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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 | // SPDX-License-Identifier: GPL-2.0-only /* * Driver for Linear Technology LTC2990 power monitor * * Copyright (C) 2014 Topic Embedded Products * Author: Mike Looijmans <mike.looijmans@topic.nl> */ #include <linux/bitops.h> #include <linux/err.h> #include <linux/hwmon.h> #include <linux/hwmon-sysfs.h> #include <linux/i2c.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/property.h> #define LTC2990_STATUS 0x00 #define LTC2990_CONTROL 0x01 #define LTC2990_TRIGGER 0x02 #define LTC2990_TINT_MSB 0x04 #define LTC2990_V1_MSB 0x06 #define LTC2990_V2_MSB 0x08 #define LTC2990_V3_MSB 0x0A #define LTC2990_V4_MSB 0x0C #define LTC2990_VCC_MSB 0x0E #define LTC2990_IN0 BIT(0) #define LTC2990_IN1 BIT(1) #define LTC2990_IN2 BIT(2) #define LTC2990_IN3 BIT(3) #define LTC2990_IN4 BIT(4) #define LTC2990_CURR1 BIT(5) #define LTC2990_CURR2 BIT(6) #define LTC2990_TEMP1 BIT(7) #define LTC2990_TEMP2 BIT(8) #define LTC2990_TEMP3 BIT(9) #define LTC2990_NONE 0 #define LTC2990_ALL GENMASK(9, 0) #define LTC2990_MODE0_SHIFT 0 #define LTC2990_MODE0_MASK GENMASK(2, 0) #define LTC2990_MODE1_SHIFT 3 #define LTC2990_MODE1_MASK GENMASK(1, 0) /* Enabled measurements for mode bits 2..0 */ static const int ltc2990_attrs_ena_0[] = { LTC2990_IN1 | LTC2990_IN2 | LTC2990_TEMP3, LTC2990_CURR1 | LTC2990_TEMP3, LTC2990_CURR1 | LTC2990_IN3 | LTC2990_IN4, LTC2990_TEMP2 | LTC2990_IN3 | LTC2990_IN4, LTC2990_TEMP2 | LTC2990_CURR2, LTC2990_TEMP2 | LTC2990_TEMP3, LTC2990_CURR1 | LTC2990_CURR2, LTC2990_IN1 | LTC2990_IN2 | LTC2990_IN3 | LTC2990_IN4 }; /* Enabled measurements for mode bits 4..3 */ static const int ltc2990_attrs_ena_1[] = { LTC2990_NONE, LTC2990_TEMP2 | LTC2990_IN1 | LTC2990_CURR1, LTC2990_TEMP3 | LTC2990_IN3 | LTC2990_CURR2, LTC2990_ALL }; struct ltc2990_data { struct i2c_client *i2c; u32 mode[2]; }; /* Return the converted value from the given register in uV or mC */ static int ltc2990_get_value(struct i2c_client *i2c, int index, int *result) { int val; u8 reg; switch (index) { case LTC2990_IN0: reg = LTC2990_VCC_MSB; break; case LTC2990_IN1: case LTC2990_CURR1: case LTC2990_TEMP2: reg = LTC2990_V1_MSB; break; case LTC2990_IN2: reg = LTC2990_V2_MSB; break; case LTC2990_IN3: case LTC2990_CURR2: case LTC2990_TEMP3: reg = LTC2990_V3_MSB; break; case LTC2990_IN4: reg = LTC2990_V4_MSB; break; case LTC2990_TEMP1: reg = LTC2990_TINT_MSB; break; default: return -EINVAL; } val = i2c_smbus_read_word_swapped(i2c, reg); if (unlikely(val < 0)) return val; switch (index) { case LTC2990_TEMP1: case LTC2990_TEMP2: case LTC2990_TEMP3: /* temp, 0.0625 degrees/LSB */ *result = sign_extend32(val, 12) * 1000 / 16; break; case LTC2990_CURR1: case LTC2990_CURR2: /* Vx-Vy, 19.42uV/LSB */ *result = sign_extend32(val, 14) * 1942 / 100; break; case LTC2990_IN0: /* Vcc, 305.18uV/LSB, 2.5V offset */ *result = sign_extend32(val, 14) * 30518 / (100 * 1000) + 2500; break; case LTC2990_IN1: case LTC2990_IN2: case LTC2990_IN3: case LTC2990_IN4: /* Vx, 305.18uV/LSB */ *result = sign_extend32(val, 14) * 30518 / (100 * 1000); break; default: return -EINVAL; /* won't happen, keep compiler happy */ } return 0; } static ssize_t ltc2990_value_show(struct device *dev, struct device_attribute *da, char *buf) { struct sensor_device_attribute *attr = to_sensor_dev_attr(da); struct ltc2990_data *data = dev_get_drvdata(dev); int value; int ret; ret = ltc2990_get_value(data->i2c, attr->index, &value); if (unlikely(ret < 0)) return ret; return sysfs_emit(buf, "%d\n", value); } static umode_t ltc2990_attrs_visible(struct kobject *kobj, struct attribute *a, int n) { struct device *dev = kobj_to_dev(kobj); struct ltc2990_data *data = dev_get_drvdata(dev); struct device_attribute *da = container_of(a, struct device_attribute, attr); struct sensor_device_attribute *attr = to_sensor_dev_attr(da); int attrs_mask = LTC2990_IN0 | LTC2990_TEMP1 | (ltc2990_attrs_ena_0[data->mode[0]] & ltc2990_attrs_ena_1[data->mode[1]]); if (attr->index & attrs_mask) return a->mode; return 0; } static SENSOR_DEVICE_ATTR_RO(temp1_input, ltc2990_value, LTC2990_TEMP1); static SENSOR_DEVICE_ATTR_RO(temp2_input, ltc2990_value, LTC2990_TEMP2); static SENSOR_DEVICE_ATTR_RO(temp3_input, ltc2990_value, LTC2990_TEMP3); static SENSOR_DEVICE_ATTR_RO(curr1_input, ltc2990_value, LTC2990_CURR1); static SENSOR_DEVICE_ATTR_RO(curr2_input, ltc2990_value, LTC2990_CURR2); static SENSOR_DEVICE_ATTR_RO(in0_input, ltc2990_value, LTC2990_IN0); static SENSOR_DEVICE_ATTR_RO(in1_input, ltc2990_value, LTC2990_IN1); static SENSOR_DEVICE_ATTR_RO(in2_input, ltc2990_value, LTC2990_IN2); static SENSOR_DEVICE_ATTR_RO(in3_input, ltc2990_value, LTC2990_IN3); static SENSOR_DEVICE_ATTR_RO(in4_input, ltc2990_value, LTC2990_IN4); static struct attribute *ltc2990_attrs[] = { &sensor_dev_attr_temp1_input.dev_attr.attr, &sensor_dev_attr_temp2_input.dev_attr.attr, &sensor_dev_attr_temp3_input.dev_attr.attr, &sensor_dev_attr_curr1_input.dev_attr.attr, &sensor_dev_attr_curr2_input.dev_attr.attr, &sensor_dev_attr_in0_input.dev_attr.attr, &sensor_dev_attr_in1_input.dev_attr.attr, &sensor_dev_attr_in2_input.dev_attr.attr, &sensor_dev_attr_in3_input.dev_attr.attr, &sensor_dev_attr_in4_input.dev_attr.attr, NULL, }; static const struct attribute_group ltc2990_group = { .attrs = ltc2990_attrs, .is_visible = ltc2990_attrs_visible, }; __ATTRIBUTE_GROUPS(ltc2990); static int ltc2990_i2c_probe(struct i2c_client *i2c) { int ret; struct device *hwmon_dev; struct ltc2990_data *data; if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA)) return -ENODEV; data = devm_kzalloc(&i2c->dev, sizeof(struct ltc2990_data), GFP_KERNEL); if (unlikely(!data)) return -ENOMEM; data->i2c = i2c; if (dev_fwnode(&i2c->dev)) { ret = device_property_read_u32_array(&i2c->dev, "lltc,meas-mode", data->mode, 2); if (ret < 0) return ret; if (data->mode[0] & ~LTC2990_MODE0_MASK || data->mode[1] & ~LTC2990_MODE1_MASK) return -EINVAL; } else { ret = i2c_smbus_read_byte_data(i2c, LTC2990_CONTROL); if (ret < 0) return ret; data->mode[0] = ret >> LTC2990_MODE0_SHIFT & LTC2990_MODE0_MASK; data->mode[1] = ret >> LTC2990_MODE1_SHIFT & LTC2990_MODE1_MASK; } /* Setup continuous mode */ ret = i2c_smbus_write_byte_data(i2c, LTC2990_CONTROL, data->mode[0] << LTC2990_MODE0_SHIFT | data->mode[1] << LTC2990_MODE1_SHIFT); if (ret < 0) { dev_err(&i2c->dev, "Error: Failed to set control mode.\n"); return ret; } /* Trigger once to start continuous conversion */ ret = i2c_smbus_write_byte_data(i2c, LTC2990_TRIGGER, 1); if (ret < 0) { dev_err(&i2c->dev, "Error: Failed to start acquisition.\n"); return ret; } hwmon_dev = devm_hwmon_device_register_with_groups(&i2c->dev, i2c->name, data, ltc2990_groups); return PTR_ERR_OR_ZERO(hwmon_dev); } static const struct i2c_device_id ltc2990_i2c_id[] = { { "ltc2990", 0 }, {} }; MODULE_DEVICE_TABLE(i2c, ltc2990_i2c_id); static struct i2c_driver ltc2990_i2c_driver = { .driver = { .name = "ltc2990", }, .probe_new = ltc2990_i2c_probe, .id_table = ltc2990_i2c_id, }; module_i2c_driver(ltc2990_i2c_driver); MODULE_DESCRIPTION("LTC2990 Sensor Driver"); MODULE_AUTHOR("Topic Embedded Products"); MODULE_LICENSE("GPL v2"); |