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// 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 <hdegoede@redhat.com>
*/
#include <linux/acpi.h>
#include <linux/bits.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/property.h>
#include <linux/types.h>
#define IRQ_RESOURCE_TYPE GENMASK(1, 0)
#define IRQ_RESOURCE_NONE 0
#define IRQ_RESOURCE_GPIO 1
#define IRQ_RESOURCE_APIC 2
struct smi_instance {
const char *type;
unsigned int flags;
int irq_idx;
};
struct smi {
int i2c_num;
struct i2c_client **i2c_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]);
}
/**
* 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)
{
const struct smi_instance *inst_array;
struct device *dev = &pdev->dev;
struct acpi_device *adev;
struct smi *smi;
adev = ACPI_COMPANION(dev);
if (!adev)
return -ENODEV;
inst_array = device_get_match_data(dev);
if (!inst_array) {
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);
return smi_i2c_probe(pdev, adev, smi, inst_array);
}
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_instance bsg1160_data[] = {
{ "bmc150_accel", IRQ_RESOURCE_GPIO, 0 },
{ "bmc150_magn" },
{ "bmg160" },
{}
};
static const struct smi_instance bsg2150_data[] = {
{ "bmc150_accel", IRQ_RESOURCE_GPIO, 0 },
{ "bmc150_magn" },
/* The resources describe a 3th client, but it is not really there. */
{ "bsg2150_dummy_dev" },
{}
};
static const struct smi_instance int3515_data[] = {
{ "tps6598x", IRQ_RESOURCE_APIC, 0 },
{ "tps6598x", IRQ_RESOURCE_APIC, 1 },
{ "tps6598x", IRQ_RESOURCE_APIC, 2 },
{ "tps6598x", IRQ_RESOURCE_APIC, 3 },
{}
};
/*
* 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 },
{ }
};
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 <hdegoede@redhat.com>");
MODULE_LICENSE("GPL");
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