// SPDX-License-Identifier: GPL-2.0-or-later /* * wm97xx-core.c -- Touch screen driver core for Wolfson WM9705, WM9712 * and WM9713 AC97 Codecs. * * Copyright 2003, 2004, 2005, 2006, 2007, 2008 Wolfson Microelectronics PLC. * Author: Liam Girdwood <[email protected]> * Parts Copyright : Ian Molton <[email protected]> * Andrew Zabolotny <[email protected]> * Russell King <[email protected]> * * Notes: * * Features: * - supports WM9705, WM9712, WM9713 * - polling mode * - continuous mode (arch-dependent) * - adjustable rpu/dpp settings * - adjustable pressure current * - adjustable sample settle delay * - 4 and 5 wire touchscreens (5 wire is WM9712 only) * - pen down detection * - battery monitor * - sample AUX adcs * - power management * - codec GPIO * - codec event notification * Todo * - Support for async sampling control for noisy LCDs. */ #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/kernel.h> #include <linux/init.h> #include <linux/delay.h> #include <linux/string.h> #include <linux/proc_fs.h> #include <linux/pm.h> #include <linux/interrupt.h> #include <linux/bitops.h> #include <linux/mfd/wm97xx.h> #include <linux/workqueue.h> #include <linux/wm97xx.h> #include <linux/uaccess.h> #include <linux/io.h> #include <linux/slab.h> #define TS_NAME … #define WM_CORE_VERSION … #define DEFAULT_PRESSURE … /* * Touchscreen absolute values * * These parameters are used to help the input layer discard out of * range readings and reduce jitter etc. * * o min, max:- indicate the min and max values your touch screen returns * o fuzz:- use a higher number to reduce jitter * * The default values correspond to Mainstone II in QVGA mode * * Please read * Documentation/input/input-programming.rst for more details. */ static int abs_x[3] = …; module_param_array(…); MODULE_PARM_DESC(…) …; static int abs_y[3] = …; module_param_array(…); MODULE_PARM_DESC(…) …; static int abs_p[3] = …; module_param_array(…); MODULE_PARM_DESC(…) …; /* * wm97xx IO access, all IO locking done by AC97 layer */ int wm97xx_reg_read(struct wm97xx *wm, u16 reg) { … } EXPORT_SYMBOL_GPL(…); void wm97xx_reg_write(struct wm97xx *wm, u16 reg, u16 val) { … } EXPORT_SYMBOL_GPL(…); /** * wm97xx_read_aux_adc - Read the aux adc. * @wm: wm97xx device. * @adcsel: codec ADC to be read * * Reads the selected AUX ADC. */ int wm97xx_read_aux_adc(struct wm97xx *wm, u16 adcsel) { … } EXPORT_SYMBOL_GPL(…); /** * wm97xx_get_gpio - Get the status of a codec GPIO. * @wm: wm97xx device. * @gpio: gpio * * Get the status of a codec GPIO pin */ enum wm97xx_gpio_status wm97xx_get_gpio(struct wm97xx *wm, u32 gpio) { … } EXPORT_SYMBOL_GPL(…); /** * wm97xx_set_gpio - Set the status of a codec GPIO. * @wm: wm97xx device. * @gpio: gpio * @status: status * * Set the status of a codec GPIO pin */ void wm97xx_set_gpio(struct wm97xx *wm, u32 gpio, enum wm97xx_gpio_status status) { … } EXPORT_SYMBOL_GPL(…); /* * Codec GPIO pin configuration, this sets pin direction, polarity, * stickyness and wake up. */ void wm97xx_config_gpio(struct wm97xx *wm, u32 gpio, enum wm97xx_gpio_dir dir, enum wm97xx_gpio_pol pol, enum wm97xx_gpio_sticky sticky, enum wm97xx_gpio_wake wake) { … } EXPORT_SYMBOL_GPL(…); /* * Configure the WM97XX_PRP value to use while system is suspended. * If a value other than 0 is set then WM97xx pen detection will be * left enabled in the configured mode while the system is in suspend, * the device has users and suspend has not been disabled via the * wakeup sysfs entries. * * @wm: WM97xx device to configure * @mode: WM97XX_PRP value to configure while suspended */ void wm97xx_set_suspend_mode(struct wm97xx *wm, u16 mode) { … } EXPORT_SYMBOL_GPL(…); /* * Codec PENDOWN irq handler * */ static irqreturn_t wm97xx_pen_interrupt(int irq, void *dev_id) { … } /* * initialise pen IRQ handler and workqueue */ static int wm97xx_init_pen_irq(struct wm97xx *wm) { … } static int wm97xx_read_samples(struct wm97xx *wm) { … } /* * The touchscreen sample reader. */ static void wm97xx_ts_reader(struct work_struct *work) { … } /** * wm97xx_ts_input_open - Open the touch screen input device. * @idev: Input device to be opened. * * Called by the input sub system to open a wm97xx touchscreen device. * Starts the touchscreen thread and touch digitiser. */ static int wm97xx_ts_input_open(struct input_dev *idev) { … } /** * wm97xx_ts_input_close - Close the touch screen input device. * @idev: Input device to be closed. * * Called by the input sub system to close a wm97xx touchscreen * device. Kills the touchscreen thread and stops the touch * digitiser. */ static void wm97xx_ts_input_close(struct input_dev *idev) { … } static int wm97xx_register_touch(struct wm97xx *wm) { … } static void wm97xx_unregister_touch(struct wm97xx *wm) { … } static int _wm97xx_probe(struct wm97xx *wm) { … } static void wm97xx_remove_battery(struct wm97xx *wm) { … } static int wm97xx_add_battery(struct wm97xx *wm, struct wm97xx_batt_pdata *pdata) { … } static int wm97xx_probe(struct device *dev) { … } static int wm97xx_remove(struct device *dev) { … } static int wm97xx_mfd_probe(struct platform_device *pdev) { … } static void wm97xx_mfd_remove(struct platform_device *pdev) { … } static int wm97xx_suspend(struct device *dev) { … } static int wm97xx_resume(struct device *dev) { … } static DEFINE_SIMPLE_DEV_PM_OPS(wm97xx_pm_ops, wm97xx_suspend, wm97xx_resume); /* * Machine specific operations */ int wm97xx_register_mach_ops(struct wm97xx *wm, struct wm97xx_mach_ops *mach_ops) { … } EXPORT_SYMBOL_GPL(…); void wm97xx_unregister_mach_ops(struct wm97xx *wm) { … } EXPORT_SYMBOL_GPL(…); static struct device_driver wm97xx_driver = …; static struct platform_driver wm97xx_mfd_driver = …; static int __init wm97xx_init(void) { … } static void __exit wm97xx_exit(void) { … } module_init(…) …; module_exit(wm97xx_exit); /* Module information */ MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
Codebase Browser
linux