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author | Linus Torvalds <torvalds@linux-foundation.org> | 2016-10-07 14:12:21 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-10-07 14:12:21 -0700 |
commit | 87840a2b7e048018d18d60bdac5c09224de85370 (patch) | |
tree | 87e9f8a2317e39358f5ea189d79ef2158de5faf8 /drivers/misc/eeprom | |
parent | 2ab704a47e0f27df758840a589aec3298dbb98dd (diff) | |
parent | 662786a5429c3a992c6f884a647ee32424822358 (diff) | |
download | linux-87840a2b7e048018d18d60bdac5c09224de85370.tar.gz linux-87840a2b7e048018d18d60bdac5c09224de85370.tar.bz2 linux-87840a2b7e048018d18d60bdac5c09224de85370.zip |
Merge branch 'i2c/for-4.9' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux
Pull i2c updates from Wolfram Sang:
"Here is the 4.9 pull request from I2C including:
- centralized error messages when registering to the core
- improved lockdep annotations to prevent false positives
- DT support for muxes, gates, and arbitrators
- bus speeds can now be obtained from ACPI
- i2c-octeon got refactored and now supports ThunderX SoCs, too
- i2c-tegra and i2c-designware got a bigger bunch of updates
- a couple of standard driver fixes and improvements"
* 'i2c/for-4.9' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: (71 commits)
i2c: axxia: disable clks in case of failure in probe
i2c: octeon: thunderx: Limit register access retries
i2c: uniphier-f: fix misdetection of incomplete STOP condition
gpio: pca953x: variable 'id' was used twice
i2c: i801: Add support for Kaby Lake PCH-H
gpio: pca953x: fix an incorrect lockdep warning
i2c: add a warning to i2c_adapter_depth()
lockdep: make MAX_LOCKDEP_SUBCLASSES unconditionally visible
i2c: export i2c_adapter_depth()
i2c: rk3x: Fix variable 'min_total_ns' unused warning
i2c: rk3x: Fix sparse warning
i2c / ACPI: Do not touch an I2C device if it belongs to another adapter
i2c: octeon: Fix high-level controller status check
i2c: octeon: Avoid sending STOP during recovery
i2c: octeon: Fix set SCL recovery function
i2c: rcar: add support for r8a7796 (R-Car M3-W)
i2c: imx: make bus recovery through pinctrl optional
i2c: meson: add gxbb compatible string
i2c: uniphier-f: set the adapter to master mode when probing
i2c: uniphier-f: avoid WARN_ON() of clk_disable() in failure path
...
Diffstat (limited to 'drivers/misc/eeprom')
-rw-r--r-- | drivers/misc/eeprom/at24.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c index 3cdf8e1ca0ad..051b14766ef9 100644 --- a/drivers/misc/eeprom/at24.c +++ b/drivers/misc/eeprom/at24.c @@ -593,6 +593,7 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id) struct at24_data *at24; int err; unsigned i, num_addresses; + u8 test_byte; if (client->dev.platform_data) { chip = *(struct at24_platform_data *)client->dev.platform_data; @@ -743,6 +744,18 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id) } } + i2c_set_clientdata(client, at24); + + /* + * Perform a one-byte test read to verify that the + * chip is functional. + */ + err = at24_read(at24, 0, &test_byte, 1); + if (err) { + err = -ENODEV; + goto err_clients; + } + at24->nvmem_config.name = dev_name(&client->dev); at24->nvmem_config.dev = &client->dev; at24->nvmem_config.read_only = !writable; @@ -764,8 +777,6 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id) goto err_clients; } - i2c_set_clientdata(client, at24); - dev_info(&client->dev, "%u byte %s EEPROM, %s, %u bytes/write\n", chip.byte_len, client->name, writable ? "writable" : "read-only", at24->write_max); |