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path: root/drivers/base/regmap/regmap-sccb.c
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Diffstat (limited to 'drivers/base/regmap/regmap-sccb.c')
-rw-r--r--drivers/base/regmap/regmap-sccb.c128
1 files changed, 128 insertions, 0 deletions
diff --git a/drivers/base/regmap/regmap-sccb.c b/drivers/base/regmap/regmap-sccb.c
new file mode 100644
index 000000000000..597042e2d009
--- /dev/null
+++ b/drivers/base/regmap/regmap-sccb.c
@@ -0,0 +1,128 @@
+// SPDX-License-Identifier: GPL-2.0
+// Register map access API - SCCB support
+
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+
+#include "internal.h"
+
+/**
+ * sccb_is_available - Check if the adapter supports SCCB protocol
+ * @adap: I2C adapter
+ *
+ * Return true if the I2C adapter is capable of using SCCB helper functions,
+ * false otherwise.
+ */
+static bool sccb_is_available(struct i2c_adapter *adap)
+{
+ u32 needed_funcs = I2C_FUNC_SMBUS_BYTE | I2C_FUNC_SMBUS_WRITE_BYTE_DATA;
+
+ /*
+ * If we ever want support for hardware doing SCCB natively, we will
+ * introduce a sccb_xfer() callback to struct i2c_algorithm and check
+ * for it here.
+ */
+
+ return (i2c_get_functionality(adap) & needed_funcs) == needed_funcs;
+}
+
+/**
+ * regmap_sccb_read - Read data from SCCB slave device
+ * @context: Device that will be interacted with
+ * @reg: Register to be read from
+ * @val: Pointer to store read value
+ *
+ * This executes the 2-phase write transmission cycle that is followed by a
+ * 2-phase read transmission cycle, returning negative errno else zero on
+ * success.
+ */
+static int regmap_sccb_read(void *context, unsigned int reg, unsigned int *val)
+{
+ struct device *dev = context;
+ struct i2c_client *i2c = to_i2c_client(dev);
+ int ret;
+ union i2c_smbus_data data;
+
+ i2c_lock_bus(i2c->adapter, I2C_LOCK_SEGMENT);
+
+ ret = __i2c_smbus_xfer(i2c->adapter, i2c->addr, i2c->flags,
+ I2C_SMBUS_WRITE, reg, I2C_SMBUS_BYTE, NULL);
+ if (ret < 0)
+ goto out;
+
+ ret = __i2c_smbus_xfer(i2c->adapter, i2c->addr, i2c->flags,
+ I2C_SMBUS_READ, 0, I2C_SMBUS_BYTE, &data);
+ if (ret < 0)
+ goto out;
+
+ *val = data.byte;
+out:
+ i2c_unlock_bus(i2c->adapter, I2C_LOCK_SEGMENT);
+
+ return ret;
+}
+
+/**
+ * regmap_sccb_write - Write data to SCCB slave device
+ * @context: Device that will be interacted with
+ * @reg: Register to write to
+ * @val: Value to be written
+ *
+ * This executes the SCCB 3-phase write transmission cycle, returning negative
+ * errno else zero on success.
+ */
+static int regmap_sccb_write(void *context, unsigned int reg, unsigned int val)
+{
+ struct device *dev = context;
+ struct i2c_client *i2c = to_i2c_client(dev);
+
+ return i2c_smbus_write_byte_data(i2c, reg, val);
+}
+
+static struct regmap_bus regmap_sccb_bus = {
+ .reg_write = regmap_sccb_write,
+ .reg_read = regmap_sccb_read,
+};
+
+static const struct regmap_bus *regmap_get_sccb_bus(struct i2c_client *i2c,
+ const struct regmap_config *config)
+{
+ if (config->val_bits == 8 && config->reg_bits == 8 &&
+ sccb_is_available(i2c->adapter))
+ return &regmap_sccb_bus;
+
+ return ERR_PTR(-ENOTSUPP);
+}
+
+struct regmap *__regmap_init_sccb(struct i2c_client *i2c,
+ const struct regmap_config *config,
+ struct lock_class_key *lock_key,
+ const char *lock_name)
+{
+ const struct regmap_bus *bus = regmap_get_sccb_bus(i2c, config);
+
+ if (IS_ERR(bus))
+ return ERR_CAST(bus);
+
+ return __regmap_init(&i2c->dev, bus, &i2c->dev, config,
+ lock_key, lock_name);
+}
+EXPORT_SYMBOL_GPL(__regmap_init_sccb);
+
+struct regmap *__devm_regmap_init_sccb(struct i2c_client *i2c,
+ const struct regmap_config *config,
+ struct lock_class_key *lock_key,
+ const char *lock_name)
+{
+ const struct regmap_bus *bus = regmap_get_sccb_bus(i2c, config);
+
+ if (IS_ERR(bus))
+ return ERR_CAST(bus);
+
+ return __devm_regmap_init(&i2c->dev, bus, &i2c->dev, config,
+ lock_key, lock_name);
+}
+EXPORT_SYMBOL_GPL(__devm_regmap_init_sccb);
+
+MODULE_LICENSE("GPL v2");