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