Merge branch 'ib-mfd-iio-3.19' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd into acpi-pmic

Pull MFD changes that the ACPI PMIC changes depend on from Lee Jones.

3 files changed, 270 insertions, 0 deletions

diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index 88bdc8f612e2..bc4e787096e8 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -127,6 +127,14 @@ config AT91_ADC
         help
           Say yes here to build support for Atmel AT91 ADC.
 
+config AXP288_ADC
+        tristate "X-Powers AXP288 ADC driver"
+        depends on MFD_AXP20X
+        help
+          Say yes here to have support for X-Powers power management IC (PMIC) ADC
+          device. Depending on platform configuration, this general purpose ADC can
+          be used for sampling sensors such as thermal resistors.
+
 config EXYNOS_ADC
         tristate "Exynos ADC driver support"
         depends on ARCH_EXYNOS || ARCH_S3C24XX || ARCH_S3C64XX || (OF && COMPILE_TEST)
diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
index cb88a6a23b8f..f30093f5b67a 100644
--- a/drivers/iio/adc/Makefile
+++ b/drivers/iio/adc/Makefile
@@ -14,6 +14,7 @@ obj-$(CONFIG_AD7793) += ad7793.o
 obj-$(CONFIG_AD7887) += ad7887.o
 obj-$(CONFIG_AD799X) += ad799x.o
 obj-$(CONFIG_AT91_ADC) += at91_adc.o
+obj-$(CONFIG_AXP288_ADC) += axp288_adc.o
 obj-$(CONFIG_EXYNOS_ADC) += exynos_adc.o
 obj-$(CONFIG_LP8788_ADC) += lp8788_adc.o
 obj-$(CONFIG_MAX1027) += max1027.o
diff --git a/drivers/iio/adc/axp288_adc.c b/drivers/iio/adc/axp288_adc.c
new file mode 100644
index 000000000000..08bcfb061ca5
--- /dev/null
+++ b/drivers/iio/adc/axp288_adc.c
@@ -0,0 +1,261 @@
+/*
+ * axp288_adc.c - X-Powers AXP288 PMIC ADC Driver
+ *
+ * Copyright (C) 2014 Intel Corporation
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * 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; version 2 of the License.
+ *
+ * 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.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/regmap.h>
+#include <linux/mfd/axp20x.h>
+#include <linux/platform_device.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/machine.h>
+#include <linux/iio/driver.h>
+
+#define AXP288_ADC_EN_MASK              0xF1
+#define AXP288_ADC_TS_PIN_GPADC         0xF2
+#define AXP288_ADC_TS_PIN_ON            0xF3
+
+enum axp288_adc_id {
+        AXP288_ADC_TS,
+        AXP288_ADC_PMIC,
+        AXP288_ADC_GP,
+        AXP288_ADC_BATT_CHRG_I,
+        AXP288_ADC_BATT_DISCHRG_I,
+        AXP288_ADC_BATT_V,
+        AXP288_ADC_NR_CHAN,
+};
+
+struct axp288_adc_info {
+        int irq;
+        struct regmap *regmap;
+};
+
+static const struct iio_chan_spec const axp288_adc_channels[] = {
+        {
+                .indexed = 1,
+                .type = IIO_TEMP,
+                .channel = 0,
+                .address = AXP288_TS_ADC_H,
+                .datasheet_name = "TS_PIN",
+        }, {
+                .indexed = 1,
+                .type = IIO_TEMP,
+                .channel = 1,
+                .address = AXP288_PMIC_ADC_H,
+                .datasheet_name = "PMIC_TEMP",
+        }, {
+                .indexed = 1,
+                .type = IIO_TEMP,
+                .channel = 2,
+                .address = AXP288_GP_ADC_H,
+                .datasheet_name = "GPADC",
+        }, {
+                .indexed = 1,
+                .type = IIO_CURRENT,
+                .channel = 3,
+                .address = AXP20X_BATT_CHRG_I_H,
+                .datasheet_name = "BATT_CHG_I",
+                .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
+        }, {
+                .indexed = 1,
+                .type = IIO_CURRENT,
+                .channel = 4,
+                .address = AXP20X_BATT_DISCHRG_I_H,
+                .datasheet_name = "BATT_DISCHRG_I",
+                .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
+        }, {
+                .indexed = 1,
+                .type = IIO_VOLTAGE,
+                .channel = 5,
+                .address = AXP20X_BATT_V_H,
+                .datasheet_name = "BATT_V",
+                .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
+        },
+};
+
+#define AXP288_ADC_MAP(_adc_channel_label, _consumer_dev_name,  \
+                _consumer_channel)                              \
+        {                                                       \
+                .adc_channel_label = _adc_channel_label,        \
+                .consumer_dev_name = _consumer_dev_name,        \
+                .consumer_channel = _consumer_channel,          \
+        }
+
+/* for consumer drivers */
+static struct iio_map axp288_adc_default_maps[] = {
+        AXP288_ADC_MAP("TS_PIN", "axp288-batt", "axp288-batt-temp"),
+        AXP288_ADC_MAP("PMIC_TEMP", "axp288-pmic", "axp288-pmic-temp"),
+        AXP288_ADC_MAP("GPADC", "axp288-gpadc", "axp288-system-temp"),
+        AXP288_ADC_MAP("BATT_CHG_I", "axp288-chrg", "axp288-chrg-curr"),
+        AXP288_ADC_MAP("BATT_DISCHRG_I", "axp288-chrg", "axp288-chrg-d-curr"),
+        AXP288_ADC_MAP("BATT_V", "axp288-batt", "axp288-batt-volt"),
+        {},
+};
+
+static int axp288_adc_read_channel(int *val, unsigned long address,
+                                struct regmap *regmap)
+{
+        u8 buf[2];
+
+        if (regmap_bulk_read(regmap, address, buf, 2))
+                return -EIO;
+        *val = (buf[0] << 4) + ((buf[1] >> 4) & 0x0F);
+
+        return IIO_VAL_INT;
+}
+
+static int axp288_adc_set_ts(struct regmap *regmap, unsigned int mode,
+                                unsigned long address)
+{
+        /* channels other than GPADC do not need to switch TS pin */
+        if (address != AXP288_GP_ADC_H)
+                return 0;
+
+        return regmap_write(regmap, AXP288_ADC_TS_PIN_CTRL, mode);
+}
+
+static int axp288_adc_read_raw(struct iio_dev *indio_dev,
+                        struct iio_chan_spec const *chan,
+                        int *val, int *val2, long mask)
+{
+        int ret;
+        struct axp288_adc_info *info = iio_priv(indio_dev);
+
+        mutex_lock(&indio_dev->mlock);
+        switch (mask) {
+        case IIO_CHAN_INFO_RAW:
+                if (axp288_adc_set_ts(info->regmap, AXP288_ADC_TS_PIN_GPADC,
+                                        chan->address)) {
+                        dev_err(&indio_dev->dev, "GPADC mode\n");
+                        ret = -EINVAL;
+                        break;
+                }
+                ret = axp288_adc_read_channel(val, chan->address, info->regmap);
+                if (axp288_adc_set_ts(info->regmap, AXP288_ADC_TS_PIN_ON,
+                                                chan->address))
+                        dev_err(&indio_dev->dev, "TS pin restore\n");
+                break;
+        case IIO_CHAN_INFO_PROCESSED:
+                ret = axp288_adc_read_channel(val, chan->address, info->regmap);
+                break;
+        default:
+                ret = -EINVAL;
+        }
+        mutex_unlock(&indio_dev->mlock);
+
+        return ret;
+}
+
+static int axp288_adc_set_state(struct regmap *regmap)
+{
+        /* ADC should be always enabled for internal FG to function */
+        if (regmap_write(regmap, AXP288_ADC_TS_PIN_CTRL, AXP288_ADC_TS_PIN_ON))
+                return -EIO;
+
+        return regmap_write(regmap, AXP20X_ADC_EN1, AXP288_ADC_EN_MASK);
+}
+
+static const struct iio_info axp288_adc_iio_info = {
+        .read_raw = &axp288_adc_read_raw,
+        .driver_module = THIS_MODULE,
+};
+
+static int axp288_adc_probe(struct platform_device *pdev)
+{
+        int ret;
+        struct axp288_adc_info *info;
+        struct iio_dev *indio_dev;
+        struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
+
+        indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*info));
+        if (!indio_dev)
+                return -ENOMEM;
+
+        info = iio_priv(indio_dev);
+        info->irq = platform_get_irq(pdev, 0);
+        if (info->irq < 0) {
+                dev_err(&pdev->dev, "no irq resource?\n");
+                return info->irq;
+        }
+        platform_set_drvdata(pdev, indio_dev);
+        info->regmap = axp20x->regmap;
+        /*
+         * Set ADC to enabled state at all time, including system suspend.
+         * otherwise internal fuel gauge functionality may be affected.
+         */
+        ret = axp288_adc_set_state(axp20x->regmap);
+        if (ret) {
+                dev_err(&pdev->dev, "unable to enable ADC device\n");
+                return ret;
+        }
+
+        indio_dev->dev.parent = &pdev->dev;
+        indio_dev->name = pdev->name;
+        indio_dev->channels = axp288_adc_channels;
+        indio_dev->num_channels = ARRAY_SIZE(axp288_adc_channels);
+        indio_dev->info = &axp288_adc_iio_info;
+        indio_dev->modes = INDIO_DIRECT_MODE;
+        ret = iio_map_array_register(indio_dev, axp288_adc_default_maps);
+        if (ret < 0)
+                return ret;
+
+        ret = iio_device_register(indio_dev);
+        if (ret < 0) {
+                dev_err(&pdev->dev, "unable to register iio device\n");
+                goto err_array_unregister;
+        }
+        return 0;
+
+err_array_unregister:
+        iio_map_array_unregister(indio_dev);
+
+        return ret;
+}
+
+static int axp288_adc_remove(struct platform_device *pdev)
+{
+        struct iio_dev *indio_dev = platform_get_drvdata(pdev);
+
+        iio_device_unregister(indio_dev);
+        iio_map_array_unregister(indio_dev);
+
+        return 0;
+}
+
+static struct platform_device_id axp288_adc_id_table[] = {
+        { .name = "axp288_adc" },
+        {},
+};
+
+static struct platform_driver axp288_adc_driver = {
+        .probe = axp288_adc_probe,
+        .remove = axp288_adc_remove,
+        .id_table = axp288_adc_id_table,
+        .driver = {
+                .name = "axp288_adc",
+        },
+};
+
+MODULE_DEVICE_TABLE(platform, axp288_adc_id_table);
+
+module_platform_driver(axp288_adc_driver);
+
+MODULE_AUTHOR("Jacob Pan <jacob.jun.pan@linux.intel.com>");
+MODULE_DESCRIPTION("X-Powers AXP288 ADC Driver");
+MODULE_LICENSE("GPL");