[PATCH v5 2/3] mfd: add support for Allwinner SoCs ADC
From: Lee Jones <hidden>
Date: 2016-09-12 09:16:40
Also in:
linux-hwmon, linux-iio, lkml
On Thu, 08 Sep 2016, Quentin Schulz wrote:
quoted hunk ↗ jump to hunk
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 <redacted> --- v5: - correct mail address, v4: - rename files and variables from sunxi* to sun4i*, - rename defines from SUNXI_* to SUN4I_* or SUN6I_*, - remove TP in defines name, - rename SUNXI_IRQ_* to SUN4I_GPADC_IRQ_* for consistency, - use devm functions for regmap_add_irq_chip and mfd_add_devices, - remove remove functions (now empty thanks to devm functions), v3: - use defines in regmap_irq instead of hard coded BITs, - use of_device_id data field to chose which MFD cells to add considering the compatible responsible of the MFD probe, - remove useless initializations, - disable all interrupts before adding them to regmap_irqchip, - add goto error label in probe, - correct wrapping in header license, - move defines from IIO driver to header, - use GENMASK to limit the size of the variable passed to a macro, - prefix register BIT defines with the name of the register, - reorder defines, v2: - add license headers, - reorder alphabetically includes, - add SUNXI_GPADC_ prefixes for defines, drivers/mfd/Kconfig | 15 ++++ drivers/mfd/Makefile | 2 + drivers/mfd/sun4i-gpadc-mfd.c | 174 ++++++++++++++++++++++++++++++++++++ include/linux/mfd/sun4i-gpadc-mfd.h | 94 +++++++++++++++++++ 4 files changed, 285 insertions(+) create mode 100644 drivers/mfd/sun4i-gpadc-mfd.c create mode 100644 include/linux/mfd/sun4i-gpadc-mfd.hdiff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index 1bcf601..95b3c3e 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig@@ -29,6 +29,21 @@ config MFD_ACT8945A linear regulators, along with a complete ActivePath battery charger. +config MFD_SUN4I_GPADC + tristate "Allwinner sunxi platforms' GPADC MFD driver" + select MFD_CORE + select REGMAP_MMIO + depends on ARCH_SUNXI || COMPILE_TEST + 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 + sun4i-gpadc-iio and the hwmon driver iio_hwmon. + + To compile this driver as a module, choose M here: the module will be + called sun4i-gpadc-mfd.
Drop the -mfd.
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config MFD_AS3711 bool "AMS AS3711" select MFD_COREdiff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile index 42a66e1..3b964d7 100644 --- a/drivers/mfd/Makefile +++ b/drivers/mfd/Makefile@@ -205,3 +205,5 @@ 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 obj-$(CONFIG_MFD_MT6397) += mt6397-core.o + +obj-$(CONFIG_MFD_SUN4I_GPADC) += sun4i-gpadc-mfd.odiff --git a/drivers/mfd/sun4i-gpadc-mfd.c b/drivers/mfd/sun4i-gpadc-mfd.c new file mode 100644 index 0000000..b499545 --- /dev/null +++ b/drivers/mfd/sun4i-gpadc-mfd.c
Drop the -mfd.
quoted hunk ↗ jump to hunk
@@ -0,0 +1,174 @@ +/* ADC MFD core driver for sunxi platforms + * + * Copyright (c) 2016 Quentin Schulz <quentin.schulz@free-electrons.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. + */ + +#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/sun4i-gpadc-mfd.h> + +static struct resource adc_resources[] = { + { + .name = "FIFO_DATA_PENDING", + .start = SUN4I_GPADC_IRQ_FIFO_DATA, + .end = SUN4I_GPADC_IRQ_FIFO_DATA, + .flags = IORESOURCE_IRQ, + }, { + .name = "TEMP_DATA_PENDING", + .start = SUN4I_GPADC_IRQ_TEMP_DATA, + .end = SUN4I_GPADC_IRQ_TEMP_DATA, + .flags = IORESOURCE_IRQ, + }, +};
Use the RES_IRQ_* defines.
+static const struct regmap_irq sun4i_gpadc_mfd_regmap_irq[] = {
+ REGMAP_IRQ_REG(SUN4I_GPADC_IRQ_FIFO_DATA, 0,
+ SUN4I_GPADC_INT_FIFOC_TP_DATA_IRQ_EN),
+ REGMAP_IRQ_REG(SUN4I_GPADC_IRQ_TEMP_DATA, 0,
+ SUN4I_GPADC_INT_FIFOC_TEMP_IRQ_EN),
+};
+
+static const struct regmap_irq_chip sun4i_gpadc_mfd_regmap_irq_chip = {
+ .name = "sun4i_gpadc_mfd_irq_chip",
+ .status_base = SUN4I_GPADC_INT_FIFOS,
+ .ack_base = SUN4I_GPADC_INT_FIFOS,
+ .mask_base = SUN4I_GPADC_INT_FIFOC,
+ .init_ack_masked = true,
+ .mask_invert = true,
+ .irqs = sun4i_gpadc_mfd_regmap_irq,
+ .num_irqs = ARRAY_SIZE(sun4i_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",
+ }
Single line please
{ .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",
+ },
+};As above.
+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",
+ },
+};As above.
+static const struct regmap_config sun4i_gpadc_mfd_regmap_config = {
+ .reg_bits = 32,
+ .val_bits = 32,
+ .reg_stride = 4,
+ .fast_io = true,
+};
+
+static const struct of_device_id sun4i_gpadc_mfd_of_match[] = {
+ {
+ .compatible = "allwinner,sun4i-a10-ts",
+ .data = &sun4i_gpadc_mfd_cells,
+ }, {
+ .compatible = "allwinner,sun5i-a13-ts",
+ .data = &sun5i_gpadc_mfd_cells,
+ }, {
+ .compatible = "allwinner,sun6i-a31-ts",
+ .data = &sun6i_gpadc_mfd_cells,
+ }, { /* sentinel */ }
+};Don't mix OF and MFD functionality. Why don't you create a node for "iio_hwmon" and have platform_of_populate() do your bidding?
+static int sun4i_gpadc_mfd_probe(struct platform_device *pdev)
Remove all mention of "mfd" from this file. (Accept the calls to the MFD API of course).
+{
+ struct sun4i_gpadc_mfd_dev *mfd_dev;
+ struct resource *mem;
+ const struct of_device_id *of_id;
+ const struct mfd_cell *mfd_cells;
+ unsigned int irq;
+ int ret;
+
+ of_id = of_match_node(sun4i_gpadc_mfd_of_match, pdev->dev.of_node);
+ if (!of_id)
+ return -EINVAL;
+
+ mfd_dev = devm_kzalloc(&pdev->dev, sizeof(*mfd_dev), GFP_KERNEL);
+ if (!mfd_dev)
+ return -ENOMEM;
+
+ mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ mfd_dev->regs = devm_ioremap_resource(&pdev->dev, mem);
+ if (IS_ERR(mfd_dev->regs))
+ return PTR_ERR(mfd_dev->regs);
+
+ mfd_dev->dev = &pdev->dev;
+ dev_set_drvdata(mfd_dev->dev, mfd_dev);
+
+ mfd_dev->regmap = devm_regmap_init_mmio(mfd_dev->dev, mfd_dev->regs,
+ &sun4i_gpadc_mfd_regmap_config);
+ if (IS_ERR(mfd_dev->regmap)) {
+ ret = PTR_ERR(mfd_dev->regmap);
+ dev_err(&pdev->dev, "failed to init regmap: %d\n", ret);
+ return ret;
+ }
+
+ /* Disable all interrupts */
+ regmap_write(mfd_dev->regmap, SUN4I_GPADC_INT_FIFOC, 0);
+
+ irq = platform_get_irq(pdev, 0);
+ ret = devm_regmap_add_irq_chip(&pdev->dev, mfd_dev->regmap, irq,
+ IRQF_ONESHOT, 0,
+ &sun4i_gpadc_mfd_regmap_irq_chip,
+ &mfd_dev->regmap_irqc);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to add irq chip: %d\n", ret);
+ return ret;
+ }
+
+ mfd_cells = of_id->data;
+ ret = devm_mfd_add_devices(mfd_dev->dev, 0, mfd_cells, 2, NULL, 0,
+ NULL);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to add MFD devices: %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+MODULE_DEVICE_TABLE(of, sun4i_gpadc_mfd_of_match);Place this directly under the table.
+static struct platform_driver sun4i_gpadc_mfd_driver = {
+ .driver = {
+ .name = "sun4i-adc-mfd",
+ .of_match_table = of_match_ptr(sun4i_gpadc_mfd_of_match),
+ },
+ .probe = sun4i_gpadc_mfd_probe,No .remove?
quoted hunk ↗ jump to hunk
+}; + +module_platform_driver(sun4i_gpadc_mfd_driver); + +MODULE_DESCRIPTION("Allwinner sunxi platforms' GPADC MFD core driver"); +MODULE_AUTHOR("Quentin Schulz [off-list ref]"); +MODULE_LICENSE("GPL v2");diff --git a/include/linux/mfd/sun4i-gpadc-mfd.h b/include/linux/mfd/sun4i-gpadc-mfd.h new file mode 100644 index 0000000..5cc7863 --- /dev/null +++ b/include/linux/mfd/sun4i-gpadc-mfd.h@@ -0,0 +1,94 @@ +/* Header of ADC MFD core driver for sunxi platforms + * + * Copyright (c) 2016 Quentin Schulz <quentin.schulz@free-electrons.mfd> + * + * 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 __SUN4I_GPADC_MFD__H__ +#define __SUN4I_GPADC_MFD__H__ + +#define SUN4I_GPADC_CTRL0 0x00 + +#define SUN4I_GPADC_CTRL0_ADC_FIRST_DLY(x) ((GENMASK(7, 0) & (x)) << 24) +#define SUN4I_GPADC_CTRL0_ADC_FIRST_DLY_MODE BIT(23) +#define SUN4I_GPADC_CTRL0_ADC_CLK_SELECT BIT(22) +#define SUN4I_GPADC_CTRL0_ADC_CLK_DIVIDER(x) ((GENMASK(1, 0) & (x)) << 20) +#define SUN4I_GPADC_CTRL0_FS_DIV(x) ((GENMASK(3, 0) & (x)) << 16) +#define SUN4I_GPADC_CTRL0_T_ACQ(x) (GENMASK(15, 0) & (x)) + +#define SUN4I_GPADC_CTRL1 0x04 + +#define SUN4I_GPADC_CTRL1_STYLUS_UP_DEBOUNCE(x) ((GENMASK(7, 0) & (x)) << 12) +#define SUN4I_GPADC_CTRL1_STYLUS_UP_DEBOUNCE_EN BIT(9) +#define SUN4I_GPADC_CTRL1_TOUCH_PAN_CALI_EN BIT(6) +#define SUN4I_GPADC_CTRL1_TP_DUAL_EN BIT(5) +#define SUN4I_GPADC_CTRL1_TP_MODE_EN BIT(4) +#define SUN4I_GPADC_CTRL1_TP_ADC_SELECT BIT(3) +#define SUN4I_GPADC_CTRL1_ADC_CHAN_SELECT(x) (GENMASK(2, 0) & (x)) + +/* TP_CTRL1 bits for sun6i SOCs */ +#define SUN6I_GPADC_CTRL1_TOUCH_PAN_CALI_EN BIT(7) +#define SUN6I_GPADC_CTRL1_TP_DUAL_EN BIT(6) +#define SUN6I_GPADC_CTRL1_TP_MODE_EN BIT(5) +#define SUN6I_GPADC_CTRL1_TP_ADC_SELECT BIT(4) +#define SUN6I_GPADC_CTRL1_ADC_CHAN_SELECT(x) (GENMASK(3, 0) & BIT(x)) + +#define SUN4I_GPADC_CTRL2 0x08 + +#define SUN4I_GPADC_CTRL2_TP_SENSITIVE_ADJUST(x) ((GENMASK(3, 0) & (x)) << 28) +#define SUN4I_GPADC_CTRL2_TP_MODE_SELECT(x) ((GENMASK(1, 0) & (x)) << 26) +#define SUN4I_GPADC_CTRL2_PRE_MEA_EN BIT(24) +#define SUN4I_GPADC_CTRL2_PRE_MEA_THRE_CNT(x) (GENMASK(23, 0) & (x)) + +#define SUN4I_GPADC_CTRL3 0x0c + +#define SUN4I_GPADC_CTRL3_FILTER_EN BIT(2) +#define SUN4I_GPADC_CTRL3_FILTER_TYPE(x) (GENMASK(1, 0) & (x)) + +#define SUN4I_GPADC_TPR 0x18 + +#define SUN4I_GPADC_TPR_TEMP_ENABLE BIT(16) +#define SUN4I_GPADC_TPR_TEMP_PERIOD(x) (GENMASK(15, 0) & (x)) + +#define SUN4I_GPADC_INT_FIFOC 0x10 + +#define SUN4I_GPADC_INT_FIFOC_TEMP_IRQ_EN BIT(18) +#define SUN4I_GPADC_INT_FIFOC_TP_OVERRUN_IRQ_EN BIT(17) +#define SUN4I_GPADC_INT_FIFOC_TP_DATA_IRQ_EN BIT(16) +#define SUN4I_GPADC_INT_FIFOC_TP_DATA_XY_CHANGE BIT(13) +#define SUN4I_GPADC_INT_FIFOC_TP_FIFO_TRIG_LEVEL(x) ((GENMASK(4, 0) & (x)) << 8) +#define SUN4I_GPADC_INT_FIFOC_TP_DATA_DRQ_EN BIT(7) +#define SUN4I_GPADC_INT_FIFOC_TP_FIFO_FLUSH BIT(4) +#define SUN4I_GPADC_INT_FIFOC_TP_UP_IRQ_EN BIT(1) +#define SUN4I_GPADC_INT_FIFOC_TP_DOWN_IRQ_EN BIT(0) + +#define SUN4I_GPADC_INT_FIFOS 0x14 + +#define SUN4I_GPADC_INT_FIFOS_TEMP_DATA_PENDING BIT(18) +#define SUN4I_GPADC_INT_FIFOS_FIFO_OVERRUN_PENDING BIT(17) +#define SUN4I_GPADC_INT_FIFOS_FIFO_DATA_PENDING BIT(16) +#define SUN4I_GPADC_INT_FIFOS_TP_IDLE_FLG BIT(2) +#define SUN4I_GPADC_INT_FIFOS_TP_UP_PENDING BIT(1) +#define SUN4I_GPADC_INT_FIFOS_TP_DOWN_PENDING BIT(0) + +#define SUN4I_GPADC_CDAT 0x1c +#define SUN4I_GPADC_TEMP_DATA 0x20 +#define SUN4I_GPADC_DATA 0x24 + +#define SUN4I_GPADC_IRQ_FIFO_DATA 0 +#define SUN4I_GPADC_IRQ_TEMP_DATA 1 + +/* 10s delay before suspending the IP */ +#define SUN4I_GPADC_AUTOSUSPEND_DELAY 10000 + +struct sun4i_gpadc_mfd_dev { + struct device *dev; + struct regmap *regmap; + struct regmap_irq_chip_data *regmap_irqc; + void __iomem *regs;
It's *much* more common to call this 'base'.
+}; + +#endif
-- Lee Jones Linaro STMicroelectronics Landing Team Lead Linaro.org ? Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog