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    Subject[PATCH 3/5] [hwmon] add Freescale MC13783 adc driver
    Date
    From: Luotao Fu <l.fu@pengutronix.de>

    This driver provides support for the ADC integrated into the
    Freescale MC13783 PMIC.

    Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
    Cc: Hans de Goede <hdegoede@redhat.com>
    Cc: Andrew Morton <akpm@linux-foundation.org>
    Cc: Eric Piel <eric.piel@tremplin-utc.net>
    Cc: lm-sensors@lm-sensors.org
    ---
    drivers/hwmon/Kconfig | 6 ++
    drivers/hwmon/Makefile | 1 +
    drivers/hwmon/mc13783-adc.c | 181 +++++++++++++++++++++++++++++++++++++++++++
    3 files changed, 188 insertions(+), 0 deletions(-)
    create mode 100644 drivers/hwmon/mc13783-adc.c

    diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
    index 2d50166..a7e34fd 100644
    --- a/drivers/hwmon/Kconfig
    +++ b/drivers/hwmon/Kconfig
    @@ -1017,6 +1017,12 @@ config SENSORS_APPLESMC
    Say Y here if you have an applicable laptop and want to experience
    the awesome power of applesmc.

    +config SENSORS_MC13783_ADC
    + tristate "Freescale MC13783 ADC"
    + depends on MFD_MC13783
    + help
    + Support for the ad converter on mc13783 pmic.
    +
    config HWMON_DEBUG_CHIP
    bool "Hardware Monitoring Chip debugging messages"
    default n
    diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
    index b793dce..9b4e131 100644
    --- a/drivers/hwmon/Makefile
    +++ b/drivers/hwmon/Makefile
    @@ -89,6 +89,7 @@ obj-$(CONFIG_SENSORS_VT8231) += vt8231.o
    obj-$(CONFIG_SENSORS_W83627EHF) += w83627ehf.o
    obj-$(CONFIG_SENSORS_W83L785TS) += w83l785ts.o
    obj-$(CONFIG_SENSORS_W83L786NG) += w83l786ng.o
    +obj-$(CONFIG_SENSORS_MC13783_ADC) += mc13783-adc.o

    ifeq ($(CONFIG_HWMON_DEBUG_CHIP),y)
    EXTRA_CFLAGS += -DDEBUG
    diff --git a/drivers/hwmon/mc13783-adc.c b/drivers/hwmon/mc13783-adc.c
    new file mode 100644
    index 0000000..885c009
    --- /dev/null
    +++ b/drivers/hwmon/mc13783-adc.c
    @@ -0,0 +1,181 @@
    +/*
    + * Driver for the Freescale Semiconductor MC13783 adc.
    + *
    + * Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved.
    + * Copyright (C) 2009 Sascha Hauer, Pengutronix
    + *
    + * This program is free software; you can redistribute it and/or
    + * modify it under the terms of the GNU General Public License
    + * as published by the Free Software Foundation; either version 2
    + * of the License, or (at your option) any later version.
    + * This program is distributed in the hope that it will be useful,
    + * but WITHOUT ANY WARRANTY; without even the implied warranty of
    + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    + * GNU General Public License for more details.
    + *
    + * You should have received a copy of the GNU General Public License along with
    + * this program; if not, write to the Free Software Foundation, Inc., 51
    + * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
    + */
    +
    +#include <linux/mfd/mc13783-private.h>
    +#include <linux/platform_device.h>
    +#include <linux/hwmon-sysfs.h>
    +#include <linux/completion.h>
    +#include <linux/kernel.h>
    +#include <linux/module.h>
    +#include <linux/delay.h>
    +#include <linux/hwmon.h>
    +#include <linux/input.h>
    +#include <linux/mutex.h>
    +#include <linux/sched.h>
    +#include <linux/init.h>
    +
    +#define MC13783_ADC_NAME "mc13783-adc"
    +
    +struct mc13783_adc_priv {
    + struct mc13783 *mc13783;
    + struct device *hwmon_dev;
    +};
    +
    +static ssize_t mc13783_adc_show_name(struct device *dev, struct device_attribute
    + *devattr, char *buf)
    +{
    + return sprintf(buf, "mc13783_adc\n");
    +}
    +
    +static ssize_t mc13783_adc_read(struct device *dev,
    + struct device_attribute *devattr, char *buf)
    +{
    + struct platform_device *pdev = to_platform_device(dev);
    + struct mc13783_adc_priv *priv = platform_get_drvdata(pdev);
    + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
    + unsigned int channel = attr->index;
    + unsigned int res;
    + unsigned int sample[4];
    +
    + mc13783_adc_do_conversion(priv->mc13783, MC13783_ADC_MODE_MULT_CHAN,
    + channel, sample);
    +
    + channel &= 0x7;
    +
    + res = (sample[channel % 4] >> (channel > 3 ? 14 : 2)) & 0x3ff;
    +
    + return sprintf(buf, "%u\n", res);
    +}
    +
    +static struct sensor_device_attribute mc13783_adc_ctl[] = {
    + SENSOR_ATTR(name, S_IRUGO, mc13783_adc_show_name, NULL, 0),
    + SENSOR_ATTR(in0_input, S_IRUGO, mc13783_adc_read, NULL, 0),
    + SENSOR_ATTR(in1_input, S_IRUGO, mc13783_adc_read, NULL, 1),
    + SENSOR_ATTR(in2_input, S_IRUGO, mc13783_adc_read, NULL, 2),
    + SENSOR_ATTR(in3_input, S_IRUGO, mc13783_adc_read, NULL, 3),
    + SENSOR_ATTR(in4_input, S_IRUGO, mc13783_adc_read, NULL, 4),
    + SENSOR_ATTR(in5_input, S_IRUGO, mc13783_adc_read, NULL, 5),
    + SENSOR_ATTR(in6_input, S_IRUGO, mc13783_adc_read, NULL, 6),
    + SENSOR_ATTR(in7_input, S_IRUGO, mc13783_adc_read, NULL, 7),
    + SENSOR_ATTR(in8_input, S_IRUGO, mc13783_adc_read, NULL, 8),
    + SENSOR_ATTR(in9_input, S_IRUGO, mc13783_adc_read, NULL, 9),
    + SENSOR_ATTR(in10_input, S_IRUGO, mc13783_adc_read, NULL, 10),
    + SENSOR_ATTR(in11_input, S_IRUGO, mc13783_adc_read, NULL, 11),
    + SENSOR_ATTR(in12_input, S_IRUGO, mc13783_adc_read, NULL, 12),
    + SENSOR_ATTR(in13_input, S_IRUGO, mc13783_adc_read, NULL, 13),
    + SENSOR_ATTR(in14_input, S_IRUGO, mc13783_adc_read, NULL, 14),
    + SENSOR_ATTR(in15_input, S_IRUGO, mc13783_adc_read, NULL, 15),
    +};
    +
    +static int __init mc13783_adc_probe(struct platform_device *pdev)
    +{
    + struct mc13783_adc_priv *priv;
    + int ret, i;
    + int entries;
    +
    + priv = kzalloc(sizeof(*priv), GFP_KERNEL);
    + if (!priv)
    + return -ENOMEM;
    +
    + priv->mc13783 = pdev->dev.platform_data;
    +
    + entries = ARRAY_SIZE(mc13783_adc_ctl);
    +
    + /* last four channels may be occupied by the touchscreen */
    + if (priv->mc13783->flags & MC13783_USE_TOUCHSCREEN)
    + entries -= 4;
    +
    + for (i = 0; i < entries; i++) {
    + ret = device_create_file(&pdev->dev,
    + &mc13783_adc_ctl[i].dev_attr);
    + if (ret) {
    + dev_err(&pdev->dev,
    + "device_create_file failed with %d.\n", ret);
    + goto out_err;
    + }
    + }
    +
    + priv->hwmon_dev = hwmon_device_register(&pdev->dev);
    + if (IS_ERR(priv->hwmon_dev)) {
    + ret = PTR_ERR(priv->hwmon_dev);
    + dev_err(&pdev->dev,
    + "hwmon_device_register failed with %d.\n", ret);
    + goto out_err;
    + }
    +
    + platform_set_drvdata(pdev, priv);
    +
    + return 0;
    +
    +out_err:
    + for (i--; i >= 0; i--)
    + device_remove_file(&pdev->dev, &mc13783_adc_ctl[i].dev_attr);
    +
    + kfree(priv);
    +
    + return ret;
    +}
    +
    +static int __devexit mc13783_adc_remove(struct platform_device *pdev)
    +{
    + struct mc13783_adc_priv *priv = platform_get_drvdata(pdev);
    + int entries;
    + int i;
    +
    + hwmon_device_unregister(&pdev->dev);
    +
    + entries = ARRAY_SIZE(mc13783_adc_ctl);
    +
    + if (priv->mc13783->flags & MC13783_USE_TOUCHSCREEN)
    + entries -= 4;
    +
    + for (i = 0; i < entries; i++)
    + device_remove_file(&pdev->dev, &mc13783_adc_ctl[i].dev_attr);
    +
    + kfree(priv);
    +
    + return 0;
    +}
    +
    +static struct platform_driver mc13783_adc_driver = {
    + .probe = mc13783_adc_probe,
    + .remove = __devexit_p(mc13783_adc_remove),
    + .driver = {
    + .owner = THIS_MODULE,
    + .name = MC13783_ADC_NAME,
    + },
    +};
    +
    +static int __init mc13783_adc_init(void)
    +{
    + return platform_driver_register(&mc13783_adc_driver);
    +}
    +
    +static void __exit mc13783_adc_exit(void)
    +{
    + platform_driver_unregister(&mc13783_adc_driver);
    +}
    +
    +module_init(mc13783_adc_init);
    +module_exit(mc13783_adc_exit);
    +
    +MODULE_DESCRIPTION("MC13783 input touchscreen driver");
    +MODULE_AUTHOR("Luotao Fu, <l.fu@pengutronix.de>");
    +MODULE_LICENSE("GPL");
    --
    1.6.3.3


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