Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753455AbdLHVZi (ORCPT ); Fri, 8 Dec 2017 16:25:38 -0500 Received: from mail.arcx.com ([184.94.50.18]:14046 "EHLO WEBMAIL.arcx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753225AbdLHVZP (ORCPT ); Fri, 8 Dec 2017 16:25:15 -0500 From: Sven Van Asbroeck To: , , , , , , CC: , , Subject: [PATCH v2 1/2] eeprom: at24: convert magic numbers to structs. Date: Fri, 8 Dec 2017 16:25:05 -0500 Message-ID: <1512768306-14816-2-git-send-email-svendev@arcx.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1512768306-14816-1-git-send-email-svendev@arcx.com> References: <1512768306-14816-1-git-send-email-svendev@arcx.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [192.168.2.155] X-ClientProxiedBy: webmail.arcx.com (192.168.2.64) To WEBMAIL.arcx.com (192.168.2.64) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 10229 Lines: 307 Fundamental properties such as capacity and page size differ among at24-type chips. But these chips do not have an id register, so this can't be discovered at runtime. Traditionally, at24-type eeprom properties were determined in two ways: - by passing a 'struct at24_platform_data' via platform_data, or - by naming the chip type in the devicetree, which passes a 'magic number' to probe(), which is then converted to a 'struct at24_platform_data'. Recently a bug was discovered because the magic number rounds down all chip sizes to the lowest power of two. This was addressed by a work-around, with the wish that magic numbers should over time be converted to structs. This patch replaces the magic numbers with 'struct at24_chip_data'. Signed-off-by: Sven Van Asbroeck --- drivers/misc/eeprom/at24.c | 230 ++++++++++++++++++++++----------------------- 1 file changed, 110 insertions(+), 120 deletions(-) diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c index 06ffa11..c3759cb 100644 --- a/drivers/misc/eeprom/at24.c +++ b/drivers/misc/eeprom/at24.c @@ -105,16 +105,6 @@ struct at24_data { module_param(write_timeout, uint, 0); MODULE_PARM_DESC(write_timeout, "Time (in ms) to try writes (default 25)"); -#define AT24_SIZE_BYTELEN 5 -#define AT24_SIZE_FLAGS 8 - -#define AT24_BITMASK(x) (BIT(x) - 1) - -/* create non-zero magic value for given eeprom parameters */ -#define AT24_DEVICE_MAGIC(_len, _flags) \ - ((1 << AT24_SIZE_FLAGS | (_flags)) \ - << AT24_SIZE_BYTELEN | ilog2(_len)) - /* * Both reads and writes fail if the previous write didn't complete yet. This * macro loops a few times waiting at least long enough for one entire page @@ -131,113 +121,119 @@ struct at24_data { op_time ? time_before(op_time, tout) : true; \ usleep_range(1000, 1500), op_time = jiffies) +struct at24_chip_data { + /* + * these fields mirror their equivalents in + * struct at24_platform_data + */ + u32 byte_len; + u8 flags; +}; + +#define AT24_CHIP_DATA(_name, _len, _flags) \ + static const struct at24_chip_data at24_data_##_name = { \ + .byte_len = _len, .flags = _flags, \ + } + +#define AT24_I2C_DEVICE_ID(_name) \ + { #_name, (kernel_ulong_t)&at24_data_##_name } + +#define AT24_ACPI_DEVICE_ID(_name) \ + { #_name, (kernel_ulong_t)&at24_data_##_name } + +#define AT24_OF_DEVICE_ID(_of_compat, _name) \ + { .compatible = _of_compat, .data = &at24_data_##_name } + +/* needs 8 addresses as A0-A2 are ignored */ +AT24_CHIP_DATA(24c00, 128 / 8, AT24_FLAG_TAKE8ADDR); +/* old variants can't be handled with this generic entry! */ +AT24_CHIP_DATA(24c01, 1024 / 8, 0); +AT24_CHIP_DATA(24cs01, 16, AT24_FLAG_SERIAL | AT24_FLAG_READONLY); +AT24_CHIP_DATA(24c02, 2048 / 8, 0); +AT24_CHIP_DATA(24cs02, 16, AT24_FLAG_SERIAL | AT24_FLAG_READONLY); +AT24_CHIP_DATA(24mac402, 48 / 8, + AT24_FLAG_MAC | AT24_FLAG_READONLY); +AT24_CHIP_DATA(24mac602, 64 / 8, + AT24_FLAG_MAC | AT24_FLAG_READONLY); +/* spd is a 24c02 in memory DIMMs */ +AT24_CHIP_DATA(spd, 2048 / 8, + AT24_FLAG_READONLY | AT24_FLAG_IRUGO); +AT24_CHIP_DATA(24c04, 4096 / 8, 0); +AT24_CHIP_DATA(24cs04, 16, + AT24_FLAG_SERIAL | AT24_FLAG_READONLY); +/* 24rf08 quirk is handled at i2c-core */ +AT24_CHIP_DATA(24c08, 8192 / 8, 0); +AT24_CHIP_DATA(24cs08, 16, + AT24_FLAG_SERIAL | AT24_FLAG_READONLY); +AT24_CHIP_DATA(24c16, 16384 / 8, 0); +AT24_CHIP_DATA(24cs16, 16, + AT24_FLAG_SERIAL | AT24_FLAG_READONLY); +AT24_CHIP_DATA(24c32, 32768 / 8, AT24_FLAG_ADDR16); +AT24_CHIP_DATA(24cs32, 16, + AT24_FLAG_ADDR16 | + AT24_FLAG_SERIAL | + AT24_FLAG_READONLY); +AT24_CHIP_DATA(24c64, 65536 / 8, AT24_FLAG_ADDR16); +AT24_CHIP_DATA(24cs64, 16, + AT24_FLAG_ADDR16 | + AT24_FLAG_SERIAL | + AT24_FLAG_READONLY); +AT24_CHIP_DATA(24c128, 131072 / 8, AT24_FLAG_ADDR16); +AT24_CHIP_DATA(24c256, 262144 / 8, AT24_FLAG_ADDR16); +AT24_CHIP_DATA(24c512, 524288 / 8, AT24_FLAG_ADDR16); +AT24_CHIP_DATA(24c1024, 1048576 / 8, AT24_FLAG_ADDR16); +/* identical to 24c08 ? */ +AT24_CHIP_DATA(INT3499, 8192 / 8, 0); + static const struct i2c_device_id at24_ids[] = { - /* needs 8 addresses as A0-A2 are ignored */ - { "24c00", AT24_DEVICE_MAGIC(128 / 8, AT24_FLAG_TAKE8ADDR) }, - /* old variants can't be handled with this generic entry! */ - { "24c01", AT24_DEVICE_MAGIC(1024 / 8, 0) }, - { "24cs01", AT24_DEVICE_MAGIC(16, - AT24_FLAG_SERIAL | AT24_FLAG_READONLY) }, - { "24c02", AT24_DEVICE_MAGIC(2048 / 8, 0) }, - { "24cs02", AT24_DEVICE_MAGIC(16, - AT24_FLAG_SERIAL | AT24_FLAG_READONLY) }, - { "24mac402", AT24_DEVICE_MAGIC(48 / 8, - AT24_FLAG_MAC | AT24_FLAG_READONLY) }, - { "24mac602", AT24_DEVICE_MAGIC(64 / 8, - AT24_FLAG_MAC | AT24_FLAG_READONLY) }, - /* spd is a 24c02 in memory DIMMs */ - { "spd", AT24_DEVICE_MAGIC(2048 / 8, - AT24_FLAG_READONLY | AT24_FLAG_IRUGO) }, - { "24c04", AT24_DEVICE_MAGIC(4096 / 8, 0) }, - { "24cs04", AT24_DEVICE_MAGIC(16, - AT24_FLAG_SERIAL | AT24_FLAG_READONLY) }, - /* 24rf08 quirk is handled at i2c-core */ - { "24c08", AT24_DEVICE_MAGIC(8192 / 8, 0) }, - { "24cs08", AT24_DEVICE_MAGIC(16, - AT24_FLAG_SERIAL | AT24_FLAG_READONLY) }, - { "24c16", AT24_DEVICE_MAGIC(16384 / 8, 0) }, - { "24cs16", AT24_DEVICE_MAGIC(16, - AT24_FLAG_SERIAL | AT24_FLAG_READONLY) }, - { "24c32", AT24_DEVICE_MAGIC(32768 / 8, AT24_FLAG_ADDR16) }, - { "24cs32", AT24_DEVICE_MAGIC(16, - AT24_FLAG_ADDR16 | - AT24_FLAG_SERIAL | - AT24_FLAG_READONLY) }, - { "24c64", AT24_DEVICE_MAGIC(65536 / 8, AT24_FLAG_ADDR16) }, - { "24cs64", AT24_DEVICE_MAGIC(16, - AT24_FLAG_ADDR16 | - AT24_FLAG_SERIAL | - AT24_FLAG_READONLY) }, - { "24c128", AT24_DEVICE_MAGIC(131072 / 8, AT24_FLAG_ADDR16) }, - { "24c256", AT24_DEVICE_MAGIC(262144 / 8, AT24_FLAG_ADDR16) }, - { "24c512", AT24_DEVICE_MAGIC(524288 / 8, AT24_FLAG_ADDR16) }, - { "24c1024", AT24_DEVICE_MAGIC(1048576 / 8, AT24_FLAG_ADDR16) }, + AT24_I2C_DEVICE_ID(24c00), + AT24_I2C_DEVICE_ID(24c01), + AT24_I2C_DEVICE_ID(24cs01), + AT24_I2C_DEVICE_ID(24c02), + AT24_I2C_DEVICE_ID(24cs02), + AT24_I2C_DEVICE_ID(24mac402), + AT24_I2C_DEVICE_ID(24mac602), + AT24_I2C_DEVICE_ID(spd), + AT24_I2C_DEVICE_ID(24c04), + AT24_I2C_DEVICE_ID(24cs04), + AT24_I2C_DEVICE_ID(24c08), + AT24_I2C_DEVICE_ID(24cs08), + AT24_I2C_DEVICE_ID(24c16), + AT24_I2C_DEVICE_ID(24cs16), + AT24_I2C_DEVICE_ID(24c32), + AT24_I2C_DEVICE_ID(24cs32), + AT24_I2C_DEVICE_ID(24c64), + AT24_I2C_DEVICE_ID(24cs64), + AT24_I2C_DEVICE_ID(24c128), + AT24_I2C_DEVICE_ID(24c256), + AT24_I2C_DEVICE_ID(24c512), + AT24_I2C_DEVICE_ID(24c1024), { "at24", 0 }, { /* END OF LIST */ } }; MODULE_DEVICE_TABLE(i2c, at24_ids); static const struct of_device_id at24_of_match[] = { - { - .compatible = "atmel,24c00", - .data = (void *)AT24_DEVICE_MAGIC(128 / 8, AT24_FLAG_TAKE8ADDR) - }, - { - .compatible = "atmel,24c01", - .data = (void *)AT24_DEVICE_MAGIC(1024 / 8, 0) - }, - { - .compatible = "atmel,24c02", - .data = (void *)AT24_DEVICE_MAGIC(2048 / 8, 0) - }, - { - .compatible = "atmel,spd", - .data = (void *)AT24_DEVICE_MAGIC(2048 / 8, - AT24_FLAG_READONLY | AT24_FLAG_IRUGO) - }, - { - .compatible = "atmel,24c04", - .data = (void *)AT24_DEVICE_MAGIC(4096 / 8, 0) - }, - { - .compatible = "atmel,24c08", - .data = (void *)AT24_DEVICE_MAGIC(8192 / 8, 0) - }, - { - .compatible = "atmel,24c16", - .data = (void *)AT24_DEVICE_MAGIC(16384 / 8, 0) - }, - { - .compatible = "atmel,24c32", - .data = (void *)AT24_DEVICE_MAGIC(32768 / 8, AT24_FLAG_ADDR16) - }, - { - .compatible = "atmel,24c64", - .data = (void *)AT24_DEVICE_MAGIC(65536 / 8, AT24_FLAG_ADDR16) - }, - { - .compatible = "atmel,24c128", - .data = (void *)AT24_DEVICE_MAGIC(131072 / 8, AT24_FLAG_ADDR16) - }, - { - .compatible = "atmel,24c256", - .data = (void *)AT24_DEVICE_MAGIC(262144 / 8, AT24_FLAG_ADDR16) - }, - { - .compatible = "atmel,24c512", - .data = (void *)AT24_DEVICE_MAGIC(524288 / 8, AT24_FLAG_ADDR16) - }, - { - .compatible = "atmel,24c1024", - .data = (void *)AT24_DEVICE_MAGIC(1048576 / 8, AT24_FLAG_ADDR16) - }, - { }, + AT24_OF_DEVICE_ID("atmel,24c00", 24c00), + AT24_OF_DEVICE_ID("atmel,24c01", 24c01), + AT24_OF_DEVICE_ID("atmel,24c02", 24c02), + AT24_OF_DEVICE_ID("atmel,spd", spd), + AT24_OF_DEVICE_ID("atmel,24c04", 24c04), + AT24_OF_DEVICE_ID("atmel,24c08", 24c08), + AT24_OF_DEVICE_ID("atmel,24c16", 24c16), + AT24_OF_DEVICE_ID("atmel,24c32", 24c32), + AT24_OF_DEVICE_ID("atmel,24c64", 24c64), + AT24_OF_DEVICE_ID("atmel,24c128", 24c128), + AT24_OF_DEVICE_ID("atmel,24c256", 24c256), + AT24_OF_DEVICE_ID("atmel,24c512", 24c512), + AT24_OF_DEVICE_ID("atmel,24c1024", 24c1024), + { /* END OF LIST */ }, }; MODULE_DEVICE_TABLE(of, at24_of_match); static const struct acpi_device_id at24_acpi_ids[] = { - { "INT3499", AT24_DEVICE_MAGIC(8192 / 8, 0) }, - { } + AT24_ACPI_DEVICE_ID(INT3499), + { /* END OF LIST */ } }; MODULE_DEVICE_TABLE(acpi, at24_acpi_ids); @@ -525,8 +521,8 @@ static unsigned int at24_get_offset_adj(u8 flags, unsigned int byte_len) static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id) { - struct at24_platform_data chip; - kernel_ulong_t magic = 0; + struct at24_platform_data chip = { 0 }; + const struct at24_chip_data *cd = NULL; bool writable; struct at24_data *at24; int err; @@ -544,28 +540,22 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id) */ if (client->dev.of_node && of_match_device(at24_of_match, &client->dev)) { - magic = (kernel_ulong_t) - of_device_get_match_data(&client->dev); + cd = of_device_get_match_data(&client->dev); } else if (id) { - magic = id->driver_data; + cd = (void *)id->driver_data; } else { const struct acpi_device_id *aid; aid = acpi_match_device(at24_acpi_ids, &client->dev); if (aid) - magic = aid->driver_data; + cd = (void *)aid->driver_data; } - if (!magic) + if (!cd) return -ENODEV; - chip.byte_len = BIT(magic & AT24_BITMASK(AT24_SIZE_BYTELEN)); - magic >>= AT24_SIZE_BYTELEN; - chip.flags = magic & AT24_BITMASK(AT24_SIZE_FLAGS); - + chip.byte_len = cd->byte_len; + chip.flags = cd->flags; at24_get_pdata(&client->dev, &chip); - - chip.setup = NULL; - chip.context = NULL; } if (!is_power_of_2(chip.byte_len)) -- 1.9.1