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339 lines
8.8 KiB
339 lines
8.8 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Provides code common for host and device side USB. |
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* |
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* If either host side (ie. CONFIG_USB=y) or device side USB stack |
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* (ie. CONFIG_USB_GADGET=y) is compiled in the kernel, this module is |
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* compiled-in as well. Otherwise, if either of the two stacks is |
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* compiled as module, this file is compiled as module as well. |
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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/of.h> |
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#include <linux/usb/ch9.h> |
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#include <linux/usb/of.h> |
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#include <linux/usb/otg.h> |
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#include <linux/of_platform.h> |
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#include <linux/debugfs.h> |
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#include "common.h" |
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static const char *const ep_type_names[] = { |
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[USB_ENDPOINT_XFER_CONTROL] = "ctrl", |
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[USB_ENDPOINT_XFER_ISOC] = "isoc", |
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[USB_ENDPOINT_XFER_BULK] = "bulk", |
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[USB_ENDPOINT_XFER_INT] = "intr", |
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}; |
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const char *usb_ep_type_string(int ep_type) |
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{ |
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if (ep_type < 0 || ep_type >= ARRAY_SIZE(ep_type_names)) |
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return "unknown"; |
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return ep_type_names[ep_type]; |
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} |
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EXPORT_SYMBOL_GPL(usb_ep_type_string); |
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const char *usb_otg_state_string(enum usb_otg_state state) |
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{ |
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static const char *const names[] = { |
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[OTG_STATE_A_IDLE] = "a_idle", |
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[OTG_STATE_A_WAIT_VRISE] = "a_wait_vrise", |
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[OTG_STATE_A_WAIT_BCON] = "a_wait_bcon", |
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[OTG_STATE_A_HOST] = "a_host", |
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[OTG_STATE_A_SUSPEND] = "a_suspend", |
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[OTG_STATE_A_PERIPHERAL] = "a_peripheral", |
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[OTG_STATE_A_WAIT_VFALL] = "a_wait_vfall", |
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[OTG_STATE_A_VBUS_ERR] = "a_vbus_err", |
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[OTG_STATE_B_IDLE] = "b_idle", |
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[OTG_STATE_B_SRP_INIT] = "b_srp_init", |
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[OTG_STATE_B_PERIPHERAL] = "b_peripheral", |
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[OTG_STATE_B_WAIT_ACON] = "b_wait_acon", |
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[OTG_STATE_B_HOST] = "b_host", |
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}; |
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if (state < 0 || state >= ARRAY_SIZE(names)) |
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return "UNDEFINED"; |
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return names[state]; |
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} |
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EXPORT_SYMBOL_GPL(usb_otg_state_string); |
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static const char *const speed_names[] = { |
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[USB_SPEED_UNKNOWN] = "UNKNOWN", |
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[USB_SPEED_LOW] = "low-speed", |
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[USB_SPEED_FULL] = "full-speed", |
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[USB_SPEED_HIGH] = "high-speed", |
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[USB_SPEED_WIRELESS] = "wireless", |
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[USB_SPEED_SUPER] = "super-speed", |
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[USB_SPEED_SUPER_PLUS] = "super-speed-plus", |
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}; |
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static const char *const ssp_rate[] = { |
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[USB_SSP_GEN_UNKNOWN] = "UNKNOWN", |
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[USB_SSP_GEN_2x1] = "super-speed-plus-gen2x1", |
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[USB_SSP_GEN_1x2] = "super-speed-plus-gen1x2", |
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[USB_SSP_GEN_2x2] = "super-speed-plus-gen2x2", |
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}; |
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const char *usb_speed_string(enum usb_device_speed speed) |
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{ |
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if (speed < 0 || speed >= ARRAY_SIZE(speed_names)) |
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speed = USB_SPEED_UNKNOWN; |
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return speed_names[speed]; |
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} |
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EXPORT_SYMBOL_GPL(usb_speed_string); |
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enum usb_device_speed usb_get_maximum_speed(struct device *dev) |
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{ |
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const char *maximum_speed; |
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int ret; |
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ret = device_property_read_string(dev, "maximum-speed", &maximum_speed); |
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if (ret < 0) |
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return USB_SPEED_UNKNOWN; |
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ret = match_string(ssp_rate, ARRAY_SIZE(ssp_rate), maximum_speed); |
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if (ret > 0) |
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return USB_SPEED_SUPER_PLUS; |
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ret = match_string(speed_names, ARRAY_SIZE(speed_names), maximum_speed); |
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return (ret < 0) ? USB_SPEED_UNKNOWN : ret; |
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} |
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EXPORT_SYMBOL_GPL(usb_get_maximum_speed); |
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enum usb_ssp_rate usb_get_maximum_ssp_rate(struct device *dev) |
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{ |
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const char *maximum_speed; |
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int ret; |
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ret = device_property_read_string(dev, "maximum-speed", &maximum_speed); |
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if (ret < 0) |
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return USB_SSP_GEN_UNKNOWN; |
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ret = match_string(ssp_rate, ARRAY_SIZE(ssp_rate), maximum_speed); |
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return (ret < 0) ? USB_SSP_GEN_UNKNOWN : ret; |
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} |
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EXPORT_SYMBOL_GPL(usb_get_maximum_ssp_rate); |
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const char *usb_state_string(enum usb_device_state state) |
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{ |
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static const char *const names[] = { |
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[USB_STATE_NOTATTACHED] = "not attached", |
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[USB_STATE_ATTACHED] = "attached", |
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[USB_STATE_POWERED] = "powered", |
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[USB_STATE_RECONNECTING] = "reconnecting", |
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[USB_STATE_UNAUTHENTICATED] = "unauthenticated", |
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[USB_STATE_DEFAULT] = "default", |
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[USB_STATE_ADDRESS] = "addressed", |
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[USB_STATE_CONFIGURED] = "configured", |
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[USB_STATE_SUSPENDED] = "suspended", |
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}; |
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if (state < 0 || state >= ARRAY_SIZE(names)) |
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return "UNKNOWN"; |
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return names[state]; |
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} |
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EXPORT_SYMBOL_GPL(usb_state_string); |
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static const char *const usb_dr_modes[] = { |
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[USB_DR_MODE_UNKNOWN] = "", |
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[USB_DR_MODE_HOST] = "host", |
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[USB_DR_MODE_PERIPHERAL] = "peripheral", |
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[USB_DR_MODE_OTG] = "otg", |
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}; |
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static enum usb_dr_mode usb_get_dr_mode_from_string(const char *str) |
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{ |
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int ret; |
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ret = match_string(usb_dr_modes, ARRAY_SIZE(usb_dr_modes), str); |
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return (ret < 0) ? USB_DR_MODE_UNKNOWN : ret; |
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} |
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enum usb_dr_mode usb_get_dr_mode(struct device *dev) |
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{ |
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const char *dr_mode; |
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int err; |
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err = device_property_read_string(dev, "dr_mode", &dr_mode); |
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if (err < 0) |
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return USB_DR_MODE_UNKNOWN; |
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return usb_get_dr_mode_from_string(dr_mode); |
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} |
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EXPORT_SYMBOL_GPL(usb_get_dr_mode); |
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#ifdef CONFIG_OF |
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/** |
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* of_usb_get_dr_mode_by_phy - Get dual role mode for the controller device |
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* which is associated with the given phy device_node |
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* @np: Pointer to the given phy device_node |
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* @arg0: phandle args[0] for phy's with #phy-cells >= 1, or -1 for |
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* phys which do not have phy-cells |
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* |
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* In dts a usb controller associates with phy devices. The function gets |
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* the string from property 'dr_mode' of the controller associated with the |
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* given phy device node, and returns the correspondig enum usb_dr_mode. |
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*/ |
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enum usb_dr_mode of_usb_get_dr_mode_by_phy(struct device_node *np, int arg0) |
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{ |
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struct device_node *controller = NULL; |
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struct of_phandle_args args; |
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const char *dr_mode; |
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int index; |
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int err; |
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do { |
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controller = of_find_node_with_property(controller, "phys"); |
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if (!of_device_is_available(controller)) |
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continue; |
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index = 0; |
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do { |
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if (arg0 == -1) { |
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args.np = of_parse_phandle(controller, "phys", |
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index); |
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args.args_count = 0; |
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} else { |
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err = of_parse_phandle_with_args(controller, |
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"phys", "#phy-cells", |
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index, &args); |
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if (err) |
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break; |
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} |
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of_node_put(args.np); |
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if (args.np == np && (args.args_count == 0 || |
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args.args[0] == arg0)) |
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goto finish; |
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index++; |
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} while (args.np); |
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} while (controller); |
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finish: |
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err = of_property_read_string(controller, "dr_mode", &dr_mode); |
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of_node_put(controller); |
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if (err < 0) |
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return USB_DR_MODE_UNKNOWN; |
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return usb_get_dr_mode_from_string(dr_mode); |
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} |
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EXPORT_SYMBOL_GPL(of_usb_get_dr_mode_by_phy); |
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/** |
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* of_usb_host_tpl_support - to get if Targeted Peripheral List is supported |
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* for given targeted hosts (non-PC hosts) |
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* @np: Pointer to the given device_node |
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* |
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* The function gets if the targeted hosts support TPL or not |
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*/ |
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bool of_usb_host_tpl_support(struct device_node *np) |
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{ |
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return of_property_read_bool(np, "tpl-support"); |
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} |
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EXPORT_SYMBOL_GPL(of_usb_host_tpl_support); |
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/** |
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* of_usb_update_otg_caps - to update usb otg capabilities according to |
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* the passed properties in DT. |
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* @np: Pointer to the given device_node |
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* @otg_caps: Pointer to the target usb_otg_caps to be set |
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* |
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* The function updates the otg capabilities |
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*/ |
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int of_usb_update_otg_caps(struct device_node *np, |
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struct usb_otg_caps *otg_caps) |
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{ |
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u32 otg_rev; |
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if (!otg_caps) |
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return -EINVAL; |
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if (!of_property_read_u32(np, "otg-rev", &otg_rev)) { |
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switch (otg_rev) { |
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case 0x0100: |
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case 0x0120: |
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case 0x0130: |
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case 0x0200: |
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/* Choose the lesser one if it's already been set */ |
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if (otg_caps->otg_rev) |
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otg_caps->otg_rev = min_t(u16, otg_rev, |
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otg_caps->otg_rev); |
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else |
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otg_caps->otg_rev = otg_rev; |
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break; |
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default: |
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pr_err("%pOF: unsupported otg-rev: 0x%x\n", |
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np, otg_rev); |
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return -EINVAL; |
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} |
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} else { |
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/* |
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* otg-rev is mandatory for otg properties, if not passed |
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* we set it to be 0 and assume it's a legacy otg device. |
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* Non-dt platform can set it afterwards. |
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*/ |
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otg_caps->otg_rev = 0; |
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} |
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if (of_property_read_bool(np, "hnp-disable")) |
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otg_caps->hnp_support = false; |
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if (of_property_read_bool(np, "srp-disable")) |
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otg_caps->srp_support = false; |
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if (of_property_read_bool(np, "adp-disable") || |
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(otg_caps->otg_rev < 0x0200)) |
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otg_caps->adp_support = false; |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(of_usb_update_otg_caps); |
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/** |
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* usb_of_get_companion_dev - Find the companion device |
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* @dev: the device pointer to find a companion |
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* |
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* Find the companion device from platform bus. |
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* |
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* Takes a reference to the returned struct device which needs to be dropped |
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* after use. |
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* |
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* Return: On success, a pointer to the companion device, %NULL on failure. |
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*/ |
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struct device *usb_of_get_companion_dev(struct device *dev) |
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{ |
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struct device_node *node; |
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struct platform_device *pdev = NULL; |
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node = of_parse_phandle(dev->of_node, "companion", 0); |
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if (node) |
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pdev = of_find_device_by_node(node); |
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of_node_put(node); |
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return pdev ? &pdev->dev : NULL; |
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} |
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EXPORT_SYMBOL_GPL(usb_of_get_companion_dev); |
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#endif |
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struct dentry *usb_debug_root; |
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EXPORT_SYMBOL_GPL(usb_debug_root); |
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static int __init usb_common_init(void) |
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{ |
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usb_debug_root = debugfs_create_dir("usb", NULL); |
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ledtrig_usb_init(); |
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return 0; |
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} |
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static void __exit usb_common_exit(void) |
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{ |
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ledtrig_usb_exit(); |
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debugfs_remove_recursive(usb_debug_root); |
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} |
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subsys_initcall(usb_common_init); |
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module_exit(usb_common_exit); |
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MODULE_LICENSE("GPL");
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