diff options
Diffstat (limited to 'kernel/drivers/net/phy/mdio-mux-gpio.c')
-rw-r--r-- | kernel/drivers/net/phy/mdio-mux-gpio.c | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/kernel/drivers/net/phy/mdio-mux-gpio.c b/kernel/drivers/net/phy/mdio-mux-gpio.c new file mode 100644 index 000000000..66edd99bc --- /dev/null +++ b/kernel/drivers/net/phy/mdio-mux-gpio.c @@ -0,0 +1,102 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 2011, 2012 Cavium, Inc. + */ + +#include <linux/platform_device.h> +#include <linux/device.h> +#include <linux/of_mdio.h> +#include <linux/module.h> +#include <linux/phy.h> +#include <linux/mdio-mux.h> +#include <linux/gpio/consumer.h> + +#define DRV_VERSION "1.1" +#define DRV_DESCRIPTION "GPIO controlled MDIO bus multiplexer driver" + +struct mdio_mux_gpio_state { + struct gpio_descs *gpios; + void *mux_handle; +}; + +static int mdio_mux_gpio_switch_fn(int current_child, int desired_child, + void *data) +{ + struct mdio_mux_gpio_state *s = data; + int values[s->gpios->ndescs]; + unsigned int n; + + if (current_child == desired_child) + return 0; + + for (n = 0; n < s->gpios->ndescs; n++) + values[n] = (desired_child >> n) & 1; + + gpiod_set_array_cansleep(s->gpios->ndescs, s->gpios->desc, values); + + return 0; +} + +static int mdio_mux_gpio_probe(struct platform_device *pdev) +{ + struct mdio_mux_gpio_state *s; + int r; + + s = devm_kzalloc(&pdev->dev, sizeof(*s), GFP_KERNEL); + if (!s) + return -ENOMEM; + + s->gpios = gpiod_get_array(&pdev->dev, NULL, GPIOD_OUT_LOW); + if (IS_ERR(s->gpios)) + return PTR_ERR(s->gpios); + + r = mdio_mux_init(&pdev->dev, + mdio_mux_gpio_switch_fn, &s->mux_handle, s); + + if (r != 0) { + gpiod_put_array(s->gpios); + return r; + } + + pdev->dev.platform_data = s; + return 0; +} + +static int mdio_mux_gpio_remove(struct platform_device *pdev) +{ + struct mdio_mux_gpio_state *s = dev_get_platdata(&pdev->dev); + mdio_mux_uninit(s->mux_handle); + gpiod_put_array(s->gpios); + return 0; +} + +static const struct of_device_id mdio_mux_gpio_match[] = { + { + .compatible = "mdio-mux-gpio", + }, + { + /* Legacy compatible property. */ + .compatible = "cavium,mdio-mux-sn74cbtlv3253", + }, + {}, +}; +MODULE_DEVICE_TABLE(of, mdio_mux_gpio_match); + +static struct platform_driver mdio_mux_gpio_driver = { + .driver = { + .name = "mdio-mux-gpio", + .of_match_table = mdio_mux_gpio_match, + }, + .probe = mdio_mux_gpio_probe, + .remove = mdio_mux_gpio_remove, +}; + +module_platform_driver(mdio_mux_gpio_driver); + +MODULE_DESCRIPTION(DRV_DESCRIPTION); +MODULE_VERSION(DRV_VERSION); +MODULE_AUTHOR("David Daney"); +MODULE_LICENSE("GPL"); |