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| author |   Heiner Kallweit <hkallweit1@gmail.com> | 2021-05-24 22:15:26 +0200 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-05-27 14:49:39 +0200 |
| commit | 6601017e2a4936a93c7d9527cd25a4a2c16cc5ef (patch) | |
| tree | 8e25bad5cb20756136c88c88cf87a31ec3cf557b /drivers/misc/eeprom | |
| parent | eeprom: ee1004: Cache current page at initialization of first device only (diff) | |
| download | linux-dev-6601017e2a4936a93c7d9527cd25a4a2c16cc5ef.tar.xz linux-dev-6601017e2a4936a93c7d9527cd25a4a2c16cc5ef.zip | |
eeprom: ee1004: Factor out setting page to ee1004_set_current_page
Factor out setting the page, this makes the code better readable.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Link: https://lore.kernel.org/r/21e0966f-e6c9-045f-b130-bd9fb071f0d7@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc/eeprom')
| -rw-r--r-- | drivers/misc/eeprom/ee1004.c | 52 |
1 files changed, 30 insertions, 22 deletions
diff --git a/drivers/misc/eeprom/ee1004.c b/drivers/misc/eeprom/ee1004.c index d7c693b26d98..33855e459a40 100644 --- a/drivers/misc/eeprom/ee1004.c +++ b/drivers/misc/eeprom/ee1004.c @@ -71,6 +71,32 @@ static int ee1004_get_current_page(void) return 0; } +static int ee1004_set_current_page(struct device *dev, int page) +{ + int ret; + + if (page == ee1004_current_page) + return 0; + + /* Data is ignored */ + ret = i2c_smbus_write_byte(ee1004_set_page[page], 0x00); + /* + * Don't give up just yet. Some memory modules will select the page + * but not ack the command. Check which page is selected now. + */ + if (ret == -ENXIO && ee1004_get_current_page() == page) + ret = 0; + if (ret < 0) { + dev_err(dev, "Failed to select page %d (%d)\n", page, ret); + return ret; + } + + dev_dbg(dev, "Selected page %d\n", page); + ee1004_current_page = page; + + return 0; +} + static ssize_t ee1004_eeprom_read(struct i2c_client *client, char *buf, unsigned int offset, size_t count) { @@ -110,28 +136,10 @@ static ssize_t eeprom_read(struct file *filp, struct kobject *kobj, int status; /* Select page */ - if (page != ee1004_current_page) { - /* Data is ignored */ - status = i2c_smbus_write_byte(ee1004_set_page[page], - 0x00); - if (status == -ENXIO) { - /* - * Don't give up just yet. Some memory - * modules will select the page but not - * ack the command. Check which page is - * selected now. - */ - if (ee1004_get_current_page() == page) - status = 0; - } - if (status < 0) { - dev_err(dev, "Failed to select page %d (%d)\n", - page, status); - mutex_unlock(&ee1004_bus_lock); - return status; - } - dev_dbg(dev, "Selected page %d\n", page); - ee1004_current_page = page; + status = ee1004_set_current_page(dev, page); + if (status) { + mutex_unlock(&ee1004_bus_lock); + return status; } status = ee1004_eeprom_read(client, buf, off, count); |