The GPADC is general purpose ADC found on TWL6030, and TWL6032 PMIC,
known also as Phoenix and PhoenixLite.
The TWL6030 and TWL6032 have GPADC with 17 and 19 channels
respectively. Some channels have current source and are used for
measuring voltage drop on resistive load for detecting battery ID
resistance, or measuring voltage drop on NTC resistors for external
temperature measurements. Some channels measure voltage, (i.e. battery
voltage), and have voltage dividers, thus, capable to scale voltage.
Some channels are dedicated for measuring die temperature.
Some channels are calibrated in 2 points, having offsets from ideal
values kept in trim registers. This is used to correct measurements.
The differences between GPADC in TWL6030 and TWL6032:
- 10 bit vs 12 bit ADC;
- 17 vs 19 channels;
- channels have different purpose(i.e. battery voltage
channel 8 vs channel 18);
- trim values are interpreted differently.
Based on the driver patched from Balaji TK, Graeme Gregory, Ambresh K,
Girish S Ghongdemath.
Signed-off-by: Balaji T K balaj...@ti.com
Signed-off-by: Graeme Gregory g...@slimlogic.co.uk
Signed-off-by: Oleksandr Kozaruk oleksandr.koza...@ti.com
---
drivers/iio/adc/Kconfig | 14 +
drivers/iio/adc/Makefile|1 +
drivers/iio/adc/twl6030-gpadc.c | 1008 +++
3 files changed, 1023 insertions(+)
create mode 100644 drivers/iio/adc/twl6030-gpadc.c
diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index ab0767e6..3172461 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -150,6 +150,20 @@ config TI_AM335X_ADC
Say yes here to build support for Texas Instruments ADC
driver which is also a MFD client.
+config TWL6030_GPADC
+ tristate TWL6030 GPADC (General Purpose A/D Converter) Support
+ depends on TWL4030_CORE
+ default n
+ help
+ Say yes here if you want support for the TWL6030/TWL6032 General
+ Purpose A/D Converter. This will add support for battery type
+ detection, battery voltage and temperature measurement, die
+ temperature measurement, system supply voltage, audio accessory,
+ USB ID detection.
+
+ This driver can also be built as a module. If so, the module will be
+ called twl6030-gpadc.
+
config VIPERBOARD_ADC
tristate Viperboard ADC support
depends on MFD_VIPERBOARD USB
diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
index 0a825be..996ba09 100644
--- a/drivers/iio/adc/Makefile
+++ b/drivers/iio/adc/Makefile
@@ -16,4 +16,5 @@ obj-$(CONFIG_LP8788_ADC) += lp8788_adc.o
obj-$(CONFIG_MAX1363) += max1363.o
obj-$(CONFIG_TI_ADC081C) += ti-adc081c.o
obj-$(CONFIG_TI_AM335X_ADC) += ti_am335x_adc.o
+obj-$(CONFIG_TWL6030_GPADC) += twl6030-gpadc.o
obj-$(CONFIG_VIPERBOARD_ADC) += viperboard_adc.o
diff --git a/drivers/iio/adc/twl6030-gpadc.c b/drivers/iio/adc/twl6030-gpadc.c
new file mode 100644
index 000..658f35b
--- /dev/null
+++ b/drivers/iio/adc/twl6030-gpadc.c
@@ -0,0 +1,1008 @@
+/*
+ * TWL6030 GPADC module driver
+ *
+ * Copyright (C) 2009-2013 Texas Instruments Inc.
+ * Nishant Kamat nska...@ti.com
+ * Balaji T K balaj...@ti.com
+ * Graeme Gregory g...@slimlogic.co.uk
+ * Girish S Ghongdemath giris...@ti.com
+ * Ambresh K ambr...@ti.com
+ * Oleksandr Kozaruk oleksandr.koza...@ti.com
+ *
+ * Based on twl4030-madc.c
+ * Copyright (C) 2008 Nokia Corporation
+ * Mikko Ylinen mikko.k.yli...@nokia.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/interrupt.h
+#include linux/kernel.h
+#include linux/module.h
+#include linux/platform_device.h
+#include linux/of_platform.h
+#include linux/i2c/twl.h
+#include linux/iio/iio.h
+#include linux/iio/sysfs.h
+
+#define DRIVER_NAMEtwl6030_gpadc
+
+#define TWL6030_GPADC_MAX_CHANNELS 17
+#define TWL6032_GPADC_MAX_CHANNELS 19
+
+#define TWL6030_GPADC_CTRL_P1 0x05
+
+#define TWL6032_GPADC_GPSELECT_ISB 0x07
+#define TWL6032_GPADC_CTRL_P1 0x08
+
+#define TWL6032_GPADC_GPCH0_LSB0x0d
+#define TWL6032_GPADC_GPCH0_MSB0x0e
+
+#define TWL6030_GPADC_CTRL_P1_SP1 BIT(3)
+
+#define TWL6030_GPADC_GPCH0_LSB(0x29)
+
+#define TWL6030_GPADC_RT_SW1_EOC_MASK
