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[media] adv7180: Do implicit register paging

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The ad7180 has multiple register pages which can be switched between by
writing to a register. Currently the driver manually switches between pages
whenever a register outside of the default register map is accessed and
switches back after it has been accessed. This is a bit tedious and also
potential source for bugs.

This patch adds two helper functions that take care of switching between
pages and reading/writing the register. The register numbers for registers
are updated to encode both the page (in the upper 8-bits) and the register
(in the lower 8-bits) numbers.

Having multiple pages means that a register access is not a single atomic
i2c_smbus_write_byte_data() or i2c_smbus_read_byte_data() call and we need
to make sure that concurrent register access does not race against each
other.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Federico Vaga <federico.vaga@gmail.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Lars-Peter Clausen 2015-01-23 12:52:24 -03:00 committed by Mauro Carvalho Chehab
parent 029d617791
commit 3999e5d01d
1 changed files with 105 additions and 101 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

206
drivers/media/i2c/adv7180.c
View File

@ -31,7 +31,7 @@
#include <media/v4l2-ctrls.h>
#include <linux/mutex.h>
#define ADV7180_REG_INPUT_CONTROL 0x00
#define ADV7180_REG_INPUT_CONTROL 0x0000
#define ADV7180_INPUT_CONTROL_AD_PAL_BG_NTSC_J_SECAM 0x00
#define ADV7180_INPUT_CONTROL_AD_PAL_BG_NTSC_J_SECAM_PED 0x10
#define ADV7180_INPUT_CONTROL_AD_PAL_N_NTSC_J_SECAM 0x20
@ -50,28 +50,28 @@
#define ADV7180_INPUT_CONTROL_PAL_SECAM_PED 0xf0
#define ADV7180_INPUT_CONTROL_INSEL_MASK 0x0f
#define ADV7180_REG_EXTENDED_OUTPUT_CONTROL 0x04
#define ADV7180_REG_EXTENDED_OUTPUT_CONTROL 0x0004
#define ADV7180_EXTENDED_OUTPUT_CONTROL_NTSCDIS 0xC5
#define ADV7180_REG_AUTODETECT_ENABLE 0x07
#define ADV7180_AUTODETECT_DEFAULT 0x7f
/* Contrast */
#define ADV7180_REG_CON 0x08 /*Unsigned */
#define ADV7180_REG_CON 0x0008 /*Unsigned */
#define ADV7180_CON_MIN 0
#define ADV7180_CON_DEF 128
#define ADV7180_CON_MAX 255
/* Brightness*/
#define ADV7180_REG_BRI 0x0a /*Signed */
#define ADV7180_REG_BRI 0x000a /*Signed */
#define ADV7180_BRI_MIN -128
#define ADV7180_BRI_DEF 0
#define ADV7180_BRI_MAX 127
/* Hue */
#define ADV7180_REG_HUE 0x0b /*Signed, inverted */
#define ADV7180_REG_HUE 0x000b /*Signed, inverted */
#define ADV7180_HUE_MIN -127
#define ADV7180_HUE_DEF 0
#define ADV7180_HUE_MAX 128
#define ADV7180_REG_CTRL 0x0e
#define ADV7180_REG_CTRL 0x000e
#define ADV7180_CTRL_IRQ_SPACE 0x20
#define ADV7180_REG_PWR_MAN 0x0f
@ -79,7 +79,7 @@
#define ADV7180_PWR_MAN_OFF 0x24
#define ADV7180_PWR_MAN_RES 0x80
#define ADV7180_REG_STATUS1 0x10
#define ADV7180_REG_STATUS1 0x0010
#define ADV7180_STATUS1_IN_LOCK 0x01
#define ADV7180_STATUS1_AUTOD_MASK 0x70
#define ADV7180_STATUS1_AUTOD_NTSM_M_J 0x00
@ -91,33 +91,33 @@
#define ADV7180_STATUS1_AUTOD_PAL_COMB 0x60
#define ADV7180_STATUS1_AUTOD_SECAM_525 0x70
#define ADV7180_REG_IDENT 0x11
#define ADV7180_REG_IDENT 0x0011
#define ADV7180_ID_7180 0x18
#define ADV7180_REG_ICONF1 0x40
#define ADV7180_REG_ICONF1 0x0040
#define ADV7180_ICONF1_ACTIVE_LOW 0x01
#define ADV7180_ICONF1_PSYNC_ONLY 0x10
#define ADV7180_ICONF1_ACTIVE_TO_CLR 0xC0
/* Saturation */
#define ADV7180_REG_SD_SAT_CB 0xe3 /*Unsigned */
#define ADV7180_REG_SD_SAT_CR 0xe4 /*Unsigned */
#define ADV7180_REG_SD_SAT_CB 0x00e3 /*Unsigned */
#define ADV7180_REG_SD_SAT_CR 0x00e4 /*Unsigned */
#define ADV7180_SAT_MIN 0
#define ADV7180_SAT_DEF 128
#define ADV7180_SAT_MAX 255
#define ADV7180_IRQ1_LOCK 0x01
#define ADV7180_IRQ1_UNLOCK 0x02
#define ADV7180_REG_ISR1 0x42
#define ADV7180_REG_ICR1 0x43
#define ADV7180_REG_IMR1 0x44
#define ADV7180_REG_IMR2 0x48
#define ADV7180_REG_ISR1 0x0042
#define ADV7180_REG_ICR1 0x0043
#define ADV7180_REG_IMR1 0x0044
#define ADV7180_REG_IMR2 0x0048
#define ADV7180_IRQ3_AD_CHANGE 0x08
#define ADV7180_REG_ISR3 0x4A
#define ADV7180_REG_ICR3 0x4B
#define ADV7180_REG_IMR3 0x4C
#define ADV7180_REG_ISR3 0x004A
#define ADV7180_REG_ICR3 0x004B
#define ADV7180_REG_IMR3 0x004C
#define ADV7180_REG_IMR4 0x50
#define ADV7180_REG_NTSC_V_BIT_END 0xE6
#define ADV7180_REG_NTSC_V_BIT_END 0x00E6
#define ADV7180_NTSC_V_BIT_END_MANUAL_NVEND 0x4F
struct adv7180_state {
@ -129,11 +129,41 @@ struct adv7180_state {
bool autodetect;
bool powered;
u8 input;
struct i2c_client *client;
unsigned int register_page;
};
#define to_adv7180_sd(_ctrl) (&container_of(_ctrl->handler, \
struct adv7180_state, \
ctrl_hdl)->sd)
static int adv7180_select_page(struct adv7180_state *state, unsigned int page)
{
if (state->register_page != page) {
i2c_smbus_write_byte_data(state->client, ADV7180_REG_CTRL,
page);
state->register_page = page;
}
return 0;
}
static int adv7180_write(struct adv7180_state *state, unsigned int reg,
unsigned int value)
{
lockdep_assert_held(&state->mutex);
adv7180_select_page(state, reg >> 8);
return i2c_smbus_write_byte_data(state->client, reg & 0xff, value);
}
static int adv7180_read(struct adv7180_state *state, unsigned int reg)
{
lockdep_assert_held(&state->mutex);
adv7180_select_page(state, reg >> 8);
return i2c_smbus_read_byte_data(state->client, reg & 0xff);
}
static v4l2_std_id adv7180_std_to_v4l2(u8 status1)
{
/* in case V4L2_IN_ST_NO_SIGNAL */
@ -193,10 +223,10 @@ static u32 adv7180_status_to_v4l2(u8 status1)
return 0;
}
static int __adv7180_status(struct i2c_client *client, u32 *status,
static int __adv7180_status(struct adv7180_state *state, u32 *status,
v4l2_std_id *std)
{
int status1 = i2c_smbus_read_byte_data(client, ADV7180_REG_STATUS1);
int status1 = adv7180_read(state, ADV7180_REG_STATUS1);
if (status1 < 0)
return status1;
@ -225,7 +255,7 @@ static int adv7180_querystd(struct v4l2_subdev *sd, v4l2_std_id *std)
if (!state->autodetect || state->irq > 0)
*std = state->curr_norm;
else
err = __adv7180_status(v4l2_get_subdevdata(sd), NULL, std);
err = __adv7180_status(state, NULL, std);
mutex_unlock(&state->mutex);
return err;
@ -236,7 +266,6 @@ static int adv7180_s_routing(struct v4l2_subdev *sd, u32 input,
{
struct adv7180_state *state = to_state(sd);
int ret = mutex_lock_interruptible(&state->mutex);
struct i2c_client *client = v4l2_get_subdevdata(sd);
if (ret)
return ret;
@ -247,13 +276,12 @@ static int adv7180_s_routing(struct v4l2_subdev *sd, u32 input,
if ((input & ADV7180_INPUT_CONTROL_INSEL_MASK) != input)
goto out;
ret = i2c_smbus_read_byte_data(client, ADV7180_REG_INPUT_CONTROL);
ret = adv7180_read(state, ADV7180_REG_INPUT_CONTROL);
if (ret < 0)
goto out;
ret &= ~ADV7180_INPUT_CONTROL_INSEL_MASK;
ret = i2c_smbus_write_byte_data(client,
ADV7180_REG_INPUT_CONTROL, ret | input);
ret = adv7180_write(state, ADV7180_REG_INPUT_CONTROL, ret | input);
state->input = input;
out:
mutex_unlock(&state->mutex);
@ -267,7 +295,7 @@ static int adv7180_g_input_status(struct v4l2_subdev *sd, u32 *status)
if (ret)
return ret;
ret = __adv7180_status(v4l2_get_subdevdata(sd), status, NULL);
ret = __adv7180_status(state, status, NULL);
mutex_unlock(&state->mutex);
return ret;
}
@ -275,30 +303,27 @@ static int adv7180_g_input_status(struct v4l2_subdev *sd, u32 *status)
static int adv7180_s_std(struct v4l2_subdev *sd, v4l2_std_id std)
{
struct adv7180_state *state = to_state(sd);
struct i2c_client *client = v4l2_get_subdevdata(sd);
int ret = mutex_lock_interruptible(&state->mutex);
if (ret)
return ret;
/* all standards -> autodetect */
if (std == V4L2_STD_ALL) {
ret =
i2c_smbus_write_byte_data(client, ADV7180_REG_INPUT_CONTROL,
ADV7180_INPUT_CONTROL_AD_PAL_BG_NTSC_J_SECAM
| state->input);
ret = adv7180_write(state, ADV7180_REG_INPUT_CONTROL,
ADV7180_INPUT_CONTROL_AD_PAL_BG_NTSC_J_SECAM
| state->input);
if (ret < 0)
goto out;
__adv7180_status(client, NULL, &state->curr_norm);
__adv7180_status(state, NULL, &state->curr_norm);
state->autodetect = true;
} else {
ret = v4l2_std_to_adv7180(std);
if (ret < 0)
goto out;
ret = i2c_smbus_write_byte_data(client,
ADV7180_REG_INPUT_CONTROL,
ret | state->input);
ret = adv7180_write(state, ADV7180_REG_INPUT_CONTROL,
ret | state->input);
if (ret < 0)
goto out;
@ -311,8 +336,7 @@ out:
return ret;
}
static int adv7180_set_power(struct adv7180_state *state,
struct i2c_client *client, bool on)
static int adv7180_set_power(struct adv7180_state *state, bool on)
{
u8 val;
@ -321,20 +345,19 @@ static int adv7180_set_power(struct adv7180_state *state,
else
val = ADV7180_PWR_MAN_OFF;
return i2c_smbus_write_byte_data(client, ADV7180_REG_PWR_MAN, val);
return adv7180_write(state, ADV7180_REG_PWR_MAN, val);
}
static int adv7180_s_power(struct v4l2_subdev *sd, int on)
{
struct adv7180_state *state = to_state(sd);
struct i2c_client *client = v4l2_get_subdevdata(sd);
int ret;
ret = mutex_lock_interruptible(&state->mutex);
if (ret)
return ret;
ret = adv7180_set_power(state, client, on);
ret = adv7180_set_power(state, on);
if (ret == 0)
state->powered = on;
@ -346,7 +369,6 @@ static int adv7180_s_ctrl(struct v4l2_ctrl *ctrl)
{
struct v4l2_subdev *sd = to_adv7180_sd(ctrl);
struct adv7180_state *state = to_state(sd);
struct i2c_client *client = v4l2_get_subdevdata(sd);
int ret = mutex_lock_interruptible(&state->mutex);
int val;
@ -355,26 +377,24 @@ static int adv7180_s_ctrl(struct v4l2_ctrl *ctrl)
val = ctrl->val;
switch (ctrl->id) {
case V4L2_CID_BRIGHTNESS:
ret = i2c_smbus_write_byte_data(client, ADV7180_REG_BRI, val);
ret = adv7180_write(state, ADV7180_REG_BRI, val);
break;
case V4L2_CID_HUE:
/*Hue is inverted according to HSL chart */
ret = i2c_smbus_write_byte_data(client, ADV7180_REG_HUE, -val);
ret = adv7180_write(state, ADV7180_REG_HUE, -val);
break;
case V4L2_CID_CONTRAST:
ret = i2c_smbus_write_byte_data(client, ADV7180_REG_CON, val);
ret = adv7180_write(state, ADV7180_REG_CON, val);
break;
case V4L2_CID_SATURATION:
/*
*This could be V4L2_CID_BLUE_BALANCE/V4L2_CID_RED_BALANCE
*Let's not confuse the user, everybody understands saturation
*/
ret = i2c_smbus_write_byte_data(client, ADV7180_REG_SD_SAT_CB,
val);
ret = adv7180_write(state, ADV7180_REG_SD_SAT_CB, val);
if (ret < 0)
break;
ret = i2c_smbus_write_byte_data(client, ADV7180_REG_SD_SAT_CR,
val);
ret = adv7180_write(state, ADV7180_REG_SD_SAT_CR, val);
break;
default:
ret = -EINVAL;
@ -483,114 +503,96 @@ static const struct v4l2_subdev_ops adv7180_ops = {
static irqreturn_t adv7180_irq(int irq, void *devid)
{
struct adv7180_state *state = devid;
struct i2c_client *client = v4l2_get_subdevdata(&state->sd);
u8 isr3;
mutex_lock(&state->mutex);
i2c_smbus_write_byte_data(client, ADV7180_REG_CTRL,
ADV7180_CTRL_IRQ_SPACE);
isr3 = i2c_smbus_read_byte_data(client, ADV7180_REG_ISR3);
isr3 = adv7180_read(state, ADV7180_REG_ISR3);
/* clear */
i2c_smbus_write_byte_data(client, ADV7180_REG_ICR3, isr3);
i2c_smbus_write_byte_data(client, ADV7180_REG_CTRL, 0);
adv7180_write(state, ADV7180_REG_ICR3, isr3);
if (isr3 & ADV7180_IRQ3_AD_CHANGE && state->autodetect)
__adv7180_status(client, NULL, &state->curr_norm);
__adv7180_status(state, NULL, &state->curr_norm);
mutex_unlock(&state->mutex);
return IRQ_HANDLED;
}
static int init_device(struct i2c_client *client, struct adv7180_state *state)
static int init_device(struct adv7180_state *state)
{
int ret;
mutex_lock(&state->mutex);
/* Initialize adv7180 */
/* Enable autodetection */
if (state->autodetect) {
ret =
i2c_smbus_write_byte_data(client, ADV7180_REG_INPUT_CONTROL,
ret = adv7180_write(state, ADV7180_REG_INPUT_CONTROL,
ADV7180_INPUT_CONTROL_AD_PAL_BG_NTSC_J_SECAM
| state->input);
if (ret < 0)
return ret;
goto out_unlock;
ret =
i2c_smbus_write_byte_data(client,
ADV7180_REG_AUTODETECT_ENABLE,
ret = adv7180_write(state, ADV7180_REG_AUTODETECT_ENABLE,
ADV7180_AUTODETECT_DEFAULT);
if (ret < 0)
return ret;
goto out_unlock;
} else {
ret = v4l2_std_to_adv7180(state->curr_norm);
if (ret < 0)
return ret;
goto out_unlock;
ret =
i2c_smbus_write_byte_data(client, ADV7180_REG_INPUT_CONTROL,
ret = adv7180_write(state, ADV7180_REG_INPUT_CONTROL,
ret | state->input);
if (ret < 0)
return ret;
goto out_unlock;
}
/* ITU-R BT.656-4 compatible */
ret = i2c_smbus_write_byte_data(client,
ADV7180_REG_EXTENDED_OUTPUT_CONTROL,
ret = adv7180_write(state, ADV7180_REG_EXTENDED_OUTPUT_CONTROL,
ADV7180_EXTENDED_OUTPUT_CONTROL_NTSCDIS);
if (ret < 0)
return ret;
goto out_unlock;
/* Manually set V bit end position in NTSC mode */
ret = i2c_smbus_write_byte_data(client,
ADV7180_REG_NTSC_V_BIT_END,
ret = adv7180_write(state, ADV7180_REG_NTSC_V_BIT_END,
ADV7180_NTSC_V_BIT_END_MANUAL_NVEND);
if (ret < 0)
return ret;
goto out_unlock;
/* read current norm */
__adv7180_status(client, NULL, &state->curr_norm);
__adv7180_status(state, NULL, &state->curr_norm);
/* register for interrupts */
if (state->irq > 0) {
ret = i2c_smbus_write_byte_data(client, ADV7180_REG_CTRL,
ADV7180_CTRL_IRQ_SPACE);
if (ret < 0)
goto err;
/* config the Interrupt pin to be active low */
ret = i2c_smbus_write_byte_data(client, ADV7180_REG_ICONF1,
ret = adv7180_write(state, ADV7180_REG_ICONF1,
ADV7180_ICONF1_ACTIVE_LOW |
ADV7180_ICONF1_PSYNC_ONLY);
if (ret < 0)
goto err;
goto out_unlock;
ret = i2c_smbus_write_byte_data(client, ADV7180_REG_IMR1, 0);
ret = adv7180_write(state, ADV7180_REG_IMR1, 0);
if (ret < 0)
goto err;
goto out_unlock;
ret = i2c_smbus_write_byte_data(client, ADV7180_REG_IMR2, 0);
ret = adv7180_write(state, ADV7180_REG_IMR2, 0);
if (ret < 0)
goto err;
goto out_unlock;
/* enable AD change interrupts interrupts */
ret = i2c_smbus_write_byte_data(client, ADV7180_REG_IMR3,
ret = adv7180_write(state, ADV7180_REG_IMR3,
ADV7180_IRQ3_AD_CHANGE);
if (ret < 0)
goto err;
goto out_unlock;
ret = i2c_smbus_write_byte_data(client, ADV7180_REG_IMR4, 0);
ret = adv7180_write(state, ADV7180_REG_IMR4, 0);
if (ret < 0)
goto err;
ret = i2c_smbus_write_byte_data(client, ADV7180_REG_CTRL,
0);
if (ret < 0)
goto err;
goto out_unlock;
}
return 0;
out_unlock:
mutex_unlock(&state->mutex);
err:
return ret;
}
@ -612,6 +614,8 @@ static int adv7180_probe(struct i2c_client *client,
if (state == NULL)
return -ENOMEM;
state->client = client;
state->irq = client->irq;
mutex_init(&state->mutex);
state->autodetect = true;
@ -623,7 +627,7 @@ static int adv7180_probe(struct i2c_client *client,
ret = adv7180_init_controls(state);
if (ret)
goto err_unreg_subdev;
ret = init_device(client, state);
ret = init_device(state);
if (ret)
goto err_free_ctrl;
@ -678,7 +682,7 @@ static int adv7180_suspend(struct device *dev)
struct v4l2_subdev *sd = i2c_get_clientdata(client);
struct adv7180_state *state = to_state(sd);
return adv7180_set_power(state, client, false);
return adv7180_set_power(state, false);
}
static int adv7180_resume(struct device *dev)
@ -689,11 +693,11 @@ static int adv7180_resume(struct device *dev)
int ret;
if (state->powered) {
ret = adv7180_set_power(state, client, true);
ret = adv7180_set_power(state, true);
if (ret)
return ret;
}
ret = init_device(client, state);
ret = init_device(state);
if (ret < 0)
return ret;
return 0;