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 device *class_device; 30 struct mutex hwmon_lock; 31 }; 32 33 static const char * const input_names[] = { 34 [DA9052_ADC_VDDOUT] = "VDDOUT", 35 [DA9052_ADC_ICH] = "CHARGING CURRENT", 36 [DA9052_ADC_TBAT] = "BATTERY TEMP", 37 [DA9052_ADC_VBAT] = "BATTERY VOLTAGE", 38 [DA9052_ADC_IN4] = "ADC IN4", 39 [DA9052_ADC_IN5] = "ADC IN5", 40 [DA9052_ADC_IN6] = "ADC IN6", 41 [DA9052_ADC_TJUNC] = "BATTERY JUNCTION TEMP", 42 [DA9052_ADC_VBBAT] = "BACK-UP BATTERY VOLTAGE", 43 }; 44 45 /* Conversion function for VDDOUT and VBAT */ 46 static inline int volt_reg_to_mv(int value) 47 { 48 return DIV_ROUND_CLOSEST(value * 1000, 512) + 2500; 49 } 50 51 /* Conversion function for ADC channels 4, 5 and 6 */ 52 static inline int input_reg_to_mv(int value) 53 { 54 return DIV_ROUND_CLOSEST(value * 2500, 1023); 55 } 56 57 /* Conversion function for VBBAT */ 58 static inline int vbbat_reg_to_mv(int value) 59 { 60 return DIV_ROUND_CLOSEST(value * 2500, 512); 61 } 62 63 static inline int da9052_enable_vddout_channel(struct da9052 *da9052) 64 { 65 return da9052_reg_update(da9052, DA9052_ADC_CONT_REG, 66 DA9052_ADCCONT_AUTOVDDEN, 67 DA9052_ADCCONT_AUTOVDDEN); 68 } 69 70 static inline int da9052_disable_vddout_channel(struct da9052 *da9052) 71 { 72 return da9052_reg_update(da9052, DA9052_ADC_CONT_REG, 73 DA9052_ADCCONT_AUTOVDDEN, 0); 74 } 75 76 static ssize_t da9052_read_vddout(struct device *dev, 77 struct device_attribute *devattr, char *buf) 78 { 79 struct da9052_hwmon *hwmon = dev_get_drvdata(dev); 80 int ret, vdd; 81 82 mutex_lock(&hwmon->hwmon_lock); 83 84 ret = da9052_enable_vddout_channel(hwmon->da9052); 85 if (ret < 0) 86 goto hwmon_err; 87 88 vdd = da9052_reg_read(hwmon->da9052, DA9052_VDD_RES_REG); 89 if (vdd < 0) { 90 ret = vdd; 91 goto hwmon_err_release; 92 } 93 94 ret = da9052_disable_vddout_channel(hwmon->da9052); 95 if (ret < 0) 96 goto hwmon_err; 97 98 mutex_unlock(&hwmon->hwmon_lock); 99 return sprintf(buf, "%d\n", volt_reg_to_mv(vdd)); 100 101 hwmon_err_release: 102 da9052_disable_vddout_channel(hwmon->da9052); 103 hwmon_err: 104 mutex_unlock(&hwmon->hwmon_lock); 105 return ret; 106 } 107 108 static ssize_t da9052_read_ich(struct device *dev, 109 struct device_attribute *devattr, char *buf) 110 { 111 struct da9052_hwmon *hwmon = dev_get_drvdata(dev); 112 int ret; 113 114 ret = da9052_reg_read(hwmon->da9052, DA9052_ICHG_AV_REG); 115 if (ret < 0) 116 return ret; 117 118 /* Equivalent to 3.9mA/bit in register ICHG_AV */ 119 return sprintf(buf, "%d\n", DIV_ROUND_CLOSEST(ret * 39, 10)); 120 } 121 122 static ssize_t da9052_read_tbat(struct device *dev, 123 struct device_attribute *devattr, char *buf) 124 { 125 struct da9052_hwmon *hwmon = dev_get_drvdata(dev); 126 127 return sprintf(buf, "%d\n", da9052_adc_read_temp(hwmon->da9052)); 128 } 129 130 static ssize_t da9052_read_vbat(struct device *dev, 131 struct device_attribute *devattr, char *buf) 132 { 133 struct da9052_hwmon *hwmon = dev_get_drvdata(dev); 134 int ret; 135 136 ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBAT); 137 if (ret < 0) 138 return ret; 139 140 return sprintf(buf, "%d\n", volt_reg_to_mv(ret)); 141 } 142 143 static ssize_t da9052_read_misc_channel(struct device *dev, 144 struct device_attribute *devattr, 145 char *buf) 146 { 147 struct da9052_hwmon *hwmon = dev_get_drvdata(dev); 148 int channel = to_sensor_dev_attr(devattr)->index; 149 int ret; 150 151 ret = da9052_adc_manual_read(hwmon->da9052, channel); 152 if (ret < 0) 153 return ret; 154 155 return sprintf(buf, "%d\n", input_reg_to_mv(ret)); 156 } 157 158 static ssize_t da9052_read_tjunc(struct device *dev, 159 struct device_attribute *devattr, char *buf) 160 { 161 struct da9052_hwmon *hwmon = dev_get_drvdata(dev); 162 int tjunc; 163 int toffset; 164 165 tjunc = da9052_reg_read(hwmon->da9052, DA9052_TJUNC_RES_REG); 166 if (tjunc < 0) 167 return tjunc; 168 169 toffset = da9052_reg_read(hwmon->da9052, DA9052_T_OFFSET_REG); 170 if (toffset < 0) 171 return toffset; 172 173 /* 174 * Degrees celsius = 1.708 * (TJUNC_RES - T_OFFSET) - 108.8 175 * T_OFFSET is a trim value used to improve accuracy of the result 176 */ 177 return sprintf(buf, "%d\n", 1708 * (tjunc - toffset) - 108800); 178 } 179 180 static ssize_t da9052_read_vbbat(struct device *dev, 181 struct device_attribute *devattr, char *buf) 182 { 183 struct da9052_hwmon *hwmon = dev_get_drvdata(dev); 184 int ret; 185 186 ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBBAT); 187 if (ret < 0) 188 return ret; 189 190 return sprintf(buf, "%d\n", vbbat_reg_to_mv(ret)); 191 } 192 193 static ssize_t da9052_hwmon_show_name(struct device *dev, 194 struct device_attribute *devattr, 195 char *buf) 196 { 197 return sprintf(buf, "da9052-hwmon\n"); 198 } 199 200 static ssize_t show_label(struct device *dev, 201 struct device_attribute *devattr, char *buf) 202 { 203 return sprintf(buf, "%s\n", 204 input_names[to_sensor_dev_attr(devattr)->index]); 205 } 206 207 static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, da9052_read_vddout, NULL, 208 DA9052_ADC_VDDOUT); 209 static SENSOR_DEVICE_ATTR(in0_label, S_IRUGO, show_label, NULL, 210 DA9052_ADC_VDDOUT); 211 static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, da9052_read_vbat, NULL, 212 DA9052_ADC_VBAT); 213 static SENSOR_DEVICE_ATTR(in3_label, S_IRUGO, show_label, NULL, 214 DA9052_ADC_VBAT); 215 static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, da9052_read_misc_channel, NULL, 216 DA9052_ADC_IN4); 217 static SENSOR_DEVICE_ATTR(in4_label, S_IRUGO, show_label, NULL, 218 DA9052_ADC_IN4); 219 static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, da9052_read_misc_channel, NULL, 220 DA9052_ADC_IN5); 221 static SENSOR_DEVICE_ATTR(in5_label, S_IRUGO, show_label, NULL, 222 DA9052_ADC_IN5); 223 static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, da9052_read_misc_channel, NULL, 224 DA9052_ADC_IN6); 225 static SENSOR_DEVICE_ATTR(in6_label, S_IRUGO, show_label, NULL, 226 DA9052_ADC_IN6); 227 static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, da9052_read_vbbat, NULL, 228 DA9052_ADC_VBBAT); 229 static SENSOR_DEVICE_ATTR(in9_label, S_IRUGO, show_label, NULL, 230 DA9052_ADC_VBBAT); 231 232 static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, da9052_read_ich, NULL, 233 DA9052_ADC_ICH); 234 static SENSOR_DEVICE_ATTR(curr1_label, S_IRUGO, show_label, NULL, 235 DA9052_ADC_ICH); 236 237 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, da9052_read_tbat, NULL, 238 DA9052_ADC_TBAT); 239 static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, show_label, NULL, 240 DA9052_ADC_TBAT); 241 static SENSOR_DEVICE_ATTR(temp8_input, S_IRUGO, da9052_read_tjunc, NULL, 242 DA9052_ADC_TJUNC); 243 static SENSOR_DEVICE_ATTR(temp8_label, S_IRUGO, show_label, NULL, 244 DA9052_ADC_TJUNC); 245 246 static DEVICE_ATTR(name, S_IRUGO, da9052_hwmon_show_name, NULL); 247 248 static struct attribute *da9052_attr[] = { 249 &dev_attr_name.attr, 250 &sensor_dev_attr_in0_input.dev_attr.attr, 251 &sensor_dev_attr_in0_label.dev_attr.attr, 252 &sensor_dev_attr_in3_input.dev_attr.attr, 253 &sensor_dev_attr_in3_label.dev_attr.attr, 254 &sensor_dev_attr_in4_input.dev_attr.attr, 255 &sensor_dev_attr_in4_label.dev_attr.attr, 256 &sensor_dev_attr_in5_input.dev_attr.attr, 257 &sensor_dev_attr_in5_label.dev_attr.attr, 258 &sensor_dev_attr_in6_input.dev_attr.attr, 259 &sensor_dev_attr_in6_label.dev_attr.attr, 260 &sensor_dev_attr_in9_input.dev_attr.attr, 261 &sensor_dev_attr_in9_label.dev_attr.attr, 262 &sensor_dev_attr_curr1_input.dev_attr.attr, 263 &sensor_dev_attr_curr1_label.dev_attr.attr, 264 &sensor_dev_attr_temp2_input.dev_attr.attr, 265 &sensor_dev_attr_temp2_label.dev_attr.attr, 266 &sensor_dev_attr_temp8_input.dev_attr.attr, 267 &sensor_dev_attr_temp8_label.dev_attr.attr, 268 NULL 269 }; 270 271 static const struct attribute_group da9052_attr_group = {.attrs = da9052_attr}; 272 273 static int da9052_hwmon_probe(struct platform_device *pdev) 274 { 275 struct da9052_hwmon *hwmon; 276 int ret; 277 278 hwmon = devm_kzalloc(&pdev->dev, sizeof(struct da9052_hwmon), 279 GFP_KERNEL); 280 if (!hwmon) 281 return -ENOMEM; 282 283 mutex_init(&hwmon->hwmon_lock); 284 hwmon->da9052 = dev_get_drvdata(pdev->dev.parent); 285 286 platform_set_drvdata(pdev, hwmon); 287 288 ret = sysfs_create_group(&pdev->dev.kobj, &da9052_attr_group); 289 if (ret) 290 goto err_mem; 291 292 hwmon->class_device = hwmon_device_register(&pdev->dev); 293 if (IS_ERR(hwmon->class_device)) { 294 ret = PTR_ERR(hwmon->class_device); 295 goto err_sysfs; 296 } 297 298 return 0; 299 300 err_sysfs: 301 sysfs_remove_group(&pdev->dev.kobj, &da9052_attr_group); 302 err_mem: 303 return ret; 304 } 305 306 static int da9052_hwmon_remove(struct platform_device *pdev) 307 { 308 struct da9052_hwmon *hwmon = platform_get_drvdata(pdev); 309 310 hwmon_device_unregister(hwmon->class_device); 311 sysfs_remove_group(&pdev->dev.kobj, &da9052_attr_group); 312 313 return 0; 314 } 315 316 static struct platform_driver da9052_hwmon_driver = { 317 .probe = da9052_hwmon_probe, 318 .remove = da9052_hwmon_remove, 319 .driver = { 320 .name = "da9052-hwmon", 321 .owner = THIS_MODULE, 322 }, 323 }; 324 325 module_platform_driver(da9052_hwmon_driver); 326 327 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); 328 MODULE_DESCRIPTION("DA9052 HWMON driver"); 329 MODULE_LICENSE("GPL"); 330 MODULE_ALIAS("platform:da9052-hwmon"); 331