diff options
| author |   Jonathan Corbet <corbet@lwn.net> | 2009-12-28 10:04:02 -0700 |
|---|---|---|
| committer | Jonathan Corbet <corbet@lwn.net> | 2010-05-07 17:17:37 -0600 |
| commit | b052d7f81fdd352a5d89ef1ac37a2c77f219463b (patch) | |
| tree | e4890ea37bfaa972ab2b481400e8183b74b6c604 /drivers/video | |
| parent | viafb: Turn GPIO and i2c into proper platform devices (diff) | |
| download | linux-dev-b052d7f81fdd352a5d89ef1ac37a2c77f219463b.tar.xz linux-dev-b052d7f81fdd352a5d89ef1ac37a2c77f219463b.zip | |
via: Do not attempt I/O on inactive I2C adapters
If an adapter has been configured for GPIO (or off), we should not try to
use it as an I2C port.
Cc: ScottFang@viatech.com.cn
Cc: JosephChan@via.com.tw
Cc: Harald Welte <laforge@gnumonks.org>
Acked-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Diffstat (limited to 'drivers/video')
| -rw-r--r-- | drivers/video/via/via_i2c.c | 14 | ||||
| -rw-r--r-- | drivers/video/via/via_i2c.h | 1 |
2 files changed, 11 insertions, 4 deletions
diff --git a/drivers/video/via/via_i2c.c b/drivers/video/via/via_i2c.c index 3ff60b280d88..c88450ee62ba 100644 --- a/drivers/video/via/via_i2c.c +++ b/drivers/video/via/via_i2c.c @@ -115,6 +115,8 @@ int viafb_i2c_readbyte(u8 adap, u8 slave_addr, u8 index, u8 *pdata) u8 mm1[] = {0x00}; struct i2c_msg msgs[2]; + if (!via_i2c_par[adap].is_active) + return -ENODEV; *pdata = 0; msgs[0].flags = 0; msgs[1].flags = I2C_M_RD; @@ -130,6 +132,8 @@ int viafb_i2c_writebyte(u8 adap, u8 slave_addr, u8 index, u8 data) u8 msg[2] = { index, data }; struct i2c_msg msgs; + if (!via_i2c_par[adap].is_active) + return -ENODEV; msgs.flags = 0; msgs.addr = slave_addr / 2; msgs.len = 2; @@ -142,6 +146,8 @@ int viafb_i2c_readbytes(u8 adap, u8 slave_addr, u8 index, u8 *buff, int buff_len u8 mm1[] = {0x00}; struct i2c_msg msgs[2]; + if (!via_i2c_par[adap].is_active) + return -ENODEV; msgs[0].flags = 0; msgs[1].flags = I2C_M_RD; msgs[0].addr = msgs[1].addr = slave_addr / 2; @@ -198,18 +204,18 @@ static int viafb_i2c_probe(struct platform_device *platdev) struct via_port_cfg *adap_cfg = configs++; struct via_i2c_stuff *i2c_stuff = &via_i2c_par[i]; + i2c_stuff->is_active = 0; if (adap_cfg->type == 0 || adap_cfg->mode != VIA_MODE_I2C) continue; - ret = create_i2c_bus(&i2c_stuff->adapter, &i2c_stuff->algo, adap_cfg, NULL); /* FIXME: PCIDEV */ if (ret < 0) { printk(KERN_ERR "viafb: cannot create i2c bus %u:%d\n", i, ret); - /* FIXME: properly release previous busses */ - return ret; + continue; /* Still try to make the rest */ } + i2c_stuff->is_active = 1; } return 0; @@ -225,7 +231,7 @@ static int viafb_i2c_remove(struct platform_device *platdev) * Only remove those entries in the array that we've * actually used (and thus initialized algo_data) */ - if (i2c_stuff->adapter.algo_data == &i2c_stuff->algo) + if (i2c_stuff->is_active) i2c_del_adapter(&i2c_stuff->adapter); } return 0; diff --git a/drivers/video/via/via_i2c.h b/drivers/video/via/via_i2c.h index b2332cce9d18..1d18e7d57b7f 100644 --- a/drivers/video/via/via_i2c.h +++ b/drivers/video/via/via_i2c.h @@ -26,6 +26,7 @@ struct via_i2c_stuff { u16 i2c_port; /* GPIO or I2C port */ + u16 is_active; /* Being used as I2C? */ struct i2c_adapter adapter; struct i2c_algo_bit_data algo; }; |