forked from luck/tmp_suning_uos_patched
hwmon: add max1111 Low-power Multichannel Serial 8-bit ADCs
Driver based on corgi_ssp.c and sharpsl_pm.c, previously done by Richard Purdie and many others. Now changed to generic HWMON device and expose all the ADC input value through sysfs. Signed-off-by: Eric Miao <eric.miao@marvell.com> Acked-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Eric Miao
Russell King
parent
dd89ccb23a
commit
55b951e7e6
@ -540,6 +540,15 @@ config SENSORS_LM93
|
||||
This driver can also be built as a module. If so, the module
|
||||
will be called lm93.
|
||||
|
||||
config SENSORS_MAX1111
|
||||
tristate "Maxim MAX1111 Multichannel, Serial 8-bit ADC chip"
|
||||
depends on SPI_MASTER
|
||||
help
|
||||
Say y here to support Maxim's MAX1111 ADC chips.
|
||||
|
||||
This driver can also be built as a module. If so, the module
|
||||
will be called max1111.
|
||||
|
||||
config SENSORS_MAX1619
|
||||
tristate "Maxim MAX1619 sensor chip"
|
||||
depends on I2C
|
||||
|
||||
@ -59,6 +59,7 @@ obj-$(CONFIG_SENSORS_LM87) += lm87.o
|
||||
obj-$(CONFIG_SENSORS_LM90) += lm90.o
|
||||
obj-$(CONFIG_SENSORS_LM92) += lm92.o
|
||||
obj-$(CONFIG_SENSORS_LM93) += lm93.o
|
||||
obj-$(CONFIG_SENSORS_MAX1111) += max1111.o
|
||||
obj-$(CONFIG_SENSORS_MAX1619) += max1619.o
|
||||
obj-$(CONFIG_SENSORS_MAX6650) += max6650.o
|
||||
obj-$(CONFIG_SENSORS_PC87360) += pc87360.o
|
||||
|
||||
231
drivers/hwmon/max1111.c
Normal file
231
drivers/hwmon/max1111.c
Normal file
@ -0,0 +1,231 @@
|
||||
/*
|
||||
* 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>
|
||||
|
||||
#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 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;
|
||||
uint8_t *rx_buf;
|
||||
};
|
||||
|
||||
static int max1111_read(struct device *dev, int channel)
|
||||
{
|
||||
struct max1111_data *data = dev_get_drvdata(dev);
|
||||
uint8_t v1, v2;
|
||||
int err;
|
||||
|
||||
data->tx_buf[0] = (channel << MAX1111_CTRL_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);
|
||||
return err;
|
||||
}
|
||||
|
||||
v1 = data->rx_buf[0];
|
||||
v2 = data->rx_buf[1];
|
||||
|
||||
if ((v1 & 0xc0) || (v2 & 0x3f))
|
||||
return -EINVAL;
|
||||
|
||||
return (v1 << 2) | (v2 >> 6);
|
||||
}
|
||||
|
||||
/*
|
||||
* 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, "max1111\n");
|
||||
}
|
||||
|
||||
static ssize_t show_adc(struct device *dev,
|
||||
struct device_attribute *attr, char *buf)
|
||||
{
|
||||
int channel = to_sensor_dev_attr(attr)->index;
|
||||
int ret;
|
||||
|
||||
ret = max1111_read(dev, channel);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
return sprintf(buf, "%d\n", ret);
|
||||
}
|
||||
|
||||
#define MAX1111_ADC_ATTR(_id) \
|
||||
SENSOR_DEVICE_ATTR(adc##_id##_in, 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 struct attribute *max1111_attributes[] = {
|
||||
&dev_attr_name.attr,
|
||||
&sensor_dev_attr_adc0_in.dev_attr.attr,
|
||||
&sensor_dev_attr_adc1_in.dev_attr.attr,
|
||||
&sensor_dev_attr_adc2_in.dev_attr.attr,
|
||||
&sensor_dev_attr_adc3_in.dev_attr.attr,
|
||||
NULL,
|
||||
};
|
||||
|
||||
static const struct attribute_group max1111_attr_group = {
|
||||
.attrs = max1111_attributes,
|
||||
};
|
||||
|
||||
static int setup_transfer(struct max1111_data *data)
|
||||
{
|
||||
struct spi_message *m;
|
||||
struct spi_transfer *x;
|
||||
|
||||
data->tx_buf = kmalloc(MAX1111_TX_BUF_SIZE, GFP_KERNEL);
|
||||
if (!data->tx_buf)
|
||||
return -ENOMEM;
|
||||
|
||||
data->rx_buf = kmalloc(MAX1111_RX_BUF_SIZE, GFP_KERNEL);
|
||||
if (!data->rx_buf) {
|
||||
kfree(data->tx_buf);
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
m = &data->msg;
|
||||
x = &data->xfer[0];
|
||||
|
||||
spi_message_init(m);
|
||||
|
||||
x->tx_buf = &data->tx_buf[0];
|
||||
x->len = 1;
|
||||
spi_message_add_tail(x, m);
|
||||
|
||||
x++;
|
||||
x->rx_buf = &data->rx_buf[0];
|
||||
x->len = 2;
|
||||
spi_message_add_tail(x, m);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int __devinit max1111_probe(struct spi_device *spi)
|
||||
{
|
||||
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 = kzalloc(sizeof(struct max1111_data), GFP_KERNEL);
|
||||
if (data == NULL) {
|
||||
dev_err(&spi->dev, "failed to allocate memory\n");
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
err = setup_transfer(data);
|
||||
if (err)
|
||||
goto err_free_data;
|
||||
|
||||
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");
|
||||
goto err_free_all;
|
||||
}
|
||||
|
||||
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;
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
err_remove:
|
||||
sysfs_remove_group(&spi->dev.kobj, &max1111_attr_group);
|
||||
err_free_all:
|
||||
kfree(data->rx_buf);
|
||||
kfree(data->tx_buf);
|
||||
err_free_data:
|
||||
kfree(data);
|
||||
return err;
|
||||
}
|
||||
|
||||
static int __devexit max1111_remove(struct spi_device *spi)
|
||||
{
|
||||
struct max1111_data *data = spi_get_drvdata(spi);
|
||||
|
||||
hwmon_device_unregister(data->hwmon_dev);
|
||||
sysfs_remove_group(&spi->dev.kobj, &max1111_attr_group);
|
||||
kfree(data->rx_buf);
|
||||
kfree(data->tx_buf);
|
||||
kfree(data);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct spi_driver max1111_driver = {
|
||||
.driver = {
|
||||
.name = "max1111",
|
||||
.owner = THIS_MODULE,
|
||||
},
|
||||
.probe = max1111_probe,
|
||||
.remove = __devexit_p(max1111_remove),
|
||||
};
|
||||
|
||||
static int __init max1111_init(void)
|
||||
{
|
||||
return spi_register_driver(&max1111_driver);
|
||||
}
|
||||
module_init(max1111_init);
|
||||
|
||||
static void __exit max1111_exit(void)
|
||||
{
|
||||
spi_unregister_driver(&max1111_driver);
|
||||
}
|
||||
module_exit(max1111_exit);
|
||||
|
||||
MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>");
|
||||
MODULE_DESCRIPTION("MAX1111 ADC Driver");
|
||||
MODULE_LICENSE("GPL");
|
||||
Loading…
Reference in New Issue
Block a user