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401 lines
11 KiB
401 lines
11 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Touchscreen driver for WM831x PMICs |
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* |
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* Copyright 2011 Wolfson Microelectronics plc. |
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* Author: Mark Brown <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/moduleparam.h> |
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#include <linux/kernel.h> |
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#include <linux/string.h> |
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#include <linux/pm.h> |
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#include <linux/input.h> |
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#include <linux/interrupt.h> |
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#include <linux/io.h> |
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#include <linux/mfd/wm831x/core.h> |
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#include <linux/mfd/wm831x/irq.h> |
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#include <linux/mfd/wm831x/pdata.h> |
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#include <linux/platform_device.h> |
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#include <linux/slab.h> |
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#include <linux/types.h> |
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/* |
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* R16424 (0x4028) - Touch Control 1 |
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*/ |
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#define WM831X_TCH_ENA 0x8000 /* TCH_ENA */ |
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#define WM831X_TCH_CVT_ENA 0x4000 /* TCH_CVT_ENA */ |
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#define WM831X_TCH_SLPENA 0x1000 /* TCH_SLPENA */ |
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#define WM831X_TCH_Z_ENA 0x0400 /* TCH_Z_ENA */ |
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#define WM831X_TCH_Y_ENA 0x0200 /* TCH_Y_ENA */ |
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#define WM831X_TCH_X_ENA 0x0100 /* TCH_X_ENA */ |
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#define WM831X_TCH_DELAY_MASK 0x00E0 /* TCH_DELAY - [7:5] */ |
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#define WM831X_TCH_DELAY_SHIFT 5 /* TCH_DELAY - [7:5] */ |
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#define WM831X_TCH_DELAY_WIDTH 3 /* TCH_DELAY - [7:5] */ |
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#define WM831X_TCH_RATE_MASK 0x001F /* TCH_RATE - [4:0] */ |
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#define WM831X_TCH_RATE_SHIFT 0 /* TCH_RATE - [4:0] */ |
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#define WM831X_TCH_RATE_WIDTH 5 /* TCH_RATE - [4:0] */ |
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/* |
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* R16425 (0x4029) - Touch Control 2 |
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*/ |
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#define WM831X_TCH_PD_WK 0x2000 /* TCH_PD_WK */ |
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#define WM831X_TCH_5WIRE 0x1000 /* TCH_5WIRE */ |
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#define WM831X_TCH_PDONLY 0x0800 /* TCH_PDONLY */ |
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#define WM831X_TCH_ISEL 0x0100 /* TCH_ISEL */ |
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#define WM831X_TCH_RPU_MASK 0x000F /* TCH_RPU - [3:0] */ |
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#define WM831X_TCH_RPU_SHIFT 0 /* TCH_RPU - [3:0] */ |
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#define WM831X_TCH_RPU_WIDTH 4 /* TCH_RPU - [3:0] */ |
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/* |
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* R16426-8 (0x402A-C) - Touch Data X/Y/X |
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*/ |
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#define WM831X_TCH_PD 0x8000 /* TCH_PD1 */ |
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#define WM831X_TCH_DATA_MASK 0x0FFF /* TCH_DATA - [11:0] */ |
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#define WM831X_TCH_DATA_SHIFT 0 /* TCH_DATA - [11:0] */ |
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#define WM831X_TCH_DATA_WIDTH 12 /* TCH_DATA - [11:0] */ |
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struct wm831x_ts { |
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struct input_dev *input_dev; |
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struct wm831x *wm831x; |
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unsigned int data_irq; |
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unsigned int pd_irq; |
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bool pressure; |
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bool pen_down; |
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struct work_struct pd_data_work; |
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}; |
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static void wm831x_pd_data_work(struct work_struct *work) |
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{ |
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struct wm831x_ts *wm831x_ts = |
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container_of(work, struct wm831x_ts, pd_data_work); |
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if (wm831x_ts->pen_down) { |
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enable_irq(wm831x_ts->data_irq); |
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dev_dbg(wm831x_ts->wm831x->dev, "IRQ PD->DATA done\n"); |
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} else { |
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enable_irq(wm831x_ts->pd_irq); |
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dev_dbg(wm831x_ts->wm831x->dev, "IRQ DATA->PD done\n"); |
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} |
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} |
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static irqreturn_t wm831x_ts_data_irq(int irq, void *irq_data) |
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{ |
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struct wm831x_ts *wm831x_ts = irq_data; |
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struct wm831x *wm831x = wm831x_ts->wm831x; |
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static int data_types[] = { ABS_X, ABS_Y, ABS_PRESSURE }; |
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u16 data[3]; |
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int count; |
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int i, ret; |
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if (wm831x_ts->pressure) |
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count = 3; |
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else |
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count = 2; |
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wm831x_set_bits(wm831x, WM831X_INTERRUPT_STATUS_1, |
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WM831X_TCHDATA_EINT, WM831X_TCHDATA_EINT); |
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ret = wm831x_bulk_read(wm831x, WM831X_TOUCH_DATA_X, count, |
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data); |
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if (ret != 0) { |
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dev_err(wm831x->dev, "Failed to read touch data: %d\n", |
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ret); |
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return IRQ_NONE; |
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} |
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/* |
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* We get a pen down reading on every reading, report pen up if any |
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* individual reading does so. |
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*/ |
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wm831x_ts->pen_down = true; |
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for (i = 0; i < count; i++) { |
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if (!(data[i] & WM831X_TCH_PD)) { |
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wm831x_ts->pen_down = false; |
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continue; |
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} |
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input_report_abs(wm831x_ts->input_dev, data_types[i], |
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data[i] & WM831X_TCH_DATA_MASK); |
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} |
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if (!wm831x_ts->pen_down) { |
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/* Switch from data to pen down */ |
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dev_dbg(wm831x->dev, "IRQ DATA->PD\n"); |
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disable_irq_nosync(wm831x_ts->data_irq); |
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/* Don't need data any more */ |
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wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_1, |
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WM831X_TCH_X_ENA | WM831X_TCH_Y_ENA | |
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WM831X_TCH_Z_ENA, 0); |
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/* Flush any final samples that arrived while reading */ |
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wm831x_set_bits(wm831x, WM831X_INTERRUPT_STATUS_1, |
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WM831X_TCHDATA_EINT, WM831X_TCHDATA_EINT); |
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wm831x_bulk_read(wm831x, WM831X_TOUCH_DATA_X, count, data); |
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if (wm831x_ts->pressure) |
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input_report_abs(wm831x_ts->input_dev, |
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ABS_PRESSURE, 0); |
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input_report_key(wm831x_ts->input_dev, BTN_TOUCH, 0); |
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schedule_work(&wm831x_ts->pd_data_work); |
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} else { |
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input_report_key(wm831x_ts->input_dev, BTN_TOUCH, 1); |
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} |
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input_sync(wm831x_ts->input_dev); |
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return IRQ_HANDLED; |
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} |
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static irqreturn_t wm831x_ts_pen_down_irq(int irq, void *irq_data) |
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{ |
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struct wm831x_ts *wm831x_ts = irq_data; |
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struct wm831x *wm831x = wm831x_ts->wm831x; |
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int ena = 0; |
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if (wm831x_ts->pen_down) |
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return IRQ_HANDLED; |
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disable_irq_nosync(wm831x_ts->pd_irq); |
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/* Start collecting data */ |
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if (wm831x_ts->pressure) |
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ena |= WM831X_TCH_Z_ENA; |
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wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_1, |
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WM831X_TCH_X_ENA | WM831X_TCH_Y_ENA | WM831X_TCH_Z_ENA, |
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WM831X_TCH_X_ENA | WM831X_TCH_Y_ENA | ena); |
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wm831x_set_bits(wm831x, WM831X_INTERRUPT_STATUS_1, |
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WM831X_TCHPD_EINT, WM831X_TCHPD_EINT); |
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wm831x_ts->pen_down = true; |
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/* Switch from pen down to data */ |
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dev_dbg(wm831x->dev, "IRQ PD->DATA\n"); |
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schedule_work(&wm831x_ts->pd_data_work); |
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return IRQ_HANDLED; |
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} |
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static int wm831x_ts_input_open(struct input_dev *idev) |
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{ |
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struct wm831x_ts *wm831x_ts = input_get_drvdata(idev); |
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struct wm831x *wm831x = wm831x_ts->wm831x; |
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wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_1, |
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WM831X_TCH_ENA | WM831X_TCH_CVT_ENA | |
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WM831X_TCH_X_ENA | WM831X_TCH_Y_ENA | |
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WM831X_TCH_Z_ENA, WM831X_TCH_ENA); |
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wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_1, |
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WM831X_TCH_CVT_ENA, WM831X_TCH_CVT_ENA); |
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return 0; |
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} |
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static void wm831x_ts_input_close(struct input_dev *idev) |
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{ |
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struct wm831x_ts *wm831x_ts = input_get_drvdata(idev); |
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struct wm831x *wm831x = wm831x_ts->wm831x; |
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/* Shut the controller down, disabling all other functionality too */ |
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wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_1, |
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WM831X_TCH_ENA | WM831X_TCH_X_ENA | |
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WM831X_TCH_Y_ENA | WM831X_TCH_Z_ENA, 0); |
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/* Make sure any pending IRQs are done, the above will prevent |
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* new ones firing. |
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*/ |
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synchronize_irq(wm831x_ts->data_irq); |
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synchronize_irq(wm831x_ts->pd_irq); |
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/* Make sure the IRQ completion work is quiesced */ |
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flush_work(&wm831x_ts->pd_data_work); |
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/* If we ended up with the pen down then make sure we revert back |
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* to pen detection state for the next time we start up. |
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*/ |
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if (wm831x_ts->pen_down) { |
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disable_irq(wm831x_ts->data_irq); |
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enable_irq(wm831x_ts->pd_irq); |
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wm831x_ts->pen_down = false; |
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} |
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} |
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static int wm831x_ts_probe(struct platform_device *pdev) |
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{ |
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struct wm831x_ts *wm831x_ts; |
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struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); |
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struct wm831x_pdata *core_pdata = dev_get_platdata(pdev->dev.parent); |
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struct wm831x_touch_pdata *pdata = NULL; |
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struct input_dev *input_dev; |
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int error, irqf; |
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if (core_pdata) |
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pdata = core_pdata->touch; |
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wm831x_ts = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ts), |
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GFP_KERNEL); |
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input_dev = devm_input_allocate_device(&pdev->dev); |
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if (!wm831x_ts || !input_dev) { |
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error = -ENOMEM; |
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goto err_alloc; |
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} |
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wm831x_ts->wm831x = wm831x; |
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wm831x_ts->input_dev = input_dev; |
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INIT_WORK(&wm831x_ts->pd_data_work, wm831x_pd_data_work); |
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/* |
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* If we have a direct IRQ use it, otherwise use the interrupt |
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* from the WM831x IRQ controller. |
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*/ |
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wm831x_ts->data_irq = wm831x_irq(wm831x, |
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platform_get_irq_byname(pdev, |
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"TCHDATA")); |
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if (pdata && pdata->data_irq) |
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wm831x_ts->data_irq = pdata->data_irq; |
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wm831x_ts->pd_irq = wm831x_irq(wm831x, |
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platform_get_irq_byname(pdev, "TCHPD")); |
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if (pdata && pdata->pd_irq) |
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wm831x_ts->pd_irq = pdata->pd_irq; |
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if (pdata) |
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wm831x_ts->pressure = pdata->pressure; |
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else |
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wm831x_ts->pressure = true; |
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/* Five wire touchscreens can't report pressure */ |
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if (pdata && pdata->fivewire) { |
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wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_2, |
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WM831X_TCH_5WIRE, WM831X_TCH_5WIRE); |
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/* Pressure measurements are not possible for five wire mode */ |
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WARN_ON(pdata->pressure && pdata->fivewire); |
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wm831x_ts->pressure = false; |
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} else { |
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wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_2, |
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WM831X_TCH_5WIRE, 0); |
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} |
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if (pdata) { |
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switch (pdata->isel) { |
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default: |
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dev_err(&pdev->dev, "Unsupported ISEL setting: %d\n", |
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pdata->isel); |
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fallthrough; |
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case 200: |
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case 0: |
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wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_2, |
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WM831X_TCH_ISEL, 0); |
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break; |
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case 400: |
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wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_2, |
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WM831X_TCH_ISEL, WM831X_TCH_ISEL); |
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break; |
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} |
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} |
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wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_2, |
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WM831X_TCH_PDONLY, 0); |
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/* Default to 96 samples/sec */ |
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wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_1, |
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WM831X_TCH_RATE_MASK, 6); |
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if (pdata && pdata->data_irqf) |
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irqf = pdata->data_irqf; |
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else |
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irqf = IRQF_TRIGGER_HIGH; |
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error = request_threaded_irq(wm831x_ts->data_irq, |
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NULL, wm831x_ts_data_irq, |
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irqf | IRQF_ONESHOT, |
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"Touchscreen data", wm831x_ts); |
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if (error) { |
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dev_err(&pdev->dev, "Failed to request data IRQ %d: %d\n", |
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wm831x_ts->data_irq, error); |
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goto err_alloc; |
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} |
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disable_irq(wm831x_ts->data_irq); |
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if (pdata && pdata->pd_irqf) |
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irqf = pdata->pd_irqf; |
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else |
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irqf = IRQF_TRIGGER_HIGH; |
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error = request_threaded_irq(wm831x_ts->pd_irq, |
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NULL, wm831x_ts_pen_down_irq, |
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irqf | IRQF_ONESHOT, |
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"Touchscreen pen down", wm831x_ts); |
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if (error) { |
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dev_err(&pdev->dev, "Failed to request pen down IRQ %d: %d\n", |
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wm831x_ts->pd_irq, error); |
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goto err_data_irq; |
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} |
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/* set up touch configuration */ |
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input_dev->name = "WM831x touchscreen"; |
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input_dev->phys = "wm831x"; |
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input_dev->open = wm831x_ts_input_open; |
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input_dev->close = wm831x_ts_input_close; |
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__set_bit(EV_ABS, input_dev->evbit); |
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__set_bit(EV_KEY, input_dev->evbit); |
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__set_bit(BTN_TOUCH, input_dev->keybit); |
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input_set_abs_params(input_dev, ABS_X, 0, 4095, 5, 0); |
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input_set_abs_params(input_dev, ABS_Y, 0, 4095, 5, 0); |
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if (wm831x_ts->pressure) |
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input_set_abs_params(input_dev, ABS_PRESSURE, 0, 4095, 5, 0); |
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input_set_drvdata(input_dev, wm831x_ts); |
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input_dev->dev.parent = &pdev->dev; |
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error = input_register_device(input_dev); |
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if (error) |
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goto err_pd_irq; |
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platform_set_drvdata(pdev, wm831x_ts); |
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return 0; |
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err_pd_irq: |
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free_irq(wm831x_ts->pd_irq, wm831x_ts); |
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err_data_irq: |
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free_irq(wm831x_ts->data_irq, wm831x_ts); |
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err_alloc: |
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return error; |
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} |
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static int wm831x_ts_remove(struct platform_device *pdev) |
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{ |
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struct wm831x_ts *wm831x_ts = platform_get_drvdata(pdev); |
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free_irq(wm831x_ts->pd_irq, wm831x_ts); |
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free_irq(wm831x_ts->data_irq, wm831x_ts); |
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return 0; |
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} |
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static struct platform_driver wm831x_ts_driver = { |
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.driver = { |
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.name = "wm831x-touch", |
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}, |
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.probe = wm831x_ts_probe, |
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.remove = wm831x_ts_remove, |
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}; |
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module_platform_driver(wm831x_ts_driver); |
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/* Module information */ |
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MODULE_AUTHOR("Mark Brown <[email protected]>"); |
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MODULE_DESCRIPTION("WM831x PMIC touchscreen driver"); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS("platform:wm831x-touch");
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