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