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Linux/drivers/net/phy/mdio-mux-gpio.c

  1 /*
  2  * This file is subject to the terms and conditions of the GNU General Public
  3  * License.  See the file "COPYING" in the main directory of this archive
  4  * for more details.
  5  *
  6  * Copyright (C) 2011, 2012 Cavium, Inc.
  7  */
  8 
  9 #include <linux/platform_device.h>
 10 #include <linux/device.h>
 11 #include <linux/of_mdio.h>
 12 #include <linux/module.h>
 13 #include <linux/phy.h>
 14 #include <linux/mdio-mux.h>
 15 #include <linux/gpio/consumer.h>
 16 
 17 #define DRV_VERSION "1.1"
 18 #define DRV_DESCRIPTION "GPIO controlled MDIO bus multiplexer driver"
 19 
 20 struct mdio_mux_gpio_state {
 21         struct gpio_descs *gpios;
 22         void *mux_handle;
 23 };
 24 
 25 static int mdio_mux_gpio_switch_fn(int current_child, int desired_child,
 26                                    void *data)
 27 {
 28         struct mdio_mux_gpio_state *s = data;
 29         int values[s->gpios->ndescs];
 30         unsigned int n;
 31 
 32         if (current_child == desired_child)
 33                 return 0;
 34 
 35         for (n = 0; n < s->gpios->ndescs; n++)
 36                 values[n] = (desired_child >> n) & 1;
 37 
 38         gpiod_set_array_value_cansleep(s->gpios->ndescs, s->gpios->desc,
 39                                        values);
 40 
 41         return 0;
 42 }
 43 
 44 static int mdio_mux_gpio_probe(struct platform_device *pdev)
 45 {
 46         struct mdio_mux_gpio_state *s;
 47         int r;
 48 
 49         s = devm_kzalloc(&pdev->dev, sizeof(*s), GFP_KERNEL);
 50         if (!s)
 51                 return -ENOMEM;
 52 
 53         s->gpios = gpiod_get_array(&pdev->dev, NULL, GPIOD_OUT_LOW);
 54         if (IS_ERR(s->gpios))
 55                 return PTR_ERR(s->gpios);
 56 
 57         r = mdio_mux_init(&pdev->dev,
 58                           mdio_mux_gpio_switch_fn, &s->mux_handle, s);
 59 
 60         if (r != 0) {
 61                 gpiod_put_array(s->gpios);
 62                 return r;
 63         }
 64 
 65         pdev->dev.platform_data = s;
 66         return 0;
 67 }
 68 
 69 static int mdio_mux_gpio_remove(struct platform_device *pdev)
 70 {
 71         struct mdio_mux_gpio_state *s = dev_get_platdata(&pdev->dev);
 72         mdio_mux_uninit(s->mux_handle);
 73         gpiod_put_array(s->gpios);
 74         return 0;
 75 }
 76 
 77 static const struct of_device_id mdio_mux_gpio_match[] = {
 78         {
 79                 .compatible = "mdio-mux-gpio",
 80         },
 81         {
 82                 /* Legacy compatible property. */
 83                 .compatible = "cavium,mdio-mux-sn74cbtlv3253",
 84         },
 85         {},
 86 };
 87 MODULE_DEVICE_TABLE(of, mdio_mux_gpio_match);
 88 
 89 static struct platform_driver mdio_mux_gpio_driver = {
 90         .driver = {
 91                 .name           = "mdio-mux-gpio",
 92                 .of_match_table = mdio_mux_gpio_match,
 93         },
 94         .probe          = mdio_mux_gpio_probe,
 95         .remove         = mdio_mux_gpio_remove,
 96 };
 97 
 98 module_platform_driver(mdio_mux_gpio_driver);
 99 
100 MODULE_DESCRIPTION(DRV_DESCRIPTION);
101 MODULE_VERSION(DRV_VERSION);
102 MODULE_AUTHOR("David Daney");
103 MODULE_LICENSE("GPL");
104 

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