mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-11-02 15:43:09 +02:00
bfa2f874b9
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@18694 3c298f89-4303-0410-b956-a3cf2f4a3e73
662 lines
14 KiB
C
662 lines
14 KiB
C
/*
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* Platform driver for the Realtek RTL8366 ethernet switch
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*
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* Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/delay.h>
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#include <linux/gpio.h>
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#include <linux/spinlock.h>
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#include <linux/skbuff.h>
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#include <linux/phy.h>
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#include <linux/rtl8366_smi.h>
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//#define DEBUG 1
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#define RTL8366_SMI_DRIVER_NAME "rtl8366-smi"
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#define RTL8366_SMI_DRIVER_DESC "Realtek RTL8366 switch driver"
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#define RTL8366_SMI_DRIVER_VER "0.1.0"
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#define RTL8366S_PHY_NO_MAX 4
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#define RTL8366S_PHY_PAGE_MAX 7
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#define RTL8366S_PHY_ADDR_MAX 31
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#define RTL8366S_CHIP_VERSION_CTRL_REG 0x0104
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#define RTL8366S_CHIP_VERSION_MASK 0xf
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#define RTL8366S_CHIP_ID_REG 0x0105
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#define RTL8366S_CHIP_ID_8366 0x8366
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/* PHY registers control */
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#define RTL8366S_PHY_ACCESS_CTRL_REG 0x8028
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#define RTL8366S_PHY_ACCESS_DATA_REG 0x8029
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#define RTL8366S_PHY_CTRL_READ 1
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#define RTL8366S_PHY_CTRL_WRITE 0
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#define RTL8366S_PHY_REG_MASK 0x1f
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#define RTL8366S_PHY_PAGE_OFFSET 5
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#define RTL8366S_PHY_PAGE_MASK (0x7 << 5)
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#define RTL8366S_PHY_NO_OFFSET 9
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#define RTL8366S_PHY_NO_MASK (0x1f << 9)
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#define RTL8366_SMI_ACK_RETRY_COUNT 5
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#define RTL8366_SMI_CLK_DELAY 10 /* nsec */
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struct rtl8366_smi {
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struct platform_device *pdev;
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struct rtl8366_smi_platform_data *pdata;
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spinlock_t lock;
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struct mii_bus *mii_bus;
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int mii_irq[PHY_MAX_ADDR];
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};
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static inline void rtl8366_smi_clk_delay(struct rtl8366_smi *smi)
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{
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ndelay(RTL8366_SMI_CLK_DELAY);
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}
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static void rtl8366_smi_start(struct rtl8366_smi *smi)
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{
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unsigned int sda = smi->pdata->gpio_sda;
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unsigned int sck = smi->pdata->gpio_sck;
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/*
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* Set GPIO pins to output mode, with initial state:
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* SCK = 0, SDA = 1
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*/
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gpio_direction_output(sck, 0);
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gpio_direction_output(sda, 1);
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rtl8366_smi_clk_delay(smi);
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/* CLK 1: 0 -> 1, 1 -> 0 */
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gpio_set_value(sck, 1);
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rtl8366_smi_clk_delay(smi);
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gpio_set_value(sck, 0);
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rtl8366_smi_clk_delay(smi);
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/* CLK 2: */
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gpio_set_value(sck, 1);
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rtl8366_smi_clk_delay(smi);
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gpio_set_value(sda, 0);
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rtl8366_smi_clk_delay(smi);
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gpio_set_value(sck, 0);
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rtl8366_smi_clk_delay(smi);
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gpio_set_value(sda, 1);
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}
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static void rtl8366_smi_stop(struct rtl8366_smi *smi)
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{
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unsigned int sda = smi->pdata->gpio_sda;
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unsigned int sck = smi->pdata->gpio_sck;
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rtl8366_smi_clk_delay(smi);
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gpio_set_value(sda, 0);
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gpio_set_value(sck, 1);
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rtl8366_smi_clk_delay(smi);
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gpio_set_value(sda, 1);
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rtl8366_smi_clk_delay(smi);
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gpio_set_value(sck, 1);
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rtl8366_smi_clk_delay(smi);
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gpio_set_value(sck, 0);
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rtl8366_smi_clk_delay(smi);
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gpio_set_value(sck, 1);
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/* add a click */
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rtl8366_smi_clk_delay(smi);
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gpio_set_value(sck, 0);
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rtl8366_smi_clk_delay(smi);
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gpio_set_value(sck, 1);
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/* set GPIO pins to input mode */
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gpio_direction_input(sda);
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gpio_direction_input(sck);
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}
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static void rtl8366_smi_write_bits(struct rtl8366_smi *smi, u32 data, u32 len)
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{
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unsigned int sda = smi->pdata->gpio_sda;
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unsigned int sck = smi->pdata->gpio_sck;
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for (; len > 0; len--) {
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rtl8366_smi_clk_delay(smi);
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/* prepare data */
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if ( data & ( 1 << (len - 1)) )
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gpio_set_value(sda, 1);
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else
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gpio_set_value(sda, 0);
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rtl8366_smi_clk_delay(smi);
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/* clocking */
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gpio_set_value(sck, 1);
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rtl8366_smi_clk_delay(smi);
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gpio_set_value(sck, 0);
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}
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}
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static void rtl8366_smi_read_bits(struct rtl8366_smi *smi, u32 len, u32 *data)
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{
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unsigned int sda = smi->pdata->gpio_sda;
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unsigned int sck = smi->pdata->gpio_sck;
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gpio_direction_input(sda);
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for (*data = 0; len > 0; len--) {
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u32 u;
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rtl8366_smi_clk_delay(smi);
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/* clocking */
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gpio_set_value(sck, 1);
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rtl8366_smi_clk_delay(smi);
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u = gpio_get_value(sda);
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gpio_set_value(sck, 0);
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*data |= (u << (len - 1));
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}
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gpio_direction_output(sda, 0);
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}
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static int rtl8366_smi_wait_for_ack(struct rtl8366_smi *smi)
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{
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int retry_cnt;
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retry_cnt = 0;
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do {
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u32 ack;
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rtl8366_smi_read_bits(smi, 1, &ack);
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if (ack == 0)
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break;
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if (++retry_cnt > RTL8366_SMI_ACK_RETRY_COUNT)
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return -EIO;
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} while (1);
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return 0;
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}
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static int rtl8366_smi_write_byte(struct rtl8366_smi *smi, u8 data)
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{
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rtl8366_smi_write_bits(smi, data, 8);
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return rtl8366_smi_wait_for_ack(smi);
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}
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static int rtl8366_smi_read_byte0(struct rtl8366_smi *smi, u8 *data)
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{
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u32 t;
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/* read data */
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rtl8366_smi_read_bits(smi, 8, &t);
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*data = (t & 0xff);
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/* send an ACK */
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rtl8366_smi_write_bits(smi, 0x00, 1);
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return 0;
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}
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static int rtl8366_smi_read_byte1(struct rtl8366_smi *smi, u8 *data)
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{
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u32 t;
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/* read data */
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rtl8366_smi_read_bits(smi, 8, &t);
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*data = (t & 0xff);
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/* send an ACK */
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rtl8366_smi_write_bits(smi, 0x01, 1);
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return 0;
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}
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static int rtl8366_smi_read_reg(struct rtl8366_smi *smi, u32 addr, u32 *data)
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{
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unsigned long flags;
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u8 lo = 0;
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u8 hi = 0;
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int ret;
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spin_lock_irqsave(&smi->lock, flags);
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rtl8366_smi_start(smi);
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/* send READ command */
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ret = rtl8366_smi_write_byte(smi, 0x0a << 4 | 0x04 << 1 | 0x01);
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if (ret)
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goto out;
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/* set ADDR[7:0] */
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ret = rtl8366_smi_write_byte(smi, addr & 0xff);
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if (ret)
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goto out;
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/* set ADDR[15:8] */
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ret = rtl8366_smi_write_byte(smi, addr >> 8);
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if (ret)
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goto out;
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/* read DATA[7:0] */
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rtl8366_smi_read_byte0(smi, &lo);
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/* read DATA[15:8] */
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rtl8366_smi_read_byte1(smi, &hi);
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*data = ((u32) lo) | (((u32) hi) << 8);
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ret = 0;
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out:
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rtl8366_smi_stop(smi);
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spin_unlock_irqrestore(&smi->lock, flags);
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return ret;
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}
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static int rtl8366_smi_write_reg(struct rtl8366_smi *smi, u32 addr, u32 data)
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{
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unsigned long flags;
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int ret;
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spin_lock_irqsave(&smi->lock, flags);
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rtl8366_smi_start(smi);
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/* send WRITE command */
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ret = rtl8366_smi_write_byte(smi, 0x0a << 4 | 0x04 << 1 | 0x00);
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if (ret)
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goto out;
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/* set ADDR[7:0] */
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ret = rtl8366_smi_write_byte(smi, addr & 0xff);
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if (ret)
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goto out;
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/* set ADDR[15:8] */
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ret = rtl8366_smi_write_byte(smi, addr >> 8);
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if (ret)
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goto out;
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/* write DATA[7:0] */
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ret = rtl8366_smi_write_byte(smi, data & 0xff);
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if (ret)
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goto out;
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/* write DATA[15:8] */
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ret = rtl8366_smi_write_byte(smi, data >> 8);
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if (ret)
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goto out;
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ret = 0;
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out:
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rtl8366_smi_stop(smi);
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spin_unlock_irqrestore(&smi->lock, flags);
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return ret;
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}
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static int rtl8366_smi_read_phy_reg(struct rtl8366_smi *smi,
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u32 phy_no, u32 page, u32 addr, u32 *data)
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{
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u32 reg;
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int ret;
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if (phy_no > RTL8366S_PHY_NO_MAX)
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return -EINVAL;
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if (page > RTL8366S_PHY_PAGE_MAX)
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return -EINVAL;
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if (addr > RTL8366S_PHY_ADDR_MAX)
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return -EINVAL;
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ret = rtl8366_smi_write_reg(smi, RTL8366S_PHY_ACCESS_CTRL_REG,
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RTL8366S_PHY_CTRL_READ);
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if (ret)
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return ret;
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reg = 0x8000 | (1 << (phy_no + RTL8366S_PHY_NO_OFFSET)) |
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((page << RTL8366S_PHY_PAGE_OFFSET) & RTL8366S_PHY_PAGE_MASK) |
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(addr & RTL8366S_PHY_REG_MASK);
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ret = rtl8366_smi_write_reg(smi, reg, 0);
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if (ret)
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return ret;
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ret = rtl8366_smi_read_reg(smi, RTL8366S_PHY_ACCESS_DATA_REG, data);
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if (ret)
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return ret;
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return 0;
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}
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static int rtl8366_smi_write_phy_reg(struct rtl8366_smi *smi,
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u32 phy_no, u32 page, u32 addr, u32 data)
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{
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u32 reg;
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int ret;
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if (phy_no > RTL8366S_PHY_NO_MAX)
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return -EINVAL;
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if (page > RTL8366S_PHY_PAGE_MAX)
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return -EINVAL;
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if (addr > RTL8366S_PHY_ADDR_MAX)
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return -EINVAL;
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ret = rtl8366_smi_write_reg(smi, RTL8366S_PHY_ACCESS_CTRL_REG,
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RTL8366S_PHY_CTRL_WRITE);
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if (ret)
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return ret;
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reg = 0x8000 | (1 << (phy_no + RTL8366S_PHY_NO_OFFSET)) |
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((page << RTL8366S_PHY_PAGE_OFFSET) & RTL8366S_PHY_PAGE_MASK) |
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(addr & RTL8366S_PHY_REG_MASK);
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ret = rtl8366_smi_write_reg(smi, reg, data);
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if (ret)
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return ret;
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return 0;
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}
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#ifdef DEBUG
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static void rtl8366_smi_dump_regs(struct rtl8366_smi *smi)
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{
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u32 t;
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int err;
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int i;
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for (i = 0; i < 0x200; i++) {
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err = rtl8366_smi_read_reg(smi, i, &t);
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if (err) {
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dev_err(&smi->pdev->dev,
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"unable to read register %04x\n", i);
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return;
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}
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dev_info(&smi->pdev->dev, "reg %04x: %04x\n", i, t);
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}
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for (i = 0; i <= RTL8366S_PHY_NO_MAX; i++) {
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int j;
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for (j = 0; j <= RTL8366S_PHY_ADDR_MAX; j++) {
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err = rtl8366_smi_read_phy_reg(smi, i, 0, j, &t);
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if (err) {
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dev_err(&smi->pdev->dev,
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"unable to read PHY%u:%02x register\n",
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i, j);
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return;
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}
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dev_info(&smi->pdev->dev,
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"PHY%u:%02x: %04x\n", i, j, t);
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}
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}
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}
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#else
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static inline void rtl8366_smi_dump_regs(struct rtl8366_smi *smi) {}
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#endif
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static int rtl8366_smi_mii_read(struct mii_bus *bus, int addr, int reg)
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{
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struct rtl8366_smi *smi = bus->priv;
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u32 val = 0;
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int err;
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err = rtl8366_smi_read_phy_reg(smi, addr, 0, reg, &val);
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if (err)
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return 0xffff;
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return val;
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}
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static int rtl8366_smi_mii_write(struct mii_bus *bus, int addr, int reg,
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u16 val)
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{
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struct rtl8366_smi *smi = bus->priv;
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u32 t;
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int err;
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err = rtl8366_smi_write_phy_reg(smi, addr, 0, reg, val);
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/* flush write */
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(void) rtl8366_smi_read_phy_reg(smi, addr, 0, reg, &t);
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return err;
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}
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static int rtl8366_smi_mii_init(struct rtl8366_smi *smi)
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{
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int ret;
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int i;
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smi->mii_bus = mdiobus_alloc();
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if (smi->mii_bus == NULL) {
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ret = -ENOMEM;
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goto err;
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}
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spin_lock_init(&smi->lock);
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smi->mii_bus->priv = (void *) smi;
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smi->mii_bus->name = "rtl8366-smi";
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smi->mii_bus->read = rtl8366_smi_mii_read;
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smi->mii_bus->write = rtl8366_smi_mii_write;
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snprintf(smi->mii_bus->id, MII_BUS_ID_SIZE, "%s",
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dev_name(&smi->pdev->dev));
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smi->mii_bus->parent = &smi->pdev->dev;
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smi->mii_bus->phy_mask = ~(0x1f);
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smi->mii_bus->irq = smi->mii_irq;
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for (i = 0; i < PHY_MAX_ADDR; i++)
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smi->mii_irq[i] = PHY_POLL;
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rtl8366_smi_dump_regs(smi);
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ret = mdiobus_register(smi->mii_bus);
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if (ret)
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goto err_free;
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rtl8366_smi_dump_regs(smi);
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return 0;
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err_free:
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mdiobus_free(smi->mii_bus);
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err:
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return ret;
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}
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static void rtl8366_smi_mii_cleanup(struct rtl8366_smi *smi)
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{
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mdiobus_unregister(smi->mii_bus);
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mdiobus_free(smi->mii_bus);
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}
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static int rtl8366_smi_setup(struct rtl8366_smi *smi)
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{
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u32 chip_id = 0;
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u32 chip_ver = 0;
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int ret;
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ret = rtl8366_smi_read_reg(smi, RTL8366S_CHIP_ID_REG, &chip_id);
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if (ret) {
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dev_err(&smi->pdev->dev, "unable to read chip id\n");
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return ret;
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}
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switch (chip_id) {
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case RTL8366S_CHIP_ID_8366:
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break;
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default:
|
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dev_err(&smi->pdev->dev, "unknown chip id (%04x)\n", chip_id);
|
|
return -ENODEV;
|
|
}
|
|
|
|
ret = rtl8366_smi_read_reg(smi, RTL8366S_CHIP_VERSION_CTRL_REG,
|
|
&chip_ver);
|
|
if (ret) {
|
|
dev_err(&smi->pdev->dev, "unable to read chip version\n");
|
|
return ret;
|
|
}
|
|
|
|
dev_info(&smi->pdev->dev, "RTL%04x ver. %u chip found\n",
|
|
chip_id, chip_ver & RTL8366S_CHIP_VERSION_MASK);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __init rtl8366_smi_probe(struct platform_device *pdev)
|
|
{
|
|
static int rtl8366_smi_version_printed;
|
|
struct rtl8366_smi_platform_data *pdata;
|
|
struct rtl8366_smi *smi;
|
|
int err;
|
|
|
|
if (!rtl8366_smi_version_printed++)
|
|
printk(KERN_NOTICE RTL8366_SMI_DRIVER_DESC
|
|
" version " RTL8366_SMI_DRIVER_VER"\n");
|
|
|
|
pdata = pdev->dev.platform_data;
|
|
if (!pdata) {
|
|
dev_err(&pdev->dev, "no platform data specified\n");
|
|
err = -EINVAL;
|
|
goto err_out;
|
|
}
|
|
|
|
smi = kzalloc(sizeof(struct rtl8366_smi), GFP_KERNEL);
|
|
if (!smi) {
|
|
dev_err(&pdev->dev, "no memory for private data\n");
|
|
err = -ENOMEM;
|
|
goto err_out;
|
|
}
|
|
|
|
err = gpio_request(pdata->gpio_sda, dev_name(&pdev->dev));
|
|
if (err) {
|
|
dev_err(&pdev->dev, "gpio_request failed for %u, err=%d\n",
|
|
pdata->gpio_sda, err);
|
|
goto err_free_smi;
|
|
}
|
|
|
|
err = gpio_request(pdata->gpio_sck, dev_name(&pdev->dev));
|
|
if (err) {
|
|
dev_err(&pdev->dev, "gpio_request failed for %u, err=%d\n",
|
|
pdata->gpio_sck, err);
|
|
goto err_free_sda;
|
|
}
|
|
|
|
smi->pdev = pdev;
|
|
smi->pdata = pdata;
|
|
spin_lock_init(&smi->lock);
|
|
|
|
platform_set_drvdata(pdev, smi);
|
|
|
|
dev_info(&pdev->dev, "using GPIO pins %u (SDA) and %u (SCK)\n",
|
|
pdata->gpio_sda, pdata->gpio_sck);
|
|
|
|
err = rtl8366_smi_setup(smi);
|
|
if (err)
|
|
goto err_clear_drvdata;
|
|
|
|
err = rtl8366_smi_mii_init(smi);
|
|
if (err)
|
|
goto err_clear_drvdata;
|
|
|
|
return 0;
|
|
|
|
err_clear_drvdata:
|
|
platform_set_drvdata(pdev, NULL);
|
|
gpio_free(pdata->gpio_sck);
|
|
err_free_sda:
|
|
gpio_free(pdata->gpio_sda);
|
|
err_free_smi:
|
|
kfree(smi);
|
|
err_out:
|
|
return err;
|
|
}
|
|
|
|
static int __devexit rtl8366_smi_remove(struct platform_device *pdev)
|
|
{
|
|
struct rtl8366_smi *smi = platform_get_drvdata(pdev);
|
|
|
|
if (smi) {
|
|
struct rtl8366_smi_platform_data *pdata;
|
|
|
|
pdata = pdev->dev.platform_data;
|
|
|
|
rtl8366_smi_mii_cleanup(smi);
|
|
platform_set_drvdata(pdev, NULL);
|
|
gpio_free(pdata->gpio_sck);
|
|
gpio_free(pdata->gpio_sda);
|
|
kfree(smi);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int rtl8366_phy_config_aneg(struct phy_device *phydev)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver rtl8366_smi_driver = {
|
|
.driver = {
|
|
.name = RTL8366_SMI_DRIVER_NAME,
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.probe = rtl8366_smi_probe,
|
|
.remove = __devexit_p(rtl8366_smi_remove),
|
|
};
|
|
|
|
static struct phy_driver rtl8366_smi_phy_driver = {
|
|
.phy_id = 0x001cc960,
|
|
.name = "Realtek RTL8366",
|
|
.phy_id_mask = 0x1ffffff0,
|
|
.features = PHY_GBIT_FEATURES,
|
|
.config_aneg = rtl8366_phy_config_aneg,
|
|
.read_status = genphy_read_status,
|
|
.driver = {
|
|
.owner = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
static int __init rtl8366_smi_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = phy_driver_register(&rtl8366_smi_phy_driver);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = platform_driver_register(&rtl8366_smi_driver);
|
|
if (ret)
|
|
goto err_phy_unregister;
|
|
|
|
return 0;
|
|
|
|
err_phy_unregister:
|
|
phy_driver_unregister(&rtl8366_smi_phy_driver);
|
|
return ret;
|
|
}
|
|
module_init(rtl8366_smi_init);
|
|
|
|
static void __exit rtl8366_smi_exit(void)
|
|
{
|
|
platform_driver_unregister(&rtl8366_smi_driver);
|
|
phy_driver_unregister(&rtl8366_smi_phy_driver);
|
|
}
|
|
module_exit(rtl8366_smi_exit);
|
|
|
|
MODULE_DESCRIPTION(RTL8366_SMI_DRIVER_DESC);
|
|
MODULE_VERSION(RTL8366_SMI_DRIVER_VER);
|
|
MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_ALIAS("platform:" RTL8366_SMI_DRIVER_NAME);
|