Messages in this thread Patch in this message | | | From | Hans de Goede <> | Subject | [PATCH 2/5] extcon: Add FUSB302 USB TYPE-C controller support | Date | Fri, 21 Apr 2017 15:01:16 +0200 |
| |
Add support for USB TYPE-C cable detection on systems using a FUSB302 USB TYPE-C controller.
Signed-off-by: Hans de Goede <hdegoede@redhat.com> --- drivers/extcon/Kconfig | 8 + drivers/extcon/Makefile | 1 + drivers/extcon/extcon-fusb302.c | 782 ++++++++++++++++++++++++++++++++++++++++ 3 files changed, 791 insertions(+) create mode 100644 drivers/extcon/extcon-fusb302.c
diff --git a/drivers/extcon/Kconfig b/drivers/extcon/Kconfig index 32f2dc8..562db5b 100644 --- a/drivers/extcon/Kconfig +++ b/drivers/extcon/Kconfig @@ -35,6 +35,14 @@ config EXTCON_AXP288 Say Y here to enable support for USB peripheral detection and USB MUX switching by X-Power AXP288 PMIC. +config EXTCON_FUSB302 + tristate "FUSB302 USB TYPE-C controller support" + depends on I2C + select REGMAP_I2C + help + Say Y here to enable support for USB TYPE-C cable detection using + a FUSB302 USB TYPE-C controller. + config EXTCON_GPIO tristate "GPIO extcon support" depends on GPIOLIB || COMPILE_TEST diff --git a/drivers/extcon/Makefile b/drivers/extcon/Makefile index ecfa958..e5eb493 100644 --- a/drivers/extcon/Makefile +++ b/drivers/extcon/Makefile @@ -7,6 +7,7 @@ extcon-core-objs += extcon.o devres.o obj-$(CONFIG_EXTCON_ADC_JACK) += extcon-adc-jack.o obj-$(CONFIG_EXTCON_ARIZONA) += extcon-arizona.o obj-$(CONFIG_EXTCON_AXP288) += extcon-axp288.o +obj-$(CONFIG_EXTCON_FUSB302) += extcon-fusb302.o obj-$(CONFIG_EXTCON_GPIO) += extcon-gpio.o obj-$(CONFIG_EXTCON_INTEL_INT3496) += extcon-intel-int3496.o obj-$(CONFIG_EXTCON_INTEL_CHT_WC) += extcon-intel-cht-wc.o diff --git a/drivers/extcon/extcon-fusb302.c b/drivers/extcon/extcon-fusb302.c new file mode 100644 index 0000000..577adb9 --- /dev/null +++ b/drivers/extcon/extcon-fusb302.c @@ -0,0 +1,782 @@ +/* + * Extcon USB-C cable detection driver for FUSB302 USB TYPE-C controller + * + * Copyright (C) 2017 Hans de Goede <hdegoede@redhat.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/extcon.h> +#include <linux/i2c.h> +#include <linux/interrupt.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/regmap.h> +#include <linux/slab.h> +#include <linux/workqueue.h> +#include "extcon.h" + +#define REG_DEVICE_ID 0x01 +#define DEVICE_ID_VER_MASK GENMASK(7, 4) +#define DEVICE_ID_FUSB302_VER 0x80 + +#define REG_SWITCHES0 0x02 +#define SWITCHES0_PDWN1 BIT(0) +#define SWITCHES0_PDWN2 BIT(1) +#define SWITCHES0_PDWN GENMASK(1, 0) +#define SWITCHES0_MEAS_CC1 BIT(2) +#define SWITCHES0_MEAS_CC2 BIT(3) +#define SWITCHES0_VCONN_CC1 BIT(4) +#define SWITCHES0_VCONN_CC2 BIT(5) +#define SWITCHES0_PU_EN1 BIT(6) +#define SWITCHES0_PU_EN2 BIT(7) + +#define REG_MEASURE 0x04 +#define MEASURE_MDAC_MASK GENMASK(5, 0) +/* Datasheet says MDAC must be set to 0x34 / 2226mV for vRd-3.0 detection */ +#define MEASURE_MDAC_SNK_VRD30 0x34 +/* MDAC must be set to 0x25 / 1600mV for disconnect det. with 80uA host-cur */ +#define MEASURE_MDAC_SRC_80UA_HOST_CUR 0x25 + +#define REG_CONTROL0 0x06 +#define CONTROL0_HOST_CUR_MASK GENMASK(3, 2) +#define CONTROL0_HOST_CUR_DISABLED (0 << 2) +#define CONTROL0_HOST_CUR_80UA (1 << 2) +#define CONTROL0_HOST_CUR_180UA (2 << 2) +#define CONTROL0_HOST_CUR_330UA (3 << 2) +#define CONTROL0_INT_MASK BIT(5) + +#define REG_CONTROL2 0x08 +#define CONTROL2_TOGGLE BIT(0) +#define CONTROL2_MODE_MASK GENMASK(2, 1) +#define CONTROL2_MODE_DRP (1 << 1) +#define CONTROL2_MODE_SNK (2 << 1) +#define CONTROL2_MODE_SRC (3 << 1) +#define CONTROL2_SAVE_PWR_MASK GENMASK(7, 6) +#define CONTROL2_SAVE_PWR_DISABLED (0 << 6) +#define CONTROL2_SAVE_PWR_40MS (1 << 6) +#define CONTROL2_SAVE_PWR_80MS (2 << 6) +#define CONTROL2_SAVE_PWR_160MS (3 << 6) + +#define REG_MASK1 0x0a +/* REG_MASK1 value for low-power / disabled state from datasheet */ +#define MASK1_DISABLED 0xfe +#define MASK1_COMP_CHNG BIT(5) +#define MASK1_VBUSOK BIT(7) + +#define REG_POWER 0x0b +/* REG_POWER values for disabled and normal state from datasheet */ +#define POWER_DISABLED BIT(0) +#define POWER_NORMAL GENMASK(2, 0) + +#define REG_RESET 0x0c +#define RESET_SW_RESET BIT(0) + +#define REG_OCP 0x0d + +#define REG_MASKA 0x0e +/* REG_MASKA value for low-power / disabled state from datasheet */ +#define MASKA_DISABLED 0xbf + +#define REG_MASKB 0x0f +/* REG_MASKB value for low-power / disabled state from datasheet */ +#define MASKB_DISABLED 0x01 + +#define REG_STATUS1A 0x3d +#define STATUS1A_TOGSS_MASK GENMASK(5, 3) +#define STATUS1A_TOGSS_SRC_CC1 (1 << 3) +#define STATUS1A_TOGSS_SRC_CC2 (2 << 3) +#define STATUS1A_TOGSS_SNK_CC1 (5 << 3) +#define STATUS1A_TOGSS_SNK_CC2 (6 << 3) + +#define REG_INTERRUPTA 0x3e +#define INTERRUPTA_TOGDONE BIT(6) + +#define REG_STATUS0 0x40 +#define STATUS0_BC_LEVEL_MASK GENMASK(1, 0) +#define STATUS0_BC_LEVEL_VRA 0 +#define STATUS0_BC_LEVEL_VRDUSB 1 +#define STATUS0_BC_LEVEL_VRD15 2 +#define STATUS0_BC_LEVEL_VRD30 3 +#define STATUS0_COMP BIT(5) +#define STATUS0_VBUSOK BIT(7) + +#define REG_INTERRUPT 0x42 +#define INTERRUPT_BC_LVL BIT(0) +#define INTERRUPT_COMP_CHNG BIT(5) +#define INTERRUPT_VBUSOK BIT(7) + +/* Timeouts from the FUSB302 datasheet */ +#define TTOGCYCLE msecs_to_jiffies(40 + 60 + 40) + +/* Timeouts from the USB-C specification */ +#define TPDDEBOUNCE msecs_to_jiffies(20) +#define TDRPTRY_MS 75 +#define TDRPTRY msecs_to_jiffies(TDRPTRY_MS) +#define TDRPTRYWAIT msecs_to_jiffies(400) +#define TVBUSON msecs_to_jiffies(275) + +enum typec_port_type { + TYPEC_PORT_DFP, + TYPEC_PORT_UFP, + TYPEC_PORT_DRP, +}; + +enum typec_role { + TYPEC_SINK, + TYPEC_SOURCE, +}; + +enum fusb302_state { + DISABLED_SNK, /* UFP */ + DISABLED_SRC, /* DFP */ + DISABLED_DRP, + UNATTACHED_SNK, + ATTACHED_SNK, + UNATTACHED_SRC, + ATTACHED_SRC, +}; +/* For debugging */ +static __maybe_unused const char *fusb302_state_str[] = { + "DISABLED_SNK", + "DISABLED_SRC", + "DISABLED_DRP", + "UNATTACHED_SNK", + "ATTACHED_SNK", + "UNATTACHED_SRC", + "ATTACHED_SRC", +}; + +enum fusb302_event { + TOGGLE_DONE, + BC_LVL_CHANGE, + VBUS_VALID, + VBUS_INVALID, + COMP_LOW, + COMP_HIGH, + TIMEOUT, + FALLBACK_TIMEOUT, +}; +/* For debugging */ +static __maybe_unused const char *fusb302_event_str[] = { + "TOGGLE_DONE", + "BC_LVL_CHANGE", + "VBUS_VALID", + "VBUS_INVALID", + "COMP_LOW", + "COMP_HIGH", + "TIMEOUT", + "FALLBACK_TIMEOUT", +}; + +static const unsigned int fusb302_extcon_cables[] = { + EXTCON_USB, + EXTCON_USB_HOST, + EXTCON_CHG_USB_SDP, + EXTCON_CHG_USB_CDP, + EXTCON_CHG_USB_FAST, + EXTCON_NONE, +}; + +struct fusb302_data { + struct device *dev; + struct regmap *regmap; + struct extcon_dev *edev; + struct mutex lock; + struct delayed_work timeout; + struct delayed_work fallback_timeout; + struct delayed_work bc_work; + enum fusb302_state state; + enum typec_port_type port_type; + enum typec_role preferred_role; + int status0; + int status1a; + unsigned int snk_cable_id; +}; + +static void fusb302_write_reg(struct fusb302_data *data, int reg, int val) +{ + int ret; + + ret = regmap_write(data->regmap, reg, val); + if (ret) + dev_err(data->dev, "Error writing reg %02x: %d\n", reg, ret); +} + +static int fusb302_read_reg(struct fusb302_data *data, int reg) +{ + int ret, val; + + ret = regmap_read(data->regmap, reg, &val); + if (ret) { + dev_err(data->dev, "Error reading reg %02x: %d\n", reg, ret); + return 0; + } + + return val; +} + +static void fusb302_update_bits(struct fusb302_data *data, int reg, + int mask, int val) +{ + int ret; + + ret = regmap_update_bits(data->regmap, reg, mask, val); + if (ret) + dev_err(data->dev, "Error modifying reg %02x: %d\n", reg, ret); +} + +/* Small helper to sync EXTCON_CHG_USB_SDP and EXTCON_USB state */ +static void fusb302_set_extcon_state(struct fusb302_data *data, + unsigned int cable, bool state) +{ + extcon_set_state_sync(data->edev, cable, state); + if (cable == EXTCON_CHG_USB_SDP) + extcon_set_state_sync(data->edev, EXTCON_USB, state); +} + +/* Helper for the disabled states */ +static void fusb302_disable(struct fusb302_data *data) +{ + fusb302_write_reg(data, REG_POWER, POWER_DISABLED); + fusb302_write_reg(data, REG_MASK1, MASK1_DISABLED); + fusb302_write_reg(data, REG_MASKA, MASKA_DISABLED); + fusb302_write_reg(data, REG_MASKB, MASKB_DISABLED); + fusb302_update_bits(data, REG_CONTROL2, CONTROL2_TOGGLE, 0); +} + +/* + * fusb302_set_state() and fusb302_handle_event() implement the 3 state + * machines from the datasheet folded into 1 state-machine for code re-use. + */ +static void fusb302_set_state(struct fusb302_data *data, + enum fusb302_state state) +{ + int status, switches0 = 0; + enum fusb302_state old_state = data->state; + union extcon_property_value prop; + + /* Kill pending timeouts from previous state */ + cancel_delayed_work(&data->timeout); + cancel_delayed_work(&data->fallback_timeout); + cancel_delayed_work(&data->bc_work); + + dev_dbg(data->dev, "New state %s\n", fusb302_state_str[state]); + + switch (old_state) { + case ATTACHED_SNK: + fusb302_set_extcon_state(data, data->snk_cable_id, false); + break; + case ATTACHED_SRC: + fusb302_set_extcon_state(data, EXTCON_USB_HOST, false); + break; + default: + break; /* Do nothing */ + } + + switch (state) { + case DISABLED_SNK: + fusb302_disable(data); + fusb302_update_bits(data, REG_CONTROL2, CONTROL2_MODE_MASK, + CONTROL2_MODE_SNK); + fusb302_update_bits(data, REG_CONTROL2, CONTROL2_TOGGLE, + CONTROL2_TOGGLE); + break; + + case DISABLED_SRC: + fusb302_disable(data); + fusb302_update_bits(data, REG_CONTROL2, CONTROL2_MODE_MASK, + CONTROL2_MODE_SRC); + fusb302_update_bits(data, REG_CONTROL2, CONTROL2_TOGGLE, + CONTROL2_TOGGLE); + break; + + case DISABLED_DRP: + fusb302_disable(data); + fusb302_update_bits(data, REG_CONTROL2, CONTROL2_MODE_MASK, + CONTROL2_MODE_DRP); + fusb302_update_bits(data, REG_CONTROL2, CONTROL2_TOGGLE, + CONTROL2_TOGGLE); + break; + + case UNATTACHED_SNK: + fusb302_write_reg(data, REG_POWER, POWER_NORMAL); + + /* Enable pull-down on CC1 / CC2 based on orientation */ + switch (data->status1a & STATUS1A_TOGSS_MASK) { + case STATUS1A_TOGSS_SNK_CC1: + switches0 = SWITCHES0_PDWN1 | SWITCHES0_MEAS_CC1; + prop.intval = USB_TYPEC_POLARITY_NORMAL; + break; + case STATUS1A_TOGSS_SNK_CC2: + switches0 = SWITCHES0_PDWN2 | SWITCHES0_MEAS_CC2; + prop.intval = USB_TYPEC_POLARITY_FLIP; + break; + } + fusb302_write_reg(data, REG_SWITCHES0, switches0); + fusb302_update_bits(data, REG_CONTROL2, CONTROL2_TOGGLE, 0); + extcon_set_property(data->edev, EXTCON_USB, + EXTCON_PROP_USB_TYPEC_POLARITY, prop); + + /* Enable VBUSOK and COMP irq at 2.24V for BC detection */ + fusb302_update_bits(data, REG_MASK1, + MASK1_VBUSOK | MASK1_COMP_CHNG, 0); + fusb302_update_bits(data, REG_MEASURE, MEASURE_MDAC_MASK, + MEASURE_MDAC_SNK_VRD30); + + status = fusb302_read_reg(data, REG_STATUS0); + if (status & STATUS0_VBUSOK) { + /* Go straight to ATTACHED_SNK */ + fusb302_set_state(data, ATTACHED_SNK); + return; + } + + mod_delayed_work(system_wq, &data->timeout, TVBUSON); + break; + + case ATTACHED_SNK: + mod_delayed_work(system_wq, &data->bc_work, TPDDEBOUNCE); + break; + + case UNATTACHED_SRC: + fusb302_write_reg(data, REG_POWER, POWER_NORMAL); + + /* Enable pull-up / Vconn on CC1 / CC2 based on orientation */ + switch (data->status1a & STATUS1A_TOGSS_MASK) { + case STATUS1A_TOGSS_SRC_CC1: + switches0 = SWITCHES0_PU_EN1 | SWITCHES0_VCONN_CC2 | + SWITCHES0_MEAS_CC1; + prop.intval = USB_TYPEC_POLARITY_NORMAL; + break; + case STATUS1A_TOGSS_SRC_CC2: + switches0 = SWITCHES0_PU_EN2 | SWITCHES0_VCONN_CC1 | + SWITCHES0_MEAS_CC2; + prop.intval = USB_TYPEC_POLARITY_FLIP; + break; + } + fusb302_write_reg(data, REG_SWITCHES0, switches0); + fusb302_update_bits(data, REG_CONTROL2, CONTROL2_TOGGLE, 0); + extcon_set_property(data->edev, EXTCON_USB, + EXTCON_PROP_USB_TYPEC_POLARITY, prop); + + /* Enable COMP irq at 1.6V for detach detection */ + fusb302_update_bits(data, REG_MASK1, MASK1_COMP_CHNG, 0); + fusb302_update_bits(data, REG_MEASURE, MEASURE_MDAC_MASK, + MEASURE_MDAC_SRC_80UA_HOST_CUR); + + status = fusb302_read_reg(data, REG_STATUS0); + if (!(status & STATUS0_COMP)) { + /* Go straight to ATTACHED_SRC */ + fusb302_set_state(data, ATTACHED_SRC); + return; + } + + mod_delayed_work(system_wq, &data->timeout, TPDDEBOUNCE); + break; + + case ATTACHED_SRC: + fusb302_set_extcon_state(data, EXTCON_USB_HOST, true); + break; + } + + data->state = state; +} + +static void fusb302_set_state_disabled(struct fusb302_data *data) +{ + + switch (data->port_type) { + case TYPEC_PORT_UFP: + fusb302_set_state(data, DISABLED_SNK); + break; + case TYPEC_PORT_DFP: + fusb302_set_state(data, DISABLED_SRC); + break; + case TYPEC_PORT_DRP: + fusb302_set_state(data, DISABLED_DRP); + break; + } +} + +static void fusb302_handle_disabled_snk_event(struct fusb302_data *data, + int event) +{ + switch (event) { + case TOGGLE_DONE: + switch (data->status1a & STATUS1A_TOGSS_MASK) { + case STATUS1A_TOGSS_SNK_CC1: + case STATUS1A_TOGSS_SNK_CC2: + fusb302_set_state(data, UNATTACHED_SNK); + break; + } + break; + + case TIMEOUT: + /* Cannot become snk fallback to src */ + fusb302_set_state(data, DISABLED_SRC); + mod_delayed_work(system_wq, &data->fallback_timeout, + TDRPTRYWAIT); + break; + + case FALLBACK_TIMEOUT: + /* Both states failed return to disabled drp state */ + fusb302_set_state(data, DISABLED_DRP); + break; + } +} + +static void fusb302_handle_disabled_src_event(struct fusb302_data *data, + int event) +{ + switch (event) { + case TOGGLE_DONE: + switch (data->status1a & STATUS1A_TOGSS_MASK) { + case STATUS1A_TOGSS_SRC_CC1: + case STATUS1A_TOGSS_SRC_CC2: + fusb302_set_state(data, UNATTACHED_SRC); + break; + } + break; + + case TIMEOUT: + /* Cannot become src fallback to snk */ + fusb302_set_state(data, DISABLED_SNK); + mod_delayed_work(system_wq, &data->fallback_timeout, + TDRPTRYWAIT); + break; + + case FALLBACK_TIMEOUT: + /* Both states failed return to disabled drp state */ + fusb302_set_state(data, DISABLED_DRP); + break; + } +} + +static void fusb302_handle_disabled_drp_event(struct fusb302_data *data, + int event) +{ + switch (event) { + case TOGGLE_DONE: + switch (data->status1a & STATUS1A_TOGSS_MASK) { + case STATUS1A_TOGSS_SNK_CC1: + case STATUS1A_TOGSS_SNK_CC2: + if (data->preferred_role == TYPEC_SINK) { + /* Jump directly to UNATTACHED_SNK */ + fusb302_set_state(data, UNATTACHED_SNK); + } else { + /* Try to become src */ + fusb302_set_state(data, DISABLED_SNK); + mod_delayed_work(system_wq, &data->timeout, + TDRPTRY); + } + break; + case STATUS1A_TOGSS_SRC_CC1: + case STATUS1A_TOGSS_SRC_CC2: + if (data->preferred_role == TYPEC_SOURCE) { + /* Jump directly to UNATTACHED_SRC */ + fusb302_set_state(data, UNATTACHED_SRC); + } else { + /* + * The USB-C spec says we must enable pull-downs + * and then wait tDRPTry before checking to + * avoid endless role-bouncing if both ends + * prefer the snk role. + */ + fusb302_write_reg(data, REG_SWITCHES0, + SWITCHES0_PDWN); + fusb302_update_bits(data, REG_CONTROL2, + CONTROL2_TOGGLE, 0); + msleep(TDRPTRY_MS); + /* + * Use the toggle engine to do the src + * detection to keep things the same as for + * directly entering the src role. + */ + fusb302_set_state(data, DISABLED_SNK); + mod_delayed_work(system_wq, &data->timeout, + TTOGCYCLE); + } + break; + } + break; + } +} + +static void fusb302_handle_unattached_snk_event(struct fusb302_data *data, + int event) +{ + switch (event) { + case VBUS_VALID: /* Cable attached */ + fusb302_set_state(data, ATTACHED_SNK); + break; + case TIMEOUT: + fusb302_set_state_disabled(data); + break; + } +} + +static void fusb302_handle_attached_snk_event(struct fusb302_data *data, + int event) +{ + switch (event) { + case BC_LVL_CHANGE: + case COMP_LOW: + case COMP_HIGH: + mod_delayed_work(system_wq, &data->bc_work, TPDDEBOUNCE); + break; + case VBUS_INVALID: /* Cable detached */ + fusb302_set_state_disabled(data); + break; + } +} + +static void fusb302_handle_unattached_src_event(struct fusb302_data *data, + int event) +{ + switch (event) { + case COMP_LOW: /* Cable attached */ + fusb302_set_state(data, ATTACHED_SRC); + break; + case TIMEOUT: + fusb302_set_state_disabled(data); + break; + } +} + +static void fusb302_handle_attached_src_event(struct fusb302_data *data, + int event) +{ + switch (event) { + case COMP_HIGH: /* Cable detached */ + fusb302_set_state_disabled(data); + break; + } +} + +static void fusb302_handle_event(struct fusb302_data *data, int event) +{ + + mutex_lock(&data->lock); + + dev_dbg(data->dev, "Handling state %s event %s status %02x %02x\n", + fusb302_state_str[data->state], fusb302_event_str[event], + fusb302_read_reg(data, REG_STATUS0), + fusb302_read_reg(data, REG_STATUS1A)); + + switch (data->state) { + case DISABLED_SNK: + fusb302_handle_disabled_snk_event(data, event); + break; + case DISABLED_SRC: + fusb302_handle_disabled_src_event(data, event); + break; + case DISABLED_DRP: + fusb302_handle_disabled_drp_event(data, event); + break; + case UNATTACHED_SNK: + fusb302_handle_unattached_snk_event(data, event); + break; + case ATTACHED_SNK: + fusb302_handle_attached_snk_event(data, event); + break; + case UNATTACHED_SRC: + fusb302_handle_unattached_src_event(data, event); + break; + case ATTACHED_SRC: + fusb302_handle_attached_src_event(data, event); + break; + } + mutex_unlock(&data->lock); +} + +static void fusb302_timeout(struct work_struct *work) +{ + struct fusb302_data *data = + container_of(work, struct fusb302_data, timeout.work); + + fusb302_handle_event(data, TIMEOUT); +} + +static void fusb302_fallback_timeout(struct work_struct *work) +{ + struct fusb302_data *data = + container_of(work, struct fusb302_data, fallback_timeout.work); + + fusb302_handle_event(data, FALLBACK_TIMEOUT); +} + +static void fusb302_report_bc_level(struct work_struct *work) +{ + struct fusb302_data *data = + container_of(work, struct fusb302_data, bc_work.work); + + /* Clear old charger cable id */ + fusb302_set_extcon_state(data, data->snk_cable_id, false); + + if (data->status0 & STATUS0_COMP) { + dev_warn(data->dev, "vRd over maximum, assuming 500mA source\n"); + data->snk_cable_id = EXTCON_CHG_USB_SDP; + } else { + switch (data->status0 & STATUS0_BC_LEVEL_MASK) { + case STATUS0_BC_LEVEL_VRA: + case STATUS0_BC_LEVEL_VRDUSB: + data->snk_cable_id = EXTCON_CHG_USB_SDP; + break; + case STATUS0_BC_LEVEL_VRD15: + data->snk_cable_id = EXTCON_CHG_USB_CDP; + break; + case STATUS0_BC_LEVEL_VRD30: + /* Use CHG_USB_FAST to indicate 3A capability */ + data->snk_cable_id = EXTCON_CHG_USB_FAST; + break; + } + } + fusb302_set_extcon_state(data, data->snk_cable_id, true); +} + +static irqreturn_t fusb302_irq_handler_thread(int irq, void *handler_data) +{ + struct fusb302_data *data = handler_data; + int interrupt, interrupta; + + interrupt = fusb302_read_reg(data, REG_INTERRUPT); + interrupta = fusb302_read_reg(data, REG_INTERRUPTA); + + if (interrupt) + data->status0 = fusb302_read_reg(data, REG_STATUS0); + + if (interrupta) + data->status1a = fusb302_read_reg(data, REG_STATUS1A); + + dev_dbg(data->dev, "Handling interrupt %02x %02x status %02x %02x\n", + interrupt, interrupta, data->status0, data->status1a); + + if (interrupt & INTERRUPT_BC_LVL) + fusb302_handle_event(data, BC_LVL_CHANGE); + + if (interrupt & INTERRUPT_COMP_CHNG) { + if (data->status0 & STATUS0_COMP) + fusb302_handle_event(data, COMP_HIGH); + else + fusb302_handle_event(data, COMP_LOW); + } + + if (interrupt & INTERRUPT_VBUSOK) { + if (data->status0 & STATUS0_VBUSOK) + fusb302_handle_event(data, VBUS_VALID); + else + fusb302_handle_event(data, VBUS_INVALID); + } + + if (interrupta & INTERRUPTA_TOGDONE) + fusb302_handle_event(data, TOGGLE_DONE); + + return IRQ_HANDLED; +} + +static const struct regmap_config fusb302_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .val_format_endian = REGMAP_ENDIAN_NATIVE, +}; + +static int fusb302_probe(struct i2c_client *client) +{ + struct device *dev = &client->dev; + struct fusb302_data *data; + int ret; + + if (!client->irq) { + dev_err(dev, "Error irq not specified\n"); + return -EINVAL; + } + + data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->dev = dev; + /* TODO make these 2 configurable using device-properties */ + data->port_type = TYPEC_PORT_DRP; + data->preferred_role = TYPEC_SINK; + + data->regmap = devm_regmap_init_i2c(client, &fusb302_regmap_config); + if (IS_ERR(data->regmap)) { + ret = PTR_ERR(data->regmap); + dev_err(dev, "Error to initializing regmap: %d\n", ret); + return ret; + } + + mutex_init(&data->lock); + INIT_DELAYED_WORK(&data->timeout, fusb302_timeout); + INIT_DELAYED_WORK(&data->fallback_timeout, fusb302_fallback_timeout); + INIT_DELAYED_WORK(&data->bc_work, fusb302_report_bc_level); + + data->edev = devm_extcon_dev_allocate(dev, fusb302_extcon_cables); + if (IS_ERR(data->edev)) + return PTR_ERR(data->edev); + + data->edev->name = "fusb302"; + + ret = devm_extcon_dev_register(dev, data->edev); + if (ret) + return ret; + + extcon_set_property_capability(data->edev, EXTCON_USB, + EXTCON_PROP_USB_TYPEC_POLARITY); + + fusb302_write_reg(data, REG_RESET, RESET_SW_RESET); + usleep_range(10000, 20000); + + /* Enable power-saving */ + fusb302_update_bits(data, REG_CONTROL2, CONTROL2_SAVE_PWR_MASK, + CONTROL2_SAVE_PWR_40MS); + + fusb302_set_state_disabled(data); + + ret = devm_request_threaded_irq(dev, client->irq, NULL, + fusb302_irq_handler_thread, + IRQF_TRIGGER_LOW | IRQF_ONESHOT, "fusb302", data); + if (ret) { + dev_err(dev, "Error requesting irq: %d\n", ret); + return ret; + } + + fusb302_update_bits(data, REG_CONTROL0, CONTROL0_INT_MASK, 0); + + i2c_set_clientdata(client, data); + return 0; +} + +static int fusb302_remove(struct i2c_client *client) +{ + struct fusb302_data *data = i2c_get_clientdata(client); + + devm_free_irq(data->dev, client->irq, data); + cancel_delayed_work_sync(&data->timeout); + cancel_delayed_work_sync(&data->fallback_timeout); + + return 0; +} + +static const struct i2c_device_id fusb302_i2c_ids[] = { + { "fusb302" }, + { }, +}; +MODULE_DEVICE_TABLE(i2c, fusb302_i2c_ids); + +static struct i2c_driver fusb302_driver = { + .probe_new = fusb302_probe, + .remove = fusb302_remove, + .id_table = fusb302_i2c_ids, + .driver = { + .name = "fusb302", + }, +}; +module_i2c_driver(fusb302_driver); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>"); +MODULE_DESCRIPTION("FUSB302 USB TYPE-C controller Driver"); -- 2.9.3
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