drivers/usb/typec/qcom-pmic-typec.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2020, The Linux Foundation. All rights reserved.
   4  */
   5
   6 #include <linux/err.h>
   7 #include <linux/interrupt.h>
   8 #include <linux/kernel.h>
   9 #include <linux/mod_devicetable.h>
  10 #include <linux/module.h>
  11 #include <linux/platform_device.h>
  12 #include <linux/regmap.h>
  13 #include <linux/regulator/consumer.h>
  14 #include <linux/slab.h>
  15 #include <linux/usb/role.h>
  16 #include <linux/usb/typec_mux.h>
  17
  18 #define TYPEC_MISC_STATUS               0xb
  19 #define CC_ATTACHED                     BIT(0)
  20 #define CC_ORIENTATION                  BIT(1)
  21 #define SNK_SRC_MODE                    BIT(6)
  22 #define TYPEC_MODE_CFG                  0x44
  23 #define TYPEC_DISABLE_CMD               BIT(0)
  24 #define EN_SNK_ONLY                     BIT(1)
  25 #define EN_SRC_ONLY                     BIT(2)
  26 #define TYPEC_VCONN_CONTROL             0x46
  27 #define VCONN_EN_SRC                    BIT(0)
  28 #define VCONN_EN_VAL                    BIT(1)
  29 #define TYPEC_EXIT_STATE_CFG            0x50
  30 #define SEL_SRC_UPPER_REF               BIT(2)
  31 #define TYPEC_INTR_EN_CFG_1             0x5e
  32 #define TYPEC_INTR_EN_CFG_1_MASK        GENMASK(7, 0)
  33
  34 struct qcom_pmic_typec {
  35         struct device           *dev;
  36         struct regmap           *regmap;
  37         u32                     base;
  38
  39         struct typec_port       *port;
  40         struct usb_role_switch *role_sw;
  41
  42         struct regulator        *vbus_reg;
  43         bool                    vbus_enabled;
  44 };
  45
  46 static void qcom_pmic_typec_enable_vbus_regulator(struct qcom_pmic_typec
  47                                                         *qcom_usb, bool enable)
  48 {
  49         int ret;
  50
  51         if (enable == qcom_usb->vbus_enabled)
  52                 return;
  53
  54         if (enable) {
  55                 ret = regulator_enable(qcom_usb->vbus_reg);
  56                 if (ret)
  57                         return;
  58         } else {
  59                 ret = regulator_disable(qcom_usb->vbus_reg);
  60                 if (ret)
  61                         return;
  62         }
  63         qcom_usb->vbus_enabled = enable;
  64 }
  65
  66 static void qcom_pmic_typec_check_connection(struct qcom_pmic_typec *qcom_usb)
  67 {
  68         enum typec_orientation orientation;
  69         enum usb_role role;
  70         unsigned int stat;
  71         bool enable_vbus;
  72
  73         regmap_read(qcom_usb->regmap, qcom_usb->base + TYPEC_MISC_STATUS,
  74                     &stat);
  75
  76         if (stat & CC_ATTACHED) {
  77                 orientation = (stat & CC_ORIENTATION) ?
  78                                 TYPEC_ORIENTATION_REVERSE :
  79                                 TYPEC_ORIENTATION_NORMAL;
  80                 typec_set_orientation(qcom_usb->port, orientation);
  81
  82                 role = (stat & SNK_SRC_MODE) ? USB_ROLE_HOST : USB_ROLE_DEVICE;
  83                 if (role == USB_ROLE_HOST)
  84                         enable_vbus = true;
  85                 else
  86                         enable_vbus = false;
  87         } else {
  88                 role = USB_ROLE_NONE;
  89                 enable_vbus = false;
  90         }
  91
  92         qcom_pmic_typec_enable_vbus_regulator(qcom_usb, enable_vbus);
  93         usb_role_switch_set_role(qcom_usb->role_sw, role);
  94 }
  95
  96 static irqreturn_t qcom_pmic_typec_interrupt(int irq, void *_qcom_usb)
  97 {
  98         struct qcom_pmic_typec *qcom_usb = _qcom_usb;
  99
 100         qcom_pmic_typec_check_connection(qcom_usb);
 101         return IRQ_HANDLED;
 102 }
 103
 104 static void qcom_pmic_typec_typec_hw_init(struct qcom_pmic_typec *qcom_usb,
 105                                           enum typec_port_type type)
 106 {
 107         u8 mode = 0;
 108
 109         regmap_update_bits(qcom_usb->regmap,
 110                            qcom_usb->base + TYPEC_INTR_EN_CFG_1,
 111                            TYPEC_INTR_EN_CFG_1_MASK, 0);
 112
 113         if (type == TYPEC_PORT_SRC)
 114                 mode = EN_SRC_ONLY;
 115         else if (type == TYPEC_PORT_SNK)
 116                 mode = EN_SNK_ONLY;
 117
 118         regmap_update_bits(qcom_usb->regmap, qcom_usb->base + TYPEC_MODE_CFG,
 119                            EN_SNK_ONLY | EN_SRC_ONLY, mode);
 120
 121         regmap_update_bits(qcom_usb->regmap,
 122                            qcom_usb->base + TYPEC_VCONN_CONTROL,
 123                            VCONN_EN_SRC | VCONN_EN_VAL, VCONN_EN_SRC);
 124         regmap_update_bits(qcom_usb->regmap,
 125                            qcom_usb->base + TYPEC_EXIT_STATE_CFG,
 126                            SEL_SRC_UPPER_REF, SEL_SRC_UPPER_REF);
 127 }
 128
 129 static int qcom_pmic_typec_probe(struct platform_device *pdev)
 130 {
 131         struct qcom_pmic_typec *qcom_usb;
 132         struct device *dev = &pdev->dev;
 133         struct fwnode_handle *fwnode;
 134         struct typec_capability cap;
 135         const char *buf;
 136         int ret, irq, role;
 137         u32 reg;
 138
 139         ret = device_property_read_u32(dev, "reg", &reg);
 140         if (ret < 0) {
 141                 dev_err(dev, "missing base address\n");
 142                 return ret;
 143         }
 144
 145         qcom_usb = devm_kzalloc(dev, sizeof(*qcom_usb), GFP_KERNEL);
 146         if (!qcom_usb)
 147                 return -ENOMEM;
 148
 149         qcom_usb->dev = dev;
 150         qcom_usb->base = reg;
 151
 152         qcom_usb->regmap = dev_get_regmap(dev->parent, NULL);
 153         if (!qcom_usb->regmap) {
 154                 dev_err(dev, "Failed to get regmap\n");
 155                 return -EINVAL;
 156         }
 157
 158         qcom_usb->vbus_reg = devm_regulator_get(qcom_usb->dev, "usb_vbus");
 159         if (IS_ERR(qcom_usb->vbus_reg))
 160                 return PTR_ERR(qcom_usb->vbus_reg);
 161
 162         fwnode = device_get_named_child_node(dev, "connector");
 163         if (!fwnode)
 164                 return -EINVAL;
 165
 166         ret = fwnode_property_read_string(fwnode, "power-role", &buf);
 167         if (!ret) {
 168                 role = typec_find_port_power_role(buf);
 169                 if (role < 0)
 170                         role = TYPEC_PORT_SNK;
 171         } else {
 172                 role = TYPEC_PORT_SNK;
 173         }
 174         cap.type = role;
 175
 176         ret = fwnode_property_read_string(fwnode, "data-role", &buf);
 177         if (!ret) {
 178                 role = typec_find_port_data_role(buf);
 179                 if (role < 0)
 180                         role = TYPEC_PORT_UFP;
 181         } else {
 182                 role = TYPEC_PORT_UFP;
 183         }
 184         cap.data = role;
 185
 186         cap.prefer_role = TYPEC_NO_PREFERRED_ROLE;
 187         cap.fwnode = fwnode;
 188         qcom_usb->port = typec_register_port(dev, &cap);
 189         if (IS_ERR(qcom_usb->port)) {
 190                 ret = PTR_ERR(qcom_usb->port);
 191                 dev_err(dev, "Failed to register type c port %d\n", ret);
 192                 goto err_put_node;
 193         }
 194         fwnode_handle_put(fwnode);
 195
 196         qcom_usb->role_sw = fwnode_usb_role_switch_get(dev_fwnode(qcom_usb->dev));
 197         if (IS_ERR(qcom_usb->role_sw)) {
 198                 if (PTR_ERR(qcom_usb->role_sw) != -EPROBE_DEFER)
 199                         dev_err(dev, "failed to get role switch\n");
 200                 ret = PTR_ERR(qcom_usb->role_sw);
 201                 goto err_typec_port;
 202         }
 203
 204         irq = platform_get_irq(pdev, 0);
 205         if (irq < 0)
 206                 goto err_usb_role_sw;
 207
 208         ret = devm_request_threaded_irq(qcom_usb->dev, irq, NULL,
 209                                         qcom_pmic_typec_interrupt, IRQF_ONESHOT,
 210                                         "qcom-pmic-typec", qcom_usb);
 211         if (ret) {
 212                 dev_err(&pdev->dev, "Could not request IRQ\n");
 213                 goto err_usb_role_sw;
 214         }
 215
 216         platform_set_drvdata(pdev, qcom_usb);
 217         qcom_pmic_typec_typec_hw_init(qcom_usb, cap.type);
 218         qcom_pmic_typec_check_connection(qcom_usb);
 219
 220         return 0;
 221
 222 err_usb_role_sw:
 223         usb_role_switch_put(qcom_usb->role_sw);
 224 err_typec_port:
 225         typec_unregister_port(qcom_usb->port);
 226 err_put_node:
 227         fwnode_handle_put(fwnode);
 228
 229         return ret;
 230 }
 231
 232 static int qcom_pmic_typec_remove(struct platform_device *pdev)
 233 {
 234         struct qcom_pmic_typec *qcom_usb = platform_get_drvdata(pdev);
 235
 236         usb_role_switch_set_role(qcom_usb->role_sw, USB_ROLE_NONE);
 237         qcom_pmic_typec_enable_vbus_regulator(qcom_usb, 0);
 238
 239         typec_unregister_port(qcom_usb->port);
 240         usb_role_switch_put(qcom_usb->role_sw);
 241
 242         return 0;
 243 }
 244
 245 static const struct of_device_id qcom_pmic_typec_table[] = {
 246         { .compatible = "qcom,pm8150b-usb-typec" },
 247         { }
 248 };
 249 MODULE_DEVICE_TABLE(of, qcom_pmic_typec_table);
 250
 251 static struct platform_driver qcom_pmic_typec = {
 252         .driver = {
 253                 .name = "qcom,pmic-typec",
 254                 .of_match_table = qcom_pmic_typec_table,
 255         },
 256         .probe = qcom_pmic_typec_probe,
 257         .remove = qcom_pmic_typec_remove,
 258 };
 259 module_platform_driver(qcom_pmic_typec);
 260
 261 MODULE_DESCRIPTION("QCOM PMIC USB type C driver");
 262 MODULE_LICENSE("GPL v2");