iio:adc: add iio driver for Palmas (twl6035/7) gpadc

This driver code was found as:

https://android.googlesource.com/kernel/tegra/+/aaabb2e045f31e5a970109ffdaae900dd403d17e/drivers/staging/iio/adc

Fixed various compilation issues and test this driver on omap5 evm.

Signed-off-by: Pradeep Goudagunta <pgoudagunta@nvidia.com>
Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
Signed-off-by: Marek Belisko <marek@goldelico.com>
Acked-by: Laxman Dewangan <ldewangan@nvidia.com>
Reviewed-by: Jonathan Cameron <jic23@kernel.org>
Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

1 files changed, 51 insertions, 24 deletions

diff --git a/include/linux/mfd/palmas.h b/include/linux/mfd/palmas.h
index 13e1d96935ed..c800dbc42079 100644
--- a/include/linux/mfd/palmas.h
+++ b/include/linux/mfd/palmas.h
@@ -134,21 +134,32 @@ struct palmas_pmic_driver_data {
                             struct regulator_config config);
 };
 
+struct palmas_adc_wakeup_property {
+        int adc_channel_number;
+        int adc_high_threshold;
+        int adc_low_threshold;
+};
+
 struct palmas_gpadc_platform_data {
         /* Channel 3 current source is only enabled during conversion */
-        int ch3_current;
+        int ch3_current;        /* 0: off; 1: 10uA; 2: 400uA; 3: 800 uA */
 
         /* Channel 0 current source can be used for battery detection.
          * If used for battery detection this will cause a permanent current
          * consumption depending on current level set here.
          */
-        int ch0_current;
+        int ch0_current;        /* 0: off; 1: 5uA; 2: 15uA; 3: 20 uA */
+        bool extended_delay;    /* use extended delay for conversion */
 
         /* default BAT_REMOVAL_DAT setting on device probe */
         int bat_removal;
 
         /* Sets the START_POLARITY bit in the RT_CTRL register */
         int start_polarity;
+
+        int auto_conversion_period_ms;
+        struct palmas_adc_wakeup_property *adc_wakeup1_data;
+        struct palmas_adc_wakeup_property *adc_wakeup2_data;
 };
 
 struct palmas_reg_init {
@@ -405,28 +416,7 @@ struct palmas_gpadc_calibration {
         s32 offset_error;
 };
 
-struct palmas_gpadc {
-        struct device *dev;
-        struct palmas *palmas;
-
-        int ch3_current;
-        int ch0_current;
-
-        int gpadc_force;
-
-        int bat_removal;
-
-        struct mutex reading_lock;
-        struct completion irq_complete;
-
-        int eoc_sw_irq;
-
-        struct palmas_gpadc_calibration *palmas_cal_tbl;
-
-        int conv0_channel;
-        int conv1_channel;
-        int rt_channel;
-};
+#define PALMAS_DATASHEET_NAME(_name)    "palmas-gpadc-chan-"#_name
 
 struct palmas_gpadc_result {
         s32 raw_code;
@@ -520,6 +510,43 @@ enum palmas_irqs {
         PALMAS_NUM_IRQ,
 };
 
+/* Palmas GPADC Channels */
+enum {
+        PALMAS_ADC_CH_IN0,
+        PALMAS_ADC_CH_IN1,
+        PALMAS_ADC_CH_IN2,
+        PALMAS_ADC_CH_IN3,
+        PALMAS_ADC_CH_IN4,
+        PALMAS_ADC_CH_IN5,
+        PALMAS_ADC_CH_IN6,
+        PALMAS_ADC_CH_IN7,
+        PALMAS_ADC_CH_IN8,
+        PALMAS_ADC_CH_IN9,
+        PALMAS_ADC_CH_IN10,
+        PALMAS_ADC_CH_IN11,
+        PALMAS_ADC_CH_IN12,
+        PALMAS_ADC_CH_IN13,
+        PALMAS_ADC_CH_IN14,
+        PALMAS_ADC_CH_IN15,
+        PALMAS_ADC_CH_MAX,
+};
+
+/* Palmas GPADC Channel0 Current Source */
+enum {
+        PALMAS_ADC_CH0_CURRENT_SRC_0,
+        PALMAS_ADC_CH0_CURRENT_SRC_5,
+        PALMAS_ADC_CH0_CURRENT_SRC_15,
+        PALMAS_ADC_CH0_CURRENT_SRC_20,
+};
+
+/* Palmas GPADC Channel3 Current Source */
+enum {
+        PALMAS_ADC_CH3_CURRENT_SRC_0,
+        PALMAS_ADC_CH3_CURRENT_SRC_10,
+        PALMAS_ADC_CH3_CURRENT_SRC_400,
+        PALMAS_ADC_CH3_CURRENT_SRC_800,
+};
+
 struct palmas_pmic {
         struct palmas *palmas;
         struct device *dev;