Commit d08aea21 authored by Maxim Kochetkov's avatar Maxim Kochetkov Committed by Bartosz Golaszewski
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eeprom: at24: Add support for 24c1025 EEPROM 



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: default avatarMaxim Kochetkov <fido_max@inbox.ru>
Signed-off-by: default avatarBartosz Golaszewski <brgl@bgdev.pl>
parent 151a1523

drivers/misc/eeprom/at24.c

+14 −1
Original line number Diff line number Diff line
@@ -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;