Input: add Broadcom iProc touchscreen driver
Add initial version of the Broadcom touchscreen driver. Reviewed-by: Ray Jui <rjui@broadcom.com> Reviewed-by: Scott Branden <sbranden@broadcom.com> Tested-by: Scott Branden <sbranden@broadcom.com> Signed-off-by: Jonathan Richardson <jonathar@broadcom.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Jonathan Richardson
Dmitry Torokhov
parent
188933ac13
commit
d5ae685f15
4 changed files with 611 additions and 0 deletions
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@ -0,0 +1,76 @@
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* Broadcom's IPROC Touchscreen Controller
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Required properties:
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- compatible: must be "brcm,iproc-touchscreen"
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- reg: physical base address of the controller and length of memory mapped
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region.
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- clocks: The clock provided by the SOC to driver the tsc
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- clock-name: name for the clock
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- interrupts: The touchscreen controller's interrupt
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Optional properties:
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- scanning_period: Time between scans. Each step is 1024 us. Valid 1-256.
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- debounce_timeout: Each step is 512 us. Valid 0-255
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- settling_timeout: The settling duration (in ms) is the amount of time
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the tsc waits to allow the voltage to settle after
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turning on the drivers in detection mode.
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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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- touch_timeout: The continuous number of scan periods in which touch is
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not detected before the controller returns to idle state.
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Valid values 0-255.
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- average_data: Number of data samples which are averaged before a final
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data point is placed into the FIFO
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Valid values 0-7
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0 = 1 sample
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1 = 2 samples
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2 = 4 samples
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3 = 8 samples
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4 = 16 samples
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5 = 32 samples
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6 = 64 samples
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7 = 128 samples
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- fifo_threshold: Interrupt is generated whenever the number of fifo
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entries exceeds this value
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Valid values 0-31
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- touchscreen-size-x: horizontal resolution of touchscreen (in pixels)
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- touchscreen-size-y: vertical resolution of touchscreen (in pixels)
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- touchscreen-fuzz-x: horizontal noise value of the absolute input
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device (in pixels)
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- touchscreen-fuzz-y: vertical noise value of the absolute input
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device (in pixels)
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- touchscreen-inverted-x: X axis is inverted (boolean)
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- touchscreen-inverted-y: Y axis is inverted (boolean)
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Example:
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touchscreen: tsc@0x180A6000 {
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compatible = "brcm,iproc-touchscreen";
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#address-cells = <1>;
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#size-cells = <1>;
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reg = <0x180A6000 0x40>;
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clocks = <&adc_clk>;
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clock-names = "tsc_clk";
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interrupts = <GIC_SPI 164 IRQ_TYPE_LEVEL_HIGH>;
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scanning_period = <5>;
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debounce_timeout = <40>;
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settling_timeout = <7>;
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touch_timeout = <10>;
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average_data = <5>;
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fifo_threshold = <1>;
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/* Touchscreen is rotated 180 degrees. */
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touchscreen-inverted-x;
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touchscreen-inverted-y;
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};
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@ -324,6 +324,18 @@ config TOUCHSCREEN_ILI210X
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To compile this driver as a module, choose M here: the
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module will be called ili210x.
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config TOUCHSCREEN_IPROC
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tristate "IPROC touch panel driver support"
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depends on ARCH_BCM_IPROC || COMPILE_TEST
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help
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Say Y here if you want to add support for the IPROC touch
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controller to your system.
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If unsure, say N.
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To compile this driver as a module, choose M here: the
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module will be called bcm_iproc_tsc.
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config TOUCHSCREEN_S3C2410
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tristate "Samsung S3C2410/generic touchscreen input driver"
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depends on ARCH_S3C24XX || SAMSUNG_DEV_TS
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@ -39,6 +39,7 @@ obj-$(CONFIG_TOUCHSCREEN_GOODIX) += goodix.o
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obj-$(CONFIG_TOUCHSCREEN_ILI210X) += ili210x.o
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obj-$(CONFIG_TOUCHSCREEN_INEXIO) += inexio.o
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obj-$(CONFIG_TOUCHSCREEN_INTEL_MID) += intel-mid-touch.o
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obj-$(CONFIG_TOUCHSCREEN_IPROC) += bcm_iproc_tsc.o
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obj-$(CONFIG_TOUCHSCREEN_LPC32XX) += lpc32xx_ts.o
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obj-$(CONFIG_TOUCHSCREEN_MAX11801) += max11801_ts.o
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obj-$(CONFIG_TOUCHSCREEN_MC13783) += mc13783_ts.o
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522
drivers/input/touchscreen/bcm_iproc_tsc.c
Normal file
522
drivers/input/touchscreen/bcm_iproc_tsc.c
Normal file
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@ -0,0 +1,522 @@
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/*
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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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#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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dev_dbg(dev, "%20s= 0x%08x\n", #reg, readl((priv)->regs + reg))
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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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void __iomem *regs;
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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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intr_status = readl(priv->regs + INTERRUPT_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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writel(intr_status, priv->regs + INTERRUPT_STATUS);
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/* Pen up/down */
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if (intr_status & TS_PEN_INTR_MASK) {
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if (readl(priv->regs + CONTROLLER_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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raw_coordinate = readl(priv->regs + FIFO_DATA);
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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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struct iproc_ts_priv *priv = input_get_drvdata(idev);
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u32 val;
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int error;
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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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writel(val, priv->regs + INTERRUPT_MASK);
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writel(priv->cfg_params.fifo_threshold, priv->regs + INTERRUPT_THRES);
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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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writel(val, priv->regs + REGCTL1);
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/* Try to clear all interrupt status */
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val = readl(priv->regs + INTERRUPT_STATUS);
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val |= TS_FIFO_INTR_MASK | TS_PEN_INTR_MASK;
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writel(val, priv->regs + INTERRUPT_STATUS);
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/* Initialize control reg2 */
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val = readl(priv->regs + REGCTL2);
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val |= TS_CONTROLLER_EN_BIT | TS_WIRE_MODE_BIT;
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val &= ~TS_CONTROLLER_AVGDATA_MASK;
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val |= priv->cfg_params.average_data << TS_CONTROLLER_AVGDATA_SHIFT;
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val &= ~(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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writel(val, priv->regs + REGCTL2);
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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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writel(0, priv->regs + INTERRUPT_MASK); /* Disable all interrupts */
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/* Only power down touch screen controller */
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val = readl(priv->regs + REGCTL2);
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val |= TS_CONTROLLER_PWR_TS;
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writel(val, priv->regs + REGCTL2);
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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) {
|
||||
dev_err(dev, "scanning_period (%u) must be [1-256]\n",
|
||||
val);
|
||||
return -EINVAL;
|
||||
}
|
||||
priv->cfg_params.scanning_period = val;
|
||||
}
|
||||
|
||||
if (of_property_read_u32(np, "debounce_timeout", &val) >= 0) {
|
||||
if (val > 255) {
|
||||
dev_err(dev, "debounce_timeout (%u) must be [0-255]\n",
|
||||
val);
|
||||
return -EINVAL;
|
||||
}
|
||||
priv->cfg_params.debounce_timeout = val;
|
||||
}
|
||||
|
||||
if (of_property_read_u32(np, "settling_timeout", &val) >= 0) {
|
||||
if (val > 11) {
|
||||
dev_err(dev, "settling_timeout (%u) must be [0-11]\n",
|
||||
val);
|
||||
return -EINVAL;
|
||||
}
|
||||
priv->cfg_params.settling_timeout = val;
|
||||
}
|
||||
|
||||
if (of_property_read_u32(np, "touch_timeout", &val) >= 0) {
|
||||
if (val > 255) {
|
||||
dev_err(dev, "touch_timeout (%u) must be [0-255]\n",
|
||||
val);
|
||||
return -EINVAL;
|
||||
}
|
||||
priv->cfg_params.touch_timeout = val;
|
||||
}
|
||||
|
||||
if (of_property_read_u32(np, "average_data", &val) >= 0) {
|
||||
if (val > 8) {
|
||||
dev_err(dev, "average_data (%u) must be [0-8]\n", val);
|
||||
return -EINVAL;
|
||||
}
|
||||
priv->cfg_params.average_data = val;
|
||||
}
|
||||
|
||||
if (of_property_read_u32(np, "fifo_threshold", &val) >= 0) {
|
||||
if (val > 31) {
|
||||
dev_err(dev, "fifo_threshold (%u)) must be [0-31]\n",
|
||||
val);
|
||||
return -EINVAL;
|
||||
}
|
||||
priv->cfg_params.fifo_threshold = val;
|
||||
}
|
||||
|
||||
/* Parse optional properties. */
|
||||
of_property_read_u32(np, "touchscreen-size-x", &priv->cfg_params.max_x);
|
||||
of_property_read_u32(np, "touchscreen-size-y", &priv->cfg_params.max_y);
|
||||
|
||||
of_property_read_u32(np, "touchscreen-fuzz-x",
|
||||
&priv->cfg_params.fuzz_x);
|
||||
of_property_read_u32(np, "touchscreen-fuzz-y",
|
||||
&priv->cfg_params.fuzz_y);
|
||||
|
||||
priv->cfg_params.invert_x =
|
||||
of_property_read_bool(np, "touchscreen-inverted-x");
|
||||
priv->cfg_params.invert_y =
|
||||
of_property_read_bool(np, "touchscreen-inverted-y");
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int iproc_ts_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct iproc_ts_priv *priv;
|
||||
struct input_dev *idev;
|
||||
struct resource *res;
|
||||
int irq;
|
||||
int error;
|
||||
|
||||
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
|
||||
if (!priv)
|
||||
return -ENOMEM;
|
||||
|
||||
/* touchscreen controller memory mapped regs */
|
||||
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||||
priv->regs = devm_ioremap_resource(&pdev->dev, res);
|
||||
if (IS_ERR(priv->regs)) {
|
||||
error = PTR_ERR(priv->regs);
|
||||
dev_err(&pdev->dev, "unable to map I/O memory: %d\n", error);
|
||||
return error;
|
||||
}
|
||||
|
||||
priv->tsc_clk = devm_clk_get(&pdev->dev, "tsc_clk");
|
||||
if (IS_ERR(priv->tsc_clk)) {
|
||||
error = PTR_ERR(priv->tsc_clk);
|
||||
dev_err(&pdev->dev,
|
||||
"failed getting clock tsc_clk: %d\n", error);
|
||||
return error;
|
||||
}
|
||||
|
||||
priv->pdev = pdev;
|
||||
error = iproc_get_tsc_config(&pdev->dev, priv);
|
||||
if (error) {
|
||||
dev_err(&pdev->dev, "get_tsc_config failed: %d\n", error);
|
||||
return error;
|
||||
}
|
||||
|
||||
idev = devm_input_allocate_device(&pdev->dev);
|
||||
if (!idev) {
|
||||
dev_err(&pdev->dev, "failed to allocate input device\n");
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
priv->idev = idev;
|
||||
priv->pen_status = PEN_UP_STATUS;
|
||||
|
||||
/* Set input device info */
|
||||
idev->name = IPROC_TS_NAME;
|
||||
idev->dev.parent = &pdev->dev;
|
||||
|
||||
idev->id.bustype = BUS_HOST;
|
||||
idev->id.vendor = SERIO_UNKNOWN;
|
||||
idev->id.product = 0;
|
||||
idev->id.version = 0;
|
||||
|
||||
idev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
|
||||
__set_bit(BTN_TOUCH, idev->keybit);
|
||||
|
||||
input_set_abs_params(idev, ABS_X, X_MIN, priv->cfg_params.max_x,
|
||||
priv->cfg_params.fuzz_x, 0);
|
||||
input_set_abs_params(idev, ABS_Y, Y_MIN, priv->cfg_params.max_y,
|
||||
priv->cfg_params.fuzz_y, 0);
|
||||
|
||||
idev->open = iproc_ts_start;
|
||||
idev->close = iproc_ts_stop;
|
||||
|
||||
input_set_drvdata(idev, priv);
|
||||
platform_set_drvdata(pdev, priv);
|
||||
|
||||
/* get interrupt */
|
||||
irq = platform_get_irq(pdev, 0);
|
||||
if (irq < 0) {
|
||||
dev_err(&pdev->dev, "platform_get_irq failed: %d\n", irq);
|
||||
return irq;
|
||||
}
|
||||
|
||||
error = devm_request_irq(&pdev->dev, irq,
|
||||
iproc_touchscreen_interrupt,
|
||||
IRQF_SHARED, IPROC_TS_NAME, pdev);
|
||||
if (error)
|
||||
return error;
|
||||
|
||||
error = input_register_device(priv->idev);
|
||||
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 = of_match_ptr(iproc_ts_of_match),
|
||||
},
|
||||
};
|
||||
|
||||
module_platform_driver(iproc_ts_driver);
|
||||
|
||||
MODULE_DESCRIPTION("IPROC Touchscreen driver");
|
||||
MODULE_AUTHOR("Broadcom");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
Loading…
Reference in a new issue