diff options
Diffstat (limited to 'drivers/usb/misc/onboard_usb_dev.c')
| -rw-r--r-- | drivers/usb/misc/onboard_usb_dev.c | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/drivers/usb/misc/onboard_usb_dev.c b/drivers/usb/misc/onboard_usb_dev.c index 56710e6b1653..75dfdca04ff1 100644 --- a/drivers/usb/misc/onboard_usb_dev.c +++ b/drivers/usb/misc/onboard_usb_dev.c @@ -11,6 +11,7 @@ #include <linux/err.h> #include <linux/gpio/consumer.h> #include <linux/init.h> +#include <linux/i2c.h> #include <linux/kernel.h> #include <linux/list.h> #include <linux/module.h> @@ -29,6 +30,17 @@ #include "onboard_usb_dev.h" +/* USB5744 register offset and mask */ +#define USB5744_CMD_ATTACH 0xAA +#define USB5744_CMD_ATTACH_LSB 0x56 +#define USB5744_CMD_CREG_ACCESS 0x99 +#define USB5744_CMD_CREG_ACCESS_LSB 0x37 +#define USB5744_CREG_MEM_ADDR 0x00 +#define USB5744_CREG_WRITE 0x00 +#define USB5744_CREG_RUNTIMEFLAGS2 0x41 +#define USB5744_CREG_RUNTIMEFLAGS2_LSB 0x1D +#define USB5744_CREG_BYPASS_UDC_SUSPEND BIT(3) + static void onboard_dev_attach_usb_driver(struct work_struct *work); static struct usb_device_driver onboard_dev_usbdev_driver; @@ -98,6 +110,7 @@ static int onboard_dev_power_on(struct onboard_dev *onboard_dev) fsleep(onboard_dev->pdata->reset_us); gpiod_set_value_cansleep(onboard_dev->reset_gpio, 0); + fsleep(onboard_dev->pdata->power_on_delay_us); onboard_dev->is_powered_on = true; @@ -296,10 +309,50 @@ static void onboard_dev_attach_usb_driver(struct work_struct *work) pr_err("Failed to attach USB driver: %pe\n", ERR_PTR(err)); } +static int onboard_dev_5744_i2c_init(struct i2c_client *client) +{ +#if IS_ENABLED(CONFIG_USB_ONBOARD_DEV_USB5744) + struct device *dev = &client->dev; + int ret; + + /* + * Set BYPASS_UDC_SUSPEND bit to ensure MCU is always enabled + * and ready to respond to SMBus runtime commands. + * The command writes 5 bytes to memory and single data byte in + * configuration register. + */ + char wr_buf[7] = {USB5744_CREG_MEM_ADDR, 5, + USB5744_CREG_WRITE, 1, + USB5744_CREG_RUNTIMEFLAGS2, + USB5744_CREG_RUNTIMEFLAGS2_LSB, + USB5744_CREG_BYPASS_UDC_SUSPEND}; + + ret = i2c_smbus_write_block_data(client, 0, sizeof(wr_buf), wr_buf); + if (ret) + return dev_err_probe(dev, ret, "BYPASS_UDC_SUSPEND bit configuration failed\n"); + + ret = i2c_smbus_write_word_data(client, USB5744_CMD_CREG_ACCESS, + USB5744_CMD_CREG_ACCESS_LSB); + if (ret) + return dev_err_probe(dev, ret, "Configuration Register Access Command failed\n"); + + /* Send SMBus command to boot hub. */ + ret = i2c_smbus_write_word_data(client, USB5744_CMD_ATTACH, + USB5744_CMD_ATTACH_LSB); + if (ret < 0) + return dev_err_probe(dev, ret, "USB Attach with SMBus command failed\n"); + + return ret; +#else + return -ENODEV; +#endif +} + static int onboard_dev_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct onboard_dev *onboard_dev; + struct device_node *i2c_node; int err; onboard_dev = devm_kzalloc(dev, sizeof(*onboard_dev), GFP_KERNEL); @@ -339,6 +392,29 @@ static int onboard_dev_probe(struct platform_device *pdev) if (err) return err; + i2c_node = of_parse_phandle(pdev->dev.of_node, "i2c-bus", 0); + if (i2c_node) { + struct i2c_client *client = NULL; + +#if IS_ENABLED(CONFIG_USB_ONBOARD_DEV_USB5744) + client = of_find_i2c_device_by_node(i2c_node); +#endif + of_node_put(i2c_node); + + if (!client) { + err = -EPROBE_DEFER; + goto err_power_off; + } + + if (of_device_is_compatible(pdev->dev.of_node, "usb424,2744") || + of_device_is_compatible(pdev->dev.of_node, "usb424,5744")) + err = onboard_dev_5744_i2c_init(client); + + put_device(&client->dev); + if (err < 0) + goto err_power_off; + } + /* * The USB driver might have been detached from the USB devices by * onboard_dev_remove() (e.g. through an 'unbind' by userspace), @@ -350,6 +426,10 @@ static int onboard_dev_probe(struct platform_device *pdev) schedule_work(&attach_usb_driver_work); return 0; + +err_power_off: + onboard_dev_power_off(onboard_dev); + return err; } static void onboard_dev_remove(struct platform_device *pdev) |