linux/drivers/hwmon/max1111.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * max1111.c - +2.7V, Low-Power, Multichannel, Serial 8-bit ADCs
 *
 * Based on arch/arm/mach-pxa/corgi_ssp.c
 *
 * Copyright (C) 2004-2005 Richard Purdie
 *
 * Copyright (C) 2008 Marvell International Ltd.
 *	Eric Miao <[email protected]>
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/spi/spi.h>
#include <linux/slab.h>

enum chips { … };

#define MAX1111_TX_BUF_SIZE …
#define MAX1111_RX_BUF_SIZE …

/* MAX1111 Commands */
#define MAX1111_CTRL_PD0 …
#define MAX1111_CTRL_PD1 …
#define MAX1111_CTRL_SGL …
#define MAX1111_CTRL_UNI …
#define MAX1110_CTRL_SEL_SH …
#define MAX1111_CTRL_SEL_SH …
#define MAX1111_CTRL_STR …

struct max1111_data { … };

static int max1111_read(struct device *dev, int channel)
{ … }

#ifdef CONFIG_SHARPSL_PM
static struct max1111_data *the_max1111;

int max1111_read_channel(int channel);
int max1111_read_channel(int channel)
{
	if (!the_max1111 || !the_max1111->spi)
		return -ENODEV;

	return max1111_read(&the_max1111->spi->dev, channel);
}
EXPORT_SYMBOL(max1111_read_channel);
#endif

/*
 * NOTE: SPI devices do not have a default 'name' attribute, which is
 * likely to be used by hwmon applications to distinguish between
 * different devices, explicitly add a name attribute here.
 */
static ssize_t name_show(struct device *dev,
			 struct device_attribute *attr, char *buf)
{ … }

static ssize_t show_adc(struct device *dev,
			struct device_attribute *attr, char *buf)
{ … }

#define MAX1111_ADC_ATTR(_id) …

static DEVICE_ATTR_RO(name);
static MAX1111_ADC_ATTR(0);
static MAX1111_ADC_ATTR(1);
static MAX1111_ADC_ATTR(2);
static MAX1111_ADC_ATTR(3);
static MAX1111_ADC_ATTR(4);
static MAX1111_ADC_ATTR(5);
static MAX1111_ADC_ATTR(6);
static MAX1111_ADC_ATTR(7);

static struct attribute *max1111_attributes[] = …;

static const struct attribute_group max1111_attr_group = …;

static struct attribute *max1110_attributes[] = …;

static const struct attribute_group max1110_attr_group = …;

static int setup_transfer(struct max1111_data *data)
{ … }

static int max1111_probe(struct spi_device *spi)
{ … }

static void max1111_remove(struct spi_device *spi)
{ … }

static const struct spi_device_id max1111_ids[] = …;
MODULE_DEVICE_TABLE(spi, max1111_ids);

static struct spi_driver max1111_driver = …;

module_spi_driver(…) …;

MODULE_AUTHOR(…) …;
MODULE_DESCRIPTION(…) …;
MODULE_LICENSE(…) …;