Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Input driver for joysticks connected over ADC.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  * Copyright (c) 2019-2020 Artur Rojek <contact@artur-rojek.eu>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) #include <linux/ctype.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) #include <linux/input.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/iio/iio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/iio/consumer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/property.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <asm/unaligned.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) struct adc_joystick_axis {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 	u32 code;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 	s32 range[2];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 	s32 fuzz;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 	s32 flat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) struct adc_joystick {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 	struct input_dev *input;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 	struct iio_cb_buffer *buffer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	struct adc_joystick_axis *axes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 	struct iio_channel *chans;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 	int num_chans;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) static int adc_joystick_handle(const void *data, void *private)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	struct adc_joystick *joy = private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	enum iio_endian endianness;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	int bytes, msb, val, idx, i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	const u16 *data_u16;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	bool sign;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	bytes = joy->chans[0].channel->scan_type.storagebits >> 3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	for (i = 0; i < joy->num_chans; ++i) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 		idx = joy->chans[i].channel->scan_index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 		endianness = joy->chans[i].channel->scan_type.endianness;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 		msb = joy->chans[i].channel->scan_type.realbits - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 		sign = tolower(joy->chans[i].channel->scan_type.sign) == 's';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 		switch (bytes) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 		case 1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 			val = ((const u8 *)data)[idx];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 		case 2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 			data_u16 = (const u16 *)data + idx;
^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) 			 * Data is aligned to the sample size by IIO core.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 			 * Call `get_unaligned_xe16` to hide type casting.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 			 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 			if (endianness == IIO_BE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 				val = get_unaligned_be16(data_u16);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 			else if (endianness == IIO_LE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 				val = get_unaligned_le16(data_u16);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 			else /* IIO_CPU */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 				val = *data_u16;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 		default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 			return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 		val >>= joy->chans[i].channel->scan_type.shift;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 		if (sign)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 			val = sign_extend32(val, msb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 			val &= GENMASK(msb, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 		input_report_abs(joy->input, joy->axes[i].code, val);
^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) 	input_sync(joy->input);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) static int adc_joystick_open(struct input_dev *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	struct adc_joystick *joy = input_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	struct device *devp = &dev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	ret = iio_channel_start_all_cb(joy->buffer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 		dev_err(devp, "Unable to start callback buffer: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) static void adc_joystick_close(struct input_dev *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	struct adc_joystick *joy = input_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	iio_channel_stop_all_cb(joy->buffer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) static void adc_joystick_cleanup(void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	iio_channel_release_all_cb(data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) static int adc_joystick_set_axes(struct device *dev, struct adc_joystick *joy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	struct adc_joystick_axis *axes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	struct fwnode_handle *child;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	int num_axes, error, i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	num_axes = device_get_child_node_count(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	if (!num_axes) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 		dev_err(dev, "Unable to find child nodes\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	if (num_axes != joy->num_chans) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 		dev_err(dev, "Got %d child nodes for %d channels\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 			num_axes, joy->num_chans);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	axes = devm_kmalloc_array(dev, num_axes, sizeof(*axes), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	if (!axes)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	device_for_each_child_node(dev, child) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 		error = fwnode_property_read_u32(child, "reg", &i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 		if (error) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 			dev_err(dev, "reg invalid or missing\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 			goto err_fwnode_put;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 		if (i >= num_axes) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 			error = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 			dev_err(dev, "No matching axis for reg %d\n", i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 			goto err_fwnode_put;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 		error = fwnode_property_read_u32(child, "linux,code",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 						 &axes[i].code);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 		if (error) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 			dev_err(dev, "linux,code invalid or missing\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 			goto err_fwnode_put;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 		error = fwnode_property_read_u32_array(child, "abs-range",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 						       axes[i].range, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 		if (error) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 			dev_err(dev, "abs-range invalid or missing\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 			goto err_fwnode_put;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		fwnode_property_read_u32(child, "abs-fuzz", &axes[i].fuzz);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 		fwnode_property_read_u32(child, "abs-flat", &axes[i].flat);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 		input_set_abs_params(joy->input, axes[i].code,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 				     axes[i].range[0], axes[i].range[1],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 				     axes[i].fuzz, axes[i].flat);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 		input_set_capability(joy->input, EV_ABS, axes[i].code);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	joy->axes = axes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) err_fwnode_put:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	fwnode_handle_put(child);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) static int adc_joystick_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	struct device *dev = &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	struct adc_joystick *joy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	struct input_dev *input;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	int bits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	joy = devm_kzalloc(dev, sizeof(*joy), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	if (!joy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	joy->chans = devm_iio_channel_get_all(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	if (IS_ERR(joy->chans)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 		error = PTR_ERR(joy->chans);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 		if (error != -EPROBE_DEFER)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 			dev_err(dev, "Unable to get IIO channels");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 		return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	/* Count how many channels we got. NULL terminated. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	for (i = 0; joy->chans[i].indio_dev; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 		bits = joy->chans[i].channel->scan_type.storagebits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 		if (!bits || bits > 16) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 			dev_err(dev, "Unsupported channel storage size\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 			return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 		if (bits != joy->chans[0].channel->scan_type.storagebits) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 			dev_err(dev, "Channels must have equal storage size\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 			return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	joy->num_chans = i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	input = devm_input_allocate_device(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	if (!input) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 		dev_err(dev, "Unable to allocate input device\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	joy->input = input;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	input->name = pdev->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	input->id.bustype = BUS_HOST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	input->open = adc_joystick_open;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	input->close = adc_joystick_close;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	error = adc_joystick_set_axes(dev, joy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 		return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	input_set_drvdata(input, joy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	error = input_register_device(input);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	if (error) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 		dev_err(dev, "Unable to register input device\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 		return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	joy->buffer = iio_channel_get_all_cb(dev, adc_joystick_handle, joy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	if (IS_ERR(joy->buffer)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 		dev_err(dev, "Unable to allocate callback buffer\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 		return PTR_ERR(joy->buffer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	error = devm_add_action_or_reset(dev, adc_joystick_cleanup, joy->buffer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	if (error)  {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 		dev_err(dev, "Unable to add action\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 		return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) static const struct of_device_id adc_joystick_of_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	{ .compatible = "adc-joystick", },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	{ }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) MODULE_DEVICE_TABLE(of, adc_joystick_of_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) static struct platform_driver adc_joystick_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	.driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 		.name = "adc-joystick",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 		.of_match_table = adc_joystick_of_match,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	.probe = adc_joystick_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) module_platform_driver(adc_joystick_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) MODULE_DESCRIPTION("Input driver for joysticks connected over ADC");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) MODULE_AUTHOR("Artur Rojek <contact@artur-rojek.eu>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) MODULE_LICENSE("GPL");