1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * STMicroelectronics STMPE811 Touchscreen Driver
17 #include <linux/input/touchscreen.h>
26  * with touchscreen controller
46 #define STMPE_TS_NAME			"stmpe-ts"
50  * struct stmpe_touch - stmpe811 touch screen controller state
55  * @prop: Touchscreen properties
56  * @ave_ctrl: Sample average control
57  * (0 -> 1 sample, 1 -> 2 samples, 2 -> 4 samples, 3 -> 8 samples)
59  * (0 -> 10 us, 1 -> 50 us, 2 -> 100 us, 3 -> 500 us,
60  * 4-> 1 ms, 5 -> 5 ms, 6 -> 10 ms, 7 -> 50 ms)
63  * (0 -> 10 us, 1 -> 100 us, 2 -> 500 us, 3 -> 1 ms,
64  * 4 -> 5 ms, 5 -> 10 ms, 6 for 50 ms, 7 -> 100 ms)
69  * @i_drive: current limit value of the touchscreen drivers
70  * (0 -> 20 mA typical 35 mA max, 1 -> 50 mA typical 80 mA max)
106 	int_sta = stmpe_reg_read(ts->stmpe, STMPE_REG_INT_STA);  in stmpe_work()
116 		timeout--;  in stmpe_work()
117 		int_sta = stmpe_reg_read(ts->stmpe, STMPE_REG_INT_STA);  in stmpe_work()
122 	__stmpe_reset_fifo(ts->stmpe);  in stmpe_work()
124 	input_report_abs(ts->idev, ABS_PRESSURE, 0);  in stmpe_work()
125 	input_report_key(ts->idev, BTN_TOUCH, 0);  in stmpe_work()
126 	input_sync(ts->idev);  in stmpe_work()
139 	cancel_delayed_work_sync(&ts->work);  in stmpe_ts_handler()
147 	stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL,  in stmpe_ts_handler()
150 	stmpe_block_read(ts->stmpe, STMPE_REG_TSC_DATA_XYZ, 4, data_set);  in stmpe_ts_handler()
156 	touchscreen_report_pos(ts->idev, &ts->prop, x, y, false);  in stmpe_ts_handler()
157 	input_report_abs(ts->idev, ABS_PRESSURE, z);  in stmpe_ts_handler()
158 	input_report_key(ts->idev, BTN_TOUCH, 1);  in stmpe_ts_handler()
159 	input_sync(ts->idev);  in stmpe_ts_handler()
162 	__stmpe_reset_fifo(ts->stmpe);  in stmpe_ts_handler()
165 	stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL,  in stmpe_ts_handler()
169 	schedule_delayed_work(&ts->work, msecs_to_jiffies(50));  in stmpe_ts_handler()
178 	struct stmpe *stmpe = ts->stmpe;  in stmpe_init_hw()
179 	struct device *dev = ts->dev;  in stmpe_init_hw()
193 	tsc_cfg = STMPE_AVE_CTRL(ts->ave_ctrl) |  in stmpe_init_hw()
194 		  STMPE_DET_DELAY(ts->touch_det_delay) |  in stmpe_init_hw()
195 		  STMPE_SETTLING(ts->settling);  in stmpe_init_hw()
206 			STMPE_FRACTION_Z(0xff), STMPE_FRACTION_Z(ts->fraction_z));  in stmpe_init_hw()
213 			STMPE_I_DRIVE(0xff), STMPE_I_DRIVE(ts->i_drive));  in stmpe_init_hw()
241 	ret = __stmpe_reset_fifo(ts->stmpe);  in stmpe_ts_open()
245 	return stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL,  in stmpe_ts_open()
253 	cancel_delayed_work_sync(&ts->work);  in stmpe_ts_close()
255 	stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL,  in stmpe_ts_close()
262 	struct device_node *np = pdev->dev.of_node;  in stmpe_ts_get_platform_info()
266 		if (!of_property_read_u32(np, "st,sample-time", &val))  in stmpe_ts_get_platform_info()
267 			ts->stmpe->sample_time = val;  in stmpe_ts_get_platform_info()
268 		if (!of_property_read_u32(np, "st,mod-12b", &val))  in stmpe_ts_get_platform_info()
269 			ts->stmpe->mod_12b = val;  in stmpe_ts_get_platform_info()
270 		if (!of_property_read_u32(np, "st,ref-sel", &val))  in stmpe_ts_get_platform_info()
271 			ts->stmpe->ref_sel = val;  in stmpe_ts_get_platform_info()
272 		if (!of_property_read_u32(np, "st,adc-freq", &val))  in stmpe_ts_get_platform_info()
273 			ts->stmpe->adc_freq = val;  in stmpe_ts_get_platform_info()
274 		if (!of_property_read_u32(np, "st,ave-ctrl", &val))  in stmpe_ts_get_platform_info()
275 			ts->ave_ctrl = val;  in stmpe_ts_get_platform_info()
276 		if (!of_property_read_u32(np, "st,touch-det-delay", &val))  in stmpe_ts_get_platform_info()
277 			ts->touch_det_delay = val;  in stmpe_ts_get_platform_info()
279 			ts->settling = val;  in stmpe_ts_get_platform_info()
280 		if (!of_property_read_u32(np, "st,fraction-z", &val))  in stmpe_ts_get_platform_info()
281 			ts->fraction_z = val;  in stmpe_ts_get_platform_info()
282 		if (!of_property_read_u32(np, "st,i-drive", &val))  in stmpe_ts_get_platform_info()
283 			ts->i_drive = val;  in stmpe_ts_get_platform_info()
289 	struct stmpe *stmpe = dev_get_drvdata(pdev->dev.parent);  in stmpe_input_probe()
299 	ts = devm_kzalloc(&pdev->dev, sizeof(*ts), GFP_KERNEL);  in stmpe_input_probe()
301 		return -ENOMEM;  in stmpe_input_probe()
303 	idev = devm_input_allocate_device(&pdev->dev);  in stmpe_input_probe()
305 		return -ENOMEM;  in stmpe_input_probe()
308 	ts->stmpe = stmpe;  in stmpe_input_probe()
309 	ts->idev = idev;  in stmpe_input_probe()
310 	ts->dev = &pdev->dev;  in stmpe_input_probe()
314 	INIT_DELAYED_WORK(&ts->work, stmpe_work);  in stmpe_input_probe()
316 	error = devm_request_threaded_irq(&pdev->dev, ts_irq,  in stmpe_input_probe()
320 		dev_err(&pdev->dev, "Failed to request IRQ %d\n", ts_irq);  in stmpe_input_probe()
328 	idev->name = STMPE_TS_NAME;  in stmpe_input_probe()
329 	idev->phys = STMPE_TS_NAME"/input0";  in stmpe_input_probe()
330 	idev->id.bustype = BUS_I2C;  in stmpe_input_probe()
332 	idev->open = stmpe_ts_open;  in stmpe_input_probe()
333 	idev->close = stmpe_ts_close;  in stmpe_input_probe()
342 	touchscreen_parse_properties(idev, false, &ts->prop);  in stmpe_input_probe()
346 		dev_err(&pdev->dev, "Could not register input device\n");  in stmpe_input_probe()
357 	stmpe_disable(ts->stmpe, STMPE_BLOCK_TOUCHSCREEN);  in stmpe_ts_remove()
370 	{ .compatible = "st,stmpe-ts", },
376 MODULE_DESCRIPTION("STMPEXXX touchscreen driver");