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authorVinod Koul <vinod.koul@intel.com>2018-01-08 15:50:59 +0530
committerMark Brown <broonie@kernel.org>2018-01-08 11:27:18 +0000
commit7c22ce6e218403fc8746f7915b5a391d8227f7e1 (patch)
tree6082066e21fbf68e529e5d2664cc8fa5ba0cc377 /drivers/base
parenta4887813c3a9481ab87c8a71ab1de50b975cc823 (diff)
regmap: Add SoundWire bus support
SoundWire bus provides sdw_read() and sdw_write() APIs for Slave devices to program the registers. Provide support in regmap for SoundWire bus. Signed-off-by: Hardik T Shah <hardik.t.shah@intel.com> Signed-off-by: Sanyog Kale <sanyog.r.kale@intel.com> Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com> Acked-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Reviewed-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Vinod Koul <vinod.koul@intel.com> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/regmap/Kconfig4
-rw-r--r--drivers/base/regmap/Makefile1
-rw-r--r--drivers/base/regmap/regmap-sdw.c88
3 files changed, 93 insertions, 0 deletions
diff --git a/drivers/base/regmap/Kconfig b/drivers/base/regmap/Kconfig
index 0368fd7b3a41..067073e4beb1 100644
--- a/drivers/base/regmap/Kconfig
+++ b/drivers/base/regmap/Kconfig
@@ -37,3 +37,7 @@ config REGMAP_MMIO
config REGMAP_IRQ
bool
+
+config REGMAP_SOUNDWIRE
+ tristate
+ depends on SOUNDWIRE_BUS
diff --git a/drivers/base/regmap/Makefile b/drivers/base/regmap/Makefile
index 0d298c446108..22d263cca395 100644
--- a/drivers/base/regmap/Makefile
+++ b/drivers/base/regmap/Makefile
@@ -13,3 +13,4 @@ obj-$(CONFIG_REGMAP_SPMI) += regmap-spmi.o
obj-$(CONFIG_REGMAP_MMIO) += regmap-mmio.o
obj-$(CONFIG_REGMAP_IRQ) += regmap-irq.o
obj-$(CONFIG_REGMAP_W1) += regmap-w1.o
+obj-$(CONFIG_REGMAP_SOUNDWIRE) += regmap-sdw.o
diff --git a/drivers/base/regmap/regmap-sdw.c b/drivers/base/regmap/regmap-sdw.c
new file mode 100644
index 000000000000..50a66382d87d
--- /dev/null
+++ b/drivers/base/regmap/regmap-sdw.c
@@ -0,0 +1,88 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright(c) 2015-17 Intel Corporation.
+
+#include <linux/device.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/soundwire/sdw.h>
+#include "internal.h"
+
+static int regmap_sdw_write(void *context, unsigned int reg, unsigned int val)
+{
+ struct device *dev = context;
+ struct sdw_slave *slave = dev_to_sdw_dev(dev);
+
+ return sdw_write(slave, reg, val);
+}
+
+static int regmap_sdw_read(void *context, unsigned int reg, unsigned int *val)
+{
+ struct device *dev = context;
+ struct sdw_slave *slave = dev_to_sdw_dev(dev);
+ int read;
+
+ read = sdw_read(slave, reg);
+ if (read < 0)
+ return read;
+
+ *val = read;
+ return 0;
+}
+
+static struct regmap_bus regmap_sdw = {
+ .reg_read = regmap_sdw_read,
+ .reg_write = regmap_sdw_write,
+ .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)
+{
+ /* All register are 8-bits wide as per MIPI Soundwire 1.0 Spec */
+ if (config->val_bits != 8)
+ return -ENOTSUPP;
+
+ /* Registers are 32 bits wide */
+ if (config->reg_bits != 32)
+ return -ENOTSUPP;
+
+ if (config->pad_bits != 0)
+ 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");

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