mc13783-adc.c (8968B)
1// SPDX-License-Identifier: GPL-2.0+ 2/* 3 * Driver for the ADC on Freescale Semiconductor MC13783 and MC13892 PMICs. 4 * 5 * Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved. 6 * Copyright (C) 2009 Sascha Hauer, Pengutronix 7 */ 8 9#include <linux/mfd/mc13xxx.h> 10#include <linux/platform_device.h> 11#include <linux/hwmon-sysfs.h> 12#include <linux/kernel.h> 13#include <linux/module.h> 14#include <linux/mod_devicetable.h> 15#include <linux/hwmon.h> 16#include <linux/slab.h> 17#include <linux/init.h> 18#include <linux/err.h> 19 20#define DRIVER_NAME "mc13783-adc" 21 22/* platform device id driver data */ 23#define MC13783_ADC_16CHANS 1 24#define MC13783_ADC_BPDIV2 2 25 26struct mc13783_adc_priv { 27 struct mc13xxx *mc13xxx; 28 struct device *hwmon_dev; 29 char name[PLATFORM_NAME_SIZE]; 30}; 31 32static ssize_t name_show(struct device *dev, struct device_attribute *devattr, 33 char *buf) 34{ 35 struct mc13783_adc_priv *priv = dev_get_drvdata(dev); 36 37 return sprintf(buf, "%s\n", priv->name); 38} 39 40static int mc13783_adc_read(struct device *dev, 41 struct device_attribute *devattr, unsigned int *val) 42{ 43 struct mc13783_adc_priv *priv = dev_get_drvdata(dev); 44 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 45 unsigned int channel = attr->index; 46 unsigned int sample[4]; 47 int ret; 48 49 ret = mc13xxx_adc_do_conversion(priv->mc13xxx, 50 MC13XXX_ADC_MODE_MULT_CHAN, 51 channel, 0, 0, sample); 52 if (ret) 53 return ret; 54 55 /* ADIN7 subchannels */ 56 if (channel >= 16) 57 channel = 7; 58 59 channel &= 0x7; 60 61 *val = (sample[channel % 4] >> (channel > 3 ? 14 : 2)) & 0x3ff; 62 63 return 0; 64} 65 66static ssize_t mc13783_adc_bp_show(struct device *dev, 67 struct device_attribute *devattr, 68 char *buf) 69{ 70 unsigned val; 71 struct platform_device *pdev = to_platform_device(dev); 72 kernel_ulong_t driver_data = platform_get_device_id(pdev)->driver_data; 73 int ret = mc13783_adc_read(dev, devattr, &val); 74 75 if (ret) 76 return ret; 77 78 if (driver_data & MC13783_ADC_BPDIV2) 79 val = DIV_ROUND_CLOSEST(val * 9, 2); 80 else 81 /* 82 * BP (channel 2) reports with offset 2.4V to the actual value 83 * to fit the input range of the ADC. unit = 2.25mV = 9/4 mV. 84 */ 85 val = DIV_ROUND_CLOSEST(val * 9, 4) + 2400; 86 87 return sprintf(buf, "%u\n", val); 88} 89 90static ssize_t mc13783_adc_gp_show(struct device *dev, 91 struct device_attribute *devattr, 92 char *buf) 93{ 94 unsigned val; 95 int ret = mc13783_adc_read(dev, devattr, &val); 96 97 if (ret) 98 return ret; 99 100 /* 101 * input range is [0, 2.3V], val has 10 bits, so each bit 102 * is worth 9/4 mV. 103 */ 104 val = DIV_ROUND_CLOSEST(val * 9, 4); 105 106 return sprintf(buf, "%u\n", val); 107} 108 109static ssize_t mc13783_adc_uid_show(struct device *dev, 110 struct device_attribute *devattr, 111 char *buf) 112{ 113 unsigned int val; 114 struct platform_device *pdev = to_platform_device(dev); 115 kernel_ulong_t driver_data = platform_get_device_id(pdev)->driver_data; 116 int ret = mc13783_adc_read(dev, devattr, &val); 117 118 if (ret) 119 return ret; 120 121 if (driver_data & MC13783_ADC_BPDIV2) 122 /* MC13892 have 1/2 divider, input range is [0, 4.800V] */ 123 val = DIV_ROUND_CLOSEST(val * 4800, 1024); 124 else 125 /* MC13783 have 0.9 divider, input range is [0, 2.555V] */ 126 val = DIV_ROUND_CLOSEST(val * 2555, 1024); 127 128 return sprintf(buf, "%u\n", val); 129} 130 131static ssize_t mc13783_adc_temp_show(struct device *dev, 132 struct device_attribute *devattr, 133 char *buf) 134{ 135 unsigned int val; 136 struct platform_device *pdev = to_platform_device(dev); 137 kernel_ulong_t driver_data = platform_get_device_id(pdev)->driver_data; 138 int ret = mc13783_adc_read(dev, devattr, &val); 139 140 if (ret) 141 return ret; 142 143 if (driver_data & MC13783_ADC_BPDIV2) { 144 /* 145 * MC13892: 146 * Die Temperature Read Out Code at 25C 680 147 * Temperature change per LSB +0.4244C 148 */ 149 ret = DIV_ROUND_CLOSEST(-2635920 + val * 4244, 10); 150 } else { 151 /* 152 * MC13783: 153 * Die Temperature Read Out Code at 25C 282 154 * Temperature change per LSB -1.14C 155 */ 156 ret = 346480 - 1140 * val; 157 } 158 159 return sprintf(buf, "%d\n", ret); 160} 161 162static DEVICE_ATTR_RO(name); 163static SENSOR_DEVICE_ATTR_RO(in2_input, mc13783_adc_bp, 2); 164static SENSOR_DEVICE_ATTR_RO(in5_input, mc13783_adc_gp, 5); 165static SENSOR_DEVICE_ATTR_RO(in6_input, mc13783_adc_gp, 6); 166static SENSOR_DEVICE_ATTR_RO(in7_input, mc13783_adc_gp, 7); 167static SENSOR_DEVICE_ATTR_RO(in8_input, mc13783_adc_gp, 8); 168static SENSOR_DEVICE_ATTR_RO(in9_input, mc13783_adc_gp, 9); 169static SENSOR_DEVICE_ATTR_RO(in10_input, mc13783_adc_gp, 10); 170static SENSOR_DEVICE_ATTR_RO(in11_input, mc13783_adc_gp, 11); 171static SENSOR_DEVICE_ATTR_RO(in12_input, mc13783_adc_gp, 12); 172static SENSOR_DEVICE_ATTR_RO(in13_input, mc13783_adc_gp, 13); 173static SENSOR_DEVICE_ATTR_RO(in14_input, mc13783_adc_gp, 14); 174static SENSOR_DEVICE_ATTR_RO(in15_input, mc13783_adc_gp, 15); 175static SENSOR_DEVICE_ATTR_RO(in16_input, mc13783_adc_uid, 16); 176static SENSOR_DEVICE_ATTR_RO(temp1_input, mc13783_adc_temp, 17); 177 178static struct attribute *mc13783_attr_base[] = { 179 &dev_attr_name.attr, 180 &sensor_dev_attr_in2_input.dev_attr.attr, 181 &sensor_dev_attr_in5_input.dev_attr.attr, 182 &sensor_dev_attr_in6_input.dev_attr.attr, 183 &sensor_dev_attr_in7_input.dev_attr.attr, 184 &sensor_dev_attr_in16_input.dev_attr.attr, 185 &sensor_dev_attr_temp1_input.dev_attr.attr, 186 NULL 187}; 188 189static const struct attribute_group mc13783_group_base = { 190 .attrs = mc13783_attr_base, 191}; 192 193/* these are only used if MC13783_ADC_16CHANS is provided in driver data */ 194static struct attribute *mc13783_attr_16chans[] = { 195 &sensor_dev_attr_in8_input.dev_attr.attr, 196 &sensor_dev_attr_in9_input.dev_attr.attr, 197 &sensor_dev_attr_in10_input.dev_attr.attr, 198 &sensor_dev_attr_in11_input.dev_attr.attr, 199 NULL 200}; 201 202static const struct attribute_group mc13783_group_16chans = { 203 .attrs = mc13783_attr_16chans, 204}; 205 206/* last four channels may be occupied by the touchscreen */ 207static struct attribute *mc13783_attr_ts[] = { 208 &sensor_dev_attr_in12_input.dev_attr.attr, 209 &sensor_dev_attr_in13_input.dev_attr.attr, 210 &sensor_dev_attr_in14_input.dev_attr.attr, 211 &sensor_dev_attr_in15_input.dev_attr.attr, 212 NULL 213}; 214 215static const struct attribute_group mc13783_group_ts = { 216 .attrs = mc13783_attr_ts, 217}; 218 219static int mc13783_adc_use_touchscreen(struct platform_device *pdev) 220{ 221 struct mc13783_adc_priv *priv = platform_get_drvdata(pdev); 222 unsigned flags = mc13xxx_get_flags(priv->mc13xxx); 223 224 return flags & MC13XXX_USE_TOUCHSCREEN; 225} 226 227static int __init mc13783_adc_probe(struct platform_device *pdev) 228{ 229 struct mc13783_adc_priv *priv; 230 int ret; 231 const struct platform_device_id *id = platform_get_device_id(pdev); 232 char *dash; 233 234 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); 235 if (!priv) 236 return -ENOMEM; 237 238 priv->mc13xxx = dev_get_drvdata(pdev->dev.parent); 239 snprintf(priv->name, ARRAY_SIZE(priv->name), "%s", id->name); 240 dash = strchr(priv->name, '-'); 241 if (dash) 242 *dash = '\0'; 243 244 platform_set_drvdata(pdev, priv); 245 246 /* Register sysfs hooks */ 247 ret = sysfs_create_group(&pdev->dev.kobj, &mc13783_group_base); 248 if (ret) 249 return ret; 250 251 if (id->driver_data & MC13783_ADC_16CHANS) { 252 ret = sysfs_create_group(&pdev->dev.kobj, 253 &mc13783_group_16chans); 254 if (ret) 255 goto out_err_create_16chans; 256 } 257 258 if (!mc13783_adc_use_touchscreen(pdev)) { 259 ret = sysfs_create_group(&pdev->dev.kobj, &mc13783_group_ts); 260 if (ret) 261 goto out_err_create_ts; 262 } 263 264 priv->hwmon_dev = hwmon_device_register(&pdev->dev); 265 if (IS_ERR(priv->hwmon_dev)) { 266 ret = PTR_ERR(priv->hwmon_dev); 267 dev_err(&pdev->dev, 268 "hwmon_device_register failed with %d.\n", ret); 269 goto out_err_register; 270 } 271 272 return 0; 273 274out_err_register: 275 276 if (!mc13783_adc_use_touchscreen(pdev)) 277 sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_ts); 278out_err_create_ts: 279 280 if (id->driver_data & MC13783_ADC_16CHANS) 281 sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_16chans); 282out_err_create_16chans: 283 284 sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_base); 285 return ret; 286} 287 288static int mc13783_adc_remove(struct platform_device *pdev) 289{ 290 struct mc13783_adc_priv *priv = platform_get_drvdata(pdev); 291 kernel_ulong_t driver_data = platform_get_device_id(pdev)->driver_data; 292 293 hwmon_device_unregister(priv->hwmon_dev); 294 295 if (!mc13783_adc_use_touchscreen(pdev)) 296 sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_ts); 297 298 if (driver_data & MC13783_ADC_16CHANS) 299 sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_16chans); 300 301 sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_base); 302 303 return 0; 304} 305 306static const struct platform_device_id mc13783_adc_idtable[] = { 307 { 308 .name = "mc13783-adc", 309 .driver_data = MC13783_ADC_16CHANS, 310 }, { 311 .name = "mc13892-adc", 312 .driver_data = MC13783_ADC_BPDIV2, 313 }, { 314 /* sentinel */ 315 } 316}; 317MODULE_DEVICE_TABLE(platform, mc13783_adc_idtable); 318 319static struct platform_driver mc13783_adc_driver = { 320 .remove = mc13783_adc_remove, 321 .driver = { 322 .name = DRIVER_NAME, 323 }, 324 .id_table = mc13783_adc_idtable, 325}; 326 327module_platform_driver_probe(mc13783_adc_driver, mc13783_adc_probe); 328 329MODULE_DESCRIPTION("MC13783 ADC driver"); 330MODULE_AUTHOR("Luotao Fu <l.fu@pengutronix.de>"); 331MODULE_LICENSE("GPL");