514 lines
13 KiB
C
514 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* drivers/extcon/extcon-tusb320.c - TUSB320 extcon driver
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*
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* Copyright (C) 2020 National Instruments Corporation
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* Author: Michael Auchter <michael.auchter@ni.com>
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*/
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#include <linux/bitfield.h>
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#include <linux/extcon-provider.h>
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#include <linux/i2c.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/regmap.h>
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#include <linux/usb/typec.h>
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#define TUSB320_REG8 0x8
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#define TUSB320_REG8_CURRENT_MODE_ADVERTISE GENMASK(7, 6)
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#define TUSB320_REG8_CURRENT_MODE_ADVERTISE_USB 0x0
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#define TUSB320_REG8_CURRENT_MODE_ADVERTISE_15A 0x1
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#define TUSB320_REG8_CURRENT_MODE_ADVERTISE_30A 0x2
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#define TUSB320_REG8_CURRENT_MODE_DETECT GENMASK(5, 4)
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#define TUSB320_REG8_CURRENT_MODE_DETECT_DEF 0x0
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#define TUSB320_REG8_CURRENT_MODE_DETECT_MED 0x1
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#define TUSB320_REG8_CURRENT_MODE_DETECT_ACC 0x2
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#define TUSB320_REG8_CURRENT_MODE_DETECT_HI 0x3
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#define TUSB320_REG8_ACCESSORY_CONNECTED GENMASK(3, 2)
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#define TUSB320_REG8_ACCESSORY_CONNECTED_NONE 0x0
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#define TUSB320_REG8_ACCESSORY_CONNECTED_AUDIO 0x4
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#define TUSB320_REG8_ACCESSORY_CONNECTED_ACC 0x5
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#define TUSB320_REG8_ACCESSORY_CONNECTED_DEBUG 0x6
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#define TUSB320_REG8_ACTIVE_CABLE_DETECTION BIT(0)
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#define TUSB320_REG9 0x9
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#define TUSB320_REG9_ATTACHED_STATE_SHIFT 6
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#define TUSB320_REG9_ATTACHED_STATE_MASK 0x3
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#define TUSB320_REG9_CABLE_DIRECTION BIT(5)
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#define TUSB320_REG9_INTERRUPT_STATUS BIT(4)
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#define TUSB320_REGA 0xa
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#define TUSB320L_REGA_DISABLE_TERM BIT(0)
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#define TUSB320_REGA_I2C_SOFT_RESET BIT(3)
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#define TUSB320_REGA_MODE_SELECT_SHIFT 4
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#define TUSB320_REGA_MODE_SELECT_MASK 0x3
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#define TUSB320L_REGA0_REVISION 0xa0
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enum tusb320_attached_state {
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TUSB320_ATTACHED_STATE_NONE,
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TUSB320_ATTACHED_STATE_DFP,
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TUSB320_ATTACHED_STATE_UFP,
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TUSB320_ATTACHED_STATE_ACC,
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};
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enum tusb320_mode {
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TUSB320_MODE_PORT,
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TUSB320_MODE_UFP,
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TUSB320_MODE_DFP,
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TUSB320_MODE_DRP,
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};
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struct tusb320_priv;
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struct tusb320_ops {
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int (*set_mode)(struct tusb320_priv *priv, enum tusb320_mode mode);
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int (*get_revision)(struct tusb320_priv *priv, unsigned int *revision);
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};
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struct tusb320_priv {
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struct device *dev;
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struct regmap *regmap;
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struct extcon_dev *edev;
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struct tusb320_ops *ops;
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enum tusb320_attached_state state;
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struct typec_port *port;
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struct typec_capability cap;
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enum typec_port_type port_type;
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enum typec_pwr_opmode pwr_opmode;
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};
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static const char * const tusb_attached_states[] = {
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[TUSB320_ATTACHED_STATE_NONE] = "not attached",
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[TUSB320_ATTACHED_STATE_DFP] = "downstream facing port",
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[TUSB320_ATTACHED_STATE_UFP] = "upstream facing port",
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[TUSB320_ATTACHED_STATE_ACC] = "accessory",
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};
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static const unsigned int tusb320_extcon_cable[] = {
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EXTCON_USB,
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EXTCON_USB_HOST,
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EXTCON_NONE,
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};
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static int tusb320_check_signature(struct tusb320_priv *priv)
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{
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static const char sig[] = { '\0', 'T', 'U', 'S', 'B', '3', '2', '0' };
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unsigned val;
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int i, ret;
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for (i = 0; i < sizeof(sig); i++) {
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ret = regmap_read(priv->regmap, sizeof(sig) - 1 - i, &val);
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if (ret < 0)
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return ret;
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if (val != sig[i]) {
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dev_err(priv->dev, "signature mismatch!\n");
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return -ENODEV;
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}
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}
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return 0;
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}
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static int tusb320_set_mode(struct tusb320_priv *priv, enum tusb320_mode mode)
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{
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int ret;
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/* Mode cannot be changed while cable is attached */
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if (priv->state != TUSB320_ATTACHED_STATE_NONE)
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return -EBUSY;
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/* Write mode */
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ret = regmap_write_bits(priv->regmap, TUSB320_REGA,
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TUSB320_REGA_MODE_SELECT_MASK << TUSB320_REGA_MODE_SELECT_SHIFT,
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mode << TUSB320_REGA_MODE_SELECT_SHIFT);
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if (ret) {
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dev_err(priv->dev, "failed to write mode: %d\n", ret);
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return ret;
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}
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return 0;
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}
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static int tusb320l_set_mode(struct tusb320_priv *priv, enum tusb320_mode mode)
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{
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int ret;
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/* Disable CC state machine */
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ret = regmap_write_bits(priv->regmap, TUSB320_REGA,
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TUSB320L_REGA_DISABLE_TERM, 1);
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if (ret) {
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dev_err(priv->dev,
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"failed to disable CC state machine: %d\n", ret);
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return ret;
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}
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/* Write mode */
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ret = regmap_write_bits(priv->regmap, TUSB320_REGA,
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TUSB320_REGA_MODE_SELECT_MASK << TUSB320_REGA_MODE_SELECT_SHIFT,
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mode << TUSB320_REGA_MODE_SELECT_SHIFT);
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if (ret) {
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dev_err(priv->dev, "failed to write mode: %d\n", ret);
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goto err;
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}
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msleep(5);
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err:
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/* Re-enable CC state machine */
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ret = regmap_write_bits(priv->regmap, TUSB320_REGA,
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TUSB320L_REGA_DISABLE_TERM, 0);
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if (ret)
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dev_err(priv->dev,
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"failed to re-enable CC state machine: %d\n", ret);
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return ret;
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}
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static int tusb320_reset(struct tusb320_priv *priv)
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{
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int ret;
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/* Set mode to default (follow PORT pin) */
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ret = priv->ops->set_mode(priv, TUSB320_MODE_PORT);
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if (ret && ret != -EBUSY) {
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dev_err(priv->dev,
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"failed to set mode to PORT: %d\n", ret);
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return ret;
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}
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/* Perform soft reset */
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ret = regmap_write_bits(priv->regmap, TUSB320_REGA,
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TUSB320_REGA_I2C_SOFT_RESET, 1);
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if (ret) {
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dev_err(priv->dev,
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"failed to write soft reset bit: %d\n", ret);
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return ret;
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}
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/* Wait for chip to go through reset */
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msleep(95);
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return 0;
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}
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static int tusb320l_get_revision(struct tusb320_priv *priv, unsigned int *revision)
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{
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return regmap_read(priv->regmap, TUSB320L_REGA0_REVISION, revision);
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}
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static struct tusb320_ops tusb320_ops = {
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.set_mode = tusb320_set_mode,
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};
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static struct tusb320_ops tusb320l_ops = {
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.set_mode = tusb320l_set_mode,
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.get_revision = tusb320l_get_revision,
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};
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static int tusb320_set_adv_pwr_mode(struct tusb320_priv *priv)
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{
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u8 mode;
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if (priv->pwr_opmode == TYPEC_PWR_MODE_USB)
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mode = TUSB320_REG8_CURRENT_MODE_ADVERTISE_USB;
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else if (priv->pwr_opmode == TYPEC_PWR_MODE_1_5A)
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mode = TUSB320_REG8_CURRENT_MODE_ADVERTISE_15A;
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else if (priv->pwr_opmode == TYPEC_PWR_MODE_3_0A)
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mode = TUSB320_REG8_CURRENT_MODE_ADVERTISE_30A;
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else /* No other mode is supported. */
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return -EINVAL;
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return regmap_write_bits(priv->regmap, TUSB320_REG8,
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TUSB320_REG8_CURRENT_MODE_ADVERTISE,
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FIELD_PREP(TUSB320_REG8_CURRENT_MODE_ADVERTISE,
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mode));
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}
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static int tusb320_port_type_set(struct typec_port *port,
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enum typec_port_type type)
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{
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struct tusb320_priv *priv = typec_get_drvdata(port);
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if (type == TYPEC_PORT_SRC)
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return priv->ops->set_mode(priv, TUSB320_MODE_DFP);
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else if (type == TYPEC_PORT_SNK)
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return priv->ops->set_mode(priv, TUSB320_MODE_UFP);
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else if (type == TYPEC_PORT_DRP)
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return priv->ops->set_mode(priv, TUSB320_MODE_DRP);
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else
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return priv->ops->set_mode(priv, TUSB320_MODE_PORT);
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}
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static const struct typec_operations tusb320_typec_ops = {
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.port_type_set = tusb320_port_type_set,
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};
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static void tusb320_extcon_irq_handler(struct tusb320_priv *priv, u8 reg)
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{
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int state, polarity;
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state = (reg >> TUSB320_REG9_ATTACHED_STATE_SHIFT) &
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TUSB320_REG9_ATTACHED_STATE_MASK;
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polarity = !!(reg & TUSB320_REG9_CABLE_DIRECTION);
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dev_dbg(priv->dev, "attached state: %s, polarity: %d\n",
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tusb_attached_states[state], polarity);
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extcon_set_state(priv->edev, EXTCON_USB,
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state == TUSB320_ATTACHED_STATE_UFP);
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extcon_set_state(priv->edev, EXTCON_USB_HOST,
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state == TUSB320_ATTACHED_STATE_DFP);
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extcon_set_property(priv->edev, EXTCON_USB,
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EXTCON_PROP_USB_TYPEC_POLARITY,
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(union extcon_property_value)polarity);
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extcon_set_property(priv->edev, EXTCON_USB_HOST,
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EXTCON_PROP_USB_TYPEC_POLARITY,
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(union extcon_property_value)polarity);
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extcon_sync(priv->edev, EXTCON_USB);
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extcon_sync(priv->edev, EXTCON_USB_HOST);
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priv->state = state;
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}
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static void tusb320_typec_irq_handler(struct tusb320_priv *priv, u8 reg9)
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{
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struct typec_port *port = priv->port;
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struct device *dev = priv->dev;
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u8 mode, role, state;
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int ret, reg8;
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bool ori;
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ori = reg9 & TUSB320_REG9_CABLE_DIRECTION;
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typec_set_orientation(port, ori ? TYPEC_ORIENTATION_REVERSE :
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TYPEC_ORIENTATION_NORMAL);
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state = (reg9 >> TUSB320_REG9_ATTACHED_STATE_SHIFT) &
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TUSB320_REG9_ATTACHED_STATE_MASK;
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if (state == TUSB320_ATTACHED_STATE_DFP)
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role = TYPEC_SOURCE;
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else
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role = TYPEC_SINK;
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typec_set_vconn_role(port, role);
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typec_set_pwr_role(port, role);
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typec_set_data_role(port, role == TYPEC_SOURCE ?
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TYPEC_HOST : TYPEC_DEVICE);
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ret = regmap_read(priv->regmap, TUSB320_REG8, ®8);
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if (ret) {
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dev_err(dev, "error during reg8 i2c read, ret=%d!\n", ret);
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return;
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}
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mode = FIELD_GET(TUSB320_REG8_CURRENT_MODE_DETECT, reg8);
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if (mode == TUSB320_REG8_CURRENT_MODE_DETECT_DEF)
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typec_set_pwr_opmode(port, TYPEC_PWR_MODE_USB);
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else if (mode == TUSB320_REG8_CURRENT_MODE_DETECT_MED)
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typec_set_pwr_opmode(port, TYPEC_PWR_MODE_1_5A);
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else if (mode == TUSB320_REG8_CURRENT_MODE_DETECT_HI)
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typec_set_pwr_opmode(port, TYPEC_PWR_MODE_3_0A);
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else /* Charge through accessory */
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typec_set_pwr_opmode(port, TYPEC_PWR_MODE_USB);
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}
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static irqreturn_t tusb320_irq_handler(int irq, void *dev_id)
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{
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struct tusb320_priv *priv = dev_id;
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unsigned int reg;
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if (regmap_read(priv->regmap, TUSB320_REG9, ®)) {
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dev_err(priv->dev, "error during i2c read!\n");
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return IRQ_NONE;
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}
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if (!(reg & TUSB320_REG9_INTERRUPT_STATUS))
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return IRQ_NONE;
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tusb320_extcon_irq_handler(priv, reg);
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tusb320_typec_irq_handler(priv, reg);
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regmap_write(priv->regmap, TUSB320_REG9, reg);
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return IRQ_HANDLED;
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}
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static const struct regmap_config tusb320_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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};
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static int tusb320_extcon_probe(struct tusb320_priv *priv)
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{
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int ret;
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priv->edev = devm_extcon_dev_allocate(priv->dev, tusb320_extcon_cable);
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if (IS_ERR(priv->edev)) {
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dev_err(priv->dev, "failed to allocate extcon device\n");
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return PTR_ERR(priv->edev);
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}
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ret = devm_extcon_dev_register(priv->dev, priv->edev);
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if (ret < 0) {
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dev_err(priv->dev, "failed to register extcon device\n");
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return ret;
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}
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extcon_set_property_capability(priv->edev, EXTCON_USB,
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EXTCON_PROP_USB_TYPEC_POLARITY);
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extcon_set_property_capability(priv->edev, EXTCON_USB_HOST,
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EXTCON_PROP_USB_TYPEC_POLARITY);
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return 0;
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}
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static int tusb320_typec_probe(struct i2c_client *client,
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struct tusb320_priv *priv)
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{
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struct fwnode_handle *connector;
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const char *cap_str;
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int ret;
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/* The Type-C connector is optional, for backward compatibility. */
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connector = device_get_named_child_node(&client->dev, "connector");
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if (!connector)
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return 0;
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/* Type-C connector found. */
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ret = typec_get_fw_cap(&priv->cap, connector);
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if (ret)
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return ret;
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priv->port_type = priv->cap.type;
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/* This goes into register 0x8 field CURRENT_MODE_ADVERTISE */
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ret = fwnode_property_read_string(connector, "typec-power-opmode", &cap_str);
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if (ret)
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return ret;
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ret = typec_find_pwr_opmode(cap_str);
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if (ret < 0)
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return ret;
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if (ret == TYPEC_PWR_MODE_PD)
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return -EINVAL;
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priv->pwr_opmode = ret;
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/* Initialize the hardware with the devicetree settings. */
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ret = tusb320_set_adv_pwr_mode(priv);
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if (ret)
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return ret;
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priv->cap.revision = USB_TYPEC_REV_1_1;
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priv->cap.accessory[0] = TYPEC_ACCESSORY_AUDIO;
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priv->cap.accessory[1] = TYPEC_ACCESSORY_DEBUG;
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priv->cap.orientation_aware = true;
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priv->cap.driver_data = priv;
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priv->cap.ops = &tusb320_typec_ops;
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priv->cap.fwnode = connector;
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priv->port = typec_register_port(&client->dev, &priv->cap);
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if (IS_ERR(priv->port))
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return PTR_ERR(priv->port);
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return 0;
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}
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static int tusb320_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct tusb320_priv *priv;
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const void *match_data;
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unsigned int revision;
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int ret;
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priv = devm_kzalloc(&client->dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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priv->dev = &client->dev;
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priv->regmap = devm_regmap_init_i2c(client, &tusb320_regmap_config);
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if (IS_ERR(priv->regmap))
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return PTR_ERR(priv->regmap);
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ret = tusb320_check_signature(priv);
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if (ret)
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return ret;
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match_data = device_get_match_data(&client->dev);
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if (!match_data)
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return -EINVAL;
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priv->ops = (struct tusb320_ops*)match_data;
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if (priv->ops->get_revision) {
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ret = priv->ops->get_revision(priv, &revision);
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if (ret)
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dev_warn(priv->dev,
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"failed to read revision register: %d\n", ret);
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else
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dev_info(priv->dev, "chip revision %d\n", revision);
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}
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ret = tusb320_extcon_probe(priv);
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if (ret)
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return ret;
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ret = tusb320_typec_probe(client, priv);
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if (ret)
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return ret;
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/* update initial state */
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tusb320_irq_handler(client->irq, priv);
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/* Reset chip to its default state */
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ret = tusb320_reset(priv);
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if (ret)
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dev_warn(priv->dev, "failed to reset chip: %d\n", ret);
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else
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/*
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* State and polarity might change after a reset, so update
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* them again and make sure the interrupt status bit is cleared.
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*/
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tusb320_irq_handler(client->irq, priv);
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ret = devm_request_threaded_irq(priv->dev, client->irq, NULL,
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tusb320_irq_handler,
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IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
|
|
client->name, priv);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const struct of_device_id tusb320_extcon_dt_match[] = {
|
|
{ .compatible = "ti,tusb320", .data = &tusb320_ops, },
|
|
{ .compatible = "ti,tusb320l", .data = &tusb320l_ops, },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, tusb320_extcon_dt_match);
|
|
|
|
static struct i2c_driver tusb320_extcon_driver = {
|
|
.probe = tusb320_probe,
|
|
.driver = {
|
|
.name = "extcon-tusb320",
|
|
.of_match_table = tusb320_extcon_dt_match,
|
|
},
|
|
};
|
|
|
|
static int __init tusb320_init(void)
|
|
{
|
|
return i2c_add_driver(&tusb320_extcon_driver);
|
|
}
|
|
subsys_initcall(tusb320_init);
|
|
|
|
static void __exit tusb320_exit(void)
|
|
{
|
|
i2c_del_driver(&tusb320_extcon_driver);
|
|
}
|
|
module_exit(tusb320_exit);
|
|
|
|
MODULE_AUTHOR("Michael Auchter <michael.auchter@ni.com>");
|
|
MODULE_DESCRIPTION("TI TUSB320 extcon driver");
|
|
MODULE_LICENSE("GPL v2");
|