2  * Touchscreen driver for the TS-4800 board
4  * Copyright (c) 2015 - Savoir-faire Linux
12 #include <linux/input.h>
13 #include <linux/input-polldev.h>
27 /* sensor values are 12-bit wide */
28 #define MAX_12BIT		((1 << 12) - 1)
46 	int                     debounce;  member
51 	struct ts4800_ts *ts = dev->private;  in ts4800_ts_open()
54 	ts->pendown = false;  in ts4800_ts_open()
55 	ts->debounce = DEBOUNCE_COUNT;  in ts4800_ts_open()
57 	ret = regmap_update_bits(ts->regmap, ts->reg, ts->bit, ts->bit);  in ts4800_ts_open()
59 		dev_warn(ts->dev, "Failed to enable touchscreen\n");  in ts4800_ts_open()
64 	struct ts4800_ts *ts = dev->private;  in ts4800_ts_close()
67 	ret = regmap_update_bits(ts->regmap, ts->reg, ts->bit, 0);  in ts4800_ts_close()
69 		dev_warn(ts->dev, "Failed to disable touchscreen\n");  in ts4800_ts_close()
75 	struct input_dev *input_dev = dev->input;  in ts4800_ts_poll()
76 	struct ts4800_ts *ts = dev->private;  in ts4800_ts_poll()
77 	u16 last_x = readw(ts->base + X_OFFSET);  in ts4800_ts_poll()
78 	u16 last_y = readw(ts->base + Y_OFFSET);  in ts4800_ts_poll()
82 		if (ts->debounce) {  in ts4800_ts_poll()
83 			ts->debounce--;  in ts4800_ts_poll()
87 		if (!ts->pendown) {  in ts4800_ts_poll()
89 			ts->pendown = true;  in ts4800_ts_poll()
98 	} else if (ts->pendown) {  in ts4800_ts_poll()
99 		ts->pendown = false;  in ts4800_ts_poll()
100 		ts->debounce = DEBOUNCE_COUNT;  in ts4800_ts_poll()
109 	struct device *dev = &pdev->dev;  in ts4800_parse_dt()
110 	struct device_node *np = dev->of_node;  in ts4800_parse_dt()
118 		return -ENODEV;  in ts4800_parse_dt()
121 	ts->regmap = syscon_node_to_regmap(syscon_np);  in ts4800_parse_dt()
123 	if (IS_ERR(ts->regmap)) {  in ts4800_parse_dt()
125 		return PTR_ERR(ts->regmap);  in ts4800_parse_dt()
134 	ts->reg = reg;  in ts4800_parse_dt()
142 	ts->bit = BIT(bit);  in ts4800_parse_dt()
154 	ts = devm_kzalloc(&pdev->dev, sizeof(*ts), GFP_KERNEL);  in ts4800_ts_probe()
156 		return -ENOMEM;  in ts4800_ts_probe()
163 	ts->base = devm_ioremap_resource(&pdev->dev, res);  in ts4800_ts_probe()
164 	if (IS_ERR(ts->base))  in ts4800_ts_probe()
165 		return PTR_ERR(ts->base);  in ts4800_ts_probe()
167 	poll_dev = devm_input_allocate_polled_device(&pdev->dev);  in ts4800_ts_probe()
169 		return -ENOMEM;  in ts4800_ts_probe()
171 	snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(&pdev->dev));  in ts4800_ts_probe()
172 	ts->poll_dev = poll_dev;  in ts4800_ts_probe()
173 	ts->dev = &pdev->dev;  in ts4800_ts_probe()
175 	poll_dev->private = ts;  in ts4800_ts_probe()
176 	poll_dev->poll_interval = POLL_INTERVAL;  in ts4800_ts_probe()
177 	poll_dev->open = ts4800_ts_open;  in ts4800_ts_probe()
178 	poll_dev->close = ts4800_ts_close;  in ts4800_ts_probe()
179 	poll_dev->poll = ts4800_ts_poll;  in ts4800_ts_probe()
181 	poll_dev->input->name = "TS-4800 Touchscreen";  in ts4800_ts_probe()
182 	poll_dev->input->phys = ts->phys;  in ts4800_ts_probe()
184 	input_set_capability(poll_dev->input, EV_KEY, BTN_TOUCH);  in ts4800_ts_probe()
185 	input_set_abs_params(poll_dev->input, ABS_X, 0, MAX_12BIT, 0, 0);  in ts4800_ts_probe()
186 	input_set_abs_params(poll_dev->input, ABS_Y, 0, MAX_12BIT, 0, 0);  in ts4800_ts_probe()
190 		dev_err(&pdev->dev,  in ts4800_ts_probe()
191 			"Unabled to register polled input device (%d)\n",  in ts4800_ts_probe()
200 	{ .compatible = "technologic,ts4800-ts", },
207 		.name = "ts4800-ts",
215 MODULE_DESCRIPTION("TS-4800 Touchscreen Driver");