From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- drivers/input/touchscreen/da9052_tsi.c | 342 +++++++++++++++++++++++++++++++++ 1 file changed, 342 insertions(+) create mode 100644 drivers/input/touchscreen/da9052_tsi.c (limited to 'drivers/input/touchscreen/da9052_tsi.c') diff --git a/drivers/input/touchscreen/da9052_tsi.c b/drivers/input/touchscreen/da9052_tsi.c new file mode 100644 index 000000000..f91d0e02d --- /dev/null +++ b/drivers/input/touchscreen/da9052_tsi.c @@ -0,0 +1,342 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * TSI driver for Dialog DA9052 + * + * Copyright(c) 2012 Dialog Semiconductor Ltd. + * + * Author: David Dajun Chen + */ +#include +#include +#include +#include +#include + +#include +#include + +#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 "); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:da9052-tsi"); -- cgit v1.2.3