Ashish Jangam | e41f643 | 2012-03-17 15:34:41 +0530 | [diff] [blame^] | 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"); |