2  * Touchscreen driver for the TS-4800 board
4  * Copyright (c) 2015 - Savoir-faire Linux
12 #include <linux/input.h>
26 /* sensor values are 12-bit wide */
27 #define MAX_12BIT		((1 << 12) - 1)
35 	struct input_dev        *input;  member
45 	int                     debounce;  member
53 	ts->pendown = false;  in ts4800_ts_open()
54 	ts->debounce = DEBOUNCE_COUNT;  in ts4800_ts_open()
56 	error = regmap_update_bits(ts->regmap, ts->reg, ts->bit, ts->bit);  in ts4800_ts_open()
58 		dev_warn(ts->dev, "Failed to enable touchscreen: %d\n", error);  in ts4800_ts_open()
70 	ret = regmap_update_bits(ts->regmap, ts->reg, ts->bit, 0);  in ts4800_ts_close()
72 		dev_warn(ts->dev, "Failed to disable touchscreen\n");  in ts4800_ts_close()
79 	u16 last_x = readw(ts->base + X_OFFSET);  in ts4800_ts_poll()
80 	u16 last_y = readw(ts->base + Y_OFFSET);  in ts4800_ts_poll()
84 		if (ts->debounce) {  in ts4800_ts_poll()
85 			ts->debounce--;  in ts4800_ts_poll()
89 		if (!ts->pendown) {  in ts4800_ts_poll()
91 			ts->pendown = true;  in ts4800_ts_poll()
100 	} else if (ts->pendown) {  in ts4800_ts_poll()
101 		ts->pendown = false;  in ts4800_ts_poll()
102 		ts->debounce = DEBOUNCE_COUNT;  in ts4800_ts_poll()
111 	struct device *dev = &pdev->dev;  in ts4800_parse_dt()
112 	struct device_node *np = dev->of_node;  in ts4800_parse_dt()
120 		return -ENODEV;  in ts4800_parse_dt()
123 	ts->regmap = syscon_node_to_regmap(syscon_np);  in ts4800_parse_dt()
124 	if (IS_ERR(ts->regmap)) {  in ts4800_parse_dt()
126 		return PTR_ERR(ts->regmap);  in ts4800_parse_dt()
135 	ts->reg = reg;  in ts4800_parse_dt()
143 	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()
162 	ts->base = devm_platform_ioremap_resource(pdev, 0);  in ts4800_ts_probe()
163 	if (IS_ERR(ts->base))  in ts4800_ts_probe()
164 		return PTR_ERR(ts->base);  in ts4800_ts_probe()
166 	input_dev = devm_input_allocate_device(&pdev->dev);  in ts4800_ts_probe()
168 		return -ENOMEM;  in ts4800_ts_probe()
170 	snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(&pdev->dev));  in ts4800_ts_probe()
171 	ts->input = input_dev;  in ts4800_ts_probe()
172 	ts->dev = &pdev->dev;  in ts4800_ts_probe()
176 	input_dev->name = "TS-4800 Touchscreen";  in ts4800_ts_probe()
177 	input_dev->phys = ts->phys;  in ts4800_ts_probe()
179 	input_dev->open = ts4800_ts_open;  in ts4800_ts_probe()
180 	input_dev->close = ts4800_ts_close;  in ts4800_ts_probe()
188 		dev_err(&pdev->dev, "Unable to set up polling: %d\n", error);  in ts4800_ts_probe()
196 		dev_err(&pdev->dev,  in ts4800_ts_probe()
197 			"Unable to register input device: %d\n", error);  in ts4800_ts_probe()
205 	{ .compatible = "technologic,ts4800-ts", },
212 		.name = "ts4800-ts",
220 MODULE_DESCRIPTION("TS-4800 Touchscreen Driver");