linux/drivers/mfd/mxs-lradc.c

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treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157 Based on 3 normalized pattern(s): 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 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 [author] [kishon] [vijay] [abraham] [i] [kishon]@[ti] [com] 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 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 [author] [graeme] [gregory] [gg]@[slimlogic] [co] [uk] [author] [kishon] [vijay] [abraham] [i] [kishon]@[ti] [com] [based] [on] [twl6030]_[usb] [c] [author] [hema] [hk] [hemahk]@[ti] [com] 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1105 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.202006027@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-27 06:55:06 +00:00
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* 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>
*/
#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;
}
fallthrough; /* 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) {
ret = -ENOMEM;
goto err_clk;
}
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");