only for test

Author: joan-na-good

drivers/regulator/Makefile

@@ -203,4 +203,6 @@ obj-$(CONFIG_REGULATOR_WM8350) += wm8350-regulator.o
 obj-$(CONFIG_REGULATOR_WM8400) += wm8400-regulator.o
 obj-$(CONFIG_REGULATOR_WM8994) += wm8994-regulator.o
 
+obj-y += max77675-regulator.o
+
 ccflags-$(CONFIG_REGULATOR_DEBUG) += -DDEBUG

drivers/regulator/max77675-regulator.c

@@ -0,0 +1,100 @@
+// max77675.c
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/regulator/driver.h>
+#include <linux/of_device.h>
+#include <linux/regmap.h>
+
+#define MAX77675_NUM_REGULATORS 4
+
+struct max77675_regulator {
+    struct device *dev;
+    struct regulator_dev *rdev[MAX77675_NUM_REGULATORS];
+    struct regmap *regmap;
+};
+
+static const struct regulator_ops max77675_regulator_ops = {
+    .enable     = regulator_enable_regmap,
+    .disable    = regulator_disable_regmap,
+    .is_enabled = regulator_is_enabled_regmap,
+    .set_voltage_sel = regulator_set_voltage_sel_regmap,
+    .get_voltage_sel = regulator_get_voltage_sel_regmap,
+};
+
+static const struct regulator_desc max77675_regulators[] = {
+    {
+        .name = "simo0",
+        .id = 0,
+        .ops = &max77675_regulator_ops,
+        .type = REGULATOR_VOLTAGE,
+        .owner = THIS_MODULE,
+        .n_voltages = 64,
+        .min_uV = 500000,
+        .uV_step = 50000,
+        .vsel_reg = 0x10,   // example value : SIMO0 VOUT
+        .vsel_mask = 0x3F,
+        .enable_reg = 0x20, // example value :  SIMO0 ENABLE
+        .enable_mask = 0x01,
+    },
+    // simo1, simo2, simo3 
+};
+
+static int max77675_probe(struct i2c_client *client, const struct i2c_device_id *id)
+{
+    struct max77675_regulator *priv;
+    int i, ret;
+
+    priv = devm_kzalloc(&client->dev, sizeof(*priv), GFP_KERNEL);
+    if (!priv)
+        return -ENOMEM;
+
+    i2c_set_clientdata(client, priv);
+
+    priv->regmap = devm_regmap_init_i2c(client, &some_regmap_config);
+    if (IS_ERR(priv->regmap))
+        return dev_err_probe(&client->dev, PTR_ERR(priv->regmap), "regmap init failed");
+
+    for (i = 0; i < MAX77675_NUM_REGULATORS; i++) {
+        struct regulator_config config = {};
+        config.dev = &client->dev;
+        config.regmap = priv->regmap;
+
+        priv->rdev[i] = devm_regulator_register(&client->dev,
+                                                &max77675_regulators[i], &config);
+        if (IS_ERR(priv->rdev[i])) {
+            dev_err(&client->dev, "Failed to register regulator %d\n", i);
+            return PTR_ERR(priv->rdev[i]);
+        }
+    }
+
+    dev_info(&client->dev, "MAX77675 regulator driver loaded\n");
+    return 0;
+}
+
+static const struct of_device_id max77675_of_match[] = {
+    { .compatible = "maxim,max77675", },
+    { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, max77675_of_match);
+
+static const struct i2c_device_id max77675_id[] = {
+    { "max77675", 0 },
+    { }
+};
+MODULE_DEVICE_TABLE(i2c, max77675_id);
+
+static struct i2c_driver max77675_driver = {
+    .driver = {
+        .name = "max77675",
+        .of_match_table = max77675_of_match,
+    },
+    .probe = max77675_probe,
+    .id_table = max77675_id,
+};
+
+module_i2c_driver(max77675_driver);
+
+MODULE_AUTHOR("joan.na@analog.com");
+MODULE_DESCRIPTION("MAX77675 Regulator Driver");
+MODULE_LICENSE("GPL");
+