1 /* 2 * ultra45_env.c: Driver for Ultra45 PIC16F747 environmental monitor. 3 * 4 * Copyright (C) 2008 David S. Miller <davem@davemloft.net> 5 */ 6 7 #include <linux/kernel.h> 8 #include <linux/types.h> 9 #include <linux/slab.h> 10 #include <linux/module.h> 11 #include <linux/of_device.h> 12 #include <linux/io.h> 13 #include <linux/hwmon.h> 14 #include <linux/hwmon-sysfs.h> 15 #include <linux/err.h> 16 17 #define DRV_MODULE_VERSION "0.1" 18 19 MODULE_AUTHOR("David S. Miller (davem@davemloft.net)"); 20 MODULE_DESCRIPTION("Ultra45 environmental monitor driver"); 21 MODULE_LICENSE("GPL"); 22 MODULE_VERSION(DRV_MODULE_VERSION); 23 24 /* PIC device registers */ 25 #define REG_CMD 0x00UL 26 #define REG_CMD_RESET 0x80 27 #define REG_CMD_ESTAR 0x01 28 #define REG_STAT 0x01UL 29 #define REG_STAT_FWVER 0xf0 30 #define REG_STAT_TGOOD 0x08 31 #define REG_STAT_STALE 0x04 32 #define REG_STAT_BUSY 0x02 33 #define REG_STAT_FAULT 0x01 34 #define REG_DATA 0x40UL 35 #define REG_ADDR 0x41UL 36 #define REG_SIZE 0x42UL 37 38 /* Registers accessed indirectly via REG_DATA/REG_ADDR */ 39 #define IREG_FAN0 0x00 40 #define IREG_FAN1 0x01 41 #define IREG_FAN2 0x02 42 #define IREG_FAN3 0x03 43 #define IREG_FAN4 0x04 44 #define IREG_FAN5 0x05 45 #define IREG_LCL_TEMP 0x06 46 #define IREG_RMT1_TEMP 0x07 47 #define IREG_RMT2_TEMP 0x08 48 #define IREG_RMT3_TEMP 0x09 49 #define IREG_LM95221_TEMP 0x0a 50 #define IREG_FIRE_TEMP 0x0b 51 #define IREG_LSI1064_TEMP 0x0c 52 #define IREG_FRONT_TEMP 0x0d 53 #define IREG_FAN_STAT 0x0e 54 #define IREG_VCORE0 0x0f 55 #define IREG_VCORE1 0x10 56 #define IREG_VMEM0 0x11 57 #define IREG_VMEM1 0x12 58 #define IREG_PSU_TEMP 0x13 59 60 struct env { 61 void __iomem *regs; 62 spinlock_t lock; 63 64 struct device *hwmon_dev; 65 }; 66 67 static u8 env_read(struct env *p, u8 ireg) 68 { 69 u8 ret; 70 71 spin_lock(&p->lock); 72 writeb(ireg, p->regs + REG_ADDR); 73 ret = readb(p->regs + REG_DATA); 74 spin_unlock(&p->lock); 75 76 return ret; 77 } 78 79 static void env_write(struct env *p, u8 ireg, u8 val) 80 { 81 spin_lock(&p->lock); 82 writeb(ireg, p->regs + REG_ADDR); 83 writeb(val, p->regs + REG_DATA); 84 spin_unlock(&p->lock); 85 } 86 87 /* 88 * There seems to be a adr7462 providing these values, thus a lot 89 * of these calculations are borrowed from the adt7470 driver. 90 */ 91 #define FAN_PERIOD_TO_RPM(x) ((90000 * 60) / (x)) 92 #define FAN_RPM_TO_PERIOD FAN_PERIOD_TO_RPM 93 #define FAN_PERIOD_INVALID (0xff << 8) 94 #define FAN_DATA_VALID(x) ((x) && (x) != FAN_PERIOD_INVALID) 95 96 static ssize_t show_fan_speed(struct device *dev, struct device_attribute *attr, 97 char *buf) 98 { 99 int fan_nr = to_sensor_dev_attr(attr)->index; 100 struct env *p = dev_get_drvdata(dev); 101 int rpm, period; 102 u8 val; 103 104 val = env_read(p, IREG_FAN0 + fan_nr); 105 period = (int) val << 8; 106 if (FAN_DATA_VALID(period)) 107 rpm = FAN_PERIOD_TO_RPM(period); 108 else 109 rpm = 0; 110 111 return sprintf(buf, "%d\n", rpm); 112 } 113 114 static ssize_t set_fan_speed(struct device *dev, struct device_attribute *attr, 115 const char *buf, size_t count) 116 { 117 int fan_nr = to_sensor_dev_attr(attr)->index; 118 unsigned long rpm; 119 struct env *p = dev_get_drvdata(dev); 120 int period; 121 u8 val; 122 int err; 123 124 err = kstrtoul(buf, 10, &rpm); 125 if (err) 126 return err; 127 128 if (!rpm) 129 return -EINVAL; 130 131 period = FAN_RPM_TO_PERIOD(rpm); 132 val = period >> 8; 133 env_write(p, IREG_FAN0 + fan_nr, val); 134 135 return count; 136 } 137 138 static ssize_t show_fan_fault(struct device *dev, struct device_attribute *attr, 139 char *buf) 140 { 141 int fan_nr = to_sensor_dev_attr(attr)->index; 142 struct env *p = dev_get_drvdata(dev); 143 u8 val = env_read(p, IREG_FAN_STAT); 144 return sprintf(buf, "%d\n", (val & (1 << fan_nr)) ? 1 : 0); 145 } 146 147 #define fan(index) \ 148 static SENSOR_DEVICE_ATTR(fan##index##_speed, S_IRUGO | S_IWUSR, \ 149 show_fan_speed, set_fan_speed, index); \ 150 static SENSOR_DEVICE_ATTR(fan##index##_fault, S_IRUGO, \ 151 show_fan_fault, NULL, index) 152 153 fan(0); 154 fan(1); 155 fan(2); 156 fan(3); 157 fan(4); 158 159 static SENSOR_DEVICE_ATTR(psu_fan_fault, S_IRUGO, show_fan_fault, NULL, 6); 160 161 static ssize_t show_temp(struct device *dev, struct device_attribute *attr, 162 char *buf) 163 { 164 int temp_nr = to_sensor_dev_attr(attr)->index; 165 struct env *p = dev_get_drvdata(dev); 166 s8 val; 167 168 val = env_read(p, IREG_LCL_TEMP + temp_nr); 169 return sprintf(buf, "%d\n", ((int) val) - 64); 170 } 171 172 static SENSOR_DEVICE_ATTR(adt7462_local_temp, S_IRUGO, show_temp, NULL, 0); 173 static SENSOR_DEVICE_ATTR(cpu0_temp, S_IRUGO, show_temp, NULL, 1); 174 static SENSOR_DEVICE_ATTR(cpu1_temp, S_IRUGO, show_temp, NULL, 2); 175 static SENSOR_DEVICE_ATTR(motherboard_temp, S_IRUGO, show_temp, NULL, 3); 176 static SENSOR_DEVICE_ATTR(lm95221_local_temp, S_IRUGO, show_temp, NULL, 4); 177 static SENSOR_DEVICE_ATTR(fire_temp, S_IRUGO, show_temp, NULL, 5); 178 static SENSOR_DEVICE_ATTR(lsi1064_local_temp, S_IRUGO, show_temp, NULL, 6); 179 static SENSOR_DEVICE_ATTR(front_panel_temp, S_IRUGO, show_temp, NULL, 7); 180 static SENSOR_DEVICE_ATTR(psu_temp, S_IRUGO, show_temp, NULL, 13); 181 182 static ssize_t show_stat_bit(struct device *dev, struct device_attribute *attr, 183 char *buf) 184 { 185 int index = to_sensor_dev_attr(attr)->index; 186 struct env *p = dev_get_drvdata(dev); 187 u8 val; 188 189 val = readb(p->regs + REG_STAT); 190 return sprintf(buf, "%d\n", (val & (1 << index)) ? 1 : 0); 191 } 192 193 static SENSOR_DEVICE_ATTR(fan_failure, S_IRUGO, show_stat_bit, NULL, 0); 194 static SENSOR_DEVICE_ATTR(env_bus_busy, S_IRUGO, show_stat_bit, NULL, 1); 195 static SENSOR_DEVICE_ATTR(env_data_stale, S_IRUGO, show_stat_bit, NULL, 2); 196 static SENSOR_DEVICE_ATTR(tpm_self_test_passed, S_IRUGO, show_stat_bit, NULL, 197 3); 198 199 static ssize_t show_fwver(struct device *dev, struct device_attribute *attr, 200 char *buf) 201 { 202 struct env *p = dev_get_drvdata(dev); 203 u8 val; 204 205 val = readb(p->regs + REG_STAT); 206 return sprintf(buf, "%d\n", val >> 4); 207 } 208 209 static SENSOR_DEVICE_ATTR(firmware_version, S_IRUGO, show_fwver, NULL, 0); 210 211 static ssize_t show_name(struct device *dev, struct device_attribute *attr, 212 char *buf) 213 { 214 return sprintf(buf, "ultra45\n"); 215 } 216 217 static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0); 218 219 static struct attribute *env_attributes[] = { 220 &sensor_dev_attr_fan0_speed.dev_attr.attr, 221 &sensor_dev_attr_fan0_fault.dev_attr.attr, 222 &sensor_dev_attr_fan1_speed.dev_attr.attr, 223 &sensor_dev_attr_fan1_fault.dev_attr.attr, 224 &sensor_dev_attr_fan2_speed.dev_attr.attr, 225 &sensor_dev_attr_fan2_fault.dev_attr.attr, 226 &sensor_dev_attr_fan3_speed.dev_attr.attr, 227 &sensor_dev_attr_fan3_fault.dev_attr.attr, 228 &sensor_dev_attr_fan4_speed.dev_attr.attr, 229 &sensor_dev_attr_fan4_fault.dev_attr.attr, 230 &sensor_dev_attr_psu_fan_fault.dev_attr.attr, 231 &sensor_dev_attr_adt7462_local_temp.dev_attr.attr, 232 &sensor_dev_attr_cpu0_temp.dev_attr.attr, 233 &sensor_dev_attr_cpu1_temp.dev_attr.attr, 234 &sensor_dev_attr_motherboard_temp.dev_attr.attr, 235 &sensor_dev_attr_lm95221_local_temp.dev_attr.attr, 236 &sensor_dev_attr_fire_temp.dev_attr.attr, 237 &sensor_dev_attr_lsi1064_local_temp.dev_attr.attr, 238 &sensor_dev_attr_front_panel_temp.dev_attr.attr, 239 &sensor_dev_attr_psu_temp.dev_attr.attr, 240 &sensor_dev_attr_fan_failure.dev_attr.attr, 241 &sensor_dev_attr_env_bus_busy.dev_attr.attr, 242 &sensor_dev_attr_env_data_stale.dev_attr.attr, 243 &sensor_dev_attr_tpm_self_test_passed.dev_attr.attr, 244 &sensor_dev_attr_firmware_version.dev_attr.attr, 245 &sensor_dev_attr_name.dev_attr.attr, 246 NULL, 247 }; 248 249 static const struct attribute_group env_group = { 250 .attrs = env_attributes, 251 }; 252 253 static int env_probe(struct platform_device *op) 254 { 255 struct env *p = kzalloc(sizeof(*p), GFP_KERNEL); 256 int err = -ENOMEM; 257 258 if (!p) 259 goto out; 260 261 spin_lock_init(&p->lock); 262 263 p->regs = of_ioremap(&op->resource[0], 0, REG_SIZE, "pic16f747"); 264 if (!p->regs) 265 goto out_free; 266 267 err = sysfs_create_group(&op->dev.kobj, &env_group); 268 if (err) 269 goto out_iounmap; 270 271 p->hwmon_dev = hwmon_device_register(&op->dev); 272 if (IS_ERR(p->hwmon_dev)) { 273 err = PTR_ERR(p->hwmon_dev); 274 goto out_sysfs_remove_group; 275 } 276 277 platform_set_drvdata(op, p); 278 err = 0; 279 280 out: 281 return err; 282 283 out_sysfs_remove_group: 284 sysfs_remove_group(&op->dev.kobj, &env_group); 285 286 out_iounmap: 287 of_iounmap(&op->resource[0], p->regs, REG_SIZE); 288 289 out_free: 290 kfree(p); 291 goto out; 292 } 293 294 static int 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 kfree(p); 303 } 304 305 return 0; 306 } 307 308 static const struct of_device_id env_match[] = { 309 { 310 .name = "env-monitor", 311 .compatible = "SUNW,ebus-pic16f747-env", 312 }, 313 {}, 314 }; 315 MODULE_DEVICE_TABLE(of, env_match); 316 317 static struct platform_driver env_driver = { 318 .driver = { 319 .name = "ultra45_env", 320 .owner = THIS_MODULE, 321 .of_match_table = env_match, 322 }, 323 .probe = env_probe, 324 .remove = env_remove, 325 }; 326 327 module_platform_driver(env_driver); 328