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authorWolfram Sang <wsa+renesas@sang-engineering.com>2019-04-03 15:40:10 +0300
committerWolfram Sang <wsa@the-dreams.de>2019-04-16 14:08:11 +0300
commit63b96983a5ddfedd7daea72dbbc08ea873c54f27 (patch)
treedcb74bf00cfff708620b95b6e0d1e7328f8d2106 /drivers/i2c/i2c-core-smbus.c
parent83c42212d2544625b85f44a07d0ad96323e69250 (diff)
downloadlinux-63b96983a5ddfedd7daea72dbbc08ea873c54f27.tar.xz
i2c: core: introduce callbacks for atomic transfers
We had the request to access devices very late when interrupts are not available anymore multiple times now. Mostly to prepare shutdown or reboot. Allow adapters to specify a specific callback for this case. Note that we fall back to the generic {master|smbus}_xfer callback if this new atomic one is not present. This is intentional to preserve the previous behaviour and avoid regressions. Because there are drivers not using interrupts or because it might have worked "accidently" before. Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Reviewed-by Andy Shevchenko <andriy.shevchenko@linux.intel.com> Tested-by: Stefan Lengfeld <contact@stefanchrist.eu> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'drivers/i2c/i2c-core-smbus.c')
-rw-r--r--drivers/i2c/i2c-core-smbus.c18
1 files changed, 14 insertions, 4 deletions
diff --git a/drivers/i2c/i2c-core-smbus.c b/drivers/i2c/i2c-core-smbus.c
index 357e083e8f45..fdb0fb9fb9aa 100644
--- a/drivers/i2c/i2c-core-smbus.c
+++ b/drivers/i2c/i2c-core-smbus.c
@@ -548,6 +548,9 @@ s32 __i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr,
unsigned short flags, char read_write,
u8 command, int protocol, union i2c_smbus_data *data)
{
+ int (*xfer_func)(struct i2c_adapter *adap, u16 addr,
+ unsigned short flags, char read_write,
+ u8 command, int size, union i2c_smbus_data *data);
unsigned long orig_jiffies;
int try;
s32 res;
@@ -562,13 +565,20 @@ s32 __i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr,
flags &= I2C_M_TEN | I2C_CLIENT_PEC | I2C_CLIENT_SCCB;
- if (adapter->algo->smbus_xfer) {
+ xfer_func = adapter->algo->smbus_xfer;
+ if (i2c_in_atomic_xfer_mode()) {
+ if (adapter->algo->smbus_xfer_atomic)
+ xfer_func = adapter->algo->smbus_xfer_atomic;
+ else if (adapter->algo->master_xfer_atomic)
+ xfer_func = NULL; /* fallback to I2C emulation */
+ }
+
+ if (xfer_func) {
/* Retry automatically on arbitration loss */
orig_jiffies = jiffies;
for (res = 0, try = 0; try <= adapter->retries; try++) {
- res = adapter->algo->smbus_xfer(adapter, addr, flags,
- read_write, command,
- protocol, data);
+ res = xfer_func(adapter, addr, flags, read_write,
+ command, protocol, data);
if (res != -EAGAIN)
break;
if (time_after(jiffies,