1 // SPDX-License-Identifier: GPL-2.0-only
3  * Copyright (C) 2016 Texas Instruments Incorporated - http://www.ti.com/
24 static int gpio_decoder_get_gpios_state(struct gpio_decoder *decoder)  in gpio_decoder_get_gpios_state()
26 	struct gpio_descs *gpios = decoder->input_gpios;  in gpio_decoder_get_gpios_state()  local
27 	unsigned int ret = 0;  in gpio_decoder_get_gpios_state()
28 	int i, val;  in gpio_decoder_get_gpios_state()
30 	for (i = 0; i < gpios->ndescs; i++) {  in gpio_decoder_get_gpios_state()
31 		val = gpiod_get_value_cansleep(gpios->desc[i]);  in gpio_decoder_get_gpios_state()
33 			dev_err(decoder->dev,  in gpio_decoder_get_gpios_state()
35 				desc_to_gpio(gpios->desc[i]), val);  in gpio_decoder_get_gpios_state()
49 	int state;  in gpio_decoder_poll_gpios()
52 	if (state >= 0 && state != decoder->last_stable) {  in gpio_decoder_poll_gpios()
53 		input_report_abs(input, decoder->axis, state);  in gpio_decoder_poll_gpios()
55 		decoder->last_stable = state;  in gpio_decoder_poll_gpios()
59 static int gpio_decoder_probe(struct platform_device *pdev)  in gpio_decoder_probe()
61 	struct device *dev = &pdev->dev;  in gpio_decoder_probe()
65 	int err;  in gpio_decoder_probe()
69 		return -ENOMEM;  in gpio_decoder_probe()
71 	decoder->dev = dev;  in gpio_decoder_probe()
72 	device_property_read_u32(dev, "linux,axis", &decoder->axis);  in gpio_decoder_probe()
74 	decoder->input_gpios = devm_gpiod_get_array(dev, NULL, GPIOD_IN);  in gpio_decoder_probe()
75 	if (IS_ERR(decoder->input_gpios)) {  in gpio_decoder_probe()
76 		dev_err(dev, "unable to acquire input gpios\n");  in gpio_decoder_probe()
77 		return PTR_ERR(decoder->input_gpios);  in gpio_decoder_probe()
80 	if (decoder->input_gpios->ndescs < 2) {  in gpio_decoder_probe()
81 		dev_err(dev, "not enough gpios found\n");  in gpio_decoder_probe()
82 		return -EINVAL;  in gpio_decoder_probe()
85 	if (device_property_read_u32(dev, "decoder-max-value", &max))  in gpio_decoder_probe()
86 		max = (1U << decoder->input_gpios->ndescs) - 1;  in gpio_decoder_probe()
90 		return -ENOMEM;  in gpio_decoder_probe()
94 	input->name = pdev->name;  in gpio_decoder_probe()
95 	input->id.bustype = BUS_HOST;  in gpio_decoder_probe()
96 	input_set_abs_params(input, decoder->axis, 0, max, 0, 0);  in gpio_decoder_probe()
115 	{ .compatible = "gpio-decoder", },
124 		.name	= "gpio-decoder",