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eeprom: at24: Add support for 24c1025 EEPROM

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Microchip EEPROM 24xx1025 is like a 24c1024. The only difference
between them is that the I2C address bit used to select between the
two banks is bit 2 for the 1025 and not bit 0 as in the 1024.

Signed-off-by: Maxim Kochetkov <fido_max@inbox.ru>
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
This commit is contained in:
Maxim Kochetkov 2021-12-10 21:26:03 +03:00 committed by Bartosz Golaszewski
parent 151a152316
commit d08aea21c8
1 changed files with 14 additions and 1 deletions
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15
drivers/misc/eeprom/at24.c
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@ -91,6 +91,7 @@ struct at24_data {
* Some chips tie up multiple I2C addresses; dummy devices reserve
* them for us.
*/
u8 bank_addr_shift;
struct regmap *client_regmaps[];
};
@ -118,6 +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);
};
@ -132,6 +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;
@ -192,6 +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);
@ -220,6 +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 */ }
@ -249,6 +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 */ },
};
@ -533,7 +544,8 @@ static int at24_make_dummy_client(struct at24_data *at24, unsigned int index,
dummy_client = devm_i2c_new_dummy_device(&base_client->dev,
base_client->adapter,
base_client->addr + index);
base_client->addr +
(index << at24->bank_addr_shift));
if (IS_ERR(dummy_client))
return PTR_ERR(dummy_client);
@ -674,6 +686,7 @@ 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_regmaps[0] = regmap;