523 lines
13 KiB
C
523 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2015 Broadcom Corporation
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*
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/input.h>
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <linux/keyboard.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/of.h>
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#include <asm/irq.h>
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#include <linux/io.h>
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#include <linux/clk.h>
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#include <linux/serio.h>
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#include <linux/mfd/syscon.h>
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#include <linux/regmap.h>
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#define IPROC_TS_NAME "iproc-ts"
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#define PEN_DOWN_STATUS 1
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#define PEN_UP_STATUS 0
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#define X_MIN 0
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#define Y_MIN 0
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#define X_MAX 0xFFF
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#define Y_MAX 0xFFF
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/* Value given by controller for invalid coordinate. */
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#define INVALID_COORD 0xFFFFFFFF
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/* Register offsets */
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#define REGCTL1 0x00
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#define REGCTL2 0x04
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#define INTERRUPT_THRES 0x08
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#define INTERRUPT_MASK 0x0c
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#define INTERRUPT_STATUS 0x10
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#define CONTROLLER_STATUS 0x14
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#define FIFO_DATA 0x18
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#define FIFO_DATA_X_Y_MASK 0xFFFF
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#define ANALOG_CONTROL 0x1c
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#define AUX_DATA 0x20
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#define DEBOUNCE_CNTR_STAT 0x24
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#define SCAN_CNTR_STAT 0x28
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#define REM_CNTR_STAT 0x2c
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#define SETTLING_TIMER_STAT 0x30
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#define SPARE_REG 0x34
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#define SOFT_BYPASS_CONTROL 0x38
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#define SOFT_BYPASS_DATA 0x3c
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/* Bit values for INTERRUPT_MASK and INTERRUPT_STATUS regs */
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#define TS_PEN_INTR_MASK BIT(0)
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#define TS_FIFO_INTR_MASK BIT(2)
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/* Bit values for CONTROLLER_STATUS reg1 */
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#define TS_PEN_DOWN BIT(0)
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/* Shift values for control reg1 */
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#define SCANNING_PERIOD_SHIFT 24
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#define DEBOUNCE_TIMEOUT_SHIFT 16
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#define SETTLING_TIMEOUT_SHIFT 8
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#define TOUCH_TIMEOUT_SHIFT 0
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/* Shift values for coordinates from fifo */
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#define X_COORD_SHIFT 0
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#define Y_COORD_SHIFT 16
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/* Bit values for REGCTL2 */
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#define TS_CONTROLLER_EN_BIT BIT(16)
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#define TS_CONTROLLER_AVGDATA_SHIFT 8
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#define TS_CONTROLLER_AVGDATA_MASK (0x7 << TS_CONTROLLER_AVGDATA_SHIFT)
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#define TS_CONTROLLER_PWR_LDO BIT(5)
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#define TS_CONTROLLER_PWR_ADC BIT(4)
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#define TS_CONTROLLER_PWR_BGP BIT(3)
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#define TS_CONTROLLER_PWR_TS BIT(2)
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#define TS_WIRE_MODE_BIT BIT(1)
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#define dbg_reg(dev, priv, reg) \
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do { \
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u32 val; \
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regmap_read(priv->regmap, reg, &val); \
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dev_dbg(dev, "%20s= 0x%08x\n", #reg, val); \
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} while (0)
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struct tsc_param {
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/* Each step is 1024 us. Valid 1-256 */
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u32 scanning_period;
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/* Each step is 512 us. Valid 0-255 */
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u32 debounce_timeout;
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/*
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* The settling duration (in ms) is the amount of time the tsc
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* waits to allow the voltage to settle after turning on the
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* drivers in detection mode. Valid values: 0-11
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* 0 = 0.008 ms
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* 1 = 0.01 ms
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* 2 = 0.02 ms
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* 3 = 0.04 ms
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* 4 = 0.08 ms
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* 5 = 0.16 ms
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* 6 = 0.32 ms
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* 7 = 0.64 ms
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* 8 = 1.28 ms
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* 9 = 2.56 ms
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* 10 = 5.12 ms
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* 11 = 10.24 ms
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*/
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u32 settling_timeout;
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/* touch timeout in sample counts */
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u32 touch_timeout;
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/*
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* Number of data samples which are averaged before a final data point
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* is placed into the FIFO
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*/
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u32 average_data;
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/* FIFO threshold */
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u32 fifo_threshold;
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/* Optional standard touchscreen properties. */
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u32 max_x;
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u32 max_y;
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u32 fuzz_x;
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u32 fuzz_y;
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bool invert_x;
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bool invert_y;
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};
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struct iproc_ts_priv {
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struct platform_device *pdev;
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struct input_dev *idev;
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struct regmap *regmap;
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struct clk *tsc_clk;
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int pen_status;
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struct tsc_param cfg_params;
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};
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/*
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* Set default values the same as hardware reset values
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* except for fifo_threshold with is set to 1.
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*/
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static const struct tsc_param iproc_default_config = {
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.scanning_period = 0x5, /* 1 to 256 */
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.debounce_timeout = 0x28, /* 0 to 255 */
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.settling_timeout = 0x7, /* 0 to 11 */
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.touch_timeout = 0xa, /* 0 to 255 */
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.average_data = 5, /* entry 5 = 32 pts */
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.fifo_threshold = 1, /* 0 to 31 */
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.max_x = X_MAX,
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.max_y = Y_MAX,
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};
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static void ts_reg_dump(struct iproc_ts_priv *priv)
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{
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struct device *dev = &priv->pdev->dev;
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dbg_reg(dev, priv, REGCTL1);
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dbg_reg(dev, priv, REGCTL2);
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dbg_reg(dev, priv, INTERRUPT_THRES);
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dbg_reg(dev, priv, INTERRUPT_MASK);
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dbg_reg(dev, priv, INTERRUPT_STATUS);
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dbg_reg(dev, priv, CONTROLLER_STATUS);
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dbg_reg(dev, priv, FIFO_DATA);
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dbg_reg(dev, priv, ANALOG_CONTROL);
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dbg_reg(dev, priv, AUX_DATA);
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dbg_reg(dev, priv, DEBOUNCE_CNTR_STAT);
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dbg_reg(dev, priv, SCAN_CNTR_STAT);
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dbg_reg(dev, priv, REM_CNTR_STAT);
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dbg_reg(dev, priv, SETTLING_TIMER_STAT);
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dbg_reg(dev, priv, SPARE_REG);
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dbg_reg(dev, priv, SOFT_BYPASS_CONTROL);
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dbg_reg(dev, priv, SOFT_BYPASS_DATA);
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}
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static irqreturn_t iproc_touchscreen_interrupt(int irq, void *data)
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{
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struct platform_device *pdev = data;
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struct iproc_ts_priv *priv = platform_get_drvdata(pdev);
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u32 intr_status;
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u32 raw_coordinate;
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u16 x;
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u16 y;
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int i;
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bool needs_sync = false;
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regmap_read(priv->regmap, INTERRUPT_STATUS, &intr_status);
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intr_status &= TS_PEN_INTR_MASK | TS_FIFO_INTR_MASK;
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if (intr_status == 0)
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return IRQ_NONE;
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/* Clear all interrupt status bits, write-1-clear */
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regmap_write(priv->regmap, INTERRUPT_STATUS, intr_status);
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/* Pen up/down */
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if (intr_status & TS_PEN_INTR_MASK) {
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regmap_read(priv->regmap, CONTROLLER_STATUS, &priv->pen_status);
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if (priv->pen_status & TS_PEN_DOWN)
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priv->pen_status = PEN_DOWN_STATUS;
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else
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priv->pen_status = PEN_UP_STATUS;
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input_report_key(priv->idev, BTN_TOUCH, priv->pen_status);
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needs_sync = true;
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dev_dbg(&priv->pdev->dev,
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"pen up-down (%d)\n", priv->pen_status);
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}
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/* coordinates in FIFO exceed the theshold */
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if (intr_status & TS_FIFO_INTR_MASK) {
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for (i = 0; i < priv->cfg_params.fifo_threshold; i++) {
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regmap_read(priv->regmap, FIFO_DATA, &raw_coordinate);
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if (raw_coordinate == INVALID_COORD)
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continue;
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/*
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* The x and y coordinate are 16 bits each
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* with the x in the lower 16 bits and y in the
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* upper 16 bits.
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*/
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x = (raw_coordinate >> X_COORD_SHIFT) &
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FIFO_DATA_X_Y_MASK;
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y = (raw_coordinate >> Y_COORD_SHIFT) &
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FIFO_DATA_X_Y_MASK;
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/* We only want to retain the 12 msb of the 16 */
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x = (x >> 4) & 0x0FFF;
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y = (y >> 4) & 0x0FFF;
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/* Adjust x y according to LCD tsc mount angle. */
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if (priv->cfg_params.invert_x)
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x = priv->cfg_params.max_x - x;
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if (priv->cfg_params.invert_y)
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y = priv->cfg_params.max_y - y;
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input_report_abs(priv->idev, ABS_X, x);
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input_report_abs(priv->idev, ABS_Y, y);
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needs_sync = true;
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dev_dbg(&priv->pdev->dev, "xy (0x%x 0x%x)\n", x, y);
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}
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}
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if (needs_sync)
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input_sync(priv->idev);
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return IRQ_HANDLED;
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}
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static int iproc_ts_start(struct input_dev *idev)
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{
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u32 val;
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u32 mask;
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int error;
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struct iproc_ts_priv *priv = input_get_drvdata(idev);
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/* Enable clock */
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error = clk_prepare_enable(priv->tsc_clk);
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if (error) {
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dev_err(&priv->pdev->dev, "%s clk_prepare_enable failed %d\n",
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__func__, error);
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return error;
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}
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/*
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* Interrupt is generated when:
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* FIFO reaches the int_th value, and pen event(up/down)
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*/
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val = TS_PEN_INTR_MASK | TS_FIFO_INTR_MASK;
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regmap_update_bits(priv->regmap, INTERRUPT_MASK, val, val);
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val = priv->cfg_params.fifo_threshold;
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regmap_write(priv->regmap, INTERRUPT_THRES, val);
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/* Initialize control reg1 */
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val = 0;
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val |= priv->cfg_params.scanning_period << SCANNING_PERIOD_SHIFT;
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val |= priv->cfg_params.debounce_timeout << DEBOUNCE_TIMEOUT_SHIFT;
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val |= priv->cfg_params.settling_timeout << SETTLING_TIMEOUT_SHIFT;
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val |= priv->cfg_params.touch_timeout << TOUCH_TIMEOUT_SHIFT;
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regmap_write(priv->regmap, REGCTL1, val);
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/* Try to clear all interrupt status */
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val = TS_FIFO_INTR_MASK | TS_PEN_INTR_MASK;
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regmap_update_bits(priv->regmap, INTERRUPT_STATUS, val, val);
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/* Initialize control reg2 */
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val = TS_CONTROLLER_EN_BIT | TS_WIRE_MODE_BIT;
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val |= priv->cfg_params.average_data << TS_CONTROLLER_AVGDATA_SHIFT;
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mask = (TS_CONTROLLER_AVGDATA_MASK);
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mask |= (TS_CONTROLLER_PWR_LDO | /* PWR up LDO */
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TS_CONTROLLER_PWR_ADC | /* PWR up ADC */
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TS_CONTROLLER_PWR_BGP | /* PWR up BGP */
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TS_CONTROLLER_PWR_TS); /* PWR up TS */
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mask |= val;
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regmap_update_bits(priv->regmap, REGCTL2, mask, val);
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ts_reg_dump(priv);
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return 0;
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}
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static void iproc_ts_stop(struct input_dev *dev)
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{
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u32 val;
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struct iproc_ts_priv *priv = input_get_drvdata(dev);
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/*
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* Disable FIFO int_th and pen event(up/down)Interrupts only
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* as the interrupt mask register is shared between ADC, TS and
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* flextimer.
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*/
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val = TS_PEN_INTR_MASK | TS_FIFO_INTR_MASK;
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regmap_update_bits(priv->regmap, INTERRUPT_MASK, val, 0);
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/* Only power down touch screen controller */
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val = TS_CONTROLLER_PWR_TS;
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regmap_update_bits(priv->regmap, REGCTL2, val, val);
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clk_disable(priv->tsc_clk);
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}
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static int iproc_get_tsc_config(struct device *dev, struct iproc_ts_priv *priv)
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{
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struct device_node *np = dev->of_node;
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u32 val;
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priv->cfg_params = iproc_default_config;
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if (!np)
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return 0;
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if (of_property_read_u32(np, "scanning_period", &val) >= 0) {
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if (val < 1 || val > 256) {
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dev_err(dev, "scanning_period (%u) must be [1-256]\n",
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val);
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return -EINVAL;
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}
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priv->cfg_params.scanning_period = val;
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}
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if (of_property_read_u32(np, "debounce_timeout", &val) >= 0) {
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if (val > 255) {
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dev_err(dev, "debounce_timeout (%u) must be [0-255]\n",
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val);
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return -EINVAL;
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}
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priv->cfg_params.debounce_timeout = val;
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}
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if (of_property_read_u32(np, "settling_timeout", &val) >= 0) {
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if (val > 11) {
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dev_err(dev, "settling_timeout (%u) must be [0-11]\n",
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val);
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return -EINVAL;
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}
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priv->cfg_params.settling_timeout = val;
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}
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if (of_property_read_u32(np, "touch_timeout", &val) >= 0) {
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if (val > 255) {
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dev_err(dev, "touch_timeout (%u) must be [0-255]\n",
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val);
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return -EINVAL;
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}
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priv->cfg_params.touch_timeout = val;
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}
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if (of_property_read_u32(np, "average_data", &val) >= 0) {
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if (val > 8) {
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dev_err(dev, "average_data (%u) must be [0-8]\n", val);
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return -EINVAL;
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}
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priv->cfg_params.average_data = val;
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}
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if (of_property_read_u32(np, "fifo_threshold", &val) >= 0) {
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if (val > 31) {
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dev_err(dev, "fifo_threshold (%u)) must be [0-31]\n",
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val);
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return -EINVAL;
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}
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priv->cfg_params.fifo_threshold = val;
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}
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/* Parse optional properties. */
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of_property_read_u32(np, "touchscreen-size-x", &priv->cfg_params.max_x);
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of_property_read_u32(np, "touchscreen-size-y", &priv->cfg_params.max_y);
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of_property_read_u32(np, "touchscreen-fuzz-x",
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&priv->cfg_params.fuzz_x);
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of_property_read_u32(np, "touchscreen-fuzz-y",
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&priv->cfg_params.fuzz_y);
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priv->cfg_params.invert_x =
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of_property_read_bool(np, "touchscreen-inverted-x");
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priv->cfg_params.invert_y =
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of_property_read_bool(np, "touchscreen-inverted-y");
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return 0;
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}
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static int iproc_ts_probe(struct platform_device *pdev)
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{
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struct iproc_ts_priv *priv;
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struct input_dev *idev;
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int irq;
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int error;
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priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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/* touchscreen controller memory mapped regs via syscon*/
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priv->regmap = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
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"ts_syscon");
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if (IS_ERR(priv->regmap)) {
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error = PTR_ERR(priv->regmap);
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dev_err(&pdev->dev, "unable to map I/O memory:%d\n", error);
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return error;
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}
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priv->tsc_clk = devm_clk_get(&pdev->dev, "tsc_clk");
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if (IS_ERR(priv->tsc_clk)) {
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error = PTR_ERR(priv->tsc_clk);
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dev_err(&pdev->dev,
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"failed getting clock tsc_clk: %d\n", error);
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return error;
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}
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priv->pdev = pdev;
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error = iproc_get_tsc_config(&pdev->dev, priv);
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if (error) {
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dev_err(&pdev->dev, "get_tsc_config failed: %d\n", error);
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return error;
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}
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idev = devm_input_allocate_device(&pdev->dev);
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if (!idev) {
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dev_err(&pdev->dev, "failed to allocate input device\n");
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return -ENOMEM;
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}
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priv->idev = idev;
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priv->pen_status = PEN_UP_STATUS;
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/* Set input device info */
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idev->name = IPROC_TS_NAME;
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idev->dev.parent = &pdev->dev;
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idev->id.bustype = BUS_HOST;
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idev->id.vendor = SERIO_UNKNOWN;
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idev->id.product = 0;
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idev->id.version = 0;
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idev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
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__set_bit(BTN_TOUCH, idev->keybit);
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input_set_abs_params(idev, ABS_X, X_MIN, priv->cfg_params.max_x,
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priv->cfg_params.fuzz_x, 0);
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input_set_abs_params(idev, ABS_Y, Y_MIN, priv->cfg_params.max_y,
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priv->cfg_params.fuzz_y, 0);
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idev->open = iproc_ts_start;
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idev->close = iproc_ts_stop;
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input_set_drvdata(idev, priv);
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platform_set_drvdata(pdev, priv);
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/* get interrupt */
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irq = platform_get_irq(pdev, 0);
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if (irq < 0)
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return irq;
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error = devm_request_irq(&pdev->dev, irq,
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iproc_touchscreen_interrupt,
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IRQF_SHARED, IPROC_TS_NAME, pdev);
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if (error)
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return error;
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error = input_register_device(priv->idev);
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if (error) {
|
|
dev_err(&pdev->dev,
|
|
"failed to register input device: %d\n", error);
|
|
return error;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id iproc_ts_of_match[] = {
|
|
{.compatible = "brcm,iproc-touchscreen", },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, iproc_ts_of_match);
|
|
|
|
static struct platform_driver iproc_ts_driver = {
|
|
.probe = iproc_ts_probe,
|
|
.driver = {
|
|
.name = IPROC_TS_NAME,
|
|
.of_match_table = iproc_ts_of_match,
|
|
},
|
|
};
|
|
|
|
module_platform_driver(iproc_ts_driver);
|
|
|
|
MODULE_DESCRIPTION("IPROC Touchscreen driver");
|
|
MODULE_AUTHOR("Broadcom");
|
|
MODULE_LICENSE("GPL v2");
|