1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2023 Thomas Weißschuh <linux@weissschuh.net> 4 */ 5 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 6 7 #include <linux/completion.h> 8 #include <linux/device.h> 9 #include <linux/hwmon.h> 10 #include <linux/module.h> 11 #include <linux/mutex.h> 12 #include <linux/types.h> 13 #include <linux/usb.h> 14 15 #define DRIVER_NAME "powerz" 16 #define POWERZ_EP_CMD_OUT 0x01 17 #define POWERZ_EP_DATA_IN 0x81 18 19 struct powerz_sensor_data { 20 u8 _unknown_1[8]; 21 __le32 V_bus; 22 __le32 I_bus; 23 __le32 V_bus_avg; 24 __le32 I_bus_avg; 25 u8 _unknown_2[8]; 26 u8 temp[2]; 27 __le16 V_cc1; 28 __le16 V_cc2; 29 __le16 V_dp; 30 __le16 V_dm; 31 __le16 V_dd; 32 u8 _unknown_3[4]; 33 } __packed; 34 35 struct powerz_priv { 36 char transfer_buffer[64]; /* first member to satisfy DMA alignment */ 37 struct mutex mutex; 38 struct completion completion; 39 struct urb *urb; 40 int status; 41 }; 42 43 static const struct hwmon_channel_info *const powerz_info[] = { 44 HWMON_CHANNEL_INFO(in, 45 HWMON_I_INPUT | HWMON_I_LABEL | HWMON_I_AVERAGE, 46 HWMON_I_INPUT | HWMON_I_LABEL, 47 HWMON_I_INPUT | HWMON_I_LABEL, 48 HWMON_I_INPUT | HWMON_I_LABEL, 49 HWMON_I_INPUT | HWMON_I_LABEL, 50 HWMON_I_INPUT | HWMON_I_LABEL), 51 HWMON_CHANNEL_INFO(curr, 52 HWMON_C_INPUT | HWMON_C_LABEL | HWMON_C_AVERAGE), 53 HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT | HWMON_T_LABEL), 54 NULL 55 }; 56 57 static int powerz_read_string(struct device *dev, enum hwmon_sensor_types type, 58 u32 attr, int channel, const char **str) 59 { 60 if (type == hwmon_curr && attr == hwmon_curr_label) { 61 *str = "IBUS"; 62 } else if (type == hwmon_in && attr == hwmon_in_label) { 63 if (channel == 0) 64 *str = "VBUS"; 65 else if (channel == 1) 66 *str = "VCC1"; 67 else if (channel == 2) 68 *str = "VCC2"; 69 else if (channel == 3) 70 *str = "VDP"; 71 else if (channel == 4) 72 *str = "VDM"; 73 else if (channel == 5) 74 *str = "VDD"; 75 else 76 return -EOPNOTSUPP; 77 } else if (type == hwmon_temp && attr == hwmon_temp_label) { 78 *str = "TEMP"; 79 } else { 80 return -EOPNOTSUPP; 81 } 82 83 return 0; 84 } 85 86 static void powerz_usb_data_complete(struct urb *urb) 87 { 88 struct powerz_priv *priv = urb->context; 89 90 complete(&priv->completion); 91 } 92 93 static void powerz_usb_cmd_complete(struct urb *urb) 94 { 95 struct powerz_priv *priv = urb->context; 96 97 usb_fill_bulk_urb(urb, urb->dev, 98 usb_rcvbulkpipe(urb->dev, POWERZ_EP_DATA_IN), 99 priv->transfer_buffer, sizeof(priv->transfer_buffer), 100 powerz_usb_data_complete, priv); 101 102 priv->status = usb_submit_urb(urb, GFP_ATOMIC); 103 if (priv->status) 104 complete(&priv->completion); 105 } 106 107 static int powerz_read_data(struct usb_device *udev, struct powerz_priv *priv) 108 { 109 int ret; 110 111 priv->status = -ETIMEDOUT; 112 reinit_completion(&priv->completion); 113 114 priv->transfer_buffer[0] = 0x0c; 115 priv->transfer_buffer[1] = 0x00; 116 priv->transfer_buffer[2] = 0x02; 117 priv->transfer_buffer[3] = 0x00; 118 119 usb_fill_bulk_urb(priv->urb, udev, 120 usb_sndbulkpipe(udev, POWERZ_EP_CMD_OUT), 121 priv->transfer_buffer, 4, powerz_usb_cmd_complete, 122 priv); 123 ret = usb_submit_urb(priv->urb, GFP_KERNEL); 124 if (ret) 125 return ret; 126 127 if (!wait_for_completion_interruptible_timeout 128 (&priv->completion, msecs_to_jiffies(5))) { 129 usb_kill_urb(priv->urb); 130 return -EIO; 131 } 132 133 if (priv->urb->actual_length < sizeof(struct powerz_sensor_data)) 134 return -EIO; 135 136 return priv->status; 137 } 138 139 static int powerz_read(struct device *dev, enum hwmon_sensor_types type, 140 u32 attr, int channel, long *val) 141 { 142 struct usb_interface *intf = to_usb_interface(dev->parent); 143 struct usb_device *udev = interface_to_usbdev(intf); 144 struct powerz_priv *priv = usb_get_intfdata(intf); 145 struct powerz_sensor_data *data; 146 int ret; 147 148 if (!priv) 149 return -EIO; /* disconnected */ 150 151 mutex_lock(&priv->mutex); 152 ret = powerz_read_data(udev, priv); 153 if (ret) 154 goto out; 155 156 data = (struct powerz_sensor_data *)priv->transfer_buffer; 157 158 if (type == hwmon_curr) { 159 if (attr == hwmon_curr_input) 160 *val = ((s32)le32_to_cpu(data->I_bus)) / 1000; 161 else if (attr == hwmon_curr_average) 162 *val = ((s32)le32_to_cpu(data->I_bus_avg)) / 1000; 163 else 164 ret = -EOPNOTSUPP; 165 } else if (type == hwmon_in) { 166 if (attr == hwmon_in_input) { 167 if (channel == 0) 168 *val = le32_to_cpu(data->V_bus) / 1000; 169 else if (channel == 1) 170 *val = le16_to_cpu(data->V_cc1) / 10; 171 else if (channel == 2) 172 *val = le16_to_cpu(data->V_cc2) / 10; 173 else if (channel == 3) 174 *val = le16_to_cpu(data->V_dp) / 10; 175 else if (channel == 4) 176 *val = le16_to_cpu(data->V_dm) / 10; 177 else if (channel == 5) 178 *val = le16_to_cpu(data->V_dd) / 10; 179 else 180 ret = -EOPNOTSUPP; 181 } else if (attr == hwmon_in_average && channel == 0) { 182 *val = le32_to_cpu(data->V_bus_avg) / 1000; 183 } else { 184 ret = -EOPNOTSUPP; 185 } 186 } else if (type == hwmon_temp && attr == hwmon_temp_input) { 187 *val = data->temp[1] * 2000 + data->temp[0] * 1000 / 128; 188 } else { 189 ret = -EOPNOTSUPP; 190 } 191 192 out: 193 mutex_unlock(&priv->mutex); 194 return ret; 195 } 196 197 static const struct hwmon_ops powerz_hwmon_ops = { 198 .visible = 0444, 199 .read = powerz_read, 200 .read_string = powerz_read_string, 201 }; 202 203 static const struct hwmon_chip_info powerz_chip_info = { 204 .ops = &powerz_hwmon_ops, 205 .info = powerz_info, 206 }; 207 208 static int powerz_probe(struct usb_interface *intf, 209 const struct usb_device_id *id) 210 { 211 struct powerz_priv *priv; 212 struct device *hwmon_dev; 213 struct device *parent; 214 215 parent = &intf->dev; 216 217 priv = devm_kzalloc(parent, sizeof(*priv), GFP_KERNEL); 218 if (!priv) 219 return -ENOMEM; 220 221 priv->urb = usb_alloc_urb(0, GFP_KERNEL); 222 if (!priv->urb) 223 return -ENOMEM; 224 mutex_init(&priv->mutex); 225 init_completion(&priv->completion); 226 227 hwmon_dev = 228 devm_hwmon_device_register_with_info(parent, DRIVER_NAME, priv, 229 &powerz_chip_info, NULL); 230 if (IS_ERR(hwmon_dev)) { 231 usb_free_urb(priv->urb); 232 return PTR_ERR(hwmon_dev); 233 } 234 235 usb_set_intfdata(intf, priv); 236 237 return 0; 238 } 239 240 static void powerz_disconnect(struct usb_interface *intf) 241 { 242 struct powerz_priv *priv = usb_get_intfdata(intf); 243 244 mutex_lock(&priv->mutex); 245 usb_kill_urb(priv->urb); 246 usb_free_urb(priv->urb); 247 mutex_unlock(&priv->mutex); 248 } 249 250 static const struct usb_device_id powerz_id_table[] = { 251 { USB_DEVICE_INTERFACE_NUMBER(0x5FC9, 0x0061, 0x00) }, /* ChargerLAB POWER-Z KM002C */ 252 { USB_DEVICE_INTERFACE_NUMBER(0x5FC9, 0x0063, 0x00) }, /* ChargerLAB POWER-Z KM003C */ 253 { } 254 }; 255 256 MODULE_DEVICE_TABLE(usb, powerz_id_table); 257 258 static struct usb_driver powerz_driver = { 259 .name = DRIVER_NAME, 260 .id_table = powerz_id_table, 261 .probe = powerz_probe, 262 .disconnect = powerz_disconnect, 263 }; 264 265 module_usb_driver(powerz_driver); 266 267 MODULE_LICENSE("GPL"); 268 MODULE_AUTHOR("Thomas Weißschuh <linux@weissschuh.net>"); 269 MODULE_DESCRIPTION("ChargerLAB POWER-Z USB-C tester"); 270