// SPDX-License-Identifier: GPL-2.0-or-later /* * STMicroelectronics STMPE811 Touchscreen Driver * * (C) 2010 Luotao Fu <[email protected]> * All rights reserved. */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/sched.h> #include <linux/interrupt.h> #include <linux/device.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/input.h> #include <linux/input/touchscreen.h> #include <linux/slab.h> #include <linux/delay.h> #include <linux/i2c.h> #include <linux/workqueue.h> #include <linux/mfd/stmpe.h> /* Register layouts and functionalities are identical on all stmpexxx variants * with touchscreen controller */ #define STMPE_REG_INT_STA … #define STMPE_REG_TSC_CTRL … #define STMPE_REG_TSC_CFG … #define STMPE_REG_FIFO_TH … #define STMPE_REG_FIFO_STA … #define STMPE_REG_FIFO_SIZE … #define STMPE_REG_TSC_DATA_XYZ … #define STMPE_REG_TSC_FRACTION_Z … #define STMPE_REG_TSC_I_DRIVE … #define OP_MOD_XYZ … #define STMPE_TSC_CTRL_TSC_EN … #define STMPE_FIFO_STA_RESET … #define STMPE_IRQ_TOUCH_DET … #define STMPE_TS_NAME … #define XY_MASK … /** * struct stmpe_touch - stmpe811 touch screen controller state * @stmpe: pointer back to STMPE MFD container * @idev: registered input device * @work: a work item used to scan the device * @dev: a pointer back to the MFD cell struct device* * @prop: Touchscreen properties * @ave_ctrl: Sample average control * (0 -> 1 sample, 1 -> 2 samples, 2 -> 4 samples, 3 -> 8 samples) * @touch_det_delay: Touch detect interrupt delay * (0 -> 10 us, 1 -> 50 us, 2 -> 100 us, 3 -> 500 us, * 4-> 1 ms, 5 -> 5 ms, 6 -> 10 ms, 7 -> 50 ms) * recommended is 3 * @settling: Panel driver settling time * (0 -> 10 us, 1 -> 100 us, 2 -> 500 us, 3 -> 1 ms, * 4 -> 5 ms, 5 -> 10 ms, 6 for 50 ms, 7 -> 100 ms) * recommended is 2 * @fraction_z: Length of the fractional part in z * (fraction_z ([0..7]) = Count of the fractional part) * recommended is 7 * @i_drive: current limit value of the touchscreen drivers * (0 -> 20 mA typical 35 mA max, 1 -> 50 mA typical 80 mA max) */ struct stmpe_touch { … }; static int __stmpe_reset_fifo(struct stmpe *stmpe) { … } static void stmpe_work(struct work_struct *work) { … } static irqreturn_t stmpe_ts_handler(int irq, void *data) { … } static int stmpe_init_hw(struct stmpe_touch *ts) { … } static int stmpe_ts_open(struct input_dev *dev) { … } static void stmpe_ts_close(struct input_dev *dev) { … } static void stmpe_ts_get_platform_info(struct platform_device *pdev, struct stmpe_touch *ts) { … } static int stmpe_input_probe(struct platform_device *pdev) { … } static void stmpe_ts_remove(struct platform_device *pdev) { … } static struct platform_driver stmpe_ts_driver = …; module_platform_driver(…) …; static const struct of_device_id stmpe_ts_ids[] = …; MODULE_DEVICE_TABLE(of, stmpe_ts_ids); MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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