1 // SPDX-License-Identifier: GPL-2.0-only
3  * D-Link DIR-685 router I2C-based Touchkeys input driver
6  * This is a one-off touchkey controller based on the Cypress Semiconductor
30 	const int num_bits = min_t(int, ARRAY_SIZE(tk->codes), 16);  in dir685_tk_irq_thread()
33 	unsigned long key;  in dir685_tk_irq_thread()  local
38 	err = i2c_master_recv(tk->client, buf, sizeof(buf));  in dir685_tk_irq_thread()
40 		dev_err(tk->dev, "short read %d\n", err);  in dir685_tk_irq_thread()
44 	dev_dbg(tk->dev, "IN: %*ph\n", (int)sizeof(buf), buf);  in dir685_tk_irq_thread()
45 	key = be16_to_cpup((__be16 *) &buf[4]);  in dir685_tk_irq_thread()
48 	changed = tk->cur_key ^ key;  in dir685_tk_irq_thread()
50 		dev_dbg(tk->dev, "key %d is %s\n", i,  in dir685_tk_irq_thread()
51 			test_bit(i, &key) ? "down" : "up");  in dir685_tk_irq_thread()
52 		input_report_key(tk->input, tk->codes[i], test_bit(i, &key));  in dir685_tk_irq_thread()
55 	/* Store currently down keys */  in dir685_tk_irq_thread()
56 	tk->cur_key = key;  in dir685_tk_irq_thread()
57 	input_sync(tk->input);  in dir685_tk_irq_thread()
65 	struct device *dev = &client->dev;  in dir685_tk_probe()
70 	tk = devm_kzalloc(&client->dev, sizeof(*tk), GFP_KERNEL);  in dir685_tk_probe()
72 		return -ENOMEM;  in dir685_tk_probe()
74 	tk->input = devm_input_allocate_device(dev);  in dir685_tk_probe()
75 	if (!tk->input)  in dir685_tk_probe()
76 		return -ENOMEM;  in dir685_tk_probe()
78 	tk->client = client;  in dir685_tk_probe()
79 	tk->dev = dev;  in dir685_tk_probe()
81 	tk->input->keycodesize = sizeof(u16);  in dir685_tk_probe()
82 	tk->input->keycodemax = ARRAY_SIZE(tk->codes);  in dir685_tk_probe()
83 	tk->input->keycode = tk->codes;  in dir685_tk_probe()
84 	tk->codes[0] = KEY_UP;  in dir685_tk_probe()
85 	tk->codes[1] = KEY_DOWN;  in dir685_tk_probe()
86 	tk->codes[2] = KEY_LEFT;  in dir685_tk_probe()
87 	tk->codes[3] = KEY_RIGHT;  in dir685_tk_probe()
88 	tk->codes[4] = KEY_ENTER;  in dir685_tk_probe()
89 	tk->codes[5] = KEY_WPS_BUTTON;  in dir685_tk_probe()
91 	 * This key appears in the vendor driver, but I have  in dir685_tk_probe()
94 	tk->codes[6] = KEY_RESERVED;  in dir685_tk_probe()
96 	__set_bit(EV_KEY, tk->input->evbit);  in dir685_tk_probe()
97 	for (i = 0; i < ARRAY_SIZE(tk->codes); i++)  in dir685_tk_probe()
98 		__set_bit(tk->codes[i], tk->input->keybit);  in dir685_tk_probe()
99 	__clear_bit(KEY_RESERVED, tk->input->keybit);  in dir685_tk_probe()
101 	tk->input->name = "D-Link DIR-685 touchkeys";  in dir685_tk_probe()
102 	tk->input->id.bustype = BUS_I2C;  in dir685_tk_probe()
104 	err = input_register_device(tk->input);  in dir685_tk_probe()
111 		dev_warn(tk->dev, "error setting brightness level\n");  in dir685_tk_probe()
113 	if (!client->irq) {  in dir685_tk_probe()
115 		return -ENODEV;  in dir685_tk_probe()
117 	err = devm_request_threaded_irq(dev, client->irq,  in dir685_tk_probe()
120 					"dir685-tk", tk);  in dir685_tk_probe()
137 	{ .compatible = "dlink,dir685-touchkeys" },
145 		.name	= "dlink-dir685-touchkeys",
154 MODULE_DESCRIPTION("D-Link DIR-685 touchkeys driver");