1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Serial multi-instantiate driver, pseudo driver to instantiate multiple 4 * client devices from a single fwnode. 5 * 6 * Copyright 2018 Hans de Goede <hdegoede@redhat.com> 7 */ 8 9 #include <linux/acpi.h> 10 #include <linux/bits.h> 11 #include <linux/i2c.h> 12 #include <linux/interrupt.h> 13 #include <linux/kernel.h> 14 #include <linux/module.h> 15 #include <linux/platform_device.h> 16 #include <linux/property.h> 17 #include <linux/spi/spi.h> 18 #include <linux/types.h> 19 20 #define IRQ_RESOURCE_TYPE GENMASK(1, 0) 21 #define IRQ_RESOURCE_NONE 0 22 #define IRQ_RESOURCE_GPIO 1 23 #define IRQ_RESOURCE_APIC 2 24 #define IRQ_RESOURCE_AUTO 3 25 26 enum smi_bus_type { 27 SMI_I2C, 28 SMI_SPI, 29 SMI_AUTO_DETECT, 30 }; 31 32 struct smi_instance { 33 const char *type; 34 unsigned int flags; 35 int irq_idx; 36 }; 37 38 struct smi_node { 39 enum smi_bus_type bus_type; 40 struct smi_instance instances[]; 41 }; 42 43 struct smi { 44 int i2c_num; 45 int spi_num; 46 struct i2c_client **i2c_devs; 47 struct spi_device **spi_devs; 48 }; 49 50 static int smi_get_irq(struct platform_device *pdev, struct acpi_device *adev, 51 const struct smi_instance *inst) 52 { 53 int ret; 54 55 switch (inst->flags & IRQ_RESOURCE_TYPE) { 56 case IRQ_RESOURCE_AUTO: 57 ret = acpi_dev_gpio_irq_get(adev, inst->irq_idx); 58 if (ret > 0) { 59 dev_dbg(&pdev->dev, "Using gpio irq\n"); 60 break; 61 } 62 ret = platform_get_irq(pdev, inst->irq_idx); 63 if (ret > 0) { 64 dev_dbg(&pdev->dev, "Using platform irq\n"); 65 break; 66 } 67 break; 68 case IRQ_RESOURCE_GPIO: 69 ret = acpi_dev_gpio_irq_get(adev, inst->irq_idx); 70 break; 71 case IRQ_RESOURCE_APIC: 72 ret = platform_get_irq(pdev, inst->irq_idx); 73 break; 74 default: 75 return 0; 76 } 77 if (ret < 0) 78 return dev_err_probe(&pdev->dev, ret, "Error requesting irq at index %d\n", 79 inst->irq_idx); 80 81 return ret; 82 } 83 84 static void smi_devs_unregister(struct smi *smi) 85 { 86 #if IS_REACHABLE(CONFIG_I2C) 87 while (smi->i2c_num--) 88 i2c_unregister_device(smi->i2c_devs[smi->i2c_num]); 89 #endif 90 91 if (IS_REACHABLE(CONFIG_SPI)) { 92 while (smi->spi_num--) 93 spi_unregister_device(smi->spi_devs[smi->spi_num]); 94 } 95 } 96 97 /** 98 * smi_spi_probe - Instantiate multiple SPI devices from inst array 99 * @pdev: Platform device 100 * @smi: Internal struct for Serial multi instantiate driver 101 * @inst_array: Array of instances to probe 102 * 103 * Returns the number of SPI devices instantiate, Zero if none is found or a negative error code. 104 */ 105 static int smi_spi_probe(struct platform_device *pdev, struct smi *smi, 106 const struct smi_instance *inst_array) 107 { 108 struct device *dev = &pdev->dev; 109 struct acpi_device *adev = ACPI_COMPANION(dev); 110 struct spi_controller *ctlr; 111 struct spi_device *spi_dev; 112 char name[50]; 113 int i, ret, count; 114 115 ret = acpi_spi_count_resources(adev); 116 if (ret < 0) 117 return ret; 118 if (!ret) 119 return -ENOENT; 120 121 count = ret; 122 123 smi->spi_devs = devm_kcalloc(dev, count, sizeof(*smi->spi_devs), GFP_KERNEL); 124 if (!smi->spi_devs) 125 return -ENOMEM; 126 127 for (i = 0; i < count && inst_array[i].type; i++) { 128 129 spi_dev = acpi_spi_device_alloc(NULL, adev, i); 130 if (IS_ERR(spi_dev)) { 131 ret = dev_err_probe(dev, PTR_ERR(spi_dev), "failed to allocate SPI device %s from ACPI\n", 132 dev_name(&adev->dev)); 133 goto error; 134 } 135 136 ctlr = spi_dev->controller; 137 138 strscpy(spi_dev->modalias, inst_array[i].type); 139 140 ret = smi_get_irq(pdev, adev, &inst_array[i]); 141 if (ret < 0) { 142 spi_dev_put(spi_dev); 143 goto error; 144 } 145 spi_dev->irq = ret; 146 147 snprintf(name, sizeof(name), "%s-%s-%s.%d", dev_name(&ctlr->dev), dev_name(dev), 148 inst_array[i].type, i); 149 spi_dev->dev.init_name = name; 150 151 ret = spi_add_device(spi_dev); 152 if (ret) { 153 dev_err_probe(&ctlr->dev, ret, "failed to add SPI device %s from ACPI\n", 154 dev_name(&adev->dev)); 155 spi_dev_put(spi_dev); 156 goto error; 157 } 158 159 dev_dbg(dev, "SPI device %s using chip select %u", name, 160 spi_get_chipselect(spi_dev, 0)); 161 162 smi->spi_devs[i] = spi_dev; 163 smi->spi_num++; 164 } 165 166 if (smi->spi_num < count) { 167 dev_dbg(dev, "Error finding driver, idx %d\n", i); 168 ret = -ENODEV; 169 goto error; 170 } 171 172 dev_info(dev, "Instantiated %d SPI devices.\n", smi->spi_num); 173 174 return 0; 175 error: 176 smi_devs_unregister(smi); 177 178 return ret; 179 } 180 181 /** 182 * smi_i2c_probe - Instantiate multiple I2C devices from inst array 183 * @pdev: Platform device 184 * @smi: Internal struct for Serial multi instantiate driver 185 * @inst_array: Array of instances to probe 186 * 187 * Returns the number of I2C devices instantiate, Zero if none is found or a negative error code. 188 */ 189 static int smi_i2c_probe(struct platform_device *pdev, struct smi *smi, 190 const struct smi_instance *inst_array) 191 { 192 struct i2c_board_info board_info = {}; 193 struct device *dev = &pdev->dev; 194 struct acpi_device *adev = ACPI_COMPANION(dev); 195 char name[32]; 196 int i, ret, count; 197 198 ret = i2c_acpi_client_count(adev); 199 if (ret < 0) 200 return ret; 201 if (!ret) 202 return -ENOENT; 203 204 count = ret; 205 206 smi->i2c_devs = devm_kcalloc(dev, count, sizeof(*smi->i2c_devs), GFP_KERNEL); 207 if (!smi->i2c_devs) 208 return -ENOMEM; 209 210 for (i = 0; i < count && inst_array[i].type; i++) { 211 memset(&board_info, 0, sizeof(board_info)); 212 strscpy(board_info.type, inst_array[i].type); 213 snprintf(name, sizeof(name), "%s-%s.%d", dev_name(dev), inst_array[i].type, i); 214 board_info.dev_name = name; 215 216 ret = smi_get_irq(pdev, adev, &inst_array[i]); 217 if (ret < 0) 218 goto error; 219 board_info.irq = ret; 220 221 smi->i2c_devs[i] = i2c_acpi_new_device(dev, i, &board_info); 222 if (IS_ERR(smi->i2c_devs[i])) { 223 ret = dev_err_probe(dev, PTR_ERR(smi->i2c_devs[i]), 224 "Error creating i2c-client, idx %d\n", i); 225 goto error; 226 } 227 smi->i2c_num++; 228 } 229 if (smi->i2c_num < count) { 230 dev_dbg(dev, "Error finding driver, idx %d\n", i); 231 ret = -ENODEV; 232 goto error; 233 } 234 235 dev_info(dev, "Instantiated %d I2C devices.\n", smi->i2c_num); 236 237 return 0; 238 error: 239 smi_devs_unregister(smi); 240 241 return ret; 242 } 243 244 static int smi_probe(struct platform_device *pdev) 245 { 246 struct device *dev = &pdev->dev; 247 const struct smi_node *node; 248 struct smi *smi; 249 int ret; 250 251 node = device_get_match_data(dev); 252 if (!node) { 253 dev_dbg(dev, "Error ACPI match data is missing\n"); 254 return -ENODEV; 255 } 256 257 smi = devm_kzalloc(dev, sizeof(*smi), GFP_KERNEL); 258 if (!smi) 259 return -ENOMEM; 260 261 platform_set_drvdata(pdev, smi); 262 263 switch (node->bus_type) { 264 case SMI_I2C: 265 if (IS_REACHABLE(CONFIG_I2C)) 266 return smi_i2c_probe(pdev, smi, node->instances); 267 268 return -ENODEV; 269 case SMI_SPI: 270 if (IS_REACHABLE(CONFIG_SPI)) 271 return smi_spi_probe(pdev, smi, node->instances); 272 273 return -ENODEV; 274 case SMI_AUTO_DETECT: 275 /* 276 * For backwards-compatibility with the existing nodes I2C 277 * is checked first and if such entries are found ONLY I2C 278 * devices are created. Since some existing nodes that were 279 * already handled by this driver could also contain unrelated 280 * SpiSerialBus nodes that were previously ignored, and this 281 * preserves that behavior. 282 */ 283 if (IS_REACHABLE(CONFIG_I2C)) { 284 ret = smi_i2c_probe(pdev, smi, node->instances); 285 if (ret != -ENOENT) 286 return ret; 287 } 288 289 if (IS_REACHABLE(CONFIG_SPI)) 290 return smi_spi_probe(pdev, smi, node->instances); 291 292 return -ENODEV; 293 default: 294 return -EINVAL; 295 } 296 } 297 298 static void smi_remove(struct platform_device *pdev) 299 { 300 struct smi *smi = platform_get_drvdata(pdev); 301 302 smi_devs_unregister(smi); 303 } 304 305 static const struct smi_node bsg1160_data = { 306 .instances = { 307 { "bmc150_accel", IRQ_RESOURCE_GPIO, 0 }, 308 { "bmc150_magn" }, 309 { "bmg160" }, 310 {} 311 }, 312 .bus_type = SMI_I2C, 313 }; 314 315 static const struct smi_node bsg2150_data = { 316 .instances = { 317 { "bmc150_accel", IRQ_RESOURCE_GPIO, 0 }, 318 { "bmc150_magn" }, 319 /* The resources describe a 3th client, but it is not really there. */ 320 { "bsg2150_dummy_dev" }, 321 {} 322 }, 323 .bus_type = SMI_I2C, 324 }; 325 326 static const struct smi_node int3515_data = { 327 .instances = { 328 { "tps6598x", IRQ_RESOURCE_APIC, 0 }, 329 { "tps6598x", IRQ_RESOURCE_APIC, 1 }, 330 { "tps6598x", IRQ_RESOURCE_APIC, 2 }, 331 { "tps6598x", IRQ_RESOURCE_APIC, 3 }, 332 {} 333 }, 334 .bus_type = SMI_I2C, 335 }; 336 337 static const struct smi_node cs35l41_hda = { 338 .instances = { 339 { "cs35l41-hda", IRQ_RESOURCE_AUTO, 0 }, 340 { "cs35l41-hda", IRQ_RESOURCE_AUTO, 0 }, 341 { "cs35l41-hda", IRQ_RESOURCE_AUTO, 0 }, 342 { "cs35l41-hda", IRQ_RESOURCE_AUTO, 0 }, 343 {} 344 }, 345 .bus_type = SMI_AUTO_DETECT, 346 }; 347 348 static const struct smi_node cs35l54_hda = { 349 .instances = { 350 { "cs35l54-hda", IRQ_RESOURCE_AUTO, 0 }, 351 { "cs35l54-hda", IRQ_RESOURCE_AUTO, 0 }, 352 { "cs35l54-hda", IRQ_RESOURCE_AUTO, 0 }, 353 { "cs35l54-hda", IRQ_RESOURCE_AUTO, 0 }, 354 /* a 5th entry is an alias address, not a real device */ 355 { "cs35l54-hda_dummy_dev" }, 356 {} 357 }, 358 .bus_type = SMI_AUTO_DETECT, 359 }; 360 361 static const struct smi_node cs35l56_hda = { 362 .instances = { 363 { "cs35l56-hda", IRQ_RESOURCE_AUTO, 0 }, 364 { "cs35l56-hda", IRQ_RESOURCE_AUTO, 0 }, 365 { "cs35l56-hda", IRQ_RESOURCE_AUTO, 0 }, 366 { "cs35l56-hda", IRQ_RESOURCE_AUTO, 0 }, 367 /* a 5th entry is an alias address, not a real device */ 368 { "cs35l56-hda_dummy_dev" }, 369 {} 370 }, 371 .bus_type = SMI_AUTO_DETECT, 372 }; 373 374 static const struct smi_node cs35l57_hda = { 375 .instances = { 376 { "cs35l57-hda", IRQ_RESOURCE_AUTO, 0 }, 377 { "cs35l57-hda", IRQ_RESOURCE_AUTO, 0 }, 378 { "cs35l57-hda", IRQ_RESOURCE_AUTO, 0 }, 379 { "cs35l57-hda", IRQ_RESOURCE_AUTO, 0 }, 380 /* a 5th entry is an alias address, not a real device */ 381 { "cs35l57-hda_dummy_dev" }, 382 {} 383 }, 384 .bus_type = SMI_AUTO_DETECT, 385 }; 386 387 /* 388 * Note new device-ids must also be added to ignore_serial_bus_ids in 389 * drivers/acpi/scan.c: acpi_device_enumeration_by_parent(). 390 */ 391 static const struct acpi_device_id smi_acpi_ids[] = { 392 { "BSG1160", (unsigned long)&bsg1160_data }, 393 { "BSG2150", (unsigned long)&bsg2150_data }, 394 { "CSC3551", (unsigned long)&cs35l41_hda }, 395 { "CSC3554", (unsigned long)&cs35l54_hda }, 396 { "CSC3556", (unsigned long)&cs35l56_hda }, 397 { "CSC3557", (unsigned long)&cs35l57_hda }, 398 { "INT3515", (unsigned long)&int3515_data }, 399 /* Non-conforming _HID for Cirrus Logic already released */ 400 { "CLSA0100", (unsigned long)&cs35l41_hda }, 401 { "CLSA0101", (unsigned long)&cs35l41_hda }, 402 { } 403 }; 404 MODULE_DEVICE_TABLE(acpi, smi_acpi_ids); 405 406 static struct platform_driver smi_driver = { 407 .driver = { 408 .name = "Serial bus multi instantiate pseudo device driver", 409 .acpi_match_table = smi_acpi_ids, 410 }, 411 .probe = smi_probe, 412 .remove = smi_remove, 413 }; 414 module_platform_driver(smi_driver); 415 416 MODULE_DESCRIPTION("Serial multi instantiate pseudo device driver"); 417 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>"); 418 MODULE_LICENSE("GPL"); 419