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569 lines
14 KiB
569 lines
14 KiB
// SPDX-License-Identifier: GPL-2.0 |
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// |
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// Freescale i.MX6UL touchscreen controller driver |
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// |
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// Copyright (C) 2015 Freescale Semiconductor, Inc. |
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#include <linux/errno.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/gpio/consumer.h> |
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#include <linux/input.h> |
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#include <linux/slab.h> |
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#include <linux/completion.h> |
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#include <linux/delay.h> |
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#include <linux/of.h> |
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#include <linux/interrupt.h> |
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#include <linux/platform_device.h> |
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#include <linux/clk.h> |
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#include <linux/io.h> |
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#include <linux/log2.h> |
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/* ADC configuration registers field define */ |
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#define ADC_AIEN (0x1 << 7) |
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#define ADC_CONV_DISABLE 0x1F |
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#define ADC_AVGE (0x1 << 5) |
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#define ADC_CAL (0x1 << 7) |
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#define ADC_CALF 0x2 |
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#define ADC_12BIT_MODE (0x2 << 2) |
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#define ADC_CONV_MODE_MASK (0x3 << 2) |
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#define ADC_IPG_CLK 0x00 |
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#define ADC_INPUT_CLK_MASK 0x3 |
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#define ADC_CLK_DIV_8 (0x03 << 5) |
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#define ADC_CLK_DIV_MASK (0x3 << 5) |
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#define ADC_SHORT_SAMPLE_MODE (0x0 << 4) |
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#define ADC_SAMPLE_MODE_MASK (0x1 << 4) |
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#define ADC_HARDWARE_TRIGGER (0x1 << 13) |
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#define ADC_AVGS_SHIFT 14 |
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#define ADC_AVGS_MASK (0x3 << 14) |
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#define SELECT_CHANNEL_4 0x04 |
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#define SELECT_CHANNEL_1 0x01 |
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#define DISABLE_CONVERSION_INT (0x0 << 7) |
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/* ADC registers */ |
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#define REG_ADC_HC0 0x00 |
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#define REG_ADC_HC1 0x04 |
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#define REG_ADC_HC2 0x08 |
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#define REG_ADC_HC3 0x0C |
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#define REG_ADC_HC4 0x10 |
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#define REG_ADC_HS 0x14 |
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#define REG_ADC_R0 0x18 |
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#define REG_ADC_CFG 0x2C |
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#define REG_ADC_GC 0x30 |
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#define REG_ADC_GS 0x34 |
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#define ADC_TIMEOUT msecs_to_jiffies(100) |
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/* TSC registers */ |
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#define REG_TSC_BASIC_SETING 0x00 |
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#define REG_TSC_PRE_CHARGE_TIME 0x10 |
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#define REG_TSC_FLOW_CONTROL 0x20 |
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#define REG_TSC_MEASURE_VALUE 0x30 |
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#define REG_TSC_INT_EN 0x40 |
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#define REG_TSC_INT_SIG_EN 0x50 |
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#define REG_TSC_INT_STATUS 0x60 |
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#define REG_TSC_DEBUG_MODE 0x70 |
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#define REG_TSC_DEBUG_MODE2 0x80 |
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/* TSC configuration registers field define */ |
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#define DETECT_4_WIRE_MODE (0x0 << 4) |
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#define AUTO_MEASURE 0x1 |
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#define MEASURE_SIGNAL 0x1 |
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#define DETECT_SIGNAL (0x1 << 4) |
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#define VALID_SIGNAL (0x1 << 8) |
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#define MEASURE_INT_EN 0x1 |
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#define MEASURE_SIG_EN 0x1 |
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#define VALID_SIG_EN (0x1 << 8) |
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#define DE_GLITCH_2 (0x2 << 29) |
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#define START_SENSE (0x1 << 12) |
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#define TSC_DISABLE (0x1 << 16) |
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#define DETECT_MODE 0x2 |
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struct imx6ul_tsc { |
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struct device *dev; |
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struct input_dev *input; |
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void __iomem *tsc_regs; |
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void __iomem *adc_regs; |
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struct clk *tsc_clk; |
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struct clk *adc_clk; |
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struct gpio_desc *xnur_gpio; |
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u32 measure_delay_time; |
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u32 pre_charge_time; |
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bool average_enable; |
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u32 average_select; |
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struct completion completion; |
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}; |
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/* |
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* TSC module need ADC to get the measure value. So |
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* before config TSC, we should initialize ADC module. |
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*/ |
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static int imx6ul_adc_init(struct imx6ul_tsc *tsc) |
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{ |
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u32 adc_hc = 0; |
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u32 adc_gc; |
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u32 adc_gs; |
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u32 adc_cfg; |
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unsigned long timeout; |
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reinit_completion(&tsc->completion); |
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adc_cfg = readl(tsc->adc_regs + REG_ADC_CFG); |
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adc_cfg &= ~(ADC_CONV_MODE_MASK | ADC_INPUT_CLK_MASK); |
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adc_cfg |= ADC_12BIT_MODE | ADC_IPG_CLK; |
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adc_cfg &= ~(ADC_CLK_DIV_MASK | ADC_SAMPLE_MODE_MASK); |
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adc_cfg |= ADC_CLK_DIV_8 | ADC_SHORT_SAMPLE_MODE; |
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if (tsc->average_enable) { |
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adc_cfg &= ~ADC_AVGS_MASK; |
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adc_cfg |= (tsc->average_select) << ADC_AVGS_SHIFT; |
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} |
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adc_cfg &= ~ADC_HARDWARE_TRIGGER; |
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writel(adc_cfg, tsc->adc_regs + REG_ADC_CFG); |
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/* enable calibration interrupt */ |
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adc_hc |= ADC_AIEN; |
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adc_hc |= ADC_CONV_DISABLE; |
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writel(adc_hc, tsc->adc_regs + REG_ADC_HC0); |
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/* start ADC calibration */ |
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adc_gc = readl(tsc->adc_regs + REG_ADC_GC); |
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adc_gc |= ADC_CAL; |
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if (tsc->average_enable) |
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adc_gc |= ADC_AVGE; |
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writel(adc_gc, tsc->adc_regs + REG_ADC_GC); |
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timeout = wait_for_completion_timeout |
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(&tsc->completion, ADC_TIMEOUT); |
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if (timeout == 0) { |
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dev_err(tsc->dev, "Timeout for adc calibration\n"); |
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return -ETIMEDOUT; |
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} |
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adc_gs = readl(tsc->adc_regs + REG_ADC_GS); |
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if (adc_gs & ADC_CALF) { |
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dev_err(tsc->dev, "ADC calibration failed\n"); |
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return -EINVAL; |
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} |
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/* TSC need the ADC work in hardware trigger */ |
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adc_cfg = readl(tsc->adc_regs + REG_ADC_CFG); |
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adc_cfg |= ADC_HARDWARE_TRIGGER; |
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writel(adc_cfg, tsc->adc_regs + REG_ADC_CFG); |
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return 0; |
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} |
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/* |
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* This is a TSC workaround. Currently TSC misconnect two |
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* ADC channels, this function remap channel configure for |
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* hardware trigger. |
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*/ |
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static void imx6ul_tsc_channel_config(struct imx6ul_tsc *tsc) |
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{ |
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u32 adc_hc0, adc_hc1, adc_hc2, adc_hc3, adc_hc4; |
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adc_hc0 = DISABLE_CONVERSION_INT; |
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writel(adc_hc0, tsc->adc_regs + REG_ADC_HC0); |
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adc_hc1 = DISABLE_CONVERSION_INT | SELECT_CHANNEL_4; |
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writel(adc_hc1, tsc->adc_regs + REG_ADC_HC1); |
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adc_hc2 = DISABLE_CONVERSION_INT; |
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writel(adc_hc2, tsc->adc_regs + REG_ADC_HC2); |
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adc_hc3 = DISABLE_CONVERSION_INT | SELECT_CHANNEL_1; |
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writel(adc_hc3, tsc->adc_regs + REG_ADC_HC3); |
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adc_hc4 = DISABLE_CONVERSION_INT; |
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writel(adc_hc4, tsc->adc_regs + REG_ADC_HC4); |
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} |
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/* |
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* TSC setting, confige the pre-charge time and measure delay time. |
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* different touch screen may need different pre-charge time and |
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* measure delay time. |
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*/ |
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static void imx6ul_tsc_set(struct imx6ul_tsc *tsc) |
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{ |
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u32 basic_setting = 0; |
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u32 start; |
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basic_setting |= tsc->measure_delay_time << 8; |
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basic_setting |= DETECT_4_WIRE_MODE | AUTO_MEASURE; |
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writel(basic_setting, tsc->tsc_regs + REG_TSC_BASIC_SETING); |
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writel(DE_GLITCH_2, tsc->tsc_regs + REG_TSC_DEBUG_MODE2); |
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writel(tsc->pre_charge_time, tsc->tsc_regs + REG_TSC_PRE_CHARGE_TIME); |
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writel(MEASURE_INT_EN, tsc->tsc_regs + REG_TSC_INT_EN); |
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writel(MEASURE_SIG_EN | VALID_SIG_EN, |
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tsc->tsc_regs + REG_TSC_INT_SIG_EN); |
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/* start sense detection */ |
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start = readl(tsc->tsc_regs + REG_TSC_FLOW_CONTROL); |
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start |= START_SENSE; |
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start &= ~TSC_DISABLE; |
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writel(start, tsc->tsc_regs + REG_TSC_FLOW_CONTROL); |
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} |
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static int imx6ul_tsc_init(struct imx6ul_tsc *tsc) |
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{ |
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int err; |
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err = imx6ul_adc_init(tsc); |
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if (err) |
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return err; |
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imx6ul_tsc_channel_config(tsc); |
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imx6ul_tsc_set(tsc); |
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return 0; |
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} |
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static void imx6ul_tsc_disable(struct imx6ul_tsc *tsc) |
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{ |
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u32 tsc_flow; |
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u32 adc_cfg; |
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/* TSC controller enters to idle status */ |
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tsc_flow = readl(tsc->tsc_regs + REG_TSC_FLOW_CONTROL); |
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tsc_flow |= TSC_DISABLE; |
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writel(tsc_flow, tsc->tsc_regs + REG_TSC_FLOW_CONTROL); |
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/* ADC controller enters to stop mode */ |
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adc_cfg = readl(tsc->adc_regs + REG_ADC_HC0); |
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adc_cfg |= ADC_CONV_DISABLE; |
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writel(adc_cfg, tsc->adc_regs + REG_ADC_HC0); |
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} |
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/* Delay some time (max 2ms), wait the pre-charge done. */ |
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static bool tsc_wait_detect_mode(struct imx6ul_tsc *tsc) |
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{ |
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unsigned long timeout = jiffies + msecs_to_jiffies(2); |
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u32 state_machine; |
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u32 debug_mode2; |
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do { |
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if (time_after(jiffies, timeout)) |
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return false; |
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usleep_range(200, 400); |
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debug_mode2 = readl(tsc->tsc_regs + REG_TSC_DEBUG_MODE2); |
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state_machine = (debug_mode2 >> 20) & 0x7; |
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} while (state_machine != DETECT_MODE); |
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usleep_range(200, 400); |
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return true; |
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} |
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static irqreturn_t tsc_irq_fn(int irq, void *dev_id) |
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{ |
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struct imx6ul_tsc *tsc = dev_id; |
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u32 status; |
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u32 value; |
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u32 x, y; |
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u32 start; |
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status = readl(tsc->tsc_regs + REG_TSC_INT_STATUS); |
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/* write 1 to clear the bit measure-signal */ |
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writel(MEASURE_SIGNAL | DETECT_SIGNAL, |
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tsc->tsc_regs + REG_TSC_INT_STATUS); |
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/* It's a HW self-clean bit. Set this bit and start sense detection */ |
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start = readl(tsc->tsc_regs + REG_TSC_FLOW_CONTROL); |
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start |= START_SENSE; |
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writel(start, tsc->tsc_regs + REG_TSC_FLOW_CONTROL); |
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if (status & MEASURE_SIGNAL) { |
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value = readl(tsc->tsc_regs + REG_TSC_MEASURE_VALUE); |
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x = (value >> 16) & 0x0fff; |
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y = value & 0x0fff; |
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/* |
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* In detect mode, we can get the xnur gpio value, |
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* otherwise assume contact is stiull active. |
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*/ |
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if (!tsc_wait_detect_mode(tsc) || |
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gpiod_get_value_cansleep(tsc->xnur_gpio)) { |
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input_report_key(tsc->input, BTN_TOUCH, 1); |
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input_report_abs(tsc->input, ABS_X, x); |
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input_report_abs(tsc->input, ABS_Y, y); |
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} else { |
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input_report_key(tsc->input, BTN_TOUCH, 0); |
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} |
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input_sync(tsc->input); |
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} |
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return IRQ_HANDLED; |
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} |
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static irqreturn_t adc_irq_fn(int irq, void *dev_id) |
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{ |
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struct imx6ul_tsc *tsc = dev_id; |
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u32 coco; |
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coco = readl(tsc->adc_regs + REG_ADC_HS); |
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if (coco & 0x01) { |
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readl(tsc->adc_regs + REG_ADC_R0); |
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complete(&tsc->completion); |
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} |
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return IRQ_HANDLED; |
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} |
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static int imx6ul_tsc_start(struct imx6ul_tsc *tsc) |
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{ |
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int err; |
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err = clk_prepare_enable(tsc->adc_clk); |
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if (err) { |
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dev_err(tsc->dev, |
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"Could not prepare or enable the adc clock: %d\n", |
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err); |
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return err; |
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} |
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err = clk_prepare_enable(tsc->tsc_clk); |
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if (err) { |
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dev_err(tsc->dev, |
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"Could not prepare or enable the tsc clock: %d\n", |
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err); |
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goto disable_adc_clk; |
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} |
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err = imx6ul_tsc_init(tsc); |
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if (err) |
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goto disable_tsc_clk; |
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return 0; |
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disable_tsc_clk: |
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clk_disable_unprepare(tsc->tsc_clk); |
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disable_adc_clk: |
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clk_disable_unprepare(tsc->adc_clk); |
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return err; |
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} |
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static void imx6ul_tsc_stop(struct imx6ul_tsc *tsc) |
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{ |
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imx6ul_tsc_disable(tsc); |
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clk_disable_unprepare(tsc->tsc_clk); |
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clk_disable_unprepare(tsc->adc_clk); |
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} |
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static int imx6ul_tsc_open(struct input_dev *input_dev) |
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{ |
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struct imx6ul_tsc *tsc = input_get_drvdata(input_dev); |
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return imx6ul_tsc_start(tsc); |
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} |
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static void imx6ul_tsc_close(struct input_dev *input_dev) |
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{ |
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struct imx6ul_tsc *tsc = input_get_drvdata(input_dev); |
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imx6ul_tsc_stop(tsc); |
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} |
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static int imx6ul_tsc_probe(struct platform_device *pdev) |
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{ |
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struct device_node *np = pdev->dev.of_node; |
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struct imx6ul_tsc *tsc; |
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struct input_dev *input_dev; |
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int err; |
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int tsc_irq; |
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int adc_irq; |
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u32 average_samples; |
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tsc = devm_kzalloc(&pdev->dev, sizeof(*tsc), GFP_KERNEL); |
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if (!tsc) |
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return -ENOMEM; |
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input_dev = devm_input_allocate_device(&pdev->dev); |
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if (!input_dev) |
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return -ENOMEM; |
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input_dev->name = "iMX6UL Touchscreen Controller"; |
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input_dev->id.bustype = BUS_HOST; |
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input_dev->open = imx6ul_tsc_open; |
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input_dev->close = imx6ul_tsc_close; |
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input_set_capability(input_dev, EV_KEY, BTN_TOUCH); |
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input_set_abs_params(input_dev, ABS_X, 0, 0xFFF, 0, 0); |
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input_set_abs_params(input_dev, ABS_Y, 0, 0xFFF, 0, 0); |
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input_set_drvdata(input_dev, tsc); |
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tsc->dev = &pdev->dev; |
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tsc->input = input_dev; |
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init_completion(&tsc->completion); |
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tsc->xnur_gpio = devm_gpiod_get(&pdev->dev, "xnur", GPIOD_IN); |
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if (IS_ERR(tsc->xnur_gpio)) { |
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err = PTR_ERR(tsc->xnur_gpio); |
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dev_err(&pdev->dev, |
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"failed to request GPIO tsc_X- (xnur): %d\n", err); |
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return err; |
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} |
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tsc->tsc_regs = devm_platform_ioremap_resource(pdev, 0); |
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if (IS_ERR(tsc->tsc_regs)) { |
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err = PTR_ERR(tsc->tsc_regs); |
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dev_err(&pdev->dev, "failed to remap tsc memory: %d\n", err); |
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return err; |
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} |
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tsc->adc_regs = devm_platform_ioremap_resource(pdev, 1); |
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if (IS_ERR(tsc->adc_regs)) { |
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err = PTR_ERR(tsc->adc_regs); |
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dev_err(&pdev->dev, "failed to remap adc memory: %d\n", err); |
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return err; |
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} |
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tsc->tsc_clk = devm_clk_get(&pdev->dev, "tsc"); |
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if (IS_ERR(tsc->tsc_clk)) { |
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err = PTR_ERR(tsc->tsc_clk); |
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dev_err(&pdev->dev, "failed getting tsc clock: %d\n", err); |
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return err; |
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} |
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tsc->adc_clk = devm_clk_get(&pdev->dev, "adc"); |
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if (IS_ERR(tsc->adc_clk)) { |
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err = PTR_ERR(tsc->adc_clk); |
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dev_err(&pdev->dev, "failed getting adc clock: %d\n", err); |
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return err; |
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} |
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tsc_irq = platform_get_irq(pdev, 0); |
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if (tsc_irq < 0) |
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return tsc_irq; |
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adc_irq = platform_get_irq(pdev, 1); |
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if (adc_irq < 0) |
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return adc_irq; |
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err = devm_request_threaded_irq(tsc->dev, tsc_irq, |
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NULL, tsc_irq_fn, IRQF_ONESHOT, |
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dev_name(&pdev->dev), tsc); |
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if (err) { |
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dev_err(&pdev->dev, |
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"failed requesting tsc irq %d: %d\n", |
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tsc_irq, err); |
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return err; |
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} |
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err = devm_request_irq(tsc->dev, adc_irq, adc_irq_fn, 0, |
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dev_name(&pdev->dev), tsc); |
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if (err) { |
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dev_err(&pdev->dev, |
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"failed requesting adc irq %d: %d\n", |
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adc_irq, err); |
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return err; |
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} |
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err = of_property_read_u32(np, "measure-delay-time", |
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&tsc->measure_delay_time); |
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if (err) |
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tsc->measure_delay_time = 0xffff; |
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err = of_property_read_u32(np, "pre-charge-time", |
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&tsc->pre_charge_time); |
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if (err) |
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tsc->pre_charge_time = 0xfff; |
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|
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err = of_property_read_u32(np, "touchscreen-average-samples", |
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&average_samples); |
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if (err) |
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average_samples = 1; |
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switch (average_samples) { |
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case 1: |
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tsc->average_enable = false; |
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tsc->average_select = 0; /* value unused; initialize anyway */ |
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break; |
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case 4: |
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case 8: |
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case 16: |
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case 32: |
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tsc->average_enable = true; |
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tsc->average_select = ilog2(average_samples) - 2; |
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break; |
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default: |
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dev_err(&pdev->dev, |
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"touchscreen-average-samples (%u) must be 1, 4, 8, 16 or 32\n", |
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average_samples); |
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return -EINVAL; |
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} |
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|
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err = input_register_device(tsc->input); |
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if (err) { |
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dev_err(&pdev->dev, |
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"failed to register input device: %d\n", err); |
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return err; |
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} |
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|
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platform_set_drvdata(pdev, tsc); |
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return 0; |
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} |
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static int __maybe_unused imx6ul_tsc_suspend(struct device *dev) |
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{ |
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struct platform_device *pdev = to_platform_device(dev); |
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struct imx6ul_tsc *tsc = platform_get_drvdata(pdev); |
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struct input_dev *input_dev = tsc->input; |
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|
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mutex_lock(&input_dev->mutex); |
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|
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if (input_device_enabled(input_dev)) |
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imx6ul_tsc_stop(tsc); |
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|
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mutex_unlock(&input_dev->mutex); |
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|
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return 0; |
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} |
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|
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static int __maybe_unused imx6ul_tsc_resume(struct device *dev) |
|
{ |
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struct platform_device *pdev = to_platform_device(dev); |
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struct imx6ul_tsc *tsc = platform_get_drvdata(pdev); |
|
struct input_dev *input_dev = tsc->input; |
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int retval = 0; |
|
|
|
mutex_lock(&input_dev->mutex); |
|
|
|
if (input_device_enabled(input_dev)) |
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retval = imx6ul_tsc_start(tsc); |
|
|
|
mutex_unlock(&input_dev->mutex); |
|
|
|
return retval; |
|
} |
|
|
|
static SIMPLE_DEV_PM_OPS(imx6ul_tsc_pm_ops, |
|
imx6ul_tsc_suspend, imx6ul_tsc_resume); |
|
|
|
static const struct of_device_id imx6ul_tsc_match[] = { |
|
{ .compatible = "fsl,imx6ul-tsc", }, |
|
{ /* sentinel */ } |
|
}; |
|
MODULE_DEVICE_TABLE(of, imx6ul_tsc_match); |
|
|
|
static struct platform_driver imx6ul_tsc_driver = { |
|
.driver = { |
|
.name = "imx6ul-tsc", |
|
.of_match_table = imx6ul_tsc_match, |
|
.pm = &imx6ul_tsc_pm_ops, |
|
}, |
|
.probe = imx6ul_tsc_probe, |
|
}; |
|
module_platform_driver(imx6ul_tsc_driver); |
|
|
|
MODULE_AUTHOR("Haibo Chen <[email protected]>"); |
|
MODULE_DESCRIPTION("Freescale i.MX6UL Touchscreen controller driver"); |
|
MODULE_LICENSE("GPL v2");
|
|
|