diff options
| author |   Wolfram Sang <wsa+renesas@sang-engineering.com> | 2018-06-29 11:12:47 +0200 |
|---|---|---|
| committer |   Wolfram Sang <wsa@the-dreams.de> | 2018-07-03 23:09:36 +0200 |
| commit | bbe899700a44af8b81dcef49f4005d9d1afe7c47 (patch) | |
| tree | d9897ddec44388b3194c2a411221a1cf392a9f11 /drivers/i2c/busses/i2c-gpio.c | |
| parent | i2c: gpio: fault-injector: refactor incomplete transfer (diff) | |
| download | linux-dev-bbe899700a44af8b81dcef49f4005d9d1afe7c47.tar.xz linux-dev-bbe899700a44af8b81dcef49f4005d9d1afe7c47.zip | |
i2c: gpio: fault-injector: add incomplete_write_byte
Add another injector for an incomplete transfer. As mentioned in the
docs, this one is important to check bus recovery algorithms with it.
Otherwise random data may be sent to devices!
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'drivers/i2c/busses/i2c-gpio.c')
| -rw-r--r-- | drivers/i2c/busses/i2c-gpio.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-gpio.c b/drivers/i2c/busses/i2c-gpio.c index b69bb46bdb9d..ac00b8e08251 100644 --- a/drivers/i2c/busses/i2c-gpio.c +++ b/drivers/i2c/busses/i2c-gpio.c @@ -143,6 +143,25 @@ static int fops_incomplete_addr_phase_set(void *data, u64 addr) } DEFINE_DEBUGFS_ATTRIBUTE(fops_incomplete_addr_phase, NULL, fops_incomplete_addr_phase_set, "%llu\n"); +static int fops_incomplete_write_byte_set(void *data, u64 addr) +{ + struct i2c_gpio_private_data *priv = data; + u32 pattern; + + if (addr > 0x7f) + return -EINVAL; + + /* ADDR (7 bit) + WR (1 bit) + Client ACK (1 bit) */ + pattern = (addr << 2) | 1; + /* 0x00 (8 bit) + Client ACK, keep SDA hi (1 bit) */ + pattern = (pattern << 9) | 1; + + i2c_gpio_incomplete_transfer(priv, pattern, 18); + + return 0; +} +DEFINE_DEBUGFS_ATTRIBUTE(fops_incomplete_write_byte, NULL, fops_incomplete_write_byte_set, "%llu\n"); + static void i2c_gpio_fault_injector_init(struct platform_device *pdev) { struct i2c_gpio_private_data *priv = platform_get_drvdata(pdev); @@ -166,6 +185,8 @@ static void i2c_gpio_fault_injector_init(struct platform_device *pdev) debugfs_create_file_unsafe("sda", 0600, priv->debug_dir, priv, &fops_sda); debugfs_create_file_unsafe("incomplete_address_phase", 0200, priv->debug_dir, priv, &fops_incomplete_addr_phase); + debugfs_create_file_unsafe("incomplete_write_byte", 0200, priv->debug_dir, + priv, &fops_incomplete_write_byte); } static void i2c_gpio_fault_injector_exit(struct platform_device *pdev) |