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linux/drivers/mfd/mxs-lradc.c
Uwe Kleine-König 795cf0ac2a mfd: mxs-lradc: Convert to platform remove callback returning void 
The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is ignored (apart
from emitting a warning) and this typically results in resource leaks.

To improve here there is a quest to make the remove callback return
void. In the first step of this quest all drivers are converted to
.remove_new(), which already returns void. Eventually after all drivers
are converted, .remove_new() will be renamed to .remove().

Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20231123165627.492259-10-u.kleine-koenig@pengutronix.de
Signed-off-by: Lee Jones <lee@kernel.org>
2023-12-07 13:50:27 +00:00

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6.6 KiB
C
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// 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/platform_device.h>
#include <linux/property.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)
{
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;
lradc->soc = (enum mxs_lradc_id)device_get_match_data(&pdev->dev);
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 void mxs_lradc_remove(struct platform_device *pdev)
{
struct mxs_lradc *lradc = platform_get_drvdata(pdev);
clk_disable_unprepare(lradc->clk);
}
static struct platform_driver mxs_lradc_driver = {
.driver = {
.name = "mxs-lradc",
.of_match_table = mxs_lradc_dt_ids,
},
.probe = mxs_lradc_probe,
.remove_new = 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");
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