^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * D-Link DIR-685 router I2C-based Touchkeys input driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (C) 2017 Linus Walleij <linus.walleij@linaro.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * This is a one-off touchkey controller based on the Cypress Semiconductor
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * CY8C214 MCU with some firmware in its internal 8KB flash. The circuit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * board inside the router is named E119921
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/i2c.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/input.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/bitops.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) struct dir685_touchkeys {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) struct device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) struct i2c_client *client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) struct input_dev *input;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) unsigned long cur_key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) u16 codes[7];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) static irqreturn_t dir685_tk_irq_thread(int irq, void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) struct dir685_touchkeys *tk = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) const int num_bits = min_t(int, ARRAY_SIZE(tk->codes), 16);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) unsigned long changed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) u8 buf[6];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) unsigned long key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) memset(buf, 0, sizeof(buf));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) err = i2c_master_recv(tk->client, buf, sizeof(buf));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) if (err != sizeof(buf)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) dev_err(tk->dev, "short read %d\n", err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) dev_dbg(tk->dev, "IN: %*ph\n", (int)sizeof(buf), buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) key = be16_to_cpup((__be16 *) &buf[4]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) /* Figure out if any bits went high or low since last message */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) changed = tk->cur_key ^ key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) for_each_set_bit(i, &changed, num_bits) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) dev_dbg(tk->dev, "key %d is %s\n", i,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) test_bit(i, &key) ? "down" : "up");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) input_report_key(tk->input, tk->codes[i], test_bit(i, &key));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) /* Store currently down keys */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) tk->cur_key = key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) input_sync(tk->input);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) static int dir685_tk_probe(struct i2c_client *client,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) const struct i2c_device_id *id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) struct dir685_touchkeys *tk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) struct device *dev = &client->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) u8 bl_data[] = { 0xa7, 0x40 };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) tk = devm_kzalloc(&client->dev, sizeof(*tk), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) if (!tk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) tk->input = devm_input_allocate_device(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) if (!tk->input)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) tk->client = client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) tk->dev = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) tk->input->keycodesize = sizeof(u16);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) tk->input->keycodemax = ARRAY_SIZE(tk->codes);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) tk->input->keycode = tk->codes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) tk->codes[0] = KEY_UP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) tk->codes[1] = KEY_DOWN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) tk->codes[2] = KEY_LEFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) tk->codes[3] = KEY_RIGHT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) tk->codes[4] = KEY_ENTER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) tk->codes[5] = KEY_WPS_BUTTON;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) * This key appears in the vendor driver, but I have
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) * not been able to activate it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) tk->codes[6] = KEY_RESERVED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) __set_bit(EV_KEY, tk->input->evbit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) for (i = 0; i < ARRAY_SIZE(tk->codes); i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) __set_bit(tk->codes[i], tk->input->keybit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) __clear_bit(KEY_RESERVED, tk->input->keybit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) tk->input->name = "D-Link DIR-685 touchkeys";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) tk->input->id.bustype = BUS_I2C;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) err = input_register_device(tk->input);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) /* Set the brightness to max level */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) err = i2c_master_send(client, bl_data, sizeof(bl_data));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) if (err != sizeof(bl_data))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) dev_warn(tk->dev, "error setting brightness level\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) if (!client->irq) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) dev_err(dev, "no IRQ on the I2C device\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) err = devm_request_threaded_irq(dev, client->irq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) NULL, dir685_tk_irq_thread,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) IRQF_ONESHOT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) "dir685-tk", tk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) dev_err(dev, "can't request IRQ\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) static const struct i2c_device_id dir685_tk_id[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) { "dir685tk", 0 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) { }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) MODULE_DEVICE_TABLE(i2c, dir685_tk_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) #ifdef CONFIG_OF
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) static const struct of_device_id dir685_tk_of_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) { .compatible = "dlink,dir685-touchkeys" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) {},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) MODULE_DEVICE_TABLE(of, dir685_tk_of_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) static struct i2c_driver dir685_tk_i2c_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) .name = "dlink-dir685-touchkeys",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) .of_match_table = of_match_ptr(dir685_tk_of_match),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) .probe = dir685_tk_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) .id_table = dir685_tk_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) module_i2c_driver(dir685_tk_i2c_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) MODULE_DESCRIPTION("D-Link DIR-685 touchkeys driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) MODULE_LICENSE("GPL");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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