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regmap: Changes for v4.19 

Several small new features for regmap this time around:
 
  - Support for SCCB, an I2C variant used on some media cards.  This has
    also pulled in an I2C commit from Peter Rosin as a dependency.
  - Addition of an API for reading repeatedly from registers where the
    address doesn't automatically increment like some ADC outputs or GPIO
    status registers.
  - Support for bulk I/O on Slimbus.
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Merge tag 'regmap-v4.19' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap

Pull regmap updates from Mark Brown:
 "Several small new features for regmap this time around:

   - Support for SCCB, an I2C variant used on some media cards. This has
     also pulled in an I2C commit from Peter Rosin as a dependency.

   - Addition of an API for reading repeatedly from registers where the
     address doesn't automatically increment like some ADC outputs or
     GPIO status registers.

   - Support for bulk I/O on Slimbus"

* tag 'regmap-v4.19' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap:
  regmap: Add regmap_noinc_read API
  regmap: sccb: fix typo and sort headers alphabetically
  i2c: smbus: add unlocked __i2c_smbus_xfer variant
  regmap: add SCCB support
  regmap: slimbus: add support to multi read/write
This commit is contained in:
Linus Torvalds 2018-08-14 11:51:03 -07:00
parent be718b524d 1dce5d849f
commit 15bc88cd5f
9 changed files with 303 additions and 28 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/base/regmap/Kconfig
View File

@ -45,3 +45,7 @@ config REGMAP_IRQ
config REGMAP_SOUNDWIRE
tristate
depends on SOUNDWIRE_BUS
config REGMAP_SCCB
tristate
depends on I2C

1
drivers/base/regmap/Makefile
View File

@ -15,3 +15,4 @@ 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
obj-$(CONFIG_REGMAP_SCCB) += regmap-sccb.o

3
drivers/base/regmap/internal.h
View File

@ -94,10 +94,12 @@ struct regmap {
bool (*readable_reg)(struct device *dev, unsigned int reg);
bool (*volatile_reg)(struct device *dev, unsigned int reg);
bool (*precious_reg)(struct device *dev, unsigned int reg);
bool (*readable_noinc_reg)(struct device *dev, unsigned int reg);
const struct regmap_access_table *wr_table;
const struct regmap_access_table *rd_table;
const struct regmap_access_table *volatile_table;
const struct regmap_access_table *precious_table;
const struct regmap_access_table *rd_noinc_table;
int (*reg_read)(void *context, unsigned int reg, unsigned int *val);
int (*reg_write)(void *context, unsigned int reg, unsigned int val);
@ -181,6 +183,7 @@ bool regmap_writeable(struct regmap *map, unsigned int reg);
bool regmap_readable(struct regmap *map, unsigned int reg);
bool regmap_volatile(struct regmap *map, unsigned int reg);
bool regmap_precious(struct regmap *map, unsigned int reg);
bool regmap_readable_noinc(struct regmap *map, unsigned int reg);
int _regmap_write(struct regmap *map, unsigned int reg,
unsigned int val);

128
drivers/base/regmap/regmap-sccb.c Normal file
View File

@ -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");

23
drivers/base/regmap/regmap-slimbus.c
View File

@ -7,33 +7,24 @@
#include "internal.h"
static int regmap_slimbus_byte_reg_read(void *context, unsigned int reg,
unsigned int *val)
static int regmap_slimbus_write(void *context, const void *data, size_t count)
{
struct slim_device *sdev = context;
int v;
v = slim_readb(sdev, reg);
if (v < 0)
return v;
*val = v;
return 0;
return slim_write(sdev, *(u16 *)data, count - 2, (u8 *)data + 2);
}
static int regmap_slimbus_byte_reg_write(void *context, unsigned int reg,
unsigned int val)
static int regmap_slimbus_read(void *context, const void *reg, size_t reg_size,
void *val, size_t val_size)
{
struct slim_device *sdev = context;
return slim_writeb(sdev, reg, val);
return slim_read(sdev, *(u16 *)reg, val_size, val);
}
static struct regmap_bus regmap_slimbus_bus = {
.reg_write = regmap_slimbus_byte_reg_write,
.reg_read = regmap_slimbus_byte_reg_read,
.write = regmap_slimbus_write,
.read = regmap_slimbus_read,
.reg_format_endian_default = REGMAP_ENDIAN_LITTLE,
.val_format_endian_default = REGMAP_ENDIAN_LITTLE,
};

79
drivers/base/regmap/regmap.c
View File

@ -168,6 +168,17 @@ bool regmap_precious(struct regmap *map, unsigned int reg)
return false;
}
bool regmap_readable_noinc(struct regmap *map, unsigned int reg)
{
if (map->readable_noinc_reg)
return map->readable_noinc_reg(map->dev, reg);
if (map->rd_noinc_table)
return regmap_check_range_table(map, reg, map->rd_noinc_table);
return true;
}
static bool regmap_volatile_range(struct regmap *map, unsigned int reg,
size_t num)
{
@ -766,10 +777,12 @@ struct regmap *__regmap_init(struct device *dev,
map->rd_table = config->rd_table;
map->volatile_table = config->volatile_table;
map->precious_table = config->precious_table;
map->rd_noinc_table = config->rd_noinc_table;
map->writeable_reg = config->writeable_reg;
map->readable_reg = config->readable_reg;
map->volatile_reg = config->volatile_reg;
map->precious_reg = config->precious_reg;
map->readable_noinc_reg = config->readable_noinc_reg;
map->cache_type = config->cache_type;
spin_lock_init(&map->async_lock);
@ -1285,6 +1298,7 @@ int regmap_reinit_cache(struct regmap *map, const struct regmap_config *config)
map->readable_reg = config->readable_reg;
map->volatile_reg = config->volatile_reg;
map->precious_reg = config->precious_reg;
map->readable_noinc_reg = config->readable_noinc_reg;
map->cache_type = config->cache_type;
regmap_debugfs_init(map, config->name);
@ -2564,7 +2578,70 @@ int regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
EXPORT_SYMBOL_GPL(regmap_raw_read);
/**
* regmap_field_read() - Read a value to a single register field
* regmap_noinc_read(): Read data from a register without incrementing the
* register number
*
* @map: Register map to read from
* @reg: Register to read from
* @val: Pointer to data buffer
* @val_len: Length of output buffer in bytes.
*
* The regmap API usually assumes that bulk bus read operations will read a
* range of registers. Some devices have certain registers for which a read
* operation read will read from an internal FIFO.
*
* The target register must be volatile but registers after it can be
* completely unrelated cacheable registers.
*
* This will attempt multiple reads as required to read val_len bytes.
*
* A value of zero will be returned on success, a negative errno will be
* returned in error cases.
*/
int regmap_noinc_read(struct regmap *map, unsigned int reg,
void *val, size_t val_len)
{
size_t read_len;
int ret;
if (!map->bus)
return -EINVAL;
if (!map->bus->read)
return -ENOTSUPP;
if (val_len % map->format.val_bytes)
return -EINVAL;
if (!IS_ALIGNED(reg, map->reg_stride))
return -EINVAL;
if (val_len == 0)
return -EINVAL;
map->lock(map->lock_arg);
if (!regmap_volatile(map, reg) || !regmap_readable_noinc(map, reg)) {
ret = -EINVAL;
goto out_unlock;
}
while (val_len) {
if (map->max_raw_read && map->max_raw_read < val_len)
read_len = map->max_raw_read;
else
read_len = val_len;
ret = _regmap_raw_read(map, reg, val, read_len);
if (ret)
goto out_unlock;
val = ((u8 *)val) + read_len;
val_len -= read_len;
}
out_unlock:
map->unlock(map->lock_arg);
return ret;
}
EXPORT_SYMBOL_GPL(regmap_noinc_read);
/**
* regmap_field_read(): Read a value to a single register field
*
* @field: Register field to read from
* @val: Pointer to store read value

28
drivers/i2c/i2c-core-smbus.c
View File

@ -463,7 +463,7 @@ static s32 i2c_smbus_xfer_emulated(struct i2c_adapter *adapter, u16 addr,
msg[num-1].len++;
}
status = i2c_transfer(adapter, msg, num);
status = __i2c_transfer(adapter, msg, num);
if (status < 0)
goto cleanup;
if (status != num) {
@ -524,9 +524,24 @@ cleanup:
* This executes an SMBus protocol operation, and returns a negative
* errno code else zero on success.
*/
s32 i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr, unsigned short flags,
char read_write, u8 command, int protocol,
union i2c_smbus_data *data)
s32 i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr,
unsigned short flags, char read_write,
u8 command, int protocol, union i2c_smbus_data *data)
{
s32 res;
i2c_lock_bus(adapter, I2C_LOCK_SEGMENT);
res = __i2c_smbus_xfer(adapter, addr, flags, read_write,
command, protocol, data);
i2c_unlock_bus(adapter, I2C_LOCK_SEGMENT);
return res;
}
EXPORT_SYMBOL(i2c_smbus_xfer);
s32 __i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr,
unsigned short flags, char read_write,
u8 command, int protocol, union i2c_smbus_data *data)
{
unsigned long orig_jiffies;
int try;
@ -543,8 +558,6 @@ s32 i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr, unsigned short flags,
flags &= I2C_M_TEN | I2C_CLIENT_PEC | I2C_CLIENT_SCCB;
if (adapter->algo->smbus_xfer) {
i2c_lock_bus(adapter, I2C_LOCK_SEGMENT);
/* Retry automatically on arbitration loss */
orig_jiffies = jiffies;
for (res = 0, try = 0; try <= adapter->retries; try++) {
@ -557,7 +570,6 @@ s32 i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr, unsigned short flags,
orig_jiffies + adapter->timeout))
break;
}
i2c_unlock_bus(adapter, I2C_LOCK_SEGMENT);
if (res != -EOPNOTSUPP || !adapter->algo->master_xfer)
goto trace;
@ -579,7 +591,7 @@ trace:
return res;
}
EXPORT_SYMBOL(i2c_smbus_xfer);
EXPORT_SYMBOL(__i2c_smbus_xfer);
/**
* i2c_smbus_read_i2c_block_data_or_emulated - read block or emulate

11
include/linux/i2c.h
View File

@ -140,9 +140,14 @@ extern int __i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
and probably just as fast.
Note that we use i2c_adapter here, because you do not need a specific
smbus adapter to call this function. */
extern s32 i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr,
unsigned short flags, char read_write, u8 command,
int size, union i2c_smbus_data *data);
s32 i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr,
unsigned short flags, char read_write, u8 command,
int protocol, union i2c_smbus_data *data);
/* Unlocked flavor */
s32 __i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr,
unsigned short flags, char read_write, u8 command,
int protocol, union i2c_smbus_data *data);
/* Now follow the 'nice' access routines. These also document the calling
conventions of i2c_smbus_xfer. */

54
include/linux/regmap.h
View File

@ -268,6 +268,13 @@ typedef void (*regmap_unlock)(void *);
* field is NULL but precious_table (see below) is not, the
* check is performed on such table (a register is precious if
* it belongs to one of the ranges specified by precious_table).
* @readable_noinc_reg: Optional callback returning true if the register
* supports multiple read operations without incrementing
* the register number. If this field is NULL but
* rd_noinc_table (see below) is not, the check is
* performed on such table (a register is no increment
* readable if it belongs to one of the ranges specified
* by rd_noinc_table).
* @disable_locking: This regmap is either protected by external means or
* is guaranteed not be be accessed from multiple threads.
* Don't use any locking mechanisms.
@ -295,6 +302,7 @@ typedef void (*regmap_unlock)(void *);
* @rd_table: As above, for read access.
* @volatile_table: As above, for volatile registers.
* @precious_table: As above, for precious registers.
* @rd_noinc_table: As above, for no increment readable registers.
* @reg_defaults: Power on reset values for registers (for use with
* register cache support).
* @num_reg_defaults: Number of elements in reg_defaults.
@ -344,6 +352,7 @@ struct regmap_config {
bool (*readable_reg)(struct device *dev, unsigned int reg);
bool (*volatile_reg)(struct device *dev, unsigned int reg);
bool (*precious_reg)(struct device *dev, unsigned int reg);
bool (*readable_noinc_reg)(struct device *dev, unsigned int reg);
bool disable_locking;
regmap_lock lock;
@ -360,6 +369,7 @@ struct regmap_config {
const struct regmap_access_table *rd_table;
const struct regmap_access_table *volatile_table;
const struct regmap_access_table *precious_table;
const struct regmap_access_table *rd_noinc_table;
const struct reg_default *reg_defaults;
unsigned int num_reg_defaults;
enum regcache_type cache_type;
@ -514,6 +524,10 @@ struct regmap *__regmap_init_i2c(struct i2c_client *i2c,
const struct regmap_config *config,
struct lock_class_key *lock_key,
const char *lock_name);
struct regmap *__regmap_init_sccb(struct i2c_client *i2c,
const struct regmap_config *config,
struct lock_class_key *lock_key,
const char *lock_name);
struct regmap *__regmap_init_slimbus(struct slim_device *slimbus,
const struct regmap_config *config,
struct lock_class_key *lock_key,
@ -558,6 +572,10 @@ struct regmap *__devm_regmap_init_i2c(struct i2c_client *i2c,
const struct regmap_config *config,
struct lock_class_key *lock_key,
const char *lock_name);
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);
struct regmap *__devm_regmap_init_spi(struct spi_device *dev,
const struct regmap_config *config,
struct lock_class_key *lock_key,
@ -645,6 +663,19 @@ int regmap_attach_dev(struct device *dev, struct regmap *map,
__regmap_lockdep_wrapper(__regmap_init_i2c, #config, \
i2c, config)
/**
* regmap_init_sccb() - Initialise register map
*
* @i2c: Device that will be interacted with
* @config: Configuration for register map
*
* The return value will be an ERR_PTR() on error or a valid pointer to
* a struct regmap.
*/
#define regmap_init_sccb(i2c, config) \
__regmap_lockdep_wrapper(__regmap_init_sccb, #config, \
i2c, config)
/**
* regmap_init_slimbus() - Initialise register map
*
@ -797,6 +828,20 @@ bool regmap_ac97_default_volatile(struct device *dev, unsigned int reg);
__regmap_lockdep_wrapper(__devm_regmap_init_i2c, #config, \
i2c, config)
/**
* devm_regmap_init_sccb() - Initialise managed register map
*
* @i2c: Device that will be interacted with
* @config: Configuration for register map
*
* The return value will be an ERR_PTR() on error or a valid pointer
* to a struct regmap. The regmap will be automatically freed by the
* device management code.
*/
#define devm_regmap_init_sccb(i2c, config) \
__regmap_lockdep_wrapper(__devm_regmap_init_sccb, #config, \
i2c, config)
/**
* devm_regmap_init_spi() - Initialise register map
*
@ -946,6 +991,8 @@ int regmap_raw_write_async(struct regmap *map, unsigned int reg,
int regmap_read(struct regmap *map, unsigned int reg, unsigned int *val);
int regmap_raw_read(struct regmap *map, unsigned int reg,
void *val, size_t val_len);
int regmap_noinc_read(struct regmap *map, unsigned int reg,
void *val, size_t val_len);
int regmap_bulk_read(struct regmap *map, unsigned int reg, void *val,
size_t val_count);
int regmap_update_bits_base(struct regmap *map, unsigned int reg,
@ -1196,6 +1243,13 @@ static inline int regmap_raw_read(struct regmap *map, unsigned int reg,
return -EINVAL;
}
static inline int regmap_noinc_read(struct regmap *map, unsigned int reg,
void *val, size_t val_len)
{
WARN_ONCE(1, "regmap API is disabled");
return -EINVAL;
}
static inline int regmap_bulk_read(struct regmap *map, unsigned int reg,
void *val, size_t val_count)
{