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98 lines
2.1 KiB
98 lines
2.1 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (C) 2011, 2012 Cavium, Inc. |
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*/ |
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#include <linux/platform_device.h> |
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#include <linux/device.h> |
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#include <linux/of_mdio.h> |
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#include <linux/module.h> |
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#include <linux/phy.h> |
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#include <linux/mdio-mux.h> |
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#include <linux/gpio/consumer.h> |
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#define DRV_VERSION "1.1" |
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#define DRV_DESCRIPTION "GPIO controlled MDIO bus multiplexer driver" |
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struct mdio_mux_gpio_state { |
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struct gpio_descs *gpios; |
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void *mux_handle; |
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}; |
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static int mdio_mux_gpio_switch_fn(int current_child, int desired_child, |
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void *data) |
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{ |
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struct mdio_mux_gpio_state *s = data; |
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DECLARE_BITMAP(values, BITS_PER_TYPE(desired_child)); |
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if (current_child == desired_child) |
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return 0; |
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values[0] = desired_child; |
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gpiod_set_array_value_cansleep(s->gpios->ndescs, s->gpios->desc, |
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s->gpios->info, values); |
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return 0; |
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} |
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static int mdio_mux_gpio_probe(struct platform_device *pdev) |
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{ |
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struct mdio_mux_gpio_state *s; |
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struct gpio_descs *gpios; |
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int r; |
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gpios = devm_gpiod_get_array(&pdev->dev, NULL, GPIOD_OUT_LOW); |
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if (IS_ERR(gpios)) |
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return PTR_ERR(gpios); |
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s = devm_kzalloc(&pdev->dev, sizeof(*s), GFP_KERNEL); |
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if (!s) |
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return -ENOMEM; |
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s->gpios = gpios; |
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r = mdio_mux_init(&pdev->dev, pdev->dev.of_node, |
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mdio_mux_gpio_switch_fn, &s->mux_handle, s, NULL); |
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if (r != 0) |
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return r; |
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pdev->dev.platform_data = s; |
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return 0; |
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} |
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static int mdio_mux_gpio_remove(struct platform_device *pdev) |
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{ |
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struct mdio_mux_gpio_state *s = dev_get_platdata(&pdev->dev); |
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mdio_mux_uninit(s->mux_handle); |
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return 0; |
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} |
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static const struct of_device_id mdio_mux_gpio_match[] = { |
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{ |
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.compatible = "mdio-mux-gpio", |
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}, |
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{ |
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/* Legacy compatible property. */ |
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.compatible = "cavium,mdio-mux-sn74cbtlv3253", |
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}, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(of, mdio_mux_gpio_match); |
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static struct platform_driver mdio_mux_gpio_driver = { |
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.driver = { |
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.name = "mdio-mux-gpio", |
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.of_match_table = mdio_mux_gpio_match, |
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}, |
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.probe = mdio_mux_gpio_probe, |
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.remove = mdio_mux_gpio_remove, |
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}; |
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module_platform_driver(mdio_mux_gpio_driver); |
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MODULE_DESCRIPTION(DRV_DESCRIPTION); |
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MODULE_VERSION(DRV_VERSION); |
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MODULE_AUTHOR("David Daney"); |
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MODULE_LICENSE("GPL v2");
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