This patch adds the driver for the as3645a LED flash controller. This
controller supports a high power led in flash and torch modes and an
indicator light, sometimes also called privacy light.
Signed-off-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
Signed-off-by: Nayden Kanchev <nkanchev@xxxxxxxxxx>
Signed-off-by: Tuukka Toivonen <tuukkat76@xxxxxxxxx>
Signed-off-by: Antti Koskipaa <antti.koskipaa@xxxxxxxxx>
Signed-off-by: Stanimir Varbanov <svarbanov@xxxxxxxxxx>
Signed-off-by: Vimarsh Zutshi <vimarsh.zutshi@xxxxxxxxx>
Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxx>
Signed-off-by: Ivan T. Ivanov <iivanov@xxxxxxxxxx>
Signed-off-by: Mika Westerberg <ext-mika.1.westerberg@xxxxxxxxx>
Signed-off-by: David Cohen <dacohen@xxxxxxxxx>
---
drivers/media/video/Kconfig | 7 +
drivers/media/video/Makefile | 1 +
drivers/media/video/as3645a.c | 1425 +++++++++++++++++++++++++++++++++++++++++
include/linux/as3645a.h | 36 +
include/media/as3645a.h | 69 ++
5 files changed, 1538 insertions(+), 0 deletions(-)
create mode 100644 drivers/media/video/as3645a.c
create mode 100644 include/linux/as3645a.h
create mode 100644 include/media/as3645a.h
diff --git a/drivers/media/video/Kconfig b/drivers/media/video/Kconfig
index c1c4aed..d01c670 100644
--- a/drivers/media/video/Kconfig
+++ b/drivers/media/video/Kconfig
@@ -505,6 +505,13 @@ config VIDEO_ADP1653
This is a driver for the ADP1653 flash controller. It is used for
example in Nokia N900.
+config VIDEO_AS3645A
+ tristate "AS3645A flash driver support"
+ depends on I2C && VIDEO_V4L2 && MEDIA_CONTROLLER
+ ---help---
+ This is a driver for the AS3645A flash chip. It has build in control
+ for Flash, Torch and Indicator LEDs.
+
comment "Video improvement chips"
config VIDEO_UPD64031A
diff --git a/drivers/media/video/Makefile b/drivers/media/video/Makefile
index a1bfd06..e0b495a 100644
--- a/drivers/media/video/Makefile
+++ b/drivers/media/video/Makefile
@@ -72,6 +72,7 @@ obj-$(CONFIG_VIDEO_SR030PC30) += sr030pc30.o
obj-$(CONFIG_VIDEO_NOON010PC30) += noon010pc30.o
obj-$(CONFIG_VIDEO_M5MOLS) += m5mols/
obj-$(CONFIG_VIDEO_ADP1653) += adp1653.o
+obj-$(CONFIG_VIDEO_AS3645A) += as3645a.o
obj-$(CONFIG_SOC_CAMERA_IMX074) += imx074.o
obj-$(CONFIG_SOC_CAMERA_MT9M001) += mt9m001.o
diff --git a/drivers/media/video/as3645a.c b/drivers/media/video/as3645a.c
new file mode 100644
index 0000000..6e8adf8
--- /dev/null
+++ b/drivers/media/video/as3645a.c
@@ -0,0 +1,1425 @@
+/*
+ * drivers/media/video/as3645a.c
+ *
+ * Copyright (C) 2008-2011 Nokia Corporation
+ *
+ * Contact: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ * NOTES:
+ * - Inductor peak current limit setting fixed to 1.75A
+ * - VREF offset fixed to 0V
+ *
+ * TODO:
+ * - Check hardware FSTROBE control when sensor driver add support for this
+ *
+ */
+
+#include <linux/i2c.h>
+#include <linux/version.h>
+#include <linux/sysfs.h>
+#include <linux/as3645a.h>
+#include <linux/ktime.h>
+#include <linux/delay.h>
+#include <linux/timer.h>
+#include <linux/mutex.h>
+
+#include <media/as3645a.h>
+
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-event.h>
+
+#define AS_TIMER_MS_TO_CODE(t) (((t) - 100) / 50)
+#define AS_TIMER_CODE_TO_MS(c) (50 * (c) + 100)
+
+/* Register definitions */
+
+/* Read-only Design info register: Reset state: xxxx 0001 - for Senna */
+#define AS_DESIGN_INFO_REG 0x00
+#define AS_DESIGN_INFO_FACTORY(x) (((x) >> 4))
+#define AS_DESIGN_INFO_MODEL(x) ((x) & 0x0f)
+
+/* Read-only Version control register: Reset state: 0000 0000
+ * for first engineering samples
+ */
+#define AS_VERSION_CONTROL_REG 0x01
+#define AS_VERSION_CONTROL_RFU(x) (((x) >> 4))
+#define AS_VERSION_CONTROL_VERSION(x) ((x) & 0x0f)
+
+/* Read / Write (Indicator and timer register): Reset state: 0000 1111 */
+#define AS_INDICATOR_AND_TIMER_REG 0x02
+#define AS_INDICATOR_AND_TIMER_TIMEOUT_SHIFT 0
+#define AS_INDICATOR_AND_TIMER_VREF_SHIFT 4
+#define AS_INDICATOR_AND_TIMER_INDICATOR_SHIFT 6
+
+/* Read / Write (Current set register): Reset state: 0110 1001 */
+#define AS_CURRENT_SET_REG 0x03
+#define AS_CURRENT_ASSIST_LIGHT_SHIFT 0
+#define AS_CURRENT_LED_DET_ON (1 << 3)
+#define AS_CURRENT_FLASH_CURRENT_SHIFT 4
+
+/* Read / Write (Control register): Reset state: 1011 0100 */
+#define AS_CONTROL_REG 0x04
+#define AS_CONTROL_MODE_SETTING_SHIFT 0
+#define AS_CONTROL_STROBE_ON (1 << 2)
+#define AS_CONTROL_OUT_ON (1 << 3)
+#define AS_CONTROL_EXT_TORCH_ON (1 << 4)
+#define AS_CONTROL_STROBE_TYPE_EDGE (0 << 5)
+#define AS_CONTROL_STROBE_TYPE_LEVEL (1 << 5)
+#define AS_CONTROL_COIL_PEAK_SHIFT 6
+
+/* Read only (D3 is read / write) (Fault and info): Reset state: 0000 x000 */
+#define AS_FAULT_INFO_REG 0x05
+#define AS_FAULT_INFO_INDUCTOR_PEAK_LIMIT (1 << 1)
+#define AS_FAULT_INFO_INDICATOR_LED (1 << 2)
+#define AS_FAULT_INFO_LED_AMOUNT (1 << 3)
+#define AS_FAULT_INFO_TIMEOUT (1 << 4)
+#define AS_FAULT_INFO_OVER_TEMPERATURE (1 << 5)
+#define AS_FAULT_INFO_SHORT_CIRCUIT (1 << 6)
+#define AS_FAULT_INFO_OVER_VOLTAGE (1 << 7)
+
+/* Boost register */
+#define AS_BOOST_REG 0x0d
+#define AS_BOOST_CURRENT_DISABLE (0 << 0)
+#define AS_BOOST_CURRENT_ENABLE (1 << 0)
+
+/* Password register is used to unlock boost register writing */
+#define AS_PASSWORD_REG 0x0f
+#define AS_PASSWORD_UNLOCK_VALUE 0x55
+
+/* AS_CONTROL_EXT_TORCH_ON - on, 0 - off */
+#define TORCH_IN_STANDBY 0
+
+#define AS3645A_FLASH_TIMEOUT_MIN 100000 /* us */
+#define AS3645A_FLASH_TIMEOUT_MAX 850000
+#define AS3645A_FLASH_TIMEOUT_STEP 50000
+
+#define AS3645A_FLASH_INTENSITY_MIN 200 /* mA */
+#define AS3645A_FLASH_INTENSITY_MAX_1LED 500
+#define AS3645A_FLASH_INTENSITY_MAX_2LEDS 400
+#define AS3645A_FLASH_INTENSITY_STEP 20
+
+#define AS3645A_TORCH_INTENSITY_MIN 20 /* mA */
+#define AS3645A_TORCH_INTENSITY_MAX 160
+#define AS3645A_TORCH_INTENSITY_STEP 20
+
+#define AS3645A_INDICATOR_INTENSITY_MIN 0 /* uA */
+#define AS3645A_INDICATOR_INTENSITY_MAX 10000
+#define AS3645A_INDICATOR_INTENSITY_STEP 2500
+
+enum as_mode {
+ AS_MODE_EXT_TORCH = 0 << AS_CONTROL_MODE_SETTING_SHIFT,
+ AS_MODE_INDICATOR = 1 << AS_CONTROL_MODE_SETTING_SHIFT,
+ AS_MODE_ASSIST = 2 << AS_CONTROL_MODE_SETTING_SHIFT,
+ AS_MODE_FLASH = 3 << AS_CONTROL_MODE_SETTING_SHIFT,
+};
+
+enum as_state {
+ AS_STATE_READY = V4L2_FLASH_READY,
+ AS_STATE_COOLDOWN = V4L2_FLASH_COOLDOWN,
+ AS_STATE_FLASH = 2,
+};
+
+/*
+ * struct as3645a
+ *
+ * @subdev: V4L2 subdev
+ * @platform_data: Flash platform data
+ * @power_lock: Protects power_count
+ * @power_count: Power reference count
+ * @vref: VREF offset (0=0V, 1=+0.3V, 2=-0.3V, 3=+0.6V)
+ * @peak: Inductor peak current limit (0=1.25A, 1=1.5A, 2=1.75A,
+ * 3=2.0A)
+ * @led_mode: V4L2 flash LED mode
+ * @timeout: Flash timeout in microseconds
+ * @flash_current: Flash current (0=200mA ... 15=500mA). Maximum
+ * values are 400mA for two LEDs and 500mA for one LED.
+ * @assist_current: Torch/Assist light current (0=20mA, 1=40mA ... 7=160mA)
+ * @indicator_current: Indicator LED current (0=0mA, 1=2.5mA ... 4=10mA)
+ * @strobe_source: Flash strobe source (software or external)
+ * @active: Whether the torch/flash output is active. The state is
+ * updated in software when turning the output on or off,
+ * as well as when a timeout occurs.
+ * @led_state: State of the torch/flash output as controlled by
+ * software. This doesn't take timeouts into account.
+ * @mode: Output mode (external torch, flash, assist or indicator)
+ * @timer: Flash timeout and cooldown state machine timer
+ * @state: Flash state (ready, flash, cooldown)
+ * @state_lock: Protects the state
+ * @action_start: Time stamp of last initiated action (ON/OFF)
+ * @flash_count: Number of times the flash has been triggered
+ * @flash_on_time: Total flash mode on-time
+ * @flash_off_time: Total off time
+ * @torch_on_time: Total torch/assist mode on-time since last cooldown
+ */
+struct as3645a {
+ struct v4l2_subdev subdev;
+ struct as3645a_platform_data *platform_data;
+
+ struct mutex power_lock;
+ int power_count;
+
+ /* Static parameters */
+ u8 vref;
+ u8 peak;
+
+ /* Controls */
+ struct v4l2_ctrl_handler ctrls;
+
+ enum v4l2_flash_led_mode led_mode;
+ unsigned int timeout;
+ u8 flash_current;
+ u8 assist_current;
+ u8 indicator_current;
+ enum v4l2_flash_strobe_source strobe_source;
+
+ /* State */
+ bool active;
+ bool led_state;
+ enum as_mode mode;
+
+ struct timer_list timer;
+ enum as_state state;
+ spinlock_t state_lock;
+
+ /* Overheat protection */
+ ktime_t action_start;
+ unsigned int flash_count;
+ unsigned int flash_on_time;
+ unsigned int flash_off_time;
+ unsigned int torch_on_time;
+};
+
+#define to_as3645a(sd) container_of(sd, struct as3645a, subdev)
+
+/* When sequencal flash are made duty cycle must be less than 10% from 1024 */
+#define MAX_DUTY_CYCLE_PERCENTAGE 102
+
+/* When preflash is used, flash must be turned off for at least 40 ms */
+#define PRE_FLASH_OFF 40
+
+/* Maximum sequent flashes without duty cycle calculation between them.
+ * This number includes: Pre flash and Main Flash
+ */
+#define MAX_SEQ_FLASHES 2
+
+/* Minimum cooling time after flash sequence. It is calculated for 10%
+ * duty cucle and both Pre and Main flashes are 150ms.
+ * Total time = (150 + 150) * 100 / 10
+ * Time = Total time - (150 + 150) = 2700 ms
+ * This number includes: Pre flash and Main Flash
+ */
+#define MIN_COOLING_TIME 2700
+
+/* Maximum AF assist light duration.
+ */
+#define MAX_ASSIST_LIGHT_TIME 2500
+
+/* Number of supported v4l2 events */
+#define AS3645A_FLASH_NEVENTS 1
+
+/* Return negative errno else zero on success */
+static int as3645a_write(struct as3645a *flash, u8 addr, u8 val)
+{
+ struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev);
+ int rval;
+
+ rval = i2c_smbus_write_byte_data(client, addr, val);
+
+ dev_dbg(&client->dev, "Write Addr:%02X Val:%02X %s\n", addr, val,
+ rval < 0 ? "fail" : "ok");
+
+ return rval;
+}
+
+/* Return negative errno else a data byte received from the device. */
+static int as3645a_read(struct as3645a *flash, u8 addr)
+{
+ struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev);
+ int rval;
+
+ rval = i2c_smbus_read_byte_data(client, addr);
+
+ dev_dbg(&client->dev, "Read Addr:%02X Val:%02X %s\n", addr, rval,
+ rval < 0 ? "fail" : "ok");
+
+ return rval;
+}
+
+/* -----------------------------------------------------------------------------
+ * Overheat protection
+ *
+ * Common flash usage use cases can't be supported if overheat protection
+ * requirements are enforced on individual actions. The driver thus covers
+ * complete flash sequences when enforcing overheat protection.
+ *
+ * - Flash duty cycle must be no higher than 10%. However, as pre-flash/flash
+ * sequences wouldn't be possible in that case, we allow higher duty cycles
+ * for sequences of at most MAX_SEQ_FLASHES consecutive flash strobes. A
+ * minimum PRE_FLASH_OFF off-time must be observed between flash strobes
+ * inside a sequence, but no duty cycle requirement is enforced.
+ *
+ * If the off-time between flash strobes exceeds 600ms, the strobes are not
+ * considered part of a single sequence and the duty cycle requirement
+ * applies.
+ *
+ * Duty cycles are defined as the ratio between total on-time and the sum of
+ * total on-time and last off-time. In the following flash sequence
+ *
+ * Assist (T1 = 1s) -> Off (D1 = 100ms) ->
+ * Pre-Flash (F1 = 70ms) -> Off (D2 = 50ms) -> Main Flash (F2 = 150ms) ->
+ * Off (cooldown, C = ?)
+ *
+ * the minimum cooldown time can be computed with
+ *
+ * Duty cycle = (F1 + F2) / (F1 + F2 + C)
+ * C > (F1 + F2) / Duty cycle - (F1 + F2)
+ * C > (70 + 150) * 9
+ * C > 1980 ms
+ *
+ * - If the LED is used in torch/assist mode for more than
+ * MAX_ASSIST_LIGHT_TIME, a minimum cooldown of MIN_COOLING_TIME must be
+ * enforced before firing the flash. This cooldown period only applies when
+ * firing the flash, not when turning torch/assist mode on.
+ *
+ * For the purpose of this requirement, the torch/assist mode on-time is
+ * computed as the total torch/assist mode on-time since the last off-time
+ * longer than MIN_COOLING_TIME.
+ */
+
+/*
+ * as3645a_overheat_update_timing - Update flash timing parameters
+ * @flash: The flash
+ *
+ * Update the flash on-time, flash off-time and torch/assist on-time based on
+ * the last flash action.
+ */
+static void as3645a_overheat_update_timing(struct as3645a *flash)
+{
+ unsigned int duration;
+ ktime_t time;
+
+ time = ktime_get();
+ duration = ktime_to_us(ktime_sub(time, flash->action_start));
+ duration /= 1000;
+ flash->action_start = time;
+
+ /* Compute the on- and off-time since the last action. On-time is
+ * cumulative, while off-time accounts for the last off-time only.
+ *
+ * If a hardware timeout occurred, on-time is increased by the timeout
+ * value and off time is set to the action duration minus the timeout
+ * value.
+ */
+ if (flash->led_state && !flash->active) {
+ /* Hardware timeout */
+ unsigned int on_time = flash->timeout / 1000;
+ flash->flash_on_time += on_time;
+ flash->flash_off_time = duration > on_time
+ ? duration - on_time : 0;
+ } else if (flash->led_state) {
+ if (flash->mode == AS_MODE_FLASH)
+ flash->flash_on_time += duration;
+ flash->flash_off_time = 0;
+ } else {
+ flash->flash_off_time += duration;
+ }
+
+ /* Update the total torch/assist mode on-time since the last off-time
+ * longer than MIN_COOLING_TIME. Torch/assist on-time is reset when
+ * the flash has been strobed.
+ */
+ if (flash->mode == AS_MODE_ASSIST && flash->led_state)
+ flash->torch_on_time += duration;
+ else if ((flash->mode == AS_MODE_FLASH && flash->led_state) ||
+ (duration >= MIN_COOLING_TIME))
+ flash->torch_on_time = 0;
+}
+
+/*
+ * as3645a_overheat_check_duty_cycle - Check the flash duty cycle requirement
+ * @flash: The flash
+ *
+ * Return 0 if the duty cycle requirement has been fullfilled, or a negative
+ * error code otherwise.
+ */
+static int as3645a_overheat_check_duty_cycle(struct as3645a *flash)
+{
+ unsigned int duty_cycle;
+ unsigned int total_time;
+
+ total_time = flash->flash_on_time + flash->flash_off_time;
+ if (!total_time)
+ return -ETIME;
+
+ duty_cycle = flash->flash_on_time * 1024 / total_time;
+ if (duty_cycle > MAX_DUTY_CYCLE_PERCENTAGE)
+ return -EBUSY;
+
+ return 0;
+}
+
+/*
+ * as3545a_overheat_torch_prepare - Prepare torch/assist mode
+ * @flash: The flash
+ *
+ * Return 0 if torch/assist mode can be turned on now, or a negative error code
+ * if the overheat protection requirements are not fullfilled.
+ */
+static int as3645a_overheat_torch_prepare(struct as3645a *flash)
+{
+ /* When switching from flash mode to torch/assist mode, make sure the
+ * flash duty cycle requirements are fullfilled.
+ */
+ if (flash->mode != AS_MODE_FLASH)
+ return 0;
+
+ return as3645a_overheat_check_duty_cycle(flash);
+}
+
+/*
+ * as3545a_overheat_flash_prepare - Prepare flash mode
+ * @flash: The flash
+ *
+ * Return 0 if the flash can be strobed now, or a negative error code if the
+ * overheat protection requirements are not fullfilled.
+ */
+static int as3645a_overheat_flash_prepare(struct as3645a *flash)
+{
+ int ret;
+
+ /* If too many flash strobes have been recorded, or if the last flash
+ * strobe ended more than 600ms ago, consider the flash sequence as
+ * finished and enfore duty cycle requirements.
+ */
+ if ((flash->flash_count && flash->flash_off_time > 600) ||
+ flash->flash_count == MAX_SEQ_FLASHES) {
+ ret = as3645a_overheat_check_duty_cycle(flash);
+ if (ret < 0)
+ return ret;
+ }
+
+ if (flash->flash_count && flash->flash_off_time < PRE_FLASH_OFF)
+ return -EBUSY;
+
+ if (flash->torch_on_time > MAX_ASSIST_LIGHT_TIME)
+ return -EBUSY;
+
+ return 0;
+}
+
+/*
+ * as3645a_overheat_protect - Enforce overheat protection
+ * @flash: The flash
+ * @mode: Desired output mode
+ * @on: Desired output state
+ */
+static int
+as3645a_overheat_protect(struct as3645a *flash, enum as_mode mode, int on)
+{
+ int ret;
+
+ if (!on && !flash->led_state)
+ return 0;
+
+ as3645a_overheat_update_timing(flash);
+
+ /* Overheat protection is only needed in torch/assist and flash modes,
+ * and only when turning the output on.
+ */
+ if ((mode != AS_MODE_ASSIST && mode != AS_MODE_FLASH) || !on)
+ return 0;
+
+ if (mode == AS_MODE_FLASH)
+ ret = as3645a_overheat_flash_prepare(flash);
+ else
+ ret = as3645a_overheat_torch_prepare(flash);
+
+ if (ret < 0)
+ return ret;
+
+ if (mode != AS_MODE_FLASH || flash->flash_count == MAX_SEQ_FLASHES ||
+ (flash->flash_count && flash->flash_off_time > 600)) {
+ flash->flash_count = 0;
+ flash->flash_on_time = 0;
+ flash->flash_off_time = 0;
+ }
+
+ return 0;
+}
+
+/* -----------------------------------------------------------------------------
+ * State machine
+ */
+
+static void as3645a_state_event_queue(struct as3645a *flash, u32 status)
+{
+ struct video_device *vdev = &flash->subdev.devnode;
+ struct v4l2_event event;
+
+ memset(&event, 0, sizeof(event));
+ event.type = V4L2_EVENT_STATUS_CHANGED;
+ memcpy(event.u.data, &status, sizeof(status));
+ v4l2_event_queue(vdev, &event);
+}
+
+static void as3645a_state_setup_timer(struct as3645a *flash, enum as_state new)
+{
+ if (new == AS_STATE_FLASH) {
+ mod_timer(&flash->timer, jiffies +
+ msecs_to_jiffies(DIV_ROUND_UP(flash->timeout, 1000)));
+ return;
+ }
+
+ if (flash->led_mode == V4L2_FLASH_LED_MODE_TORCH) {
+ /* In torch mode, just wait for MIN_COOLING_TIME */
+ mod_timer(&flash->timer, jiffies +
+ msecs_to_jiffies(MIN_COOLING_TIME));
+ return;
+ }
+
+ /* When cooling down after flash, wait for PRE_FLASH_OFF if we haven't
+ * exceeded the maximum number of sequential flashes, or for a duration
+ * based on the maximum duty cycle requirement otherwise.
+ */
+ if (flash->flash_count < MAX_SEQ_FLASHES) {
+ mod_timer(&flash->timer, jiffies +
+ msecs_to_jiffies(PRE_FLASH_OFF));
+ } else {
+ u32 ttime, cooling_time;
+
+ ttime = flash->flash_on_time + flash->timeout / 1000;
+ cooling_time = (ttime * 1024 / MAX_DUTY_CYCLE_PERCENTAGE)
+ - ttime;
+
+ mod_timer(&flash->timer, jiffies +
+ msecs_to_jiffies(cooling_time));
+ }
+}
+
+static void __as3645a_set_state(struct as3645a *flash, enum as_state new)
+{
+ if (new == flash->state)
+ return;
+
+ if (new == AS_STATE_READY || new == AS_STATE_COOLDOWN)
+ as3645a_state_event_queue(flash, new);
+
+ flash->state = new;
+
+ if (new == AS_STATE_FLASH || new == AS_STATE_COOLDOWN)
+ as3645a_state_setup_timer(flash, new);
+}
+
+static void as3645a_set_state(struct as3645a *flash, enum as_state new)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&flash->state_lock, flags);
+ __as3645a_set_state(flash, new);
+ spin_unlock_irqrestore(&flash->state_lock, flags);
+}
+
+static enum as_state as3645a_get_state(struct as3645a *flash)
+{
+ enum as_state state;
+ unsigned long flags;
+
+ spin_lock_irqsave(&flash->state_lock, flags);
+ state = flash->state;
+ spin_unlock_irqrestore(&flash->state_lock, flags);
+
+ return state;
+}
+
+/* This software timer updates the flash state machine */
+static void as3645_state_timer_func(unsigned long flash_priv)
+{
+ struct as3645a *flash = (struct as3645a *)flash_priv;
+ unsigned long flags;
+
+ spin_lock_irqsave(&flash->state_lock, flags);
+
+ switch (flash->state) {
+ case AS_STATE_FLASH:
+ __as3645a_set_state(flash, AS_STATE_COOLDOWN);
+ flash->active = false;
+ break;
+ case AS_STATE_COOLDOWN:
+ __as3645a_set_state(flash, AS_STATE_READY);
+ break;
+ default:
+ break;
+ }
+
+ spin_unlock_irqrestore(&flash->state_lock, flags);
+}
+
+static bool as3645a_is_active(struct as3645a *flash)
+{
+ return as3645a_read(flash, AS_CONTROL_REG) & AS_CONTROL_OUT_ON;
+}
+
+static bool as3645a_is_ready(struct as3645a *flash)
+{
+ return as3645a_get_state(flash) == AS_STATE_READY;
+}
+
+/* -----------------------------------------------------------------------------
+ * Hardware configuration and trigger
+ */
+
+/*
+ * as3645a_set_config - Set flash configuration registers
+ * @flash: The flash
+ *
+ * Configure the hardware with flash, assist and indicator currents, as well as
+ * flash timeout.
+ *
+ * Return 0 on success, or a negative error code if an I2C communication error
+ * occurred.
+ */
+static int as3645a_set_config(struct as3645a *flash)
+{
+ int ret;
+ u8 val;
+
+ val = (flash->flash_current << AS_CURRENT_FLASH_CURRENT_SHIFT)
+ | (flash->assist_current << AS_CURRENT_ASSIST_LIGHT_SHIFT)
+ | AS_CURRENT_LED_DET_ON;
+
+ ret = as3645a_write(flash, AS_CURRENT_SET_REG, val);
+ if (ret < 0)
+ return ret;
+
+ if (flash->strobe_source == V4L2_FLASH_STROBE_SOURCE_EXTERNAL) {
+ /* Use timeout to protect the flash in case the external
+ * strobe gets stuck. Minimum value 100 ms, maximum 850 ms.
+ */
+ u32 timeout = DIV_ROUND_UP(flash->timeout, 1000);
+ timeout = max_t(u32, DIV_ROUND_UP(timeout, 50) * 50, 100);
+ val = AS_TIMER_MS_TO_CODE(timeout)
+ << AS_INDICATOR_AND_TIMER_TIMEOUT_SHIFT;
+ } else {
+ val = AS_TIMER_MS_TO_CODE(flash->timeout / 1000)
+ << AS_INDICATOR_AND_TIMER_TIMEOUT_SHIFT;
+ }
+
+ val |= (flash->vref << AS_INDICATOR_AND_TIMER_VREF_SHIFT)
+ | ((flash->indicator_current ? flash->indicator_current - 1 : 0)
+ << AS_INDICATOR_AND_TIMER_INDICATOR_SHIFT);
+
+ return as3645a_write(flash, AS_INDICATOR_AND_TIMER_REG, val);
+}
+
+/*
+ * as3645a_set_control - Set flash control register
+ * @flash: The flash
+ * @mode: Desired output mode
+ * @on: Desired output state
+ *
+ * Configure the hardware with output mode and state.
+ *
+ * Return 0 on success, or a negative error code if an I2C communication error
+ * occurred.
+ */
+static int
+as3645a_set_control(struct as3645a *flash, enum as_mode mode, bool on)
+{
+ u8 reg;
+
+ /* Configure output parameters and operation mode. */
+ reg = (flash->peak << AS_CONTROL_COIL_PEAK_SHIFT)
+ | TORCH_IN_STANDBY
+ | (on ? AS_CONTROL_OUT_ON : 0)
+ | mode;
+
+ if (flash->led_mode == V4L2_FLASH_LED_MODE_FLASH &&
+ flash->strobe_source == V4L2_FLASH_STROBE_SOURCE_EXTERNAL) {
+ if (flash->platform_data->setup_ext_strobe)
+ flash->platform_data->setup_ext_strobe(1);
+ reg |= AS_CONTROL_STROBE_TYPE_LEVEL
+ | AS_CONTROL_STROBE_ON;
+ }
+
+ return as3645a_write(flash, AS_CONTROL_REG, reg);
+}
+
+/*
+ * as3645a_set_output - Configure output and operation mode
+ * @flash: Flash controller
+ * @strobe: Strobe the flash (only valid in flash mode)
+ *
+ * Turn the LEDs output on/off and set the operation mode based on the current
+ * parameters.
+ *
+ * The AS3645A can't control the indicator LED independently of the flash/torch
+ * LED. If the flash controller is in V4L2_FLASH_LED_MODE_NONE mode, set the
+ * chip to indicator mode. Otherwise set it to assist light (torch) or flash
+ * mode.
+ *
+ * In indicator and assist modes, turn the output on/off based on the indicator
+ * and torch currents. In software strobe flash mode, turn the output on/off
+ * based on the strobe parameter.
+ */
+static int as3645a_set_output(struct as3645a *flash, bool strobe)
+{
+ struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev);
+ enum as_mode mode;
+ bool on;
+ int ret;
+
+ switch (flash->led_mode) {
+ case V4L2_FLASH_LED_MODE_NONE:
+ on = flash->indicator_current != 0;
+ mode = AS_MODE_INDICATOR;
+ break;
+ case V4L2_FLASH_LED_MODE_TORCH:
+ on = true;
+ mode = AS_MODE_ASSIST;
+ break;
+ case V4L2_FLASH_LED_MODE_FLASH:
+ on = strobe;
+ mode = AS_MODE_FLASH;
+ break;
+ default:
+ return 0;
+ }
+
+ /* Make sure we won't overheat if we perform the requested action. */
+ ret = as3645a_overheat_protect(flash, mode, on);
+ if (ret) {
+ dev_dbg(&client->dev, "Flash overheat protection triggered\n");
+ return ret;
+ }
+
+ /* Configure output parameters and operation mode. */
+ ret = as3645a_set_control(flash, mode, on);
+ if (ret < 0)
+ return ret;
+
+ /* Update the flash state. Move to
+ * - AS_STATE_FLASH when the flash is strobed
+ * - AS_STATE_COOLDOWN when turning the output off after a flash strobe
+ * or after a long torch time
+ * - AS_STATE_READY when turning the output off otherwise
+ */
+ if (flash->led_mode == V4L2_FLASH_LED_MODE_FLASH && strobe) {
+ as3645a_set_state(flash, AS_STATE_FLASH);
+ flash->flash_count++;
+ } else if (flash->active && !on) {
+ if (flash->torch_on_time > MAX_ASSIST_LIGHT_TIME ||
+ flash->mode == AS_MODE_FLASH)
+ as3645a_set_state(flash, AS_STATE_COOLDOWN);
+ else
+ as3645a_set_state(flash, AS_STATE_READY);
+ }
+
+ flash->mode = mode;
+ if (flash->led_mode == V4L2_FLASH_LED_MODE_FLASH ||
+ flash->led_mode == V4L2_FLASH_LED_MODE_TORCH) {
+ flash->led_state = on;
+ flash->active = on;
+ } else {
+ flash->led_state = false;
+ flash->active = false;
+ }
+
+ return 0;
+}
+
+/* -----------------------------------------------------------------------------
+ * V4L2 controls
+ */
+
+static int as3645a_read_fault(struct as3645a *flash)
+{
+ struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev);
+ int rval;
+
+ /* NOTE: reading register clear fault status */
+ rval = as3645a_read(flash, AS_FAULT_INFO_REG);
+ if (rval < 0)
+ return rval;
+
+ if (rval & AS_FAULT_INFO_INDUCTOR_PEAK_LIMIT)
+ dev_err(&client->dev, "Inductor Peak limit fault\n");
+
+ if (rval & AS_FAULT_INFO_INDICATOR_LED)
+ dev_err(&client->dev, "Indicator LED fault: "
+ "Short circuit or open loop\n");
+
+ dev_dbg(&client->dev, "%u connected LEDs\n",
+ rval & AS_FAULT_INFO_LED_AMOUNT ? 2 : 1);
+
+ if (rval & AS_FAULT_INFO_TIMEOUT)
+ dev_err(&client->dev, "Timeout fault\n");
+
+ if (rval & AS_FAULT_INFO_OVER_TEMPERATURE)
+ dev_err(&client->dev, "Over temperature fault\n");
+
+ if (rval & AS_FAULT_INFO_SHORT_CIRCUIT)
+ dev_err(&client->dev, "Short circuit fault\n");
+
+ if (rval & AS_FAULT_INFO_OVER_VOLTAGE)
+ dev_err(&client->dev, "Over voltage fault: "
+ "Indicates missing capacitor or open connection\n");
+
+ if (rval & ~AS_FAULT_INFO_INDICATOR_LED)
+ dev_dbg(&client->dev, "Senna: No faults, nice\n");
+
+ return rval;
+}
+
+static int as3645a_get_ctrl(struct v4l2_ctrl *ctrl)
+{
+ struct as3645a *flash =
+ container_of(ctrl->handler, struct as3645a, ctrls);
+ struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev);
+ int fault;
+
+ switch (ctrl->id) {
+ case V4L2_CID_FLASH_FAULT:
+ fault = as3645a_read_fault(flash);
+ if (fault < 0)
+ return fault;
+
+ if (fault & AS_FAULT_INFO_SHORT_CIRCUIT)
+ ctrl->cur.val |= V4L2_FLASH_FAULT_SHORT_CIRCUIT;
+ if (fault & AS_FAULT_INFO_OVER_TEMPERATURE)
+ ctrl->cur.val |= V4L2_FLASH_FAULT_OVER_TEMPERATURE;
+ if (fault & AS_FAULT_INFO_TIMEOUT)
+ ctrl->cur.val |= V4L2_FLASH_FAULT_TIMEOUT;
+ if (fault & AS_FAULT_INFO_OVER_VOLTAGE)
+ ctrl->cur.val |= V4L2_FLASH_FAULT_OVER_VOLTAGE;
+ if (fault & AS_FAULT_INFO_INDUCTOR_PEAK_LIMIT)
+ ctrl->cur.val |= V4L2_FLASH_FAULT_OVER_CURRENT;
+ if (fault & AS_FAULT_INFO_INDICATOR_LED)
+ ctrl->cur.val |= V4L2_FLASH_FAULT_INDICATOR;
+ break;
+
+ case V4L2_CID_FLASH_READY:
+ ctrl->cur.val = 0;
+ if (!as3645a_is_active(flash) && as3645a_is_ready(flash))
+ ctrl->cur.val = 1;
+ break;
+
+ case V4L2_CID_FLASH_STROBE_STATUS:
+ ctrl->cur.val = (flash->led_mode == V4L2_FLASH_LED_MODE_FLASH)
+ && flash->active;
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ dev_dbg(&client->dev, "G_CTRL %08x:%d\n", ctrl->id, ctrl->cur.val);
+
+ return 0;
+}
+
+static int as3645a_set_ctrl(struct v4l2_ctrl *ctrl)
+{
+ struct as3645a *flash =
+ container_of(ctrl->handler, struct as3645a, ctrls);
+ struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev);
+ int ret;
+
+ dev_dbg(&client->dev, "S_CTRL %08x:%d\n", ctrl->id, ctrl->val);
+
+ /* If a control that doesn't apply to the current mode is modified,
+ * we store the value and return immediately. The setting will be
+ * applied when the LED mode is changed. Otherwise we apply the setting
+ * immediately.
+ */
+
+ switch (ctrl->id) {
+ case V4L2_CID_FLASH_LED_MODE:
+ if (flash->indicator_current)
+ return -EBUSY;
+
+ ret = as3645a_set_config(flash);
+ if (ret < 0)
+ return ret;
+
+ flash->led_mode = ctrl->val;
+ return as3645a_set_output(flash, false);
+
+ case V4L2_CID_FLASH_STROBE_SOURCE:
+ flash->strobe_source = ctrl->val;
+
+ /* Applies to flash mode only. */
+ if (flash->led_mode != V4L2_FLASH_LED_MODE_FLASH)
+ break;
+
+ return as3645a_set_output(flash, false);
+
+ case V4L2_CID_FLASH_STROBE:
+ if (flash->led_mode != V4L2_FLASH_LED_MODE_FLASH)
+ return -EBUSY;
+
+ return as3645a_set_output(flash, true);
+
+ case V4L2_CID_FLASH_STROBE_STOP:
+ if (flash->led_mode != V4L2_FLASH_LED_MODE_FLASH)
+ return -EBUSY;
+
+ return as3645a_set_output(flash, false);
+
+ case V4L2_CID_FLASH_TIMEOUT:
+ /* This is ugly. The step value is different depending on strobe
+ * mode, so only round the value when using I2C strobing.
+ */
+ if (flash->strobe_source == V4L2_FLASH_STROBE_SOURCE_EXTERNAL &&
+ flash->platform_data->set_strobe_width != NULL) {
+ flash->platform_data->set_strobe_width(ctrl->val);
+ } else {
+ if (ctrl->val < AS3645A_FLASH_TIMEOUT_MIN)
+ ctrl->val = AS3645A_FLASH_TIMEOUT_MIN;
+ ctrl->val = ctrl->val / AS3645A_FLASH_TIMEOUT_STEP
+ * AS3645A_FLASH_TIMEOUT_STEP;
+ }
+ flash->timeout = ctrl->val;
+
+ /* Applies to flash mode only. */
+ if (flash->led_mode != V4L2_FLASH_LED_MODE_FLASH)
+ break;
+
+ return as3645a_set_config(flash);
+
+ case V4L2_CID_FLASH_INTENSITY:
+ flash->flash_current = (ctrl->val - AS3645A_FLASH_INTENSITY_MIN)
+ / AS3645A_FLASH_INTENSITY_STEP;
+
+ /* Applies to flash mode only. */
+ if (flash->led_mode != V4L2_FLASH_LED_MODE_FLASH)
+ break;
+
+ return as3645a_set_config(flash);
+
+ case V4L2_CID_FLASH_TORCH_INTENSITY:
+ flash->assist_current =
+ (ctrl->val - AS3645A_TORCH_INTENSITY_MIN)
+ / AS3645A_TORCH_INTENSITY_STEP;
+
+ /* Applies to torch mode only. */
+ if (flash->led_mode != V4L2_FLASH_LED_MODE_TORCH)
+ break;
+
+ return as3645a_set_config(flash);
+
+ case V4L2_CID_FLASH_INDICATOR_INTENSITY:
+ if (flash->led_mode != V4L2_FLASH_LED_MODE_NONE)
+ return -EBUSY;
+
+ flash->indicator_current =
+ (ctrl->val - AS3645A_INDICATOR_INTENSITY_MIN)
+ / AS3645A_INDICATOR_INTENSITY_STEP;
+
+ ret = as3645a_set_config(flash);
+ if (ret < 0)
+ return ret;
+
+ if ((ctrl->val == 0) == (ctrl->cur.val == 0))
+ break;
+
+ return as3645a_set_output(flash, false);
+
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static const struct v4l2_ctrl_ops as3645a_ctrl_ops = {
+ .g_volatile_ctrl = as3645a_get_ctrl,
+ .s_ctrl = as3645a_set_ctrl,
+};
+
+/* -----------------------------------------------------------------------------
+ * V4L2 subdev core operations
+ */
+
+/* Put device into know state. */
+static int as3645a_setup(struct as3645a *flash)
+{
+ struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev);
+ int ret;
+
+ /* clear errors */
+ ret = as3645a_read(flash, AS_FAULT_INFO_REG);
+ if (ret < 0)
+ return ret;
+
+ dev_dbg(&client->dev, "Fault info: %02x\n", ret);
+
+ ret = as3645a_set_config(flash);
+ if (ret < 0)
+ return ret;
+
+ ret = as3645a_set_output(flash, false);
+ if (ret < 0)
+ return ret;
+
+ /* read status */
+ ret = as3645a_read_fault(flash);
+ if (ret < 0)
+ return ret;
+
+ dev_dbg(&client->dev, "AS_INDICATOR_AND_TIMER_REG: %02x\n",
+ as3645a_read(flash, AS_INDICATOR_AND_TIMER_REG));
+ dev_dbg(&client->dev, "AS_CURRENT_SET_REG: %02x\n",
+ as3645a_read(flash, AS_CURRENT_SET_REG));
+ dev_dbg(&client->dev, "AS_CONTROL_REG: %02x\n",
+ as3645a_read(flash, AS_CONTROL_REG));
+
+ return ret & ~AS_FAULT_INFO_LED_AMOUNT ? -EIO : 0;
+}
+
+static int __as3645a_set_power(struct as3645a *flash, int on)
+{
+ int ret;
+
+ if (!on)
+ as3645a_set_control(flash, AS_MODE_EXT_TORCH, false);
+
+ if (flash->platform_data && flash->platform_data->set_power) {
+ ret = flash->platform_data->set_power(&flash->subdev, on);
+ if (ret < 0)
+ return ret;
+ }
+
+ return on ? as3645a_setup(flash) : 0;
+}
+
+static int as3645a_set_power(struct v4l2_subdev *sd, int on)
+{
+ struct as3645a *flash = to_as3645a(sd);
+ int ret = 0;
+
+ mutex_lock(&flash->power_lock);
+
+ if (flash->power_count == !on) {
+ ret = __as3645a_set_power(flash, !!on);
+ if (ret < 0)
+ goto done;
+ }
+
+ flash->power_count += on ? 1 : -1;
+ WARN_ON(flash->power_count < 0);
+
+done:
+ mutex_unlock(&flash->power_lock);
+ return ret;
+}
+
+static int as3645a_registered(struct v4l2_subdev *sd)
+{
+ struct as3645a *flash = to_as3645a(sd);
+ struct i2c_client *client = v4l2_get_subdevdata(sd);
+ int rval, man, model, rfu, version;
+ const char *factory;
+
+ /* Power up the flash driver and read manufacturer ID, model ID, RFU
+ * and version.
+ */
+ as3645a_set_power(&flash->subdev, 1);
+
+ rval = as3645a_read(flash, AS_DESIGN_INFO_REG);
+ if (rval < 0)
+ goto power_off;
+
+ man = AS_DESIGN_INFO_FACTORY(rval);
+ model = AS_DESIGN_INFO_MODEL(rval);
+
+ rval = as3645a_read(flash, AS_VERSION_CONTROL_REG);
+ if (rval < 0)
+ goto power_off;
+
+ rfu = AS_VERSION_CONTROL_RFU(rval);
+ version = AS_VERSION_CONTROL_VERSION(rval);
+
+ if (model != 0x0001 || rfu != 0x0000) { /* Check for Senna */
+ dev_err(&client->dev, "Senna not detected (model:%d rfu:%d)\n",
+ model, rfu);
+ rval = -ENODEV;
+ goto power_off;
+ }
+
+ switch (man) {
+ case 1:
+ factory = "AMS, Austria Micro Systems";
+ break;
+ case 2:
+ factory = "ADI, Analog Devices Inc.";
+ break;
+ case 3:
+ factory = "NSC, National Semiconductor";
+ break;
+ case 4:
+ factory = "NXP";
+ break;
+ case 5:
+ factory = "TI, Texas Instrument";
+ break;
+ default:
+ factory = "Unknown";
+ }
+
+ dev_dbg(&client->dev, "Factory: %s(%d) Version: %d\n", factory, man,
+ version);
+
+ rval = as3645a_write(flash, AS_PASSWORD_REG, AS_PASSWORD_UNLOCK_VALUE);
+ if (rval < 0)
+ goto power_off;
+
+ rval = as3645a_write(flash, AS_BOOST_REG, AS_BOOST_CURRENT_DISABLE);
+ if (rval < 0)
+ goto power_off;
+
+ /* Setup default values. This makes sure that the chip is in a known
+ * state, in case the power rail can't be controlled.
+ */
+ rval = as3645a_setup(flash);
+
+power_off:
+ as3645a_set_power(&flash->subdev, 0);
+
+ return rval;
+}
+
+static int as3645a_subscribe_event(struct v4l2_subdev *subdev,
+ struct v4l2_fh *fh,
+ struct v4l2_event_subscription *sub)
+{
+ return v4l2_event_subscribe(fh, sub, AS3645A_FLASH_NEVENTS);
+}
+
+static int as3645a_unsubscribe_event(struct v4l2_subdev *subdev,
+ struct v4l2_fh *fh,
+ struct v4l2_event_subscription *sub)
+{
+ return v4l2_event_unsubscribe(fh, sub);
+}
+
+static int as3645a_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
+{
+ return as3645a_set_power(sd, 1);
+}
+
+static int as3645a_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
+{
+ return as3645a_set_power(sd, 0);
+}
+
+static const struct v4l2_subdev_core_ops as3645a_core_ops = {
+ .s_power = as3645a_set_power,
+ .subscribe_event = as3645a_subscribe_event,
+ .unsubscribe_event = as3645a_unsubscribe_event,
+};
+
+static const struct v4l2_subdev_ops as3645a_ops = {
+ .core = &as3645a_core_ops,
+};
+
+static const struct v4l2_subdev_internal_ops as3645a_internal_ops = {
+ .registered = as3645a_registered,
+ .open = as3645a_open,
+ .close = as3645a_close,
+};
+
+/* -----------------------------------------------------------------------------
+ * I2C driver
+ */
+#ifdef CONFIG_PM
+
+static int as3645a_suspend(struct i2c_client *client, pm_message_t mesg)
+{
+ struct v4l2_subdev *subdev = i2c_get_clientdata(client);
+ struct as3645a *flash = to_as3645a(subdev);
+ int rval;
+
+ if (flash->power_count == 0)
+ return 0;
+
+ rval = __as3645a_set_power(flash, 0);
+
+ dev_dbg(&client->dev, "Suspend %s\n", rval < 0 ? "failed" : "ok");
+
+ return rval;
+}
+
+static int as3645a_resume(struct i2c_client *client)
+{
+ struct v4l2_subdev *subdev = i2c_get_clientdata(client);
+ struct as3645a *flash = to_as3645a(subdev);
+ int rval;
+
+ if (flash->power_count == 0)
+ return 0;
+
+ rval = __as3645a_set_power(flash, 1);
+
+ dev_dbg(&client->dev, "Resume %s\n", rval < 0 ? "fail" : "ok");
+
+ return rval;
+}
+
+#else
+
+#define as3645a_suspend NULL
+#define as3645a_resume NULL
+
+#endif /* CONFIG_PM */
+
+/*
+ * as3645a_init_controls - Create controls
+ * @flash: The flash
+ *
+ * The number of LEDs reported in platform data is used to compute default
+ * limits. Parameters passed through platform data can override those limits.
+ */
+static int as3645a_init_controls(struct as3645a *flash)
+{
+ struct as3645a_flash_torch_parms *flash_params = NULL;
+ bool use_ext_strobe = false;
+ unsigned int leds = 2;
+ struct v4l2_ctrl *ctrl;
+ int minimum;
+ int maximum;
+
+ if (flash->platform_data) {
+ if (flash->platform_data->num_leds)
+ leds = flash->platform_data->num_leds;
+
+ flash_params = flash->platform_data->flash_torch_limits;
+ use_ext_strobe = flash->platform_data->use_ext_flash_strobe;
+ }
+
+ v4l2_ctrl_handler_init(&flash->ctrls, 11);
+
+ /* V4L2_CID_FLASH_LED_MODE */
+ v4l2_ctrl_new_std_menu(&flash->ctrls, &as3645a_ctrl_ops,
+ V4L2_CID_FLASH_LED_MODE, 2, ~7,
+ V4L2_FLASH_LED_MODE_NONE);
+
+ /* V4L2_CID_FLASH_STROBE_SOURCE */
+ v4l2_ctrl_new_std_menu(&flash->ctrls, &as3645a_ctrl_ops,
+ V4L2_CID_FLASH_STROBE_SOURCE,
+ use_ext_strobe ? 1 : 0, use_ext_strobe ? ~3 : ~1,
+ V4L2_FLASH_STROBE_SOURCE_SOFTWARE);
+
+ flash->strobe_source = V4L2_FLASH_STROBE_SOURCE_SOFTWARE;
+
+ /* V4L2_CID_FLASH_STROBE */
+ v4l2_ctrl_new_std(&flash->ctrls, &as3645a_ctrl_ops,
+ V4L2_CID_FLASH_STROBE, 0, 0, 0, 0);
+
+ /* V4L2_CID_FLASH_STROBE_STOP */
+ v4l2_ctrl_new_std(&flash->ctrls, &as3645a_ctrl_ops,
+ V4L2_CID_FLASH_STROBE_STOP, 0, 0, 0, 0);
+
+ /* V4L2_CID_FLASH_STROBE_STATUS */
+ ctrl = v4l2_ctrl_new_std(&flash->ctrls, &as3645a_ctrl_ops,
+ V4L2_CID_FLASH_STROBE_STATUS, 0, 1, 1, 1);
+ if (ctrl != NULL)
+ ctrl->is_volatile = 1;
+
+ /* V4L2_CID_FLASH_TIMEOUT */
+ if (flash_params) {
+ minimum = flash_params->timeout_min;
+ maximum = flash_params->timeout_max;
+ } else {
+ minimum = 1;
+ maximum = AS3645A_FLASH_TIMEOUT_MAX;
+ }
+
+ v4l2_ctrl_new_std(&flash->ctrls, &as3645a_ctrl_ops,
+ V4L2_CID_FLASH_TIMEOUT, minimum, maximum,
+ 1, maximum);
+
+ flash->timeout = maximum;
+
+ /* V4L2_CID_FLASH_INTENSITY */
+ if (flash_params) {
+ minimum = flash_params->flash_min_current;
+ maximum = flash_params->flash_max_current;
+ } else {
+ minimum = AS3645A_FLASH_INTENSITY_MIN;
+ maximum = leds == 1 ? AS3645A_FLASH_INTENSITY_MAX_1LED
+ : AS3645A_FLASH_INTENSITY_MAX_2LEDS;
+ }
+
+ v4l2_ctrl_new_std(&flash->ctrls, &as3645a_ctrl_ops,
+ V4L2_CID_FLASH_INTENSITY, minimum, maximum,
+ AS3645A_FLASH_INTENSITY_STEP, maximum);
+
+ flash->flash_current = (maximum - AS3645A_FLASH_INTENSITY_MIN)
+ / AS3645A_FLASH_INTENSITY_STEP;
+
+ /* V4L2_CID_FLASH_TORCH_INTENSITY */
+ if (flash_params) {
+ minimum = flash_params->torch_min_current;
+ maximum = flash_params->torch_max_current;
+ } else {
+ minimum = AS3645A_TORCH_INTENSITY_MIN;
+ maximum = AS3645A_TORCH_INTENSITY_MAX;
+ }
+
+ v4l2_ctrl_new_std(&flash->ctrls, &as3645a_ctrl_ops,
+ V4L2_CID_FLASH_TORCH_INTENSITY, minimum, maximum,
+ AS3645A_TORCH_INTENSITY_STEP, minimum);
+
+ flash->assist_current = (minimum - AS3645A_TORCH_INTENSITY_MIN)
+ / AS3645A_TORCH_INTENSITY_STEP;
+
+ /* V4L2_CID_FLASH_INDICATOR_INTENSITY */
+ v4l2_ctrl_new_std(&flash->ctrls, &as3645a_ctrl_ops,
+ V4L2_CID_FLASH_INDICATOR_INTENSITY,
+ AS3645A_INDICATOR_INTENSITY_MIN,
+ AS3645A_INDICATOR_INTENSITY_MAX,
+ AS3645A_INDICATOR_INTENSITY_STEP,
+ AS3645A_INDICATOR_INTENSITY_MIN);
+
+ flash->indicator_current = 0;
+
+ /* V4L2_CID_FLASH_FAULT */
+ ctrl = v4l2_ctrl_new_std(&flash->ctrls, &as3645a_ctrl_ops,
+ V4L2_CID_FLASH_FAULT, 0,
+ V4L2_FLASH_FAULT_OVER_VOLTAGE |
+ V4L2_FLASH_FAULT_TIMEOUT |
+ V4L2_FLASH_FAULT_OVER_TEMPERATURE |
+ V4L2_FLASH_FAULT_SHORT_CIRCUIT, 0, 0);
+ if (ctrl != NULL)
+ ctrl->is_volatile = 1;
+
+ /* V4L2_CID_FLASH_READY */
+ ctrl = v4l2_ctrl_new_std(&flash->ctrls, &as3645a_ctrl_ops,
+ V4L2_CID_FLASH_READY, 0, 1, 1, 1);
+ if (ctrl != NULL)
+ ctrl->is_volatile = 1;
+
+ flash->subdev.ctrl_handler = &flash->ctrls;
+
+ return flash->ctrls.error;
+}
+
+static int as3645a_probe(struct i2c_client *client,
+ const struct i2c_device_id *devid)
+{
+ struct as3645a *flash;
+ int ret;
+
+ flash = kzalloc(sizeof(*flash), GFP_KERNEL);
+ if (flash == NULL)
+ return -ENOMEM;
+
+ flash->platform_data = client->dev.platform_data;
+
+ v4l2_i2c_subdev_init(&flash->subdev, client, &as3645a_ops);
+ flash->subdev.internal_ops = &as3645a_internal_ops;
+ flash->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE |
+ V4L2_SUBDEV_FL_HAS_EVENTS;
+
+ ret = media_entity_init(&flash->subdev.entity, 0, NULL, 0);
+ if (ret < 0) {
+ kfree(flash);
+ return ret;
+ }
+
+ mutex_init(&flash->power_lock);
+
+ init_timer(&flash->timer);
+ flash->timer.function = as3645_state_timer_func;
+ flash->timer.data = (unsigned long)flash;
+ spin_lock_init(&flash->state_lock);
+
+ /* FIXME: These are hard coded for now */
+ flash->vref = 0; /* 0V */
+ flash->peak = 2; /* 1.75A */
+
+ flash->led_mode = V4L2_FLASH_LED_MODE_NONE;
+ flash->mode = AS_MODE_EXT_TORCH;
+ flash->active = false;
+ flash->torch_on_time = 0;
+ flash->flash_count = 0;
+ flash->flash_on_time = 0;
+ flash->flash_off_time = 0;
+ flash->state = AS_STATE_READY;
+
+ ret = as3645a_init_controls(flash);
+ if (ret < 0) {
+ kfree(flash);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int __exit as3645a_remove(struct i2c_client *client)
+{
+ struct v4l2_subdev *subdev = i2c_get_clientdata(client);
+ struct as3645a *flash = to_as3645a(subdev);
+
+ v4l2_device_unregister_subdev(subdev);
+ v4l2_ctrl_handler_free(&flash->ctrls);
+
+ kfree(flash);
+
+ return 0;
+}
+
+static const struct i2c_device_id as3645a_id_table[] = {
+ { AS3645A_NAME, 0 },
+ { },
+};
+MODULE_DEVICE_TABLE(i2c, as3645a_id_table);
+
+static struct i2c_driver as3645a_i2c_driver = {
+ .driver = {
+ .name = AS3645A_NAME,
+ },
+ .probe = as3645a_probe,
+ .remove = __exit_p(as3645a_remove),
+ .suspend = as3645a_suspend,
+ .resume = as3645a_resume,
+ .id_table = as3645a_id_table,
+};
+
+static int __init as3645a_init(void)
+{
+ int rval;
+
+ rval = i2c_add_driver(&as3645a_i2c_driver);
+ if (rval)
+ printk(KERN_ERR "Failed registering driver" AS3645A_NAME"\n");
+
+ return rval;
+}
+
+static void __exit as3645a_exit(void)
+{
+ i2c_del_driver(&as3645a_i2c_driver);
+}
+
+module_init(as3645a_init);
+module_exit(as3645a_exit);
+
+MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("AS3645A Flash driver");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/as3645a.h b/include/linux/as3645a.h
new file mode 100644
index 0000000..a9678ad
--- /dev/null
+++ b/include/linux/as3645a.h
@@ -0,0 +1,36 @@
+/**
+ * include/linux/as3645a.h
+ *
+ * Copyright (C) 2008-2011 Nokia Corporation
+ *
+ * Contact: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#ifndef __AS3645A_USER_H_
+#define __AS3645A_USER_H_
+
+#include <linux/videodev2.h>
+
+#define V4L2_EVENT_AS3645A_CLASS (V4L2_EVENT_PRIVATE_START | 0x200)
+#define V4L2_EVENT_STATUS_CHANGED (V4L2_EVENT_AS3645A_CLASS | 1)
+
+enum v4l2_flash_events {
+ V4L2_FLASH_READY = 0,
+ V4L2_FLASH_COOLDOWN = 1,
+};
+
+#endif /* __AS3645A_USER_H_ */
diff --git a/include/media/as3645a.h b/include/media/as3645a.h
new file mode 100644
index 0000000..12bedb4
--- /dev/null
+++ b/include/media/as3645a.h
@@ -0,0 +1,69 @@
+/*
+ * include/media/as3645a.h
+ *
+ * Copyright (C) 2008-2011 Nokia Corporation
+ *
+ * Contact: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+
+#ifndef __AS3645A_H__
+#define __AS3645A_H__
+
+#include <media/v4l2-subdev.h>
+
+#define AS3645A_NAME "as3645a"
+#define AS3645A_I2C_ADDR (0x60 >> 1) /* W:0x60, R:0x61 */
+
+/*
+ * as3645a_flash_torch_parms - Flash and torch currents and timeout limits
+ * @flash_min_current: Min flash current (mA)
+ * @flash_max_current: Max flash current (mA)
+ * @torch_min_current: Min torch current (mA)
+ * @torch_max_current: Max torch current (mA)
+ * @timeout_min: Min flash timeout (us)
+ * @timeout_max: Max flash timeout (us)
+ */
+struct as3645a_flash_torch_parms {
+ unsigned int flash_min_current;
+ unsigned int flash_max_current;
+ unsigned int torch_min_current;
+ unsigned int torch_max_current;
+ unsigned int timeout_min;
+ unsigned int timeout_max;
+};
+
+struct as3645a_platform_data {
+ int (*set_power)(struct v4l2_subdev *subdev, int on);
+ /* used to notify the entity which trigger external storbe signal */
+ void (*setup_ext_strobe)(int enable);
+ /* Sends the strobe width to the sensor strobe configuration */
+ void (*set_strobe_width)(u32 width_in_us);
+ /* positive value if Torch pin is used */
+ int ext_torch;
+ /* positive value if Flash Strobe pin is used for triggering
+ * the Flash light (no matter where is connected to, host processor or
+ * image sensor)
+ */
+ int use_ext_flash_strobe;
+ /* Number of attached LEDs, 1 or 2 */
+ int num_leds;
+ /* LED limitations with this flash chip */
+ struct as3645a_flash_torch_parms *flash_torch_limits;
+};
+
+#endif /* __AS3645A_H__ */
--
1.7.3.4
--
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