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Diffstat (limited to 'drivers/base/regmap/regmap-sdw.c')
-rw-r--r--drivers/base/regmap/regmap-sdw.c102
1 files changed, 102 insertions, 0 deletions
diff --git a/drivers/base/regmap/regmap-sdw.c b/drivers/base/regmap/regmap-sdw.c
new file mode 100644
index 0000000000..159c0b740b
--- /dev/null
+++ b/drivers/base/regmap/regmap-sdw.c
@@ -0,0 +1,102 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright(c) 2015-17 Intel Corporation.
+
+#include <linux/device.h>
+#include <linux/errno.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/soundwire/sdw.h>
+#include <linux/types.h>
+#include "internal.h"
+
+static int regmap_sdw_write(void *context, const void *val_buf, size_t val_size)
+{
+ struct device *dev = context;
+ struct sdw_slave *slave = dev_to_sdw_dev(dev);
+ /* First word of buffer contains the destination address */
+ u32 addr = le32_to_cpu(*(const __le32 *)val_buf);
+ const u8 *val = val_buf;
+
+ return sdw_nwrite_no_pm(slave, addr, val_size - sizeof(addr), val + sizeof(addr));
+}
+
+static int regmap_sdw_gather_write(void *context,
+ const void *reg_buf, size_t reg_size,
+ const void *val_buf, size_t val_size)
+{
+ struct device *dev = context;
+ struct sdw_slave *slave = dev_to_sdw_dev(dev);
+ u32 addr = le32_to_cpu(*(const __le32 *)reg_buf);
+
+ return sdw_nwrite_no_pm(slave, addr, val_size, val_buf);
+}
+
+static int regmap_sdw_read(void *context,
+ const void *reg_buf, size_t reg_size,
+ void *val_buf, size_t val_size)
+{
+ struct device *dev = context;
+ struct sdw_slave *slave = dev_to_sdw_dev(dev);
+ u32 addr = le32_to_cpu(*(const __le32 *)reg_buf);
+
+ return sdw_nread_no_pm(slave, addr, val_size, val_buf);
+}
+
+static const struct regmap_bus regmap_sdw = {
+ .write = regmap_sdw_write,
+ .gather_write = regmap_sdw_gather_write,
+ .read = regmap_sdw_read,
+ .reg_format_endian_default = REGMAP_ENDIAN_LITTLE,
+ .val_format_endian_default = REGMAP_ENDIAN_LITTLE,
+};
+
+static int regmap_sdw_config_check(const struct regmap_config *config)
+{
+ /* Register addresses are 32 bits wide */
+ if (config->reg_bits != 32)
+ return -ENOTSUPP;
+
+ if (config->pad_bits != 0)
+ return -ENOTSUPP;
+
+ /* Only bulk writes are supported not multi-register writes */
+ if (config->can_multi_write)
+ return -ENOTSUPP;
+
+ return 0;
+}
+
+struct regmap *__regmap_init_sdw(struct sdw_slave *sdw,
+ const struct regmap_config *config,
+ struct lock_class_key *lock_key,
+ const char *lock_name)
+{
+ int ret;
+
+ ret = regmap_sdw_config_check(config);
+ if (ret)
+ return ERR_PTR(ret);
+
+ return __regmap_init(&sdw->dev, &regmap_sdw,
+ &sdw->dev, config, lock_key, lock_name);
+}
+EXPORT_SYMBOL_GPL(__regmap_init_sdw);
+
+struct regmap *__devm_regmap_init_sdw(struct sdw_slave *sdw,
+ const struct regmap_config *config,
+ struct lock_class_key *lock_key,
+ const char *lock_name)
+{
+ int ret;
+
+ ret = regmap_sdw_config_check(config);
+ if (ret)
+ return ERR_PTR(ret);
+
+ return __devm_regmap_init(&sdw->dev, &regmap_sdw,
+ &sdw->dev, config, lock_key, lock_name);
+}
+EXPORT_SYMBOL_GPL(__devm_regmap_init_sdw);
+
+MODULE_DESCRIPTION("Regmap SoundWire Module");
+MODULE_LICENSE("GPL v2");