hwmon: Add Freescale MC13783 ADC driver

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

Signed-off-by: Luotao Fu <l.fu@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Reviewed-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Cc: Eric Piel <eric.piel@tremplin-utc.net>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

1 files changed, 236 insertions, 0 deletions

diff --git a/drivers/hwmon/mc13783-adc.c b/drivers/hwmon/mc13783-adc.c
new file mode 100644
index 000000000000..883fa8197da4
--- /dev/null
+++ b/drivers/hwmon/mc13783-adc.c
@@ -0,0 +1,236 @@
+/*
+ * 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/kernel.h>
+#include <linux/module.h>
+#include <linux/hwmon.h>
+#include <linux/init.h>
+#include <linux/err.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 int mc13783_adc_read(struct device *dev,
+                struct device_attribute *devattr, unsigned int *val)
+{
+        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 sample[4];
+        int ret;
+
+        ret = mc13783_adc_do_conversion(priv->mc13783,
+                        MC13783_ADC_MODE_MULT_CHAN,
+                        channel, sample);
+        if (ret)
+                return ret;
+
+        channel &= 0x7;
+
+        *val = (sample[channel % 4] >> (channel > 3 ? 14 : 2)) & 0x3ff;
+
+        return 0;
+}
+
+static ssize_t mc13783_adc_read_bp(struct device *dev,
+                struct device_attribute *devattr, char *buf)
+{
+        unsigned val;
+        int ret = mc13783_adc_read(dev, devattr, &val);
+
+        if (ret)
+                return ret;
+
+        /*
+         * BP (channel 2) reports with offset 2.4V to the actual value to fit
+         * the input range of the ADC.  unit = 2.25mV = 9/4 mV.
+         */
+        val = DIV_ROUND_CLOSEST(val * 9, 4) + 2400;
+
+        return sprintf(buf, "%u\n", val);
+}
+
+static ssize_t mc13783_adc_read_gp(struct device *dev,
+                struct device_attribute *devattr, char *buf)
+{
+        unsigned val;
+        int ret = mc13783_adc_read(dev, devattr, &val);
+
+        if (ret)
+                return ret;
+
+        /*
+         * input range is [0, 2.3V], val has 10 bits, so each bit
+         * is worth 9/4 mV.
+         */
+        val = DIV_ROUND_CLOSEST(val * 9, 4);
+
+        return sprintf(buf, "%u\n", val);
+}
+
+static DEVICE_ATTR(name, S_IRUGO, mc13783_adc_show_name, NULL);
+static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, mc13783_adc_read_bp, NULL, 2);
+static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, mc13783_adc_read_gp, NULL, 5);
+static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, mc13783_adc_read_gp, NULL, 6);
+static SENSOR_DEVICE_ATTR(in7_input, S_IRUGO, mc13783_adc_read_gp, NULL, 7);
+static SENSOR_DEVICE_ATTR(in8_input, S_IRUGO, mc13783_adc_read_gp, NULL, 8);
+static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, mc13783_adc_read_gp, NULL, 9);
+static SENSOR_DEVICE_ATTR(in10_input, S_IRUGO, mc13783_adc_read_gp, NULL, 10);
+static SENSOR_DEVICE_ATTR(in11_input, S_IRUGO, mc13783_adc_read_gp, NULL, 11);
+static SENSOR_DEVICE_ATTR(in12_input, S_IRUGO, mc13783_adc_read_gp, NULL, 12);
+static SENSOR_DEVICE_ATTR(in13_input, S_IRUGO, mc13783_adc_read_gp, NULL, 13);
+static SENSOR_DEVICE_ATTR(in14_input, S_IRUGO, mc13783_adc_read_gp, NULL, 14);
+static SENSOR_DEVICE_ATTR(in15_input, S_IRUGO, mc13783_adc_read_gp, NULL, 15);
+
+static struct attribute *mc13783_attr[] = {
+        &dev_attr_name.attr,
+        &sensor_dev_attr_in2_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,
+        &sensor_dev_attr_in8_input.dev_attr.attr,
+        &sensor_dev_attr_in9_input.dev_attr.attr,
+        &sensor_dev_attr_in10_input.dev_attr.attr,
+        &sensor_dev_attr_in11_input.dev_attr.attr,
+        NULL
+};
+
+static const struct attribute_group mc13783_group = {
+        .attrs = mc13783_attr,
+};
+
+/* last four channels may be occupied by the touchscreen */
+static struct attribute *mc13783_attr_ts[] = {
+        &sensor_dev_attr_in12_input.dev_attr.attr,
+        &sensor_dev_attr_in13_input.dev_attr.attr,
+        &sensor_dev_attr_in14_input.dev_attr.attr,
+        &sensor_dev_attr_in15_input.dev_attr.attr,
+        NULL
+};
+
+static const struct attribute_group mc13783_group_ts = {
+        .attrs = mc13783_attr_ts,
+};
+
+static int __init mc13783_adc_probe(struct platform_device *pdev)
+{
+        struct mc13783_adc_priv *priv;
+        int ret;
+
+        priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+        if (!priv)
+                return -ENOMEM;
+
+        priv->mc13783 = dev_get_drvdata(pdev->dev.parent);
+
+        platform_set_drvdata(pdev, priv);
+
+        /* Register sysfs hooks */
+        ret = sysfs_create_group(&pdev->dev.kobj, &mc13783_group);
+        if (ret)
+                goto out_err_create1;
+
+        if (!(priv->mc13783->flags & MC13783_USE_TOUCHSCREEN))
+                ret = sysfs_create_group(&pdev->dev.kobj, &mc13783_group_ts);
+                if (ret)
+                        goto out_err_create2;
+
+        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_register;
+        }
+
+
+        return 0;
+
+out_err_register:
+
+        if (!(priv->mc13783->flags & MC13783_USE_TOUCHSCREEN))
+                sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_ts);
+out_err_create2:
+
+        sysfs_remove_group(&pdev->dev.kobj, &mc13783_group);
+out_err_create1:
+
+        platform_set_drvdata(pdev, NULL);
+        kfree(priv);
+
+        return ret;
+}
+
+static int __devexit mc13783_adc_remove(struct platform_device *pdev)
+{
+        struct mc13783_adc_priv *priv = platform_get_drvdata(pdev);
+
+        hwmon_device_unregister(priv->hwmon_dev);
+
+        if (!(priv->mc13783->flags & MC13783_USE_TOUCHSCREEN))
+                sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_ts);
+
+        sysfs_remove_group(&pdev->dev.kobj, &mc13783_group);
+
+        platform_set_drvdata(pdev, NULL);
+        kfree(priv);
+
+        return 0;
+}
+
+static struct platform_driver mc13783_adc_driver = {
+        .remove         = __devexit_p(mc13783_adc_remove),
+        .driver         = {
+                .owner  = THIS_MODULE,
+                .name   = MC13783_ADC_NAME,
+        },
+};
+
+static int __init mc13783_adc_init(void)
+{
+        return platform_driver_probe(&mc13783_adc_driver, mc13783_adc_probe);
+}
+
+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 ADC driver");
+MODULE_AUTHOR("Luotao Fu <l.fu@pengutronix.de>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" MC13783_ADC_NAME);