[PATCH v2 3/4] mfd: add support for Allwinner SoCs ADC

From: Quentin Schulz
Date: Fri Jul 15 2016 - 06:01:31 EST

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The Allwinner SoCs all have an ADC that can also act as a touchscreen
controller and a thermal sensor. For now, only the ADC and the thermal
sensor drivers are probed by the MFD, the touchscreen controller support
will be added later.

Signed-off-by: Quentin Schulz <quentin.schulz@xxxxxxxxxxxxxxxxxx>
---

v2:
- add license headers,
- reorder alphabetically includes,
- add SUNXI_GPADC_ prefixes for defines,

drivers/mfd/Kconfig | 14 +++
drivers/mfd/Makefile | 2 +
drivers/mfd/sunxi-gpadc-mfd.c | 197 ++++++++++++++++++++++++++++++++++++
include/linux/mfd/sunxi-gpadc-mfd.h | 23 +++++
4 files changed, 236 insertions(+)
create mode 100644 drivers/mfd/sunxi-gpadc-mfd.c
create mode 100644 include/linux/mfd/sunxi-gpadc-mfd.h

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 1bcf601..67b55d0 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -82,6 +82,20 @@ config MFD_ATMEL_FLEXCOM
by the probe function of this MFD driver according to a device tree
property.

+config MFD_SUNXI_ADC
+ tristate "ADC MFD core driver for sunxi platforms"
+ select MFD_CORE
+ select REGMAP_MMIO
+ help
+ Select this to get support for Allwinner SoCs (A10, A13 and A31) ADC.
+ This driver will only map the hardware interrupt and registers, you
+ have to select individual drivers based on this MFD to be able to use
+ the ADC or the thermal sensor. This will try to probe the ADC driver
+ sunxi-gpadc-iio and the hwmon driver iio_hwmon.
+
+ To compile this driver as a module, choose M here: the
+ module will be called sunxi-gpadc-mfd.
+
config MFD_ATMEL_HLCDC
tristate "Atmel HLCDC (High-end LCD Controller)"
select MFD_CORE
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 42a66e1..dcf43cd 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -201,6 +201,8 @@ obj-$(CONFIG_MFD_DLN2) += dln2.o
obj-$(CONFIG_MFD_RT5033) += rt5033.o
obj-$(CONFIG_MFD_SKY81452) += sky81452.o

+obj-$(CONFIG_MFD_SUNXI_ADC) += sunxi-gpadc-mfd.o
+
intel-soc-pmic-objs := intel_soc_pmic_core.o intel_soc_pmic_crc.o
intel-soc-pmic-$(CONFIG_INTEL_PMC_IPC) += intel_soc_pmic_bxtwc.o
obj-$(CONFIG_INTEL_SOC_PMIC) += intel-soc-pmic.o
diff --git a/drivers/mfd/sunxi-gpadc-mfd.c b/drivers/mfd/sunxi-gpadc-mfd.c
new file mode 100644
index 0000000..f0005a6
--- /dev/null
+++ b/drivers/mfd/sunxi-gpadc-mfd.c
@@ -0,0 +1,197 @@
+/* ADC MFD core driver for sunxi platforms
+ *
+ * Copyright (c) 2016 Quentin Schulz <quentin.schulz@free-electrons>
+ *
+ * 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.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/mfd/core.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/regmap.h>
+
+#include <linux/mfd/sunxi-gpadc-mfd.h>
+
+#define SUNXI_IRQ_FIFO_DATA 0
+#define SUNXI_IRQ_TEMP_DATA 1
+
+static struct resource adc_resources[] = {
+ {
+ .name = "FIFO_DATA_PENDING",
+ .start = SUNXI_IRQ_FIFO_DATA,
+ .end = SUNXI_IRQ_FIFO_DATA,
+ .flags = IORESOURCE_IRQ,
+ }, {
+ .name = "TEMP_DATA_PENDING",
+ .start = SUNXI_IRQ_TEMP_DATA,
+ .end = SUNXI_IRQ_TEMP_DATA,
+ .flags = IORESOURCE_IRQ,
+ },
+};
+
+static const struct regmap_irq sunxi_gpadc_mfd_regmap_irq[] = {
+ REGMAP_IRQ_REG(SUNXI_IRQ_FIFO_DATA, 0, BIT(16)),
+ REGMAP_IRQ_REG(SUNXI_IRQ_TEMP_DATA, 0, BIT(18)),
+};
+
+static const struct regmap_irq_chip sunxi_gpadc_mfd_regmap_irq_chip = {
+ .name = "sunxi_gpadc_mfd_irq_chip",
+ .status_base = SUNXI_GPADC_TP_INT_FIFOS,
+ .ack_base = SUNXI_GPADC_TP_INT_FIFOS,
+ .mask_base = SUNXI_GPADC_TP_INT_FIFOC,
+ .init_ack_masked = true,
+ .mask_invert = true,
+ .irqs = sunxi_gpadc_mfd_regmap_irq,
+ .num_irqs = ARRAY_SIZE(sunxi_gpadc_mfd_regmap_irq),
+ .num_regs = 1,
+};
+
+static struct mfd_cell sun4i_gpadc_mfd_cells[] = {
+ {
+ .name = "sun4i-a10-gpadc-iio",
+ .resources = adc_resources,
+ .num_resources = ARRAY_SIZE(adc_resources),
+ }, {
+ .name = "iio_hwmon",
+ }
+};
+
+static struct mfd_cell sun5i_gpadc_mfd_cells[] = {
+ {
+ .name = "sun5i-a13-gpadc-iio",
+ .resources = adc_resources,
+ .num_resources = ARRAY_SIZE(adc_resources),
+ }, {
+ .name = "iio_hwmon",
+ },
+};
+
+static struct mfd_cell sun6i_gpadc_mfd_cells[] = {
+ {
+ .name = "sun6i-a31-gpadc-iio",
+ .resources = adc_resources,
+ .num_resources = ARRAY_SIZE(adc_resources),
+ }, {
+ .name = "iio_hwmon",
+ },
+};
+
+static const struct regmap_config sunxi_gpadc_mfd_regmap_config = {
+ .reg_bits = 32,
+ .val_bits = 32,
+ .reg_stride = 4,
+ .fast_io = true,
+};
+
+static int sunxi_gpadc_mfd_probe(struct platform_device *pdev)
+{
+ struct sunxi_gpadc_mfd_dev *sunxi_gpadc_mfd_dev = NULL;
+ struct resource *mem = NULL;
+ unsigned int irq;
+ int ret;
+
+ sunxi_gpadc_mfd_dev = devm_kzalloc(&pdev->dev,
+ sizeof(*sunxi_gpadc_mfd_dev),
+ GFP_KERNEL);
+ if (!sunxi_gpadc_mfd_dev)
+ return -ENOMEM;
+
+ mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ sunxi_gpadc_mfd_dev->regs = devm_ioremap_resource(&pdev->dev, mem);
+ if (IS_ERR(sunxi_gpadc_mfd_dev->regs))
+ return PTR_ERR(sunxi_gpadc_mfd_dev->regs);
+
+ sunxi_gpadc_mfd_dev->dev = &pdev->dev;
+ dev_set_drvdata(sunxi_gpadc_mfd_dev->dev, sunxi_gpadc_mfd_dev);
+
+ sunxi_gpadc_mfd_dev->regmap =
+ devm_regmap_init_mmio(sunxi_gpadc_mfd_dev->dev,
+ sunxi_gpadc_mfd_dev->regs,
+ &sunxi_gpadc_mfd_regmap_config);
+ if (IS_ERR(sunxi_gpadc_mfd_dev->regmap)) {
+ ret = PTR_ERR(sunxi_gpadc_mfd_dev->regmap);
+ dev_err(&pdev->dev, "failed to init regmap: %d\n", ret);
+ return ret;
+ }
+
+ irq = platform_get_irq(pdev, 0);
+ ret = regmap_add_irq_chip(sunxi_gpadc_mfd_dev->regmap, irq,
+ IRQF_ONESHOT, 0,
+ &sunxi_gpadc_mfd_regmap_irq_chip,
+ &sunxi_gpadc_mfd_dev->regmap_irqc);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to add irq chip: %d\n", ret);
+ return ret;
+ }
+
+ if (of_device_is_compatible(pdev->dev.of_node,
+ "allwinner,sun4i-a10-ts"))
+ ret = mfd_add_devices(sunxi_gpadc_mfd_dev->dev, 0,
+ sun4i_gpadc_mfd_cells,
+ ARRAY_SIZE(sun4i_gpadc_mfd_cells), NULL,
+ 0, NULL);
+ else if (of_device_is_compatible(pdev->dev.of_node,
+ "allwinner,sun5i-a13-ts"))
+ ret = mfd_add_devices(sunxi_gpadc_mfd_dev->dev, 0,
+ sun5i_gpadc_mfd_cells,
+ ARRAY_SIZE(sun5i_gpadc_mfd_cells), NULL,
+ 0, NULL);
+ else if (of_device_is_compatible(pdev->dev.of_node,
+ "allwinner,sun6i-a31-ts"))
+ ret = mfd_add_devices(sunxi_gpadc_mfd_dev->dev, 0,
+ sun6i_gpadc_mfd_cells,
+ ARRAY_SIZE(sun6i_gpadc_mfd_cells), NULL,
+ 0, NULL);
+
+ if (ret) {
+ dev_err(&pdev->dev, "failed to add MFD devices: %d\n", ret);
+ regmap_del_irq_chip(irq, sunxi_gpadc_mfd_dev->regmap_irqc);
+ return ret;
+ }
+
+ dev_info(&pdev->dev, "successfully loaded\n");
+
+ return 0;
+}
+
+static int sunxi_gpadc_mfd_remove(struct platform_device *pdev)
+{
+ struct sunxi_gpadc_mfd_dev *sunxi_gpadc_mfd_dev;
+ unsigned int irq;
+
+ irq = platform_get_irq(pdev, 0);
+ mfd_remove_devices(&pdev->dev);
+ sunxi_gpadc_mfd_dev = dev_get_drvdata(&pdev->dev);
+ regmap_del_irq_chip(irq, sunxi_gpadc_mfd_dev->regmap_irqc);
+
+ return 0;
+}
+
+static const struct of_device_id sunxi_gpadc_mfd_of_match[] = {
+ { .compatible = "allwinner,sun4i-a10-ts" },
+ { .compatible = "allwinner,sun5i-a13-ts" },
+ { .compatible = "allwinner,sun6i-a31-ts" },
+ { /* sentinel */ }
+};
+
+MODULE_DEVICE_TABLE(of, sunxi_gpadc_mfd_of_match);
+
+static struct platform_driver sunxi_gpadc_mfd_driver = {
+ .driver = {
+ .name = "sunxi-adc-mfd",
+ .of_match_table = of_match_ptr(sunxi_gpadc_mfd_of_match),
+ },
+ .probe = sunxi_gpadc_mfd_probe,
+ .remove = sunxi_gpadc_mfd_remove,
+};
+
+module_platform_driver(sunxi_gpadc_mfd_driver);
+
+MODULE_DESCRIPTION("ADC MFD core driver for sunxi platforms");
+MODULE_AUTHOR("Quentin Schulz <quentin.schulz@xxxxxxxxxxxxxxxxxx>");
+MODULE_LICENSE("GPL v2");
diff --git a/include/linux/mfd/sunxi-gpadc-mfd.h b/include/linux/mfd/sunxi-gpadc-mfd.h
new file mode 100644
index 0000000..7155845
--- /dev/null
+++ b/include/linux/mfd/sunxi-gpadc-mfd.h
@@ -0,0 +1,23 @@
+/* Header of ADC MFD core driver for sunxi platforms
+ *
+ * Copyright (c) 2016 Quentin Schulz <quentin.schulz@free-electrons>
+ *
+ * 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.
+ */
+
+#ifndef __SUNXI_GPADC_MFD__H__
+#define __SUNXI_GPADC_MFD__H__
+
+#define SUNXI_GPADC_TP_INT_FIFOC 0x10
+#define SUNXI_GPADC_TP_INT_FIFOS 0x14
+
+struct sunxi_gpadc_mfd_dev {
+ struct device *dev;
+ struct regmap *regmap;
+ struct regmap_irq_chip_data *regmap_irqc;
+ void __iomem *regs;
+};
+
+#endif
--
2.5.0

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