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