--- /dev/null
+/*
+ * TSI driver for Dialog DA9052
+ *
+ * Copyright(c) 2012 Dialog Semiconductor Ltd.
+ *
+ * Author: David Dajun Chen <dchen@diasemi.com>
+ *
+ * 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 <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;
+ 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 <Anthony.Olech@diasemi.com>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:da9052-tsi");
Code Review / kvmfornfv.git / blobdiff