1 /* 2 * HWMON Driver for Dialog DA9052 3 * 4 * Copyright(c) 2012 Dialog Semiconductor Ltd. 5 * 6 * Author: David Dajun Chen <dchen@diasemi.com> 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License as published by the 10 * Free Software Foundation; either version 2 of the License, or (at your 11 * option) any later version. 12 * 13 */ 14 15 #include <linux/err.h> 16 #include <linux/hwmon.h> 17 #include <linux/hwmon-sysfs.h> 18 #include <linux/init.h> 19 #include <linux/kernel.h> 20 #include <linux/module.h> 21 #include <linux/slab.h> 22 #include <linux/platform_device.h> 23 24 #include <linux/mfd/da9052/da9052.h> 25 #include <linux/mfd/da9052/reg.h> 26 27 struct da9052_hwmon { 28 struct da9052 *da9052; 29 struct mutex hwmon_lock; 30 }; 31 32 static const char * const input_names[] = { 33 [DA9052_ADC_VDDOUT] = "VDDOUT", 34 [DA9052_ADC_ICH] = "CHARGING CURRENT", 35 [DA9052_ADC_TBAT] = "BATTERY TEMP", 36 [DA9052_ADC_VBAT] = "BATTERY VOLTAGE", 37 [DA9052_ADC_IN4] = "ADC IN4", 38 [DA9052_ADC_IN5] = "ADC IN5", 39 [DA9052_ADC_IN6] = "ADC IN6", 40 [DA9052_ADC_TJUNC] = "BATTERY JUNCTION TEMP", 41 [DA9052_ADC_VBBAT] = "BACK-UP BATTERY VOLTAGE", 42 }; 43 44 /* Conversion function for VDDOUT and VBAT */ 45 static inline int volt_reg_to_mv(int value) 46 { 47 return DIV_ROUND_CLOSEST(value * 2000, 1023) + 2500; 48 } 49 50 /* Conversion function for ADC channels 4, 5 and 6 */ 51 static inline int input_reg_to_mv(int value) 52 { 53 return DIV_ROUND_CLOSEST(value * 2500, 1023); 54 } 55 56 /* Conversion function for VBBAT */ 57 static inline int vbbat_reg_to_mv(int value) 58 { 59 return DIV_ROUND_CLOSEST(value * 5000, 1023); 60 } 61 62 static inline int da9052_enable_vddout_channel(struct da9052 *da9052) 63 { 64 return da9052_reg_update(da9052, DA9052_ADC_CONT_REG, 65 DA9052_ADCCONT_AUTOVDDEN, 66 DA9052_ADCCONT_AUTOVDDEN); 67 } 68 69 static inline int da9052_disable_vddout_channel(struct da9052 *da9052) 70 { 71 return da9052_reg_update(da9052, DA9052_ADC_CONT_REG, 72 DA9052_ADCCONT_AUTOVDDEN, 0); 73 } 74 75 static ssize_t da9052_read_vddout(struct device *dev, 76 struct device_attribute *devattr, char *buf) 77 { 78 struct da9052_hwmon *hwmon = dev_get_drvdata(dev); 79 int ret, vdd; 80 81 mutex_lock(&hwmon->hwmon_lock); 82 83 ret = da9052_enable_vddout_channel(hwmon->da9052); 84 if (ret < 0) 85 goto hwmon_err; 86 87 vdd = da9052_reg_read(hwmon->da9052, DA9052_VDD_RES_REG); 88 if (vdd < 0) { 89 ret = vdd; 90 goto hwmon_err_release; 91 } 92 93 ret = da9052_disable_vddout_channel(hwmon->da9052); 94 if (ret < 0) 95 goto hwmon_err; 96 97 mutex_unlock(&hwmon->hwmon_lock); 98 return sprintf(buf, "%d\n", volt_reg_to_mv(vdd)); 99 100 hwmon_err_release: 101 da9052_disable_vddout_channel(hwmon->da9052); 102 hwmon_err: 103 mutex_unlock(&hwmon->hwmon_lock); 104 return ret; 105 } 106 107 static ssize_t da9052_read_ich(struct device *dev, 108 struct device_attribute *devattr, char *buf) 109 { 110 struct da9052_hwmon *hwmon = dev_get_drvdata(dev); 111 int ret; 112 113 ret = da9052_reg_read(hwmon->da9052, DA9052_ICHG_AV_REG); 114 if (ret < 0) 115 return ret; 116 117 /* Equivalent to 3.9mA/bit in register ICHG_AV */ 118 return sprintf(buf, "%d\n", DIV_ROUND_CLOSEST(ret * 39, 10)); 119 } 120 121 static ssize_t da9052_read_tbat(struct device *dev, 122 struct device_attribute *devattr, char *buf) 123 { 124 struct da9052_hwmon *hwmon = dev_get_drvdata(dev); 125 126 return sprintf(buf, "%d\n", da9052_adc_read_temp(hwmon->da9052)); 127 } 128 129 static ssize_t da9052_read_vbat(struct device *dev, 130 struct device_attribute *devattr, char *buf) 131 { 132 struct da9052_hwmon *hwmon = dev_get_drvdata(dev); 133 int ret; 134 135 ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBAT); 136 if (ret < 0) 137 return ret; 138 139 return sprintf(buf, "%d\n", volt_reg_to_mv(ret)); 140 } 141 142 static ssize_t da9052_read_misc_channel(struct device *dev, 143 struct device_attribute *devattr, 144 char *buf) 145 { 146 struct da9052_hwmon *hwmon = dev_get_drvdata(dev); 147 int channel = to_sensor_dev_attr(devattr)->index; 148 int ret; 149 150 ret = da9052_adc_manual_read(hwmon->da9052, channel); 151 if (ret < 0) 152 return ret; 153 154 return sprintf(buf, "%d\n", input_reg_to_mv(ret)); 155 } 156 157 static ssize_t da9052_read_tjunc(struct device *dev, 158 struct device_attribute *devattr, char *buf) 159 { 160 struct da9052_hwmon *hwmon = dev_get_drvdata(dev); 161 int tjunc; 162 int toffset; 163 164 tjunc = da9052_reg_read(hwmon->da9052, DA9052_TJUNC_RES_REG); 165 if (tjunc < 0) 166 return tjunc; 167 168 toffset = da9052_reg_read(hwmon->da9052, DA9052_T_OFFSET_REG); 169 if (toffset < 0) 170 return toffset; 171 172 /* 173 * Degrees celsius = 1.708 * (TJUNC_RES - T_OFFSET) - 108.8 174 * T_OFFSET is a trim value used to improve accuracy of the result 175 */ 176 return sprintf(buf, "%d\n", 1708 * (tjunc - toffset) - 108800); 177 } 178 179 static ssize_t da9052_read_vbbat(struct device *dev, 180 struct device_attribute *devattr, char *buf) 181 { 182 struct da9052_hwmon *hwmon = dev_get_drvdata(dev); 183 int ret; 184 185 ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBBAT); 186 if (ret < 0) 187 return ret; 188 189 return sprintf(buf, "%d\n", vbbat_reg_to_mv(ret)); 190 } 191 192 static ssize_t show_label(struct device *dev, 193 struct device_attribute *devattr, char *buf) 194 { 195 return sprintf(buf, "%s\n", 196 input_names[to_sensor_dev_attr(devattr)->index]); 197 } 198 199 static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, da9052_read_vddout, NULL, 200 DA9052_ADC_VDDOUT); 201 static SENSOR_DEVICE_ATTR(in0_label, S_IRUGO, show_label, NULL, 202 DA9052_ADC_VDDOUT); 203 static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, da9052_read_vbat, NULL, 204 DA9052_ADC_VBAT); 205 static SENSOR_DEVICE_ATTR(in3_label, S_IRUGO, show_label, NULL, 206 DA9052_ADC_VBAT); 207 static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, da9052_read_misc_channel, NULL, 208 DA9052_ADC_IN4); 209 static SENSOR_DEVICE_ATTR(in4_label, S_IRUGO, show_label, NULL, 210 DA9052_ADC_IN4); 211 static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, da9052_read_misc_channel, NULL, 212 DA9052_ADC_IN5); 213 static SENSOR_DEVICE_ATTR(in5_label, S_IRUGO, show_label, NULL, 214 DA9052_ADC_IN5); 215 static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, da9052_read_misc_channel, NULL, 216 DA9052_ADC_IN6); 217 static SENSOR_DEVICE_ATTR(in6_label, S_IRUGO, show_label, NULL, 218 DA9052_ADC_IN6); 219 static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, da9052_read_vbbat, NULL, 220 DA9052_ADC_VBBAT); 221 static SENSOR_DEVICE_ATTR(in9_label, S_IRUGO, show_label, NULL, 222 DA9052_ADC_VBBAT); 223 224 static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, da9052_read_ich, NULL, 225 DA9052_ADC_ICH); 226 static SENSOR_DEVICE_ATTR(curr1_label, S_IRUGO, show_label, NULL, 227 DA9052_ADC_ICH); 228 229 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, da9052_read_tbat, NULL, 230 DA9052_ADC_TBAT); 231 static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, show_label, NULL, 232 DA9052_ADC_TBAT); 233 static SENSOR_DEVICE_ATTR(temp8_input, S_IRUGO, da9052_read_tjunc, NULL, 234 DA9052_ADC_TJUNC); 235 static SENSOR_DEVICE_ATTR(temp8_label, S_IRUGO, show_label, NULL, 236 DA9052_ADC_TJUNC); 237 238 static struct attribute *da9052_attrs[] = { 239 &sensor_dev_attr_in0_input.dev_attr.attr, 240 &sensor_dev_attr_in0_label.dev_attr.attr, 241 &sensor_dev_attr_in3_input.dev_attr.attr, 242 &sensor_dev_attr_in3_label.dev_attr.attr, 243 &sensor_dev_attr_in4_input.dev_attr.attr, 244 &sensor_dev_attr_in4_label.dev_attr.attr, 245 &sensor_dev_attr_in5_input.dev_attr.attr, 246 &sensor_dev_attr_in5_label.dev_attr.attr, 247 &sensor_dev_attr_in6_input.dev_attr.attr, 248 &sensor_dev_attr_in6_label.dev_attr.attr, 249 &sensor_dev_attr_in9_input.dev_attr.attr, 250 &sensor_dev_attr_in9_label.dev_attr.attr, 251 &sensor_dev_attr_curr1_input.dev_attr.attr, 252 &sensor_dev_attr_curr1_label.dev_attr.attr, 253 &sensor_dev_attr_temp2_input.dev_attr.attr, 254 &sensor_dev_attr_temp2_label.dev_attr.attr, 255 &sensor_dev_attr_temp8_input.dev_attr.attr, 256 &sensor_dev_attr_temp8_label.dev_attr.attr, 257 NULL 258 }; 259 260 ATTRIBUTE_GROUPS(da9052); 261 262 static int da9052_hwmon_probe(struct platform_device *pdev) 263 { 264 struct device *dev = &pdev->dev; 265 struct da9052_hwmon *hwmon; 266 struct device *hwmon_dev; 267 268 hwmon = devm_kzalloc(dev, sizeof(struct da9052_hwmon), GFP_KERNEL); 269 if (!hwmon) 270 return -ENOMEM; 271 272 mutex_init(&hwmon->hwmon_lock); 273 hwmon->da9052 = dev_get_drvdata(pdev->dev.parent); 274 275 hwmon_dev = devm_hwmon_device_register_with_groups(dev, "da9052", 276 hwmon, 277 da9052_groups); 278 return PTR_ERR_OR_ZERO(hwmon_dev); 279 } 280 281 static struct platform_driver da9052_hwmon_driver = { 282 .probe = da9052_hwmon_probe, 283 .driver = { 284 .name = "da9052-hwmon", 285 }, 286 }; 287 288 module_platform_driver(da9052_hwmon_driver); 289 290 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); 291 MODULE_DESCRIPTION("DA9052 HWMON driver"); 292 MODULE_LICENSE("GPL"); 293 MODULE_ALIAS("platform:da9052-hwmon"); 294