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Merge tag 'at24-updates-for-v5.17' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux into i2c/for-mergewindow 

at24 updates for v5.17

- add support for a new model: Microchip 24c1025
- reorganize the compatible definitions in the DT binding document
- drop the at24_client structure by retrieving the struct device associated
  with the chip's regmap
This commit is contained in:
Wolfram Sang 2022-01-06 14:26:39 +01:00
parent 8ab1ff9b1e d08aea21c8
commit f68ae7823a
2 changed files with 47 additions and 50 deletions
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29
Documentation/devicetree/bindings/eeprom/at24.yaml
View File

@ -86,6 +86,10 @@ properties:
pattern: c1024$
- items:
pattern: cs1024$
- items:
pattern: c1025$
- items:
pattern: cs1025$
- items:
pattern: c2048$
- items:
@ -95,17 +99,20 @@ properties:
# These are special cases that don't conform to the above pattern.
# Each requires a standard at24 model as fallback.
- items:
- const: nxp,se97b
- enum:
- rohm,br24g01
- rohm,br24t01
- const: atmel,24c01
- items:
- enum:
- nxp,se97b
- renesas,r1ex24002
- const: atmel,24c02
- items:
- const: onnn,cat24c04
- enum:
- onnn,cat24c04
- onnn,cat24c05
- const: atmel,24c04
- items:
- const: onnn,cat24c05
- const: atmel,24c04
- items:
- const: renesas,r1ex24002
- const: atmel,24c02
- items:
- const: renesas,r1ex24016
- const: atmel,24c16
@ -115,12 +122,6 @@ properties:
- items:
- const: renesas,r1ex24128
- const: atmel,24c128
- items:
- const: rohm,br24g01
- const: atmel,24c01
- items:
- const: rohm,br24t01
- const: atmel,24c01
label:
description: Descriptive name of the EEPROM.

68
drivers/misc/eeprom/at24.c
View File

@ -68,11 +68,6 @@
* which won't work on pure SMBus systems.
*/
struct at24_client {
struct i2c_client *client;
struct regmap *regmap;
};
struct at24_data {
/*
* Lock protects against activities from other Linux tasks,
@ -94,9 +89,10 @@ struct at24_data {
/*
* Some chips tie up multiple I2C addresses; dummy devices reserve
* them for us, and we'll use them with SMBus calls.
* them for us.
*/
struct at24_client client[];
u8 bank_addr_shift;
struct regmap *client_regmaps[];
};
/*
@ -123,6 +119,7 @@ MODULE_PARM_DESC(at24_write_timeout, "Time (in ms) to try writes (default 25)");
struct at24_chip_data {
u32 byte_len;
u8 flags;
u8 bank_addr_shift;
void (*read_post)(unsigned int off, char *buf, size_t count);
};
@ -137,6 +134,12 @@ struct at24_chip_data {
.read_post = _read_post, \
}
#define AT24_CHIP_DATA_BS(_name, _len, _flags, _bank_addr_shift) \
static const struct at24_chip_data _name = { \
.byte_len = _len, .flags = _flags, \
.bank_addr_shift = _bank_addr_shift \
}
static void at24_read_post_vaio(unsigned int off, char *buf, size_t count)
{
int i;
@ -197,6 +200,7 @@ AT24_CHIP_DATA(at24_data_24c128, 131072 / 8, AT24_FLAG_ADDR16);
AT24_CHIP_DATA(at24_data_24c256, 262144 / 8, AT24_FLAG_ADDR16);
AT24_CHIP_DATA(at24_data_24c512, 524288 / 8, AT24_FLAG_ADDR16);
AT24_CHIP_DATA(at24_data_24c1024, 1048576 / 8, AT24_FLAG_ADDR16);
AT24_CHIP_DATA_BS(at24_data_24c1025, 1048576 / 8, AT24_FLAG_ADDR16, 2);
AT24_CHIP_DATA(at24_data_24c2048, 2097152 / 8, AT24_FLAG_ADDR16);
/* identical to 24c08 ? */
AT24_CHIP_DATA(at24_data_INT3499, 8192 / 8, 0);
@ -225,6 +229,7 @@ static const struct i2c_device_id at24_ids[] = {
{ "24c256", (kernel_ulong_t)&at24_data_24c256 },
{ "24c512", (kernel_ulong_t)&at24_data_24c512 },
{ "24c1024", (kernel_ulong_t)&at24_data_24c1024 },
{ "24c1025", (kernel_ulong_t)&at24_data_24c1025 },
{ "24c2048", (kernel_ulong_t)&at24_data_24c2048 },
{ "at24", 0 },
{ /* END OF LIST */ }
@ -254,6 +259,7 @@ static const struct of_device_id at24_of_match[] = {
{ .compatible = "atmel,24c256", .data = &at24_data_24c256 },
{ .compatible = "atmel,24c512", .data = &at24_data_24c512 },
{ .compatible = "atmel,24c1024", .data = &at24_data_24c1024 },
{ .compatible = "atmel,24c1025", .data = &at24_data_24c1025 },
{ .compatible = "atmel,24c2048", .data = &at24_data_24c2048 },
{ /* END OF LIST */ },
};
@ -275,8 +281,8 @@ MODULE_DEVICE_TABLE(acpi, at24_acpi_ids);
* set the byte address; on a multi-master board, another master
* may have changed the chip's "current" address pointer.
*/
static struct at24_client *at24_translate_offset(struct at24_data *at24,
unsigned int *offset)
static struct regmap *at24_translate_offset(struct at24_data *at24,
unsigned int *offset)
{
unsigned int i;
@ -288,12 +294,12 @@ static struct at24_client *at24_translate_offset(struct at24_data *at24,
*offset &= 0xff;
}
return &at24->client[i];
return at24->client_regmaps[i];
}
static struct device *at24_base_client_dev(struct at24_data *at24)
{
return &at24->client[0].client->dev;
return regmap_get_device(at24->client_regmaps[0]);
}
static size_t at24_adjust_read_count(struct at24_data *at24,
@ -324,14 +330,10 @@ static ssize_t at24_regmap_read(struct at24_data *at24, char *buf,
unsigned int offset, size_t count)
{
unsigned long timeout, read_time;
struct at24_client *at24_client;
struct i2c_client *client;
struct regmap *regmap;
int ret;
at24_client = at24_translate_offset(at24, &offset);
regmap = at24_client->regmap;
client = at24_client->client;
regmap = at24_translate_offset(at24, &offset);
count = at24_adjust_read_count(at24, offset, count);
/* adjust offset for mac and serial read ops */
@ -346,7 +348,7 @@ static ssize_t at24_regmap_read(struct at24_data *at24, char *buf,
read_time = jiffies;
ret = regmap_bulk_read(regmap, offset, buf, count);
dev_dbg(&client->dev, "read %zu@%d --> %d (%ld)\n",
dev_dbg(regmap_get_device(regmap), "read %zu@%d --> %d (%ld)\n",
count, offset, ret, jiffies);
if (!ret)
return count;
@ -387,14 +389,10 @@ static ssize_t at24_regmap_write(struct at24_data *at24, const char *buf,
unsigned int offset, size_t count)
{
unsigned long timeout, write_time;
struct at24_client *at24_client;
struct i2c_client *client;
struct regmap *regmap;
int ret;
at24_client = at24_translate_offset(at24, &offset);
regmap = at24_client->regmap;
client = at24_client->client;
regmap = at24_translate_offset(at24, &offset);
count = at24_adjust_write_count(at24, offset, count);
timeout = jiffies + msecs_to_jiffies(at24_write_timeout);
@ -406,7 +404,7 @@ static ssize_t at24_regmap_write(struct at24_data *at24, const char *buf,
write_time = jiffies;
ret = regmap_bulk_write(regmap, offset, buf, count);
dev_dbg(&client->dev, "write %zu@%d --> %d (%ld)\n",
dev_dbg(regmap_get_device(regmap), "write %zu@%d --> %d (%ld)\n",
count, offset, ret, jiffies);
if (!ret)
return count;
@ -538,17 +536,16 @@ static const struct at24_chip_data *at24_get_chip_data(struct device *dev)
}
static int at24_make_dummy_client(struct at24_data *at24, unsigned int index,
struct i2c_client *base_client,
struct regmap_config *regmap_config)
{
struct i2c_client *base_client, *dummy_client;
struct i2c_client *dummy_client;
struct regmap *regmap;
struct device *dev;
base_client = at24->client[0].client;
dev = &base_client->dev;
dummy_client = devm_i2c_new_dummy_device(dev, base_client->adapter,
base_client->addr + index);
dummy_client = devm_i2c_new_dummy_device(&base_client->dev,
base_client->adapter,
base_client->addr +
(index << at24->bank_addr_shift));
if (IS_ERR(dummy_client))
return PTR_ERR(dummy_client);
@ -556,8 +553,7 @@ static int at24_make_dummy_client(struct at24_data *at24, unsigned int index,
if (IS_ERR(regmap))
return PTR_ERR(regmap);
at24->client[index].client = dummy_client;
at24->client[index].regmap = regmap;
at24->client_regmaps[index] = regmap;
return 0;
}
@ -680,7 +676,7 @@ static int at24_probe(struct i2c_client *client)
if (IS_ERR(regmap))
return PTR_ERR(regmap);
at24 = devm_kzalloc(dev, struct_size(at24, client, num_addresses),
at24 = devm_kzalloc(dev, struct_size(at24, client_regmaps, num_addresses),
GFP_KERNEL);
if (!at24)
return -ENOMEM;
@ -690,10 +686,10 @@ static int at24_probe(struct i2c_client *client)
at24->page_size = page_size;
at24->flags = flags;
at24->read_post = cdata->read_post;
at24->bank_addr_shift = cdata->bank_addr_shift;
at24->num_addresses = num_addresses;
at24->offset_adj = at24_get_offset_adj(flags, byte_len);
at24->client[0].client = client;
at24->client[0].regmap = regmap;
at24->client_regmaps[0] = regmap;
at24->vcc_reg = devm_regulator_get(dev, "vcc");
if (IS_ERR(at24->vcc_reg))
@ -709,7 +705,7 @@ static int at24_probe(struct i2c_client *client)
/* use dummy devices for multiple-address chips */
for (i = 1; i < num_addresses; i++) {
err = at24_make_dummy_client(at24, i, &regmap_config);
err = at24_make_dummy_client(at24, i, client, &regmap_config);
if (err)
return err;
}