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Subject[PATCH v2] staging: typec: rt1711h typec chip driver
Date
From: ShuFan Lee <shufan_lee@richtek.com>

Richtek RT1711H Type-C chip driver that works with
Type-C Port Controller Manager to provide USB PD and
USB Type-C functionalities.
Add definition of TCPC_CC_STATUS_TOGGLING.

Signed-off-by: ShuFan Lee <shufan_lee@richtek.com>
---
drivers/staging/typec/Kconfig | 8 +
drivers/staging/typec/Makefile | 1 +
drivers/staging/typec/tcpci.h | 1 +
drivers/staging/typec/tcpci_rt1711h.c | 329 ++++++++++++++++++++++++++++++++++
4 files changed, 339 insertions(+)
create mode 100644 drivers/staging/typec/tcpci_rt1711h.c

changelogs between v1 and v2
- use gpiod_* instead of gpio_*

diff --git a/drivers/staging/typec/Kconfig b/drivers/staging/typec/Kconfig
index 5359f556d203..3aa981fbc8f5 100644
--- a/drivers/staging/typec/Kconfig
+++ b/drivers/staging/typec/Kconfig
@@ -9,6 +9,14 @@ config TYPEC_TCPCI
help
Type-C Port Controller driver for TCPCI-compliant controller.

+config TYPEC_RT1711H
+ tristate "Richtek RT1711H Type-C chip driver"
+ select TYPEC_TCPCI
+ help
+ Richtek RT1711H Type-C chip driver that works with
+ Type-C Port Controller Manager to provide USB PD and USB
+ Type-C functionalities.
+
endif

endmenu
diff --git a/drivers/staging/typec/Makefile b/drivers/staging/typec/Makefile
index 53d649abcb53..7803d485e1b3 100644
--- a/drivers/staging/typec/Makefile
+++ b/drivers/staging/typec/Makefile
@@ -1 +1,2 @@
obj-$(CONFIG_TYPEC_TCPCI) += tcpci.o
+obj-$(CONFIG_TYPEC_RT1711H) += tcpci_rt1711h.o
diff --git a/drivers/staging/typec/tcpci.h b/drivers/staging/typec/tcpci.h
index 34c865f0dcf6..303ebde26546 100644
--- a/drivers/staging/typec/tcpci.h
+++ b/drivers/staging/typec/tcpci.h
@@ -59,6 +59,7 @@
#define TCPC_POWER_CTRL_VCONN_ENABLE BIT(0)

#define TCPC_CC_STATUS 0x1d
+#define TCPC_CC_STATUS_TOGGLING BIT(5)
#define TCPC_CC_STATUS_TERM BIT(4)
#define TCPC_CC_STATUS_CC2_SHIFT 2
#define TCPC_CC_STATUS_CC2_MASK 0x3
diff --git a/drivers/staging/typec/tcpci_rt1711h.c b/drivers/staging/typec/tcpci_rt1711h.c
new file mode 100644
index 000000000000..12afac363d6d
--- /dev/null
+++ b/drivers/staging/typec/tcpci_rt1711h.c
@@ -0,0 +1,329 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018, Richtek Technology Corporation
+ *
+ * Richtek RT1711H Type-C Chip Driver
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/gpio/consumer.h>
+#include <linux/usb/tcpm.h>
+#include <linux/regmap.h>
+#include "tcpci.h"
+
+#define RT1711H_RTCTRL8 0x9B
+
+/* Autoidle timeout = (tout * 2 + 1) * 6.4ms */
+#define RT1711H_RTCTRL8_SET(ck300, ship_off, auto_idle, tout) \
+ (((ck300) << 7) | ((ship_off) << 5) | \
+ ((auto_idle) << 3) | ((tout) & 0x07))
+
+#define RT1711H_RTCTRL11 0x9E
+
+/* I2C timeout = (tout + 1) * 12.5ms */
+#define RT1711H_RTCTRL11_SET(en, tout) \
+ (((en) << 7) | ((tout) & 0x0F))
+
+#define RT1711H_RTCTRL13 0xA0
+#define RT1711H_RTCTRL14 0xA1
+#define RT1711H_RTCTRL15 0xA2
+#define RT1711H_RTCTRL16 0xA3
+
+struct rt1711h_chip {
+ struct tcpci_data data;
+ struct tcpci *tcpci;
+ struct device *dev;
+ int irq;
+};
+
+static int rt1711h_read16(struct rt1711h_chip *chip, unsigned int reg, u16 *val)
+{
+ return regmap_raw_read(chip->data.regmap, reg, val, sizeof(u16));
+}
+
+static int rt1711h_write16(struct rt1711h_chip *chip, unsigned int reg, u16 val)
+{
+ return regmap_raw_write(chip->data.regmap, reg, &val, sizeof(u16));
+}
+
+static int rt1711h_read8(struct rt1711h_chip *chip, unsigned int reg, u8 *val)
+{
+ return regmap_raw_read(chip->data.regmap, reg, val, sizeof(u8));
+}
+
+static int rt1711h_write8(struct rt1711h_chip *chip, unsigned int reg, u8 val)
+{
+ return regmap_raw_write(chip->data.regmap, reg, &val, sizeof(u8));
+}
+
+static const struct regmap_config rt1711h_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+
+ .max_register = 0xFF, /* 0x80 .. 0xFF are vendor defined */
+};
+
+static struct rt1711h_chip *tdata_to_rt1711h(struct tcpci_data *tdata)
+{
+ return container_of(tdata, struct rt1711h_chip, data);
+}
+
+static int rt1711h_init(struct tcpci *tcpci, struct tcpci_data *tdata)
+{
+ int ret;
+ struct rt1711h_chip *chip = tdata_to_rt1711h(tdata);
+
+ /* CK 300K from 320K, shipping off, auto_idle enable, tout = 32ms */
+ ret = rt1711h_write8(chip, RT1711H_RTCTRL8,
+ RT1711H_RTCTRL8_SET(0, 1, 1, 2));
+ if (ret < 0)
+ return ret;
+
+ /* I2C reset : (val + 1) * 12.5ms */
+ ret = rt1711h_write8(chip, RT1711H_RTCTRL11,
+ RT1711H_RTCTRL11_SET(1, 0x0F));
+ if (ret < 0)
+ return ret;
+
+ /* tTCPCfilter : (26.7 * val) us */
+ ret = rt1711h_write8(chip, RT1711H_RTCTRL14, 0x0F);
+ if (ret < 0)
+ return ret;
+
+ /* tDRP : (51.2 + 6.4 * val) ms */
+ ret = rt1711h_write8(chip, RT1711H_RTCTRL15, 0x04);
+ if (ret < 0)
+ return ret;
+
+ /* dcSRC.DRP : 33% */
+ return rt1711h_write16(chip, RT1711H_RTCTRL16, 330);
+}
+
+static int rt1711h_set_vconn(struct tcpci *tcpci, struct tcpci_data *tdata,
+ bool enable)
+{
+ struct rt1711h_chip *chip = tdata_to_rt1711h(tdata);
+
+ return rt1711h_write8(chip, RT1711H_RTCTRL8,
+ RT1711H_RTCTRL8_SET(0, 1, enable ? 0 : 1, 2));
+}
+
+static int rt1711h_start_drp_toggling(struct tcpci *tcpci,
+ struct tcpci_data *tdata,
+ enum typec_cc_status cc)
+{
+ struct rt1711h_chip *chip = tdata_to_rt1711h(tdata);
+ int ret;
+ unsigned int reg = 0;
+
+ switch (cc) {
+ default:
+ case TYPEC_CC_RP_DEF:
+ reg |= (TCPC_ROLE_CTRL_RP_VAL_DEF <<
+ TCPC_ROLE_CTRL_RP_VAL_SHIFT);
+ break;
+ case TYPEC_CC_RP_1_5:
+ reg |= (TCPC_ROLE_CTRL_RP_VAL_1_5 <<
+ TCPC_ROLE_CTRL_RP_VAL_SHIFT);
+ break;
+ case TYPEC_CC_RP_3_0:
+ reg |= (TCPC_ROLE_CTRL_RP_VAL_3_0 <<
+ TCPC_ROLE_CTRL_RP_VAL_SHIFT);
+ break;
+ }
+
+ if (cc == TYPEC_CC_RD)
+ reg |= (TCPC_ROLE_CTRL_CC_RD << TCPC_ROLE_CTRL_CC1_SHIFT) |
+ (TCPC_ROLE_CTRL_CC_RD << TCPC_ROLE_CTRL_CC2_SHIFT);
+ else
+ reg |= (TCPC_ROLE_CTRL_CC_RP << TCPC_ROLE_CTRL_CC1_SHIFT) |
+ (TCPC_ROLE_CTRL_CC_RP << TCPC_ROLE_CTRL_CC2_SHIFT);
+
+ ret = rt1711h_write8(chip, TCPC_ROLE_CTRL, reg);
+ if (ret < 0)
+ return ret;
+ usleep_range(500, 1000);
+
+ return 0;
+}
+
+static irqreturn_t rt1711h_irq(int irq, void *dev_id)
+{
+ int ret;
+ u16 alert;
+ u8 status;
+ struct rt1711h_chip *chip = dev_id;
+
+ if (!chip->tcpci)
+ return IRQ_HANDLED;
+
+ ret = rt1711h_read16(chip, TCPC_ALERT, &alert);
+ if (ret < 0)
+ goto out;
+
+ if (alert & TCPC_ALERT_CC_STATUS) {
+ ret = rt1711h_read8(chip, TCPC_CC_STATUS, &status);
+ if (ret < 0)
+ goto out;
+ /* Clear cc change event triggered by starting toggling */
+ if (status & TCPC_CC_STATUS_TOGGLING)
+ rt1711h_write8(chip, TCPC_ALERT, TCPC_ALERT_CC_STATUS);
+ }
+
+out:
+ return tcpci_irq(chip->tcpci);
+}
+
+static int rt1711h_init_gpio(struct rt1711h_chip *chip)
+{
+ struct gpio_desc *gpio;
+
+ gpio = devm_gpiod_get(chip->dev, "rt,intr", GPIOD_IN);
+ if (IS_ERR(gpio))
+ return PTR_ERR(gpio);
+
+ chip->irq = gpiod_to_irq(gpio);
+ if (chip->irq < 0)
+ return chip->irq;
+ return 0;
+}
+
+static int rt1711h_init_alert(struct rt1711h_chip *chip)
+{
+ int ret;
+
+ /* Disable chip interrupts before requesting irq */
+ ret = rt1711h_write16(chip, TCPC_ALERT_MASK, 0);
+ if (ret < 0)
+ return ret;
+
+ if (!chip->irq) {
+ ret = rt1711h_init_gpio(chip);
+ if (ret < 0)
+ return ret;
+ }
+ ret = devm_request_threaded_irq(chip->dev, chip->irq, NULL,
+ rt1711h_irq,
+ IRQF_ONESHOT | IRQF_TRIGGER_LOW,
+ dev_name(chip->dev), chip);
+ if (ret < 0)
+ return ret;
+ enable_irq_wake(chip->irq);
+ return 0;
+}
+
+static int rt1711h_sw_reset(struct rt1711h_chip *chip)
+{
+ int ret;
+
+ ret = rt1711h_write8(chip, RT1711H_RTCTRL13, 0x01);
+ if (ret < 0)
+ return ret;
+
+ usleep_range(1000, 2000);
+ return 0;
+}
+
+static int rt1711h_check_revision(struct i2c_client *i2c)
+{
+ int ret;
+
+ ret = i2c_smbus_read_word_data(i2c, TCPC_VENDOR_ID);
+ if (ret < 0)
+ return ret;
+ if (ret != 0x29cf) {
+ dev_err(&i2c->dev, "vid is not correct, 0x%04x\n", ret);
+ return -ENODEV;
+ }
+ ret = i2c_smbus_read_word_data(i2c, TCPC_PRODUCT_ID);
+ if (ret < 0)
+ return ret;
+ if (ret != 0x1711) {
+ dev_err(&i2c->dev, "pid is not correct, 0x%04x\n", ret);
+ return -ENODEV;
+ }
+ return 0;
+}
+
+static int rt1711h_probe(struct i2c_client *client,
+ const struct i2c_device_id *i2c_id)
+{
+ int ret;
+ struct rt1711h_chip *chip;
+
+ ret = rt1711h_check_revision(client);
+ if (ret < 0) {
+ dev_err(&client->dev, "check vid/pid fail\n");
+ return ret;
+ }
+
+ chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
+ if (!chip)
+ return -ENOMEM;
+
+ chip->data.regmap = devm_regmap_init_i2c(client,
+ &rt1711h_regmap_config);
+ if (IS_ERR(chip->data.regmap))
+ return PTR_ERR(chip->data.regmap);
+
+ chip->irq = client->irq;
+ chip->dev = &client->dev;
+ i2c_set_clientdata(client, chip);
+
+ ret = rt1711h_sw_reset(chip);
+ if (ret < 0)
+ return ret;
+
+ ret = rt1711h_init_alert(chip);
+ if (ret < 0)
+ return ret;
+
+ chip->data.init = rt1711h_init;
+ chip->data.set_vconn = rt1711h_set_vconn;
+ chip->data.start_drp_toggling = rt1711h_start_drp_toggling;
+ chip->tcpci = tcpci_register_port(chip->dev, &chip->data);
+ if (IS_ERR_OR_NULL(chip->tcpci))
+ return PTR_ERR(chip->tcpci);
+
+ return 0;
+}
+
+static int rt1711h_remove(struct i2c_client *client)
+{
+ struct rt1711h_chip *chip = i2c_get_clientdata(client);
+
+ tcpci_unregister_port(chip->tcpci);
+ return 0;
+}
+
+static const struct i2c_device_id rt1711h_id[] = {
+ { "rt1711h", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, rt1711h_id);
+
+#ifdef CONFIG_OF
+static const struct of_device_id rt1711h_of_match[] = {
+ { .compatible = "richtek,rt1711h", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, rt1711h_of_match);
+#endif
+
+static struct i2c_driver rt1711h_i2c_driver = {
+ .driver = {
+ .name = "rt1711h",
+ .of_match_table = of_match_ptr(rt1711h_of_match),
+ },
+ .probe = rt1711h_probe,
+ .remove = rt1711h_remove,
+ .id_table = rt1711h_id,
+};
+module_i2c_driver(rt1711h_i2c_driver);
+
+MODULE_AUTHOR("ShuFan Lee <shufan_lee@richtek.com>");
+MODULE_DESCRIPTION("RT1711H USB Type-C Port Controller Interface Driver");
+MODULE_LICENSE("GPL");
--
1.9.1
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