1 /* ultra45_env.c: Driver for Ultra45 PIC16F747 environmental monitor. 2 * 3 * Copyright (C) 2008 David S. Miller <davem@davemloft.net> 4 */ 5 6 #include <linux/kernel.h> 7 #include <linux/types.h> 8 #include <linux/slab.h> 9 #include <linux/module.h> 10 #include <linux/of_device.h> 11 #include <linux/io.h> 12 #include <linux/hwmon.h> 13 #include <linux/hwmon-sysfs.h> 14 15 #define DRV_MODULE_VERSION "0.1" 16 17 MODULE_AUTHOR("David S. Miller (davem@davemloft.net)"); 18 MODULE_DESCRIPTION("Ultra45 environmental monitor driver"); 19 MODULE_LICENSE("GPL"); 20 MODULE_VERSION(DRV_MODULE_VERSION); 21 22 /* PIC device registers */ 23 #define REG_CMD 0x00UL 24 #define REG_CMD_RESET 0x80 25 #define REG_CMD_ESTAR 0x01 26 #define REG_STAT 0x01UL 27 #define REG_STAT_FWVER 0xf0 28 #define REG_STAT_TGOOD 0x08 29 #define REG_STAT_STALE 0x04 30 #define REG_STAT_BUSY 0x02 31 #define REG_STAT_FAULT 0x01 32 #define REG_DATA 0x40UL 33 #define REG_ADDR 0x41UL 34 #define REG_SIZE 0x42UL 35 36 /* Registers accessed indirectly via REG_DATA/REG_ADDR */ 37 #define IREG_FAN0 0x00 38 #define IREG_FAN1 0x01 39 #define IREG_FAN2 0x02 40 #define IREG_FAN3 0x03 41 #define IREG_FAN4 0x04 42 #define IREG_FAN5 0x05 43 #define IREG_LCL_TEMP 0x06 44 #define IREG_RMT1_TEMP 0x07 45 #define IREG_RMT2_TEMP 0x08 46 #define IREG_RMT3_TEMP 0x09 47 #define IREG_LM95221_TEMP 0x0a 48 #define IREG_FIRE_TEMP 0x0b 49 #define IREG_LSI1064_TEMP 0x0c 50 #define IREG_FRONT_TEMP 0x0d 51 #define IREG_FAN_STAT 0x0e 52 #define IREG_VCORE0 0x0f 53 #define IREG_VCORE1 0x10 54 #define IREG_VMEM0 0x11 55 #define IREG_VMEM1 0x12 56 #define IREG_PSU_TEMP 0x13 57 58 struct env { 59 void __iomem *regs; 60 spinlock_t lock; 61 62 struct device *hwmon_dev; 63 }; 64 65 static u8 env_read(struct env *p, u8 ireg) 66 { 67 u8 ret; 68 69 spin_lock(&p->lock); 70 writeb(ireg, p->regs + REG_ADDR); 71 ret = readb(p->regs + REG_DATA); 72 spin_unlock(&p->lock); 73 74 return ret; 75 } 76 77 static void env_write(struct env *p, u8 ireg, u8 val) 78 { 79 spin_lock(&p->lock); 80 writeb(ireg, p->regs + REG_ADDR); 81 writeb(val, p->regs + REG_DATA); 82 spin_unlock(&p->lock); 83 } 84 85 /* There seems to be a adr7462 providing these values, thus a lot 86 * of these calculations are borrowed from the adt7470 driver. 87 */ 88 #define FAN_PERIOD_TO_RPM(x) ((90000 * 60) / (x)) 89 #define FAN_RPM_TO_PERIOD FAN_PERIOD_TO_RPM 90 #define FAN_PERIOD_INVALID (0xff << 8) 91 #define FAN_DATA_VALID(x) ((x) && (x) != FAN_PERIOD_INVALID) 92 93 static ssize_t show_fan_speed(struct device *dev, struct device_attribute *attr, char *buf) 94 { 95 int fan_nr = to_sensor_dev_attr(attr)->index; 96 struct env *p = dev_get_drvdata(dev); 97 int rpm, period; 98 u8 val; 99 100 val = env_read(p, IREG_FAN0 + fan_nr); 101 period = (int) val << 8; 102 if (FAN_DATA_VALID(period)) 103 rpm = FAN_PERIOD_TO_RPM(period); 104 else 105 rpm = 0; 106 107 return sprintf(buf, "%d\n", rpm); 108 } 109 110 static ssize_t set_fan_speed(struct device *dev, struct device_attribute *attr, 111 const char *buf, size_t count) 112 { 113 int fan_nr = to_sensor_dev_attr(attr)->index; 114 int rpm = simple_strtol(buf, NULL, 10); 115 struct env *p = dev_get_drvdata(dev); 116 int period; 117 u8 val; 118 119 if (!rpm) 120 return -EINVAL; 121 122 period = FAN_RPM_TO_PERIOD(rpm); 123 val = period >> 8; 124 env_write(p, IREG_FAN0 + fan_nr, val); 125 126 return count; 127 } 128 129 static ssize_t show_fan_fault(struct device *dev, struct device_attribute *attr, char *buf) 130 { 131 int fan_nr = to_sensor_dev_attr(attr)->index; 132 struct env *p = dev_get_drvdata(dev); 133 u8 val = env_read(p, IREG_FAN_STAT); 134 return sprintf(buf, "%d\n", (val & (1 << fan_nr)) ? 1 : 0); 135 } 136 137 #define fan(index) \ 138 static SENSOR_DEVICE_ATTR(fan##index##_speed, S_IRUGO | S_IWUSR, \ 139 show_fan_speed, set_fan_speed, index); \ 140 static SENSOR_DEVICE_ATTR(fan##index##_fault, S_IRUGO, \ 141 show_fan_fault, NULL, index) 142 143 fan(0); 144 fan(1); 145 fan(2); 146 fan(3); 147 fan(4); 148 149 static SENSOR_DEVICE_ATTR(psu_fan_fault, S_IRUGO, show_fan_fault, NULL, 6); 150 151 static ssize_t show_temp(struct device *dev, struct device_attribute *attr, char *buf) 152 { 153 int temp_nr = to_sensor_dev_attr(attr)->index; 154 struct env *p = dev_get_drvdata(dev); 155 s8 val; 156 157 val = env_read(p, IREG_LCL_TEMP + temp_nr); 158 return sprintf(buf, "%d\n", ((int) val) - 64); 159 } 160 161 static SENSOR_DEVICE_ATTR(adt7462_local_temp, S_IRUGO, show_temp, NULL, 0); 162 static SENSOR_DEVICE_ATTR(cpu0_temp, S_IRUGO, show_temp, NULL, 1); 163 static SENSOR_DEVICE_ATTR(cpu1_temp, S_IRUGO, show_temp, NULL, 2); 164 static SENSOR_DEVICE_ATTR(motherboard_temp, S_IRUGO, show_temp, NULL, 3); 165 static SENSOR_DEVICE_ATTR(lm95221_local_temp, S_IRUGO, show_temp, NULL, 4); 166 static SENSOR_DEVICE_ATTR(fire_temp, S_IRUGO, show_temp, NULL, 5); 167 static SENSOR_DEVICE_ATTR(lsi1064_local_temp, S_IRUGO, show_temp, NULL, 6); 168 static SENSOR_DEVICE_ATTR(front_panel_temp, S_IRUGO, show_temp, NULL, 7); 169 static SENSOR_DEVICE_ATTR(psu_temp, S_IRUGO, show_temp, NULL, 13); 170 171 static ssize_t show_stat_bit(struct device *dev, struct device_attribute *attr, char *buf) 172 { 173 int index = to_sensor_dev_attr(attr)->index; 174 struct env *p = dev_get_drvdata(dev); 175 u8 val; 176 177 val = readb(p->regs + REG_STAT); 178 return sprintf(buf, "%d\n", (val & (1 << index)) ? 1 : 0); 179 } 180 181 static SENSOR_DEVICE_ATTR(fan_failure, S_IRUGO, show_stat_bit, NULL, 0); 182 static SENSOR_DEVICE_ATTR(env_bus_busy, S_IRUGO, show_stat_bit, NULL, 1); 183 static SENSOR_DEVICE_ATTR(env_data_stale, S_IRUGO, show_stat_bit, NULL, 2); 184 static SENSOR_DEVICE_ATTR(tpm_self_test_passed, S_IRUGO, show_stat_bit, NULL, 3); 185 186 static ssize_t show_fwver(struct device *dev, struct device_attribute *attr, char *buf) 187 { 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 >> 4); 193 } 194 195 static SENSOR_DEVICE_ATTR(firmware_version, S_IRUGO, show_fwver, NULL, 0); 196 197 static ssize_t show_name(struct device *dev, struct device_attribute *attr, char *buf) 198 { 199 return sprintf(buf, "ultra45\n"); 200 } 201 202 static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0); 203 204 static struct attribute *env_attributes[] = { 205 &sensor_dev_attr_fan0_speed.dev_attr.attr, 206 &sensor_dev_attr_fan0_fault.dev_attr.attr, 207 &sensor_dev_attr_fan1_speed.dev_attr.attr, 208 &sensor_dev_attr_fan1_fault.dev_attr.attr, 209 &sensor_dev_attr_fan2_speed.dev_attr.attr, 210 &sensor_dev_attr_fan2_fault.dev_attr.attr, 211 &sensor_dev_attr_fan3_speed.dev_attr.attr, 212 &sensor_dev_attr_fan3_fault.dev_attr.attr, 213 &sensor_dev_attr_fan4_speed.dev_attr.attr, 214 &sensor_dev_attr_fan4_fault.dev_attr.attr, 215 &sensor_dev_attr_psu_fan_fault.dev_attr.attr, 216 &sensor_dev_attr_adt7462_local_temp.dev_attr.attr, 217 &sensor_dev_attr_cpu0_temp.dev_attr.attr, 218 &sensor_dev_attr_cpu1_temp.dev_attr.attr, 219 &sensor_dev_attr_motherboard_temp.dev_attr.attr, 220 &sensor_dev_attr_lm95221_local_temp.dev_attr.attr, 221 &sensor_dev_attr_fire_temp.dev_attr.attr, 222 &sensor_dev_attr_lsi1064_local_temp.dev_attr.attr, 223 &sensor_dev_attr_front_panel_temp.dev_attr.attr, 224 &sensor_dev_attr_psu_temp.dev_attr.attr, 225 &sensor_dev_attr_fan_failure.dev_attr.attr, 226 &sensor_dev_attr_env_bus_busy.dev_attr.attr, 227 &sensor_dev_attr_env_data_stale.dev_attr.attr, 228 &sensor_dev_attr_tpm_self_test_passed.dev_attr.attr, 229 &sensor_dev_attr_firmware_version.dev_attr.attr, 230 &sensor_dev_attr_name.dev_attr.attr, 231 NULL, 232 }; 233 234 static const struct attribute_group env_group = { 235 .attrs = env_attributes, 236 }; 237 238 static int __devinit env_probe(struct platform_device *op) 239 { 240 struct env *p = kzalloc(sizeof(*p), GFP_KERNEL); 241 int err = -ENOMEM; 242 243 if (!p) 244 goto out; 245 246 spin_lock_init(&p->lock); 247 248 p->regs = of_ioremap(&op->resource[0], 0, REG_SIZE, "pic16f747"); 249 if (!p->regs) 250 goto out_free; 251 252 err = sysfs_create_group(&op->dev.kobj, &env_group); 253 if (err) 254 goto out_iounmap; 255 256 p->hwmon_dev = hwmon_device_register(&op->dev); 257 if (IS_ERR(p->hwmon_dev)) { 258 err = PTR_ERR(p->hwmon_dev); 259 goto out_sysfs_remove_group; 260 } 261 262 platform_set_drvdata(op, p); 263 err = 0; 264 265 out: 266 return err; 267 268 out_sysfs_remove_group: 269 sysfs_remove_group(&op->dev.kobj, &env_group); 270 271 out_iounmap: 272 of_iounmap(&op->resource[0], p->regs, REG_SIZE); 273 274 out_free: 275 kfree(p); 276 goto out; 277 } 278 279 static int __devexit env_remove(struct platform_device *op) 280 { 281 struct env *p = platform_get_drvdata(op); 282 283 if (p) { 284 sysfs_remove_group(&op->dev.kobj, &env_group); 285 hwmon_device_unregister(p->hwmon_dev); 286 of_iounmap(&op->resource[0], p->regs, REG_SIZE); 287 kfree(p); 288 } 289 290 return 0; 291 } 292 293 static const struct of_device_id env_match[] = { 294 { 295 .name = "env-monitor", 296 .compatible = "SUNW,ebus-pic16f747-env", 297 }, 298 {}, 299 }; 300 MODULE_DEVICE_TABLE(of, env_match); 301 302 static struct platform_driver env_driver = { 303 .driver = { 304 .name = "ultra45_env", 305 .owner = THIS_MODULE, 306 .of_match_table = env_match, 307 }, 308 .probe = env_probe, 309 .remove = __devexit_p(env_remove), 310 }; 311 312 module_platform_driver(env_driver); 313