diff options
Diffstat (limited to 'drivers/usb/typec/mux/pi3usb30532.c')
| -rw-r--r-- | drivers/usb/typec/mux/pi3usb30532.c | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/drivers/usb/typec/mux/pi3usb30532.c b/drivers/usb/typec/mux/pi3usb30532.c new file mode 100644 index 000000000..1cd388b55 --- /dev/null +++ b/drivers/usb/typec/mux/pi3usb30532.c @@ -0,0 +1,190 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Pericom PI3USB30532 Type-C cross switch / mux driver + * + * Copyright (c) 2017-2018 Hans de Goede <hdegoede@redhat.com> + */ + +#include <linux/i2c.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/usb/typec_dp.h> +#include <linux/usb/typec_mux.h> + +#define PI3USB30532_CONF 0x00 + +#define PI3USB30532_CONF_OPEN 0x00 +#define PI3USB30532_CONF_SWAP 0x01 +#define PI3USB30532_CONF_4LANE_DP 0x02 +#define PI3USB30532_CONF_USB3 0x04 +#define PI3USB30532_CONF_USB3_AND_2LANE_DP 0x06 + +struct pi3usb30532 { + struct i2c_client *client; + struct mutex lock; /* protects the cached conf register */ + struct typec_switch_dev *sw; + struct typec_mux_dev *mux; + u8 conf; +}; + +static int pi3usb30532_set_conf(struct pi3usb30532 *pi, u8 new_conf) +{ + int ret = 0; + + if (pi->conf == new_conf) + return 0; + + ret = i2c_smbus_write_byte_data(pi->client, PI3USB30532_CONF, new_conf); + if (ret) { + dev_err(&pi->client->dev, "Error writing conf: %d\n", ret); + return ret; + } + + pi->conf = new_conf; + return 0; +} + +static int pi3usb30532_sw_set(struct typec_switch_dev *sw, + enum typec_orientation orientation) +{ + struct pi3usb30532 *pi = typec_switch_get_drvdata(sw); + u8 new_conf; + int ret; + + mutex_lock(&pi->lock); + new_conf = pi->conf; + + switch (orientation) { + case TYPEC_ORIENTATION_NONE: + new_conf = PI3USB30532_CONF_OPEN; + break; + case TYPEC_ORIENTATION_NORMAL: + new_conf &= ~PI3USB30532_CONF_SWAP; + break; + case TYPEC_ORIENTATION_REVERSE: + new_conf |= PI3USB30532_CONF_SWAP; + break; + } + + ret = pi3usb30532_set_conf(pi, new_conf); + mutex_unlock(&pi->lock); + + return ret; +} + +static int +pi3usb30532_mux_set(struct typec_mux_dev *mux, struct typec_mux_state *state) +{ + struct pi3usb30532 *pi = typec_mux_get_drvdata(mux); + u8 new_conf; + int ret; + + mutex_lock(&pi->lock); + new_conf = pi->conf; + + switch (state->mode) { + case TYPEC_STATE_SAFE: + new_conf = (new_conf & PI3USB30532_CONF_SWAP) | + PI3USB30532_CONF_OPEN; + break; + case TYPEC_STATE_USB: + new_conf = (new_conf & PI3USB30532_CONF_SWAP) | + PI3USB30532_CONF_USB3; + break; + case TYPEC_DP_STATE_C: + case TYPEC_DP_STATE_E: + new_conf = (new_conf & PI3USB30532_CONF_SWAP) | + PI3USB30532_CONF_4LANE_DP; + break; + case TYPEC_DP_STATE_D: + new_conf = (new_conf & PI3USB30532_CONF_SWAP) | + PI3USB30532_CONF_USB3_AND_2LANE_DP; + break; + default: + break; + } + + ret = pi3usb30532_set_conf(pi, new_conf); + mutex_unlock(&pi->lock); + + return ret; +} + +static int pi3usb30532_probe(struct i2c_client *client) +{ + struct device *dev = &client->dev; + struct typec_switch_desc sw_desc = { }; + struct typec_mux_desc mux_desc = { }; + struct pi3usb30532 *pi; + int ret; + + pi = devm_kzalloc(dev, sizeof(*pi), GFP_KERNEL); + if (!pi) + return -ENOMEM; + + pi->client = client; + mutex_init(&pi->lock); + + ret = i2c_smbus_read_byte_data(client, PI3USB30532_CONF); + if (ret < 0) { + dev_err(dev, "Error reading config register %d\n", ret); + return ret; + } + pi->conf = ret; + + sw_desc.drvdata = pi; + sw_desc.fwnode = dev->fwnode; + sw_desc.set = pi3usb30532_sw_set; + + pi->sw = typec_switch_register(dev, &sw_desc); + if (IS_ERR(pi->sw)) { + dev_err(dev, "Error registering typec switch: %ld\n", + PTR_ERR(pi->sw)); + return PTR_ERR(pi->sw); + } + + mux_desc.drvdata = pi; + mux_desc.fwnode = dev->fwnode; + mux_desc.set = pi3usb30532_mux_set; + + pi->mux = typec_mux_register(dev, &mux_desc); + if (IS_ERR(pi->mux)) { + typec_switch_unregister(pi->sw); + dev_err(dev, "Error registering typec mux: %ld\n", + PTR_ERR(pi->mux)); + return PTR_ERR(pi->mux); + } + + i2c_set_clientdata(client, pi); + return 0; +} + +static void pi3usb30532_remove(struct i2c_client *client) +{ + struct pi3usb30532 *pi = i2c_get_clientdata(client); + + typec_mux_unregister(pi->mux); + typec_switch_unregister(pi->sw); +} + +static const struct i2c_device_id pi3usb30532_table[] = { + { "pi3usb30532" }, + { } +}; +MODULE_DEVICE_TABLE(i2c, pi3usb30532_table); + +static struct i2c_driver pi3usb30532_driver = { + .driver = { + .name = "pi3usb30532", + }, + .probe_new = pi3usb30532_probe, + .remove = pi3usb30532_remove, + .id_table = pi3usb30532_table, +}; + +module_i2c_driver(pi3usb30532_driver); + +MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>"); +MODULE_DESCRIPTION("Pericom PI3USB30532 Type-C mux driver"); +MODULE_LICENSE("GPL"); |