8bbe833a65
Some of the PHY and MDIO drivers refer to the COPYING file in the main directory of this archive. This is the main license for Linux, thus GPLv2 plus syscall extension. Fixup the MODULE_LICENSE() where needed and add an SDPX header for GPLv2. Cc: David Daney <david.daney@cavium.com> Signed-off-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
104 lines
2.2 KiB
C
104 lines
2.2 KiB
C
// 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 = 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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gpiod_put_array(gpios);
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return -ENOMEM;
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}
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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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gpiod_put_array(s->gpios);
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return r;
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}
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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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gpiod_put_array(s->gpios);
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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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