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regmap: Add support for SCCB
This is an I2C subset. -----BEGIN PGP SIGNATURE----- iQFHBAABCgAxFiEEreZoqmdXGLWf4p/qJNaLcl1Uh9AFAltPUrMTHGJyb29uaWVA a2VybmVsLm9yZwAKCRAk1otyXVSH0KODB/oDV+4c82VIUopoaXxK8PbBqDMn5n2r EKyb1D/GFiT54x2666arRT1NymL/uk6/nK1hryd/4HE5zB1lUQnu/Z7HCHgF4N+/ iWHtAgFUSZtNlMTRT6DW/tcsNDGnH9vjNJUhOLH9Y21h3Q4BpOo5HQVR8ynN4TDh 2inSy5qgADyrosxRpW5mp0Nt0tpFTfvYOHoRaLTbQUbBnpb/MmqcTzkYHcVNqA8V 7+e9/SOVU0XXHQD5k28F7eB84Mk+TXQrZQ181RwNOKUf3je86Im6WfrFqKHqKP5N UAq28AjsjRiBs1qwOYK0ytWR8gQvs39cZmdud507R1mLWEO4/++TruRt =wkUm -----END PGP SIGNATURE----- gpgsig -----BEGIN PGP SIGNATURE----- iQFHBAABCgAxFiEEreZoqmdXGLWf4p/qJNaLcl1Uh9AFAltPUyETHGJyb29uaWVA a2VybmVsLm9yZwAKCRAk1otyXVSH0CJsB/oD+83KWX8V1Q4HhaO3e6BN2SPYphQr jbImC9QUSRl/65+0ek6VjqLu4znY/LARRjNThN0l01wvWv7+h71DJBSKL67zK9en h4Lr8ZoewBQ408YaC5zl7ilFXgRBMhfCanDWWHv8jAv1rk9VQU8q9uNGo518e0Ks 2Gg/zTmQYp7dNMHsVO4AEr3UQye1yZdGdP1q1yk3nbNgZbDq4xWWZWl1p4Iy+QG3 e4SY+OYenQC/+pafUQOzPoiG3I/f8RAQG9SAtne+gtIyF85+Q8mVizuU89GdtH3O rKcaiNk/FpSbcBxAXEGb0qNy6PW6gnAbSznrOdc7MEj2V5E3KfoR7oVO =VO/+ -----END PGP SIGNATURE----- Merge tag 'regmap-sccb' of https://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap into regmap-4.19 regmap: Add support for SCCB This is an I2C subset.
This commit is contained in:
commit
e594a0636b
4 changed files with 168 additions and 0 deletions
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@ -45,3 +45,7 @@ config REGMAP_IRQ
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config REGMAP_SOUNDWIRE
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tristate
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depends on SOUNDWIRE_BUS
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config REGMAP_SCCB
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tristate
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depends on I2C
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@ -15,3 +15,4 @@ obj-$(CONFIG_REGMAP_MMIO) += regmap-mmio.o
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obj-$(CONFIG_REGMAP_IRQ) += regmap-irq.o
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obj-$(CONFIG_REGMAP_W1) += regmap-w1.o
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obj-$(CONFIG_REGMAP_SOUNDWIRE) += regmap-sdw.o
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obj-$(CONFIG_REGMAP_SCCB) += regmap-sccb.o
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128
drivers/base/regmap/regmap-sccb.c
Normal file
128
drivers/base/regmap/regmap-sccb.c
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@ -0,0 +1,128 @@
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// SPDX-License-Identifier: GPL-2.0
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// Register map access API - SCCB support
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#include <linux/regmap.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include "internal.h"
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/**
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* sccb_is_available - Check if the adapter supports SCCB protocol
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* @adap: I2C adapter
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*
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* Return true if the I2C adapter is capable of using SCCB helper functions,
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* false otherwise.
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*/
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static bool sccb_is_available(struct i2c_adapter *adap)
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{
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u32 needed_funcs = I2C_FUNC_SMBUS_BYTE | I2C_FUNC_SMBUS_WRITE_BYTE_DATA;
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/*
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* If we ever want support for hardware doing SCCB natively, we will
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* introduce a sccb_xfer() callback to struct i2c_algorithm and check
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* for it here.
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*/
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return (i2c_get_functionality(adap) & needed_funcs) == needed_funcs;
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}
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/**
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* regmap_sccb_read - Read data from SCCB slave device
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* @context: Device that will be interacted wit
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* @reg: Register to be read from
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* @val: Pointer to store read value
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*
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* This executes the 2-phase write transmission cycle that is followed by a
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* 2-phase read transmission cycle, returning negative errno else zero on
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* success.
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*/
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static int regmap_sccb_read(void *context, unsigned int reg, unsigned int *val)
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{
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struct device *dev = context;
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struct i2c_client *i2c = to_i2c_client(dev);
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int ret;
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union i2c_smbus_data data;
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i2c_lock_bus(i2c->adapter, I2C_LOCK_SEGMENT);
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ret = __i2c_smbus_xfer(i2c->adapter, i2c->addr, i2c->flags,
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I2C_SMBUS_WRITE, reg, I2C_SMBUS_BYTE, NULL);
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if (ret < 0)
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goto out;
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ret = __i2c_smbus_xfer(i2c->adapter, i2c->addr, i2c->flags,
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I2C_SMBUS_READ, 0, I2C_SMBUS_BYTE, &data);
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if (ret < 0)
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goto out;
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*val = data.byte;
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out:
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i2c_unlock_bus(i2c->adapter, I2C_LOCK_SEGMENT);
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return ret;
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}
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/**
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* regmap_sccb_write - Write data to SCCB slave device
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* @context: Device that will be interacted wit
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* @reg: Register to write to
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* @val: Value to be written
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*
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* This executes the SCCB 3-phase write transmission cycle, returning negative
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* errno else zero on success.
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*/
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static int regmap_sccb_write(void *context, unsigned int reg, unsigned int val)
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{
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struct device *dev = context;
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struct i2c_client *i2c = to_i2c_client(dev);
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return i2c_smbus_write_byte_data(i2c, reg, val);
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}
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static struct regmap_bus regmap_sccb_bus = {
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.reg_write = regmap_sccb_write,
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.reg_read = regmap_sccb_read,
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};
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static const struct regmap_bus *regmap_get_sccb_bus(struct i2c_client *i2c,
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const struct regmap_config *config)
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{
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if (config->val_bits == 8 && config->reg_bits == 8 &&
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sccb_is_available(i2c->adapter))
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return ®map_sccb_bus;
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return ERR_PTR(-ENOTSUPP);
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}
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struct regmap *__regmap_init_sccb(struct i2c_client *i2c,
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const struct regmap_config *config,
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struct lock_class_key *lock_key,
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const char *lock_name)
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{
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const struct regmap_bus *bus = regmap_get_sccb_bus(i2c, config);
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if (IS_ERR(bus))
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return ERR_CAST(bus);
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return __regmap_init(&i2c->dev, bus, &i2c->dev, config,
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lock_key, lock_name);
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}
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EXPORT_SYMBOL_GPL(__regmap_init_sccb);
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struct regmap *__devm_regmap_init_sccb(struct i2c_client *i2c,
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const struct regmap_config *config,
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struct lock_class_key *lock_key,
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const char *lock_name)
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{
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const struct regmap_bus *bus = regmap_get_sccb_bus(i2c, config);
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if (IS_ERR(bus))
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return ERR_CAST(bus);
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return __devm_regmap_init(&i2c->dev, bus, &i2c->dev, config,
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lock_key, lock_name);
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}
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EXPORT_SYMBOL_GPL(__devm_regmap_init_sccb);
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MODULE_LICENSE("GPL v2");
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@ -514,6 +514,10 @@ struct regmap *__regmap_init_i2c(struct i2c_client *i2c,
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const struct regmap_config *config,
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struct lock_class_key *lock_key,
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const char *lock_name);
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struct regmap *__regmap_init_sccb(struct i2c_client *i2c,
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const struct regmap_config *config,
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struct lock_class_key *lock_key,
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const char *lock_name);
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struct regmap *__regmap_init_slimbus(struct slim_device *slimbus,
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const struct regmap_config *config,
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struct lock_class_key *lock_key,
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@ -558,6 +562,10 @@ struct regmap *__devm_regmap_init_i2c(struct i2c_client *i2c,
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const struct regmap_config *config,
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struct lock_class_key *lock_key,
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const char *lock_name);
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struct regmap *__devm_regmap_init_sccb(struct i2c_client *i2c,
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const struct regmap_config *config,
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struct lock_class_key *lock_key,
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const char *lock_name);
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struct regmap *__devm_regmap_init_spi(struct spi_device *dev,
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const struct regmap_config *config,
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struct lock_class_key *lock_key,
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@ -645,6 +653,19 @@ int regmap_attach_dev(struct device *dev, struct regmap *map,
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__regmap_lockdep_wrapper(__regmap_init_i2c, #config, \
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i2c, config)
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/**
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* regmap_init_sccb() - Initialise register map
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*
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* @i2c: Device that will be interacted with
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* @config: Configuration for register map
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*
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* The return value will be an ERR_PTR() on error or a valid pointer to
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* a struct regmap.
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*/
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#define regmap_init_sccb(i2c, config) \
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__regmap_lockdep_wrapper(__regmap_init_sccb, #config, \
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i2c, config)
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/**
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* regmap_init_slimbus() - Initialise register map
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*
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@ -797,6 +818,20 @@ bool regmap_ac97_default_volatile(struct device *dev, unsigned int reg);
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__regmap_lockdep_wrapper(__devm_regmap_init_i2c, #config, \
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i2c, config)
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/**
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* devm_regmap_init_sccb() - Initialise managed register map
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*
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* @i2c: Device that will be interacted with
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* @config: Configuration for register map
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*
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* The return value will be an ERR_PTR() on error or a valid pointer
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* to a struct regmap. The regmap will be automatically freed by the
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* device management code.
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*/
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#define devm_regmap_init_sccb(i2c, config) \
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__regmap_lockdep_wrapper(__devm_regmap_init_sccb, #config, \
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i2c, config)
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/**
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* devm_regmap_init_spi() - Initialise register map
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*
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