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/delay.h> 16 #include <linux/err.h> 17 #include <linux/hwmon.h> 18 #include <linux/hwmon-sysfs.h> 19 #include <linux/init.h> 20 #include <linux/kernel.h> 21 #include <linux/module.h> 22 #include <linux/slab.h> 23 #include <linux/platform_device.h> 24 25 #include <linux/mfd/da9052/da9052.h> 26 #include <linux/mfd/da9052/reg.h> 27 28 struct da9052_hwmon { 29 struct da9052 *da9052; 30 struct device *class_device; 31 struct mutex hwmon_lock; 32 }; 33 34 static const char * const input_names[] = { 35 [DA9052_ADC_VDDOUT] = "VDDOUT", 36 [DA9052_ADC_ICH] = "CHARGING CURRENT", 37 [DA9052_ADC_TBAT] = "BATTERY TEMP", 38 [DA9052_ADC_VBAT] = "BATTERY VOLTAGE", 39 [DA9052_ADC_IN4] = "ADC IN4", 40 [DA9052_ADC_IN5] = "ADC IN5", 41 [DA9052_ADC_IN6] = "ADC IN6", 42 [DA9052_ADC_TJUNC] = "BATTERY JUNCTION TEMP", 43 [DA9052_ADC_VBBAT] = "BACK-UP BATTERY VOLTAGE", 44 }; 45 46 /* Conversion function for VDDOUT and VBAT */ 47 static inline int volt_reg_to_mV(int value) 48 { 49 return DIV_ROUND_CLOSEST(value * 1000, 512) + 2500; 50 } 51 52 /* Conversion function for ADC channels 4, 5 and 6 */ 53 static inline int input_reg_to_mV(int value) 54 { 55 return DIV_ROUND_CLOSEST(value * 2500, 1023); 56 } 57 58 /* Conversion function for VBBAT */ 59 static inline int vbbat_reg_to_mV(int value) 60 { 61 return DIV_ROUND_CLOSEST(value * 2500, 512); 62 } 63 64 static int da9052_enable_vddout_channel(struct da9052 *da9052) 65 { 66 int ret; 67 68 ret = da9052_reg_read(da9052, DA9052_ADC_CONT_REG); 69 if (ret < 0) 70 return ret; 71 72 ret |= DA9052_ADCCONT_AUTOVDDEN; 73 74 return da9052_reg_write(da9052, DA9052_ADC_CONT_REG, ret); 75 } 76 77 static int da9052_disable_vddout_channel(struct da9052 *da9052) 78 { 79 int ret; 80 81 ret = da9052_reg_read(da9052, DA9052_ADC_CONT_REG); 82 if (ret < 0) 83 return ret; 84 85 ret &= ~DA9052_ADCCONT_AUTOVDDEN; 86 87 return da9052_reg_write(da9052, DA9052_ADC_CONT_REG, ret); 88 } 89 90 static ssize_t da9052_read_vddout(struct device *dev, 91 struct device_attribute *devattr, char *buf) 92 { 93 struct da9052_hwmon *hwmon = dev_get_drvdata(dev); 94 int ret, vdd; 95 96 mutex_lock(&hwmon->hwmon_lock); 97 98 ret = da9052_enable_vddout_channel(hwmon->da9052); 99 if (ret < 0) 100 goto hwmon_err; 101 102 vdd = da9052_reg_read(hwmon->da9052, DA9052_VDD_RES_REG); 103 if (vdd < 0) { 104 ret = vdd; 105 goto hwmon_err_release; 106 } 107 108 ret = da9052_disable_vddout_channel(hwmon->da9052); 109 if (ret < 0) 110 goto hwmon_err; 111 112 mutex_unlock(&hwmon->hwmon_lock); 113 return sprintf(buf, "%d\n", volt_reg_to_mV(vdd)); 114 115 hwmon_err_release: 116 da9052_disable_vddout_channel(hwmon->da9052); 117 hwmon_err: 118 mutex_unlock(&hwmon->hwmon_lock); 119 return ret; 120 } 121 122 static ssize_t da9052_read_ich(struct device *dev, 123 struct device_attribute *devattr, char *buf) 124 { 125 struct da9052_hwmon *hwmon = dev_get_drvdata(dev); 126 int ret; 127 128 ret = da9052_reg_read(hwmon->da9052, DA9052_ICHG_AV_REG); 129 if (ret < 0) 130 return ret; 131 132 /* Equivalent to 3.9mA/bit in register ICHG_AV */ 133 return sprintf(buf, "%d\n", DIV_ROUND_CLOSEST(ret * 39, 10)); 134 } 135 136 static ssize_t da9052_read_tbat(struct device *dev, 137 struct device_attribute *devattr, char *buf) 138 { 139 struct da9052_hwmon *hwmon = dev_get_drvdata(dev); 140 141 return sprintf(buf, "%d\n", da9052_adc_read_temp(hwmon->da9052)); 142 } 143 144 static ssize_t da9052_read_vbat(struct device *dev, 145 struct device_attribute *devattr, char *buf) 146 { 147 struct da9052_hwmon *hwmon = dev_get_drvdata(dev); 148 int ret; 149 150 ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBAT); 151 if (ret < 0) 152 return ret; 153 154 return sprintf(buf, "%d\n", volt_reg_to_mV(ret)); 155 } 156 157 static ssize_t da9052_read_misc_channel(struct device *dev, 158 struct device_attribute *devattr, 159 char *buf) 160 { 161 struct da9052_hwmon *hwmon = dev_get_drvdata(dev); 162 int channel = to_sensor_dev_attr(devattr)->index; 163 int ret; 164 165 ret = da9052_adc_manual_read(hwmon->da9052, channel); 166 if (ret < 0) 167 return ret; 168 169 return sprintf(buf, "%d\n", input_reg_to_mV(ret)); 170 } 171 172 static ssize_t da9052_read_tjunc(struct device *dev, 173 struct device_attribute *devattr, char *buf) 174 { 175 struct da9052_hwmon *hwmon = dev_get_drvdata(dev); 176 int tjunc; 177 int toffset; 178 179 tjunc = da9052_reg_read(hwmon->da9052, DA9052_TJUNC_RES_REG); 180 if (tjunc < 0) 181 return tjunc; 182 183 toffset = da9052_reg_read(hwmon->da9052, DA9052_T_OFFSET_REG); 184 if (toffset < 0) 185 return toffset; 186 187 /* 188 * Degrees celsius = 1.708 * (TJUNC_RES - T_OFFSET) - 108.8 189 * T_OFFSET is a trim value used to improve accuracy of the result 190 */ 191 return sprintf(buf, "%d\n", 1708 * (tjunc - toffset) - 108800); 192 } 193 194 static ssize_t da9052_read_vbbat(struct device *dev, 195 struct device_attribute *devattr, char *buf) 196 { 197 struct da9052_hwmon *hwmon = dev_get_drvdata(dev); 198 int ret; 199 200 ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBBAT); 201 if (ret < 0) 202 return ret; 203 204 return sprintf(buf, "%d\n", vbbat_reg_to_mV(ret)); 205 } 206 207 static ssize_t da9052_hwmon_show_name(struct device *dev, 208 struct device_attribute *devattr, 209 char *buf) 210 { 211 return sprintf(buf, "da9052-hwmon\n"); 212 } 213 214 static ssize_t show_label(struct device *dev, 215 struct device_attribute *devattr, char *buf) 216 { 217 return sprintf(buf, "%s\n", 218 input_names[to_sensor_dev_attr(devattr)->index]); 219 } 220 221 static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, da9052_read_vddout, NULL, 222 DA9052_ADC_VDDOUT); 223 static SENSOR_DEVICE_ATTR(in0_label, S_IRUGO, show_label, NULL, 224 DA9052_ADC_VDDOUT); 225 static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, da9052_read_vbat, NULL, 226 DA9052_ADC_VBAT); 227 static SENSOR_DEVICE_ATTR(in3_label, S_IRUGO, show_label, NULL, 228 DA9052_ADC_VBAT); 229 static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, da9052_read_misc_channel, NULL, 230 DA9052_ADC_IN4); 231 static SENSOR_DEVICE_ATTR(in4_label, S_IRUGO, show_label, NULL, 232 DA9052_ADC_IN4); 233 static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, da9052_read_misc_channel, NULL, 234 DA9052_ADC_IN5); 235 static SENSOR_DEVICE_ATTR(in5_label, S_IRUGO, show_label, NULL, 236 DA9052_ADC_IN5); 237 static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, da9052_read_misc_channel, NULL, 238 DA9052_ADC_IN6); 239 static SENSOR_DEVICE_ATTR(in6_label, S_IRUGO, show_label, NULL, 240 DA9052_ADC_IN6); 241 static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, da9052_read_vbbat, NULL, 242 DA9052_ADC_VBBAT); 243 static SENSOR_DEVICE_ATTR(in9_label, S_IRUGO, show_label, NULL, 244 DA9052_ADC_VBBAT); 245 246 static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, da9052_read_ich, NULL, 247 DA9052_ADC_ICH); 248 static SENSOR_DEVICE_ATTR(curr1_label, S_IRUGO, show_label, NULL, 249 DA9052_ADC_ICH); 250 251 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, da9052_read_tbat, NULL, 252 DA9052_ADC_TBAT); 253 static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, show_label, NULL, 254 DA9052_ADC_TBAT); 255 static SENSOR_DEVICE_ATTR(temp8_input, S_IRUGO, da9052_read_tjunc, NULL, 256 DA9052_ADC_TJUNC); 257 static SENSOR_DEVICE_ATTR(temp8_label, S_IRUGO, show_label, NULL, 258 DA9052_ADC_TJUNC); 259 260 static DEVICE_ATTR(name, S_IRUGO, da9052_hwmon_show_name, NULL); 261 262 static struct attribute *da9052_attr[] = { 263 &dev_attr_name.attr, 264 &sensor_dev_attr_in0_input.dev_attr.attr, 265 &sensor_dev_attr_in0_label.dev_attr.attr, 266 &sensor_dev_attr_in3_input.dev_attr.attr, 267 &sensor_dev_attr_in3_label.dev_attr.attr, 268 &sensor_dev_attr_in4_input.dev_attr.attr, 269 &sensor_dev_attr_in4_label.dev_attr.attr, 270 &sensor_dev_attr_in5_input.dev_attr.attr, 271 &sensor_dev_attr_in5_label.dev_attr.attr, 272 &sensor_dev_attr_in6_input.dev_attr.attr, 273 &sensor_dev_attr_in6_label.dev_attr.attr, 274 &sensor_dev_attr_in9_input.dev_attr.attr, 275 &sensor_dev_attr_in9_label.dev_attr.attr, 276 &sensor_dev_attr_curr1_input.dev_attr.attr, 277 &sensor_dev_attr_curr1_label.dev_attr.attr, 278 &sensor_dev_attr_temp2_input.dev_attr.attr, 279 &sensor_dev_attr_temp2_label.dev_attr.attr, 280 &sensor_dev_attr_temp8_input.dev_attr.attr, 281 &sensor_dev_attr_temp8_label.dev_attr.attr, 282 NULL 283 }; 284 285 static const struct attribute_group da9052_attr_group = {.attrs = da9052_attr}; 286 287 static int __devinit da9052_hwmon_probe(struct platform_device *pdev) 288 { 289 struct da9052_hwmon *hwmon; 290 int ret; 291 292 hwmon = devm_kzalloc(&pdev->dev, sizeof(struct da9052_hwmon), 293 GFP_KERNEL); 294 if (!hwmon) 295 return -ENOMEM; 296 297 mutex_init(&hwmon->hwmon_lock); 298 hwmon->da9052 = dev_get_drvdata(pdev->dev.parent); 299 300 platform_set_drvdata(pdev, hwmon); 301 302 ret = sysfs_create_group(&pdev->dev.kobj, &da9052_attr_group); 303 if (ret) 304 goto err_mem; 305 306 hwmon->class_device = hwmon_device_register(&pdev->dev); 307 if (IS_ERR(hwmon->class_device)) { 308 ret = PTR_ERR(hwmon->class_device); 309 goto err_sysfs; 310 } 311 312 return 0; 313 314 err_sysfs: 315 sysfs_remove_group(&pdev->dev.kobj, &da9052_attr_group); 316 err_mem: 317 return ret; 318 } 319 320 static int __devexit da9052_hwmon_remove(struct platform_device *pdev) 321 { 322 struct da9052_hwmon *hwmon = platform_get_drvdata(pdev); 323 324 hwmon_device_unregister(hwmon->class_device); 325 sysfs_remove_group(&pdev->dev.kobj, &da9052_attr_group); 326 327 return 0; 328 } 329 330 static struct platform_driver da9052_hwmon_driver = { 331 .probe = da9052_hwmon_probe, 332 .remove = __devexit_p(da9052_hwmon_remove), 333 .driver = { 334 .name = "da9052-hwmon", 335 .owner = THIS_MODULE, 336 }, 337 }; 338 339 module_platform_driver(da9052_hwmon_driver); 340 341 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); 342 MODULE_DESCRIPTION("DA9052 HWMON driver"); 343 MODULE_LICENSE("GPL"); 344 MODULE_ALIAS("platform:da9052-hwmon"); 345