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path: root/drivers/usb/phy/phy-isp1301.c
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-rw-r--r--drivers/usb/phy/phy-isp1301.c162
1 files changed, 162 insertions, 0 deletions
diff --git a/drivers/usb/phy/phy-isp1301.c b/drivers/usb/phy/phy-isp1301.c
new file mode 100644
index 00000000000..225ae6c97ee
--- /dev/null
+++ b/drivers/usb/phy/phy-isp1301.c
@@ -0,0 +1,162 @@
+/*
+ * NXP ISP1301 USB transceiver driver
+ *
+ * Copyright (C) 2012 Roland Stigge
+ *
+ * Author: Roland Stigge <stigge@antcom.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/i2c.h>
+#include <linux/usb/phy.h>
+#include <linux/usb/isp1301.h>
+
+#define DRV_NAME "isp1301"
+
+struct isp1301 {
+ struct usb_phy phy;
+ struct mutex mutex;
+
+ struct i2c_client *client;
+};
+
+#define phy_to_isp(p) (container_of((p), struct isp1301, phy))
+
+static const struct i2c_device_id isp1301_id[] = {
+ { "isp1301", 0 },
+ { }
+};
+
+static struct i2c_client *isp1301_i2c_client;
+
+static int __isp1301_write(struct isp1301 *isp, u8 reg, u8 value, u8 clear)
+{
+ return i2c_smbus_write_byte_data(isp->client, reg | clear, value);
+}
+
+static int isp1301_write(struct isp1301 *isp, u8 reg, u8 value)
+{
+ return __isp1301_write(isp, reg, value, 0);
+}
+
+static int isp1301_clear(struct isp1301 *isp, u8 reg, u8 value)
+{
+ return __isp1301_write(isp, reg, value, ISP1301_I2C_REG_CLEAR_ADDR);
+}
+
+static int isp1301_phy_init(struct usb_phy *phy)
+{
+ struct isp1301 *isp = phy_to_isp(phy);
+
+ /* Disable transparent UART mode first */
+ isp1301_clear(isp, ISP1301_I2C_MODE_CONTROL_1, MC1_UART_EN);
+ isp1301_clear(isp, ISP1301_I2C_MODE_CONTROL_1, ~MC1_SPEED_REG);
+ isp1301_write(isp, ISP1301_I2C_MODE_CONTROL_1, MC1_SPEED_REG);
+ isp1301_clear(isp, ISP1301_I2C_MODE_CONTROL_2, ~0);
+ isp1301_write(isp, ISP1301_I2C_MODE_CONTROL_2, (MC2_BI_DI | MC2_PSW_EN
+ | MC2_SPD_SUSP_CTRL));
+
+ isp1301_clear(isp, ISP1301_I2C_OTG_CONTROL_1, ~0);
+ isp1301_write(isp, ISP1301_I2C_MODE_CONTROL_1, MC1_DAT_SE0);
+ isp1301_write(isp, ISP1301_I2C_OTG_CONTROL_1, (OTG1_DM_PULLDOWN
+ | OTG1_DP_PULLDOWN));
+ isp1301_clear(isp, ISP1301_I2C_OTG_CONTROL_1, (OTG1_DM_PULLUP
+ | OTG1_DP_PULLUP));
+
+ /* mask all interrupts */
+ isp1301_clear(isp, ISP1301_I2C_INTERRUPT_LATCH, ~0);
+ isp1301_clear(isp, ISP1301_I2C_INTERRUPT_FALLING, ~0);
+ isp1301_clear(isp, ISP1301_I2C_INTERRUPT_RISING, ~0);
+
+ return 0;
+}
+
+static int isp1301_phy_set_vbus(struct usb_phy *phy, int on)
+{
+ struct isp1301 *isp = phy_to_isp(phy);
+
+ if (on)
+ isp1301_write(isp, ISP1301_I2C_OTG_CONTROL_1, OTG1_VBUS_DRV);
+ else
+ isp1301_clear(isp, ISP1301_I2C_OTG_CONTROL_1, OTG1_VBUS_DRV);
+
+ return 0;
+}
+
+static int isp1301_probe(struct i2c_client *client,
+ const struct i2c_device_id *i2c_id)
+{
+ struct isp1301 *isp;
+ struct usb_phy *phy;
+
+ isp = devm_kzalloc(&client->dev, sizeof(*isp), GFP_KERNEL);
+ if (!isp)
+ return -ENOMEM;
+
+ isp->client = client;
+ mutex_init(&isp->mutex);
+
+ phy = &isp->phy;
+ phy->label = DRV_NAME;
+ phy->init = isp1301_phy_init;
+ phy->set_vbus = isp1301_phy_set_vbus;
+ phy->type = USB_PHY_TYPE_USB2;
+
+ i2c_set_clientdata(client, isp);
+ usb_add_phy_dev(phy);
+
+ isp1301_i2c_client = client;
+
+ return 0;
+}
+
+static int isp1301_remove(struct i2c_client *client)
+{
+ struct isp1301 *isp = i2c_get_clientdata(client);
+
+ usb_remove_phy(&isp->phy);
+ isp1301_i2c_client = NULL;
+
+ return 0;
+}
+
+static struct i2c_driver isp1301_driver = {
+ .driver = {
+ .name = DRV_NAME,
+ },
+ .probe = isp1301_probe,
+ .remove = isp1301_remove,
+ .id_table = isp1301_id,
+};
+
+module_i2c_driver(isp1301_driver);
+
+static int match(struct device *dev, void *data)
+{
+ struct device_node *node = (struct device_node *)data;
+ return (dev->of_node == node) &&
+ (dev->driver == &isp1301_driver.driver);
+}
+
+struct i2c_client *isp1301_get_client(struct device_node *node)
+{
+ if (node) { /* reference of ISP1301 I2C node via DT */
+ struct device *dev = bus_find_device(&i2c_bus_type, NULL,
+ node, match);
+ if (!dev)
+ return NULL;
+ return to_i2c_client(dev);
+ } else { /* non-DT: only one ISP1301 chip supported */
+ return isp1301_i2c_client;
+ }
+}
+EXPORT_SYMBOL_GPL(isp1301_get_client);
+
+MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
+MODULE_DESCRIPTION("NXP ISP1301 USB transceiver driver");
+MODULE_LICENSE("GPL");