| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Luca Weiss | 1453 | 100.00% | 2 | 100.00% |
| Total | 1453 | 2 |
// SPDX-License-Identifier: GPL-2.0+ /* * NXP PTN36502 Type-C driver * * Copyright (C) 2023 Luca Weiss <luca.weiss@fairphone.com> * * Based on NB7VPQ904M driver: * Copyright (C) 2023 Dmitry Baryshkov <dmitry.baryshkov@linaro.org> */ #include <drm/bridge/aux-bridge.h> #include <linux/bitfield.h> #include <linux/i2c.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/mutex.h> #include <linux/of_graph.h> #include <linux/regmap.h> #include <linux/regulator/consumer.h> #include <linux/usb/typec_dp.h> #include <linux/usb/typec_mux.h> #include <linux/usb/typec_retimer.h> #define PTN36502_CHIP_ID_REG 0x00 #define PTN36502_CHIP_ID 0x02 #define PTN36502_CHIP_REVISION_REG 0x01 #define PTN36502_CHIP_REVISION_BASE_MASK GENMASK(7, 4) #define PTN36502_CHIP_REVISION_METAL_MASK GENMASK(3, 0) #define PTN36502_DP_LINK_CTRL_REG 0x06 #define PTN36502_DP_LINK_CTRL_LANES_MASK GENMASK(3, 2) #define PTN36502_DP_LINK_CTRL_LANES_2 (2) #define PTN36502_DP_LINK_CTRL_LANES_4 (3) #define PTN36502_DP_LINK_CTRL_LINK_RATE_MASK GENMASK(1, 0) #define PTN36502_DP_LINK_CTRL_LINK_RATE_5_4GBPS (2) /* Registers for lane 0 (0x07) to lane 3 (0x0a) have the same layout */ #define PTN36502_DP_LANE_CTRL_REG(n) (0x07 + (n)) #define PTN36502_DP_LANE_CTRL_RX_GAIN_MASK GENMASK(6, 4) #define PTN36502_DP_LANE_CTRL_RX_GAIN_3DB (2) #define PTN36502_DP_LANE_CTRL_TX_SWING_MASK GENMASK(3, 2) #define PTN36502_DP_LANE_CTRL_TX_SWING_800MVPPD (2) #define PTN36502_DP_LANE_CTRL_PRE_EMPHASIS_MASK GENMASK(1, 0) #define PTN36502_DP_LANE_CTRL_PRE_EMPHASIS_3_5DB (1) #define PTN36502_MODE_CTRL1_REG 0x0b #define PTN36502_MODE_CTRL1_PLUG_ORIENT_MASK GENMASK(5, 5) #define PTN36502_MODE_CTRL1_PLUG_ORIENT_REVERSE (1) #define PTN36502_MODE_CTRL1_AUX_CROSSBAR_MASK GENMASK(3, 3) #define PTN36502_MODE_CTRL1_AUX_CROSSBAR_SW_ON (1) #define PTN36502_MODE_CTRL1_MODE_MASK GENMASK(2, 0) #define PTN36502_MODE_CTRL1_MODE_OFF (0) #define PTN36502_MODE_CTRL1_MODE_USB_ONLY (1) #define PTN36502_MODE_CTRL1_MODE_USB_DP (2) #define PTN36502_MODE_CTRL1_MODE_DP (3) #define PTN36502_DEVICE_CTRL_REG 0x0d #define PTN36502_DEVICE_CTRL_AUX_MONITORING_MASK GENMASK(7, 7) #define PTN36502_DEVICE_CTRL_AUX_MONITORING_EN (1) struct ptn36502 { struct i2c_client *client; struct regulator *vdd18_supply; struct regmap *regmap; struct typec_switch_dev *sw; struct typec_retimer *retimer; struct typec_switch *typec_switch; struct mutex lock; /* protect non-concurrent retimer & switch */ enum typec_orientation orientation; unsigned long mode; unsigned int svid; }; static int ptn36502_set(struct ptn36502 *ptn) { bool reverse = (ptn->orientation == TYPEC_ORIENTATION_REVERSE); unsigned int ctrl1_val = 0; unsigned int lane_ctrl_val = 0; unsigned int link_ctrl_val = 0; switch (ptn->mode) { case TYPEC_STATE_SAFE: /* Deep power saving state */ regmap_write(ptn->regmap, PTN36502_MODE_CTRL1_REG, FIELD_PREP(PTN36502_MODE_CTRL1_MODE_MASK, PTN36502_MODE_CTRL1_MODE_OFF)); return 0; case TYPEC_STATE_USB: /* * Normal Orientation (CC1) * A -> USB RX * B -> USB TX * C -> X * D -> X * Flipped Orientation (CC2) * A -> X * B -> X * C -> USB TX * D -> USB RX */ /* USB 3.1 Gen 1 only */ ctrl1_val = FIELD_PREP(PTN36502_MODE_CTRL1_MODE_MASK, PTN36502_MODE_CTRL1_MODE_USB_ONLY); if (reverse) ctrl1_val |= FIELD_PREP(PTN36502_MODE_CTRL1_PLUG_ORIENT_MASK, PTN36502_MODE_CTRL1_PLUG_ORIENT_REVERSE); regmap_write(ptn->regmap, PTN36502_MODE_CTRL1_REG, ctrl1_val); return 0; default: if (ptn->svid != USB_TYPEC_DP_SID) return -EINVAL; break; } /* DP Altmode Setup */ switch (ptn->mode) { case TYPEC_DP_STATE_C: case TYPEC_DP_STATE_E: /* * Normal Orientation (CC1) * A -> DP3 * B -> DP2 * C -> DP1 * D -> DP0 * Flipped Orientation (CC2) * A -> DP0 * B -> DP1 * C -> DP2 * D -> DP3 */ /* 4-lane DP */ ctrl1_val |= FIELD_PREP(PTN36502_MODE_CTRL1_MODE_MASK, PTN36502_MODE_CTRL1_MODE_DP); link_ctrl_val |= FIELD_PREP(PTN36502_DP_LINK_CTRL_LANES_MASK, PTN36502_DP_LINK_CTRL_LANES_4); break; case TYPEC_DP_STATE_D: case TYPEC_DP_STATE_F: /* State F is deprecated */ /* * Normal Orientation (CC1) * A -> USB RX * B -> USB TX * C -> DP1 * D -> DP0 * Flipped Orientation (CC2) * A -> DP0 * B -> DP1 * C -> USB TX * D -> USB RX */ /* USB 3.1 Gen 1 and 2-lane DP */ ctrl1_val |= FIELD_PREP(PTN36502_MODE_CTRL1_MODE_MASK, PTN36502_MODE_CTRL1_MODE_USB_DP); link_ctrl_val |= FIELD_PREP(PTN36502_DP_LINK_CTRL_LANES_MASK, PTN36502_DP_LINK_CTRL_LANES_2); break; default: return -EOPNOTSUPP; } /* Enable AUX monitoring */ regmap_write(ptn->regmap, PTN36502_DEVICE_CTRL_REG, FIELD_PREP(PTN36502_DEVICE_CTRL_AUX_MONITORING_MASK, PTN36502_DEVICE_CTRL_AUX_MONITORING_EN)); /* Enable AUX switch path */ ctrl1_val |= FIELD_PREP(PTN36502_MODE_CTRL1_AUX_CROSSBAR_MASK, PTN36502_MODE_CTRL1_AUX_CROSSBAR_SW_ON); if (reverse) ctrl1_val |= FIELD_PREP(PTN36502_MODE_CTRL1_PLUG_ORIENT_MASK, PTN36502_MODE_CTRL1_PLUG_ORIENT_REVERSE); regmap_write(ptn->regmap, PTN36502_MODE_CTRL1_REG, ctrl1_val); /* DP Link rate: 5.4 Gbps (HBR2) */ link_ctrl_val |= FIELD_PREP(PTN36502_DP_LINK_CTRL_LINK_RATE_MASK, PTN36502_DP_LINK_CTRL_LINK_RATE_5_4GBPS); regmap_write(ptn->regmap, PTN36502_DP_LINK_CTRL_REG, link_ctrl_val); /* * For all lanes: * - Rx equivalization gain: 3 dB * - TX output swing control: 800 mVppd * - Pre-emphasis control: 3.5 dB */ lane_ctrl_val = FIELD_PREP(PTN36502_DP_LANE_CTRL_RX_GAIN_MASK, PTN36502_DP_LANE_CTRL_RX_GAIN_3DB) | FIELD_PREP(PTN36502_DP_LANE_CTRL_TX_SWING_MASK, PTN36502_DP_LANE_CTRL_TX_SWING_800MVPPD) | FIELD_PREP(PTN36502_DP_LANE_CTRL_PRE_EMPHASIS_MASK, PTN36502_DP_LANE_CTRL_PRE_EMPHASIS_3_5DB); regmap_write(ptn->regmap, PTN36502_DP_LANE_CTRL_REG(0), lane_ctrl_val); regmap_write(ptn->regmap, PTN36502_DP_LANE_CTRL_REG(1), lane_ctrl_val); regmap_write(ptn->regmap, PTN36502_DP_LANE_CTRL_REG(2), lane_ctrl_val); regmap_write(ptn->regmap, PTN36502_DP_LANE_CTRL_REG(3), lane_ctrl_val); return 0; } static int ptn36502_sw_set(struct typec_switch_dev *sw, enum typec_orientation orientation) { struct ptn36502 *ptn = typec_switch_get_drvdata(sw); int ret; ret = typec_switch_set(ptn->typec_switch, orientation); if (ret) return ret; mutex_lock(&ptn->lock); if (ptn->orientation != orientation) { ptn->orientation = orientation; ret = ptn36502_set(ptn); } mutex_unlock(&ptn->lock); return ret; } static int ptn36502_retimer_set(struct typec_retimer *retimer, struct typec_retimer_state *state) { struct ptn36502 *ptn = typec_retimer_get_drvdata(retimer); int ret = 0; mutex_lock(&ptn->lock); if (ptn->mode != state->mode) { ptn->mode = state->mode; if (state->alt) ptn->svid = state->alt->svid; else ptn->svid = 0; // No SVID ret = ptn36502_set(ptn); } mutex_unlock(&ptn->lock); return ret; } static int ptn36502_detect(struct ptn36502 *ptn) { struct device *dev = &ptn->client->dev; unsigned int reg_val; int ret; ret = regmap_read(ptn->regmap, PTN36502_CHIP_ID_REG, ®_val); if (ret < 0) return dev_err_probe(dev, ret, "Failed to read chip ID\n"); if (reg_val != PTN36502_CHIP_ID) return dev_err_probe(dev, -ENODEV, "Unexpected chip ID: %x\n", reg_val); ret = regmap_read(ptn->regmap, PTN36502_CHIP_REVISION_REG, ®_val); if (ret < 0) return dev_err_probe(dev, ret, "Failed to read chip revision\n"); dev_dbg(dev, "Chip revision: base layer version %lx, metal layer version %lx\n", FIELD_GET(PTN36502_CHIP_REVISION_BASE_MASK, reg_val), FIELD_GET(PTN36502_CHIP_REVISION_METAL_MASK, reg_val)); return 0; } static const struct regmap_config ptn36502_regmap = { .max_register = 0x0d, .reg_bits = 8, .val_bits = 8, }; static int ptn36502_probe(struct i2c_client *client) { struct device *dev = &client->dev; struct typec_switch_desc sw_desc = { }; struct typec_retimer_desc retimer_desc = { }; struct ptn36502 *ptn; int ret; ptn = devm_kzalloc(dev, sizeof(*ptn), GFP_KERNEL); if (!ptn) return -ENOMEM; ptn->client = client; ptn->regmap = devm_regmap_init_i2c(client, &ptn36502_regmap); if (IS_ERR(ptn->regmap)) { dev_err(&client->dev, "Failed to allocate register map\n"); return PTR_ERR(ptn->regmap); } ptn->mode = TYPEC_STATE_SAFE; ptn->orientation = TYPEC_ORIENTATION_NONE; mutex_init(&ptn->lock); ptn->vdd18_supply = devm_regulator_get_optional(dev, "vdd18"); if (IS_ERR(ptn->vdd18_supply)) return PTR_ERR(ptn->vdd18_supply); ptn->typec_switch = fwnode_typec_switch_get(dev->fwnode); if (IS_ERR(ptn->typec_switch)) return dev_err_probe(dev, PTR_ERR(ptn->typec_switch), "Failed to acquire orientation-switch\n"); ret = regulator_enable(ptn->vdd18_supply); if (ret) return dev_err_probe(dev, ret, "Failed to enable vdd18\n"); ret = ptn36502_detect(ptn); if (ret) goto err_disable_regulator; ret = drm_aux_bridge_register(dev); if (ret) goto err_disable_regulator; sw_desc.drvdata = ptn; sw_desc.fwnode = dev->fwnode; sw_desc.set = ptn36502_sw_set; ptn->sw = typec_switch_register(dev, &sw_desc); if (IS_ERR(ptn->sw)) { ret = dev_err_probe(dev, PTR_ERR(ptn->sw), "Failed to register typec switch\n"); goto err_disable_regulator; } retimer_desc.drvdata = ptn; retimer_desc.fwnode = dev->fwnode; retimer_desc.set = ptn36502_retimer_set; ptn->retimer = typec_retimer_register(dev, &retimer_desc); if (IS_ERR(ptn->retimer)) { ret = dev_err_probe(dev, PTR_ERR(ptn->retimer), "Failed to register typec retimer\n"); goto err_switch_unregister; } return 0; err_switch_unregister: typec_switch_unregister(ptn->sw); err_disable_regulator: regulator_disable(ptn->vdd18_supply); return ret; } static void ptn36502_remove(struct i2c_client *client) { struct ptn36502 *ptn = i2c_get_clientdata(client); typec_retimer_unregister(ptn->retimer); typec_switch_unregister(ptn->sw); regulator_disable(ptn->vdd18_supply); } static const struct i2c_device_id ptn36502_table[] = { { "ptn36502" }, { } }; MODULE_DEVICE_TABLE(i2c, ptn36502_table); static const struct of_device_id ptn36502_of_table[] = { { .compatible = "nxp,ptn36502" }, { } }; MODULE_DEVICE_TABLE(of, ptn36502_of_table); static struct i2c_driver ptn36502_driver = { .driver = { .name = "ptn36502", .of_match_table = ptn36502_of_table, }, .probe = ptn36502_probe, .remove = ptn36502_remove, .id_table = ptn36502_table, }; module_i2c_driver(ptn36502_driver); MODULE_AUTHOR("Luca Weiss <luca.weiss@fairphone.com>"); MODULE_DESCRIPTION("NXP PTN36502 Type-C driver"); MODULE_LICENSE("GPL");
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