[PATCH 18/21] eeprom: at24: refactor at24_probe()

From: Bartosz Golaszewski
Date: Mon Mar 19 2018 - 05:19:31 EST


The code in at24_probe() is pretty mangled. It can be cleaned up a bit
by doing things one by one.

Let's group the code by logic: parse and verify pdata, initialize the
regmap, allocate and fill the fields of at24_data, allocate dummy i2c
devices, initialize pm & register with nvmem.

Signed-off-by: Bartosz Golaszewski <brgl@xxxxxxxx>
---
drivers/misc/eeprom/at24.c | 34 ++++++++++++++++++----------------
1 file changed, 18 insertions(+), 16 deletions(-)

diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c
index 4888999a62cc..f67f5f626617 100644
--- a/drivers/misc/eeprom/at24.c
+++ b/drivers/misc/eeprom/at24.c
@@ -563,6 +563,7 @@ static int at24_probe(struct i2c_client *client)
struct device *dev = &client->dev;
unsigned int i, num_addresses;
struct at24_data *at24;
+ struct regmap *regmap;
size_t at24_size;
bool writable;
u8 test_byte;
@@ -572,6 +573,11 @@ static int at24_probe(struct i2c_client *client)
if (err)
return err;

+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C) &&
+ !i2c_check_functionality(client->adapter,
+ I2C_FUNC_SMBUS_WRITE_I2C_BLOCK))
+ pdata.page_size = 1;
+
if (!pdata.page_size) {
dev_err(dev, "page_size must not be 0!\n");
return -EINVAL;
@@ -579,21 +585,26 @@ static int at24_probe(struct i2c_client *client)
if (!is_power_of_2(pdata.page_size))
dev_warn(dev, "page_size looks suspicious (no power of 2)!\n");

- if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C) &&
- !i2c_check_functionality(client->adapter,
- I2C_FUNC_SMBUS_WRITE_I2C_BLOCK))
- pdata.page_size = 1;
-
if (pdata.flags & AT24_FLAG_TAKE8ADDR)
num_addresses = 8;
else
num_addresses = DIV_ROUND_UP(pdata.byte_len,
(pdata.flags & AT24_FLAG_ADDR16) ? 65536 : 256);

+ if ((pdata.flags & AT24_FLAG_SERIAL) && (pdata.flags & AT24_FLAG_MAC)) {
+ dev_err(dev,
+ "invalid device data - cannot have both AT24_FLAG_SERIAL & AT24_FLAG_MAC.");
+ return -EINVAL;
+ }
+
regmap_config.val_bits = 8;
regmap_config.reg_bits = (pdata.flags & AT24_FLAG_ADDR16) ? 16 : 8;
regmap_config.disable_locking = true;

+ regmap = devm_regmap_init_i2c(client, &regmap_config);
+ if (IS_ERR(regmap))
+ return PTR_ERR(regmap);
+
at24_size = sizeof(*at24) + num_addresses * sizeof(struct at24_client);
at24 = devm_kzalloc(dev, at24_size, GFP_KERNEL);
if (!at24)
@@ -605,22 +616,13 @@ static int at24_probe(struct i2c_client *client)
at24->flags = pdata.flags;
at24->num_addresses = num_addresses;
at24->offset_adj = at24_get_offset_adj(pdata.flags, pdata.byte_len);
+ at24->client[0].client = client;
+ at24->client[0].regmap = regmap;

at24->wp_gpio = devm_gpiod_get_optional(dev, "wp", GPIOD_OUT_HIGH);
if (IS_ERR(at24->wp_gpio))
return PTR_ERR(at24->wp_gpio);

- at24->client[0].client = client;
- at24->client[0].regmap = devm_regmap_init_i2c(client, &regmap_config);
- if (IS_ERR(at24->client[0].regmap))
- return PTR_ERR(at24->client[0].regmap);
-
- if ((pdata.flags & AT24_FLAG_SERIAL) && (pdata.flags & AT24_FLAG_MAC)) {
- dev_err(dev,
- "invalid device data - cannot have both AT24_FLAG_SERIAL & AT24_FLAG_MAC.");
- return -EINVAL;
- }
-
writable = !(pdata.flags & AT24_FLAG_READONLY);
if (writable) {
at24->write_max = min_t(unsigned int,
--
2.16.1