1 /* 2 * HWMON Driver for Dialog DA9055 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/platform_device.h> 23 #include <linux/completion.h> 24 25 #include <linux/mfd/da9055/core.h> 26 #include <linux/mfd/da9055/reg.h> 27 28 #define DA9055_ADCIN_DIV 102 29 #define DA9055_VSYS_DIV 85 30 31 #define DA9055_ADC_VSYS 0 32 #define DA9055_ADC_ADCIN1 1 33 #define DA9055_ADC_ADCIN2 2 34 #define DA9055_ADC_ADCIN3 3 35 #define DA9055_ADC_TJUNC 4 36 37 struct da9055_hwmon { 38 struct da9055 *da9055; 39 struct mutex hwmon_lock; 40 struct mutex irq_lock; 41 struct completion done; 42 }; 43 44 static const char * const input_names[] = { 45 [DA9055_ADC_VSYS] = "VSYS", 46 [DA9055_ADC_ADCIN1] = "ADC IN1", 47 [DA9055_ADC_ADCIN2] = "ADC IN2", 48 [DA9055_ADC_ADCIN3] = "ADC IN3", 49 [DA9055_ADC_TJUNC] = "CHIP TEMP", 50 }; 51 52 static const u8 chan_mux[DA9055_ADC_TJUNC + 1] = { 53 [DA9055_ADC_VSYS] = DA9055_ADC_MUX_VSYS, 54 [DA9055_ADC_ADCIN1] = DA9055_ADC_MUX_ADCIN1, 55 [DA9055_ADC_ADCIN2] = DA9055_ADC_MUX_ADCIN2, 56 [DA9055_ADC_ADCIN3] = DA9055_ADC_MUX_ADCIN3, 57 [DA9055_ADC_TJUNC] = DA9055_ADC_MUX_T_SENSE, 58 }; 59 60 static int da9055_adc_manual_read(struct da9055_hwmon *hwmon, 61 unsigned char channel) 62 { 63 int ret; 64 unsigned short calc_data; 65 unsigned short data; 66 unsigned char mux_sel; 67 struct da9055 *da9055 = hwmon->da9055; 68 69 if (channel > DA9055_ADC_TJUNC) 70 return -EINVAL; 71 72 mutex_lock(&hwmon->irq_lock); 73 74 /* Selects desired MUX for manual conversion */ 75 mux_sel = chan_mux[channel] | DA9055_ADC_MAN_CONV; 76 77 ret = da9055_reg_write(da9055, DA9055_REG_ADC_MAN, mux_sel); 78 if (ret < 0) 79 goto err; 80 81 /* Wait for an interrupt */ 82 if (!wait_for_completion_timeout(&hwmon->done, 83 msecs_to_jiffies(500))) { 84 dev_err(da9055->dev, 85 "timeout waiting for ADC conversion interrupt\n"); 86 ret = -ETIMEDOUT; 87 goto err; 88 } 89 90 ret = da9055_reg_read(da9055, DA9055_REG_ADC_RES_H); 91 if (ret < 0) 92 goto err; 93 94 calc_data = (unsigned short)ret; 95 data = calc_data << 2; 96 97 ret = da9055_reg_read(da9055, DA9055_REG_ADC_RES_L); 98 if (ret < 0) 99 goto err; 100 101 calc_data = (unsigned short)(ret & DA9055_ADC_LSB_MASK); 102 data |= calc_data; 103 104 ret = data; 105 106 err: 107 mutex_unlock(&hwmon->irq_lock); 108 return ret; 109 } 110 111 static irqreturn_t da9055_auxadc_irq(int irq, void *irq_data) 112 { 113 struct da9055_hwmon *hwmon = irq_data; 114 115 complete(&hwmon->done); 116 117 return IRQ_HANDLED; 118 } 119 120 /* Conversion function for VSYS and ADCINx */ 121 static inline int volt_reg_to_mv(int value, int channel) 122 { 123 if (channel == DA9055_ADC_VSYS) 124 return DIV_ROUND_CLOSEST(value * 1000, DA9055_VSYS_DIV) + 2500; 125 else 126 return DIV_ROUND_CLOSEST(value * 1000, DA9055_ADCIN_DIV); 127 } 128 129 static int da9055_enable_auto_mode(struct da9055 *da9055, int channel) 130 { 131 132 return da9055_reg_update(da9055, DA9055_REG_ADC_CONT, 1 << channel, 133 1 << channel); 134 135 } 136 137 static int da9055_disable_auto_mode(struct da9055 *da9055, int channel) 138 { 139 140 return da9055_reg_update(da9055, DA9055_REG_ADC_CONT, 1 << channel, 0); 141 } 142 143 static ssize_t da9055_read_auto_ch(struct device *dev, 144 struct device_attribute *devattr, char *buf) 145 { 146 struct da9055_hwmon *hwmon = dev_get_drvdata(dev); 147 int ret, adc; 148 int channel = to_sensor_dev_attr(devattr)->index; 149 150 mutex_lock(&hwmon->hwmon_lock); 151 152 ret = da9055_enable_auto_mode(hwmon->da9055, channel); 153 if (ret < 0) 154 goto hwmon_err; 155 156 usleep_range(10000, 10500); 157 158 adc = da9055_reg_read(hwmon->da9055, DA9055_REG_VSYS_RES + channel); 159 if (adc < 0) { 160 ret = adc; 161 goto hwmon_err_release; 162 } 163 164 ret = da9055_disable_auto_mode(hwmon->da9055, channel); 165 if (ret < 0) 166 goto hwmon_err; 167 168 mutex_unlock(&hwmon->hwmon_lock); 169 170 return sprintf(buf, "%d\n", volt_reg_to_mv(adc, channel)); 171 172 hwmon_err_release: 173 da9055_disable_auto_mode(hwmon->da9055, channel); 174 hwmon_err: 175 mutex_unlock(&hwmon->hwmon_lock); 176 return ret; 177 } 178 179 static ssize_t da9055_read_tjunc(struct device *dev, 180 struct device_attribute *devattr, char *buf) 181 { 182 struct da9055_hwmon *hwmon = dev_get_drvdata(dev); 183 int tjunc; 184 int toffset; 185 186 tjunc = da9055_adc_manual_read(hwmon, DA9055_ADC_TJUNC); 187 if (tjunc < 0) 188 return tjunc; 189 190 toffset = da9055_reg_read(hwmon->da9055, DA9055_REG_T_OFFSET); 191 if (toffset < 0) 192 return toffset; 193 194 /* 195 * Degrees celsius = -0.4084 * (ADC_RES - T_OFFSET) + 307.6332 196 * T_OFFSET is a trim value used to improve accuracy of the result 197 */ 198 return sprintf(buf, "%d\n", DIV_ROUND_CLOSEST(-4084 * (tjunc - toffset) 199 + 3076332, 10000)); 200 } 201 202 static ssize_t show_label(struct device *dev, 203 struct device_attribute *devattr, char *buf) 204 { 205 return sprintf(buf, "%s\n", 206 input_names[to_sensor_dev_attr(devattr)->index]); 207 } 208 209 static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, da9055_read_auto_ch, NULL, 210 DA9055_ADC_VSYS); 211 static SENSOR_DEVICE_ATTR(in0_label, S_IRUGO, show_label, NULL, 212 DA9055_ADC_VSYS); 213 static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, da9055_read_auto_ch, NULL, 214 DA9055_ADC_ADCIN1); 215 static SENSOR_DEVICE_ATTR(in1_label, S_IRUGO, show_label, NULL, 216 DA9055_ADC_ADCIN1); 217 static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, da9055_read_auto_ch, NULL, 218 DA9055_ADC_ADCIN2); 219 static SENSOR_DEVICE_ATTR(in2_label, S_IRUGO, show_label, NULL, 220 DA9055_ADC_ADCIN2); 221 static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, da9055_read_auto_ch, NULL, 222 DA9055_ADC_ADCIN3); 223 static SENSOR_DEVICE_ATTR(in3_label, S_IRUGO, show_label, NULL, 224 DA9055_ADC_ADCIN3); 225 226 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, da9055_read_tjunc, NULL, 227 DA9055_ADC_TJUNC); 228 static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_label, NULL, 229 DA9055_ADC_TJUNC); 230 231 static struct attribute *da9055_attrs[] = { 232 &sensor_dev_attr_in0_input.dev_attr.attr, 233 &sensor_dev_attr_in0_label.dev_attr.attr, 234 &sensor_dev_attr_in1_input.dev_attr.attr, 235 &sensor_dev_attr_in1_label.dev_attr.attr, 236 &sensor_dev_attr_in2_input.dev_attr.attr, 237 &sensor_dev_attr_in2_label.dev_attr.attr, 238 &sensor_dev_attr_in3_input.dev_attr.attr, 239 &sensor_dev_attr_in3_label.dev_attr.attr, 240 241 &sensor_dev_attr_temp1_input.dev_attr.attr, 242 &sensor_dev_attr_temp1_label.dev_attr.attr, 243 NULL 244 }; 245 246 ATTRIBUTE_GROUPS(da9055); 247 248 static int da9055_hwmon_probe(struct platform_device *pdev) 249 { 250 struct device *dev = &pdev->dev; 251 struct da9055_hwmon *hwmon; 252 struct device *hwmon_dev; 253 int hwmon_irq, ret; 254 255 hwmon = devm_kzalloc(dev, sizeof(struct da9055_hwmon), GFP_KERNEL); 256 if (!hwmon) 257 return -ENOMEM; 258 259 mutex_init(&hwmon->hwmon_lock); 260 mutex_init(&hwmon->irq_lock); 261 262 init_completion(&hwmon->done); 263 hwmon->da9055 = dev_get_drvdata(pdev->dev.parent); 264 265 hwmon_irq = platform_get_irq_byname(pdev, "HWMON"); 266 if (hwmon_irq < 0) 267 return hwmon_irq; 268 269 ret = devm_request_threaded_irq(&pdev->dev, hwmon_irq, 270 NULL, da9055_auxadc_irq, 271 IRQF_TRIGGER_HIGH | IRQF_ONESHOT, 272 "adc-irq", hwmon); 273 if (ret != 0) { 274 dev_err(hwmon->da9055->dev, "DA9055 ADC IRQ failed ret=%d\n", 275 ret); 276 return ret; 277 } 278 279 hwmon_dev = devm_hwmon_device_register_with_groups(dev, "da9055", 280 hwmon, 281 da9055_groups); 282 return PTR_ERR_OR_ZERO(hwmon_dev); 283 } 284 285 static struct platform_driver da9055_hwmon_driver = { 286 .probe = da9055_hwmon_probe, 287 .driver = { 288 .name = "da9055-hwmon", 289 }, 290 }; 291 292 module_platform_driver(da9055_hwmon_driver); 293 294 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); 295 MODULE_DESCRIPTION("DA9055 HWMON driver"); 296 MODULE_LICENSE("GPL"); 297 MODULE_ALIAS("platform:da9055-hwmon"); 298