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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, Pengutronix7 */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 124#define MC13783_ADC_BPDIV2 225 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 else81 /*82 * BP (channel 2) reports with offset 2.4V to the actual value83 * 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 bit102 * 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 else125 /* 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 680147 * Temperature change per LSB +0.4244C148 */149 ret = DIV_ROUND_CLOSEST(-2635920 + val * 4244, 10);150 } else {151 /*152 * MC13783:153 * Die Temperature Read Out Code at 25C 282154 * Temperature change per LSB -1.14C155 */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 NULL187};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 NULL200};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 NULL213};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 void 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 304static const struct platform_device_id mc13783_adc_idtable[] = {305 {306 .name = "mc13783-adc",307 .driver_data = MC13783_ADC_16CHANS,308 }, {309 .name = "mc13892-adc",310 .driver_data = MC13783_ADC_BPDIV2,311 }, {312 /* sentinel */313 }314};315MODULE_DEVICE_TABLE(platform, mc13783_adc_idtable);316 317static struct platform_driver mc13783_adc_driver = {318 .remove_new = mc13783_adc_remove,319 .driver = {320 .name = DRIVER_NAME,321 },322 .id_table = mc13783_adc_idtable,323};324 325module_platform_driver_probe(mc13783_adc_driver, mc13783_adc_probe);326 327MODULE_DESCRIPTION("MC13783 ADC driver");328MODULE_AUTHOR("Luotao Fu <l.fu@pengutronix.de>");329MODULE_LICENSE("GPL");330