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