 0);
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}
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#define fan(index) \
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static SENSOR_DEVICE_ATTR(fan##index##_speed, S_IRUGO | S_IWUSR, \
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show_fan_speed, set_fan_speed, index); \
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static SENSOR_DEVICE_ATTR(fan##index##_fault, S_IRUGO, \
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show_fan_fault, NULL, index)
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fan(0);
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fan(1);
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fan(2);
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fan(3);
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fan(4);
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static SENSOR_DEVICE_ATTR(psu_fan_fault, S_IRUGO, show_fan_fault, NULL, 6);
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static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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int temp_nr = to_sensor_dev_attr(attr)->index;
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struct env *p = dev_get_drvdata(dev);
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s8 val;
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val = env_read(p, IREG_LCL_TEMP + temp_nr);
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return sprintf(buf, "%d\n", ((int) val) - 64);
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}
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static SENSOR_DEVICE_ATTR(adt7462_local_temp, S_IRUGO, show_temp, NULL, 0);
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static SENSOR_DEVICE_ATTR(cpu0_temp, S_IRUGO, show_temp, NULL, 1);
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static SENSOR_DEVICE_ATTR(cpu1_temp, S_IRUGO, show_temp, NULL, 2);
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static SENSOR_DEVICE_ATTR(motherboard_temp, S_IRUGO, show_temp, NULL, 3);
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static SENSOR_DEVICE_ATTR(lm95221_local_temp, S_IRUGO, show_temp, NULL, 4);
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static SENSOR_DEVICE_ATTR(fire_temp, S_IRUGO, show_temp, NULL, 5);
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static SENSOR_DEVICE_ATTR(lsi1064_local_temp, S_IRUGO, show_temp, NULL, 6);
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static SENSOR_DEVICE_ATTR(front_panel_temp, S_IRUGO, show_temp, NULL, 7);
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static SENSOR_DEVICE_ATTR(psu_temp, S_IRUGO, show_temp, NULL, 13);
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static ssize_t show_stat_bit(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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int index = to_sensor_dev_attr(attr)->index;
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struct env *p = dev_get_drvdata(dev);
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u8 val;
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val = readb(p->regs + REG_STAT);
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return sprintf(buf, "%d\n", (val & (1 << index)) ? 1 : 0);
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}
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static SENSOR_DEVICE_ATTR(fan_failure, S_IRUGO, show_stat_bit, NULL, 0);
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static SENSOR_DEVICE_ATTR(env_bus_busy, S_IRUGO, show_stat_bit, NULL, 1);
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static SENSOR_DEVICE_ATTR(env_data_stale, S_IRUGO, show_stat_bit, NULL, 2);
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static SENSOR_DEVICE_ATTR(tpm_self_test_passed, S_IRUGO, show_stat_bit, NULL,
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3);
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static ssize_t show_fwver(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct env *p = dev_get_drvdata(dev);
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u8 val;
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val = readb(p->regs + REG_STAT);
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return sprintf(buf, "%d\n", val >> 4);
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}
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static SENSOR_DEVICE_ATTR(firmware_version, S_IRUGO, show_fwver, NULL, 0);
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static ssize_t show_name(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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return sprintf(buf, "ultra45\n");
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}
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static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0);
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static struct attribute *env_attributes[] = {
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&sensor_dev_attr_fan0_speed.dev_attr.attr,
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&sensor_dev_attr_fan0_fault.dev_attr.attr,
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&sensor_dev_attr_fan1_speed.dev_attr.attr,
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&sensor_dev_attr_fan1_fault.dev_attr.attr,
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&sensor_dev_attr_fan2_speed.dev_attr.attr,
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&sensor_dev_attr_fan2_fault.dev_attr.attr,
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&sensor_dev_attr_fan3_speed.dev_attr.attr,
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&sensor_dev_attr_fan3_fault.dev_attr.attr,
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&sensor_dev_attr_fan4_speed.dev_attr.attr,
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&sensor_dev_attr_fan4_fault.dev_attr.attr,
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&sensor_dev_attr_psu_fan_fault.dev_attr.attr,
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&sensor_dev_attr_adt7462_local_temp.dev_attr.attr,
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&sensor_dev_attr_cpu0_temp.dev_attr.attr,
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&sensor_dev_attr_cpu1_temp.dev_attr.attr,
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&sensor_dev_attr_motherboard_temp.dev_attr.attr,
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&sensor_dev_attr_lm95221_local_temp.dev_attr.attr,
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&sensor_dev_attr_fire_temp.dev_attr.attr,
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&sensor_dev_attr_lsi1064_local_temp.dev_attr.attr,
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&sensor_dev_attr_front_panel_temp.dev_attr.attr,
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&sensor_dev_attr_psu_temp.dev_attr.attr,
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&sensor_dev_attr_fan_failure.dev_attr.attr,
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&sensor_dev_attr_env_bus_busy.dev_attr.attr,
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&sensor_dev_attr_env_data_stale.dev_attr.attr,
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&sensor_dev_attr_tpm_self_test_passed.dev_attr.attr,
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&sensor_dev_attr_firmware_version.dev_attr.attr,
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&sensor_dev_attr_name.dev_attr.attr,
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NULL,
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};
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static const struct attribute_group env_group = {
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.attrs = env_attributes,
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};
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static int env_probe(struct platform_device *op)
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{
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struct env *p = devm_kzalloc(&op->dev, sizeof(*p), GFP_KERNEL);
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int err = -ENOMEM;
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if (!p)
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goto out;
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spin_lock_init(&p->lock);
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p->regs = of_ioremap(&op->resource[0], 0, REG_SIZE, "pic16f747");
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if (!p->regs)
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goto out;
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err = sysfs_create_group(&op->dev.kobj, &env_group);
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if (err)
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goto out_iounmap;
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p->hwmon_dev = hwmon_device_register(&op->dev);
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if (IS_ERR(p->hwmon_dev)) {
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err = PTR_ERR(p->hwmon_dev);
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goto out_sysfs_remove_group;
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}
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platform_set_drvdata(op, p);
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err = 0;
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out:
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return err;
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out_sysfs_remove_group:
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sysfs_remove_group(&op->dev.kobj, &env_group);
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out_iounmap:
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of_iounmap(&op->resource[0], p->regs, REG_SIZE);
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goto out;
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}
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static int env_remove(struct platform_device *op)
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{
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struct env *p = platform_get_drvdata(op);
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if (p) {
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sysfs_remove_group(&op->dev.kobj, &env_group);
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hwmon_device_unregister(p->hwmon_dev);
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of_iounmap(&op->resource[0], p->regs, REG_SIZE);
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}
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return 0;
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}
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static const struct of_device_id env_match[] = {
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{
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.name = "env-monitor",
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.compatible = "SUNW,ebus-pic16f747-env",
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},
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{},
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};
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MODULE_DEVICE_TABLE(of, env_match);
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static struct platform_driver env_driver = {
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.driver = {
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.name = "ultra45_env",
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.of_match_table = env_match,
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},
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.probe = env_probe,
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.remove = env_remove,
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};
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module_platform_driver(env_driver);
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