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379 lines
9.8 KiB
379 lines
9.8 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* linux/drivers/hwmon/s3c-hwmon.c |
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* |
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* Copyright (C) 2005, 2008, 2009 Simtec Electronics |
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* http://armlinux.simtec.co.uk/ |
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* Ben Dooks <[email protected]> |
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* |
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* S3C24XX/S3C64XX ADC hwmon support |
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*/ |
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#include <linux/module.h> |
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#include <linux/slab.h> |
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#include <linux/io.h> |
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#include <linux/init.h> |
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#include <linux/err.h> |
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#include <linux/clk.h> |
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#include <linux/interrupt.h> |
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#include <linux/platform_device.h> |
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#include <linux/hwmon.h> |
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#include <linux/hwmon-sysfs.h> |
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#include <linux/soc/samsung/s3c-adc.h> |
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#include <linux/platform_data/hwmon-s3c.h> |
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struct s3c_hwmon_attr { |
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struct sensor_device_attribute in; |
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struct sensor_device_attribute label; |
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char in_name[12]; |
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char label_name[12]; |
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}; |
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/** |
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* struct s3c_hwmon - ADC hwmon client information |
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* @lock: Access lock to serialise the conversions. |
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* @client: The client we registered with the S3C ADC core. |
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* @hwmon_dev: The hwmon device we created. |
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* @attr: The holders for the channel attributes. |
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*/ |
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struct s3c_hwmon { |
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struct mutex lock; |
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struct s3c_adc_client *client; |
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struct device *hwmon_dev; |
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struct s3c_hwmon_attr attrs[8]; |
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}; |
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/** |
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* s3c_hwmon_read_ch - read a value from a given adc channel. |
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* @dev: The device. |
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* @hwmon: Our state. |
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* @channel: The channel we're reading from. |
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* |
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* Read a value from the @channel with the proper locking and sleep until |
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* either the read completes or we timeout awaiting the ADC core to get |
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* back to us. |
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*/ |
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static int s3c_hwmon_read_ch(struct device *dev, |
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struct s3c_hwmon *hwmon, int channel) |
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{ |
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int ret; |
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ret = mutex_lock_interruptible(&hwmon->lock); |
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if (ret < 0) |
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return ret; |
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dev_dbg(dev, "reading channel %d\n", channel); |
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ret = s3c_adc_read(hwmon->client, channel); |
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mutex_unlock(&hwmon->lock); |
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return ret; |
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} |
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#ifdef CONFIG_SENSORS_S3C_RAW |
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/** |
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* s3c_hwmon_show_raw - show a conversion from the raw channel number. |
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* @dev: The device that the attribute belongs to. |
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* @attr: The attribute being read. |
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* @buf: The result buffer. |
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* |
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* This show deals with the raw attribute, registered for each possible |
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* ADC channel. This does a conversion and returns the raw (un-scaled) |
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* value returned from the hardware. |
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*/ |
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static ssize_t s3c_hwmon_show_raw(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct s3c_hwmon *adc = dev_get_drvdata(dev); |
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struct sensor_device_attribute *sa = to_sensor_dev_attr(attr); |
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int ret; |
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ret = s3c_hwmon_read_ch(dev, adc, sa->index); |
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return (ret < 0) ? ret : snprintf(buf, PAGE_SIZE, "%d\n", ret); |
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} |
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static SENSOR_DEVICE_ATTR(adc0_raw, S_IRUGO, s3c_hwmon_show_raw, NULL, 0); |
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static SENSOR_DEVICE_ATTR(adc1_raw, S_IRUGO, s3c_hwmon_show_raw, NULL, 1); |
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static SENSOR_DEVICE_ATTR(adc2_raw, S_IRUGO, s3c_hwmon_show_raw, NULL, 2); |
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static SENSOR_DEVICE_ATTR(adc3_raw, S_IRUGO, s3c_hwmon_show_raw, NULL, 3); |
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static SENSOR_DEVICE_ATTR(adc4_raw, S_IRUGO, s3c_hwmon_show_raw, NULL, 4); |
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static SENSOR_DEVICE_ATTR(adc5_raw, S_IRUGO, s3c_hwmon_show_raw, NULL, 5); |
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static SENSOR_DEVICE_ATTR(adc6_raw, S_IRUGO, s3c_hwmon_show_raw, NULL, 6); |
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static SENSOR_DEVICE_ATTR(adc7_raw, S_IRUGO, s3c_hwmon_show_raw, NULL, 7); |
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static struct attribute *s3c_hwmon_attrs[9] = { |
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&sensor_dev_attr_adc0_raw.dev_attr.attr, |
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&sensor_dev_attr_adc1_raw.dev_attr.attr, |
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&sensor_dev_attr_adc2_raw.dev_attr.attr, |
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&sensor_dev_attr_adc3_raw.dev_attr.attr, |
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&sensor_dev_attr_adc4_raw.dev_attr.attr, |
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&sensor_dev_attr_adc5_raw.dev_attr.attr, |
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&sensor_dev_attr_adc6_raw.dev_attr.attr, |
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&sensor_dev_attr_adc7_raw.dev_attr.attr, |
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NULL, |
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}; |
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static struct attribute_group s3c_hwmon_attrgroup = { |
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.attrs = s3c_hwmon_attrs, |
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}; |
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static inline int s3c_hwmon_add_raw(struct device *dev) |
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{ |
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return sysfs_create_group(&dev->kobj, &s3c_hwmon_attrgroup); |
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} |
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static inline void s3c_hwmon_remove_raw(struct device *dev) |
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{ |
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sysfs_remove_group(&dev->kobj, &s3c_hwmon_attrgroup); |
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} |
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#else |
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static inline int s3c_hwmon_add_raw(struct device *dev) { return 0; } |
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static inline void s3c_hwmon_remove_raw(struct device *dev) { } |
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#endif /* CONFIG_SENSORS_S3C_RAW */ |
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/** |
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* s3c_hwmon_ch_show - show value of a given channel |
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* @dev: The device that the attribute belongs to. |
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* @attr: The attribute being read. |
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* @buf: The result buffer. |
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* |
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* Read a value from the ADC and scale it before returning it to the |
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* caller. The scale factor is gained from the channel configuration |
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* passed via the platform data when the device was registered. |
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*/ |
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static ssize_t s3c_hwmon_ch_show(struct device *dev, |
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struct device_attribute *attr, |
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char *buf) |
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{ |
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struct sensor_device_attribute *sen_attr = to_sensor_dev_attr(attr); |
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struct s3c_hwmon *hwmon = dev_get_drvdata(dev); |
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struct s3c_hwmon_pdata *pdata = dev_get_platdata(dev); |
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struct s3c_hwmon_chcfg *cfg; |
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int ret; |
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cfg = pdata->in[sen_attr->index]; |
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ret = s3c_hwmon_read_ch(dev, hwmon, sen_attr->index); |
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if (ret < 0) |
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return ret; |
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ret *= cfg->mult; |
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ret = DIV_ROUND_CLOSEST(ret, cfg->div); |
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return sysfs_emit(buf, "%d\n", ret); |
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} |
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/** |
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* s3c_hwmon_label_show - show label name of the given channel. |
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* @dev: The device that the attribute belongs to. |
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* @attr: The attribute being read. |
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* @buf: The result buffer. |
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* |
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* Return the label name of a given channel |
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*/ |
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static ssize_t s3c_hwmon_label_show(struct device *dev, |
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struct device_attribute *attr, |
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char *buf) |
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{ |
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struct sensor_device_attribute *sen_attr = to_sensor_dev_attr(attr); |
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struct s3c_hwmon_pdata *pdata = dev_get_platdata(dev); |
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struct s3c_hwmon_chcfg *cfg; |
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cfg = pdata->in[sen_attr->index]; |
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return sysfs_emit(buf, "%s\n", cfg->name); |
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} |
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/** |
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* s3c_hwmon_create_attr - create hwmon attribute for given channel. |
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* @dev: The device to create the attribute on. |
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* @cfg: The channel configuration passed from the platform data. |
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* @channel: The ADC channel number to process. |
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* |
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* Create the scaled attribute for use with hwmon from the specified |
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* platform data in @pdata. The sysfs entry is handled by the routine |
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* s3c_hwmon_ch_show(). |
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* |
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* The attribute name is taken from the configuration data if present |
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* otherwise the name is taken by concatenating in_ with the channel |
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* number. |
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*/ |
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static int s3c_hwmon_create_attr(struct device *dev, |
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struct s3c_hwmon_chcfg *cfg, |
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struct s3c_hwmon_attr *attrs, |
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int channel) |
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{ |
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struct sensor_device_attribute *attr; |
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int ret; |
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snprintf(attrs->in_name, sizeof(attrs->in_name), "in%d_input", channel); |
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attr = &attrs->in; |
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attr->index = channel; |
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sysfs_attr_init(&attr->dev_attr.attr); |
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attr->dev_attr.attr.name = attrs->in_name; |
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attr->dev_attr.attr.mode = S_IRUGO; |
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attr->dev_attr.show = s3c_hwmon_ch_show; |
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ret = device_create_file(dev, &attr->dev_attr); |
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if (ret < 0) { |
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dev_err(dev, "failed to create input attribute\n"); |
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return ret; |
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} |
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/* if this has a name, add a label */ |
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if (cfg->name) { |
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snprintf(attrs->label_name, sizeof(attrs->label_name), |
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"in%d_label", channel); |
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attr = &attrs->label; |
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attr->index = channel; |
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sysfs_attr_init(&attr->dev_attr.attr); |
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attr->dev_attr.attr.name = attrs->label_name; |
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attr->dev_attr.attr.mode = S_IRUGO; |
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attr->dev_attr.show = s3c_hwmon_label_show; |
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ret = device_create_file(dev, &attr->dev_attr); |
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if (ret < 0) { |
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device_remove_file(dev, &attrs->in.dev_attr); |
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dev_err(dev, "failed to create label attribute\n"); |
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} |
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} |
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return ret; |
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} |
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static void s3c_hwmon_remove_attr(struct device *dev, |
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struct s3c_hwmon_attr *attrs) |
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{ |
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device_remove_file(dev, &attrs->in.dev_attr); |
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device_remove_file(dev, &attrs->label.dev_attr); |
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} |
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/** |
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* s3c_hwmon_probe - device probe entry. |
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* @dev: The device being probed. |
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*/ |
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static int s3c_hwmon_probe(struct platform_device *dev) |
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{ |
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struct s3c_hwmon_pdata *pdata = dev_get_platdata(&dev->dev); |
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struct s3c_hwmon *hwmon; |
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int ret = 0; |
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int i; |
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if (!pdata) { |
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dev_err(&dev->dev, "no platform data supplied\n"); |
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return -EINVAL; |
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} |
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hwmon = devm_kzalloc(&dev->dev, sizeof(struct s3c_hwmon), GFP_KERNEL); |
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if (hwmon == NULL) |
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return -ENOMEM; |
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platform_set_drvdata(dev, hwmon); |
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mutex_init(&hwmon->lock); |
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/* Register with the core ADC driver. */ |
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hwmon->client = s3c_adc_register(dev, NULL, NULL, 0); |
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if (IS_ERR(hwmon->client)) { |
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dev_err(&dev->dev, "cannot register adc\n"); |
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return PTR_ERR(hwmon->client); |
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} |
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/* add attributes for our adc devices. */ |
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ret = s3c_hwmon_add_raw(&dev->dev); |
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if (ret) |
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goto err_registered; |
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/* register with the hwmon core */ |
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hwmon->hwmon_dev = hwmon_device_register(&dev->dev); |
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if (IS_ERR(hwmon->hwmon_dev)) { |
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dev_err(&dev->dev, "error registering with hwmon\n"); |
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ret = PTR_ERR(hwmon->hwmon_dev); |
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goto err_raw_attribute; |
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} |
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for (i = 0; i < ARRAY_SIZE(pdata->in); i++) { |
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struct s3c_hwmon_chcfg *cfg = pdata->in[i]; |
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if (!cfg) |
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continue; |
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if (cfg->mult >= 0x10000) |
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dev_warn(&dev->dev, |
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"channel %d multiplier too large\n", |
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i); |
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if (cfg->div == 0) { |
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dev_err(&dev->dev, "channel %d divider zero\n", i); |
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continue; |
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} |
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ret = s3c_hwmon_create_attr(&dev->dev, pdata->in[i], |
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&hwmon->attrs[i], i); |
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if (ret) { |
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dev_err(&dev->dev, |
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"error creating channel %d\n", i); |
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for (i--; i >= 0; i--) |
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s3c_hwmon_remove_attr(&dev->dev, |
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&hwmon->attrs[i]); |
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goto err_hwmon_register; |
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} |
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} |
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return 0; |
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err_hwmon_register: |
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hwmon_device_unregister(hwmon->hwmon_dev); |
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err_raw_attribute: |
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s3c_hwmon_remove_raw(&dev->dev); |
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err_registered: |
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s3c_adc_release(hwmon->client); |
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return ret; |
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} |
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static int s3c_hwmon_remove(struct platform_device *dev) |
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{ |
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struct s3c_hwmon *hwmon = platform_get_drvdata(dev); |
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int i; |
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s3c_hwmon_remove_raw(&dev->dev); |
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for (i = 0; i < ARRAY_SIZE(hwmon->attrs); i++) |
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s3c_hwmon_remove_attr(&dev->dev, &hwmon->attrs[i]); |
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hwmon_device_unregister(hwmon->hwmon_dev); |
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s3c_adc_release(hwmon->client); |
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return 0; |
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} |
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static struct platform_driver s3c_hwmon_driver = { |
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.driver = { |
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.name = "s3c-hwmon", |
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}, |
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.probe = s3c_hwmon_probe, |
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.remove = s3c_hwmon_remove, |
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}; |
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module_platform_driver(s3c_hwmon_driver); |
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MODULE_AUTHOR("Ben Dooks <[email protected]>"); |
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MODULE_DESCRIPTION("S3C ADC HWMon driver"); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_ALIAS("platform:s3c-hwmon");
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