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usb: typec: tcpci_maxim: Chip level TCPC driver

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Chip level TCPC driver for Maxim's TCPCI implementation.
This TCPC implementation does not support the following
commands: COMMAND.SinkVbus, COMMAND.SourceVbusDefaultVoltage,
COMMAND.SourceVbusHighVoltage. Instead the sinking and sourcing
from vbus is supported by writes to custom registers.

Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20201008061556.1402293-5-badhri@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Badhri Jagan Sridharan
2020-10-07 23:15:45 -07:00
committed by Greg Kroah-Hartman
parent b9358a0684
commit 6f413b559f
4 changed files with 476 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/usb/typec/tcpm/Kconfig
View File

@@ -35,6 +35,12 @@ config TYPEC_MT6360
USB Type-C. It works with Type-C Port Controller Manager USB Type-C. It works with Type-C Port Controller Manager
to provide USB PD and USB Type-C functionalities. to provide USB PD and USB Type-C functionalities.
config TYPEC_TCPCI_MAXIM
tristate "Maxim TCPCI based Type-C chip driver"
help
MAXIM TCPCI based Type-C/PD chip driver. Works with
with Type-C Port Controller Manager.
endif # TYPEC_TCPCI endif # TYPEC_TCPCI
config TYPEC_FUSB302 config TYPEC_FUSB302

15
drivers/usb/typec/tcpm/Makefile
View File

@@ -1,8 +1,9 @@
# SPDX-License-Identifier: GPL-2.0 # SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_TYPEC_TCPM) += tcpm.o obj-$(CONFIG_TYPEC_TCPM) += tcpm.o
obj-$(CONFIG_TYPEC_FUSB302) += fusb302.o obj-$(CONFIG_TYPEC_FUSB302) += fusb302.o
obj-$(CONFIG_TYPEC_WCOVE) += typec_wcove.o obj-$(CONFIG_TYPEC_WCOVE) += typec_wcove.o
typec_wcove-y := wcove.o typec_wcove-y := wcove.o
obj-$(CONFIG_TYPEC_TCPCI) += tcpci.o obj-$(CONFIG_TYPEC_TCPCI) += tcpci.o
obj-$(CONFIG_TYPEC_RT1711H) += tcpci_rt1711h.o obj-$(CONFIG_TYPEC_RT1711H) += tcpci_rt1711h.o
obj-$(CONFIG_TYPEC_MT6360) += tcpci_mt6360.o obj-$(CONFIG_TYPEC_MT6360) += tcpci_mt6360.o
obj-$(CONFIG_TYPEC_TCPCI_MAXIM) += tcpci_maxim.o

1
drivers/usb/typec/tcpm/tcpci.h
View File

@@ -109,6 +109,7 @@
#define TCPC_RX_BYTE_CNT 0x30 #define TCPC_RX_BYTE_CNT 0x30
#define TCPC_RX_BUF_FRAME_TYPE 0x31 #define TCPC_RX_BUF_FRAME_TYPE 0x31
#define TCPC_RX_BUF_FRAME_TYPE_SOP 0
#define TCPC_RX_HDR 0x32 #define TCPC_RX_HDR 0x32
#define TCPC_RX_DATA 0x34 /* through 0x4f */ #define TCPC_RX_DATA 0x34 /* through 0x4f */

461
drivers/usb/typec/tcpm/tcpci_maxim.c Normal file
View File

@@ -0,0 +1,461 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2020, Google LLC
*
* MAXIM TCPCI based TCPC driver
*/
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/interrupt.h>
#include <linux/i2c.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_gpio.h>
#include <linux/regmap.h>
#include <linux/usb/pd.h>
#include <linux/usb/tcpm.h>
#include <linux/usb/typec.h>
#include "tcpci.h"
#define PD_ACTIVITY_TIMEOUT_MS 10000
#define TCPC_VENDOR_ALERT 0x80
#define TCPC_RECEIVE_BUFFER_COUNT_OFFSET 0
#define TCPC_RECEIVE_BUFFER_FRAME_TYPE_OFFSET 1
#define TCPC_RECEIVE_BUFFER_RX_BYTE_BUF_OFFSET 2
/*
* LongMessage not supported, hence 32 bytes for buf to be read from RECEIVE_BUFFER.
* DEVICE_CAPABILITIES_2.LongMessage = 0, the value in READABLE_BYTE_COUNT reg shall be
* less than or equal to 31. Since, RECEIVE_BUFFER len = 31 + 1(READABLE_BYTE_COUNT).
*/
#define TCPC_RECEIVE_BUFFER_LEN 32
#define MAX_BUCK_BOOST_SID 0x69
#define MAX_BUCK_BOOST_OP 0xb9
#define MAX_BUCK_BOOST_OFF 0
#define MAX_BUCK_BOOST_SOURCE 0xa
#define MAX_BUCK_BOOST_SINK 0x5
struct max_tcpci_chip {
struct tcpci_data data;
struct tcpci *tcpci;
struct device *dev;
struct i2c_client *client;
struct tcpm_port *port;
};
static const struct regmap_range max_tcpci_tcpci_range[] = {
regmap_reg_range(0x00, 0x95)
};
const struct regmap_access_table max_tcpci_tcpci_write_table = {
.yes_ranges = max_tcpci_tcpci_range,
.n_yes_ranges = ARRAY_SIZE(max_tcpci_tcpci_range),
};
static const struct regmap_config max_tcpci_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = 0x95,
.wr_table = &max_tcpci_tcpci_write_table,
};
static struct max_tcpci_chip *tdata_to_max_tcpci(struct tcpci_data *tdata)
{
return container_of(tdata, struct max_tcpci_chip, data);
}
static int max_tcpci_read16(struct max_tcpci_chip *chip, unsigned int reg, u16 *val)
{
return regmap_raw_read(chip->data.regmap, reg, val, sizeof(u16));
}
static int max_tcpci_write16(struct max_tcpci_chip *chip, unsigned int reg, u16 val)
{
return regmap_raw_write(chip->data.regmap, reg, &val, sizeof(u16));
}
static int max_tcpci_read8(struct max_tcpci_chip *chip, unsigned int reg, u8 *val)
{
return regmap_raw_read(chip->data.regmap, reg, val, sizeof(u8));
}
static int max_tcpci_write8(struct max_tcpci_chip *chip, unsigned int reg, u8 val)
{
return regmap_raw_write(chip->data.regmap, reg, &val, sizeof(u8));
}
static void max_tcpci_init_regs(struct max_tcpci_chip *chip)
{
u16 alert_mask = 0;
int ret;
ret = max_tcpci_write16(chip, TCPC_ALERT, 0xffff);
if (ret < 0) {
dev_err(chip->dev, "Error writing to TCPC_ALERT ret:%d\n", ret);
return;
}
ret = max_tcpci_write16(chip, TCPC_VENDOR_ALERT, 0xffff);
if (ret < 0) {
dev_err(chip->dev, "Error writing to TCPC_VENDOR_ALERT ret:%d\n", ret);
return;
}
alert_mask = TCPC_ALERT_TX_SUCCESS | TCPC_ALERT_TX_DISCARDED | TCPC_ALERT_TX_FAILED |
TCPC_ALERT_RX_HARD_RST | TCPC_ALERT_RX_STATUS | TCPC_ALERT_CC_STATUS |
TCPC_ALERT_VBUS_DISCNCT | TCPC_ALERT_RX_BUF_OVF | TCPC_ALERT_POWER_STATUS;
ret = max_tcpci_write16(chip, TCPC_ALERT_MASK, alert_mask);
if (ret < 0) {
dev_err(chip->dev, "Error writing to TCPC_ALERT_MASK ret:%d\n", ret);
return;
}
/* Enable vbus voltage monitoring and voltage alerts */
ret = max_tcpci_write8(chip, TCPC_POWER_CTRL, 0);
if (ret < 0) {
dev_err(chip->dev, "Error writing to TCPC_POWER_CTRL ret:%d\n", ret);
return;
}
}
static void process_rx(struct max_tcpci_chip *chip, u16 status)
{
struct pd_message msg;
u8 count, frame_type, rx_buf[TCPC_RECEIVE_BUFFER_LEN];
int ret, payload_index;
u8 *rx_buf_ptr;
/*
* READABLE_BYTE_COUNT: Indicates the number of bytes in the RX_BUF_BYTE_x registers
* plus one (for the RX_BUF_FRAME_TYPE) Table 4-36.
* Read the count and frame type.
*/
ret = regmap_raw_read(chip->data.regmap, TCPC_RX_BYTE_CNT, rx_buf, 2);
if (ret < 0) {
dev_err(chip->dev, "TCPC_RX_BYTE_CNT read failed ret:%d", ret);
return;
}
count = rx_buf[TCPC_RECEIVE_BUFFER_COUNT_OFFSET];
frame_type = rx_buf[TCPC_RECEIVE_BUFFER_FRAME_TYPE_OFFSET];
if (count == 0 || frame_type != TCPC_RX_BUF_FRAME_TYPE_SOP) {
max_tcpci_write16(chip, TCPC_ALERT, TCPC_ALERT_RX_STATUS);
dev_err(chip->dev, "%s", count == 0 ? "error: count is 0" :
"error frame_type is not SOP");
return;
}
if (count > sizeof(struct pd_message) || count + 1 > TCPC_RECEIVE_BUFFER_LEN) {
dev_err(chip->dev, "Invalid TCPC_RX_BYTE_CNT %d", count);
return;
}
/*
* Read count + 1 as RX_BUF_BYTE_x is hidden and can only be read through
* TCPC_RX_BYTE_CNT
*/
count += 1;
ret = regmap_raw_read(chip->data.regmap, TCPC_RX_BYTE_CNT, rx_buf, count);
if (ret < 0) {
dev_err(chip->dev, "Error: TCPC_RX_BYTE_CNT read failed: %d", ret);
return;
}
rx_buf_ptr = rx_buf + TCPC_RECEIVE_BUFFER_RX_BYTE_BUF_OFFSET;
msg.header = cpu_to_le16(*(u16 *)rx_buf_ptr);
rx_buf_ptr = rx_buf_ptr + sizeof(msg.header);
for (payload_index = 0; payload_index < pd_header_cnt_le(msg.header); payload_index++,
rx_buf_ptr += sizeof(msg.payload[0]))
msg.payload[payload_index] = cpu_to_le32(*(u32 *)rx_buf_ptr);
/*
* Read complete, clear RX status alert bit.
* Clear overflow as well if set.
*/
ret = max_tcpci_write16(chip, TCPC_ALERT, status & TCPC_ALERT_RX_BUF_OVF ?
TCPC_ALERT_RX_STATUS | TCPC_ALERT_RX_BUF_OVF :
TCPC_ALERT_RX_STATUS);
if (ret < 0)
return;
tcpm_pd_receive(chip->port, &msg);
}
static int max_tcpci_set_vbus(struct tcpci *tcpci, struct tcpci_data *tdata, bool source, bool sink)
{
struct max_tcpci_chip *chip = tdata_to_max_tcpci(tdata);
u8 buffer_source[2] = {MAX_BUCK_BOOST_OP, MAX_BUCK_BOOST_SOURCE};
u8 buffer_sink[2] = {MAX_BUCK_BOOST_OP, MAX_BUCK_BOOST_SINK};
u8 buffer_none[2] = {MAX_BUCK_BOOST_OP, MAX_BUCK_BOOST_OFF};
struct i2c_client *i2c = chip->client;
int ret;
struct i2c_msg msgs[] = {
{
.addr = MAX_BUCK_BOOST_SID,
.flags = i2c->flags & I2C_M_TEN,
.len = 2,
.buf = source ? buffer_source : sink ? buffer_sink : buffer_none,
},
};
if (source && sink) {
dev_err(chip->dev, "Both source and sink set\n");
return -EINVAL;
}
ret = i2c_transfer(i2c->adapter, msgs, 1);
return ret < 0 ? ret : 1;
}
static void process_power_status(struct max_tcpci_chip *chip)
{
u8 pwr_status;
int ret;
ret = max_tcpci_read8(chip, TCPC_POWER_STATUS, &pwr_status);
if (ret < 0)
return;
if (pwr_status == 0xff)
max_tcpci_init_regs(chip);
else
tcpm_vbus_change(chip->port);
}
static void process_tx(struct max_tcpci_chip *chip, u16 status)
{
if (status & TCPC_ALERT_TX_SUCCESS)
tcpm_pd_transmit_complete(chip->port, TCPC_TX_SUCCESS);
else if (status & TCPC_ALERT_TX_DISCARDED)
tcpm_pd_transmit_complete(chip->port, TCPC_TX_DISCARDED);
else if (status & TCPC_ALERT_TX_FAILED)
tcpm_pd_transmit_complete(chip->port, TCPC_TX_FAILED);
/* Reinit regs as Hard reset sets them to default value */
if ((status & TCPC_ALERT_TX_SUCCESS) && (status & TCPC_ALERT_TX_FAILED))
max_tcpci_init_regs(chip);
}
static irqreturn_t _max_tcpci_irq(struct max_tcpci_chip *chip, u16 status)
{
u16 mask;
int ret;
/*
* Clear alert status for everything except RX_STATUS, which shouldn't
* be cleared until we have successfully retrieved message.
*/
if (status & ~TCPC_ALERT_RX_STATUS) {
mask = status & TCPC_ALERT_RX_BUF_OVF ?
status & ~(TCPC_ALERT_RX_STATUS | TCPC_ALERT_RX_BUF_OVF) :
status & ~TCPC_ALERT_RX_STATUS;
ret = max_tcpci_write16(chip, TCPC_ALERT, mask);
if (ret < 0) {
dev_err(chip->dev, "ALERT clear failed\n");
return ret;
}
}
if (status & TCPC_ALERT_RX_BUF_OVF && !(status & TCPC_ALERT_RX_STATUS)) {
ret = max_tcpci_write16(chip, TCPC_ALERT, (TCPC_ALERT_RX_STATUS |
TCPC_ALERT_RX_BUF_OVF));
if (ret < 0) {
dev_err(chip->dev, "ALERT clear failed\n");
return ret;
}
}
if (status & TCPC_ALERT_RX_STATUS)
process_rx(chip, status);
if (status & TCPC_ALERT_VBUS_DISCNCT)
tcpm_vbus_change(chip->port);
if (status & TCPC_ALERT_CC_STATUS)
tcpm_cc_change(chip->port);
if (status & TCPC_ALERT_POWER_STATUS)
process_power_status(chip);
if (status & TCPC_ALERT_RX_HARD_RST) {
tcpm_pd_hard_reset(chip->port);
max_tcpci_init_regs(chip);
}
if (status & TCPC_ALERT_TX_SUCCESS || status & TCPC_ALERT_TX_DISCARDED || status &
TCPC_ALERT_TX_FAILED)
process_tx(chip, status);
return IRQ_HANDLED;
}
static irqreturn_t max_tcpci_irq(int irq, void *dev_id)
{
struct max_tcpci_chip *chip = dev_id;
u16 status;
irqreturn_t irq_return;
int ret;
if (!chip->port)
return IRQ_HANDLED;
ret = max_tcpci_read16(chip, TCPC_ALERT, &status);
if (ret < 0) {
dev_err(chip->dev, "ALERT read failed\n");
return ret;
}
while (status) {
irq_return = _max_tcpci_irq(chip, status);
/* Do not return if the ALERT is already set. */
ret = max_tcpci_read16(chip, TCPC_ALERT, &status);
if (ret < 0)
break;
}
return irq_return;
}
static irqreturn_t max_tcpci_isr(int irq, void *dev_id)
{
struct max_tcpci_chip *chip = dev_id;
pm_wakeup_event(chip->dev, PD_ACTIVITY_TIMEOUT_MS);
if (!chip->port)
return IRQ_HANDLED;
return IRQ_WAKE_THREAD;
}
static int max_tcpci_init_alert(struct max_tcpci_chip *chip, struct i2c_client *client)
{
int ret;
ret = devm_request_threaded_irq(chip->dev, client->irq, max_tcpci_isr, max_tcpci_irq,
(IRQF_TRIGGER_LOW | IRQF_ONESHOT), dev_name(chip->dev),
chip);
if (ret < 0)
return ret;
enable_irq_wake(client->irq);
return 0;
}
static int max_tcpci_start_toggling(struct tcpci *tcpci, struct tcpci_data *tdata,
enum typec_cc_status cc)
{
struct max_tcpci_chip *chip = tdata_to_max_tcpci(tdata);
max_tcpci_init_regs(chip);
return 0;
}
static int tcpci_init(struct tcpci *tcpci, struct tcpci_data *data)
{
/*
* Generic TCPCI overwrites the regs once this driver initializes
* them. Prevent this by returning -1.
*/
return -1;
}
static int max_tcpci_probe(struct i2c_client *client, const struct i2c_device_id *i2c_id)
{
int ret;
struct max_tcpci_chip *chip;
u8 power_status;
chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
if (!chip)
return -ENOMEM;
chip->client = client;
chip->data.regmap = devm_regmap_init_i2c(client, &max_tcpci_regmap_config);
if (IS_ERR(chip->data.regmap)) {
dev_err(&client->dev, "Regmap init failed\n");
return PTR_ERR(chip->data.regmap);
}
chip->dev = &client->dev;
i2c_set_clientdata(client, chip);
ret = max_tcpci_read8(chip, TCPC_POWER_STATUS, &power_status);
if (ret < 0)
return ret;
/* Chip level tcpci callbacks */
chip->data.set_vbus = max_tcpci_set_vbus;
chip->data.start_drp_toggling = max_tcpci_start_toggling;
chip->data.TX_BUF_BYTE_x_hidden = true;
chip->data.init = tcpci_init;
max_tcpci_init_regs(chip);
chip->tcpci = tcpci_register_port(chip->dev, &chip->data);
if (IS_ERR_OR_NULL(chip->tcpci)) {
dev_err(&client->dev, "TCPCI port registration failed");
ret = PTR_ERR(chip->tcpci);
return PTR_ERR(chip->tcpci);
}
chip->port = tcpci_get_tcpm_port(chip->tcpci);
ret = max_tcpci_init_alert(chip, client);
if (ret < 0)
goto unreg_port;
device_init_wakeup(chip->dev, true);
return 0;
unreg_port:
tcpci_unregister_port(chip->tcpci);
return ret;
}
static int max_tcpci_remove(struct i2c_client *client)
{
struct max_tcpci_chip *chip = i2c_get_clientdata(client);
if (!IS_ERR_OR_NULL(chip->tcpci))
tcpci_unregister_port(chip->tcpci);
return 0;
}
static const struct i2c_device_id max_tcpci_id[] = {
{ "maxtcpc", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, max_tcpci_id);
#ifdef CONFIG_OF
static const struct of_device_id max_tcpci_of_match[] = {
{ .compatible = "maxim,tcpc", },
{},
};
MODULE_DEVICE_TABLE(of, max_tcpci_of_match);
#endif
static struct i2c_driver max_tcpci_i2c_driver = {
.driver = {
.name = "maxtcpc",
.of_match_table = of_match_ptr(max_tcpci_of_match),
},
.probe = max_tcpci_probe,
.remove = max_tcpci_remove,
.id_table = max_tcpci_id,
};
module_i2c_driver(max_tcpci_i2c_driver);
MODULE_AUTHOR("Badhri Jagan Sridharan <badhri@google.com>");
MODULE_DESCRIPTION("Maxim TCPCI based USB Type-C Port Controller Interface Driver");
MODULE_LICENSE("GPL v2");