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linux/drivers/input/touchscreen/da9052_tsi.c
Linus Torvalds bf4afc53b7 Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 
This was done entirely with mindless brute force, using

    git grep -l '\<k[vmz]*alloc_objs*(.*, GFP_KERNEL)' |
        xargs sed -i 's/\(alloc_objs*(.*\), GFP_KERNEL)/\1)/'

to convert the new alloc_obj() users that had a simple GFP_KERNEL
argument to just drop that argument.

Note that due to the extreme simplicity of the scripting, any slightly
more complex cases spread over multiple lines would not be triggered:
they definitely exist, but this covers the vast bulk of the cases, and
the resulting diff is also then easier to check automatically.

For the same reason the 'flex' versions will be done as a separate
conversion.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2026-02-21 17:09:51 -08:00

341 lines
8.0 KiB
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* TSI driver for Dialog DA9052
*
* Copyright(c) 2012 Dialog Semiconductor Ltd.
*
* Author: David Dajun Chen <dchen@diasemi.com>
*/
#include <linux/module.h>
#include <linux/input.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/mfd/da9052/reg.h>
#include <linux/mfd/da9052/da9052.h>
#define TSI_PEN_DOWN_STATUS 0x40
struct da9052_tsi {
struct da9052 *da9052;
struct input_dev *dev;
struct delayed_work ts_pen_work;
bool stopped;
bool adc_on;
};
static void da9052_ts_adc_toggle(struct da9052_tsi *tsi, bool on)
{
da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG, 1 << 0, on);
tsi->adc_on = on;
}
static irqreturn_t da9052_ts_pendwn_irq(int irq, void *data)
{
struct da9052_tsi *tsi = data;
if (!tsi->stopped) {
/* Mask PEN_DOWN event and unmask TSI_READY event */
da9052_disable_irq_nosync(tsi->da9052, DA9052_IRQ_PENDOWN);
da9052_enable_irq(tsi->da9052, DA9052_IRQ_TSIREADY);
da9052_ts_adc_toggle(tsi, true);
schedule_delayed_work(&tsi->ts_pen_work, HZ / 50);
}
return IRQ_HANDLED;
}
static void da9052_ts_read(struct da9052_tsi *tsi)
{
struct input_dev *input = tsi->dev;
int ret;
u16 x, y, z;
u8 v;
ret = da9052_reg_read(tsi->da9052, DA9052_TSI_X_MSB_REG);
if (ret < 0)
return;
x = (u16) ret;
ret = da9052_reg_read(tsi->da9052, DA9052_TSI_Y_MSB_REG);
if (ret < 0)
return;
y = (u16) ret;
ret = da9052_reg_read(tsi->da9052, DA9052_TSI_Z_MSB_REG);
if (ret < 0)
return;
z = (u16) ret;
ret = da9052_reg_read(tsi->da9052, DA9052_TSI_LSB_REG);
if (ret < 0)
return;
v = (u8) ret;
x = ((x << 2) & 0x3fc) | (v & 0x3);
y = ((y << 2) & 0x3fc) | ((v & 0xc) >> 2);
z = ((z << 2) & 0x3fc) | ((v & 0x30) >> 4);
input_report_key(input, BTN_TOUCH, 1);
input_report_abs(input, ABS_X, x);
input_report_abs(input, ABS_Y, y);
input_report_abs(input, ABS_PRESSURE, z);
input_sync(input);
}
static irqreturn_t da9052_ts_datardy_irq(int irq, void *data)
{
struct da9052_tsi *tsi = data;
da9052_ts_read(tsi);
return IRQ_HANDLED;
}
static void da9052_ts_pen_work(struct work_struct *work)
{
struct da9052_tsi *tsi = container_of(work, struct da9052_tsi,
ts_pen_work.work);
if (!tsi->stopped) {
int ret = da9052_reg_read(tsi->da9052, DA9052_TSI_LSB_REG);
if (ret < 0 || (ret & TSI_PEN_DOWN_STATUS)) {
/* Pen is still DOWN (or read error) */
schedule_delayed_work(&tsi->ts_pen_work, HZ / 50);
} else {
struct input_dev *input = tsi->dev;
/* Pen UP */
da9052_ts_adc_toggle(tsi, false);
/* Report Pen UP */
input_report_key(input, BTN_TOUCH, 0);
input_report_abs(input, ABS_PRESSURE, 0);
input_sync(input);
/*
* FIXME: Fixes the unhandled irq issue when quick
* pen down and pen up events occurs
*/
ret = da9052_reg_update(tsi->da9052,
DA9052_EVENT_B_REG, 0xC0, 0xC0);
if (ret < 0)
return;
/* Mask TSI_READY event and unmask PEN_DOWN event */
da9052_disable_irq(tsi->da9052, DA9052_IRQ_TSIREADY);
da9052_enable_irq(tsi->da9052, DA9052_IRQ_PENDOWN);
}
}
}
static int da9052_ts_configure_gpio(struct da9052 *da9052)
{
int error;
error = da9052_reg_update(da9052, DA9052_GPIO_2_3_REG, 0x30, 0);
if (error < 0)
return error;
error = da9052_reg_update(da9052, DA9052_GPIO_4_5_REG, 0x33, 0);
if (error < 0)
return error;
error = da9052_reg_update(da9052, DA9052_GPIO_6_7_REG, 0x33, 0);
if (error < 0)
return error;
return 0;
}
static int da9052_configure_tsi(struct da9052_tsi *tsi)
{
int error;
error = da9052_ts_configure_gpio(tsi->da9052);
if (error)
return error;
/* Measure TSI sample every 1ms */
error = da9052_reg_update(tsi->da9052, DA9052_ADC_CONT_REG,
1 << 6, 1 << 6);
if (error < 0)
return error;
/* TSI_DELAY: 3 slots, TSI_SKIP: 0 slots, TSI_MODE: XYZP */
error = da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG, 0xFC, 0xC0);
if (error < 0)
return error;
/* Supply TSIRef through LD09 */
error = da9052_reg_write(tsi->da9052, DA9052_LDO9_REG, 0x59);
if (error < 0)
return error;
return 0;
}
static int da9052_ts_input_open(struct input_dev *input_dev)
{
struct da9052_tsi *tsi = input_get_drvdata(input_dev);
tsi->stopped = false;
mb();
/* Unmask PEN_DOWN event */
da9052_enable_irq(tsi->da9052, DA9052_IRQ_PENDOWN);
/* Enable Pen Detect Circuit */
return da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG,
1 << 1, 1 << 1);
}
static void da9052_ts_input_close(struct input_dev *input_dev)
{
struct da9052_tsi *tsi = input_get_drvdata(input_dev);
tsi->stopped = true;
mb();
da9052_disable_irq(tsi->da9052, DA9052_IRQ_PENDOWN);
cancel_delayed_work_sync(&tsi->ts_pen_work);
if (tsi->adc_on) {
da9052_disable_irq(tsi->da9052, DA9052_IRQ_TSIREADY);
da9052_ts_adc_toggle(tsi, false);
/*
* If ADC was on that means that pendwn IRQ was disabled
* twice and we need to enable it to keep enable/disable
* counter balanced. IRQ is still off though.
*/
da9052_enable_irq(tsi->da9052, DA9052_IRQ_PENDOWN);
}
/* Disable Pen Detect Circuit */
da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG, 1 << 1, 0);
}
static int da9052_ts_probe(struct platform_device *pdev)
{
struct da9052 *da9052;
struct da9052_tsi *tsi;
struct input_dev *input_dev;
int error;
da9052 = dev_get_drvdata(pdev->dev.parent);
if (!da9052)
return -EINVAL;
tsi = kzalloc_obj(*tsi);
input_dev = input_allocate_device();
if (!tsi || !input_dev) {
error = -ENOMEM;
goto err_free_mem;
}
tsi->da9052 = da9052;
tsi->dev = input_dev;
tsi->stopped = true;
INIT_DELAYED_WORK(&tsi->ts_pen_work, da9052_ts_pen_work);
input_dev->id.version = 0x0101;
input_dev->id.vendor = 0x15B6;
input_dev->id.product = 0x9052;
input_dev->name = "Dialog DA9052 TouchScreen Driver";
input_dev->dev.parent = &pdev->dev;
input_dev->open = da9052_ts_input_open;
input_dev->close = da9052_ts_input_close;
__set_bit(EV_ABS, input_dev->evbit);
__set_bit(EV_KEY, input_dev->evbit);
__set_bit(BTN_TOUCH, input_dev->keybit);
input_set_abs_params(input_dev, ABS_X, 0, 1023, 0, 0);
input_set_abs_params(input_dev, ABS_Y, 0, 1023, 0, 0);
input_set_abs_params(input_dev, ABS_PRESSURE, 0, 1023, 0, 0);
input_set_drvdata(input_dev, tsi);
/* Disable Pen Detect Circuit */
da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG, 1 << 1, 0);
/* Disable ADC */
da9052_ts_adc_toggle(tsi, false);
error = da9052_request_irq(tsi->da9052, DA9052_IRQ_PENDOWN,
"pendown-irq", da9052_ts_pendwn_irq, tsi);
if (error) {
dev_err(tsi->da9052->dev,
"Failed to register PENDWN IRQ: %d\n", error);
goto err_free_mem;
}
error = da9052_request_irq(tsi->da9052, DA9052_IRQ_TSIREADY,
"tsiready-irq", da9052_ts_datardy_irq, tsi);
if (error) {
dev_err(tsi->da9052->dev,
"Failed to register TSIRDY IRQ :%d\n", error);
goto err_free_pendwn_irq;
}
/* Mask PEN_DOWN and TSI_READY events */
da9052_disable_irq(tsi->da9052, DA9052_IRQ_PENDOWN);
da9052_disable_irq(tsi->da9052, DA9052_IRQ_TSIREADY);
error = da9052_configure_tsi(tsi);
if (error)
goto err_free_datardy_irq;
error = input_register_device(tsi->dev);
if (error)
goto err_free_datardy_irq;
platform_set_drvdata(pdev, tsi);
return 0;
err_free_datardy_irq:
da9052_free_irq(tsi->da9052, DA9052_IRQ_TSIREADY, tsi);
err_free_pendwn_irq:
da9052_free_irq(tsi->da9052, DA9052_IRQ_PENDOWN, tsi);
err_free_mem:
kfree(tsi);
input_free_device(input_dev);
return error;
}
static void da9052_ts_remove(struct platform_device *pdev)
{
struct da9052_tsi *tsi = platform_get_drvdata(pdev);
da9052_reg_write(tsi->da9052, DA9052_LDO9_REG, 0x19);
da9052_free_irq(tsi->da9052, DA9052_IRQ_TSIREADY, tsi);
da9052_free_irq(tsi->da9052, DA9052_IRQ_PENDOWN, tsi);
input_unregister_device(tsi->dev);
kfree(tsi);
}
static struct platform_driver da9052_tsi_driver = {
.probe = da9052_ts_probe,
.remove = da9052_ts_remove,
.driver = {
.name = "da9052-tsi",
},
};
module_platform_driver(da9052_tsi_driver);
MODULE_DESCRIPTION("Touchscreen driver for Dialog Semiconductor DA9052");
MODULE_AUTHOR("Anthony Olech <Anthony.Olech@diasemi.com>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:da9052-tsi");
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