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379 lines
9.8 KiB
379 lines
9.8 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* STMicroelectronics STMPE811 Touchscreen Driver |
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* |
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* (C) 2010 Luotao Fu <[email protected]> |
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* All rights reserved. |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/sched.h> |
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#include <linux/interrupt.h> |
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#include <linux/device.h> |
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#include <linux/of.h> |
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#include <linux/platform_device.h> |
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#include <linux/input.h> |
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#include <linux/input/touchscreen.h> |
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#include <linux/slab.h> |
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#include <linux/delay.h> |
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#include <linux/i2c.h> |
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#include <linux/workqueue.h> |
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#include <linux/mfd/stmpe.h> |
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/* Register layouts and functionalities are identical on all stmpexxx variants |
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* with touchscreen controller |
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*/ |
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#define STMPE_REG_INT_STA 0x0B |
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#define STMPE_REG_TSC_CTRL 0x40 |
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#define STMPE_REG_TSC_CFG 0x41 |
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#define STMPE_REG_FIFO_TH 0x4A |
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#define STMPE_REG_FIFO_STA 0x4B |
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#define STMPE_REG_FIFO_SIZE 0x4C |
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#define STMPE_REG_TSC_DATA_XYZ 0x52 |
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#define STMPE_REG_TSC_FRACTION_Z 0x56 |
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#define STMPE_REG_TSC_I_DRIVE 0x58 |
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#define OP_MOD_XYZ 0 |
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#define STMPE_TSC_CTRL_TSC_EN (1<<0) |
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#define STMPE_FIFO_STA_RESET (1<<0) |
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#define STMPE_IRQ_TOUCH_DET 0 |
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#define STMPE_TS_NAME "stmpe-ts" |
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#define XY_MASK 0xfff |
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/** |
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* struct stmpe_touch - stmpe811 touch screen controller state |
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* @stmpe: pointer back to STMPE MFD container |
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* @idev: registered input device |
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* @work: a work item used to scan the device |
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* @dev: a pointer back to the MFD cell struct device* |
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* @prop: Touchscreen properties |
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* @ave_ctrl: Sample average control |
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* (0 -> 1 sample, 1 -> 2 samples, 2 -> 4 samples, 3 -> 8 samples) |
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* @touch_det_delay: Touch detect interrupt delay |
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* (0 -> 10 us, 1 -> 50 us, 2 -> 100 us, 3 -> 500 us, |
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* 4-> 1 ms, 5 -> 5 ms, 6 -> 10 ms, 7 -> 50 ms) |
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* recommended is 3 |
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* @settling: Panel driver settling time |
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* (0 -> 10 us, 1 -> 100 us, 2 -> 500 us, 3 -> 1 ms, |
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* 4 -> 5 ms, 5 -> 10 ms, 6 for 50 ms, 7 -> 100 ms) |
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* recommended is 2 |
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* @fraction_z: Length of the fractional part in z |
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* (fraction_z ([0..7]) = Count of the fractional part) |
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* recommended is 7 |
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* @i_drive: current limit value of the touchscreen drivers |
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* (0 -> 20 mA typical 35 mA max, 1 -> 50 mA typical 80 mA max) |
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*/ |
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struct stmpe_touch { |
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struct stmpe *stmpe; |
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struct input_dev *idev; |
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struct delayed_work work; |
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struct device *dev; |
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struct touchscreen_properties prop; |
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u8 ave_ctrl; |
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u8 touch_det_delay; |
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u8 settling; |
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u8 fraction_z; |
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u8 i_drive; |
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}; |
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static int __stmpe_reset_fifo(struct stmpe *stmpe) |
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{ |
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int ret; |
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ret = stmpe_set_bits(stmpe, STMPE_REG_FIFO_STA, |
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STMPE_FIFO_STA_RESET, STMPE_FIFO_STA_RESET); |
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if (ret) |
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return ret; |
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return stmpe_set_bits(stmpe, STMPE_REG_FIFO_STA, |
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STMPE_FIFO_STA_RESET, 0); |
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} |
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static void stmpe_work(struct work_struct *work) |
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{ |
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int int_sta; |
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u32 timeout = 40; |
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struct stmpe_touch *ts = |
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container_of(work, struct stmpe_touch, work.work); |
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int_sta = stmpe_reg_read(ts->stmpe, STMPE_REG_INT_STA); |
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/* |
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* touch_det sometimes get desasserted or just get stuck. This appears |
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* to be a silicon bug, We still have to clearify this with the |
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* manufacture. As a workaround We release the key anyway if the |
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* touch_det keeps coming in after 4ms, while the FIFO contains no value |
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* during the whole time. |
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*/ |
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while ((int_sta & (1 << STMPE_IRQ_TOUCH_DET)) && (timeout > 0)) { |
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timeout--; |
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int_sta = stmpe_reg_read(ts->stmpe, STMPE_REG_INT_STA); |
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udelay(100); |
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} |
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/* reset the FIFO before we report release event */ |
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__stmpe_reset_fifo(ts->stmpe); |
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input_report_abs(ts->idev, ABS_PRESSURE, 0); |
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input_report_key(ts->idev, BTN_TOUCH, 0); |
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input_sync(ts->idev); |
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} |
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static irqreturn_t stmpe_ts_handler(int irq, void *data) |
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{ |
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u8 data_set[4]; |
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int x, y, z; |
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struct stmpe_touch *ts = data; |
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/* |
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* Cancel scheduled polling for release if we have new value |
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* available. Wait if the polling is already running. |
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*/ |
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cancel_delayed_work_sync(&ts->work); |
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/* |
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* The FIFO sometimes just crashes and stops generating interrupts. This |
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* appears to be a silicon bug. We still have to clearify this with |
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* the manufacture. As a workaround we disable the TSC while we are |
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* collecting data and flush the FIFO after reading |
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*/ |
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stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL, |
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STMPE_TSC_CTRL_TSC_EN, 0); |
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stmpe_block_read(ts->stmpe, STMPE_REG_TSC_DATA_XYZ, 4, data_set); |
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x = (data_set[0] << 4) | (data_set[1] >> 4); |
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y = ((data_set[1] & 0xf) << 8) | data_set[2]; |
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z = data_set[3]; |
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touchscreen_report_pos(ts->idev, &ts->prop, x, y, false); |
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input_report_abs(ts->idev, ABS_PRESSURE, z); |
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input_report_key(ts->idev, BTN_TOUCH, 1); |
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input_sync(ts->idev); |
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/* flush the FIFO after we have read out our values. */ |
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__stmpe_reset_fifo(ts->stmpe); |
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/* reenable the tsc */ |
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stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL, |
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STMPE_TSC_CTRL_TSC_EN, STMPE_TSC_CTRL_TSC_EN); |
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/* start polling for touch_det to detect release */ |
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schedule_delayed_work(&ts->work, msecs_to_jiffies(50)); |
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return IRQ_HANDLED; |
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} |
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static int stmpe_init_hw(struct stmpe_touch *ts) |
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{ |
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int ret; |
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u8 tsc_cfg, tsc_cfg_mask; |
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struct stmpe *stmpe = ts->stmpe; |
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struct device *dev = ts->dev; |
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ret = stmpe_enable(stmpe, STMPE_BLOCK_TOUCHSCREEN | STMPE_BLOCK_ADC); |
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if (ret) { |
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dev_err(dev, "Could not enable clock for ADC and TS\n"); |
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return ret; |
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} |
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ret = stmpe811_adc_common_init(stmpe); |
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if (ret) { |
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stmpe_disable(stmpe, STMPE_BLOCK_TOUCHSCREEN | STMPE_BLOCK_ADC); |
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return ret; |
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} |
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tsc_cfg = STMPE_AVE_CTRL(ts->ave_ctrl) | |
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STMPE_DET_DELAY(ts->touch_det_delay) | |
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STMPE_SETTLING(ts->settling); |
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tsc_cfg_mask = STMPE_AVE_CTRL(0xff) | STMPE_DET_DELAY(0xff) | |
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STMPE_SETTLING(0xff); |
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ret = stmpe_set_bits(stmpe, STMPE_REG_TSC_CFG, tsc_cfg_mask, tsc_cfg); |
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if (ret) { |
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dev_err(dev, "Could not config touch\n"); |
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return ret; |
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} |
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ret = stmpe_set_bits(stmpe, STMPE_REG_TSC_FRACTION_Z, |
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STMPE_FRACTION_Z(0xff), STMPE_FRACTION_Z(ts->fraction_z)); |
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if (ret) { |
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dev_err(dev, "Could not config touch\n"); |
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return ret; |
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} |
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ret = stmpe_set_bits(stmpe, STMPE_REG_TSC_I_DRIVE, |
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STMPE_I_DRIVE(0xff), STMPE_I_DRIVE(ts->i_drive)); |
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if (ret) { |
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dev_err(dev, "Could not config touch\n"); |
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return ret; |
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} |
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/* set FIFO to 1 for single point reading */ |
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ret = stmpe_reg_write(stmpe, STMPE_REG_FIFO_TH, 1); |
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if (ret) { |
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dev_err(dev, "Could not set FIFO\n"); |
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return ret; |
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} |
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ret = stmpe_set_bits(stmpe, STMPE_REG_TSC_CTRL, |
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STMPE_OP_MODE(0xff), STMPE_OP_MODE(OP_MOD_XYZ)); |
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if (ret) { |
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dev_err(dev, "Could not set mode\n"); |
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return ret; |
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} |
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return 0; |
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} |
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static int stmpe_ts_open(struct input_dev *dev) |
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{ |
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struct stmpe_touch *ts = input_get_drvdata(dev); |
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int ret = 0; |
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ret = __stmpe_reset_fifo(ts->stmpe); |
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if (ret) |
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return ret; |
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return stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL, |
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STMPE_TSC_CTRL_TSC_EN, STMPE_TSC_CTRL_TSC_EN); |
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} |
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static void stmpe_ts_close(struct input_dev *dev) |
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{ |
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struct stmpe_touch *ts = input_get_drvdata(dev); |
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cancel_delayed_work_sync(&ts->work); |
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stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL, |
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STMPE_TSC_CTRL_TSC_EN, 0); |
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} |
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static void stmpe_ts_get_platform_info(struct platform_device *pdev, |
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struct stmpe_touch *ts) |
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{ |
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struct device_node *np = pdev->dev.of_node; |
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u32 val; |
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if (np) { |
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if (!of_property_read_u32(np, "st,sample-time", &val)) |
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ts->stmpe->sample_time = val; |
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if (!of_property_read_u32(np, "st,mod-12b", &val)) |
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ts->stmpe->mod_12b = val; |
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if (!of_property_read_u32(np, "st,ref-sel", &val)) |
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ts->stmpe->ref_sel = val; |
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if (!of_property_read_u32(np, "st,adc-freq", &val)) |
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ts->stmpe->adc_freq = val; |
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if (!of_property_read_u32(np, "st,ave-ctrl", &val)) |
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ts->ave_ctrl = val; |
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if (!of_property_read_u32(np, "st,touch-det-delay", &val)) |
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ts->touch_det_delay = val; |
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if (!of_property_read_u32(np, "st,settling", &val)) |
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ts->settling = val; |
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if (!of_property_read_u32(np, "st,fraction-z", &val)) |
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ts->fraction_z = val; |
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if (!of_property_read_u32(np, "st,i-drive", &val)) |
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ts->i_drive = val; |
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} |
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} |
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static int stmpe_input_probe(struct platform_device *pdev) |
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{ |
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struct stmpe *stmpe = dev_get_drvdata(pdev->dev.parent); |
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struct stmpe_touch *ts; |
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struct input_dev *idev; |
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int error; |
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int ts_irq; |
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ts_irq = platform_get_irq_byname(pdev, "FIFO_TH"); |
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if (ts_irq < 0) |
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return ts_irq; |
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ts = devm_kzalloc(&pdev->dev, sizeof(*ts), GFP_KERNEL); |
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if (!ts) |
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return -ENOMEM; |
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idev = devm_input_allocate_device(&pdev->dev); |
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if (!idev) |
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return -ENOMEM; |
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platform_set_drvdata(pdev, ts); |
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ts->stmpe = stmpe; |
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ts->idev = idev; |
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ts->dev = &pdev->dev; |
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stmpe_ts_get_platform_info(pdev, ts); |
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INIT_DELAYED_WORK(&ts->work, stmpe_work); |
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error = devm_request_threaded_irq(&pdev->dev, ts_irq, |
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NULL, stmpe_ts_handler, |
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IRQF_ONESHOT, STMPE_TS_NAME, ts); |
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if (error) { |
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dev_err(&pdev->dev, "Failed to request IRQ %d\n", ts_irq); |
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return error; |
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} |
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error = stmpe_init_hw(ts); |
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if (error) |
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return error; |
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idev->name = STMPE_TS_NAME; |
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idev->phys = STMPE_TS_NAME"/input0"; |
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idev->id.bustype = BUS_I2C; |
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idev->open = stmpe_ts_open; |
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idev->close = stmpe_ts_close; |
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input_set_drvdata(idev, ts); |
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input_set_capability(idev, EV_KEY, BTN_TOUCH); |
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input_set_abs_params(idev, ABS_X, 0, XY_MASK, 0, 0); |
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input_set_abs_params(idev, ABS_Y, 0, XY_MASK, 0, 0); |
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input_set_abs_params(idev, ABS_PRESSURE, 0x0, 0xff, 0, 0); |
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touchscreen_parse_properties(idev, false, &ts->prop); |
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error = input_register_device(idev); |
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if (error) { |
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dev_err(&pdev->dev, "Could not register input device\n"); |
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return error; |
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} |
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return 0; |
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} |
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static int stmpe_ts_remove(struct platform_device *pdev) |
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{ |
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struct stmpe_touch *ts = platform_get_drvdata(pdev); |
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stmpe_disable(ts->stmpe, STMPE_BLOCK_TOUCHSCREEN); |
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return 0; |
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} |
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static struct platform_driver stmpe_ts_driver = { |
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.driver = { |
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.name = STMPE_TS_NAME, |
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}, |
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.probe = stmpe_input_probe, |
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.remove = stmpe_ts_remove, |
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}; |
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module_platform_driver(stmpe_ts_driver); |
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static const struct of_device_id stmpe_ts_ids[] = { |
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{ .compatible = "st,stmpe-ts", }, |
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{ }, |
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}; |
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MODULE_DEVICE_TABLE(of, stmpe_ts_ids); |
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MODULE_AUTHOR("Luotao Fu <[email protected]>"); |
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MODULE_DESCRIPTION("STMPEXXX touchscreen driver"); |
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MODULE_LICENSE("GPL");
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