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path: root/drivers/pinctrl/pinctrl-mcp23s08_i2c.c
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Diffstat (limited to 'drivers/pinctrl/pinctrl-mcp23s08_i2c.c')
-rw-r--r--drivers/pinctrl/pinctrl-mcp23s08_i2c.c125
1 files changed, 125 insertions, 0 deletions
diff --git a/drivers/pinctrl/pinctrl-mcp23s08_i2c.c b/drivers/pinctrl/pinctrl-mcp23s08_i2c.c
new file mode 100644
index 0000000000..3dd1bd8e73
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-mcp23s08_i2c.c
@@ -0,0 +1,125 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* MCP23S08 I2C GPIO driver */
+
+#include <linux/i2c.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+
+#include "pinctrl-mcp23s08.h"
+
+static int mcp230xx_probe(struct i2c_client *client)
+{
+ const struct i2c_device_id *id = i2c_client_get_device_id(client);
+ struct device *dev = &client->dev;
+ unsigned int type = id->driver_data;
+ struct mcp23s08 *mcp;
+ int ret;
+
+ mcp = devm_kzalloc(dev, sizeof(*mcp), GFP_KERNEL);
+ if (!mcp)
+ return -ENOMEM;
+
+ switch (type) {
+ case MCP_TYPE_008:
+ mcp->regmap = devm_regmap_init_i2c(client, &mcp23x08_regmap);
+ mcp->reg_shift = 0;
+ mcp->chip.ngpio = 8;
+ mcp->chip.label = "mcp23008";
+ break;
+
+ case MCP_TYPE_017:
+ mcp->regmap = devm_regmap_init_i2c(client, &mcp23x17_regmap);
+ mcp->reg_shift = 1;
+ mcp->chip.ngpio = 16;
+ mcp->chip.label = "mcp23017";
+ break;
+
+ case MCP_TYPE_018:
+ mcp->regmap = devm_regmap_init_i2c(client, &mcp23x17_regmap);
+ mcp->reg_shift = 1;
+ mcp->chip.ngpio = 16;
+ mcp->chip.label = "mcp23018";
+ break;
+
+ default:
+ dev_err(dev, "invalid device type (%d)\n", type);
+ return -EINVAL;
+ }
+
+ if (IS_ERR(mcp->regmap))
+ return PTR_ERR(mcp->regmap);
+
+ mcp->irq = client->irq;
+ mcp->pinctrl_desc.name = "mcp23xxx-pinctrl";
+
+ ret = mcp23s08_probe_one(mcp, dev, client->addr, type, -1);
+ if (ret)
+ return ret;
+
+ i2c_set_clientdata(client, mcp);
+
+ return 0;
+}
+
+static const struct i2c_device_id mcp230xx_id[] = {
+ { "mcp23008", MCP_TYPE_008 },
+ { "mcp23017", MCP_TYPE_017 },
+ { "mcp23018", MCP_TYPE_018 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, mcp230xx_id);
+
+static const struct of_device_id mcp23s08_i2c_of_match[] = {
+ {
+ .compatible = "microchip,mcp23008",
+ .data = (void *) MCP_TYPE_008,
+ },
+ {
+ .compatible = "microchip,mcp23017",
+ .data = (void *) MCP_TYPE_017,
+ },
+ {
+ .compatible = "microchip,mcp23018",
+ .data = (void *) MCP_TYPE_018,
+ },
+/* NOTE: The use of the mcp prefix is deprecated and will be removed. */
+ {
+ .compatible = "mcp,mcp23008",
+ .data = (void *) MCP_TYPE_008,
+ },
+ {
+ .compatible = "mcp,mcp23017",
+ .data = (void *) MCP_TYPE_017,
+ },
+ { }
+};
+MODULE_DEVICE_TABLE(of, mcp23s08_i2c_of_match);
+
+static struct i2c_driver mcp230xx_driver = {
+ .driver = {
+ .name = "mcp230xx",
+ .of_match_table = mcp23s08_i2c_of_match,
+ },
+ .probe = mcp230xx_probe,
+ .id_table = mcp230xx_id,
+};
+
+static int __init mcp23s08_i2c_init(void)
+{
+ return i2c_add_driver(&mcp230xx_driver);
+}
+
+/*
+ * Register after I²C postcore initcall and before
+ * subsys initcalls that may rely on these GPIOs.
+ */
+subsys_initcall(mcp23s08_i2c_init);
+
+static void mcp23s08_i2c_exit(void)
+{
+ i2c_del_driver(&mcp230xx_driver);
+}
+module_exit(mcp23s08_i2c_exit);
+
+MODULE_LICENSE("GPL");