From 22db44cb9cd67d56b02b2b5dceb10d3d1361b28b Mon Sep 17 00:00:00 2001 From: Laurent Pinchart Date: Thu, 5 May 2011 15:39:25 -0300 Subject: [PATCH] [media] as3645a: Add driver for LED flash controller 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 Signed-off-by: Andy Shevchenko Signed-off-by: Nayden Kanchev Signed-off-by: Tuukka Toivonen Signed-off-by: Antti Koskipaa Signed-off-by: Stanimir Varbanov Signed-off-by: Vimarsh Zutshi Signed-off-by: Sakari Ailus Signed-off-by: Ivan T. Ivanov Signed-off-by: Mika Westerberg Signed-off-by: David Cohen Signed-off-by: Mauro Carvalho Chehab --- drivers/media/video/Kconfig | 7 + drivers/media/video/Makefile | 1 + drivers/media/video/as3645a.c | 904 ++++++++++++++++++++++++++++++++++ include/media/as3645a.h | 71 +++ 4 files changed, 983 insertions(+) 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 4e8a0c4bc000..0e4d241fc6e6 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 and LM3555 flash controllers. 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 ddeaa6c8ad9a..86aabd64383e 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 000000000000..ec859a580651 --- /dev/null +++ b/drivers/media/video/as3645a.c @@ -0,0 +1,904 @@ +/* + * drivers/media/video/as3645a.c - AS3645A and LM3555 flash controllers driver + * + * Copyright (C) 2008-2011 Nokia Corporation + * Copyright (c) 2011, Intel Corporation. + * + * Contact: Laurent Pinchart + * + * 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 + * + * TODO: + * - Check hardware FSTROBE control when sensor driver add support for this + * + */ + +#include +#include +#include +#include + +#include +#include +#include + +#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 + +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 + * @pdata: Flash platform data + * @power_lock: Protects power_count + * @power_count: Power reference count + * @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; + const struct as3645a_platform_data *pdata; + + struct mutex power_lock; + int power_count; + + /* 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; + + val = AS_TIMER_MS_TO_CODE(flash->timeout / 1000) + << AS_INDICATOR_AND_TIMER_TIMEOUT_SHIFT; + + val |= (flash->pdata->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->pdata->peak << AS_CONTROL_COIL_PEAK_SHIFT) + | (on ? AS_CONTROL_OUT_ON : 0) + | mode; + + if (flash->led_mode == V4L2_FLASH_LED_MODE_FLASH && + flash->strobe_source == V4L2_FLASH_STROBE_SOURCE_EXTERNAL) { + 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; + + 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: + BUG(); + } + + /* Configure output parameters and operation mode. */ + return as3645a_set_control(flash, mode, on); +} + +/* ----------------------------------------------------------------------------- + * V4L2 controls + */ + +static int as3645a_is_active(struct as3645a *flash) +{ + int ret; + + ret = as3645a_read(flash, AS_CONTROL_REG); + return ret < 0 ? ret : !!(ret & AS_CONTROL_OUT_ON); +} + +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_dbg(&client->dev, "Inductor Peak limit fault\n"); + + if (rval & AS_FAULT_INFO_INDICATOR_LED) + dev_dbg(&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_dbg(&client->dev, "Timeout fault\n"); + + if (rval & AS_FAULT_INFO_OVER_TEMPERATURE) + dev_dbg(&client->dev, "Over temperature fault\n"); + + if (rval & AS_FAULT_INFO_SHORT_CIRCUIT) + dev_dbg(&client->dev, "Short circuit fault\n"); + + if (rval & AS_FAULT_INFO_OVER_VOLTAGE) + dev_dbg(&client->dev, "Over voltage fault: " + "Indicates missing capacitor or open connection\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 value; + + switch (ctrl->id) { + case V4L2_CID_FLASH_FAULT: + value = as3645a_read_fault(flash); + if (value < 0) + return value; + + ctrl->cur.val = 0; + if (value & AS_FAULT_INFO_SHORT_CIRCUIT) + ctrl->cur.val |= V4L2_FLASH_FAULT_SHORT_CIRCUIT; + if (value & AS_FAULT_INFO_OVER_TEMPERATURE) + ctrl->cur.val |= V4L2_FLASH_FAULT_OVER_TEMPERATURE; + if (value & AS_FAULT_INFO_TIMEOUT) + ctrl->cur.val |= V4L2_FLASH_FAULT_TIMEOUT; + if (value & AS_FAULT_INFO_OVER_VOLTAGE) + ctrl->cur.val |= V4L2_FLASH_FAULT_OVER_VOLTAGE; + if (value & AS_FAULT_INFO_INDUCTOR_PEAK_LIMIT) + ctrl->cur.val |= V4L2_FLASH_FAULT_OVER_CURRENT; + if (value & AS_FAULT_INFO_INDICATOR_LED) + ctrl->cur.val |= V4L2_FLASH_FAULT_INDICATOR; + break; + + case V4L2_CID_FLASH_STROBE_STATUS: + if (flash->led_mode != V4L2_FLASH_LED_MODE_FLASH) { + ctrl->cur.val = 0; + break; + } + + value = as3645a_is_active(flash); + if (value < 0) + return value; + + ctrl->cur.val = value; + break; + } + + 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: + 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); + } + + 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->pdata->set_power) { + ret = flash->pdata->set_power(&flash->subdev, on); + if (ret < 0) + return ret; + } + + if (!on) + return 0; + + ret = as3645a_setup(flash); + if (ret < 0) { + if (flash->pdata->set_power) + flash->pdata->set_power(&flash->subdev, 0); + } + + return ret; +} + +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 *vendor; + + /* Power up the flash driver and read manufacturer ID, model ID, RFU + * and version. + */ + rval = as3645a_set_power(&flash->subdev, 1); + if (rval < 0) + return rval; + + 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 != 0x01 || rfu != 0x00) { + dev_err(&client->dev, "AS3645A not detected " + "(model %d rfu %d)\n", model, rfu); + rval = -ENODEV; + goto power_off; + } + + switch (man) { + case 1: + vendor = "AMS, Austria Micro Systems"; + break; + case 2: + vendor = "ADI, Analog Devices Inc."; + break; + case 3: + vendor = "NSC, National Semiconductor"; + break; + case 4: + vendor = "NXP"; + break; + case 5: + vendor = "TI, Texas Instrument"; + break; + default: + vendor = "Unknown"; + } + + dev_info(&client->dev, "Chip vendor: %s (%d) Version: %d\n", vendor, + 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 device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + 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 device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + 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) +{ + const struct as3645a_platform_data *pdata = flash->pdata; + struct v4l2_ctrl *ctrl; + int maximum; + + v4l2_ctrl_handler_init(&flash->ctrls, 10); + + /* 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, + pdata->ext_strobe ? 1 : 0, + pdata->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->flags |= V4L2_CTRL_FLAG_VOLATILE; + + /* V4L2_CID_FLASH_TIMEOUT */ + maximum = pdata->timeout_max; + + v4l2_ctrl_new_std(&flash->ctrls, &as3645a_ctrl_ops, + V4L2_CID_FLASH_TIMEOUT, AS3645A_FLASH_TIMEOUT_MIN, + maximum, AS3645A_FLASH_TIMEOUT_STEP, maximum); + + flash->timeout = maximum; + + /* V4L2_CID_FLASH_INTENSITY */ + maximum = pdata->flash_max_current; + + v4l2_ctrl_new_std(&flash->ctrls, &as3645a_ctrl_ops, + V4L2_CID_FLASH_INTENSITY, AS3645A_FLASH_INTENSITY_MIN, + maximum, AS3645A_FLASH_INTENSITY_STEP, maximum); + + flash->flash_current = (maximum - AS3645A_FLASH_INTENSITY_MIN) + / AS3645A_FLASH_INTENSITY_STEP; + + /* V4L2_CID_FLASH_TORCH_INTENSITY */ + maximum = pdata->torch_max_current; + + v4l2_ctrl_new_std(&flash->ctrls, &as3645a_ctrl_ops, + V4L2_CID_FLASH_TORCH_INTENSITY, + AS3645A_TORCH_INTENSITY_MIN, maximum, + AS3645A_TORCH_INTENSITY_STEP, + AS3645A_TORCH_INTENSITY_MIN); + + flash->assist_current = 0; + + /* 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; + + if (client->dev.platform_data == NULL) + return -ENODEV; + + flash = kzalloc(sizeof(*flash), GFP_KERNEL); + if (flash == NULL) + return -ENOMEM; + + flash->pdata = 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 = as3645a_init_controls(flash); + if (ret < 0) + goto done; + + ret = media_entity_init(&flash->subdev.entity, 0, NULL, 0); + if (ret < 0) + goto done; + + flash->subdev.entity.type = MEDIA_ENT_T_V4L2_SUBDEV_FLASH; + + mutex_init(&flash->power_lock); + + flash->led_mode = V4L2_FLASH_LED_MODE_NONE; + +done: + if (ret < 0) { + v4l2_ctrl_handler_free(&flash->ctrls); + kfree(flash); + } + + return ret; +} + +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); + media_entity_cleanup(&flash->subdev.entity); + mutex_destroy(&flash->power_lock); + kfree(flash); + + return 0; +} + +static const struct i2c_device_id as3645a_id_table[] = { + { AS3645A_NAME, 0 }, + { }, +}; +MODULE_DEVICE_TABLE(i2c, as3645a_id_table); + +static const struct dev_pm_ops as3645a_pm_ops = { + .suspend = as3645a_suspend, + .resume = as3645a_resume, +}; + +static struct i2c_driver as3645a_i2c_driver = { + .driver = { + .name = AS3645A_NAME, + .pm = &as3645a_pm_ops, + }, + .probe = as3645a_probe, + .remove = __exit_p(as3645a_remove), + .id_table = as3645a_id_table, +}; + +static int __init as3645a_init(void) +{ + int rval; + + rval = i2c_add_driver(&as3645a_i2c_driver); + if (rval) + pr_err("%s: Failed to register the driver\n", AS3645A_NAME); + + 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 "); +MODULE_DESCRIPTION("LED flash driver for AS3645A, LM3555 and their clones"); +MODULE_LICENSE("GPL"); diff --git a/include/media/as3645a.h b/include/media/as3645a.h new file mode 100644 index 000000000000..5075496d2c9e --- /dev/null +++ b/include/media/as3645a.h @@ -0,0 +1,71 @@ +/* + * include/media/as3645a.h + * + * Copyright (C) 2008-2011 Nokia Corporation + * + * Contact: Laurent Pinchart + * + * 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 + +#define AS3645A_NAME "as3645a" +#define AS3645A_I2C_ADDR (0x60 >> 1) /* W:0x60, R:0x61 */ + +#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 + +/* + * as3645a_platform_data - Flash controller platform data + * @set_power: Set power callback + * @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) + * @ext_strobe: True if external flash strobe can be used + * @flash_max_current: Max flash current (mA, <= AS3645A_FLASH_INTENSITY_MAX) + * @torch_max_current: Max torch current (mA, >= AS3645A_TORCH_INTENSITY_MAX) + * @timeout_max: Max flash timeout (us, <= AS3645A_FLASH_TIMEOUT_MAX) + */ +struct as3645a_platform_data { + int (*set_power)(struct v4l2_subdev *subdev, int on); + unsigned int vref; + unsigned int peak; + bool ext_strobe; + + /* Flash and torch currents and timeout limits */ + unsigned int flash_max_current; + unsigned int torch_max_current; + unsigned int timeout_max; +}; + +#endif /* __AS3645A_H__ */ -- 2.20.1