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Subject[PATCH 2/5] extcon: Add FUSB302 USB TYPE-C controller support
Date
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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