--- /dev/null
+Kernel driver mc13783-adc
+=========================
+
+Supported chips:
+ * Freescale Atlas MC13783
+ Prefix: 'mc13783_adc'
+ Datasheet: http://www.freescale.com/files/rf_if/doc/data_sheet/MC13783.pdf?fsrch=1
+
+Authors:
+ Sascha Hauer <s.hauer@pengutronix.de>
+ Luotao Fu <l.fu@pengutronix.de>
+
+Description
+-----------
+
+The Freescale MC13783 is a Power Management and Audio Circuit. Among
+other things it contains a 10-bit A/D converter. The converter has 16
+channels which can be used in different modes.
+The A/D converter has a resolution of 2.25mV. Channels 0-4 have
+a dedicated meaning with chip internal scaling applied. Channels 5-7
+can be used as general purpose inputs or alternatively in a dedicated
+mode. Channels 12-15 are occupied by the touchscreen if it's active.
+
+Currently the driver only supports channels 2 and 5-15 with no alternative
+modes for channels 5-7.
+
+See this table for the meaning of the different channels and their chip
+internal scaling:
+
+Channel Signal Input Range Scaling
+-------------------------------------------------------------------------------
+0 Battery Voltage (BATT) 2.50 - 4.65V -2.40V
+1 Battery Current (BATT - BATTISNS) -50 - 50 mV x20
+2 Application Supply (BP) 2.50 - 4.65V -2.40V
+3 Charger Voltage (CHRGRAW) 0 - 10V / /5
+ 0 - 20V /10
+4 Charger Current (CHRGISNSP-CHRGISNSN) -0.25V - 0.25V x4
+5 General Purpose ADIN5 / Battery Pack Thermistor 0 - 2.30V No
+6 General Purpose ADIN6 / Backup Voltage (LICELL) 0 - 2.30V / No /
+ 1.50 - 3.50V -1.20V
+7 General Purpose ADIN7 / UID / Die Temperature 0 - 2.30V / No /
+ 0 - 2.55V / x0.9 / No
+8 General Purpose ADIN8 0 - 2.30V No
+9 General Purpose ADIN9 0 - 2.30V No
+10 General Purpose ADIN10 0 - 2.30V No
+11 General Purpose ADIN11 0 - 2.30V No
+12 General Purpose TSX1 / Touchscreen X-plate 1 0 - 2.30V No
+13 General Purpose TSX2 / Touchscreen X-plate 2 0 - 2.30V No
+14 General Purpose TSY1 / Touchscreen Y-plate 1 0 - 2.30V No
+15 General Purpose TSY2 / Touchscreen Y-plate 2 0 - 2.30V No
--- /dev/null
+/*
+ * 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);
projects / platform / kernel / kernel-mfld-blackbay.git / commitdiff