text: /* Copyright 2015 The Chromium OS Authors. All rights reserved.
   * Use of this source code is governed by a BSD-style license that can be
   * found in the LICENSE file.
   */
  
  #include "common.h"
  #include "console.h"
  #include "gpio.h"
  #include "hooks.h"
  #include "registers.h"
  #include "system.h"
  #include "task.h"
  #include "timer.h"
  #include "util.h"
  #include "usb_pd.h"
  
  #define CPRINTF(format, args...) cprintf(CC_USBPD, format, ## args)
  #define CPRINTS(format, args...) cprints(CC_USBPD, format, ## args)
  
  #define PDO_FIXED_FLAGS (PDO_FIXED_DUAL_ROLE | PDO_FIXED_DATA_SWAP)
  
  /* Used to fake VBUS presence since no GPIO is available to read VBUS */
  static int vbus_present;
  
  const uint32_t pd_src_pdo[] = {
  		PDO_FIXED(5000, 1500, PDO_FIXED_FLAGS),
  };
  const int pd_src_pdo_cnt = ARRAY_SIZE(pd_src_pdo);
  
  const uint32_t pd_snk_pdo[] = {
  		PDO_FIXED(5000, 500, PDO_FIXED_FLAGS),
  		PDO_BATT(5000, 20000, 15000),
  		PDO_VAR(5000, 20000, 3000),
  };
  const int pd_snk_pdo_cnt = ARRAY_SIZE(pd_snk_pdo);
  
  int pd_is_valid_input_voltage(int mv)
  {
  	return 1;
  }
  
  int pd_check_requested_voltage(uint32_t rdo)
  {
  	int max_ma = rdo & 0x3FF;
  	int op_ma = (rdo >> 10) & 0x3FF;
  	int idx = rdo >> 28;
  	uint32_t pdo;
  	uint32_t pdo_ma;
  
  	if (!idx || idx > pd_src_pdo_cnt)
  		return EC_ERROR_INVAL; /* Invalid index */
  
  	/* check current ... */
  	pdo = pd_src_pdo[idx - 1];
  	pdo_ma = (pdo & 0x3ff);
  	if (op_ma > pdo_ma)
  		return EC_ERROR_INVAL; /* too much op current */
  	if (max_ma > pdo_ma)
  		return EC_ERROR_INVAL; /* too much max current */
  
  	CPRINTF("Requested %d V %d mA (for %d/%d mA)\n",
  		 ((pdo >> 10) & 0x3ff) * 50, (pdo & 0x3ff) * 10,
  		 ((rdo >> 10) & 0x3ff) * 10, (rdo & 0x3ff) * 10);
  
  	return EC_SUCCESS;
  }
  
  void pd_transition_voltage(int idx)
  {
  	/* No-operation: we are always 5V */
  }
  
  int pd_set_power_supply_ready(int port)
  {
  	/* Turn on the "up" LED when we output VBUS */
  	gpio_set_level(GPIO_LED_U, 1);
  	CPRINTS("Power supply ready/%d", port);
  	return EC_SUCCESS; /* we are ready */
  }
  
  void pd_power_supply_reset(int port)
  {
  	/* Turn off the "up" LED when we shutdown VBUS */
  	gpio_set_level(GPIO_LED_U, 0);
  	/* Disable VBUS */
  	CPRINTS("Disable VBUS", port);
  }
  
  void pd_set_input_current_limit(int port, uint32_t max_ma,
  				uint32_t supply_voltage)
  {
  	CPRINTS("USBPD current limit port %d max %d mA %d mV",
  		port, max_ma, supply_voltage);
  	/* do some LED coding of the power we can sink */
  	if (max_ma) {
  		if (supply_voltage > 6500)
  			gpio_set_level(GPIO_LED_R, 1);
  		else
  			gpio_set_level(GPIO_LED_L, 1);
  	} else {
  		gpio_set_level(GPIO_LED_L, 0);
  		gpio_set_level(GPIO_LED_R, 0);
  	}
  }
  
  void typec_set_input_current_limit(int port, uint32_t max_ma,
  				   uint32_t supply_voltage)
  {
  	CPRINTS("TYPEC current limit port %d max %d mA %d mV",
  		port, max_ma, supply_voltage);
  	gpio_set_level(GPIO_LED_R, !!max_ma);
  }
  
  void button_event(enum gpio_signal signal)
  {
  	vbus_present = !vbus_present;
  	CPRINTS("VBUS %d", vbus_present);
  }
  
  static int command_vbus_toggle(int argc, char **argv)
  {
  	vbus_present = !vbus_present;
  	CPRINTS("VBUS %d", vbus_present);
  
  	return EC_SUCCESS;
  }
  DECLARE_CONSOLE_COMMAND(vbus, command_vbus_toggle,
  			"",
  			"Toggle VBUS detected",
  			NULL);
  
  int pd_snk_is_vbus_provided(int port)
  {
  	return vbus_present;
  }
  
  int pd_board_checks(void)
  {
  	return EC_SUCCESS;
  }
  
  int pd_check_power_swap(int port)
  {
  	/*
  	 * Allow power swap as long as we are acting as a dual role device,
  	 * otherwise assume our role is fixed (not in S0 or console command
  	 * to fix our role).
  	 */
  	return pd_get_dual_role() == PD_DRP_TOGGLE_ON ? 1 : 0;
  }
  
  int pd_check_data_swap(int port, int data_role)
  {
  	/* Always allow data swap */
  	return 1;
  }
  
  void pd_execute_data_swap(int port, int data_role)
  {
  }
  
  void pd_check_pr_role(int port, int pr_role, int flags)
  {
  }
  
  void pd_check_dr_role(int port, int dr_role, int flags)
  {
  }
  /* ----------------- Vendor Defined Messages ------------------ */
  const struct svdm_response svdm_rsp = {
  	.identity = NULL,
  	.svids = NULL,
  	.modes = NULL,
  };
  
  int pd_custom_vdm(int port, int cnt, uint32_t *payload,
  		  uint32_t **rpayload)
  {
  	int cmd = PD_VDO_CMD(payload[0]);
  	uint16_t dev_id = 0;
  	int is_rw;
  
  	/* make sure we have some payload */
  	if (cnt == 0)
  		return 0;
  
  	switch (cmd) {
  	case VDO_CMD_VERSION:
  		/* guarantee last byte of payload is null character */
  		*(payload + cnt - 1) = 0;
  		CPRINTF("version: %s\n", (char *)(payload+1));
  		break;
  	case VDO_CMD_READ_INFO:
  	case VDO_CMD_SEND_INFO:
  		/* copy hash */
  		if (cnt == 7) {
  			dev_id = VDO_INFO_HW_DEV_ID(payload[6]);
  			is_rw = VDO_INFO_IS_RW(payload[6]);
  
  			CPRINTF("DevId:%d.%d SW:%d RW:%d\n",
  				HW_DEV_ID_MAJ(dev_id),
  				HW_DEV_ID_MIN(dev_id),
  				VDO_INFO_SW_DBG_VER(payload[6]),
  				is_rw);
  		} else if (cnt == 6) {
  			/* really old devices don't have last byte */
  			pd_dev_store_rw_hash(port, dev_id, payload + 1,
  					     SYSTEM_IMAGE_UNKNOWN);
  		}
  		break;
  	}
  
  	return 0;
  }
  
  #ifdef CONFIG_USB_PD_ALT_MODE_DFP
  static int dp_flags[CONFIG_USB_PD_PORT_COUNT];
  
  static void svdm_safe_dp_mode(int port)
  {
  	/* make DP interface safe until configure */
  	dp_flags[port] = 0;
  	/* board_set_usb_mux(port, TYPEC_MUX_NONE, pd_get_polarity(port)); */
  }
  
  static int svdm_enter_dp_mode(int port, uint32_t mode_caps)
  {
  	/* Only enter mode if device is DFP_D capable */
  	if (mode_caps & MODE_DP_SNK) {
  		svdm_safe_dp_mode(port);
  		return 0;
  	}
  
  	return -1;
  }
  
  static int svdm_dp_status(int port, uint32_t *payload)
  {
  	int opos = pd_alt_mode(port, USB_SID_DISPLAYPORT);
  	payload[0] = VDO(USB_SID_DISPLAYPORT, 1,
  			 CMD_DP_STATUS | VDO_OPOS(opos));
  	payload[1] = VDO_DP_STATUS(0, /* HPD IRQ  ... not applicable */
  				   0, /* HPD level ... not applicable */
  				   0, /* exit DP? ... no */
  				   0, /* usb mode? ... no */
  				   0, /* multi-function ... no */
  				   (!!(dp_flags[port] & DP_FLAGS_DP_ON)),
  				   0, /* power low? ... no */
  				   (!!(dp_flags[port] & DP_FLAGS_DP_ON)));
  	return 2;
  };
  
  static int svdm_dp_config(int port, uint32_t *payload)
  {
  	int opos = pd_alt_mode(port, USB_SID_DISPLAYPORT);
  	/* board_set_usb_mux(port, TYPEC_MUX_DP, pd_get_polarity(port)); */
  	payload[0] = VDO(USB_SID_DISPLAYPORT, 1,
  			 CMD_DP_CONFIG | VDO_OPOS(opos));
  	payload[1] = VDO_DP_CFG(MODE_DP_PIN_E, /* pin mode */
  				1,             /* DPv1.3 signaling */
  				2);            /* UFP connected */
  	return 2;
  };
  
  static void svdm_dp_post_config(int port)
  {
  	dp_flags[port] |= DP_FLAGS_DP_ON;
  	if (!(dp_flags[port] & DP_FLAGS_HPD_HI_PENDING))
  		return;
  }
  
  static int svdm_dp_attention(int port, uint32_t *payload)
  {
  	/* ack */
  	return 1;
  }
  
  static void svdm_exit_dp_mode(int port)
  {
  	svdm_safe_dp_mode(port);
  	/* gpio_set_level(PORT_TO_HPD(port), 0); */
  }
  
  static int svdm_enter_gfu_mode(int port, uint32_t mode_caps)
  {
  	/* Always enter GFU mode */
  	return 0;
  }
  
  static void svdm_exit_gfu_mode(int port)
  {
  }
  
  static int svdm_gfu_status(int port, uint32_t *payload)
  {
  	/*
  	 * This is called after enter mode is successful, send unstructured
  	 * VDM to read info.
  	 */
  	pd_send_vdm(port, USB_VID_GOOGLE, VDO_CMD_READ_INFO, NULL, 0);
  	return 0;
  }
  
  static int svdm_gfu_config(int port, uint32_t *payload)
  {
  	return 0;
  }
  
  static int svdm_gfu_attention(int port, uint32_t *payload)
  {
  	return 0;
  }
  
  const struct svdm_amode_fx supported_modes[] = {
  	{
  		.svid = USB_SID_DISPLAYPORT,
  		.enter = &svdm_enter_dp_mode,
  		.status = &svdm_dp_status,
  		.config = &svdm_dp_config,
  		.post_config = &svdm_dp_post_config,
  		.attention = &svdm_dp_attention,
  		.exit = &svdm_exit_dp_mode,
  	},
  	{
  		.svid = USB_VID_GOOGLE,
  		.enter = &svdm_enter_gfu_mode,
  		.status = &svdm_gfu_status,
  		.config = &svdm_gfu_config,
  		.attention = &svdm_gfu_attention,
  		.exit = &svdm_exit_gfu_mode,
  	}
  };
  const int supported_modes_cnt = ARRAY_SIZE(supported_modes);
  #endif /* CONFIG_USB_PD_ALT_MODE_DFP */
  