From 92e1764787e57417b8890db0f154c0f405548cdd Mon Sep 17 00:00:00 2001 From: Heiner Kallweit Date: Sun, 28 Nov 2021 19:14:50 +0100 Subject: eeprom: at24: remove struct at24_client We use member client only to get a reference to the associated struct device, via &client->dev. However we can get the same reference from the associated regmap, via regmap_get_device(regmap). Therefore struct at24_client can be removed and replaced with a regmap pointer. Signed-off-by: Heiner Kallweit Signed-off-by: Bartosz Golaszewski --- drivers/misc/eeprom/at24.c | 53 ++++++++++++++++------------------------------ 1 file changed, 18 insertions(+), 35 deletions(-) (limited to 'drivers/misc') diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c index 49ab656e8a96..4d91c71c42cd 100644 --- a/drivers/misc/eeprom/at24.c +++ b/drivers/misc/eeprom/at24.c @@ -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 +89,9 @@ 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[]; + struct regmap *client_regmaps[]; }; /* @@ -275,8 +270,8 @@ 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 +283,12 @@ 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 +319,10 @@ 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 +337,7 @@ 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 +378,10 @@ 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 +393,7 @@ 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; @@ -538,16 +525,14 @@ 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, + dummy_client = devm_i2c_new_dummy_device(&base_client->dev, + base_client->adapter, base_client->addr + index); if (IS_ERR(dummy_client)) return PTR_ERR(dummy_client); @@ -556,8 +541,7 @@ 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 +664,7 @@ 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; @@ -692,8 +676,7 @@ static int at24_probe(struct i2c_client *client) at24->read_post = cdata->read_post; 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 +692,7 @@ 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, ®map_config); + err = at24_make_dummy_client(at24, i, client, ®map_config); if (err) return err; } -- cgit From d08aea21c89dc2d302cadb5c2cc5410b6c3395c8 Mon Sep 17 00:00:00 2001 From: Maxim Kochetkov Date: Fri, 10 Dec 2021 21:26:03 +0300 Subject: 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: Maxim Kochetkov Signed-off-by: Bartosz Golaszewski --- drivers/misc/eeprom/at24.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) (limited to 'drivers/misc') diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c index 4d91c71c42cd..633e1cf08d6e 100644 --- a/drivers/misc/eeprom/at24.c +++ b/drivers/misc/eeprom/at24.c @@ -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; -- cgit