/* * TSI driver for Dialog DA9052 * * Copyright(c) 2012 Dialog Semiconductor Ltd. * * Author: David Dajun Chen * * 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. * */ #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; struct mutex mutex; 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");