mfd: mxs-lradc: Add support for mxs-lradc
Add core files for low resolution analog-to-digital converter (mxs-lradc) MFD driver. Signed-off-by: Ksenija Stanojevic <ksenija.stanojevic@gmail.com> Reviewed-by: Marek Vasut <marex@denx.de> Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Ksenija Stanojevic
Lee Jones
parent
c1ae3cfa0e
commit
ead25133e9
|
|
@ -344,6 +344,23 @@ 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
|
||||
|
|
|
|||
|
|
@ -215,3 +215,4 @@ obj-$(CONFIG_MFD_ALTERA_A10SR) += altera-a10sr.o
|
|||
obj-$(CONFIG_MFD_SUN4I_GPADC) += sun4i-gpadc.o
|
||||
|
||||
obj-$(CONFIG_MFD_STM32_TIMERS) += stm32-timers.o
|
||||
obj-$(CONFIG_MFD_MXS_LRADC) += mxs-lradc.o
|
||||
|
|
|
|||
267
drivers/mfd/mxs-lradc.c
Normal file
267
drivers/mfd/mxs-lradc.c
Normal file
|
|
@ -0,0 +1,267 @@
|
|||
/*
|
||||
* Freescale MXS Low Resolution Analog-to-Digital Converter driver
|
||||
*
|
||||
* Copyright (c) 2012 DENX Software Engineering, GmbH.
|
||||
* Copyright (c) 2017 Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
|
||||
*
|
||||
* Authors:
|
||||
* Marek Vasut <marex@denx.de>
|
||||
* Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
|
||||
*
|
||||
* 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;
|
||||
}
|
||||
|
||||
if (!lradc->touchscreen_wire)
|
||||
return 0;
|
||||
|
||||
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@gmail.com>");
|
||||
MODULE_DESCRIPTION("Freescale i.MX23/i.MX28 LRADC driver");
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_ALIAS("platform:mxs-lradc");
|
||||
187
include/linux/mfd/mxs-lradc.h
Normal file
187
include/linux/mfd/mxs-lradc.h
Normal file
|
|
@ -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@gmail.com>
|
||||
*
|
||||
* Author: Marek Vasut <marex@denx.de>
|
||||
*
|
||||
* 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) BIT(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 */
|
||||
Loading…
Reference in New Issue
Block a user