4 files changed, 213 insertions, 0 deletions

diff --git a/Documentation/hwmon/twl4030-madc-hwmon b/Documentation/hwmon/twl4030-madc-hwmon
new file mode 100644
index 000000000000..ef7984317cec
--- /dev/null
+++ b/Documentation/hwmon/twl4030-madc-hwmon
@@ -0,0 +1,45 @@
+Kernel driver twl4030-madc
+=========================
+
+Supported chips:
+        * Texas Instruments TWL4030
+        Prefix: 'twl4030-madc'
+
+
+Authors:
+        J Keerthy <j-keerthy@ti.com>
+
+Description
+-----------
+
+The Texas Instruments TWL4030 is a Power Management and Audio Circuit. Among
+other things it contains a 10-bit A/D converter MADC. The converter has 16
+channels which can be used in different modes.
+
+
+See this table for the meaning of the different channels
+
+Channel Signal
+------------------------------------------
+0       Battery type(BTYPE)
+1       BCI: Battery temperature (BTEMP)
+2       GP analog input
+3       GP analog input
+4       GP analog input
+5       GP analog input
+6       GP analog input
+7       GP analog input
+8       BCI: VBUS voltage(VBUS)
+9       Backup Battery voltage (VBKP)
+10      BCI: Battery charger current (ICHG)
+11      BCI: Battery charger voltage (VCHG)
+12      BCI: Main battery voltage (VBAT)
+13      Reserved
+14      Reserved
+15      VRUSB Supply/Speaker left/Speaker right polarization level
+
+
+The Sysfs nodes will represent the voltage in the units of mV,
+the temperature channel shows the converted temperature in
+degree celcius. The Battery charging current channel represents
+battery charging current in mA.
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index e4bd13b3cd8b..81131eda5544 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -1047,6 +1047,16 @@ config SENSORS_TMP421
           This driver can also be built as a module.  If so, the module
           will be called tmp421.
 
+config SENSORS_TWL4030_MADC
+        tristate "Texas Instruments TWL4030 MADC Hwmon"
+        depends on TWL4030_MADC
+        help
+        If you say yes here you get hwmon support for triton
+        TWL4030-MADC.
+
+        This driver can also be built as a module. If so it will be called
+        twl4030-madc-hwmon.
+
 config SENSORS_VIA_CPUTEMP
         tristate "VIA CPU temperature sensor"
         depends on X86
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 54ca5939d028..967d0ea9447f 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -104,6 +104,7 @@ obj-$(CONFIG_SENSORS_THMC50)	+= thmc50.o
 obj-$(CONFIG_SENSORS_TMP102)    += tmp102.o
 obj-$(CONFIG_SENSORS_TMP401)    += tmp401.o
 obj-$(CONFIG_SENSORS_TMP421)    += tmp421.o
+obj-$(CONFIG_SENSORS_TWL4030_MADC)+= twl4030-madc-hwmon.o
 obj-$(CONFIG_SENSORS_VIA_CPUTEMP)+= via-cputemp.o
 obj-$(CONFIG_SENSORS_VIA686A)   += via686a.o
 obj-$(CONFIG_SENSORS_VT1211)    += vt1211.o
diff --git a/drivers/hwmon/twl4030-madc-hwmon.c b/drivers/hwmon/twl4030-madc-hwmon.c
new file mode 100644
index 000000000000..97e22bef85ab
--- /dev/null
+++ b/drivers/hwmon/twl4030-madc-hwmon.c
@@ -0,0 +1,157 @@
+/*
+ *
+ * TWL4030 MADC Hwmon driver-This driver monitors the real time
+ * conversion of analog signals like battery temperature,
+ * battery type, battery level etc. User can ask for the conversion on a
+ * particular channel using the sysfs nodes.
+ *
+ * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
+ * J Keerthy <j-keerthy@ti.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 published by the Free Software Foundation.
+ *
+ * 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/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/i2c/twl.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/i2c/twl4030-madc.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/stddef.h>
+#include <linux/sysfs.h>
+#include <linux/err.h>
+#include <linux/types.h>
+
+/*
+ * sysfs hook function
+ */
+static ssize_t madc_read(struct device *dev,
+                         struct device_attribute *devattr, char *buf)
+{
+        struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+        struct twl4030_madc_request req;
+        long val;
+
+        req.channels = (1 << attr->index);
+        req.method = TWL4030_MADC_SW2;
+        req.func_cb = NULL;
+        val = twl4030_madc_conversion(&req);
+        if (val < 0)
+                return val;
+
+        return sprintf(buf, "%d\n", req.rbuf[attr->index]);
+}
+
+/* sysfs nodes to read individual channels from user side */
+static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, madc_read, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, madc_read, NULL, 1);
+static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, madc_read, NULL, 2);
+static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, madc_read, NULL, 3);
+static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, madc_read, NULL, 4);
+static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, madc_read, NULL, 5);
+static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, madc_read, NULL, 6);
+static SENSOR_DEVICE_ATTR(in7_input, S_IRUGO, madc_read, NULL, 7);
+static SENSOR_DEVICE_ATTR(in8_input, S_IRUGO, madc_read, NULL, 8);
+static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, madc_read, NULL, 9);
+static SENSOR_DEVICE_ATTR(curr10_input, S_IRUGO, madc_read, NULL, 10);
+static SENSOR_DEVICE_ATTR(in11_input, S_IRUGO, madc_read, NULL, 11);
+static SENSOR_DEVICE_ATTR(in12_input, S_IRUGO, madc_read, NULL, 12);
+static SENSOR_DEVICE_ATTR(in15_input, S_IRUGO, madc_read, NULL, 15);
+
+static struct attribute *twl4030_madc_attributes[] = {
+        &sensor_dev_attr_in0_input.dev_attr.attr,
+        &sensor_dev_attr_temp1_input.dev_attr.attr,
+        &sensor_dev_attr_in2_input.dev_attr.attr,
+        &sensor_dev_attr_in3_input.dev_attr.attr,
+        &sensor_dev_attr_in4_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_curr10_input.dev_attr.attr,
+        &sensor_dev_attr_in11_input.dev_attr.attr,
+        &sensor_dev_attr_in12_input.dev_attr.attr,
+        &sensor_dev_attr_in15_input.dev_attr.attr,
+        NULL
+};
+
+static const struct attribute_group twl4030_madc_group = {
+        .attrs = twl4030_madc_attributes,
+};
+
+static int __devinit twl4030_madc_hwmon_probe(struct platform_device *pdev)
+{
+        int ret;
+        int status;
+        struct device *hwmon;
+
+        ret = sysfs_create_group(&pdev->dev.kobj, &twl4030_madc_group);
+        if (ret)
+                goto err_sysfs;
+        hwmon = hwmon_device_register(&pdev->dev);
+        if (IS_ERR(hwmon)) {
+                dev_err(&pdev->dev, "hwmon_device_register failed.\n");
+                status = PTR_ERR(hwmon);
+                goto err_reg;
+        }
+
+        return 0;
+
+err_reg:
+        sysfs_remove_group(&pdev->dev.kobj, &twl4030_madc_group);
+err_sysfs:
+
+        return ret;
+}
+
+static int __devexit twl4030_madc_hwmon_remove(struct platform_device *pdev)
+{
+        hwmon_device_unregister(&pdev->dev);
+        sysfs_remove_group(&pdev->dev.kobj, &twl4030_madc_group);
+
+        return 0;
+}
+
+static struct platform_driver twl4030_madc_hwmon_driver = {
+        .probe = twl4030_madc_hwmon_probe,
+        .remove = __exit_p(twl4030_madc_hwmon_remove),
+        .driver = {
+                   .name = "twl4030_madc_hwmon",
+                   .owner = THIS_MODULE,
+                   },
+};
+
+static int __init twl4030_madc_hwmon_init(void)
+{
+        return platform_driver_register(&twl4030_madc_hwmon_driver);
+}
+
+module_init(twl4030_madc_hwmon_init);
+
+static void __exit twl4030_madc_hwmon_exit(void)
+{
+        platform_driver_unregister(&twl4030_madc_hwmon_driver);
+}
+
+module_exit(twl4030_madc_hwmon_exit);
+
+MODULE_DESCRIPTION("TWL4030 ADC Hwmon driver");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("J Keerthy");
+MODULE_ALIAS("twl4030_madc_hwmon");