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529 lines
14 KiB
529 lines
14 KiB
/* |
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* Copyright (C) 2015 Broadcom Corporation |
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* |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License as |
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* published by the Free Software Foundation version 2. |
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* |
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any |
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* kind, whether express or implied; without even the implied warranty |
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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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) { |
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dev_err(&pdev->dev, |
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"failed to register input device: %d\n", error); |
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return error; |
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} |
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return 0; |
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} |
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static const struct of_device_id iproc_ts_of_match[] = { |
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{.compatible = "brcm,iproc-touchscreen", }, |
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{ }, |
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}; |
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MODULE_DEVICE_TABLE(of, iproc_ts_of_match); |
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static struct platform_driver iproc_ts_driver = { |
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.probe = iproc_ts_probe, |
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.driver = { |
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.name = IPROC_TS_NAME, |
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.of_match_table = of_match_ptr(iproc_ts_of_match), |
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}, |
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}; |
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module_platform_driver(iproc_ts_driver); |
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MODULE_DESCRIPTION("IPROC Touchscreen driver"); |
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MODULE_AUTHOR("Broadcom"); |
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MODULE_LICENSE("GPL v2");
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