1 files changed, 325 insertions, 0 deletions

diff --git a/drivers/usb/misc/usb3503.c b/drivers/usb/misc/usb3503.c
new file mode 100644
index 000000000000..f713f6aeb6e5
--- /dev/null
+++ b/drivers/usb/misc/usb3503.c
@@ -0,0 +1,325 @@
+/*
+ * Driver for SMSC USB3503 USB 2.0 hub controller driver
+ *
+ * Copyright (c) 2012-2013 Dongjin Kim (tobetter@gmail.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <linux/i2c.h>
+#include <linux/gpio.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/of_gpio.h>
+#include <linux/platform_device.h>
+#include <linux/platform_data/usb3503.h>
+
+#define USB3503_VIDL            0x00
+#define USB3503_VIDM            0x01
+#define USB3503_PIDL            0x02
+#define USB3503_PIDM            0x03
+#define USB3503_DIDL            0x04
+#define USB3503_DIDM            0x05
+
+#define USB3503_CFG1            0x06
+#define USB3503_SELF_BUS_PWR    (1 << 7)
+
+#define USB3503_CFG2            0x07
+#define USB3503_CFG3            0x08
+#define USB3503_NRD             0x09
+
+#define USB3503_PDS             0x0a
+#define USB3503_PORT1           (1 << 1)
+#define USB3503_PORT2           (1 << 2)
+#define USB3503_PORT3           (1 << 3)
+
+#define USB3503_SP_ILOCK        0xe7
+#define USB3503_SPILOCK_CONNECT (1 << 1)
+#define USB3503_SPILOCK_CONFIG  (1 << 0)
+
+#define USB3503_CFGP            0xee
+#define USB3503_CLKSUSP         (1 << 7)
+
+struct usb3503 {
+        enum usb3503_mode       mode;
+        struct i2c_client       *client;
+        int     gpio_intn;
+        int     gpio_reset;
+        int     gpio_connect;
+};
+
+static int usb3503_write_register(struct i2c_client *client,
+                char reg, char data)
+{
+        return i2c_smbus_write_byte_data(client, reg, data);
+}
+
+static int usb3503_read_register(struct i2c_client *client, char reg)
+{
+        return i2c_smbus_read_byte_data(client, reg);
+}
+
+static int usb3503_set_bits(struct i2c_client *client, char reg, char req)
+{
+        int err;
+
+        err = usb3503_read_register(client, reg);
+        if (err < 0)
+                return err;
+
+        err = usb3503_write_register(client, reg, err | req);
+        if (err < 0)
+                return err;
+
+        return 0;
+}
+
+static int usb3503_clear_bits(struct i2c_client *client, char reg, char req)
+{
+        int err;
+
+        err = usb3503_read_register(client, reg);
+        if (err < 0)
+                return err;
+
+        err = usb3503_write_register(client, reg, err & ~req);
+        if (err < 0)
+                return err;
+
+        return 0;
+}
+
+static int usb3503_reset(int gpio_reset, int state)
+{
+        if (gpio_is_valid(gpio_reset))
+                gpio_set_value(gpio_reset, state);
+
+        /* Wait RefClk when RESET_N is released, otherwise Hub will
+         * not transition to Hub Communication Stage.
+         */
+        if (state)
+                msleep(100);
+
+        return 0;
+}
+
+static int usb3503_switch_mode(struct usb3503 *hub, enum usb3503_mode mode)
+{
+        struct i2c_client *i2c = hub->client;
+        int err = 0;
+
+        switch (mode) {
+        case USB3503_MODE_HUB:
+                usb3503_reset(hub->gpio_reset, 1);
+
+                /* SP_ILOCK: set connect_n, config_n for config */
+                err = usb3503_write_register(i2c, USB3503_SP_ILOCK,
+                                (USB3503_SPILOCK_CONNECT
+                                 | USB3503_SPILOCK_CONFIG));
+                if (err < 0) {
+                        dev_err(&i2c->dev, "SP_ILOCK failed (%d)\n", err);
+                        goto err_hubmode;
+                }
+
+                /* PDS : Port2,3 Disable For Self Powered Operation */
+                err = usb3503_set_bits(i2c, USB3503_PDS,
+                                (USB3503_PORT2 | USB3503_PORT3));
+                if (err < 0) {
+                        dev_err(&i2c->dev, "PDS failed (%d)\n", err);
+                        goto err_hubmode;
+                }
+
+                /* CFG1 : SELF_BUS_PWR -> Self-Powerd operation */
+                err = usb3503_set_bits(i2c, USB3503_CFG1, USB3503_SELF_BUS_PWR);
+                if (err < 0) {
+                        dev_err(&i2c->dev, "CFG1 failed (%d)\n", err);
+                        goto err_hubmode;
+                }
+
+                /* SP_LOCK: clear connect_n, config_n for hub connect */
+                err = usb3503_clear_bits(i2c, USB3503_SP_ILOCK,
+                                (USB3503_SPILOCK_CONNECT
+                                 | USB3503_SPILOCK_CONFIG));
+                if (err < 0) {
+                        dev_err(&i2c->dev, "SP_ILOCK failed (%d)\n", err);
+                        goto err_hubmode;
+                }
+
+                hub->mode = mode;
+                dev_info(&i2c->dev, "switched to HUB mode\n");
+                break;
+
+        case USB3503_MODE_STANDBY:
+                usb3503_reset(hub->gpio_reset, 0);
+
+                hub->mode = mode;
+                dev_info(&i2c->dev, "switched to STANDBY mode\n");
+                break;
+
+        default:
+                dev_err(&i2c->dev, "unknown mode is request\n");
+                err = -EINVAL;
+                break;
+        }
+
+err_hubmode:
+        return err;
+}
+
+static int usb3503_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
+{
+        struct usb3503_platform_data *pdata = i2c->dev.platform_data;
+        struct device_node *np = i2c->dev.of_node;
+        struct usb3503 *hub;
+        int err = -ENOMEM;
+        u32 mode = USB3503_MODE_UNKNOWN;
+
+        hub = kzalloc(sizeof(struct usb3503), GFP_KERNEL);
+        if (!hub) {
+                dev_err(&i2c->dev, "private data alloc fail\n");
+                return err;
+        }
+
+        i2c_set_clientdata(i2c, hub);
+        hub->client = i2c;
+
+        if (pdata) {
+                hub->gpio_intn          = pdata->gpio_intn;
+                hub->gpio_connect       = pdata->gpio_connect;
+                hub->gpio_reset         = pdata->gpio_reset;
+                hub->mode               = pdata->initial_mode;
+        } else if (np) {
+                hub->gpio_intn  = of_get_named_gpio(np, "connect-gpios", 0);
+                if (hub->gpio_intn == -EPROBE_DEFER)
+                        return -EPROBE_DEFER;
+                hub->gpio_connect = of_get_named_gpio(np, "intn-gpios", 0);
+                if (hub->gpio_connect == -EPROBE_DEFER)
+                        return -EPROBE_DEFER;
+                hub->gpio_reset = of_get_named_gpio(np, "reset-gpios", 0);
+                if (hub->gpio_reset == -EPROBE_DEFER)
+                        return -EPROBE_DEFER;
+                of_property_read_u32(np, "initial-mode", &mode);
+                hub->mode = mode;
+        }
+
+        if (gpio_is_valid(hub->gpio_intn)) {
+                err = gpio_request_one(hub->gpio_intn,
+                                GPIOF_OUT_INIT_HIGH, "usb3503 intn");
+                if (err) {
+                        dev_err(&i2c->dev,
+                                        "unable to request GPIO %d as connect pin (%d)\n",
+                                        hub->gpio_intn, err);
+                        goto err_out;
+                }
+        }
+
+        if (gpio_is_valid(hub->gpio_connect)) {
+                err = gpio_request_one(hub->gpio_connect,
+                                GPIOF_OUT_INIT_HIGH, "usb3503 connect");
+                if (err) {
+                        dev_err(&i2c->dev,
+                                        "unable to request GPIO %d as connect pin (%d)\n",
+                                        hub->gpio_connect, err);
+                        goto err_gpio_connect;
+                }
+        }
+
+        if (gpio_is_valid(hub->gpio_reset)) {
+                err = gpio_request_one(hub->gpio_reset,
+                                GPIOF_OUT_INIT_LOW, "usb3503 reset");
+                if (err) {
+                        dev_err(&i2c->dev,
+                                        "unable to request GPIO %d as reset pin (%d)\n",
+                                        hub->gpio_reset, err);
+                        goto err_gpio_reset;
+                }
+        }
+
+        usb3503_switch_mode(hub, hub->mode);
+
+        dev_info(&i2c->dev, "%s: probed on  %s mode\n", __func__,
+                        (hub->mode == USB3503_MODE_HUB) ? "hub" : "standby");
+
+        return 0;
+
+err_gpio_reset:
+        if (gpio_is_valid(hub->gpio_connect))
+                gpio_free(hub->gpio_connect);
+err_gpio_connect:
+        if (gpio_is_valid(hub->gpio_intn))
+                gpio_free(hub->gpio_intn);
+err_out:
+        kfree(hub);
+
+        return err;
+}
+
+static int usb3503_remove(struct i2c_client *i2c)
+{
+        struct usb3503 *hub = i2c_get_clientdata(i2c);
+
+        if (gpio_is_valid(hub->gpio_intn))
+                gpio_free(hub->gpio_intn);
+        if (gpio_is_valid(hub->gpio_connect))
+                gpio_free(hub->gpio_connect);
+        if (gpio_is_valid(hub->gpio_reset))
+                gpio_free(hub->gpio_reset);
+
+        kfree(hub);
+
+        return 0;
+}
+
+static const struct i2c_device_id usb3503_id[] = {
+        { USB3503_I2C_NAME, 0 },
+        { }
+};
+MODULE_DEVICE_TABLE(i2c, usb3503_id);
+
+#ifdef CONFIG_OF
+static const struct of_device_id usb3503_of_match[] = {
+        { .compatible = "smsc,usb3503", },
+        {},
+};
+MODULE_DEVICE_TABLE(of, usb3503_of_match);
+#endif
+
+static struct i2c_driver usb3503_driver = {
+        .driver = {
+                .name = USB3503_I2C_NAME,
+                .of_match_table = of_match_ptr(usb3503_of_match),
+        },
+        .probe          = usb3503_probe,
+        .remove         = usb3503_remove,
+        .id_table       = usb3503_id,
+};
+
+static int __init usb3503_init(void)
+{
+        return i2c_add_driver(&usb3503_driver);
+}
+
+static void __exit usb3503_exit(void)
+{
+        i2c_del_driver(&usb3503_driver);
+}
+
+module_init(usb3503_init);
+module_exit(usb3503_exit);
+
+MODULE_AUTHOR("Dongjin Kim <tobetter@gmail.com>");
+MODULE_DESCRIPTION("USB3503 USB HUB driver");
+MODULE_LICENSE("GPL");