Release 4.10 drivers/hwmon/max1111.c

/*
 * 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 <eric.miao@marvell.com>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  publishhed by the Free Software Foundation.
 */

#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 { max1110, max1111, max1112, max1113 };


#define MAX1111_TX_BUF_SIZE	1

#define MAX1111_RX_BUF_SIZE	2

/* MAX1111 Commands */

#define MAX1111_CTRL_PD0      (1u << 0)

#define MAX1111_CTRL_PD1      (1u << 1)

#define MAX1111_CTRL_SGL      (1u << 2)

#define MAX1111_CTRL_UNI      (1u << 3)

#define MAX1110_CTRL_SEL_SH   (4)

#define MAX1111_CTRL_SEL_SH   (5)	
/* NOTE: bit 4 is ignored */

#define MAX1111_CTRL_STR      (1u << 7)


struct max1111_data {
	
struct spi_device	*spi;
	
struct device		*hwmon_dev;
	
struct spi_message	msg;
	
struct spi_transfer	xfer[2];
	
uint8_t tx_buf[MAX1111_TX_BUF_SIZE];
	
uint8_t rx_buf[MAX1111_RX_BUF_SIZE];
	
struct mutex		drvdata_lock;
	/* protect msg, xfer and buffers from multiple access */
	
int			sel_sh;
	
int			lsb;
};



static int max1111_read(struct device *dev, int channel)
{
	struct max1111_data *data = dev_get_drvdata(dev);
	uint8_t v1, v2;
	int err;

	/* writing to drvdata struct is not thread safe, wait on mutex */
	mutex_lock(&data->drvdata_lock);

	data->tx_buf[0] = (channel << data->sel_sh) |
		MAX1111_CTRL_PD0 | MAX1111_CTRL_PD1 |
		MAX1111_CTRL_SGL | MAX1111_CTRL_UNI | MAX1111_CTRL_STR;

	err = spi_sync(data->spi, &data->msg);
	if (err < 0) {
		dev_err(dev, "spi_sync failed with %d\n", err);
		mutex_unlock(&data->drvdata_lock);
		return err;
	}

	v1 = data->rx_buf[0];
	v2 = data->rx_buf[1];

	mutex_unlock(&data->drvdata_lock);

	if ((v1 & 0xc0) || (v2 & 0x3f))
		return -EINVAL;

	return (v1 << 2) | (v2 >> 6);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
eric miao
eric miao
137
83.03%
1
33.33%
pavel herrmann
pavel herrmann
25
15.15%
1
33.33%
guenter roeck
guenter roeck
3
1.82%
1
33.33%
Total
165
100.00%
3
100.00%

#ifdef CONFIG_SHARPSL_PM

static struct max1111_data *the_max1111;



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

	return max1111_read(&the_max1111->spi->dev, channel);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
eric miao
eric miao
21
60.00%
1
50.00%
guenter roeck
guenter roeck
14
40.00%
1
50.00%
Total
35
100.00%
2
100.00%


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 show_name(struct device *dev,
			 struct device_attribute *attr, char *buf)
{
	return sprintf(buf, "%s\n", to_spi_device(dev)->modalias);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
eric miao
eric miao
27
77.14%
1
50.00%
guenter roeck
guenter roeck
8
22.86%
1
50.00%
Total
35
100.00%
2
100.00%



static ssize_t show_adc(struct device *dev,
			struct device_attribute *attr, char *buf)
{
	struct max1111_data *data = dev_get_drvdata(dev);
	int channel = to_sensor_dev_attr(attr)->index;
	int ret;

	ret = max1111_read(dev, channel);
	if (ret < 0)
		return ret;

	/*
         * Assume the reference voltage to be 2.048V or 4.096V, with an 8-bit
         * sample. The LSB weight is 8mV or 16mV depending on the chip type.
         */
	return sprintf(buf, "%d\n", ret * data->lsb);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
eric miao
eric miao
62
81.58%
2
66.67%
guenter roeck
guenter roeck
14
18.42%
1
33.33%
Total
76
100.00%
3
100.00%


#define MAX1111_ADC_ATTR(_id)		\
	SENSOR_DEVICE_ATTR(in##_id##_input, S_IRUGO, show_adc, NULL, _id)

static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
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[] = {
	&dev_attr_name.attr,
	&sensor_dev_attr_in0_input.dev_attr.attr,
	&sensor_dev_attr_in1_input.dev_attr.attr,
	&sensor_dev_attr_in2_input.dev_attr.attr,
	&sensor_dev_attr_in3_input.dev_attr.attr,
	NULL,
};


static const struct attribute_group max1111_attr_group = {
	.attrs	= max1111_attributes,
};


static struct attribute *max1110_attributes[] = {
	&sensor_dev_attr_in4_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,
	NULL,
};


static const struct attribute_group max1110_attr_group = {
	.attrs	= max1110_attributes,
};



static int setup_transfer(struct max1111_data *data)
{
	struct spi_message *m;
	struct spi_transfer *x;

	m = &data->msg;
	x = &data->xfer[0];

	spi_message_init(m);

	x->tx_buf = &data->tx_buf[0];
	x->len = MAX1111_TX_BUF_SIZE;
	spi_message_add_tail(x, m);

	x++;
	x->rx_buf = &data->rx_buf[0];
	x->len = MAX1111_RX_BUF_SIZE;
	spi_message_add_tail(x, m);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
eric miao
eric miao
97
97.98%
1
50.00%
jean delvare
jean delvare
2
2.02%
1
50.00%
Total
99
100.00%
2
100.00%



static int max1111_probe(struct spi_device *spi)
{
	enum chips chip = spi_get_device_id(spi)->driver_data;
	struct max1111_data *data;
	int err;

	spi->bits_per_word = 8;
	spi->mode = SPI_MODE_0;
	err = spi_setup(spi);
	if (err < 0)
		return err;

	data = devm_kzalloc(&spi->dev, sizeof(struct max1111_data), GFP_KERNEL);
	if (data == NULL)
		return -ENOMEM;

	switch (chip) {
	case max1110:
		data->lsb = 8;
		data->sel_sh = MAX1110_CTRL_SEL_SH;
		break;
	case max1111:
		data->lsb = 8;
		data->sel_sh = MAX1111_CTRL_SEL_SH;
		break;
	case max1112:
		data->lsb = 16;
		data->sel_sh = MAX1110_CTRL_SEL_SH;
		break;
	case max1113:
		data->lsb = 16;
		data->sel_sh = MAX1111_CTRL_SEL_SH;
		break;
	}
	err = setup_transfer(data);
	if (err)
		return err;

	mutex_init(&data->drvdata_lock);

	data->spi = spi;
	spi_set_drvdata(spi, data);

	err = sysfs_create_group(&spi->dev.kobj, &max1111_attr_group);
	if (err) {
		dev_err(&spi->dev, "failed to create attribute group\n");
		return err;
	}
	if (chip == max1110 || chip == max1112) {
		err = sysfs_create_group(&spi->dev.kobj, &max1110_attr_group);
		if (err) {
			dev_err(&spi->dev,
				"failed to create extended attribute group\n");
			goto err_remove;
		}
	}

	data->hwmon_dev = hwmon_device_register(&spi->dev);
	if (IS_ERR(data->hwmon_dev)) {
		dev_err(&spi->dev, "failed to create hwmon device\n");
		err = PTR_ERR(data->hwmon_dev);
		goto err_remove;
	}

#ifdef CONFIG_SHARPSL_PM
	the_max1111 = data;
#endif
	return 0;

err_remove:
	sysfs_remove_group(&spi->dev.kobj, &max1110_attr_group);
	sysfs_remove_group(&spi->dev.kobj, &max1111_attr_group);
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
eric miao
eric miao
199
55.43%
2
40.00%
guenter roeck
guenter roeck
152
42.34%
2
40.00%
pavel herrmann
pavel herrmann
8
2.23%
1
20.00%
Total
359
100.00%
5
100.00%



static int max1111_remove(struct spi_device *spi)
{
	struct max1111_data *data = spi_get_drvdata(spi);

#ifdef CONFIG_SHARPSL_PM
	the_max1111 = NULL;
#endif
	hwmon_device_unregister(data->hwmon_dev);
	sysfs_remove_group(&spi->dev.kobj, &max1110_attr_group);
	sysfs_remove_group(&spi->dev.kobj, &max1111_attr_group);
	mutex_destroy(&data->drvdata_lock);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
eric miao
eric miao
44
59.46%
1
25.00%
guenter roeck
guenter roeck
22
29.73%
2
50.00%
pavel herrmann
pavel herrmann
8
10.81%
1
25.00%
Total
74
100.00%
4
100.00%


static const struct spi_device_id max1111_ids[] = {
	{ "max1110", max1110 },
	{ "max1111", max1111 },
	{ "max1112", max1112 },
	{ "max1113", max1113 },
	{ },
};
MODULE_DEVICE_TABLE(spi, max1111_ids);


static struct spi_driver max1111_driver = {
	.driver		= {
		.name	= "max1111",
        },
	.id_table	= max1111_ids,
	.probe		= max1111_probe,
	.remove		= max1111_remove,
};


module_spi_driver(max1111_driver);

MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>");
MODULE_DESCRIPTION("MAX1110/MAX1111/MAX1112/MAX1113 ADC Driver");
MODULE_LICENSE("GPL");
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
eric miao
eric miao
837
66.69%
3
27.27%
guenter roeck
guenter roeck
359
28.61%
3
27.27%
pavel herrmann
pavel herrmann
46
3.67%
1
9.09%
jean delvare
jean delvare
8
0.64%
1
9.09%
tejun heo
tejun heo
3
0.24%
1
9.09%
frans meulenbroeks
frans meulenbroeks
1
0.08%
1
9.09%
axel lin
axel lin
1
0.08%
1
9.09%
Total
1255
100.00%
11
100.00%
Directory: drivers/hwmon

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.