304 lines
7.0 KiB
C
304 lines
7.0 KiB
C
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/*
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* Driver for SMSC USB3503 USB 2.0 hub controller driver
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*
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* Copyright (c) 2012-2013 Dongjin Kim (tobetter@gmail.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/i2c.h>
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#include <linux/gpio.h>
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#include <linux/delay.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/platform_data/usb3503.h>
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#define USB3503_VIDL 0x00
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#define USB3503_VIDM 0x01
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#define USB3503_PIDL 0x02
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#define USB3503_PIDM 0x03
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#define USB3503_DIDL 0x04
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#define USB3503_DIDM 0x05
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#define USB3503_CFG1 0x06
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#define USB3503_SELF_BUS_PWR (1 << 7)
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#define USB3503_CFG2 0x07
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#define USB3503_CFG3 0x08
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#define USB3503_NRD 0x09
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#define USB3503_PDS 0x0a
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#define USB3503_PORT1 (1 << 1)
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#define USB3503_PORT2 (1 << 2)
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#define USB3503_PORT3 (1 << 3)
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#define USB3503_SP_ILOCK 0xe7
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#define USB3503_SPILOCK_CONNECT (1 << 1)
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#define USB3503_SPILOCK_CONFIG (1 << 0)
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#define USB3503_CFGP 0xee
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#define USB3503_CLKSUSP (1 << 7)
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struct usb3503 {
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enum usb3503_mode mode;
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struct i2c_client *client;
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int gpio_intn;
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int gpio_reset;
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int gpio_connect;
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};
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static int usb3503_write_register(struct i2c_client *client,
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char reg, char data)
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{
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return i2c_smbus_write_byte_data(client, reg, data);
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}
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static int usb3503_read_register(struct i2c_client *client, char reg)
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{
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return i2c_smbus_read_byte_data(client, reg);
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}
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static int usb3503_set_bits(struct i2c_client *client, char reg, char req)
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{
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int err;
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err = usb3503_read_register(client, reg);
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if (err < 0)
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return err;
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err = usb3503_write_register(client, reg, err | req);
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if (err < 0)
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return err;
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return 0;
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}
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static int usb3503_clear_bits(struct i2c_client *client, char reg, char req)
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{
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int err;
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err = usb3503_read_register(client, reg);
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if (err < 0)
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return err;
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err = usb3503_write_register(client, reg, err & ~req);
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if (err < 0)
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return err;
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return 0;
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}
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static int usb3503_reset(int gpio_reset, int state)
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{
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if (gpio_is_valid(gpio_reset))
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gpio_set_value(gpio_reset, state);
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/* Wait RefClk when RESET_N is released, otherwise Hub will
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* not transition to Hub Communication Stage.
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*/
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if (state)
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msleep(100);
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return 0;
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}
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static int usb3503_switch_mode(struct usb3503 *hub, enum usb3503_mode mode)
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{
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struct i2c_client *i2c = hub->client;
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int err = 0;
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switch (mode) {
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case USB3503_MODE_HUB:
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usb3503_reset(hub->gpio_reset, 1);
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/* SP_ILOCK: set connect_n, config_n for config */
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err = usb3503_write_register(i2c, USB3503_SP_ILOCK,
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(USB3503_SPILOCK_CONNECT
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| USB3503_SPILOCK_CONFIG));
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if (err < 0) {
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dev_err(&i2c->dev, "SP_ILOCK failed (%d)\n", err);
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goto err_hubmode;
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}
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/* PDS : Port2,3 Disable For Self Powered Operation */
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err = usb3503_set_bits(i2c, USB3503_PDS,
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(USB3503_PORT2 | USB3503_PORT3));
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if (err < 0) {
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dev_err(&i2c->dev, "PDS failed (%d)\n", err);
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goto err_hubmode;
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}
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/* CFG1 : SELF_BUS_PWR -> Self-Powerd operation */
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err = usb3503_set_bits(i2c, USB3503_CFG1, USB3503_SELF_BUS_PWR);
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if (err < 0) {
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dev_err(&i2c->dev, "CFG1 failed (%d)\n", err);
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goto err_hubmode;
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}
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/* SP_LOCK: clear connect_n, config_n for hub connect */
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err = usb3503_clear_bits(i2c, USB3503_SP_ILOCK,
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(USB3503_SPILOCK_CONNECT
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| USB3503_SPILOCK_CONFIG));
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if (err < 0) {
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dev_err(&i2c->dev, "SP_ILOCK failed (%d)\n", err);
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goto err_hubmode;
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}
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hub->mode = mode;
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dev_info(&i2c->dev, "switched to HUB mode\n");
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break;
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case USB3503_MODE_STANDBY:
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usb3503_reset(hub->gpio_reset, 0);
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hub->mode = mode;
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dev_info(&i2c->dev, "switched to STANDBY mode\n");
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break;
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default:
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dev_err(&i2c->dev, "unknown mode is request\n");
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err = -EINVAL;
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break;
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}
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err_hubmode:
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return err;
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}
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int usb3503_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
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{
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struct usb3503_platform_data *pdata = i2c->dev.platform_data;
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struct usb3503 *hub;
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int err;
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hub = kzalloc(sizeof(struct usb3503), GFP_KERNEL);
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if (!hub) {
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dev_err(&i2c->dev, "private data alloc fail\n");
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return -ENOMEM;
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}
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i2c_set_clientdata(i2c, hub);
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hub->client = i2c;
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if (!pdata) {
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dev_dbg(&i2c->dev, "missing platform data\n");
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} else {
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hub->gpio_intn = pdata->gpio_intn;
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hub->gpio_connect = pdata->gpio_connect;
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hub->gpio_reset = pdata->gpio_reset;
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hub->mode = pdata->initial_mode;
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}
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if (gpio_is_valid(hub->gpio_intn)) {
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err = gpio_request_one(hub->gpio_intn,
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GPIOF_OUT_INIT_HIGH, "usb3503 intn");
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if (err) {
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dev_err(&i2c->dev,
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"unable to request GPIO %d as connect pin (%d)\n",
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hub->gpio_intn, err);
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goto err_gpio_intn;
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}
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}
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if (gpio_is_valid(hub->gpio_connect)) {
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err = gpio_request_one(hub->gpio_connect,
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GPIOF_OUT_INIT_HIGH, "usb3503 connect");
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if (err) {
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dev_err(&i2c->dev,
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"unable to request GPIO %d as connect pin (%d)\n",
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hub->gpio_connect, err);
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goto err_gpio_connect;
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}
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}
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if (gpio_is_valid(hub->gpio_reset)) {
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err = gpio_request_one(hub->gpio_reset,
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GPIOF_OUT_INIT_LOW, "usb3503 reset");
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if (err) {
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dev_err(&i2c->dev,
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"unable to request GPIO %d as reset pin (%d)\n",
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hub->gpio_reset, err);
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goto err_gpio_reset;
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}
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}
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usb3503_switch_mode(hub, pdata->initial_mode);
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dev_info(&i2c->dev, "%s: probed on %s mode\n", __func__,
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(hub->mode == USB3503_MODE_HUB) ? "hub" : "standby");
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return 0;
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err_gpio_reset:
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if (gpio_is_valid(hub->gpio_connect))
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gpio_free(hub->gpio_connect);
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err_gpio_connect:
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if (gpio_is_valid(hub->gpio_intn))
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gpio_free(hub->gpio_intn);
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err_gpio_intn:
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kfree(hub);
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return err;
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}
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static int usb3503_remove(struct i2c_client *i2c)
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{
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struct usb3503 *hub = i2c_get_clientdata(i2c);
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if (gpio_is_valid(hub->gpio_intn))
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gpio_free(hub->gpio_intn);
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if (gpio_is_valid(hub->gpio_connect))
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gpio_free(hub->gpio_connect);
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if (gpio_is_valid(hub->gpio_reset))
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gpio_free(hub->gpio_reset);
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kfree(hub);
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return 0;
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}
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static const struct i2c_device_id usb3503_id[] = {
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{ USB3503_I2C_NAME, 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, usb3503_id);
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static struct i2c_driver usb3503_driver = {
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.driver = {
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.name = USB3503_I2C_NAME,
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},
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.probe = usb3503_probe,
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.remove = usb3503_remove,
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.id_table = usb3503_id,
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};
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static int __init usb3503_init(void)
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{
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return i2c_add_driver(&usb3503_driver);
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}
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static void __exit usb3503_exit(void)
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{
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i2c_del_driver(&usb3503_driver);
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}
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module_init(usb3503_init);
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module_exit(usb3503_exit);
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MODULE_AUTHOR("Dongjin Kim <tobetter@gmail.com>");
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MODULE_DESCRIPTION("USB3503 USB HUB driver");
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MODULE_LICENSE("GPL");
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