| /* Copyright (c) 2014 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. |
| * |
| * Pericom PI3USB3281 USB port switch driver. |
| */ |
| |
| #include "console.h" |
| #include "gpio.h" |
| #include "hooks.h" |
| #include "i2c.h" |
| #include "timer.h" |
| #include "pi3usb9281.h" |
| #include "util.h" |
| |
| /* Console output macros */ |
| #define CPUTS(outstr) cputs(CC_USBCHARGE, outstr) |
| #define CPRINTS(format, args...) cprints(CC_USBCHARGE, format, ## args) |
| |
| /* 8-bit I2C address */ |
| #define PI3USB9281_I2C_ADDR (0x25 << 1) |
| |
| /* Delay values */ |
| #define PI3USB9281_SW_RESET_DELAY 20 |
| |
| #ifdef CONFIG_USB_SWITCH_PI3USB9281_MUX_GPIO |
| #define PI3USB9281_COUNT 2 |
| static inline void select_chip(uint8_t chip_idx) |
| { |
| gpio_set_level(CONFIG_USB_SWITCH_PI3USB9281_MUX_GPIO, chip_idx); |
| } |
| #else |
| #define PI3USB9281_COUNT 1 |
| #define select_chip(x) |
| #endif |
| |
| static int saved_interrupts[PI3USB9281_COUNT]; |
| |
| uint8_t pi3usb9281_read(uint8_t chip_idx, uint8_t reg) |
| { |
| int res, val; |
| |
| select_chip(chip_idx); |
| res = i2c_read8(I2C_PORT_MASTER, PI3USB9281_I2C_ADDR, reg, &val); |
| if (res) |
| return 0xee; |
| |
| return val; |
| } |
| |
| int pi3usb9281_write(uint8_t chip_idx, uint8_t reg, uint8_t val) |
| { |
| int res; |
| |
| select_chip(chip_idx); |
| res = i2c_write8(I2C_PORT_MASTER, PI3USB9281_I2C_ADDR, reg, val); |
| if (res) |
| CPRINTS("PI3USB9281 I2C write failed"); |
| return res; |
| } |
| |
| int pi3usb9281_enable_interrupts(uint8_t chip_idx) |
| { |
| int ctrl = pi3usb9281_read(chip_idx, PI3USB9281_REG_CONTROL); |
| |
| if (ctrl == 0xee) |
| return EC_ERROR_UNKNOWN; |
| |
| return pi3usb9281_write(chip_idx, PI3USB9281_REG_CONTROL, ctrl & 0x14); |
| } |
| |
| int pi3usb9281_disable_interrupts(uint8_t chip_idx) |
| { |
| int ctrl = pi3usb9281_read(chip_idx, PI3USB9281_REG_CONTROL); |
| int rv; |
| |
| if (ctrl == 0xee) |
| return EC_ERROR_UNKNOWN; |
| |
| rv = pi3usb9281_write(chip_idx, PI3USB9281_REG_CONTROL, |
| (ctrl | PI3USB9281_CTRL_INT_MASK) & 0x15); |
| pi3usb9281_get_interrupts(chip_idx); |
| return rv; |
| } |
| |
| int pi3usb9281_set_interrupt_mask(uint8_t chip_idx, uint8_t mask) |
| { |
| return pi3usb9281_write(chip_idx, PI3USB9281_REG_INT_MASK, ~mask); |
| } |
| |
| int pi3usb9281_get_interrupts(uint8_t chip_idx) |
| { |
| int ret = pi3usb9281_peek_interrupts(chip_idx); |
| |
| if (chip_idx >= PI3USB9281_COUNT) |
| return EC_ERROR_PARAM1; |
| |
| saved_interrupts[chip_idx] = 0; |
| return ret; |
| } |
| |
| int pi3usb9281_peek_interrupts(uint8_t chip_idx) |
| { |
| if (chip_idx >= PI3USB9281_COUNT) |
| return EC_ERROR_PARAM1; |
| |
| saved_interrupts[chip_idx] |= pi3usb9281_read(chip_idx, |
| PI3USB9281_REG_INT); |
| return saved_interrupts[chip_idx]; |
| } |
| |
| int pi3usb9281_get_device_type(uint8_t chip_idx) |
| { |
| return pi3usb9281_read(chip_idx, PI3USB9281_REG_DEV_TYPE) & 0x77; |
| } |
| |
| int pi3usb9281_get_charger_status(uint8_t chip_idx) |
| { |
| return pi3usb9281_read(chip_idx, PI3USB9281_REG_CHG_STATUS) & 0x1f; |
| } |
| |
| int pi3usb9281_get_vbus(uint8_t chip_idx) |
| { |
| int vbus = pi3usb9281_read(chip_idx, PI3USB9281_REG_VBUS); |
| if (vbus == 0xee) |
| return EC_ERROR_UNKNOWN; |
| |
| return !!(vbus & 0x2); |
| } |
| |
| int pi3usb9281_reset(uint8_t chip_idx) |
| { |
| int rv = pi3usb9281_write(chip_idx, PI3USB9281_REG_RESET, 0x1); |
| |
| if (!rv) |
| /* Reset takes ~15ms. Wait for 20ms to be safe. */ |
| msleep(PI3USB9281_SW_RESET_DELAY); |
| |
| return rv; |
| } |
| |
| int pi3usb9281_set_switch_manual(uint8_t chip_idx, int val) |
| { |
| int ctrl; |
| int rv; |
| |
| ctrl = pi3usb9281_read(chip_idx, PI3USB9281_REG_CONTROL); |
| if (ctrl == 0xee) |
| return EC_ERROR_UNKNOWN; |
| |
| if (val) |
| rv = pi3usb9281_write(chip_idx, PI3USB9281_REG_CONTROL, |
| ctrl & ~PI3USB9281_CTRL_AUTO); |
| else |
| rv = pi3usb9281_write(chip_idx, PI3USB9281_REG_CONTROL, |
| ctrl | PI3USB9281_CTRL_AUTO); |
| |
| return rv; |
| } |
| |
| int pi3usb9281_set_pins(uint8_t chip_idx, uint8_t val) |
| { |
| return pi3usb9281_write(chip_idx, PI3USB9281_REG_MANUAL, val); |
| } |
| |
| static void pi3usb9281_init(void) |
| { |
| uint8_t dev_id; |
| int i; |
| |
| for (i = 0; i < PI3USB9281_COUNT; i++) { |
| dev_id = pi3usb9281_read(i, PI3USB9281_REG_DEV_ID); |
| |
| if (dev_id != 0x10) |
| CPRINTS("PI3USB9281[%d] invalid ID 0x%02x", i, dev_id); |
| } |
| } |
| DECLARE_HOOK(HOOK_INIT, pi3usb9281_init, HOOK_PRIO_LAST); |