1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * HWMON Driver for Dialog DA9055 4 * 5 * Copyright(c) 2012 Dialog Semiconductor Ltd. 6 * 7 * Author: David Dajun Chen <dchen@diasemi.com> 8 */ 9 10 #include <linux/delay.h> 11 #include <linux/err.h> 12 #include <linux/hwmon.h> 13 #include <linux/hwmon-sysfs.h> 14 #include <linux/init.h> 15 #include <linux/kernel.h> 16 #include <linux/module.h> 17 #include <linux/platform_device.h> 18 #include <linux/completion.h> 19 20 #include <linux/mfd/da9055/core.h> 21 #include <linux/mfd/da9055/reg.h> 22 23 #define DA9055_ADCIN_DIV 102 24 #define DA9055_VSYS_DIV 85 25 26 #define DA9055_ADC_VSYS 0 27 #define DA9055_ADC_ADCIN1 1 28 #define DA9055_ADC_ADCIN2 2 29 #define DA9055_ADC_ADCIN3 3 30 #define DA9055_ADC_TJUNC 4 31 32 struct da9055_hwmon { 33 struct da9055 *da9055; 34 struct mutex hwmon_lock; 35 struct mutex irq_lock; 36 struct completion done; 37 }; 38 39 static const char * const input_names[] = { 40 [DA9055_ADC_VSYS] = "VSYS", 41 [DA9055_ADC_ADCIN1] = "ADC IN1", 42 [DA9055_ADC_ADCIN2] = "ADC IN2", 43 [DA9055_ADC_ADCIN3] = "ADC IN3", 44 [DA9055_ADC_TJUNC] = "CHIP TEMP", 45 }; 46 47 static const u8 chan_mux[DA9055_ADC_TJUNC + 1] = { 48 [DA9055_ADC_VSYS] = DA9055_ADC_MUX_VSYS, 49 [DA9055_ADC_ADCIN1] = DA9055_ADC_MUX_ADCIN1, 50 [DA9055_ADC_ADCIN2] = DA9055_ADC_MUX_ADCIN2, 51 [DA9055_ADC_ADCIN3] = DA9055_ADC_MUX_ADCIN3, 52 [DA9055_ADC_TJUNC] = DA9055_ADC_MUX_T_SENSE, 53 }; 54 55 static int da9055_adc_manual_read(struct da9055_hwmon *hwmon, 56 unsigned char channel) 57 { 58 int ret; 59 unsigned short calc_data; 60 unsigned short data; 61 unsigned char mux_sel; 62 struct da9055 *da9055 = hwmon->da9055; 63 64 if (channel > DA9055_ADC_TJUNC) 65 return -EINVAL; 66 67 mutex_lock(&hwmon->irq_lock); 68 69 /* Selects desired MUX for manual conversion */ 70 mux_sel = chan_mux[channel] | DA9055_ADC_MAN_CONV; 71 72 ret = da9055_reg_write(da9055, DA9055_REG_ADC_MAN, mux_sel); 73 if (ret < 0) 74 goto err; 75 76 /* Wait for an interrupt */ 77 if (!wait_for_completion_timeout(&hwmon->done, 78 msecs_to_jiffies(500))) { 79 dev_err(da9055->dev, 80 "timeout waiting for ADC conversion interrupt\n"); 81 ret = -ETIMEDOUT; 82 goto err; 83 } 84 85 ret = da9055_reg_read(da9055, DA9055_REG_ADC_RES_H); 86 if (ret < 0) 87 goto err; 88 89 calc_data = (unsigned short)ret; 90 data = calc_data << 2; 91 92 ret = da9055_reg_read(da9055, DA9055_REG_ADC_RES_L); 93 if (ret < 0) 94 goto err; 95 96 calc_data = (unsigned short)(ret & DA9055_ADC_LSB_MASK); 97 data |= calc_data; 98 99 ret = data; 100 101 err: 102 mutex_unlock(&hwmon->irq_lock); 103 return ret; 104 } 105 106 static irqreturn_t da9055_auxadc_irq(int irq, void *irq_data) 107 { 108 struct da9055_hwmon *hwmon = irq_data; 109 110 complete(&hwmon->done); 111 112 return IRQ_HANDLED; 113 } 114 115 /* Conversion function for VSYS and ADCINx */ 116 static inline int volt_reg_to_mv(int value, int channel) 117 { 118 if (channel == DA9055_ADC_VSYS) 119 return DIV_ROUND_CLOSEST(value * 1000, DA9055_VSYS_DIV) + 2500; 120 else 121 return DIV_ROUND_CLOSEST(value * 1000, DA9055_ADCIN_DIV); 122 } 123 124 static int da9055_enable_auto_mode(struct da9055 *da9055, int channel) 125 { 126 127 return da9055_reg_update(da9055, DA9055_REG_ADC_CONT, 1 << channel, 128 1 << channel); 129 130 } 131 132 static int da9055_disable_auto_mode(struct da9055 *da9055, int channel) 133 { 134 135 return da9055_reg_update(da9055, DA9055_REG_ADC_CONT, 1 << channel, 0); 136 } 137 138 static ssize_t da9055_auto_ch_show(struct device *dev, 139 struct device_attribute *devattr, 140 char *buf) 141 { 142 struct da9055_hwmon *hwmon = dev_get_drvdata(dev); 143 int ret, adc; 144 int channel = to_sensor_dev_attr(devattr)->index; 145 146 mutex_lock(&hwmon->hwmon_lock); 147 148 ret = da9055_enable_auto_mode(hwmon->da9055, channel); 149 if (ret < 0) 150 goto hwmon_err; 151 152 usleep_range(10000, 10500); 153 154 adc = da9055_reg_read(hwmon->da9055, DA9055_REG_VSYS_RES + channel); 155 if (adc < 0) { 156 ret = adc; 157 goto hwmon_err_release; 158 } 159 160 ret = da9055_disable_auto_mode(hwmon->da9055, channel); 161 if (ret < 0) 162 goto hwmon_err; 163 164 mutex_unlock(&hwmon->hwmon_lock); 165 166 return sprintf(buf, "%d\n", volt_reg_to_mv(adc, channel)); 167 168 hwmon_err_release: 169 da9055_disable_auto_mode(hwmon->da9055, channel); 170 hwmon_err: 171 mutex_unlock(&hwmon->hwmon_lock); 172 return ret; 173 } 174 175 static ssize_t da9055_tjunc_show(struct device *dev, 176 struct device_attribute *devattr, char *buf) 177 { 178 struct da9055_hwmon *hwmon = dev_get_drvdata(dev); 179 int tjunc; 180 int toffset; 181 182 tjunc = da9055_adc_manual_read(hwmon, DA9055_ADC_TJUNC); 183 if (tjunc < 0) 184 return tjunc; 185 186 toffset = da9055_reg_read(hwmon->da9055, DA9055_REG_T_OFFSET); 187 if (toffset < 0) 188 return toffset; 189 190 /* 191 * Degrees celsius = -0.4084 * (ADC_RES - T_OFFSET) + 307.6332 192 * T_OFFSET is a trim value used to improve accuracy of the result 193 */ 194 return sprintf(buf, "%d\n", DIV_ROUND_CLOSEST(-4084 * (tjunc - toffset) 195 + 3076332, 10000)); 196 } 197 198 static ssize_t label_show(struct device *dev, 199 struct device_attribute *devattr, char *buf) 200 { 201 return sprintf(buf, "%s\n", 202 input_names[to_sensor_dev_attr(devattr)->index]); 203 } 204 205 static SENSOR_DEVICE_ATTR_RO(in0_input, da9055_auto_ch, DA9055_ADC_VSYS); 206 static SENSOR_DEVICE_ATTR_RO(in0_label, label, DA9055_ADC_VSYS); 207 static SENSOR_DEVICE_ATTR_RO(in1_input, da9055_auto_ch, DA9055_ADC_ADCIN1); 208 static SENSOR_DEVICE_ATTR_RO(in1_label, label, DA9055_ADC_ADCIN1); 209 static SENSOR_DEVICE_ATTR_RO(in2_input, da9055_auto_ch, DA9055_ADC_ADCIN2); 210 static SENSOR_DEVICE_ATTR_RO(in2_label, label, DA9055_ADC_ADCIN2); 211 static SENSOR_DEVICE_ATTR_RO(in3_input, da9055_auto_ch, DA9055_ADC_ADCIN3); 212 static SENSOR_DEVICE_ATTR_RO(in3_label, label, DA9055_ADC_ADCIN3); 213 214 static SENSOR_DEVICE_ATTR_RO(temp1_input, da9055_tjunc, DA9055_ADC_TJUNC); 215 static SENSOR_DEVICE_ATTR_RO(temp1_label, label, DA9055_ADC_TJUNC); 216 217 static struct attribute *da9055_attrs[] = { 218 &sensor_dev_attr_in0_input.dev_attr.attr, 219 &sensor_dev_attr_in0_label.dev_attr.attr, 220 &sensor_dev_attr_in1_input.dev_attr.attr, 221 &sensor_dev_attr_in1_label.dev_attr.attr, 222 &sensor_dev_attr_in2_input.dev_attr.attr, 223 &sensor_dev_attr_in2_label.dev_attr.attr, 224 &sensor_dev_attr_in3_input.dev_attr.attr, 225 &sensor_dev_attr_in3_label.dev_attr.attr, 226 227 &sensor_dev_attr_temp1_input.dev_attr.attr, 228 &sensor_dev_attr_temp1_label.dev_attr.attr, 229 NULL 230 }; 231 232 ATTRIBUTE_GROUPS(da9055); 233 234 static int da9055_hwmon_probe(struct platform_device *pdev) 235 { 236 struct device *dev = &pdev->dev; 237 struct da9055_hwmon *hwmon; 238 struct device *hwmon_dev; 239 int hwmon_irq, ret; 240 241 hwmon = devm_kzalloc(dev, sizeof(struct da9055_hwmon), GFP_KERNEL); 242 if (!hwmon) 243 return -ENOMEM; 244 245 mutex_init(&hwmon->hwmon_lock); 246 mutex_init(&hwmon->irq_lock); 247 248 init_completion(&hwmon->done); 249 hwmon->da9055 = dev_get_drvdata(pdev->dev.parent); 250 251 hwmon_irq = platform_get_irq_byname(pdev, "HWMON"); 252 if (hwmon_irq < 0) 253 return hwmon_irq; 254 255 ret = devm_request_threaded_irq(&pdev->dev, hwmon_irq, 256 NULL, da9055_auxadc_irq, 257 IRQF_TRIGGER_HIGH | IRQF_ONESHOT, 258 "adc-irq", hwmon); 259 if (ret != 0) { 260 dev_err(hwmon->da9055->dev, "DA9055 ADC IRQ failed ret=%d\n", 261 ret); 262 return ret; 263 } 264 265 hwmon_dev = devm_hwmon_device_register_with_groups(dev, "da9055", 266 hwmon, 267 da9055_groups); 268 return PTR_ERR_OR_ZERO(hwmon_dev); 269 } 270 271 static struct platform_driver da9055_hwmon_driver = { 272 .probe = da9055_hwmon_probe, 273 .driver = { 274 .name = "da9055-hwmon", 275 }, 276 }; 277 278 module_platform_driver(da9055_hwmon_driver); 279 280 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); 281 MODULE_DESCRIPTION("DA9055 HWMON driver"); 282 MODULE_LICENSE("GPL"); 283 MODULE_ALIAS("platform:da9055-hwmon"); 284