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 int da9052_enable_vddout_channel(struct da9052 *da9052) 64 { 65 int ret; 66 67 ret = da9052_reg_read(da9052, DA9052_ADC_CONT_REG); 68 if (ret < 0) 69 return ret; 70 71 ret |= DA9052_ADCCONT_AUTOVDDEN; 72 73 return da9052_reg_write(da9052, DA9052_ADC_CONT_REG, ret); 74 } 75 76 static int da9052_disable_vddout_channel(struct da9052 *da9052) 77 { 78 int ret; 79 80 ret = da9052_reg_read(da9052, DA9052_ADC_CONT_REG); 81 if (ret < 0) 82 return ret; 83 84 ret &= ~DA9052_ADCCONT_AUTOVDDEN; 85 86 return da9052_reg_write(da9052, DA9052_ADC_CONT_REG, ret); 87 } 88 89 static ssize_t da9052_read_vddout(struct device *dev, 90 struct device_attribute *devattr, char *buf) 91 { 92 struct da9052_hwmon *hwmon = dev_get_drvdata(dev); 93 int ret, vdd; 94 95 mutex_lock(&hwmon->hwmon_lock); 96 97 ret = da9052_enable_vddout_channel(hwmon->da9052); 98 if (ret < 0) 99 goto hwmon_err; 100 101 vdd = da9052_reg_read(hwmon->da9052, DA9052_VDD_RES_REG); 102 if (vdd < 0) { 103 ret = vdd; 104 goto hwmon_err_release; 105 } 106 107 ret = da9052_disable_vddout_channel(hwmon->da9052); 108 if (ret < 0) 109 goto hwmon_err; 110 111 mutex_unlock(&hwmon->hwmon_lock); 112 return sprintf(buf, "%d\n", volt_reg_to_mV(vdd)); 113 114 hwmon_err_release: 115 da9052_disable_vddout_channel(hwmon->da9052); 116 hwmon_err: 117 mutex_unlock(&hwmon->hwmon_lock); 118 return ret; 119 } 120 121 static ssize_t da9052_read_ich(struct device *dev, 122 struct device_attribute *devattr, char *buf) 123 { 124 struct da9052_hwmon *hwmon = dev_get_drvdata(dev); 125 int ret; 126 127 ret = da9052_reg_read(hwmon->da9052, DA9052_ICHG_AV_REG); 128 if (ret < 0) 129 return ret; 130 131 /* Equivalent to 3.9mA/bit in register ICHG_AV */ 132 return sprintf(buf, "%d\n", DIV_ROUND_CLOSEST(ret * 39, 10)); 133 } 134 135 static ssize_t da9052_read_tbat(struct device *dev, 136 struct device_attribute *devattr, char *buf) 137 { 138 struct da9052_hwmon *hwmon = dev_get_drvdata(dev); 139 140 return sprintf(buf, "%d\n", da9052_adc_read_temp(hwmon->da9052)); 141 } 142 143 static ssize_t da9052_read_vbat(struct device *dev, 144 struct device_attribute *devattr, char *buf) 145 { 146 struct da9052_hwmon *hwmon = dev_get_drvdata(dev); 147 int ret; 148 149 ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBAT); 150 if (ret < 0) 151 return ret; 152 153 return sprintf(buf, "%d\n", volt_reg_to_mV(ret)); 154 } 155 156 static ssize_t da9052_read_misc_channel(struct device *dev, 157 struct device_attribute *devattr, 158 char *buf) 159 { 160 struct da9052_hwmon *hwmon = dev_get_drvdata(dev); 161 int channel = to_sensor_dev_attr(devattr)->index; 162 int ret; 163 164 ret = da9052_adc_manual_read(hwmon->da9052, channel); 165 if (ret < 0) 166 return ret; 167 168 return sprintf(buf, "%d\n", input_reg_to_mV(ret)); 169 } 170 171 static ssize_t da9052_read_tjunc(struct device *dev, 172 struct device_attribute *devattr, char *buf) 173 { 174 struct da9052_hwmon *hwmon = dev_get_drvdata(dev); 175 int tjunc; 176 int toffset; 177 178 tjunc = da9052_reg_read(hwmon->da9052, DA9052_TJUNC_RES_REG); 179 if (tjunc < 0) 180 return tjunc; 181 182 toffset = da9052_reg_read(hwmon->da9052, DA9052_T_OFFSET_REG); 183 if (toffset < 0) 184 return toffset; 185 186 /* 187 * Degrees celsius = 1.708 * (TJUNC_RES - T_OFFSET) - 108.8 188 * T_OFFSET is a trim value used to improve accuracy of the result 189 */ 190 return sprintf(buf, "%d\n", 1708 * (tjunc - toffset) - 108800); 191 } 192 193 static ssize_t da9052_read_vbbat(struct device *dev, 194 struct device_attribute *devattr, char *buf) 195 { 196 struct da9052_hwmon *hwmon = dev_get_drvdata(dev); 197 int ret; 198 199 ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBBAT); 200 if (ret < 0) 201 return ret; 202 203 return sprintf(buf, "%d\n", vbbat_reg_to_mV(ret)); 204 } 205 206 static ssize_t da9052_hwmon_show_name(struct device *dev, 207 struct device_attribute *devattr, 208 char *buf) 209 { 210 return sprintf(buf, "da9052-hwmon\n"); 211 } 212 213 static ssize_t show_label(struct device *dev, 214 struct device_attribute *devattr, char *buf) 215 { 216 return sprintf(buf, "%s\n", 217 input_names[to_sensor_dev_attr(devattr)->index]); 218 } 219 220 static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, da9052_read_vddout, NULL, 221 DA9052_ADC_VDDOUT); 222 static SENSOR_DEVICE_ATTR(in0_label, S_IRUGO, show_label, NULL, 223 DA9052_ADC_VDDOUT); 224 static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, da9052_read_vbat, NULL, 225 DA9052_ADC_VBAT); 226 static SENSOR_DEVICE_ATTR(in3_label, S_IRUGO, show_label, NULL, 227 DA9052_ADC_VBAT); 228 static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, da9052_read_misc_channel, NULL, 229 DA9052_ADC_IN4); 230 static SENSOR_DEVICE_ATTR(in4_label, S_IRUGO, show_label, NULL, 231 DA9052_ADC_IN4); 232 static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, da9052_read_misc_channel, NULL, 233 DA9052_ADC_IN5); 234 static SENSOR_DEVICE_ATTR(in5_label, S_IRUGO, show_label, NULL, 235 DA9052_ADC_IN5); 236 static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, da9052_read_misc_channel, NULL, 237 DA9052_ADC_IN6); 238 static SENSOR_DEVICE_ATTR(in6_label, S_IRUGO, show_label, NULL, 239 DA9052_ADC_IN6); 240 static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, da9052_read_vbbat, NULL, 241 DA9052_ADC_VBBAT); 242 static SENSOR_DEVICE_ATTR(in9_label, S_IRUGO, show_label, NULL, 243 DA9052_ADC_VBBAT); 244 245 static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, da9052_read_ich, NULL, 246 DA9052_ADC_ICH); 247 static SENSOR_DEVICE_ATTR(curr1_label, S_IRUGO, show_label, NULL, 248 DA9052_ADC_ICH); 249 250 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, da9052_read_tbat, NULL, 251 DA9052_ADC_TBAT); 252 static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, show_label, NULL, 253 DA9052_ADC_TBAT); 254 static SENSOR_DEVICE_ATTR(temp8_input, S_IRUGO, da9052_read_tjunc, NULL, 255 DA9052_ADC_TJUNC); 256 static SENSOR_DEVICE_ATTR(temp8_label, S_IRUGO, show_label, NULL, 257 DA9052_ADC_TJUNC); 258 259 static DEVICE_ATTR(name, S_IRUGO, da9052_hwmon_show_name, NULL); 260 261 static struct attribute *da9052_attr[] = { 262 &dev_attr_name.attr, 263 &sensor_dev_attr_in0_input.dev_attr.attr, 264 &sensor_dev_attr_in0_label.dev_attr.attr, 265 &sensor_dev_attr_in3_input.dev_attr.attr, 266 &sensor_dev_attr_in3_label.dev_attr.attr, 267 &sensor_dev_attr_in4_input.dev_attr.attr, 268 &sensor_dev_attr_in4_label.dev_attr.attr, 269 &sensor_dev_attr_in5_input.dev_attr.attr, 270 &sensor_dev_attr_in5_label.dev_attr.attr, 271 &sensor_dev_attr_in6_input.dev_attr.attr, 272 &sensor_dev_attr_in6_label.dev_attr.attr, 273 &sensor_dev_attr_in9_input.dev_attr.attr, 274 &sensor_dev_attr_in9_label.dev_attr.attr, 275 &sensor_dev_attr_curr1_input.dev_attr.attr, 276 &sensor_dev_attr_curr1_label.dev_attr.attr, 277 &sensor_dev_attr_temp2_input.dev_attr.attr, 278 &sensor_dev_attr_temp2_label.dev_attr.attr, 279 &sensor_dev_attr_temp8_input.dev_attr.attr, 280 &sensor_dev_attr_temp8_label.dev_attr.attr, 281 NULL 282 }; 283 284 static const struct attribute_group da9052_attr_group = {.attrs = da9052_attr}; 285 286 static int __devinit da9052_hwmon_probe(struct platform_device *pdev) 287 { 288 struct da9052_hwmon *hwmon; 289 int ret; 290 291 hwmon = devm_kzalloc(&pdev->dev, sizeof(struct da9052_hwmon), 292 GFP_KERNEL); 293 if (!hwmon) 294 return -ENOMEM; 295 296 mutex_init(&hwmon->hwmon_lock); 297 hwmon->da9052 = dev_get_drvdata(pdev->dev.parent); 298 299 platform_set_drvdata(pdev, hwmon); 300 301 ret = sysfs_create_group(&pdev->dev.kobj, &da9052_attr_group); 302 if (ret) 303 goto err_mem; 304 305 hwmon->class_device = hwmon_device_register(&pdev->dev); 306 if (IS_ERR(hwmon->class_device)) { 307 ret = PTR_ERR(hwmon->class_device); 308 goto err_sysfs; 309 } 310 311 return 0; 312 313 err_sysfs: 314 sysfs_remove_group(&pdev->dev.kobj, &da9052_attr_group); 315 err_mem: 316 return ret; 317 } 318 319 static int __devexit da9052_hwmon_remove(struct platform_device *pdev) 320 { 321 struct da9052_hwmon *hwmon = platform_get_drvdata(pdev); 322 323 hwmon_device_unregister(hwmon->class_device); 324 sysfs_remove_group(&pdev->dev.kobj, &da9052_attr_group); 325 326 return 0; 327 } 328 329 static struct platform_driver da9052_hwmon_driver = { 330 .probe = da9052_hwmon_probe, 331 .remove = __devexit_p(da9052_hwmon_remove), 332 .driver = { 333 .name = "da9052-hwmon", 334 .owner = THIS_MODULE, 335 }, 336 }; 337 338 module_platform_driver(da9052_hwmon_driver); 339 340 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); 341 MODULE_DESCRIPTION("DA9052 HWMON driver"); 342 MODULE_LICENSE("GPL"); 343 MODULE_ALIAS("platform:da9052-hwmon"); 344