arm: tegra: loki: Batt temp and tdiode shutdown

This change enables reading the battery temperature and
Tdiode through PMIC ADC and shutdown based on that.
The adc value conversion to temperature
is performed using a look-up table that maps the adc values
to temp. The conversion table is based on values generated
for Loki P2530 board.

Bug 1408758
Bug 1398960

Change-Id: Ic27efe4f7b608ee355799c9498413a862dd4ea39
Signed-off-by: Ankita Garg <ankitag@nvidia.com>
Signed-off-by: Anshul Jain <anshulj@nvidia.com>
Reviewed-on: http://git-master/r/375907
Reviewed-by: Diwakar Tundlam <dtundlam@nvidia.com>
Tested-by: Diwakar Tundlam <dtundlam@nvidia.com>

1 files changed, 50 insertions, 1 deletions

diff --git a/arch/arm/mach-tegra/board-loki-power.c b/arch/arm/mach-tegra/board-loki-power.c
index 31409c05aa2d..6a72aaf53384 100644
--- a/arch/arm/mach-tegra/board-loki-power.c
+++ b/arch/arm/mach-tegra/board-loki-power.c
@@ -368,11 +368,36 @@ static struct palmas_reg_init *loki_reg_init[PALMAS_NUM_REGS] = {
 };
 
 static struct iio_map palmas_adc_iio_maps[] = {
+	PALMAS_GPADC_IIO_MAP(NULL, NULL, NULL),
+};
+
+static struct iio_map palmas_adc_iio_maps_p2530_loki[] = {
+	PALMAS_GPADC_IIO_MAP(IN1, "generic-adc-thermal.0", "thermistor"),
+	PALMAS_GPADC_IIO_MAP(IN3, "generic-adc-thermal.1", "tdiode"),
+	PALMAS_GPADC_IIO_MAP(IN4, "generic-adc-thermal.2", "tbat"),
+	PALMAS_GPADC_IIO_MAP(NULL, NULL, NULL),
+};
+
+static struct iio_map palmas_adc_iio_maps_p2530_foster[] = {
 	PALMAS_GPADC_IIO_MAP(IN1, "generic-adc-thermal.0", "thermistor"),
 	PALMAS_GPADC_IIO_MAP(IN3, "generic-adc-thermal.1", "tdiode"),
 	PALMAS_GPADC_IIO_MAP(NULL, NULL, NULL),
 };
 
+struct palmas_adc_auto_conv_property palmas_adc_auto_conv0_data = {
+	.adc_channel_number = PALMAS_ADC_CH_IN3, /* Tdiode */
+	/* Shutdown if ADC auto conversion is below 1487(>100C). */
+	.adc_low_threshold = 1487, /* 100C */
+	.adc_shutdown = true,
+};
+
+struct palmas_adc_auto_conv_property palmas_adc_auto_conv1_data = {
+	.adc_channel_number = PALMAS_ADC_CH_IN4, /* Tbat */
+	/* Shutdown if ADC auto conversion is below 748(>70C). */
+	.adc_low_threshold = 748, /* 70C */
+	.adc_shutdown = true,
+};
+
 static struct palmas_gpadc_platform_data palmas_adc_pdata = {
 	/* If ch3_dual_current is true, it will measure ch3 input signal with
 	 * ch3_current and the next current of ch3_current.
@@ -767,9 +792,32 @@ int __init loki_regulator_init(void)
 	reg_idata_smps123.constraints.init_uV = 1000000;
 	reg_idata_smps9.constraints.enable_time = 250;
 
+	tegra_get_board_info(&bi);
+
+	if (bi.board_id == BOARD_P2530 && bi.fab >= 0xa1) {
+
+		palmas_adc_pdata.auto_conversion_period_ms = 1000;
+		palmas_adc_pdata.adc_auto_conv0_data =
+					&palmas_adc_auto_conv0_data;
+
+		if (bi.sku == BOARD_SKU_FOSTER) {
+			pr_info("thermal: registering for foster\n");
+			palmas_adc_pdata.iio_maps =
+				palmas_adc_iio_maps_p2530_foster;
+		} else if (bi.sku == BOARD_SKU_100 || bi.sku == BOARD_SKU_0) {
+			pr_info("thermal: registering for loki\n");
+			palmas_adc_pdata.iio_maps =
+				palmas_adc_iio_maps_p2530_loki;
+			palmas_adc_pdata.adc_auto_conv1_data =
+					&palmas_adc_auto_conv1_data;
+		} else {
+			pr_err("palmas: Not a known SKU!\n");
+		}
+	}
+
+
 	i2c_register_board_info(4, palma_device,
 			ARRAY_SIZE(palma_device));
-	tegra_get_board_info(&bi);
 	if (bi.board_id == BOARD_P2530 && bi.fab >= 0xa1) {
 		pmic_platform.reg_data[PALMAS_REG_SMPS7] =
 			PALMAS_REG_PDATA(smps7_a01);
@@ -784,6 +832,7 @@ int __init loki_regulator_init(void)
 		pmic_platform.reg_init[PALMAS_REG_LDO5] =
 			PALMAS_REG_INIT_DATA(ldo5_a01);
 	}
+
 	platform_device_register(&power_supply_extcon_device);
 
 	loki_cl_dvfs_init();