// SPDX-License-Identifier: GPL-2.0+ /* * Serial multi-instantiate driver, pseudo driver to instantiate multiple * client devices from a single fwnode. * * Copyright 2018 Hans de Goede */ #include #include #include #include #include #include #include #include #include #include #define IRQ_RESOURCE_TYPE GENMASK(1, 0) #define IRQ_RESOURCE_NONE 0 #define IRQ_RESOURCE_GPIO 1 #define IRQ_RESOURCE_APIC 2 enum smi_bus_type { SMI_I2C, SMI_SPI, SMI_AUTO_DETECT, }; struct smi_instance { const char *type; unsigned int flags; int irq_idx; }; struct smi_node { enum smi_bus_type bus_type; struct smi_instance instances[]; }; struct smi { int i2c_num; int spi_num; struct i2c_client **i2c_devs; struct spi_device **spi_devs; }; static int smi_get_irq(struct platform_device *pdev, struct acpi_device *adev, const struct smi_instance *inst) { int ret; switch (inst->flags & IRQ_RESOURCE_TYPE) { case IRQ_RESOURCE_GPIO: ret = acpi_dev_gpio_irq_get(adev, inst->irq_idx); break; case IRQ_RESOURCE_APIC: ret = platform_get_irq(pdev, inst->irq_idx); break; default: return 0; } if (ret < 0) dev_err_probe(&pdev->dev, ret, "Error requesting irq at index %d: %d\n", inst->irq_idx, ret); return ret; } static void smi_devs_unregister(struct smi *smi) { while (smi->i2c_num > 0) i2c_unregister_device(smi->i2c_devs[--smi->i2c_num]); while (smi->spi_num > 0) spi_unregister_device(smi->spi_devs[--smi->spi_num]); } /** * smi_spi_probe - Instantiate multiple SPI devices from inst array * @pdev: Platform device * @adev: ACPI device * @smi: Internal struct for Serial multi instantiate driver * @inst_array: Array of instances to probe * * Returns the number of SPI devices instantiate, Zero if none is found or a negative error code. */ static int smi_spi_probe(struct platform_device *pdev, struct acpi_device *adev, struct smi *smi, const struct smi_instance *inst_array) { struct device *dev = &pdev->dev; struct spi_controller *ctlr; struct spi_device *spi_dev; char name[50]; int i, ret, count; ret = acpi_spi_count_resources(adev); if (ret < 0) return ret; else if (!ret) return -ENODEV; count = ret; smi->spi_devs = devm_kcalloc(dev, count, sizeof(*smi->spi_devs), GFP_KERNEL); if (!smi->spi_devs) return -ENOMEM; for (i = 0; i < count && inst_array[i].type; i++) { spi_dev = acpi_spi_device_alloc(NULL, adev, i); if (IS_ERR(spi_dev)) { ret = PTR_ERR(spi_dev); dev_err_probe(dev, ret, "failed to allocate SPI device %s from ACPI: %d\n", dev_name(&adev->dev), ret); goto error; } ctlr = spi_dev->controller; strscpy(spi_dev->modalias, inst_array[i].type, sizeof(spi_dev->modalias)); ret = smi_get_irq(pdev, adev, &inst_array[i]); if (ret < 0) { spi_dev_put(spi_dev); goto error; } spi_dev->irq = ret; snprintf(name, sizeof(name), "%s-%s-%s.%d", dev_name(&ctlr->dev), dev_name(dev), inst_array[i].type, i); spi_dev->dev.init_name = name; ret = spi_add_device(spi_dev); if (ret) { dev_err_probe(&ctlr->dev, ret, "failed to add SPI device %s from ACPI: %d\n", dev_name(&adev->dev), ret); spi_dev_put(spi_dev); goto error; } dev_dbg(dev, "SPI device %s using chip select %u", name, spi_dev->chip_select); smi->spi_devs[i] = spi_dev; smi->spi_num++; } if (smi->spi_num < count) { dev_dbg(dev, "Error finding driver, idx %d\n", i); ret = -ENODEV; goto error; } dev_info(dev, "Instantiated %d SPI devices.\n", smi->spi_num); return 0; error: smi_devs_unregister(smi); return ret; } /** * smi_i2c_probe - Instantiate multiple I2C devices from inst array * @pdev: Platform device * @adev: ACPI device * @smi: Internal struct for Serial multi instantiate driver * @inst_array: Array of instances to probe * * Returns the number of I2C devices instantiate, Zero if none is found or a negative error code. */ static int smi_i2c_probe(struct platform_device *pdev, struct acpi_device *adev, struct smi *smi, const struct smi_instance *inst_array) { struct i2c_board_info board_info = {}; struct device *dev = &pdev->dev; char name[32]; int i, ret, count; ret = i2c_acpi_client_count(adev); if (ret < 0) return ret; else if (!ret) return -ENODEV; count = ret; smi->i2c_devs = devm_kcalloc(dev, count, sizeof(*smi->i2c_devs), GFP_KERNEL); if (!smi->i2c_devs) return -ENOMEM; for (i = 0; i < count && inst_array[i].type; i++) { memset(&board_info, 0, sizeof(board_info)); strscpy(board_info.type, inst_array[i].type, I2C_NAME_SIZE); snprintf(name, sizeof(name), "%s-%s.%d", dev_name(dev), inst_array[i].type, i); board_info.dev_name = name; ret = smi_get_irq(pdev, adev, &inst_array[i]); if (ret < 0) goto error; board_info.irq = ret; smi->i2c_devs[i] = i2c_acpi_new_device(dev, i, &board_info); if (IS_ERR(smi->i2c_devs[i])) { ret = dev_err_probe(dev, PTR_ERR(smi->i2c_devs[i]), "Error creating i2c-client, idx %d\n", i); goto error; } smi->i2c_num++; } if (smi->i2c_num < count) { dev_dbg(dev, "Error finding driver, idx %d\n", i); ret = -ENODEV; goto error; } dev_info(dev, "Instantiated %d I2C devices.\n", smi->i2c_num); return 0; error: smi_devs_unregister(smi); return ret; } static int smi_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; const struct smi_node *node; struct acpi_device *adev; struct smi *smi; adev = ACPI_COMPANION(dev); if (!adev) return -ENODEV; node = device_get_match_data(dev); if (!node) { dev_dbg(dev, "Error ACPI match data is missing\n"); return -ENODEV; } smi = devm_kzalloc(dev, sizeof(*smi), GFP_KERNEL); if (!smi) return -ENOMEM; platform_set_drvdata(pdev, smi); switch (node->bus_type) { case SMI_I2C: return smi_i2c_probe(pdev, adev, smi, node->instances); case SMI_SPI: return smi_spi_probe(pdev, adev, smi, node->instances); case SMI_AUTO_DETECT: if (i2c_acpi_client_count(adev) > 0) return smi_i2c_probe(pdev, adev, smi, node->instances); else return smi_spi_probe(pdev, adev, smi, node->instances); default: return -EINVAL; } return 0; /* never reached */ } static int smi_remove(struct platform_device *pdev) { struct smi *smi = platform_get_drvdata(pdev); smi_devs_unregister(smi); return 0; } static const struct smi_node bsg1160_data = { .instances = { { "bmc150_accel", IRQ_RESOURCE_GPIO, 0 }, { "bmc150_magn" }, { "bmg160" }, {} }, .bus_type = SMI_I2C, }; static const struct smi_node bsg2150_data = { .instances = { { "bmc150_accel", IRQ_RESOURCE_GPIO, 0 }, { "bmc150_magn" }, /* The resources describe a 3th client, but it is not really there. */ { "bsg2150_dummy_dev" }, {} }, .bus_type = SMI_I2C, }; static const struct smi_node int3515_data = { .instances = { { "tps6598x", IRQ_RESOURCE_APIC, 0 }, { "tps6598x", IRQ_RESOURCE_APIC, 1 }, { "tps6598x", IRQ_RESOURCE_APIC, 2 }, { "tps6598x", IRQ_RESOURCE_APIC, 3 }, {} }, .bus_type = SMI_I2C, }; static const struct smi_node cs35l41_hda = { .instances = { { "cs35l41-hda", IRQ_RESOURCE_GPIO, 0 }, { "cs35l41-hda", IRQ_RESOURCE_GPIO, 0 }, { "cs35l41-hda", IRQ_RESOURCE_GPIO, 0 }, { "cs35l41-hda", IRQ_RESOURCE_GPIO, 0 }, {} }, .bus_type = SMI_AUTO_DETECT, }; /* * Note new device-ids must also be added to ignore_serial_bus_ids in * drivers/acpi/scan.c: acpi_device_enumeration_by_parent(). */ static const struct acpi_device_id smi_acpi_ids[] = { { "BSG1160", (unsigned long)&bsg1160_data }, { "BSG2150", (unsigned long)&bsg2150_data }, { "INT3515", (unsigned long)&int3515_data }, { "CSC3551", (unsigned long)&cs35l41_hda }, /* Non-conforming _HID for Cirrus Logic already released */ { "CLSA0100", (unsigned long)&cs35l41_hda }, { "CLSA0101", (unsigned long)&cs35l41_hda }, { } }; MODULE_DEVICE_TABLE(acpi, smi_acpi_ids); static struct platform_driver smi_driver = { .driver = { .name = "Serial bus multi instantiate pseudo device driver", .acpi_match_table = smi_acpi_ids, }, .probe = smi_probe, .remove = smi_remove, }; module_platform_driver(smi_driver); MODULE_DESCRIPTION("Serial multi instantiate pseudo device driver"); MODULE_AUTHOR("Hans de Goede "); MODULE_LICENSE("GPL");