diff options
Diffstat (limited to 'board/servo_v4p1/ccd_measure_sbu.c')
| -rw-r--r-- | board/servo_v4p1/ccd_measure_sbu.c | 131 |
1 files changed, 0 insertions, 131 deletions
diff --git a/board/servo_v4p1/ccd_measure_sbu.c b/board/servo_v4p1/ccd_measure_sbu.c deleted file mode 100644 index b9c9680cc9..0000000000 --- a/board/servo_v4p1/ccd_measure_sbu.c +++ /dev/null @@ -1,131 +0,0 @@ -/* Copyright 2020 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. - */ -/* CCD Measure SBU */ - -#include "adc.h" -#include "console.h" -#include "gpio.h" -#include "hooks.h" -#include "ioexpanders.h" -#include "timer.h" - -#define CPRINTS(format, args...) cprints(CC_SYSTEM, format, ## args) -#define CPRINTF(format, args...) cprintf(CC_SYSTEM, format, ## args) - -/* - * Define voltage thresholds for SBU USB detection. - * - * Max observed USB low across sampled systems: 666mV - * Min observed USB high across sampled systems: 3026mV - */ -#define GND_MAX_MV 700 -#define USB_HIGH_MV 2500 -#define SBU_DIRECT 0 -#define SBU_FLIP 1 - -#define MODE_SBU_DISCONNECT 0 -#define MODE_SBU_CONNECT 1 -#define MODE_SBU_FLIP 2 -#define MODE_SBU_OTHER 3 - -static void ccd_measure_sbu(void); -DECLARE_DEFERRED(ccd_measure_sbu); -static void ccd_measure_sbu(void) -{ - int sbu1; - int sbu2; - int mux_en; - static int count /* = 0 */; - static int last /* = 0 */; - static int polarity /* = 0 */; - - /* Read sbu voltage levels */ - sbu1 = adc_read_channel(ADC_SBU1_DET); - sbu2 = adc_read_channel(ADC_SBU2_DET); - mux_en = gpio_get_level(GPIO_SBU_MUX_EN); - - /* - * While SBU_MUX is disabled (SuzyQ unplugged), we'll poll the SBU lines - * to check if an idling, unconfigured USB device is present. - * USB FS pulls one line high for connect request. - * If so, and it persists for 500ms, we'll enable the SuzyQ in that - * orientation. - */ - if ((!mux_en) && (sbu1 > USB_HIGH_MV) && (sbu2 < GND_MAX_MV)) { - /* Check flip connection polarity. */ - if (last != MODE_SBU_FLIP) { - last = MODE_SBU_FLIP; - polarity = SBU_FLIP; - count = 0; - } else { - count++; - } - } else if ((!mux_en) && (sbu2 > USB_HIGH_MV) && (sbu1 < GND_MAX_MV)) { - /* Check direct connection polarity. */ - if (last != MODE_SBU_CONNECT) { - last = MODE_SBU_CONNECT; - polarity = SBU_DIRECT; - count = 0; - } else { - count++; - } - /* - * If SuzyQ is enabled, we'll poll for a persistent no-signal - * for 500ms. Since USB is differential, we should never see - * GND/GND while the device is connected. - * If disconnected, electrically remove SuzyQ. - */ - } else if ((mux_en) && (sbu1 < GND_MAX_MV) && (sbu2 < GND_MAX_MV)) { - /* Check for SBU disconnect if connected. */ - if (last != MODE_SBU_DISCONNECT) { - last = MODE_SBU_DISCONNECT; - count = 0; - } else { - count++; - } - } else { - /* Didn't find anything, reset state. */ - last = MODE_SBU_OTHER; - count = 0; - } - - /* - * We have seen a new state continuously for 500ms. - * Let's update the mux to enable/disable SuzyQ appropriately. - */ - if (count > 5) { - if (mux_en) { - /* Disable mux as it's disconnected now. */ - gpio_set_level(GPIO_SBU_MUX_EN, 0); - msleep(10); - CPRINTS("CCD: disconnected."); - } else { - /* SBU flip = polarity */ - sbu_flip_sel(polarity); - gpio_set_level(GPIO_SBU_MUX_EN, 1); - msleep(10); - CPRINTS("CCD: connected %s", - polarity ? "flip" : "noflip"); - } - } - - /* Measure every 100ms, forever. */ - hook_call_deferred(&ccd_measure_sbu_data, 100 * MSEC); -} - -void ccd_enable(int enable) -{ - if (enable) { - hook_call_deferred(&ccd_measure_sbu_data, 0); - } else { - gpio_set_level(GPIO_SBU_MUX_EN, 0); - hook_call_deferred(&ccd_measure_sbu_data, -1); - } -} - -void start_ccd_meas_sbu_cycle(void) -{ - hook_call_deferred(&ccd_measure_sbu_data, 1000 * MSEC); -} |