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authorSylwester Nawrocki <s.nawrocki@samsung.com>2012-09-20 08:16:45 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2012-10-01 20:59:36 -0300
commit5565a2ad47cdd8e697a28137bd8379455667bc1c (patch)
treed4d7f322962faa8edd99f3f18f135cd7ebf4efe2 /drivers/media
parent05fb4da441c9197a59d537cf7f88522716287c61 (diff)
[media] m5mols: Protect driver data with a mutex
Without the locking the driver's data could get corrupted when the subdev is accessed from user space and from host driver by multiple processes. Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media')
-rw-r--r--drivers/media/i2c/m5mols/m5mols.h18
-rw-r--r--drivers/media/i2c/m5mols/m5mols_core.c77
2 files changed, 62 insertions, 33 deletions
diff --git a/drivers/media/i2c/m5mols/m5mols.h b/drivers/media/i2c/m5mols/m5mols.h
index 527e7b2965df..86c815be348c 100644
--- a/drivers/media/i2c/m5mols/m5mols.h
+++ b/drivers/media/i2c/m5mols/m5mols.h
@@ -155,8 +155,6 @@ struct m5mols_version {
* @pdata: platform data
* @sd: v4l-subdev instance
* @pad: media pad
- * @ffmt: current fmt according to resolution type
- * @res_type: current resolution type
* @irq_waitq: waitqueue for the capture
* @irq_done: set to 1 in the interrupt handler
* @handle: control handler
@@ -174,6 +172,10 @@ struct m5mols_version {
* @wdr: wide dynamic range control
* @stabilization: image stabilization control
* @jpeg_quality: JPEG compression quality control
+ * @set_power: optional power callback to the board code
+ * @lock: mutex protecting the structure fields below
+ * @ffmt: current fmt according to resolution type
+ * @res_type: current resolution type
* @ver: information of the version
* @cap: the capture mode attributes
* @isp_ready: 1 when the ISP controller has completed booting
@@ -181,14 +183,11 @@ struct m5mols_version {
* @ctrl_sync: 1 when the control handler state is restored in H/W
* @resolution: register value for current resolution
* @mode: register value for current operation mode
- * @set_power: optional power callback to the board code
*/
struct m5mols_info {
const struct m5mols_platform_data *pdata;
struct v4l2_subdev sd;
struct media_pad pad;
- struct v4l2_mbus_framefmt ffmt[M5MOLS_RESTYPE_MAX];
- int res_type;
wait_queue_head_t irq_waitq;
atomic_t irq_done;
@@ -216,6 +215,13 @@ struct m5mols_info {
struct v4l2_ctrl *stabilization;
struct v4l2_ctrl *jpeg_quality;
+ int (*set_power)(struct device *dev, int on);
+
+ struct mutex lock;
+
+ struct v4l2_mbus_framefmt ffmt[M5MOLS_RESTYPE_MAX];
+ int res_type;
+
struct m5mols_version ver;
struct m5mols_capture cap;
@@ -225,8 +231,6 @@ struct m5mols_info {
u8 resolution;
u8 mode;
-
- int (*set_power)(struct device *dev, int on);
};
#define is_available_af(__info) (__info->ver.af)
diff --git a/drivers/media/i2c/m5mols/m5mols_core.c b/drivers/media/i2c/m5mols/m5mols_core.c
index 57293aa7512b..2f490ef26c38 100644
--- a/drivers/media/i2c/m5mols/m5mols_core.c
+++ b/drivers/media/i2c/m5mols/m5mols_core.c
@@ -551,13 +551,18 @@ static int m5mols_get_fmt(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
{
struct m5mols_info *info = to_m5mols(sd);
struct v4l2_mbus_framefmt *format;
+ int ret = 0;
+
+ mutex_lock(&info->lock);
format = __find_format(info, fh, fmt->which, info->res_type);
if (!format)
- return -EINVAL;
+ fmt->format = *format;
+ else
+ ret = -EINVAL;
- fmt->format = *format;
- return 0;
+ mutex_unlock(&info->lock);
+ return ret;
}
static int m5mols_set_fmt(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
@@ -578,6 +583,7 @@ static int m5mols_set_fmt(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
if (!sfmt)
return 0;
+ mutex_lock(&info->lock);
format->code = m5mols_default_ffmt[type].code;
format->colorspace = V4L2_COLORSPACE_JPEG;
@@ -589,7 +595,8 @@ static int m5mols_set_fmt(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
info->res_type = type;
}
- return 0;
+ mutex_unlock(&info->lock);
+ return ret;
}
static int m5mols_enum_mbus_code(struct v4l2_subdev *sd,
@@ -661,20 +668,25 @@ static int m5mols_start_monitor(struct m5mols_info *info)
static int m5mols_s_stream(struct v4l2_subdev *sd, int enable)
{
struct m5mols_info *info = to_m5mols(sd);
- u32 code = info->ffmt[info->res_type].code;
+ u32 code;
+ int ret;
- if (enable) {
- int ret = -EINVAL;
+ mutex_lock(&info->lock);
+ code = info->ffmt[info->res_type].code;
+ if (enable) {
if (is_code(code, M5MOLS_RESTYPE_MONITOR))
ret = m5mols_start_monitor(info);
if (is_code(code, M5MOLS_RESTYPE_CAPTURE))
ret = m5mols_start_capture(info);
-
- return ret;
+ else
+ ret = -EINVAL;
+ } else {
+ ret = m5mols_set_mode(info, REG_PARAMETER);
}
- return m5mols_set_mode(info, REG_PARAMETER);
+ mutex_unlock(&info->lock);
+ return ret;
}
static const struct v4l2_subdev_video_ops m5mols_video_ops = {
@@ -773,6 +785,20 @@ static int m5mols_fw_start(struct v4l2_subdev *sd)
return ret;
}
+/* Execute the lens soft-landing algorithm */
+static int m5mols_auto_focus_stop(struct m5mols_info *info)
+{
+ int ret;
+
+ ret = m5mols_write(&info->sd, AF_EXECUTE, REG_AF_STOP);
+ if (!ret)
+ ret = m5mols_write(&info->sd, AF_MODE, REG_AF_POWEROFF);
+ if (!ret)
+ ret = m5mols_busy_wait(&info->sd, SYSTEM_STATUS, REG_AF_IDLE,
+ 0xff, -1);
+ return ret;
+}
+
/**
* m5mols_s_power - Main sensor power control function
*
@@ -785,29 +811,26 @@ static int m5mols_s_power(struct v4l2_subdev *sd, int on)
struct m5mols_info *info = to_m5mols(sd);
int ret;
+ mutex_lock(&info->lock);
+
if (on) {
ret = m5mols_sensor_power(info, true);
if (!ret)
ret = m5mols_fw_start(sd);
- return ret;
- }
+ } else {
+ if (is_manufacturer(info, REG_SAMSUNG_TECHWIN)) {
+ ret = m5mols_set_mode(info, REG_MONITOR);
+ if (!ret)
+ ret = m5mols_auto_focus_stop(info);
+ if (ret < 0)
+ v4l2_warn(sd, "Soft landing lens failed\n");
+ }
+ ret = m5mols_sensor_power(info, false);
- if (is_manufacturer(info, REG_SAMSUNG_TECHWIN)) {
- ret = m5mols_set_mode(info, REG_MONITOR);
- if (!ret)
- ret = m5mols_write(sd, AF_EXECUTE, REG_AF_STOP);
- if (!ret)
- ret = m5mols_write(sd, AF_MODE, REG_AF_POWEROFF);
- if (!ret)
- ret = m5mols_busy_wait(sd, SYSTEM_STATUS, REG_AF_IDLE,
- 0xff, -1);
- if (ret < 0)
- v4l2_warn(sd, "Soft landing lens failed\n");
+ info->ctrl_sync = 0;
}
- ret = m5mols_sensor_power(info, false);
- info->ctrl_sync = 0;
-
+ mutex_unlock(&info->lock);
return ret;
}
@@ -912,6 +935,8 @@ static int __devinit m5mols_probe(struct i2c_client *client,
sd->entity.type = MEDIA_ENT_T_V4L2_SUBDEV_SENSOR;
init_waitqueue_head(&info->irq_waitq);
+ mutex_init(&info->lock);
+
ret = request_irq(client->irq, m5mols_irq_handler,
IRQF_TRIGGER_RISING, MODULE_NAME, sd);
if (ret) {

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