[PATCH v11 1/5] mfd: mxs-lradc: Add support for mxs-lradc MFD
From: Ksenija Stanojevic
Date: Thu Dec 08 2016 - 17:27:28 EST
Add core files for low resolution analog-to-digital converter (mxs-lradc)
MFD driver.
Signed-off-by: Ksenija Stanojevic <ksenija.stanojevic@xxxxxxxxx>
---
Changes in v11:
- create static struct mfd_cells
- don't set platform data in mfd cells, set driver data instead
- remove mxs_lradc_reg_* functions, use writel function instead
Changes in v10:
- fetch base address from DT
- add a NULL check for of_match_device
Changes in v9:
- improve commit message.
Changes in v8:
- rebase onto 4.9-rc1
Changes in v7:
- define macros ADC_CELL and TSC_CELL
- remove one cell and dynamically set them in the switch()
- fail in the touchscreen driver instead of mfd driver if
hardware doesn't contain a touchscreen
Changes in v6:
- update copyright
- add kernel-doc header for struct mxs-lradc
- add error message
- change EINVAL to ENODEV
- use PLATFORM_DEVID_NONE instead -1
- cosmetic fixes
Changes in v5:
- use DEFINE_RES_MEM
- don't pass ioreammaped adress to platform cells
- move comment outside of struct mxs_lradc
- change type of argument in mxs_lradc_reg_set, mxs_lradc_reg_clear,
mxs_lradc_reg_wrt (struct mxs_lradc * -> void __iomem *)
Changes in v4:
- update copyright
- use DEFINE_RES_IRQ_NAMED
- remove mxs_lradc_add_device function
- use struct mfd_cell in static form
- improve spacing
- remove unnecessary comment
- remove platform_get_irq
- remove touch_ret and use ret instead
- rename use_touchscreen to touchscreen_wire
- use goto statements
- remove irq[13], irq_count and irq_name from struct mxs_lradc
- remove all defines from inside the struct definition
Changes in v3:
- add note to commit message
- move switch statement into if(touch_ret == 0) branch
- add MODULE_AUTHOR
Changes in v2:
- do not change spacing in Kconfig
- make struct mfd_cell part of struct mxs_lradc
- use switch instead of if in mxs_lradc_irq_mask
- use only necessary header files in mxs_lradc.h
- use devm_mfd_add_device
- use separate function to register mfd device
- change licence to GPL
- add copyright
drivers/mfd/Kconfig | 17 +++
drivers/mfd/Makefile | 1 +
drivers/mfd/mxs-lradc.c | 264 ++++++++++++++++++++++++++++++++++++++++++
include/linux/mfd/mxs-lradc.h | 187 ++++++++++++++++++++++++++++++
4 files changed, 469 insertions(+)
create mode 100644 drivers/mfd/mxs-lradc.c
create mode 100644 include/linux/mfd/mxs-lradc.h
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 819dc0a..e5c1289 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -343,6 +343,23 @@ config MFD_MC13XXX_I2C
help
Select this if your MC13xxx is connected via an I2C bus.
+config MFD_MXS_LRADC
+ tristate "Freescale i.MX23/i.MX28 LRADC"
+ depends on ARCH_MXS || COMPILE_TEST
+ select MFD_CORE
+ select STMP_DEVICE
+ help
+ Say yes here to build support for the Low Resolution
+ Analog-to-Digital Converter (LRADC) found on the i.MX23 and i.MX28
+ processors. This driver provides common support for accessing the
+ device, additional drivers must be enabled in order to use the
+ functionality of the device:
+ mxs-lradc-adc for ADC readings
+ mxs-lradc-ts for touchscreen support
+
+ This driver can also be built as a module. If so, the module will be
+ called mxs-lradc.
+
config MFD_MX25_TSADC
tristate "Freescale i.MX25 integrated Touchscreen and ADC unit"
select REGMAP_MMIO
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index db39377..90e9f36 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -212,3 +212,4 @@ obj-$(CONFIG_MFD_MT6397) += mt6397-core.o
obj-$(CONFIG_MFD_ALTERA_A10SR) += altera-a10sr.o
obj-$(CONFIG_MFD_SUN4I_GPADC) += sun4i-gpadc.o
+obj-$(CONFIG_MFD_MXS_LRADC) += mxs-lradc.o
diff --git a/drivers/mfd/mxs-lradc.c b/drivers/mfd/mxs-lradc.c
new file mode 100644
index 0000000..e29ff55
--- /dev/null
+++ b/drivers/mfd/mxs-lradc.c
@@ -0,0 +1,264 @@
+/*
+ * Freescale MXS Low Resolution Analog-to-Digital Converter driver
+ *
+ * Copyright (c) 2012 DENX Software Engineering, GmbH.
+ * Copyright (c) 2016 Ksenija Stanojevic <ksenija.stanojevic@xxxxxxxxx>
+ *
+ * Authors:
+ * Marek Vasut <marex@xxxxxxx>
+ * Ksenija Stanojevic <ksenija.stanojevic@xxxxxxxxx>
+ *
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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/clk.h>
+#include <linux/device.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/mxs-lradc.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#define ADC_CELL 0
+#define TSC_CELL 1
+#define RES_MEM 0
+
+enum mx23_lradc_irqs {
+ MX23_LRADC_TS_IRQ = 0,
+ MX23_LRADC_CH0_IRQ,
+ MX23_LRADC_CH1_IRQ,
+ MX23_LRADC_CH2_IRQ,
+ MX23_LRADC_CH3_IRQ,
+ MX23_LRADC_CH4_IRQ,
+ MX23_LRADC_CH5_IRQ,
+ MX23_LRADC_CH6_IRQ,
+ MX23_LRADC_CH7_IRQ,
+};
+
+enum mx28_lradc_irqs {
+ MX28_LRADC_TS_IRQ = 0,
+ MX28_LRADC_TRESH0_IRQ,
+ MX28_LRADC_TRESH1_IRQ,
+ MX28_LRADC_CH0_IRQ,
+ MX28_LRADC_CH1_IRQ,
+ MX28_LRADC_CH2_IRQ,
+ MX28_LRADC_CH3_IRQ,
+ MX28_LRADC_CH4_IRQ,
+ MX28_LRADC_CH5_IRQ,
+ MX28_LRADC_CH6_IRQ,
+ MX28_LRADC_CH7_IRQ,
+ MX28_LRADC_BUTTON0_IRQ,
+ MX28_LRADC_BUTTON1_IRQ,
+};
+
+static struct resource mx23_adc_resources[] = {
+ DEFINE_RES_MEM(0x0, 0x0),
+ DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH0_IRQ, "mxs-lradc-channel0"),
+ DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH1_IRQ, "mxs-lradc-channel1"),
+ DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH2_IRQ, "mxs-lradc-channel2"),
+ DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH3_IRQ, "mxs-lradc-channel3"),
+ DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH4_IRQ, "mxs-lradc-channel4"),
+ DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH5_IRQ, "mxs-lradc-channel5"),
+};
+
+static struct resource mx23_touchscreen_resources[] = {
+ DEFINE_RES_MEM(0x0, 0x0),
+ DEFINE_RES_IRQ_NAMED(MX23_LRADC_TS_IRQ, "mxs-lradc-touchscreen"),
+ DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH6_IRQ, "mxs-lradc-channel6"),
+ DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH7_IRQ, "mxs-lradc-channel7"),
+};
+
+static struct resource mx28_adc_resources[] = {
+ DEFINE_RES_MEM(0x0, 0x0),
+ DEFINE_RES_IRQ_NAMED(MX28_LRADC_TRESH0_IRQ, "mxs-lradc-thresh0"),
+ DEFINE_RES_IRQ_NAMED(MX28_LRADC_TRESH1_IRQ, "mxs-lradc-thresh1"),
+ DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH0_IRQ, "mxs-lradc-channel0"),
+ DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH1_IRQ, "mxs-lradc-channel1"),
+ DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH2_IRQ, "mxs-lradc-channel2"),
+ DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH3_IRQ, "mxs-lradc-channel3"),
+ DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH4_IRQ, "mxs-lradc-channel4"),
+ DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH5_IRQ, "mxs-lradc-channel5"),
+ DEFINE_RES_IRQ_NAMED(MX28_LRADC_BUTTON0_IRQ, "mxs-lradc-button0"),
+ DEFINE_RES_IRQ_NAMED(MX28_LRADC_BUTTON1_IRQ, "mxs-lradc-button1"),
+};
+
+static struct resource mx28_touchscreen_resources[] = {
+ DEFINE_RES_MEM(0x0, 0x0),
+ DEFINE_RES_IRQ_NAMED(MX28_LRADC_TS_IRQ, "mxs-lradc-touchscreen"),
+ DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH6_IRQ, "mxs-lradc-channel6"),
+ DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH7_IRQ, "mxs-lradc-channel7"),
+};
+
+static struct mfd_cell mx23_cells[] = {
+ {
+ .name = "mxs-lradc-adc",
+ .resources = mx23_adc_resources,
+ .num_resources = ARRAY_SIZE(mx23_adc_resources),
+ },
+ {
+ .name = "mxs-lradc-ts",
+ .resources = mx23_touchscreen_resources,
+ .num_resources = ARRAY_SIZE(mx23_touchscreen_resources),
+ },
+};
+
+static struct mfd_cell mx28_cells[] = {
+ {
+ .name = "mxs-lradc-adc",
+ .resources = mx28_adc_resources,
+ .num_resources = ARRAY_SIZE(mx28_adc_resources),
+ },
+ {
+ .name = "mxs-lradc-ts",
+ .resources = mx28_touchscreen_resources,
+ .num_resources = ARRAY_SIZE(mx28_touchscreen_resources),
+ }
+};
+
+static const struct of_device_id mxs_lradc_dt_ids[] = {
+ { .compatible = "fsl,imx23-lradc", .data = (void *)IMX23_LRADC, },
+ { .compatible = "fsl,imx28-lradc", .data = (void *)IMX28_LRADC, },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, mxs_lradc_dt_ids);
+
+static int mxs_lradc_probe(struct platform_device *pdev)
+{
+ const struct of_device_id *of_id;
+ struct device *dev = &pdev->dev;
+ struct device_node *node = dev->of_node;
+ struct mxs_lradc *lradc;
+ struct mfd_cell *cells = NULL;
+ struct resource *res;
+ int ret = 0;
+ u32 ts_wires = 0;
+
+ lradc = devm_kzalloc(&pdev->dev, sizeof(*lradc), GFP_KERNEL);
+ if (!lradc)
+ return -ENOMEM;
+
+ of_id = of_match_device(mxs_lradc_dt_ids, &pdev->dev);
+ if (!of_id)
+ return -EINVAL;
+
+ lradc->soc = (enum mxs_lradc_id)of_id->data;
+
+ lradc->clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(lradc->clk)) {
+ dev_err(dev, "Failed to get the delay unit clock\n");
+ return PTR_ERR(lradc->clk);
+ }
+
+ ret = clk_prepare_enable(lradc->clk);
+ if (ret) {
+ dev_err(dev, "Failed to enable the delay unit clock\n");
+ return ret;
+ }
+
+ ret = of_property_read_u32(node, "fsl,lradc-touchscreen-wires",
+ &ts_wires);
+
+ if (!ret) {
+ lradc->buffer_vchans = BUFFER_VCHANS_LIMITED;
+
+ switch (ts_wires) {
+ case 4:
+ lradc->touchscreen_wire = MXS_LRADC_TOUCHSCREEN_4WIRE;
+ break;
+ case 5:
+ if (lradc->soc == IMX28_LRADC) {
+ lradc->touchscreen_wire =
+ MXS_LRADC_TOUCHSCREEN_5WIRE;
+ break;
+ }
+ /* fall through to an error message for i.MX23 */
+ default:
+ dev_err(&pdev->dev,
+ "Unsupported number of touchscreen wires (%d)\n"
+ , ts_wires);
+ ret = -EINVAL;
+ goto err_clk;
+ }
+ } else {
+ lradc->buffer_vchans = BUFFER_VCHANS_ALL;
+ }
+
+ platform_set_drvdata(pdev, lradc);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
+ return -ENOMEM;
+
+ switch (lradc->soc) {
+ case IMX23_LRADC:
+ mx23_adc_resources[RES_MEM] = *res;
+ mx23_touchscreen_resources[RES_MEM] = *res;
+ cells = mx23_cells;
+ break;
+ case IMX28_LRADC:
+ mx28_adc_resources[RES_MEM] = *res;
+ mx28_touchscreen_resources[RES_MEM] = *res;
+ cells = mx28_cells;
+ break;
+ default:
+ dev_err(dev, "Unsupported SoC\n");
+ ret = -ENODEV;
+ goto err_clk;
+ }
+
+ ret = devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE,
+ &cells[ADC_CELL], 1, NULL, 0, NULL);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to add the ADC subdevice\n");
+ goto err_clk;
+ }
+
+ ret = devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE,
+ &cells[TSC_CELL], 1, NULL, 0, NULL);
+ if (ret) {
+ dev_err(&pdev->dev,
+ "Failed to add the touchscreen subdevice\n");
+ goto err_clk;
+ }
+
+ return 0;
+
+err_clk:
+ clk_disable_unprepare(lradc->clk);
+
+ return ret;
+}
+
+static int mxs_lradc_remove(struct platform_device *pdev)
+{
+ struct mxs_lradc *lradc = platform_get_drvdata(pdev);
+
+ clk_disable_unprepare(lradc->clk);
+
+ return 0;
+}
+
+static struct platform_driver mxs_lradc_driver = {
+ .driver = {
+ .name = "mxs-lradc",
+ .of_match_table = mxs_lradc_dt_ids,
+ },
+ .probe = mxs_lradc_probe,
+ .remove = mxs_lradc_remove,
+};
+module_platform_driver(mxs_lradc_driver);
+
+MODULE_AUTHOR("Ksenija Stanojevic <ksenija.stanojevic@xxxxxxxxx>");
+MODULE_DESCRIPTION("Freescale i.MX23/i.MX28 LRADC driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:mxs-lradc");
diff --git a/include/linux/mfd/mxs-lradc.h b/include/linux/mfd/mxs-lradc.h
new file mode 100644
index 0000000..7bb924d
--- /dev/null
+++ b/include/linux/mfd/mxs-lradc.h
@@ -0,0 +1,187 @@
+/*
+ * Freescale MXS Low Resolution Analog-to-Digital Converter driver
+ *
+ * Copyright (c) 2012 DENX Software Engineering, GmbH.
+ * Copyright (c) 2016 Ksenija Stanojevic <ksenija.stanojevic@xxxxxxxxx>
+ *
+ * Author: Marek Vasut <marex@xxxxxxx>
+ *
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ */
+
+#ifndef __MFD_MXS_LRADC_H
+#define __MFD_MXS_LRADC_H
+
+#include <linux/bitops.h>
+#include <linux/io.h>
+#include <linux/stmp_device.h>
+
+#define LRADC_MAX_DELAY_CHANS 4
+#define LRADC_MAX_MAPPED_CHANS 8
+#define LRADC_MAX_TOTAL_CHANS 16
+
+#define LRADC_DELAY_TIMER_HZ 2000
+
+#define LRADC_CTRL0 0x00
+# define LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE BIT(23)
+# define LRADC_CTRL0_MX28_TOUCH_SCREEN_TYPE BIT(22)
+# define LRADC_CTRL0_MX28_YNNSW /* YM */ BIT(21)
+# define LRADC_CTRL0_MX28_YPNSW /* YP */ BIT(20)
+# define LRADC_CTRL0_MX28_YPPSW /* YP */ BIT(19)
+# define LRADC_CTRL0_MX28_XNNSW /* XM */ BIT(18)
+# define LRADC_CTRL0_MX28_XNPSW /* XM */ BIT(17)
+# define LRADC_CTRL0_MX28_XPPSW /* XP */ BIT(16)
+
+# define LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE BIT(20)
+# define LRADC_CTRL0_MX23_YM BIT(19)
+# define LRADC_CTRL0_MX23_XM BIT(18)
+# define LRADC_CTRL0_MX23_YP BIT(17)
+# define LRADC_CTRL0_MX23_XP BIT(16)
+
+# define LRADC_CTRL0_MX28_PLATE_MASK \
+ (LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE | \
+ LRADC_CTRL0_MX28_YNNSW | LRADC_CTRL0_MX28_YPNSW | \
+ LRADC_CTRL0_MX28_YPPSW | LRADC_CTRL0_MX28_XNNSW | \
+ LRADC_CTRL0_MX28_XNPSW | LRADC_CTRL0_MX28_XPPSW)
+
+# define LRADC_CTRL0_MX23_PLATE_MASK \
+ (LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE | \
+ LRADC_CTRL0_MX23_YM | LRADC_CTRL0_MX23_XM | \
+ LRADC_CTRL0_MX23_YP | LRADC_CTRL0_MX23_XP)
+
+#define LRADC_CTRL1 0x10
+#define LRADC_CTRL1_TOUCH_DETECT_IRQ_EN BIT(24)
+#define LRADC_CTRL1_LRADC_IRQ_EN(n) (1 << ((n) + 16))
+#define LRADC_CTRL1_MX28_LRADC_IRQ_EN_MASK (0x1fff << 16)
+#define LRADC_CTRL1_MX23_LRADC_IRQ_EN_MASK (0x01ff << 16)
+#define LRADC_CTRL1_LRADC_IRQ_EN_OFFSET 16
+#define LRADC_CTRL1_TOUCH_DETECT_IRQ BIT(8)
+#define LRADC_CTRL1_LRADC_IRQ(n) (1 << (n))
+#define LRADC_CTRL1_MX28_LRADC_IRQ_MASK 0x1fff
+#define LRADC_CTRL1_MX23_LRADC_IRQ_MASK 0x01ff
+#define LRADC_CTRL1_LRADC_IRQ_OFFSET 0
+
+#define LRADC_CTRL2 0x20
+#define LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET 24
+#define LRADC_CTRL2_TEMPSENSE_PWD BIT(15)
+
+#define LRADC_STATUS 0x40
+#define LRADC_STATUS_TOUCH_DETECT_RAW BIT(0)
+
+#define LRADC_CH(n) (0x50 + (0x10 * (n)))
+#define LRADC_CH_ACCUMULATE BIT(29)
+#define LRADC_CH_NUM_SAMPLES_MASK (0x1f << 24)
+#define LRADC_CH_NUM_SAMPLES_OFFSET 24
+#define LRADC_CH_NUM_SAMPLES(x) \
+ ((x) << LRADC_CH_NUM_SAMPLES_OFFSET)
+#define LRADC_CH_VALUE_MASK 0x3ffff
+#define LRADC_CH_VALUE_OFFSET 0
+
+#define LRADC_DELAY(n) (0xd0 + (0x10 * (n)))
+#define LRADC_DELAY_TRIGGER_LRADCS_MASK (0xffUL << 24)
+#define LRADC_DELAY_TRIGGER_LRADCS_OFFSET 24
+#define LRADC_DELAY_TRIGGER(x) \
+ (((x) << LRADC_DELAY_TRIGGER_LRADCS_OFFSET) & \
+ LRADC_DELAY_TRIGGER_LRADCS_MASK)
+#define LRADC_DELAY_KICK BIT(20)
+#define LRADC_DELAY_TRIGGER_DELAYS_MASK (0xf << 16)
+#define LRADC_DELAY_TRIGGER_DELAYS_OFFSET 16
+#define LRADC_DELAY_TRIGGER_DELAYS(x) \
+ (((x) << LRADC_DELAY_TRIGGER_DELAYS_OFFSET) & \
+ LRADC_DELAY_TRIGGER_DELAYS_MASK)
+#define LRADC_DELAY_LOOP_COUNT_MASK (0x1f << 11)
+#define LRADC_DELAY_LOOP_COUNT_OFFSET 11
+#define LRADC_DELAY_LOOP(x) \
+ (((x) << LRADC_DELAY_LOOP_COUNT_OFFSET) & \
+ LRADC_DELAY_LOOP_COUNT_MASK)
+#define LRADC_DELAY_DELAY_MASK 0x7ff
+#define LRADC_DELAY_DELAY_OFFSET 0
+#define LRADC_DELAY_DELAY(x) \
+ (((x) << LRADC_DELAY_DELAY_OFFSET) & \
+ LRADC_DELAY_DELAY_MASK)
+
+#define LRADC_CTRL4 0x140
+#define LRADC_CTRL4_LRADCSELECT_MASK(n) (0xf << ((n) * 4))
+#define LRADC_CTRL4_LRADCSELECT_OFFSET(n) ((n) * 4)
+#define LRADC_CTRL4_LRADCSELECT(n, x) \
+ (((x) << LRADC_CTRL4_LRADCSELECT_OFFSET(n)) & \
+ LRADC_CTRL4_LRADCSELECT_MASK(n))
+
+#define LRADC_RESOLUTION 12
+#define LRADC_SINGLE_SAMPLE_MASK ((1 << LRADC_RESOLUTION) - 1)
+
+#define BUFFER_VCHANS_LIMITED 0x3f
+#define BUFFER_VCHANS_ALL 0xff
+
+ /*
+ * Certain LRADC channels are shared between touchscreen
+ * and/or touch-buttons and generic LRADC block. Therefore when using
+ * either of these, these channels are not available for the regular
+ * sampling. The shared channels are as follows:
+ *
+ * CH0 -- Touch button #0
+ * CH1 -- Touch button #1
+ * CH2 -- Touch screen XPUL
+ * CH3 -- Touch screen YPLL
+ * CH4 -- Touch screen XNUL
+ * CH5 -- Touch screen YNLR
+ * CH6 -- Touch screen WIPER (5-wire only)
+ *
+ * The bit fields below represents which parts of the LRADC block are
+ * switched into special mode of operation. These channels can not
+ * be sampled as regular LRADC channels. The driver will refuse any
+ * attempt to sample these channels.
+ */
+#define CHAN_MASK_TOUCHBUTTON (BIT(1) | BIT(0))
+#define CHAN_MASK_TOUCHSCREEN_4WIRE (0xf << 2)
+#define CHAN_MASK_TOUCHSCREEN_5WIRE (0x1f << 2)
+
+enum mxs_lradc_id {
+ IMX23_LRADC,
+ IMX28_LRADC,
+};
+
+enum mxs_lradc_ts_wires {
+ MXS_LRADC_TOUCHSCREEN_NONE = 0,
+ MXS_LRADC_TOUCHSCREEN_4WIRE,
+ MXS_LRADC_TOUCHSCREEN_5WIRE,
+};
+
+/**
+ * struct mxs_lradc
+ * @soc: soc type (IMX23 or IMX28)
+ * @clk: 2 kHz clock for delay units
+ * @buffer_vchans: channels that can be used during buffered capture
+ * @touchscreen_wire: touchscreen type (4-wire or 5-wire)
+ * @use_touchbutton: button state (on or off)
+ */
+struct mxs_lradc {
+ enum mxs_lradc_id soc;
+ struct clk *clk;
+ u8 buffer_vchans;
+
+ enum mxs_lradc_ts_wires touchscreen_wire;
+ bool use_touchbutton;
+};
+
+static inline u32 mxs_lradc_irq_mask(struct mxs_lradc *lradc)
+{
+ switch (lradc->soc) {
+ case IMX23_LRADC:
+ return LRADC_CTRL1_MX23_LRADC_IRQ_MASK;
+ case IMX28_LRADC:
+ return LRADC_CTRL1_MX28_LRADC_IRQ_MASK;
+ default:
+ return 0;
+ }
+}
+
+#endif /* __MXS_LRADC_H */
--
1.9.1