Register both buses 0 and 1 via I2C API. For now, bus 0 is used
only by eeprom on all known devices. Later patches will be needed
if this changes in the future.
Signed-off-by: Mauro Carvalho Chehab <mche...@redhat.com>
---
drivers/media/usb/em28xx/em28xx-cards.c | 29 +++++++---
drivers/media/usb/em28xx/em28xx-i2c.c | 93 ++++++++++++++++++++++-----------
drivers/media/usb/em28xx/em28xx.h | 19 +++++--
3 files changed, 97 insertions(+), 44 deletions(-)
diff --git a/drivers/media/usb/em28xx/em28xx-cards.c
b/drivers/media/usb/em28xx/em28xx-cards.c
index 16ab4d7..496b938 100644
--- a/drivers/media/usb/em28xx/em28xx-cards.c
+++ b/drivers/media/usb/em28xx/em28xx-cards.c
@@ -2235,8 +2235,8 @@ static inline void em28xx_set_model(struct em28xx *dev)
dev->board.i2c_speed = EM28XX_I2C_CLK_WAIT_ENABLE |
EM28XX_I2C_FREQ_100_KHZ;
- if (dev->board.def_i2c_bus == 1)
- dev->board.i2c_speed |= EM2874_I2C_SECONDARY_BUS_SELECT;
+ /* Should be initialized early, for I2C to work */
+ dev->def_i2c_bus = dev->board.def_i2c_bus;
}
@@ -2642,7 +2642,7 @@ static int em28xx_hint_board(struct em28xx *dev)
/* user did not request i2c scanning => do it now */
if (!dev->i2c_hash)
- em28xx_do_i2c_scan(dev);
+ em28xx_do_i2c_scan(dev, dev->def_i2c_bus);
for (i = 0; i < ARRAY_SIZE(em28xx_i2c_hash); i++) {
if (dev->i2c_hash == em28xx_i2c_hash[i].hash) {
@@ -2953,7 +2953,9 @@ void em28xx_release_resources(struct em28xx *dev)
em28xx_release_analog_resources(dev);
- em28xx_i2c_unregister(dev);
+ if (dev->def_i2c_bus)
+ em28xx_i2c_unregister(dev, 1);
+ em28xx_i2c_unregister(dev, 0);
v4l2_ctrl_handler_free(&dev->ctrl_handler);
@@ -3109,14 +3111,23 @@ static int em28xx_init_dev(struct em28xx *dev, struct
usb_device *udev,
v4l2_ctrl_handler_init(hdl, 8);
dev->v4l2_dev.ctrl_handler = hdl;
- /* register i2c bus */
- retval = em28xx_i2c_register(dev);
+ /* register i2c bus 0 */
+ retval = em28xx_i2c_register(dev, 0);
if (retval < 0) {
- em28xx_errdev("%s: em28xx_i2c_register - error [%d]!\n",
+ em28xx_errdev("%s: em28xx_i2c_register bus 0 - error [%d]!\n",
__func__, retval);
goto unregister_dev;
}
+ if (dev->def_i2c_bus) {
+ retval = em28xx_i2c_register(dev, 1);
+ if (retval < 0) {
+ em28xx_errdev("%s: em28xx_i2c_register bus 1 - error
[%d]!\n",
+ __func__, retval);
+ goto unregister_dev;
+ }
+ }
+
/*
* Default format, used for tvp5150 or saa711x output formats
*/
@@ -3186,7 +3197,9 @@ static int em28xx_init_dev(struct em28xx *dev, struct
usb_device *udev,
return 0;
fail:
- em28xx_i2c_unregister(dev);
+ if (dev->def_i2c_bus)
+ em28xx_i2c_unregister(dev, 1);
+ em28xx_i2c_unregister(dev, 0);
v4l2_ctrl_handler_free(&dev->ctrl_handler);
unregister_dev:
diff --git a/drivers/media/usb/em28xx/em28xx-i2c.c
b/drivers/media/usb/em28xx/em28xx-i2c.c
index 9086e57..ea63ac4 100644
--- a/drivers/media/usb/em28xx/em28xx-i2c.c
+++ b/drivers/media/usb/em28xx/em28xx-i2c.c
@@ -280,9 +280,22 @@ static int em28xx_i2c_check_for_device(struct em28xx *dev,
u16 addr)
static int em28xx_i2c_xfer(struct i2c_adapter *i2c_adap,
struct i2c_msg msgs[], int num)
{
- struct em28xx *dev = i2c_adap->algo_data;
+ struct em28xx_i2c_bus *i2c_bus = i2c_adap->algo_data;
+ struct em28xx *dev = i2c_bus->dev;
+ unsigned bus = i2c_bus->bus, last_bus;
int addr, rc, i, byte;
+ /* Switch I2C bus if needed */
+ last_bus = (dev->board.i2c_speed & EM2874_I2C_SECONDARY_BUS_SELECT) ?
+ 1 : 0;
+ if (bus != last_bus) {
+ if (bus == 1)
+ dev->board.i2c_speed |= EM2874_I2C_SECONDARY_BUS_SELECT;
+ else
+ dev->board.i2c_speed &=
~EM2874_I2C_SECONDARY_BUS_SELECT;
+ em28xx_write_reg(dev, EM28XX_R06_I2C_CLK, dev->board.i2c_speed);
+ }
+
if (num <= 0)
return 0;
for (i = 0; i < num; i++) {
@@ -384,7 +397,7 @@ static int em28xx_i2c_read_block(struct em28xx *dev, u16
addr, bool addr_w16,
/* Select address */
buf[0] = addr >> 8;
buf[1] = addr & 0xff;
- ret = i2c_master_send(&dev->i2c_client[dev->def_i2c_bus], buf +
!addr_w16, 1 + addr_w16);
+ ret = i2c_master_send(&dev->i2c_client[0], buf + !addr_w16, 1 +
addr_w16);
if (ret < 0)
return ret;
/* Read data */
@@ -398,7 +411,7 @@ static int em28xx_i2c_read_block(struct em28xx *dev, u16
addr, bool addr_w16,
else
rsize = remain;
- ret = i2c_master_recv(&dev->i2c_client[dev->def_i2c_bus], data,
rsize);
+ ret = i2c_master_recv(&dev->i2c_client[0], data, rsize);
if (ret < 0)
return ret;
@@ -422,10 +435,12 @@ static int em28xx_i2c_eeprom(struct em28xx *dev, u8
**eedata, u16 *eedata_len)
*eedata = NULL;
*eedata_len = 0;
- dev->i2c_client[dev->def_i2c_bus].addr = 0xa0 >> 1;
+ /* EEPROM is always on i2c bus 0 on all known devices. */
+
+ dev->i2c_client[0].addr = 0xa0 >> 1;
/* Check if board has eeprom */
- err = i2c_master_recv(&dev->i2c_client[dev->def_i2c_bus], &buf, 0);
+ err = i2c_master_recv(&dev->i2c_client[0], &buf, 0);
if (err < 0) {
em28xx_info("board has no eeprom\n");
return -ENODEV;
@@ -590,9 +605,11 @@ error:
/*
* functionality()
*/
-static u32 functionality(struct i2c_adapter *adap)
+static u32 functionality(struct i2c_adapter *i2c_adap)
{
- struct em28xx *dev = adap->algo_data;
+ struct em28xx_i2c_bus *i2c_bus = i2c_adap->algo_data;
+ struct em28xx *dev = i2c_bus->dev;
+
u32 func_flags = I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
if (dev->board.is_em2800)
func_flags &= ~I2C_FUNC_SMBUS_WRITE_BLOCK_DATA;
@@ -643,7 +660,7 @@ static char *i2c_devs[128] = {
* do_i2c_scan()
* check i2c address range for devices
*/
-void em28xx_do_i2c_scan(struct em28xx *dev)
+void em28xx_do_i2c_scan(struct em28xx *dev, unsigned bus)
{
u8 i2c_devicelist[128];
unsigned char buf;
@@ -652,55 +669,66 @@ void em28xx_do_i2c_scan(struct em28xx *dev)
memset(i2c_devicelist, 0, ARRAY_SIZE(i2c_devicelist));
for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) {
- dev->i2c_client[dev->def_i2c_bus].addr = i;
- rc = i2c_master_recv(&dev->i2c_client[dev->def_i2c_bus], &buf,
0);
+ dev->i2c_client[bus].addr = i;
+ rc = i2c_master_recv(&dev->i2c_client[bus], &buf, 0);
if (rc < 0)
continue;
i2c_devicelist[i] = i;
- em28xx_info("found i2c device @ 0x%x [%s]\n",
- i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
+ em28xx_info("found i2c device @ 0x%x on bus %d [%s]\n",
+ i << 1, bus, i2c_devs[i] ? i2c_devs[i] : "???");
}
- dev->i2c_hash = em28xx_hash_mem(i2c_devicelist,
- ARRAY_SIZE(i2c_devicelist), 32);
+ if (bus == dev->def_i2c_bus)
+ dev->i2c_hash = em28xx_hash_mem(i2c_devicelist,
+ ARRAY_SIZE(i2c_devicelist), 32);
}
/*
* em28xx_i2c_register()
* register i2c bus
*/
-int em28xx_i2c_register(struct em28xx *dev)
+int em28xx_i2c_register(struct em28xx *dev, unsigned bus)
{
int retval;
BUG_ON(!dev->em28xx_write_regs || !dev->em28xx_read_reg);
BUG_ON(!dev->em28xx_write_regs_req || !dev->em28xx_read_reg_req);
- dev->i2c_adap[dev->def_i2c_bus] = em28xx_adap_template;
- dev->i2c_adap[dev->def_i2c_bus].dev.parent = &dev->udev->dev;
- strcpy(dev->i2c_adap[dev->def_i2c_bus].name, dev->name);
- dev->i2c_adap[dev->def_i2c_bus].algo_data = dev;
- i2c_set_adapdata(&dev->i2c_adap[dev->def_i2c_bus], &dev->v4l2_dev);
- retval = i2c_add_adapter(&dev->i2c_adap[dev->def_i2c_bus]);
+ if (bus >= NUM_I2C_BUSES)
+ return -ENODEV;
+
+ dev->i2c_adap[bus] = em28xx_adap_template;
+ dev->i2c_adap[bus].dev.parent = &dev->udev->dev;
+ strcpy(dev->i2c_adap[bus].name, dev->name);
+
+ dev->i2c_bus[bus].bus = bus;
+ dev->i2c_bus[bus].dev = dev;
+ dev->i2c_adap[bus].algo_data = &dev->i2c_bus[bus];
+ i2c_set_adapdata(&dev->i2c_adap[bus], &dev->v4l2_dev);
+
+ retval = i2c_add_adapter(&dev->i2c_adap[bus]);
if (retval < 0) {
em28xx_errdev("%s: i2c_add_adapter failed! retval [%d]\n",
__func__, retval);
return retval;
}
- dev->i2c_client[dev->def_i2c_bus] = em28xx_client_template;
- dev->i2c_client[dev->def_i2c_bus].adapter =
&dev->i2c_adap[dev->def_i2c_bus];
+ dev->i2c_client[bus] = em28xx_client_template;
+ dev->i2c_client[bus].adapter = &dev->i2c_adap[bus];
- retval = em28xx_i2c_eeprom(dev, &dev->eedata, &dev->eedata_len);
- if ((retval < 0) && (retval != -ENODEV)) {
- em28xx_errdev("%s: em28xx_i2_eeprom failed! retval [%d]\n",
- __func__, retval);
+ /* Up to now, all eeproms are at bus 0 */
+ if (!bus) {
+ retval = em28xx_i2c_eeprom(dev, &dev->eedata, &dev->eedata_len);
+ if ((retval < 0) && (retval != -ENODEV)) {
+ em28xx_errdev("%s: em28xx_i2_eeprom failed! retval
[%d]\n",
+ __func__, retval);
- return retval;
+ return retval;
+ }
}
if (i2c_scan)
- em28xx_do_i2c_scan(dev);
+ em28xx_do_i2c_scan(dev, bus);
return 0;
}
@@ -709,8 +737,11 @@ int em28xx_i2c_register(struct em28xx *dev)
* em28xx_i2c_unregister()
* unregister i2c_bus
*/
-int em28xx_i2c_unregister(struct em28xx *dev)
+int em28xx_i2c_unregister(struct em28xx *dev, unsigned bus)
{
- i2c_del_adapter(&dev->i2c_adap[dev->def_i2c_bus]);
+ if (bus >= NUM_I2C_BUSES)
+ return -ENODEV;
+
+ i2c_del_adapter(&dev->i2c_adap[bus]);
return 0;
}
diff --git a/drivers/media/usb/em28xx/em28xx.h
b/drivers/media/usb/em28xx/em28xx.h
index 43eb1c6..6800992 100644
--- a/drivers/media/usb/em28xx/em28xx.h
+++ b/drivers/media/usb/em28xx/em28xx.h
@@ -375,7 +375,7 @@ struct em28xx_board {
int vchannels;
int tuner_type;
int tuner_addr;
- int def_i2c_bus; /* Default I2C bus */
+ unsigned def_i2c_bus; /* Default I2C bus */
/* i2c flags */
unsigned int tda9887_conf;
@@ -460,6 +460,13 @@ struct em28xx_fh {
enum v4l2_buf_type type;
};
+struct em28xx_i2c_bus {
+ struct em28xx *dev;
+
+ unsigned bus;
+};
+
+
/* main device struct */
struct em28xx {
/* generic device properties */
@@ -515,8 +522,10 @@ struct em28xx {
/* i2c i/o */
struct i2c_adapter i2c_adap[NUM_I2C_BUSES];
struct i2c_client i2c_client[NUM_I2C_BUSES];
+ struct em28xx_i2c_bus i2c_bus[NUM_I2C_BUSES];
+
unsigned char eeprom_addrwidth_16bit:1;
- int def_i2c_bus; /* Default I2C bus */
+ unsigned def_i2c_bus; /* Default I2C bus */
/* video for linux */
int users; /* user count for exclusive use */
@@ -638,9 +647,9 @@ struct em28xx_ops {
};
/* Provided by em28xx-i2c.c */
-void em28xx_do_i2c_scan(struct em28xx *dev);
-int em28xx_i2c_register(struct em28xx *dev);
-int em28xx_i2c_unregister(struct em28xx *dev);
+void em28xx_do_i2c_scan(struct em28xx *dev, unsigned bus);
+int em28xx_i2c_register(struct em28xx *dev, unsigned bus);
+int em28xx_i2c_unregister(struct em28xx *dev, unsigned bus);
/* Provided by em28xx-core.c */
int em28xx_read_reg_req_len(struct em28xx *dev, u8 req, u16 reg,
--
1.8.1.4
--
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