324 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*3 * ultra45_env.c: Driver for Ultra45 PIC16F747 environmental monitor.4 *5 * Copyright (C) 2008 David S. Miller <davem@davemloft.net>6 */7 8#include <linux/kernel.h>9#include <linux/types.h>10#include <linux/slab.h>11#include <linux/module.h>12#include <linux/of.h>13#include <linux/platform_device.h>14#include <linux/io.h>15#include <linux/hwmon.h>16#include <linux/hwmon-sysfs.h>17#include <linux/err.h>18 19#define DRV_MODULE_VERSION "0.1"20 21MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");22MODULE_DESCRIPTION("Ultra45 environmental monitor driver");23MODULE_LICENSE("GPL");24MODULE_VERSION(DRV_MODULE_VERSION);25 26/* PIC device registers */27#define REG_CMD 0x00UL28#define REG_CMD_RESET 0x8029#define REG_CMD_ESTAR 0x0130#define REG_STAT 0x01UL31#define REG_STAT_FWVER 0xf032#define REG_STAT_TGOOD 0x0833#define REG_STAT_STALE 0x0434#define REG_STAT_BUSY 0x0235#define REG_STAT_FAULT 0x0136#define REG_DATA 0x40UL37#define REG_ADDR 0x41UL38#define REG_SIZE 0x42UL39 40/* Registers accessed indirectly via REG_DATA/REG_ADDR */41#define IREG_FAN0 0x0042#define IREG_FAN1 0x0143#define IREG_FAN2 0x0244#define IREG_FAN3 0x0345#define IREG_FAN4 0x0446#define IREG_FAN5 0x0547#define IREG_LCL_TEMP 0x0648#define IREG_RMT1_TEMP 0x0749#define IREG_RMT2_TEMP 0x0850#define IREG_RMT3_TEMP 0x0951#define IREG_LM95221_TEMP 0x0a52#define IREG_FIRE_TEMP 0x0b53#define IREG_LSI1064_TEMP 0x0c54#define IREG_FRONT_TEMP 0x0d55#define IREG_FAN_STAT 0x0e56#define IREG_VCORE0 0x0f57#define IREG_VCORE1 0x1058#define IREG_VMEM0 0x1159#define IREG_VMEM1 0x1260#define IREG_PSU_TEMP 0x1361 62struct env {63 void __iomem *regs;64 spinlock_t lock;65 66 struct device *hwmon_dev;67};68 69static u8 env_read(struct env *p, u8 ireg)70{71 u8 ret;72 73 spin_lock(&p->lock);74 writeb(ireg, p->regs + REG_ADDR);75 ret = readb(p->regs + REG_DATA);76 spin_unlock(&p->lock);77 78 return ret;79}80 81static void env_write(struct env *p, u8 ireg, u8 val)82{83 spin_lock(&p->lock);84 writeb(ireg, p->regs + REG_ADDR);85 writeb(val, p->regs + REG_DATA);86 spin_unlock(&p->lock);87}88 89/*90 * There seems to be a adr7462 providing these values, thus a lot91 * of these calculations are borrowed from the adt7470 driver.92 */93#define FAN_PERIOD_TO_RPM(x) ((90000 * 60) / (x))94#define FAN_RPM_TO_PERIOD FAN_PERIOD_TO_RPM95#define FAN_PERIOD_INVALID (0xff << 8)96#define FAN_DATA_VALID(x) ((x) && (x) != FAN_PERIOD_INVALID)97 98static ssize_t show_fan_speed(struct device *dev, struct device_attribute *attr,99 char *buf)100{101 int fan_nr = to_sensor_dev_attr(attr)->index;102 struct env *p = dev_get_drvdata(dev);103 int rpm, period;104 u8 val;105 106 val = env_read(p, IREG_FAN0 + fan_nr);107 period = (int) val << 8;108 if (FAN_DATA_VALID(period))109 rpm = FAN_PERIOD_TO_RPM(period);110 else111 rpm = 0;112 113 return sprintf(buf, "%d\n", rpm);114}115 116static ssize_t set_fan_speed(struct device *dev, struct device_attribute *attr,117 const char *buf, size_t count)118{119 int fan_nr = to_sensor_dev_attr(attr)->index;120 unsigned long rpm;121 struct env *p = dev_get_drvdata(dev);122 int period;123 u8 val;124 int err;125 126 err = kstrtoul(buf, 10, &rpm);127 if (err)128 return err;129 130 if (!rpm)131 return -EINVAL;132 133 period = FAN_RPM_TO_PERIOD(rpm);134 val = period >> 8;135 env_write(p, IREG_FAN0 + fan_nr, val);136 137 return count;138}139 140static ssize_t show_fan_fault(struct device *dev, struct device_attribute *attr,141 char *buf)142{143 int fan_nr = to_sensor_dev_attr(attr)->index;144 struct env *p = dev_get_drvdata(dev);145 u8 val = env_read(p, IREG_FAN_STAT);146 return sprintf(buf, "%d\n", (val & (1 << fan_nr)) ? 1 : 0);147}148 149#define fan(index) \150static SENSOR_DEVICE_ATTR(fan##index##_speed, S_IRUGO | S_IWUSR, \151 show_fan_speed, set_fan_speed, index); \152static SENSOR_DEVICE_ATTR(fan##index##_fault, S_IRUGO, \153 show_fan_fault, NULL, index)154 155fan(0);156fan(1);157fan(2);158fan(3);159fan(4);160 161static SENSOR_DEVICE_ATTR(psu_fan_fault, S_IRUGO, show_fan_fault, NULL, 6);162 163static ssize_t show_temp(struct device *dev, struct device_attribute *attr,164 char *buf)165{166 int temp_nr = to_sensor_dev_attr(attr)->index;167 struct env *p = dev_get_drvdata(dev);168 s8 val;169 170 val = env_read(p, IREG_LCL_TEMP + temp_nr);171 return sprintf(buf, "%d\n", ((int) val) - 64);172}173 174static SENSOR_DEVICE_ATTR(adt7462_local_temp, S_IRUGO, show_temp, NULL, 0);175static SENSOR_DEVICE_ATTR(cpu0_temp, S_IRUGO, show_temp, NULL, 1);176static SENSOR_DEVICE_ATTR(cpu1_temp, S_IRUGO, show_temp, NULL, 2);177static SENSOR_DEVICE_ATTR(motherboard_temp, S_IRUGO, show_temp, NULL, 3);178static SENSOR_DEVICE_ATTR(lm95221_local_temp, S_IRUGO, show_temp, NULL, 4);179static SENSOR_DEVICE_ATTR(fire_temp, S_IRUGO, show_temp, NULL, 5);180static SENSOR_DEVICE_ATTR(lsi1064_local_temp, S_IRUGO, show_temp, NULL, 6);181static SENSOR_DEVICE_ATTR(front_panel_temp, S_IRUGO, show_temp, NULL, 7);182static SENSOR_DEVICE_ATTR(psu_temp, S_IRUGO, show_temp, NULL, 13);183 184static ssize_t show_stat_bit(struct device *dev, struct device_attribute *attr,185 char *buf)186{187 int index = to_sensor_dev_attr(attr)->index;188 struct env *p = dev_get_drvdata(dev);189 u8 val;190 191 val = readb(p->regs + REG_STAT);192 return sprintf(buf, "%d\n", (val & (1 << index)) ? 1 : 0);193}194 195static SENSOR_DEVICE_ATTR(fan_failure, S_IRUGO, show_stat_bit, NULL, 0);196static SENSOR_DEVICE_ATTR(env_bus_busy, S_IRUGO, show_stat_bit, NULL, 1);197static SENSOR_DEVICE_ATTR(env_data_stale, S_IRUGO, show_stat_bit, NULL, 2);198static SENSOR_DEVICE_ATTR(tpm_self_test_passed, S_IRUGO, show_stat_bit, NULL,199 3);200 201static ssize_t show_fwver(struct device *dev, struct device_attribute *attr,202 char *buf)203{204 struct env *p = dev_get_drvdata(dev);205 u8 val;206 207 val = readb(p->regs + REG_STAT);208 return sprintf(buf, "%d\n", val >> 4);209}210 211static SENSOR_DEVICE_ATTR(firmware_version, S_IRUGO, show_fwver, NULL, 0);212 213static ssize_t show_name(struct device *dev, struct device_attribute *attr,214 char *buf)215{216 return sprintf(buf, "ultra45\n");217}218 219static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0);220 221static struct attribute *env_attributes[] = {222 &sensor_dev_attr_fan0_speed.dev_attr.attr,223 &sensor_dev_attr_fan0_fault.dev_attr.attr,224 &sensor_dev_attr_fan1_speed.dev_attr.attr,225 &sensor_dev_attr_fan1_fault.dev_attr.attr,226 &sensor_dev_attr_fan2_speed.dev_attr.attr,227 &sensor_dev_attr_fan2_fault.dev_attr.attr,228 &sensor_dev_attr_fan3_speed.dev_attr.attr,229 &sensor_dev_attr_fan3_fault.dev_attr.attr,230 &sensor_dev_attr_fan4_speed.dev_attr.attr,231 &sensor_dev_attr_fan4_fault.dev_attr.attr,232 &sensor_dev_attr_psu_fan_fault.dev_attr.attr,233 &sensor_dev_attr_adt7462_local_temp.dev_attr.attr,234 &sensor_dev_attr_cpu0_temp.dev_attr.attr,235 &sensor_dev_attr_cpu1_temp.dev_attr.attr,236 &sensor_dev_attr_motherboard_temp.dev_attr.attr,237 &sensor_dev_attr_lm95221_local_temp.dev_attr.attr,238 &sensor_dev_attr_fire_temp.dev_attr.attr,239 &sensor_dev_attr_lsi1064_local_temp.dev_attr.attr,240 &sensor_dev_attr_front_panel_temp.dev_attr.attr,241 &sensor_dev_attr_psu_temp.dev_attr.attr,242 &sensor_dev_attr_fan_failure.dev_attr.attr,243 &sensor_dev_attr_env_bus_busy.dev_attr.attr,244 &sensor_dev_attr_env_data_stale.dev_attr.attr,245 &sensor_dev_attr_tpm_self_test_passed.dev_attr.attr,246 &sensor_dev_attr_firmware_version.dev_attr.attr,247 &sensor_dev_attr_name.dev_attr.attr,248 NULL,249};250 251static const struct attribute_group env_group = {252 .attrs = env_attributes,253};254 255static int env_probe(struct platform_device *op)256{257 struct env *p = devm_kzalloc(&op->dev, sizeof(*p), GFP_KERNEL);258 int err = -ENOMEM;259 260 if (!p)261 goto out;262 263 spin_lock_init(&p->lock);264 265 p->regs = of_ioremap(&op->resource[0], 0, REG_SIZE, "pic16f747");266 if (!p->regs)267 goto out;268 269 err = sysfs_create_group(&op->dev.kobj, &env_group);270 if (err)271 goto out_iounmap;272 273 p->hwmon_dev = hwmon_device_register(&op->dev);274 if (IS_ERR(p->hwmon_dev)) {275 err = PTR_ERR(p->hwmon_dev);276 goto out_sysfs_remove_group;277 }278 279 platform_set_drvdata(op, p);280 err = 0;281 282out:283 return err;284 285out_sysfs_remove_group:286 sysfs_remove_group(&op->dev.kobj, &env_group);287 288out_iounmap:289 of_iounmap(&op->resource[0], p->regs, REG_SIZE);290 291 goto out;292}293 294static void env_remove(struct platform_device *op)295{296 struct env *p = platform_get_drvdata(op);297 298 if (p) {299 sysfs_remove_group(&op->dev.kobj, &env_group);300 hwmon_device_unregister(p->hwmon_dev);301 of_iounmap(&op->resource[0], p->regs, REG_SIZE);302 }303}304 305static const struct of_device_id env_match[] = {306 {307 .name = "env-monitor",308 .compatible = "SUNW,ebus-pic16f747-env",309 },310 {},311};312MODULE_DEVICE_TABLE(of, env_match);313 314static struct platform_driver env_driver = {315 .driver = {316 .name = "ultra45_env",317 .of_match_table = env_match,318 },319 .probe = env_probe,320 .remove_new = env_remove,321};322 323module_platform_driver(env_driver);324