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at24: updates for v5.3 

- simplify the probing code by using devm_i2c_new_dummy_device()
 - simplify the code further by moving the code around a bit
 - use struct_size() instead of calculating the required structure size
   by hand
 - remove any references to now removed platform data from comments
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Merge tag 'at24-v5.3-updates-for-wolfram' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux into i2c/for-5.3

at24: updates for v5.3

- simplify the probing code by using devm_i2c_new_dummy_device()
- simplify the code further by moving the code around a bit
- use struct_size() instead of calculating the required structure size
  by hand
- remove any references to now removed platform data from comments
This commit is contained in:
Wolfram Sang 2019-06-29 13:01:34 +02:00
parent 4601db7ecf dce91ba39c
commit 504ee6b306
1 changed files with 28 additions and 58 deletions
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86
drivers/misc/eeprom/at24.c
View File

@ -507,38 +507,24 @@ static const struct at24_chip_data *at24_get_chip_data(struct device *dev)
return cdata;
}
static void at24_remove_dummy_clients(struct at24_data *at24)
{
int i;
for (i = 1; i < at24->num_addresses; i++)
i2c_unregister_device(at24->client[i].client);
}
static int at24_make_dummy_client(struct at24_data *at24, unsigned int index,
struct regmap_config *regmap_config)
{
struct i2c_client *base_client, *dummy_client;
unsigned short int addr;
struct regmap *regmap;
struct device *dev;
base_client = at24->client[0].client;
dev = &base_client->dev;
addr = base_client->addr + index;
dummy_client = i2c_new_dummy(base_client->adapter,
base_client->addr + index);
if (!dummy_client) {
dev_err(dev, "address 0x%02x unavailable\n", addr);
return -EADDRINUSE;
}
dummy_client = devm_i2c_new_dummy_device(dev, base_client->adapter,
base_client->addr + index);
if (IS_ERR(dummy_client))
return PTR_ERR(dummy_client);
regmap = devm_regmap_init_i2c(dummy_client, regmap_config);
if (IS_ERR(regmap)) {
i2c_unregister_device(dummy_client);
if (IS_ERR(regmap))
return PTR_ERR(regmap);
}
at24->client[index].client = dummy_client;
at24->client[index].regmap = regmap;
@ -580,7 +566,6 @@ static int at24_probe(struct i2c_client *client)
unsigned int i, num_addresses;
struct at24_data *at24;
struct regmap *regmap;
size_t at24_size;
bool writable;
u8 test_byte;
int err;
@ -597,8 +582,8 @@ static int at24_probe(struct i2c_client *client)
if (err)
/*
* This is slow, but we can't know all eeproms, so we better
* play safe. Specifying custom eeprom-types via platform_data
* is recommended anyhow.
* play safe. Specifying custom eeprom-types via device tree
* or properties is recommended anyhow.
*/
page_size = 1;
@ -664,8 +649,8 @@ static int at24_probe(struct i2c_client *client)
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);
at24 = devm_kzalloc(dev, struct_size(at24, client, num_addresses),
GFP_KERNEL);
if (!at24)
return -ENOMEM;
@ -693,27 +678,8 @@ 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, &regmap_config);
if (err) {
at24_remove_dummy_clients(at24);
if (err)
return err;
}
}
i2c_set_clientdata(client, at24);
/* enable runtime pm */
pm_runtime_set_active(dev);
pm_runtime_enable(dev);
/*
* Perform a one-byte test read to verify that the
* chip is functional.
*/
err = at24_read(at24, 0, &test_byte, 1);
pm_runtime_idle(dev);
if (err) {
err = -ENODEV;
goto err_clients;
}
nvmem_config.name = dev_name(dev);
@ -731,9 +697,24 @@ static int at24_probe(struct i2c_client *client)
nvmem_config.size = byte_len;
at24->nvmem = devm_nvmem_register(dev, &nvmem_config);
if (IS_ERR(at24->nvmem)) {
err = PTR_ERR(at24->nvmem);
goto err_clients;
if (IS_ERR(at24->nvmem))
return PTR_ERR(at24->nvmem);
i2c_set_clientdata(client, at24);
/* enable runtime pm */
pm_runtime_set_active(dev);
pm_runtime_enable(dev);
/*
* Perform a one-byte test read to verify that the
* chip is functional.
*/
err = at24_read(at24, 0, &test_byte, 1);
pm_runtime_idle(dev);
if (err) {
pm_runtime_disable(dev);
return -ENODEV;
}
dev_info(dev, "%u byte %s EEPROM, %s, %u bytes/write\n",
@ -741,21 +722,10 @@ static int at24_probe(struct i2c_client *client)
writable ? "writable" : "read-only", at24->write_max);
return 0;
err_clients:
at24_remove_dummy_clients(at24);
pm_runtime_disable(dev);
return err;
}
static int at24_remove(struct i2c_client *client)
{
struct at24_data *at24;
at24 = i2c_get_clientdata(client);
at24_remove_dummy_clients(at24);
pm_runtime_disable(&client->dev);
pm_runtime_set_suspended(&client->dev);