diff options
Diffstat (limited to 'driver/ioexpander/it8801.c')
| -rw-r--r-- | driver/ioexpander/it8801.c | 227 |
1 files changed, 0 insertions, 227 deletions
diff --git a/driver/ioexpander/it8801.c b/driver/ioexpander/it8801.c deleted file mode 100644 index 6b1184c740..0000000000 --- a/driver/ioexpander/it8801.c +++ /dev/null @@ -1,227 +0,0 @@ -/* Copyright 2019 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 "i2c.h" -#include "it8801.h" -#include "keyboard_raw.h" -#include "keyboard_scan.h" -#include "registers.h" -#include "task.h" - -#define CPRINTS(format, args...) cprints(CC_KEYSCAN, format, ## args) - -static int it8801_read(int reg, int *data) -{ - return i2c_read8(I2C_PORT_IO_EXPANDER_IT8801, IT8801_I2C_ADDR, - reg, data); -} - -static int it8801_write(int reg, int data) -{ - return i2c_write8(I2C_PORT_IO_EXPANDER_IT8801, IT8801_I2C_ADDR, - reg, data); -} - -struct it8801_vendor_id_t { - uint8_t chip_id; - uint8_t reg; -}; - -static const struct it8801_vendor_id_t it8801_vendor_id_verify[] = { - { 0x12, IT8801_REG_HBVIDR}, - { 0x83, IT8801_REG_LBVIDR}, -}; - -static int it8801_check_vendor_id(void) -{ - int i, ret, val; - - /* Verify vendor ID registers(16-bits). */ - for (i = 0; i < ARRAY_SIZE(it8801_vendor_id_verify); i++) { - ret = it8801_read(it8801_vendor_id_verify[i].reg, &val); - - if (ret != EC_SUCCESS) - return ret; - - if (val != it8801_vendor_id_verify[i].chip_id) - return EC_ERROR_UNKNOWN; - } - - return EC_SUCCESS; -} - -void keyboard_raw_init(void) -{ - int ret, val; - - /* Verify Vendor ID registers. */ - ret = it8801_check_vendor_id(); - if (ret) { - CPRINTS("Failed to read IT8801 vendor id %x", ret); - return; - } - - /* KSO alternate function switching(KSO[21:20, 18]). */ - it8801_write(IT8801_REG_GPIO01_KSO18, IT8801_REG_MASK_GPIOAFS_FUNC2); - it8801_write(IT8801_REG_GPIO22_KSO21, IT8801_REG_MASK_GPIOAFS_FUNC2); - it8801_write(IT8801_REG_GPIO23_KSO20, IT8801_REG_MASK_GPIOAFS_FUNC2); - - /* Start with KEYBOARD_COLUMN_ALL, KSO[22:11, 6:0] output low. */ - it8801_write(IT8801_REG_KSOMCR, IT8801_REG_MASK_AKSOSC); - - if (IS_ENABLED(CONFIG_KEYBOARD_COL2_INVERTED)) { - /* - * Since most of the KSO pins can't drive up, we'll must use - * a pin capable of being a GPIO instead and use the GPIO - * feature to do the required inverted push pull. - */ - it8801_write(IT8801_REG_GPIO23_KSO20, IT8801_REG_MASK_GPIODIR); - - /* Start with KEYBOARD_COLUMN_ALL, output high(so selected). */ - it8801_read(IT8801_REG_GPIOG2SOVR, &val); - it8801_write(IT8801_REG_GPIOG2SOVR, val | IT8801_REG_GPIO23SOV); - } - - /* Keyboard scan in interrupt enable register */ - it8801_write(IT8801_REG_KSIIER, 0xff); - /* Gather KSI interrupt enable */ - it8801_write(IT8801_REG_GIECR, IT8801_REG_MASK_GKSIIE); - /* Alert response enable */ - it8801_write(IT8801_REG_SMBCR, IT8801_REG_MASK_ARE); - - keyboard_raw_enable_interrupt(0); -} - -void keyboard_raw_task_start(void) -{ - keyboard_raw_enable_interrupt(1); -} - -static const uint8_t kso_mapping[] = { - 0, 1, 20, 3, 4, 5, 6, 17, 18, 16, 15, 11, 12, -#ifdef CONFIG_KEYBOARD_KEYPAD - 13, 14 -#endif -}; -BUILD_ASSERT(ARRAY_SIZE(kso_mapping) == KEYBOARD_COLS_MAX); - -test_mockable void keyboard_raw_drive_column(int col) -{ - int kso_val, val; - - /* Tri-state all outputs */ - if (col == KEYBOARD_COLUMN_NONE) { - /* KSO[22:11, 6:0] output high */ - kso_val = IT8801_REG_MASK_KSOSDIC | IT8801_REG_MASK_AKSOSC; - - if (IS_ENABLED(CONFIG_KEYBOARD_COL2_INVERTED)) { - /* Output low(so not selected). */ - it8801_read(IT8801_REG_GPIOG2SOVR, &val); - it8801_write(IT8801_REG_GPIOG2SOVR, val & - ~IT8801_REG_GPIO23SOV); - } - } - /* Assert all outputs */ - else if (col == KEYBOARD_COLUMN_ALL) { - /* KSO[22:11, 6:0] output low */ - kso_val = IT8801_REG_MASK_AKSOSC; - - if (IS_ENABLED(CONFIG_KEYBOARD_COL2_INVERTED)) { - /* Output high(so selected). */ - it8801_read(IT8801_REG_GPIOG2SOVR, &val); - it8801_write(IT8801_REG_GPIOG2SOVR, val | - IT8801_REG_GPIO23SOV); - } - } else { - /* To check if column is valid or not. */ - if (col >= KEYBOARD_COLS_MAX) - return; - /* - * Selected KSO[20, 18:11, 6:3, 1:0] output low, - * all others KSO output high. - */ - kso_val = kso_mapping[col]; - - if (IS_ENABLED(CONFIG_KEYBOARD_COL2_INVERTED)) { - /* GPIO23 is inverted. */ - if (col == IT8801_REG_MASK_SELKSO2) { - /* Output high(so selected). */ - it8801_read(IT8801_REG_GPIOG2SOVR, &val); - it8801_write(IT8801_REG_GPIOG2SOVR, val | - IT8801_REG_GPIO23SOV); - } else { - /* Output low(so not selected). */ - it8801_read(IT8801_REG_GPIOG2SOVR, &val); - it8801_write(IT8801_REG_GPIOG2SOVR, val & - ~IT8801_REG_GPIO23SOV); - } - } - } - - it8801_write(IT8801_REG_KSOMCR, kso_val); -} - -test_mockable int keyboard_raw_read_rows(void) -{ - int data = 0; - int ksieer = 0; - - it8801_read(IT8801_REG_KSIDR, &data); - - /* This register needs to write clear after reading data */ - it8801_read(IT8801_REG_KSIEER, &ksieer); - it8801_write(IT8801_REG_KSIEER, ksieer); - - /* Bits are active-low, so invert returned levels */ - return (~data) & 0xff; -} - -void keyboard_raw_enable_interrupt(int enable) -{ - if (enable) { - it8801_write(IT8801_REG_KSIEER, 0xff); - gpio_clear_pending_interrupt(GPIO_IT8801_SMB_INT); - gpio_enable_interrupt(GPIO_IT8801_SMB_INT); - } else { - gpio_disable_interrupt(GPIO_IT8801_SMB_INT); - } -} - -void io_expander_it8801_interrupt(enum gpio_signal signal) -{ - /* Wake the scan task */ - task_wake(TASK_ID_KEYSCAN); -} - -static void dump_register(int reg) -{ - int rv; - int data; - - ccprintf("[%Xh] = ", reg); - - rv = it8801_read(reg, &data); - - if (!rv) - ccprintf("0x%02x\n", data); - else - ccprintf("ERR (%d)\n", rv); -} - -static int it8801_dump(int argc, char **argv) -{ - dump_register(IT8801_REG_KSIIER); - dump_register(IT8801_REG_KSIEER); - dump_register(IT8801_REG_KSIDR); - dump_register(IT8801_REG_KSOMCR); - - return EC_SUCCESS; -} -DECLARE_CONSOLE_COMMAND(it8801_dump, it8801_dump, "NULL", - "Dumps IT8801 registers"); |