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path: root/drivers/gpio/gpio-ds4520.c
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Diffstat (limited to 'drivers/gpio/gpio-ds4520.c')
-rw-r--r--drivers/gpio/gpio-ds4520.c80
1 files changed, 80 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-ds4520.c b/drivers/gpio/gpio-ds4520.c
new file mode 100644
index 0000000000..1903deaef3
--- /dev/null
+++ b/drivers/gpio/gpio-ds4520.c
@@ -0,0 +1,80 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2023 Analog Devices, Inc.
+ * Driver for the DS4520 I/O Expander
+ */
+
+#include <linux/device.h>
+#include <linux/gpio/driver.h>
+#include <linux/gpio/regmap.h>
+#include <linux/i2c.h>
+#include <linux/property.h>
+#include <linux/regmap.h>
+
+#define DS4520_PULLUP0 0xF0
+#define DS4520_IO_CONTROL0 0xF2
+#define DS4520_IO_STATUS0 0xF8
+
+static const struct regmap_config ds4520_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+};
+
+static int ds4520_gpio_probe(struct i2c_client *client)
+{
+ struct gpio_regmap_config config = { };
+ struct device *dev = &client->dev;
+ struct regmap *regmap;
+ u32 ngpio;
+ u32 base;
+ int ret;
+
+ ret = device_property_read_u32(dev, "reg", &base);
+ if (ret)
+ return dev_err_probe(dev, ret, "Missing 'reg' property.\n");
+
+ ret = device_property_read_u32(dev, "ngpios", &ngpio);
+ if (ret)
+ return dev_err_probe(dev, ret, "Missing 'ngpios' property.\n");
+
+ regmap = devm_regmap_init_i2c(client, &ds4520_regmap_config);
+ if (IS_ERR(regmap))
+ return dev_err_probe(dev, PTR_ERR(regmap),
+ "Failed to allocate register map\n");
+
+ config.regmap = regmap;
+ config.parent = dev;
+ config.ngpio = ngpio;
+
+ config.reg_dat_base = base + DS4520_IO_STATUS0;
+ config.reg_set_base = base + DS4520_PULLUP0;
+ config.reg_dir_out_base = base + DS4520_IO_CONTROL0;
+
+ return PTR_ERR_OR_ZERO(devm_gpio_regmap_register(dev, &config));
+}
+
+static const struct of_device_id ds4520_gpio_of_match_table[] = {
+ { .compatible = "adi,ds4520-gpio" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, ds4520_gpio_of_match_table);
+
+static const struct i2c_device_id ds4520_gpio_id_table[] = {
+ { "ds4520-gpio" },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, ds4520_gpio_id_table);
+
+static struct i2c_driver ds4520_gpio_driver = {
+ .driver = {
+ .name = "ds4520-gpio",
+ .of_match_table = ds4520_gpio_of_match_table,
+ },
+ .probe = ds4520_gpio_probe,
+ .id_table = ds4520_gpio_id_table,
+};
+module_i2c_driver(ds4520_gpio_driver);
+
+MODULE_DESCRIPTION("DS4520 I/O Expander");
+MODULE_AUTHOR("Okan Sahin <okan.sahin@analog.com>");
+MODULE_LICENSE("GPL");