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 | 951 +++++++++++++++++++++++++++++++++++++++++
include/media/as3645a.h | 69 +++
4 files changed, 1028 insertions(+), 0 deletions(-)
create mode 100644 drivers/media/video/as3645a.c
create mode 100644 include/media/as3645a.h
diff --git a/drivers/media/video/Kconfig b/drivers/media/video/Kconfig
index 4e8a0c4..ba27f89 100644
--- a/drivers/media/video/Kconfig
+++ b/drivers/media/video/Kconfig
@@ -533,6 +533,13 @@ 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 ddeaa6c..86aabd6 100644
--- a/drivers/media/video/Makefile
+++ b/drivers/media/video/Makefile
@@ -74,6 +74,7 @@ obj-$(CONFIG_VIDEO_NOON010PC30) += noon010pc30.o
obj-$(CONFIG_VIDEO_M5MOLS) += m5mols/
obj-$(CONFIG_VIDEO_S5K6AA) += s5k6aa.o
obj-$(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..4138eb7
--- /dev/null
+++ b/drivers/media/video/as3645a.c
@@ -0,0 +1,951 @@
+/*
+ * 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/delay.h>
+#include <linux/i2c.h>
+#include <linux/mutex.h>
+
+#include <media/as3645a.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-device.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 */
+#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,
+};
+
+/*
+ * 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)
+ */
+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;
+};
+
+#define to_as3645a(sd) container_of(sd, struct as3645a, subdev)
+
+/* 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;
+}
+
+/* -----------------------------------------------------------------------------
+ * 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)
+{
+ 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;
+ }
+
+ /* Configure output parameters and operation mode. */
+ ret = as3645a_set_control(flash, mode, on);
+ if (ret < 0)
+ return ret;
+
+ 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, "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;
+
+ 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);
+
+ /* Verify the chip model and version. */
+ if (model != 0x0001 || rfu != 0x0000) {
+ dev_err(&client->dev, "AS3645A 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_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,
+};
+
+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, 9);
+
+ /* 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_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->flags |= V4L2_CTRL_FLAG_VOLATILE;
+
+ 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;
+
+ ret = media_entity_init(&flash->subdev.entity, 0, NULL, 0);
+ if (ret < 0) {
+ kfree(flash);
+ return ret;
+ }
+
+ mutex_init(&flash->power_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;
+
+ 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/media/as3645a.h b/include/media/as3645a.h
new file mode 100644
index 0000000..1556a97
--- /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 strobe 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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