Orange Pi5 kernel

^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)  * Atmel Atmegaxx Capacitive Touch Button Driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright (C) 2016 Google, inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  * It's irrelevant that the HW used to develop captouch driver is based
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  * on Atmega88PA part and uses QtouchADC parts for sensing touch.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11)  * Calling this driver "captouch" is an arbitrary way to distinguish
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12)  * the protocol this driver supported by other atmel/qtouch drivers.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14)  * Captouch driver supports a newer/different version of the I2C
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15)  * registers/commands than the qt1070.c driver.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16)  * Don't let the similarity of the general driver structure fool you.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18)  * For raw i2c access from userspace, use i2cset/i2cget
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19)  * to poke at /dev/i2c-N devices.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #include <linux/i2c.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) #include <linux/input.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) /* Maximum number of buttons supported */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) #define MAX_NUM_OF_BUTTONS		8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) /* Registers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) #define REG_KEY1_THRESHOLD		0x02
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) #define REG_KEY2_THRESHOLD		0x03
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) #define REG_KEY3_THRESHOLD		0x04
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) #define REG_KEY4_THRESHOLD		0x05
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) #define REG_KEY1_REF_H			0x20
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) #define REG_KEY1_REF_L			0x21
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) #define REG_KEY2_REF_H			0x22
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) #define REG_KEY2_REF_L			0x23
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) #define REG_KEY3_REF_H			0x24
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) #define REG_KEY3_REF_L			0x25
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) #define REG_KEY4_REF_H			0x26
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) #define REG_KEY4_REF_L			0x27
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) #define REG_KEY1_DLT_H			0x30
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) #define REG_KEY1_DLT_L			0x31
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) #define REG_KEY2_DLT_H			0x32
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) #define REG_KEY2_DLT_L			0x33
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) #define REG_KEY3_DLT_H			0x34
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) #define REG_KEY3_DLT_L			0x35
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) #define REG_KEY4_DLT_H			0x36
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) #define REG_KEY4_DLT_L			0x37
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) #define REG_KEY_STATE			0x3C
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61)  * @i2c_client: I2C slave device client pointer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62)  * @input: Input device pointer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63)  * @num_btn: Number of buttons
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64)  * @keycodes: map of button# to KeyCode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65)  * @prev_btn: Previous key state to detect button "press" or "release"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66)  * @xfer_buf: I2C transfer buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) struct atmel_captouch_device {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	struct i2c_client *client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	struct input_dev *input;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	u32 num_btn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	u32 keycodes[MAX_NUM_OF_BUTTONS];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	u8 prev_btn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	u8 xfer_buf[8] ____cacheline_aligned;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78)  * Read from I2C slave device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79)  * The protocol is that the client has to provide both the register address
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80)  * and the length, and while reading back the device would prepend the data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81)  * with address and length for verification.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) static int atmel_read(struct atmel_captouch_device *capdev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 			 u8 reg, u8 *data, size_t len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	struct i2c_client *client = capdev->client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	struct device *dev = &client->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	struct i2c_msg msg[2];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	if (len > sizeof(capdev->xfer_buf) - 2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	capdev->xfer_buf[0] = reg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	capdev->xfer_buf[1] = len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	msg[0].addr = client->addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	msg[0].flags = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	msg[0].buf = capdev->xfer_buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	msg[0].len = 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	msg[1].addr = client->addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	msg[1].flags = I2C_M_RD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	msg[1].buf = capdev->xfer_buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	msg[1].len = len + 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	err = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	if (err != ARRAY_SIZE(msg))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 		return err < 0 ? err : -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	if (capdev->xfer_buf[0] != reg) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 		dev_err(dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 			"I2C read error: register address does not match (%#02x vs %02x)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 			capdev->xfer_buf[0], reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 		return -ECOMM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	memcpy(data, &capdev->xfer_buf[2], len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)  * Handle interrupt and report the key changes to the input system.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)  * Multi-touch can be supported; however, it really depends on whether
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)  * the device can multi-touch.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) static irqreturn_t atmel_captouch_isr(int irq, void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	struct atmel_captouch_device *capdev = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	struct device *dev = &capdev->client->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	u8 new_btn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	u8 changed_btn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	error = atmel_read(capdev, REG_KEY_STATE, &new_btn, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	if (error) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 		dev_err(dev, "failed to read button state: %d\n", error);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	dev_dbg(dev, "%s: button state %#02x\n", __func__, new_btn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	changed_btn = new_btn ^ capdev->prev_btn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	capdev->prev_btn = new_btn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	for (i = 0; i < capdev->num_btn; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 		if (changed_btn & BIT(i))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 			input_report_key(capdev->input,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 					 capdev->keycodes[i],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 					 new_btn & BIT(i));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	input_sync(capdev->input);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)  * Probe function to setup the device, input system and interrupt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) static int atmel_captouch_probe(struct i2c_client *client,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 		const struct i2c_device_id *id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	struct atmel_captouch_device *capdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	struct device *dev = &client->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	struct device_node *node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	if (!i2c_check_functionality(client->adapter,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 				     I2C_FUNC_SMBUS_BYTE_DATA |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 					I2C_FUNC_SMBUS_WORD_DATA |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 					I2C_FUNC_SMBUS_I2C_BLOCK)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 		dev_err(dev, "needed i2c functionality is not supported\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	capdev = devm_kzalloc(dev, sizeof(*capdev), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	if (!capdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	capdev->client = client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	err = atmel_read(capdev, REG_KEY_STATE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 			    &capdev->prev_btn, sizeof(capdev->prev_btn));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 		dev_err(dev, "failed to read initial button state: %d\n", err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	capdev->input = devm_input_allocate_device(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	if (!capdev->input) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 		dev_err(dev, "failed to allocate input device\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	capdev->input->id.bustype = BUS_I2C;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	capdev->input->id.product = 0x880A;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	capdev->input->id.version = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	capdev->input->name = "ATMegaXX Capacitive Button Controller";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	__set_bit(EV_KEY, capdev->input->evbit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	node = dev->of_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	if (!node) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 		dev_err(dev, "failed to find matching node in device tree\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	if (of_property_read_bool(node, "autorepeat"))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 		__set_bit(EV_REP, capdev->input->evbit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	capdev->num_btn = of_property_count_u32_elems(node, "linux,keymap");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	if (capdev->num_btn > MAX_NUM_OF_BUTTONS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 		capdev->num_btn = MAX_NUM_OF_BUTTONS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	err = of_property_read_u32_array(node, "linux,keycodes",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 					 capdev->keycodes,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 					 capdev->num_btn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 		dev_err(dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 			"failed to read linux,keycode property: %d\n", err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	for (i = 0; i < capdev->num_btn; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 		__set_bit(capdev->keycodes[i], capdev->input->keybit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	capdev->input->keycode = capdev->keycodes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	capdev->input->keycodesize = sizeof(capdev->keycodes[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	capdev->input->keycodemax = capdev->num_btn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	err = input_register_device(capdev->input);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	err = devm_request_threaded_irq(dev, client->irq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 					NULL, atmel_captouch_isr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 					IRQF_ONESHOT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 					"atmel_captouch", capdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 		dev_err(dev, "failed to request irq %d: %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 			client->irq, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) #ifdef CONFIG_OF
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) static const struct of_device_id atmel_captouch_of_id[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	{
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 		.compatible = "atmel,captouch",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	{ /* sentinel */ }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) MODULE_DEVICE_TABLE(of, atmel_captouch_of_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) static const struct i2c_device_id atmel_captouch_id[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	{ "atmel_captouch", 0 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	{ }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) MODULE_DEVICE_TABLE(i2c, atmel_captouch_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) static struct i2c_driver atmel_captouch_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	.probe		= atmel_captouch_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	.id_table	= atmel_captouch_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	.driver		= {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 		.name	= "atmel_captouch",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 		.of_match_table = of_match_ptr(atmel_captouch_of_id),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) module_i2c_driver(atmel_captouch_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) /* Module information */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) MODULE_AUTHOR("Hung-yu Wu <hywu@google.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) MODULE_DESCRIPTION("Atmel ATmegaXX Capacitance Touch Sensor I2C Driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) MODULE_LICENSE("GPL v2");