summaryrefslogtreecommitdiff
path: root/drivers/platform/x86/i2c-multi-instantiate.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/platform/x86/i2c-multi-instantiate.c')
-rw-r--r--drivers/platform/x86/i2c-multi-instantiate.c132
1 files changed, 132 insertions, 0 deletions
diff --git a/drivers/platform/x86/i2c-multi-instantiate.c b/drivers/platform/x86/i2c-multi-instantiate.c
new file mode 100644
index 000000000000..5456581b473c
--- /dev/null
+++ b/drivers/platform/x86/i2c-multi-instantiate.c
@@ -0,0 +1,132 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * I2C multi-instantiate driver, pseudo driver to instantiate multiple
+ * i2c-clients from a single fwnode.
+ *
+ * Copyright 2018 Hans de Goede <hdegoede@redhat.com>
+ */
+
+#include <linux/acpi.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+struct i2c_inst_data {
+ const char *type;
+ int gpio_irq_idx;
+};
+
+struct i2c_multi_inst_data {
+ int num_clients;
+ struct i2c_client *clients[0];
+};
+
+static int i2c_multi_inst_probe(struct platform_device *pdev)
+{
+ struct i2c_multi_inst_data *multi;
+ const struct acpi_device_id *match;
+ const struct i2c_inst_data *inst_data;
+ struct i2c_board_info board_info = {};
+ struct device *dev = &pdev->dev;
+ struct acpi_device *adev;
+ char name[32];
+ int i, ret;
+
+ match = acpi_match_device(dev->driver->acpi_match_table, dev);
+ if (!match) {
+ dev_err(dev, "Error ACPI match data is missing\n");
+ return -ENODEV;
+ }
+ inst_data = (const struct i2c_inst_data *)match->driver_data;
+
+ adev = ACPI_COMPANION(dev);
+
+ /* Count number of clients to instantiate */
+ for (i = 0; inst_data[i].type; i++) {}
+
+ multi = devm_kmalloc(dev,
+ offsetof(struct i2c_multi_inst_data, clients[i]),
+ GFP_KERNEL);
+ if (!multi)
+ return -ENOMEM;
+
+ multi->num_clients = i;
+
+ for (i = 0; i < multi->num_clients; i++) {
+ memset(&board_info, 0, sizeof(board_info));
+ strlcpy(board_info.type, inst_data[i].type, I2C_NAME_SIZE);
+ snprintf(name, sizeof(name), "%s-%s", match->id,
+ inst_data[i].type);
+ board_info.dev_name = name;
+ board_info.irq = 0;
+ if (inst_data[i].gpio_irq_idx != -1) {
+ ret = acpi_dev_gpio_irq_get(adev,
+ inst_data[i].gpio_irq_idx);
+ if (ret < 0) {
+ dev_err(dev, "Error requesting irq at index %d: %d\n",
+ inst_data[i].gpio_irq_idx, ret);
+ goto error;
+ }
+ board_info.irq = ret;
+ }
+ multi->clients[i] = i2c_acpi_new_device(dev, i, &board_info);
+ if (!multi->clients[i]) {
+ dev_err(dev, "Error creating i2c-client, idx %d\n", i);
+ ret = -ENODEV;
+ goto error;
+ }
+ }
+
+ platform_set_drvdata(pdev, multi);
+ return 0;
+
+error:
+ while (--i >= 0)
+ i2c_unregister_device(multi->clients[i]);
+
+ return ret;
+}
+
+static int i2c_multi_inst_remove(struct platform_device *pdev)
+{
+ struct i2c_multi_inst_data *multi = platform_get_drvdata(pdev);
+ int i;
+
+ for (i = 0; i < multi->num_clients; i++)
+ i2c_unregister_device(multi->clients[i]);
+
+ return 0;
+}
+
+static const struct i2c_inst_data bsg1160_data[] = {
+ { "bmc150_accel", 0 },
+ { "bmc150_magn", -1 },
+ { "bmg160", -1 },
+ {}
+};
+
+/*
+ * Note new device-ids must also be added to i2c_multi_instantiate_ids in
+ * drivers/acpi/scan.c: acpi_device_enumeration_by_parent().
+ */
+static const struct acpi_device_id i2c_multi_inst_acpi_ids[] = {
+ { "BSG1160", (unsigned long)bsg1160_data },
+ { }
+};
+MODULE_DEVICE_TABLE(acpi, i2c_multi_inst_acpi_ids);
+
+static struct platform_driver i2c_multi_inst_driver = {
+ .driver = {
+ .name = "I2C multi instantiate pseudo device driver",
+ .acpi_match_table = ACPI_PTR(i2c_multi_inst_acpi_ids),
+ },
+ .probe = i2c_multi_inst_probe,
+ .remove = i2c_multi_inst_remove,
+};
+module_platform_driver(i2c_multi_inst_driver);
+
+MODULE_DESCRIPTION("I2C multi instantiate pseudo device driver");
+MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
+MODULE_LICENSE("GPL");