Latest NVIDIA GPU cards have a Cypress CCGx Type-C controller
over I2C interface.
This UCSI I2C driver uses I2C bus driver interface for communicating
with Type-C controller.
Signed-off-by: Ajay Gupta <ajayg@xxxxxxxxxx>
---
drivers/usb/typec/ucsi/Kconfig | 10 +
drivers/usb/typec/ucsi/Makefile | 2 +
drivers/usb/typec/ucsi/ucsi_i2c_ccg.c | 591 ++++++++++++++++++++++++++++++++++
3 files changed, 603 insertions(+)
create mode 100644 drivers/usb/typec/ucsi/ucsi_i2c_ccg.c
diff --git a/drivers/usb/typec/ucsi/Kconfig b/drivers/usb/typec/ucsi/Kconfig
index e36d6c7..5136aeb 100644
--- a/drivers/usb/typec/ucsi/Kconfig
+++ b/drivers/usb/typec/ucsi/Kconfig
@@ -23,6 +23,16 @@ config TYPEC_UCSI
if TYPEC_UCSI
+config UCSI_I2C_CCG
+ tristate "UCSI I2C Interface Driver for Cypress CCGx"
+ depends on I2C_GPU
+ help
+ This driver enables UCSI support on NVIDIA GPUs that expose a
+ Cypress CCGx Type-C controller over I2C interface.
+
+ To compile the driver as a module, choose M here: the module will be
+ called ucsi_i2c_ccg.ko.
+
config UCSI_ACPI
tristate "UCSI ACPI Interface Driver"
depends on ACPI
diff --git a/drivers/usb/typec/ucsi/Makefile b/drivers/usb/typec/ucsi/Makefile
index 7afbea5..4439482 100644
--- a/drivers/usb/typec/ucsi/Makefile
+++ b/drivers/usb/typec/ucsi/Makefile
@@ -8,3 +8,5 @@ typec_ucsi-y := ucsi.o
typec_ucsi-$(CONFIG_TRACING) += trace.o
obj-$(CONFIG_UCSI_ACPI) += ucsi_acpi.o
+
+obj-$(CONFIG_UCSI_I2C_CCG) += ucsi_i2c_ccg.o
diff --git a/drivers/usb/typec/ucsi/ucsi_i2c_ccg.c b/drivers/usb/typec/ucsi/ucsi_i2c_ccg.c
new file mode 100644
index 0000000..587e3f8
--- /dev/null
+++ b/drivers/usb/typec/ucsi/ucsi_i2c_ccg.c
@@ -0,0 +1,591 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * UCSI I2C driver for Cypress CCGx Type-C controller
+ *
+ * Copyright (C) 2017-2018 NVIDIA Corporation. All rights reserved.
+ * Author: Ajay Gupta <ajayg@xxxxxxxxxx>
+ *
+ * Some code borrowed from drivers/usb/typec/ucsi/ucsi_acpi.c
+ */
+#include <linux/platform_device.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/acpi.h>
+#include <linux/i2c.h>
+#include <linux/pci.h>
+#include "ucsi.h"
+
+struct ucsi_i2c_ccg {
+ struct device *dev;
+ struct ucsi *ucsi;
+ struct ucsi_ppm ppm;
+ struct i2c_client *client;
+ int irq;
+ bool wake_enabled;
+ unsigned char ver;
+};
+
+#define CCGX_I2C_RAB_DEVICE_MODE 0x0000U
+#define CCGX_I2C_RAB_BOOT_MODE_REASON 0x0001U
+#define CCGX_I2C_RAB_READ_SILICON_ID 0x0002U
+#define CCGX_I2C_RAB_INTR_REG 0x0006U
+#define CCGX_I2C_RAB_RESET 0x0008U
+#define CCGX_I2C_RAB_READ_ALL_VERSION 0x0010U
+#define CCGX_I2C_RAB_READ_ALL_VERSION_BOOTLOADER \
+ (CCGX_I2C_RAB_READ_ALL_VERSION + 0x00)
+#define CCGX_I2C_RAB_READ_ALL_VERSION_BOOTLOADER_BASE \
+ (CCGX_I2C_RAB_READ_ALL_VERSION_BOOTLOADER + 0)
+#define CCGX_I2C_RAB_READ_ALL_VERSION_BOOTLOADER_FW \
+ (CCGX_I2C_RAB_READ_ALL_VERSION_BOOTLOADER + 4)
+#define CCGX_I2C_RAB_READ_ALL_VERSION_APP \
+ (CCGX_I2C_RAB_READ_ALL_VERSION + 0x08)
+#define CCGX_I2C_RAB_READ_ALL_VERSION_APP_BASE \
+ (CCGX_I2C_RAB_READ_ALL_VERSION_APP + 0)
+#define CCGX_I2C_RAB_READ_ALL_VERSION_APP_FW \
+ (CCGX_I2C_RAB_READ_ALL_VERSION_APP + 4)
+#define CCGX_I2C_RAB_FW2_VERSION 0x0020U
+#define CCGX_I2C_RAB_PDPORT_ENABLE 0x002CU
+#define CCGX_I2C_RAB_UCSI_STATUS 0x0038U
+#define CCGX_I2C_RAB_UCSI_CONTROL 0x0039U
+#define CCGX_I2C_RAB_UCSI_CONTROL_STOP 0x2U
+#define CCGX_I2C_RAB_UCSI_CONTROL_START 0x1U
+#define CCGX_I2C_RAB_HPI_VERSION 0x003CU
+#define CCGX_I2C_RAB_RESPONSE_REG 0x007EU
+#define CCGX_I2C_RAB_DM_CONTROL_1 0x1000U
+#define CCGX_I2C_RAB_WRITE_DATA_MEMORY_1 0x1800U
+#define CCGX_I2C_RAB_DM_CONTROL_2 0x2000U
+#define CCGX_I2C_RAB_WRITE_DATA_MEMORY_2 0x2800U
+#define CCGX_I2C_RAB_UCSI_DATA_BLOCK 0xf000U
+
+#define CCGX_I2C_RAB_RESPONSE_REG_RESET_COMPLETE 0x80
+
+static int ccg_read(struct ucsi_i2c_ccg *ui, u16 rab, u8 *data, u32 len)
+{
+ struct device *dev = ui->dev;
+ struct i2c_client *client = ui->client;
+ unsigned char buf[2];
+ struct i2c_msg msgs[] = {
+ {
+ .addr = client->addr,
+ .flags = 0x0,
+ .len = 0x2,
+ .buf = buf,
+ },
+ {
+ .addr = client->addr,
+ .flags = I2C_M_RD,
+ .buf = data,
+ },
+ };
+ u32 rlen, rem_len = len;
+ int err;
+
+ while (rem_len > 0) {
+ msgs[1].buf = &data[len - rem_len];
+ rlen = min_t(u16, rem_len, 4);
+ msgs[1].len = rlen;
+ buf[0] = (rab >> 0) & 0xff;
+ buf[1] = (rab >> 8) & 0xff;
+ err = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
+ if (err == ARRAY_SIZE(msgs)) {
+ err = 0;
+ } else if (err >= 0) {
+ dev_err(dev, "%s i2c_transfer failed, err %d\n",
+ __func__, err);
+ return -EIO;
+ }
+ rab += rlen;
+ rem_len -= rlen;
+ }
+
+ return err;
+}
+
+static int ccg_write(struct ucsi_i2c_ccg *ui, u16 rab, u8 *data, u32 len)
+{
+ struct device *dev = ui->dev;
+ struct i2c_client *client = ui->client;
+ unsigned char buf[2];
+ struct i2c_msg msgs[] = {
+ {
+ .addr = client->addr,
+ .flags = 0x0,
+ .len = 0x2,
+ .buf = buf,
+ },
+ {
+ .addr = client->addr,
+ .flags = 0x0,
+ .buf = data,
+ .len = len,
+ },
+ {
+ .addr = client->addr,
+ .flags = I2C_M_STOP,
+ },
+ };
+ int err;
+
+ buf[0] = (rab >> 0) & 0xff;
+ buf[1] = (rab >> 8) & 0xff;
+ err = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
+ if (err == ARRAY_SIZE(msgs)) {
+ err = 0;
+ } else if (err >= 0) {
+ dev_err(dev, "%s i2c_transfer failed, err %d\n",
+ __func__, err);
+ return -EIO;
+ }
+
+ return err;
+}
+
+static int ucsi_i2c_ccg_init(struct ucsi_i2c_ccg *ui)
+{
+ struct device *dev = ui->dev;
+ u8 data[64];
+ int i, err;
+
+ /* selectively issue device reset
+ * - if RESPONSE register is RESET_COMPLETE, do not issue device reset
+ * (will cause usb device disconnect / reconnect)
+ * - if RESPONSE register is not RESET_COMPLETE, issue device reset
+ * (causes PPC to resync device connect state by re-issuing
+ * set mux command)
+ */
+ data[0] = 0x00;
+ data[1] = 0x00;
+
+ err = ccg_read(ui, CCGX_I2C_RAB_RESPONSE_REG, data, 0x2);
+ if (err < 0) {
+ dev_err(dev, "%s ccg_read failed, err %d\n", __func__, err);
+ return -EIO;
+ }
+
+ dev_info(dev, "CCGX_I2C_RAB_RESPONSE_REG %02x", data[0]);
+
+ /* read device mode */
+ memset(data, 0, sizeof(data));
+
+ err = ccg_read(ui, CCGX_I2C_RAB_DEVICE_MODE, data, sizeof(data));
+ if (err < 0) {
+ dev_err(dev, "%s ccg_read failed, err %d\n", __func__, err);
+ return -EIO;
+ }
+
+ dev_info(dev, "[DEVICE_MODE] %02x (HPIv%c) (Flash row size %d)\n",
+ data[CCGX_I2C_RAB_DEVICE_MODE],
+ ((data[CCGX_I2C_RAB_DEVICE_MODE] >> 7) & 0x01) ? '2' : '1',
+ ((data[CCGX_I2C_RAB_DEVICE_MODE] >> 4) & 0x03) ? 256 : 128);
+
+ dev_info(dev, "(PD ports %d) (Firmware mode %d)\n",
+ ((data[CCGX_I2C_RAB_DEVICE_MODE] >> 2) & 0x03) ? 2 : 1,
+ ((data[CCGX_I2C_RAB_DEVICE_MODE] >> 0) & 0x03));
+
+ dev_info(dev, "[BOOT_MODE_REASON] %02x (Boot mode requested %d)\n",
+ data[CCGX_I2C_RAB_BOOT_MODE_REASON],
+ ((data[CCGX_I2C_RAB_BOOT_MODE_REASON] >> 0) & 0x01) ? 1 : 0);
+
+ dev_info(dev, "(FW1 valid %d) (FW2 valid %d)\n",
+ ((data[CCGX_I2C_RAB_BOOT_MODE_REASON] >> 2) & 0x01) ? 1 : 0,
+ ((data[CCGX_I2C_RAB_BOOT_MODE_REASON] >> 3) & 0x01) ? 1 : 0);
+
+ dev_info(dev, "[READ_SILICON_ID] %02x %02x",
+ data[CCGX_I2C_RAB_READ_SILICON_ID+0],
+ data[CCGX_I2C_RAB_READ_SILICON_ID+1]);
+
+ dev_info(dev, "[READ_ALL_VERSION][BOOTLOADER]\n");
+ dev_info(dev, "%02x %02x %02x %02x %02x %02x %02x %02x\n",
+ data[CCGX_I2C_RAB_READ_ALL_VERSION+0],
+ data[CCGX_I2C_RAB_READ_ALL_VERSION+1],
+ data[CCGX_I2C_RAB_READ_ALL_VERSION+2],
+ data[CCGX_I2C_RAB_READ_ALL_VERSION+3],
+ data[CCGX_I2C_RAB_READ_ALL_VERSION+4],
+ data[CCGX_I2C_RAB_READ_ALL_VERSION+5],
+ data[CCGX_I2C_RAB_READ_ALL_VERSION+6],
+ data[CCGX_I2C_RAB_READ_ALL_VERSION+7]);
+
+ dev_info(dev, "[READ_ALL_VERSION][FW1]\n");
+ dev_info(dev, "%02x %02x %02x %02x %02x %02x %02x %02x\n",
+ data[CCGX_I2C_RAB_READ_ALL_VERSION+8+0],
+ data[CCGX_I2C_RAB_READ_ALL_VERSION+8+1],
+ data[CCGX_I2C_RAB_READ_ALL_VERSION+8+2],
+ data[CCGX_I2C_RAB_READ_ALL_VERSION+8+3],
+ data[CCGX_I2C_RAB_READ_ALL_VERSION+8+4],
+ data[CCGX_I2C_RAB_READ_ALL_VERSION+8+5],
+ data[CCGX_I2C_RAB_READ_ALL_VERSION+8+6],
+ data[CCGX_I2C_RAB_READ_ALL_VERSION+8+7]);
+
+ dev_info(dev, "[FW2_VERSION] %02x %02x %02x %02x %02x %02x %02x %02x\n",
+ data[CCGX_I2C_RAB_FW2_VERSION+0],
+ data[CCGX_I2C_RAB_FW2_VERSION+1],
+ data[CCGX_I2C_RAB_FW2_VERSION+2],
+ data[CCGX_I2C_RAB_FW2_VERSION+3],
+ data[CCGX_I2C_RAB_FW2_VERSION+4],
+ data[CCGX_I2C_RAB_FW2_VERSION+5],
+ data[CCGX_I2C_RAB_FW2_VERSION+6],
+ data[CCGX_I2C_RAB_FW2_VERSION+7]);
+
+ /* read response register */
+ data[0] = 0x0;
+ data[1] = 0x0;
+
+ err = ccg_read(ui, CCGX_I2C_RAB_RESPONSE_REG, data, 0x2);
+ if (err < 0) {
+ dev_err(dev, "%s ccg_read failed, err %d\n", __func__, err);
+ return -EIO;
+ }
+
+ if (data[0] != CCGX_I2C_RAB_RESPONSE_REG_RESET_COMPLETE) {
+ dev_info(dev, "response (%02x %02x) != reset_complete",
+ data[0], data[1]);
+ }
+
+ /* stop UCSI */
+ err = ccg_write(ui, CCGX_I2C_RAB_UCSI_CONTROL, data, 0x1);
+ if (err < 0) {
+ dev_err(dev, "%s ccg_write failed, err %d\n", __func__, err);
+ return -EIO;
+ }
+
+ msleep(500);
+
+ /* start UCSI */
+ data[0] = CCGX_I2C_RAB_UCSI_CONTROL_START;
+ err = ccg_write(ui, CCGX_I2C_RAB_UCSI_CONTROL, data, 0x1);
+ if (err < 0) {
+ dev_err(dev, "%s ccg_write failed, err %d\n", __func__, err);
+ return -EIO;
+ }
+
+ msleep(500);
+
+ /* test read-1 */
+ err = ccg_read(ui, CCGX_I2C_RAB_UCSI_DATA_BLOCK, data, 0x2);
+ if (err < 0) {
+ dev_err(dev, "%s ccg_read failed, err %d\n", __func__, err);
+ return -EIO;
+ }
+
+ /* test read-2 */
+ err = ccg_read(ui, 0xf004, data, 0x4);
+ if (err < 0) {
+ dev_err(dev, "%s ccg_read failed, err %d\n", __func__, err);
+ return -EIO;
+ }
+
+ /* test read-3 */
+ err = ccg_read(ui, 0xf010, data, 0x10);
+ if (err < 0) {
+ dev_err(dev, "%s ccg_read failed, err %d\n", __func__, err);
+ return -EIO;
+ }
+
+ /* flush CCGx RESPONSE queue by acking interrupts
+ * - above ucsi control register write will push response
+ * which must be flushed
+ * - affects f/w update which reads response register
+ */
+ data[0] = 0xff;
+ for (i = 0; (i < 10) && (data[0] != 0x00); i++) {
+ dev_dbg(dev, "flushing response %02x\n", data[0]);
+
+ err = ccg_write(ui, CCGX_I2C_RAB_INTR_REG, data, 0x1);
+ if (err < 0) {
+ dev_err(dev, "%s ccg_write failed, err %d\n",
+ __func__, err);
+ return -EIO;
+ }
+
+ usleep_range(10000, 11000);
+
+ err = ccg_read(ui, CCGX_I2C_RAB_INTR_REG, data, 0x1);
+ if (err < 0) {
+ dev_err(dev, "%s ccg_read failed, err %d\n",
+ __func__, err);
+ return -EIO;
+ }
+ }
+
+ /* get i2c slave firmware version
+ * - [0..1] = Application name (ASCII "nb" for notebook)
+ * - [2] = external circuil specific version
+ * - [3] bit 0...3 = minor version
+ * - [3] bit 4...7 = major version
+ */
+ err = ccg_read(ui, 0x0, data, 0x4);
+ if (err < 0) {
+ dev_err(dev, "%s ccg_read failed, err %d\n", __func__, err);
+ return -EIO;
+ }
+
+ ui->ver = data[3];
+
+ dev_info(dev, "version %d.%d\n", (ui->ver >> 4) & 0x0f,
+ (ui->ver >> 0) & 0x0f);
+
+ return 0;
+}
+
+static int ucsi_i2c_ccg_send_data(struct ucsi_i2c_ccg *ui)
+{
+ int err;
+ unsigned char buf[4] = {
+ 0x20, (CCGX_I2C_RAB_UCSI_DATA_BLOCK >> 8),
+ 0x8, (CCGX_I2C_RAB_UCSI_DATA_BLOCK >> 8),
+ };
+ unsigned char buf1[16];
+ unsigned char buf2[8];
+
+ memcpy(&buf1[0], ((const void *) ui->ppm.data) + 0x20, sizeof(buf1));
+ memcpy(&buf2[0], ((const void *) ui->ppm.data) + 0x8, sizeof(buf2));
+
+ err = ccg_write(ui, *(u16 *)buf, buf1, sizeof(buf1));
+ if (err < 0) {
+ dev_err(ui->dev, "%s ccg_write failed, err %d\n",
+ __func__, err);
+ return -EIO;
+ }
+
+ err = ccg_write(ui, *(u16 *)(buf+2), buf2, sizeof(buf2));
+ if (err < 0) {
+ dev_err(ui->dev, "%s ccg_write failed, err %d\n",
+ __func__, err);
+ return -EIO;
+ }
+
+ return err;
+}
+
+static int ucsi_i2c_ccg_recv_data(struct ucsi_i2c_ccg *ui)
+{
+ static int first = 1;
+ int err;
+ unsigned char buf[6] = {
+ 0x0, (CCGX_I2C_RAB_UCSI_DATA_BLOCK >> 8),
+ 0x4, (CCGX_I2C_RAB_UCSI_DATA_BLOCK >> 8),
+ 0x10, (CCGX_I2C_RAB_UCSI_DATA_BLOCK >> 8),
+ };
+ u8 *ppm = (u8 *)ui->ppm.data;
+
+ if (first) {
+ err = ccg_read(ui, *(u16 *)buf, ppm, 0x2);
+ if (err < 0) {
+ dev_err(ui->dev, "%s ccg_read failed, err %d\n",
+ __func__, err);
+ return -EIO;
+ }
+ first = 1;
+ }
+
+ err = ccg_read(ui, *(u16 *)(buf + 2), ppm + 0x4, 0x4);
+ if (err < 0) {
+ dev_err(ui->dev, "%s ccg_read failed, err %d\n",
+ __func__, err);
+ return -EIO;
+ }
+
+ err = ccg_read(ui, *(u16 *)(buf + 4), ppm + 0x10, 0x10);
+ if (err < 0) {
+ dev_err(ui->dev, "%s ccg_read failed, err %d\n",
+ __func__, err);
+ return -EIO;
+ }
+
+ return err;
+}
+
+static int ucsi_i2c_ccg_ack_interrupt(struct ucsi_i2c_ccg *ui)
+{
+ int err;
+ unsigned char buf[3] = {(CCGX_I2C_RAB_INTR_REG & 0xff),
+ (CCGX_I2C_RAB_INTR_REG >> 8), 0x0};
+
+ err = ccg_read(ui, *(u16 *)buf, &buf[2], 0x1);
+ if (err < 0) {
+ dev_err(ui->dev, "%s ccg_read failed, err %d\n",
+ __func__, err);
+ return -EIO;
+ }
+
+ err = ccg_write(ui, *(u16 *)buf, &buf[2], 0x1);
+ if (err < 0) {
+ dev_err(ui->dev, "%s ccg_read failed, err %d\n",
+ __func__, err);
+ return -EIO;
+ }
+
+ return err;
+}
+
+static int ucsi_i2c_ccg_sync(struct ucsi_ppm *ppm)
+{
+ struct ucsi_i2c_ccg *ui = container_of(ppm,
+ struct ucsi_i2c_ccg, ppm);
+ int err;
+
+ err = ucsi_i2c_ccg_recv_data(ui);
+ if (err < 0) {
+ dev_err(ui->dev, "%s: ucsi_i2c_ccg_recv_data() err %d\n",
+ __func__, err);
+ goto exit;
+ }
+
+ /* ack interrupt to allow next command to run */
+ err = ucsi_i2c_ccg_ack_interrupt(ui);
+ if (err < 0) {
+ dev_err(ui->dev, "%s: ucsi_i2c_ccg_ack_interrupt() err %d\n",
+ __func__, err);
+ }
+exit:
+ return 0;
+}
+
+static int ucsi_i2c_ccg_cmd(struct ucsi_ppm *ppm, struct ucsi_control *ctrl)
+{
+ struct ucsi_i2c_ccg *ui = container_of(ppm,
+ struct ucsi_i2c_ccg, ppm);
+ int err = 0;
+
+ ppm->data->ctrl.raw_cmd = ctrl->raw_cmd;
+ err = ucsi_i2c_ccg_send_data(ui);
+
+ return err;
+}
+
+static irqreturn_t i2c_ccg_irq_handler(int irq, void *data)
+{
+ struct ucsi_i2c_ccg *ui = data;
+
+ dev_dbg(ui->dev, "%s irq %d data %p ui %p\n",
+ __func__, irq, data, ui);
+
+ if (!ui) {
+ dev_err(ui->dev, "%s: !ui\n", __func__);
+ return IRQ_HANDLED;
+ }
+
+ ucsi_notify(ui->ucsi);
+
+ return IRQ_HANDLED;
+}
+
+static int ucsi_i2c_ccg_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct device *dev = &client->dev;
+ struct ucsi_i2c_ccg *ui;
+ int status;
+
+ ui = devm_kzalloc(dev, sizeof(*ui), GFP_KERNEL);
+ if (!ui)
+ return -ENOMEM;
+
+ ui->ppm.data = devm_kzalloc(dev, sizeof(struct ucsi_data), GFP_KERNEL);
+ if (!ui->ppm.data)
+ return -ENOMEM;
+
+ ui->ppm.cmd = ucsi_i2c_ccg_cmd;
+ ui->ppm.sync = ucsi_i2c_ccg_sync;
+ ui->dev = dev;
+ ui->client = client;
+
+ /* reset i2c device and initialize ucsi */
+ status = ucsi_i2c_ccg_init(ui);
+ if (status < 0) {
+ dev_err(ui->dev, "%s: ucsi_i2c_ccg_init failed - %d\n",
+ __func__, status);
+ return status;
+ }
+
+ ui->irq = client->irq;
+
+ status = devm_request_threaded_irq(dev, ui->irq, NULL,
+ i2c_ccg_irq_handler, IRQF_ONESHOT | IRQF_TRIGGER_HIGH,
+ dev_name(dev), ui);
+ if (status < 0) {
+ dev_err(ui->dev, "%s: request_irq failed - %d\n",
+ __func__, status);
+ return status;
+ }
+
+ ui->ucsi = ucsi_register_ppm(dev, &ui->ppm);
+ if (IS_ERR(ui->ucsi)) {
+ dev_err(ui->dev, "ucsi_register_ppm failed\n");
+ return PTR_ERR(ui->ucsi);
+ }
+
+ i2c_set_clientdata(client, ui);
+ return 0;
+}
+
+static int ucsi_i2c_ccg_remove(struct i2c_client *client)
+{
+ struct ucsi_i2c_ccg *ui = i2c_get_clientdata(client);
+
+ ucsi_unregister_ppm(ui->ucsi);
+
+ return 0;
+}
+
+static int ucsi_i2c_ccg_suspend(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct ucsi_i2c_ccg *ui = i2c_get_clientdata(client);
+ int err;
+
+ if (device_may_wakeup(dev)) {
+ err = enable_irq_wake(ui->irq);
+ if (!err)
+ ui->wake_enabled = true;
+ }
+ return 0;
+}
+
+static int ucsi_i2c_ccg_resume(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct ucsi_i2c_ccg *ui = i2c_get_clientdata(client);
+ struct ucsi_control c;
+ int ret;
+
+ if (device_may_wakeup(dev) && ui->wake_enabled) {
+ disable_irq_wake(ui->irq);
+ ui->wake_enabled = false;
+ }
+
+ /* restore UCSI notification enable mask */
+ UCSI_CMD_SET_NTFY_ENABLE(c, UCSI_ENABLE_NTFY_ALL);
+ ret = ucsi_run_command(ui->ucsi, &c, NULL, 0);
+ if (ret) {
+ dev_err(ui->dev, "%s: failed to set notification enable - %d\n",
+ __func__, ret);
+ }
+
+ return 0;
+}
+
+UNIVERSAL_DEV_PM_OPS(ucsi_i2c_ccg_driver_pm, ucsi_i2c_ccg_suspend,
+ ucsi_i2c_ccg_resume, NULL);
+
+static const struct i2c_device_id ucsi_i2c_ccg_device_id[] = {
+ {"i2c-gpu-ucsi", 0},
+ {},
+};
+MODULE_DEVICE_TABLE(i2c, ucsi_i2c_ccg_device_id);
+
+static struct i2c_driver ucsi_i2c_ccg_driver = {
+ .driver = {
+ .name = "ucsi_i2c_ccg",
+ .pm = &ucsi_i2c_ccg_driver_pm,
+ },
+ .probe = ucsi_i2c_ccg_probe,
+ .remove = ucsi_i2c_ccg_remove,
+ .id_table = ucsi_i2c_ccg_device_id,
+};
+
+module_i2c_driver(ucsi_i2c_ccg_driver);
+
+MODULE_AUTHOR("Ajay Gupta <ajayg@xxxxxxxxxx>");
+MODULE_DESCRIPTION("UCSI I2C driver for Cypress CCGx Type-C controller");
+MODULE_LICENSE("GPL v2");
--
2.1.4
-----------------------------------------------------------------------------------
This email message is for the sole use of the intended recipient(s) and may contain
confidential information. Any unauthorized review, use, disclosure or distribution
is prohibited. If you are not the intended recipient, please contact the sender by
reply email and destroy all copies of the original message.
-----------------------------------------------------------------------------------
