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 16 #define DRV_MODULE_VERSION "0.1" 17 18 MODULE_AUTHOR("David S. Miller (davem@davemloft.net)"); 19 MODULE_DESCRIPTION("Ultra45 environmental monitor driver"); 20 MODULE_LICENSE("GPL"); 21 MODULE_VERSION(DRV_MODULE_VERSION); 22 23 /* PIC device registers */ 24 #define REG_CMD 0x00UL 25 #define REG_CMD_RESET 0x80 26 #define REG_CMD_ESTAR 0x01 27 #define REG_STAT 0x01UL 28 #define REG_STAT_FWVER 0xf0 29 #define REG_STAT_TGOOD 0x08 30 #define REG_STAT_STALE 0x04 31 #define REG_STAT_BUSY 0x02 32 #define REG_STAT_FAULT 0x01 33 #define REG_DATA 0x40UL 34 #define REG_ADDR 0x41UL 35 #define REG_SIZE 0x42UL 36 37 /* Registers accessed indirectly via REG_DATA/REG_ADDR */ 38 #define IREG_FAN0 0x00 39 #define IREG_FAN1 0x01 40 #define IREG_FAN2 0x02 41 #define IREG_FAN3 0x03 42 #define IREG_FAN4 0x04 43 #define IREG_FAN5 0x05 44 #define IREG_LCL_TEMP 0x06 45 #define IREG_RMT1_TEMP 0x07 46 #define IREG_RMT2_TEMP 0x08 47 #define IREG_RMT3_TEMP 0x09 48 #define IREG_LM95221_TEMP 0x0a 49 #define IREG_FIRE_TEMP 0x0b 50 #define IREG_LSI1064_TEMP 0x0c 51 #define IREG_FRONT_TEMP 0x0d 52 #define IREG_FAN_STAT 0x0e 53 #define IREG_VCORE0 0x0f 54 #define IREG_VCORE1 0x10 55 #define IREG_VMEM0 0x11 56 #define IREG_VMEM1 0x12 57 #define IREG_PSU_TEMP 0x13 58 59 struct env { 60 void __iomem *regs; 61 spinlock_t lock; 62 63 struct device *hwmon_dev; 64 }; 65 66 static u8 env_read(struct env *p, u8 ireg) 67 { 68 u8 ret; 69 70 spin_lock(&p->lock); 71 writeb(ireg, p->regs + REG_ADDR); 72 ret = readb(p->regs + REG_DATA); 73 spin_unlock(&p->lock); 74 75 return ret; 76 } 77 78 static void env_write(struct env *p, u8 ireg, u8 val) 79 { 80 spin_lock(&p->lock); 81 writeb(ireg, p->regs + REG_ADDR); 82 writeb(val, p->regs + REG_DATA); 83 spin_unlock(&p->lock); 84 } 85 86 /* 87 * There seems to be a adr7462 providing these values, thus a lot 88 * of these calculations are borrowed from the adt7470 driver. 89 */ 90 #define FAN_PERIOD_TO_RPM(x) ((90000 * 60) / (x)) 91 #define FAN_RPM_TO_PERIOD FAN_PERIOD_TO_RPM 92 #define FAN_PERIOD_INVALID (0xff << 8) 93 #define FAN_DATA_VALID(x) ((x) && (x) != FAN_PERIOD_INVALID) 94 95 static ssize_t show_fan_speed(struct device *dev, struct device_attribute *attr, 96 char *buf) 97 { 98 int fan_nr = to_sensor_dev_attr(attr)->index; 99 struct env *p = dev_get_drvdata(dev); 100 int rpm, period; 101 u8 val; 102 103 val = env_read(p, IREG_FAN0 + fan_nr); 104 period = (int) val << 8; 105 if (FAN_DATA_VALID(period)) 106 rpm = FAN_PERIOD_TO_RPM(period); 107 else 108 rpm = 0; 109 110 return sprintf(buf, "%d\n", rpm); 111 } 112 113 static ssize_t set_fan_speed(struct device *dev, struct device_attribute *attr, 114 const char *buf, size_t count) 115 { 116 int fan_nr = to_sensor_dev_attr(attr)->index; 117 unsigned long rpm; 118 struct env *p = dev_get_drvdata(dev); 119 int period; 120 u8 val; 121 int err; 122 123 err = kstrtoul(buf, 10, &rpm); 124 if (err) 125 return err; 126 127 if (!rpm) 128 return -EINVAL; 129 130 period = FAN_RPM_TO_PERIOD(rpm); 131 val = period >> 8; 132 env_write(p, IREG_FAN0 + fan_nr, val); 133 134 return count; 135 } 136 137 static ssize_t show_fan_fault(struct device *dev, struct device_attribute *attr, 138 char *buf) 139 { 140 int fan_nr = to_sensor_dev_attr(attr)->index; 141 struct env *p = dev_get_drvdata(dev); 142 u8 val = env_read(p, IREG_FAN_STAT); 143 return sprintf(buf, "%d\n", (val & (1 << fan_nr)) ? 1 : 0); 144 } 145 146 #define fan(index) \ 147 static SENSOR_DEVICE_ATTR(fan##index##_speed, S_IRUGO | S_IWUSR, \ 148 show_fan_speed, set_fan_speed, index); \ 149 static SENSOR_DEVICE_ATTR(fan##index##_fault, S_IRUGO, \ 150 show_fan_fault, NULL, index) 151 152 fan(0); 153 fan(1); 154 fan(2); 155 fan(3); 156 fan(4); 157 158 static SENSOR_DEVICE_ATTR(psu_fan_fault, S_IRUGO, show_fan_fault, NULL, 6); 159 160 static ssize_t show_temp(struct device *dev, struct device_attribute *attr, 161 char *buf) 162 { 163 int temp_nr = to_sensor_dev_attr(attr)->index; 164 struct env *p = dev_get_drvdata(dev); 165 s8 val; 166 167 val = env_read(p, IREG_LCL_TEMP + temp_nr); 168 return sprintf(buf, "%d\n", ((int) val) - 64); 169 } 170 171 static SENSOR_DEVICE_ATTR(adt7462_local_temp, S_IRUGO, show_temp, NULL, 0); 172 static SENSOR_DEVICE_ATTR(cpu0_temp, S_IRUGO, show_temp, NULL, 1); 173 static SENSOR_DEVICE_ATTR(cpu1_temp, S_IRUGO, show_temp, NULL, 2); 174 static SENSOR_DEVICE_ATTR(motherboard_temp, S_IRUGO, show_temp, NULL, 3); 175 static SENSOR_DEVICE_ATTR(lm95221_local_temp, S_IRUGO, show_temp, NULL, 4); 176 static SENSOR_DEVICE_ATTR(fire_temp, S_IRUGO, show_temp, NULL, 5); 177 static SENSOR_DEVICE_ATTR(lsi1064_local_temp, S_IRUGO, show_temp, NULL, 6); 178 static SENSOR_DEVICE_ATTR(front_panel_temp, S_IRUGO, show_temp, NULL, 7); 179 static SENSOR_DEVICE_ATTR(psu_temp, S_IRUGO, show_temp, NULL, 13); 180 181 static ssize_t show_stat_bit(struct device *dev, struct device_attribute *attr, 182 char *buf) 183 { 184 int index = to_sensor_dev_attr(attr)->index; 185 struct env *p = dev_get_drvdata(dev); 186 u8 val; 187 188 val = readb(p->regs + REG_STAT); 189 return sprintf(buf, "%d\n", (val & (1 << index)) ? 1 : 0); 190 } 191 192 static SENSOR_DEVICE_ATTR(fan_failure, S_IRUGO, show_stat_bit, NULL, 0); 193 static SENSOR_DEVICE_ATTR(env_bus_busy, S_IRUGO, show_stat_bit, NULL, 1); 194 static SENSOR_DEVICE_ATTR(env_data_stale, S_IRUGO, show_stat_bit, NULL, 2); 195 static SENSOR_DEVICE_ATTR(tpm_self_test_passed, S_IRUGO, show_stat_bit, NULL, 196 3); 197 198 static ssize_t show_fwver(struct device *dev, struct device_attribute *attr, 199 char *buf) 200 { 201 struct env *p = dev_get_drvdata(dev); 202 u8 val; 203 204 val = readb(p->regs + REG_STAT); 205 return sprintf(buf, "%d\n", val >> 4); 206 } 207 208 static SENSOR_DEVICE_ATTR(firmware_version, S_IRUGO, show_fwver, NULL, 0); 209 210 static ssize_t show_name(struct device *dev, struct device_attribute *attr, 211 char *buf) 212 { 213 return sprintf(buf, "ultra45\n"); 214 } 215 216 static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0); 217 218 static struct attribute *env_attributes[] = { 219 &sensor_dev_attr_fan0_speed.dev_attr.attr, 220 &sensor_dev_attr_fan0_fault.dev_attr.attr, 221 &sensor_dev_attr_fan1_speed.dev_attr.attr, 222 &sensor_dev_attr_fan1_fault.dev_attr.attr, 223 &sensor_dev_attr_fan2_speed.dev_attr.attr, 224 &sensor_dev_attr_fan2_fault.dev_attr.attr, 225 &sensor_dev_attr_fan3_speed.dev_attr.attr, 226 &sensor_dev_attr_fan3_fault.dev_attr.attr, 227 &sensor_dev_attr_fan4_speed.dev_attr.attr, 228 &sensor_dev_attr_fan4_fault.dev_attr.attr, 229 &sensor_dev_attr_psu_fan_fault.dev_attr.attr, 230 &sensor_dev_attr_adt7462_local_temp.dev_attr.attr, 231 &sensor_dev_attr_cpu0_temp.dev_attr.attr, 232 &sensor_dev_attr_cpu1_temp.dev_attr.attr, 233 &sensor_dev_attr_motherboard_temp.dev_attr.attr, 234 &sensor_dev_attr_lm95221_local_temp.dev_attr.attr, 235 &sensor_dev_attr_fire_temp.dev_attr.attr, 236 &sensor_dev_attr_lsi1064_local_temp.dev_attr.attr, 237 &sensor_dev_attr_front_panel_temp.dev_attr.attr, 238 &sensor_dev_attr_psu_temp.dev_attr.attr, 239 &sensor_dev_attr_fan_failure.dev_attr.attr, 240 &sensor_dev_attr_env_bus_busy.dev_attr.attr, 241 &sensor_dev_attr_env_data_stale.dev_attr.attr, 242 &sensor_dev_attr_tpm_self_test_passed.dev_attr.attr, 243 &sensor_dev_attr_firmware_version.dev_attr.attr, 244 &sensor_dev_attr_name.dev_attr.attr, 245 NULL, 246 }; 247 248 static const struct attribute_group env_group = { 249 .attrs = env_attributes, 250 }; 251 252 static int __devinit env_probe(struct platform_device *op) 253 { 254 struct env *p = kzalloc(sizeof(*p), GFP_KERNEL); 255 int err = -ENOMEM; 256 257 if (!p) 258 goto out; 259 260 spin_lock_init(&p->lock); 261 262 p->regs = of_ioremap(&op->resource[0], 0, REG_SIZE, "pic16f747"); 263 if (!p->regs) 264 goto out_free; 265 266 err = sysfs_create_group(&op->dev.kobj, &env_group); 267 if (err) 268 goto out_iounmap; 269 270 p->hwmon_dev = hwmon_device_register(&op->dev); 271 if (IS_ERR(p->hwmon_dev)) { 272 err = PTR_ERR(p->hwmon_dev); 273 goto out_sysfs_remove_group; 274 } 275 276 platform_set_drvdata(op, p); 277 err = 0; 278 279 out: 280 return err; 281 282 out_sysfs_remove_group: 283 sysfs_remove_group(&op->dev.kobj, &env_group); 284 285 out_iounmap: 286 of_iounmap(&op->resource[0], p->regs, REG_SIZE); 287 288 out_free: 289 kfree(p); 290 goto out; 291 } 292 293 static int __devexit env_remove(struct platform_device *op) 294 { 295 struct env *p = platform_get_drvdata(op); 296 297 if (p) { 298 sysfs_remove_group(&op->dev.kobj, &env_group); 299 hwmon_device_unregister(p->hwmon_dev); 300 of_iounmap(&op->resource[0], p->regs, REG_SIZE); 301 kfree(p); 302 } 303 304 return 0; 305 } 306 307 static const struct of_device_id env_match[] = { 308 { 309 .name = "env-monitor", 310 .compatible = "SUNW,ebus-pic16f747-env", 311 }, 312 {}, 313 }; 314 MODULE_DEVICE_TABLE(of, env_match); 315 316 static struct platform_driver env_driver = { 317 .driver = { 318 .name = "ultra45_env", 319 .owner = THIS_MODULE, 320 .of_match_table = env_match, 321 }, 322 .probe = env_probe, 323 .remove = __devexit_p(env_remove), 324 }; 325 326 module_platform_driver(env_driver); 327