forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
342 lines
8.1 KiB
342 lines
8.1 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
|
* TSI driver for Dialog DA9052 |
|
* |
|
* Copyright(c) 2012 Dialog Semiconductor Ltd. |
|
* |
|
* Author: David Dajun Chen <[email protected]> |
|
*/ |
|
#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(sizeof(struct da9052_tsi), GFP_KERNEL); |
|
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 int 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); |
|
|
|
return 0; |
|
} |
|
|
|
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 <[email protected]>"); |
|
MODULE_LICENSE("GPL"); |
|
MODULE_ALIAS("platform:da9052-tsi");
|
|
|