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331 lines
8.8 KiB
331 lines
8.8 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* Driver for the ADC on Freescale Semiconductor MC13783 and MC13892 PMICs. |
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* |
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* Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved. |
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* Copyright (C) 2009 Sascha Hauer, Pengutronix |
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*/ |
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#include <linux/mfd/mc13xxx.h> |
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#include <linux/platform_device.h> |
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#include <linux/hwmon-sysfs.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/mod_devicetable.h> |
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#include <linux/hwmon.h> |
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#include <linux/slab.h> |
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#include <linux/init.h> |
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#include <linux/err.h> |
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#define DRIVER_NAME "mc13783-adc" |
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/* platform device id driver data */ |
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#define MC13783_ADC_16CHANS 1 |
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#define MC13783_ADC_BPDIV2 2 |
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struct mc13783_adc_priv { |
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struct mc13xxx *mc13xxx; |
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struct device *hwmon_dev; |
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char name[PLATFORM_NAME_SIZE]; |
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}; |
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static ssize_t name_show(struct device *dev, struct device_attribute *devattr, |
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char *buf) |
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{ |
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struct mc13783_adc_priv *priv = dev_get_drvdata(dev); |
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return sprintf(buf, "%s\n", priv->name); |
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} |
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static int mc13783_adc_read(struct device *dev, |
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struct device_attribute *devattr, unsigned int *val) |
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{ |
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struct mc13783_adc_priv *priv = dev_get_drvdata(dev); |
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
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unsigned int channel = attr->index; |
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unsigned int sample[4]; |
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int ret; |
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ret = mc13xxx_adc_do_conversion(priv->mc13xxx, |
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MC13XXX_ADC_MODE_MULT_CHAN, |
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channel, 0, 0, sample); |
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if (ret) |
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return ret; |
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/* ADIN7 subchannels */ |
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if (channel >= 16) |
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channel = 7; |
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channel &= 0x7; |
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*val = (sample[channel % 4] >> (channel > 3 ? 14 : 2)) & 0x3ff; |
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return 0; |
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} |
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static ssize_t mc13783_adc_bp_show(struct device *dev, |
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struct device_attribute *devattr, |
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char *buf) |
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{ |
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unsigned val; |
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struct platform_device *pdev = to_platform_device(dev); |
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kernel_ulong_t driver_data = platform_get_device_id(pdev)->driver_data; |
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int ret = mc13783_adc_read(dev, devattr, &val); |
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if (ret) |
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return ret; |
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if (driver_data & MC13783_ADC_BPDIV2) |
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val = DIV_ROUND_CLOSEST(val * 9, 2); |
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else |
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/* |
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* BP (channel 2) reports with offset 2.4V to the actual value |
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* to fit the input range of the ADC. unit = 2.25mV = 9/4 mV. |
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*/ |
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val = DIV_ROUND_CLOSEST(val * 9, 4) + 2400; |
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return sprintf(buf, "%u\n", val); |
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} |
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static ssize_t mc13783_adc_gp_show(struct device *dev, |
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struct device_attribute *devattr, |
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char *buf) |
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{ |
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unsigned val; |
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int ret = mc13783_adc_read(dev, devattr, &val); |
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if (ret) |
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return ret; |
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/* |
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* input range is [0, 2.3V], val has 10 bits, so each bit |
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* is worth 9/4 mV. |
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*/ |
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val = DIV_ROUND_CLOSEST(val * 9, 4); |
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return sprintf(buf, "%u\n", val); |
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} |
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static ssize_t mc13783_adc_uid_show(struct device *dev, |
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struct device_attribute *devattr, |
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char *buf) |
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{ |
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unsigned int val; |
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struct platform_device *pdev = to_platform_device(dev); |
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kernel_ulong_t driver_data = platform_get_device_id(pdev)->driver_data; |
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int ret = mc13783_adc_read(dev, devattr, &val); |
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if (ret) |
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return ret; |
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if (driver_data & MC13783_ADC_BPDIV2) |
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/* MC13892 have 1/2 divider, input range is [0, 4.800V] */ |
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val = DIV_ROUND_CLOSEST(val * 4800, 1024); |
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else |
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/* MC13783 have 0.9 divider, input range is [0, 2.555V] */ |
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val = DIV_ROUND_CLOSEST(val * 2555, 1024); |
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return sprintf(buf, "%u\n", val); |
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} |
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static ssize_t mc13783_adc_temp_show(struct device *dev, |
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struct device_attribute *devattr, |
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char *buf) |
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{ |
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unsigned int val; |
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struct platform_device *pdev = to_platform_device(dev); |
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kernel_ulong_t driver_data = platform_get_device_id(pdev)->driver_data; |
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int ret = mc13783_adc_read(dev, devattr, &val); |
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if (ret) |
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return ret; |
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if (driver_data & MC13783_ADC_BPDIV2) { |
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/* |
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* MC13892: |
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* Die Temperature Read Out Code at 25C 680 |
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* Temperature change per LSB +0.4244C |
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*/ |
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ret = DIV_ROUND_CLOSEST(-2635920 + val * 4244, 10); |
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} else { |
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/* |
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* MC13783: |
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* Die Temperature Read Out Code at 25C 282 |
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* Temperature change per LSB -1.14C |
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*/ |
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ret = 346480 - 1140 * val; |
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} |
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return sprintf(buf, "%d\n", ret); |
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} |
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static DEVICE_ATTR_RO(name); |
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static SENSOR_DEVICE_ATTR_RO(in2_input, mc13783_adc_bp, 2); |
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static SENSOR_DEVICE_ATTR_RO(in5_input, mc13783_adc_gp, 5); |
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static SENSOR_DEVICE_ATTR_RO(in6_input, mc13783_adc_gp, 6); |
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static SENSOR_DEVICE_ATTR_RO(in7_input, mc13783_adc_gp, 7); |
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static SENSOR_DEVICE_ATTR_RO(in8_input, mc13783_adc_gp, 8); |
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static SENSOR_DEVICE_ATTR_RO(in9_input, mc13783_adc_gp, 9); |
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static SENSOR_DEVICE_ATTR_RO(in10_input, mc13783_adc_gp, 10); |
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static SENSOR_DEVICE_ATTR_RO(in11_input, mc13783_adc_gp, 11); |
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static SENSOR_DEVICE_ATTR_RO(in12_input, mc13783_adc_gp, 12); |
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static SENSOR_DEVICE_ATTR_RO(in13_input, mc13783_adc_gp, 13); |
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static SENSOR_DEVICE_ATTR_RO(in14_input, mc13783_adc_gp, 14); |
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static SENSOR_DEVICE_ATTR_RO(in15_input, mc13783_adc_gp, 15); |
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static SENSOR_DEVICE_ATTR_RO(in16_input, mc13783_adc_uid, 16); |
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static SENSOR_DEVICE_ATTR_RO(temp1_input, mc13783_adc_temp, 17); |
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static struct attribute *mc13783_attr_base[] = { |
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&dev_attr_name.attr, |
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&sensor_dev_attr_in2_input.dev_attr.attr, |
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&sensor_dev_attr_in5_input.dev_attr.attr, |
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&sensor_dev_attr_in6_input.dev_attr.attr, |
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&sensor_dev_attr_in7_input.dev_attr.attr, |
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&sensor_dev_attr_in16_input.dev_attr.attr, |
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&sensor_dev_attr_temp1_input.dev_attr.attr, |
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NULL |
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}; |
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static const struct attribute_group mc13783_group_base = { |
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.attrs = mc13783_attr_base, |
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}; |
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/* these are only used if MC13783_ADC_16CHANS is provided in driver data */ |
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static struct attribute *mc13783_attr_16chans[] = { |
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&sensor_dev_attr_in8_input.dev_attr.attr, |
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&sensor_dev_attr_in9_input.dev_attr.attr, |
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&sensor_dev_attr_in10_input.dev_attr.attr, |
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&sensor_dev_attr_in11_input.dev_attr.attr, |
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NULL |
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}; |
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static const struct attribute_group mc13783_group_16chans = { |
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.attrs = mc13783_attr_16chans, |
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}; |
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/* last four channels may be occupied by the touchscreen */ |
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static struct attribute *mc13783_attr_ts[] = { |
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&sensor_dev_attr_in12_input.dev_attr.attr, |
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&sensor_dev_attr_in13_input.dev_attr.attr, |
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&sensor_dev_attr_in14_input.dev_attr.attr, |
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&sensor_dev_attr_in15_input.dev_attr.attr, |
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NULL |
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}; |
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static const struct attribute_group mc13783_group_ts = { |
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.attrs = mc13783_attr_ts, |
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}; |
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static int mc13783_adc_use_touchscreen(struct platform_device *pdev) |
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{ |
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struct mc13783_adc_priv *priv = platform_get_drvdata(pdev); |
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unsigned flags = mc13xxx_get_flags(priv->mc13xxx); |
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return flags & MC13XXX_USE_TOUCHSCREEN; |
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} |
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static int __init mc13783_adc_probe(struct platform_device *pdev) |
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{ |
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struct mc13783_adc_priv *priv; |
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int ret; |
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const struct platform_device_id *id = platform_get_device_id(pdev); |
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char *dash; |
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priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); |
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if (!priv) |
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return -ENOMEM; |
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priv->mc13xxx = dev_get_drvdata(pdev->dev.parent); |
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snprintf(priv->name, ARRAY_SIZE(priv->name), "%s", id->name); |
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dash = strchr(priv->name, '-'); |
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if (dash) |
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*dash = '\0'; |
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platform_set_drvdata(pdev, priv); |
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/* Register sysfs hooks */ |
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ret = sysfs_create_group(&pdev->dev.kobj, &mc13783_group_base); |
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if (ret) |
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return ret; |
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if (id->driver_data & MC13783_ADC_16CHANS) { |
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ret = sysfs_create_group(&pdev->dev.kobj, |
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&mc13783_group_16chans); |
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if (ret) |
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goto out_err_create_16chans; |
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} |
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if (!mc13783_adc_use_touchscreen(pdev)) { |
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ret = sysfs_create_group(&pdev->dev.kobj, &mc13783_group_ts); |
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if (ret) |
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goto out_err_create_ts; |
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} |
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priv->hwmon_dev = hwmon_device_register(&pdev->dev); |
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if (IS_ERR(priv->hwmon_dev)) { |
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ret = PTR_ERR(priv->hwmon_dev); |
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dev_err(&pdev->dev, |
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"hwmon_device_register failed with %d.\n", ret); |
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goto out_err_register; |
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} |
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return 0; |
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out_err_register: |
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if (!mc13783_adc_use_touchscreen(pdev)) |
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sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_ts); |
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out_err_create_ts: |
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if (id->driver_data & MC13783_ADC_16CHANS) |
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sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_16chans); |
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out_err_create_16chans: |
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sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_base); |
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return ret; |
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} |
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static int mc13783_adc_remove(struct platform_device *pdev) |
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{ |
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struct mc13783_adc_priv *priv = platform_get_drvdata(pdev); |
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kernel_ulong_t driver_data = platform_get_device_id(pdev)->driver_data; |
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hwmon_device_unregister(priv->hwmon_dev); |
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if (!mc13783_adc_use_touchscreen(pdev)) |
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sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_ts); |
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if (driver_data & MC13783_ADC_16CHANS) |
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sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_16chans); |
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sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_base); |
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return 0; |
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} |
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static const struct platform_device_id mc13783_adc_idtable[] = { |
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{ |
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.name = "mc13783-adc", |
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.driver_data = MC13783_ADC_16CHANS, |
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}, { |
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.name = "mc13892-adc", |
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.driver_data = MC13783_ADC_BPDIV2, |
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}, { |
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/* sentinel */ |
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} |
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}; |
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MODULE_DEVICE_TABLE(platform, mc13783_adc_idtable); |
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static struct platform_driver mc13783_adc_driver = { |
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.remove = mc13783_adc_remove, |
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.driver = { |
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.name = DRIVER_NAME, |
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}, |
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.id_table = mc13783_adc_idtable, |
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}; |
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module_platform_driver_probe(mc13783_adc_driver, mc13783_adc_probe); |
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MODULE_DESCRIPTION("MC13783 ADC driver"); |
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MODULE_AUTHOR("Luotao Fu <[email protected]>"); |
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MODULE_LICENSE("GPL");
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