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Subject[PATCH AUTOSEL 5.13 23/85] regmap-i2c: Set regmap max raw r/w from quirks
Date
From: Lucas Tanure <tanureal@opensource.cirrus.com>

[ Upstream commit ea030ca688193462b8d612c1628c37129aa30072 ]

Set regmap raw read/write from i2c quirks max read/write
so regmap_raw_read/write can split the access into chunks

Signed-off-by: Lucas Tanure <tanureal@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20210512135222.223203-1-tanureal@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/base/regmap/regmap-i2c.c | 45 +++++++++++++++++++++++++++-----
drivers/base/regmap/regmap.c | 2 ++
include/linux/regmap.h | 2 ++
3 files changed, 42 insertions(+), 7 deletions(-)

diff --git a/drivers/base/regmap/regmap-i2c.c b/drivers/base/regmap/regmap-i2c.c
index 62b95a9212ae..980e5ce6a3a3 100644
--- a/drivers/base/regmap/regmap-i2c.c
+++ b/drivers/base/regmap/regmap-i2c.c
@@ -306,33 +306,64 @@ static const struct regmap_bus regmap_i2c_smbus_i2c_block_reg16 = {
static const struct regmap_bus *regmap_get_i2c_bus(struct i2c_client *i2c,
const struct regmap_config *config)
{
+ const struct i2c_adapter_quirks *quirks;
+ const struct regmap_bus *bus = NULL;
+ struct regmap_bus *ret_bus;
+ u16 max_read = 0, max_write = 0;
+
if (i2c_check_functionality(i2c->adapter, I2C_FUNC_I2C))
- return &regmap_i2c;
+ bus = &regmap_i2c;
else if (config->val_bits == 8 && config->reg_bits == 8 &&
i2c_check_functionality(i2c->adapter,
I2C_FUNC_SMBUS_I2C_BLOCK))
- return &regmap_i2c_smbus_i2c_block;
+ bus = &regmap_i2c_smbus_i2c_block;
else if (config->val_bits == 8 && config->reg_bits == 16 &&
i2c_check_functionality(i2c->adapter,
I2C_FUNC_SMBUS_I2C_BLOCK))
- return &regmap_i2c_smbus_i2c_block_reg16;
+ bus = &regmap_i2c_smbus_i2c_block_reg16;
else if (config->val_bits == 16 && config->reg_bits == 8 &&
i2c_check_functionality(i2c->adapter,
I2C_FUNC_SMBUS_WORD_DATA))
switch (regmap_get_val_endian(&i2c->dev, NULL, config)) {
case REGMAP_ENDIAN_LITTLE:
- return &regmap_smbus_word;
+ bus = &regmap_smbus_word;
+ break;
case REGMAP_ENDIAN_BIG:
- return &regmap_smbus_word_swapped;
+ bus = &regmap_smbus_word_swapped;
+ break;
default: /* everything else is not supported */
break;
}
else if (config->val_bits == 8 && config->reg_bits == 8 &&
i2c_check_functionality(i2c->adapter,
I2C_FUNC_SMBUS_BYTE_DATA))
- return &regmap_smbus_byte;
+ bus = &regmap_smbus_byte;
+
+ if (!bus)
+ return ERR_PTR(-ENOTSUPP);
+
+ quirks = i2c->adapter->quirks;
+ if (quirks) {
+ if (quirks->max_read_len &&
+ (bus->max_raw_read == 0 || bus->max_raw_read > quirks->max_read_len))
+ max_read = quirks->max_read_len;
+
+ if (quirks->max_write_len &&
+ (bus->max_raw_write == 0 || bus->max_raw_write > quirks->max_write_len))
+ max_write = quirks->max_write_len;
+
+ if (max_read || max_write) {
+ ret_bus = kmemdup(bus, sizeof(*bus), GFP_KERNEL);
+ if (!ret_bus)
+ return ERR_PTR(-ENOMEM);
+ ret_bus->free_on_exit = true;
+ ret_bus->max_raw_read = max_read;
+ ret_bus->max_raw_write = max_write;
+ bus = ret_bus;
+ }
+ }

- return ERR_PTR(-ENOTSUPP);
+ return bus;
}

struct regmap *__regmap_init_i2c(struct i2c_client *i2c,
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 297e95be25b3..0d185ec018a5 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -1496,6 +1496,8 @@ void regmap_exit(struct regmap *map)
mutex_destroy(&map->mutex);
kfree_const(map->name);
kfree(map->patch);
+ if (map->bus && map->bus->free_on_exit)
+ kfree(map->bus);
kfree(map);
}
EXPORT_SYMBOL_GPL(regmap_exit);
diff --git a/include/linux/regmap.h b/include/linux/regmap.h
index f87a11a5cc4a..8c16e6fa0f66 100644
--- a/include/linux/regmap.h
+++ b/include/linux/regmap.h
@@ -502,6 +502,7 @@ typedef void (*regmap_hw_free_context)(void *context);
* DEFAULT, BIG is assumed.
* @max_raw_read: Max raw read size that can be used on the bus.
* @max_raw_write: Max raw write size that can be used on the bus.
+ * @free_on_exit: kfree this on exit of regmap
*/
struct regmap_bus {
bool fast_io;
@@ -519,6 +520,7 @@ struct regmap_bus {
enum regmap_endian val_format_endian_default;
size_t max_raw_read;
size_t max_raw_write;
+ bool free_on_exit;
};

/*
--
2.30.2
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