hwmon: Add Freescale MC13783 ADC driver
Luotao Fu [Wed, 9 Dec 2009 19:35:58 +0000 (20:35 +0100)]
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>

Documentation/hwmon/mc13783-adc [new file with mode: 0644]
drivers/hwmon/Kconfig
drivers/hwmon/Makefile
drivers/hwmon/mc13783-adc.c [new file with mode: 0644]

diff --git a/Documentation/hwmon/mc13783-adc b/Documentation/hwmon/mc13783-adc
new file mode 100644 (file)
index 0000000..044531a
--- /dev/null
@@ -0,0 +1,50 @@
+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
index 6e7c30b..dd69393 100644 (file)
@@ -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 A/D converter on MC13783 PMIC.
+
 if ACPI
 
 comment "ACPI drivers"
index a24a52d..33c2ee1 100644 (file)
@@ -74,6 +74,7 @@ obj-$(CONFIG_SENSORS_LTC4245) += ltc4245.o
 obj-$(CONFIG_SENSORS_MAX1111)  += max1111.o
 obj-$(CONFIG_SENSORS_MAX1619)  += max1619.o
 obj-$(CONFIG_SENSORS_MAX6650)  += max6650.o
+obj-$(CONFIG_SENSORS_MC13783_ADC)+= mc13783-adc.o
 obj-$(CONFIG_SENSORS_PC87360)  += pc87360.o
 obj-$(CONFIG_SENSORS_PC87427)  += pc87427.o
 obj-$(CONFIG_SENSORS_PCF8591)  += pcf8591.o
diff --git a/drivers/hwmon/mc13783-adc.c b/drivers/hwmon/mc13783-adc.c
new file mode 100644 (file)
index 0000000..883fa81
--- /dev/null
@@ -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);