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[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 <laurent.pinchart@ideasonboard.com> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Nayden Kanchev <nkanchev@mm-sol.com> Signed-off-by: Tuukka Toivonen <tuukkat76@gmail.com> Signed-off-by: Antti Koskipaa <antti.koskipaa@gmail.com> Signed-off-by: Stanimir Varbanov <svarbanov@mm-sol.com> Signed-off-by: Vimarsh Zutshi <vimarsh.zutshi@gmail.com> Signed-off-by: Sakari Ailus <sakari.ailus@iki.fi> Signed-off-by: Ivan T. Ivanov <iivanov@mm-sol.com> Signed-off-by: Mika Westerberg <ext-mika.1.westerberg@nokia.com> Signed-off-by: David Cohen <dacohen@gmail.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Laurent Pinchart
Mauro Carvalho Chehab
parent
a597fa78d3
commit
22db44cb9c
@ -533,6 +533,13 @@ config VIDEO_ADP1653
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This is a driver for the ADP1653 flash controller. It is used for
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example in Nokia N900.
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config VIDEO_AS3645A
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tristate "AS3645A flash driver support"
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depends on I2C && VIDEO_V4L2 && MEDIA_CONTROLLER
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---help---
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This is a driver for the AS3645A and LM3555 flash controllers. It has
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build in control for flash, torch and indicator LEDs.
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comment "Video improvement chips"
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config VIDEO_UPD64031A
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@ -74,6 +74,7 @@ obj-$(CONFIG_VIDEO_NOON010PC30) += noon010pc30.o
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obj-$(CONFIG_VIDEO_M5MOLS) += m5mols/
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obj-$(CONFIG_VIDEO_S5K6AA) += s5k6aa.o
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obj-$(CONFIG_VIDEO_ADP1653) += adp1653.o
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obj-$(CONFIG_VIDEO_AS3645A) += as3645a.o
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obj-$(CONFIG_SOC_CAMERA_IMX074) += imx074.o
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obj-$(CONFIG_SOC_CAMERA_MT9M001) += mt9m001.o
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904
drivers/media/video/as3645a.c
Normal file
904
drivers/media/video/as3645a.c
Normal file
@ -0,0 +1,904 @@
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/*
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* drivers/media/video/as3645a.c - AS3645A and LM3555 flash controllers driver
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*
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* Copyright (C) 2008-2011 Nokia Corporation
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* Copyright (c) 2011, Intel Corporation.
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*
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* Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*
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* TODO:
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* - Check hardware FSTROBE control when sensor driver add support for this
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*
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*/
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#include <linux/delay.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <media/as3645a.h>
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#include <media/v4l2-ctrls.h>
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#include <media/v4l2-device.h>
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#define AS_TIMER_MS_TO_CODE(t) (((t) - 100) / 50)
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#define AS_TIMER_CODE_TO_MS(c) (50 * (c) + 100)
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/* Register definitions */
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/* Read-only Design info register: Reset state: xxxx 0001 */
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#define AS_DESIGN_INFO_REG 0x00
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#define AS_DESIGN_INFO_FACTORY(x) (((x) >> 4))
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#define AS_DESIGN_INFO_MODEL(x) ((x) & 0x0f)
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/* Read-only Version control register: Reset state: 0000 0000
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* for first engineering samples
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*/
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#define AS_VERSION_CONTROL_REG 0x01
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#define AS_VERSION_CONTROL_RFU(x) (((x) >> 4))
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#define AS_VERSION_CONTROL_VERSION(x) ((x) & 0x0f)
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/* Read / Write (Indicator and timer register): Reset state: 0000 1111 */
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#define AS_INDICATOR_AND_TIMER_REG 0x02
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#define AS_INDICATOR_AND_TIMER_TIMEOUT_SHIFT 0
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#define AS_INDICATOR_AND_TIMER_VREF_SHIFT 4
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#define AS_INDICATOR_AND_TIMER_INDICATOR_SHIFT 6
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/* Read / Write (Current set register): Reset state: 0110 1001 */
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#define AS_CURRENT_SET_REG 0x03
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#define AS_CURRENT_ASSIST_LIGHT_SHIFT 0
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#define AS_CURRENT_LED_DET_ON (1 << 3)
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#define AS_CURRENT_FLASH_CURRENT_SHIFT 4
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/* Read / Write (Control register): Reset state: 1011 0100 */
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#define AS_CONTROL_REG 0x04
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#define AS_CONTROL_MODE_SETTING_SHIFT 0
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#define AS_CONTROL_STROBE_ON (1 << 2)
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#define AS_CONTROL_OUT_ON (1 << 3)
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#define AS_CONTROL_EXT_TORCH_ON (1 << 4)
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#define AS_CONTROL_STROBE_TYPE_EDGE (0 << 5)
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#define AS_CONTROL_STROBE_TYPE_LEVEL (1 << 5)
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#define AS_CONTROL_COIL_PEAK_SHIFT 6
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/* Read only (D3 is read / write) (Fault and info): Reset state: 0000 x000 */
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#define AS_FAULT_INFO_REG 0x05
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#define AS_FAULT_INFO_INDUCTOR_PEAK_LIMIT (1 << 1)
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#define AS_FAULT_INFO_INDICATOR_LED (1 << 2)
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#define AS_FAULT_INFO_LED_AMOUNT (1 << 3)
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#define AS_FAULT_INFO_TIMEOUT (1 << 4)
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#define AS_FAULT_INFO_OVER_TEMPERATURE (1 << 5)
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#define AS_FAULT_INFO_SHORT_CIRCUIT (1 << 6)
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#define AS_FAULT_INFO_OVER_VOLTAGE (1 << 7)
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/* Boost register */
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#define AS_BOOST_REG 0x0d
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#define AS_BOOST_CURRENT_DISABLE (0 << 0)
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#define AS_BOOST_CURRENT_ENABLE (1 << 0)
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/* Password register is used to unlock boost register writing */
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#define AS_PASSWORD_REG 0x0f
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#define AS_PASSWORD_UNLOCK_VALUE 0x55
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enum as_mode {
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AS_MODE_EXT_TORCH = 0 << AS_CONTROL_MODE_SETTING_SHIFT,
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AS_MODE_INDICATOR = 1 << AS_CONTROL_MODE_SETTING_SHIFT,
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AS_MODE_ASSIST = 2 << AS_CONTROL_MODE_SETTING_SHIFT,
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AS_MODE_FLASH = 3 << AS_CONTROL_MODE_SETTING_SHIFT,
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};
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/*
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* struct as3645a
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*
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* @subdev: V4L2 subdev
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* @pdata: Flash platform data
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* @power_lock: Protects power_count
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* @power_count: Power reference count
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* @led_mode: V4L2 flash LED mode
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* @timeout: Flash timeout in microseconds
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* @flash_current: Flash current (0=200mA ... 15=500mA). Maximum
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* values are 400mA for two LEDs and 500mA for one LED.
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* @assist_current: Torch/Assist light current (0=20mA, 1=40mA ... 7=160mA)
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* @indicator_current: Indicator LED current (0=0mA, 1=2.5mA ... 4=10mA)
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* @strobe_source: Flash strobe source (software or external)
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*/
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struct as3645a {
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struct v4l2_subdev subdev;
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const struct as3645a_platform_data *pdata;
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struct mutex power_lock;
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int power_count;
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/* Controls */
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struct v4l2_ctrl_handler ctrls;
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enum v4l2_flash_led_mode led_mode;
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unsigned int timeout;
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u8 flash_current;
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u8 assist_current;
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u8 indicator_current;
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enum v4l2_flash_strobe_source strobe_source;
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};
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#define to_as3645a(sd) container_of(sd, struct as3645a, subdev)
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/* Return negative errno else zero on success */
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static int as3645a_write(struct as3645a *flash, u8 addr, u8 val)
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{
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struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev);
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int rval;
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rval = i2c_smbus_write_byte_data(client, addr, val);
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dev_dbg(&client->dev, "Write Addr:%02X Val:%02X %s\n", addr, val,
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rval < 0 ? "fail" : "ok");
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return rval;
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}
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/* Return negative errno else a data byte received from the device. */
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static int as3645a_read(struct as3645a *flash, u8 addr)
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{
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struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev);
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int rval;
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rval = i2c_smbus_read_byte_data(client, addr);
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dev_dbg(&client->dev, "Read Addr:%02X Val:%02X %s\n", addr, rval,
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rval < 0 ? "fail" : "ok");
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return rval;
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}
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/* -----------------------------------------------------------------------------
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* Hardware configuration and trigger
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*/
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/*
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* as3645a_set_config - Set flash configuration registers
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* @flash: The flash
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*
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* Configure the hardware with flash, assist and indicator currents, as well as
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* flash timeout.
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*
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* Return 0 on success, or a negative error code if an I2C communication error
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* occurred.
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*/
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static int as3645a_set_config(struct as3645a *flash)
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{
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int ret;
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u8 val;
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val = (flash->flash_current << AS_CURRENT_FLASH_CURRENT_SHIFT)
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| (flash->assist_current << AS_CURRENT_ASSIST_LIGHT_SHIFT)
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| AS_CURRENT_LED_DET_ON;
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ret = as3645a_write(flash, AS_CURRENT_SET_REG, val);
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if (ret < 0)
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return ret;
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val = AS_TIMER_MS_TO_CODE(flash->timeout / 1000)
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<< AS_INDICATOR_AND_TIMER_TIMEOUT_SHIFT;
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val |= (flash->pdata->vref << AS_INDICATOR_AND_TIMER_VREF_SHIFT)
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| ((flash->indicator_current ? flash->indicator_current - 1 : 0)
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<< AS_INDICATOR_AND_TIMER_INDICATOR_SHIFT);
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return as3645a_write(flash, AS_INDICATOR_AND_TIMER_REG, val);
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}
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/*
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* as3645a_set_control - Set flash control register
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* @flash: The flash
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* @mode: Desired output mode
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* @on: Desired output state
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*
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* Configure the hardware with output mode and state.
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*
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* Return 0 on success, or a negative error code if an I2C communication error
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* occurred.
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*/
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static int
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as3645a_set_control(struct as3645a *flash, enum as_mode mode, bool on)
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{
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u8 reg;
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/* Configure output parameters and operation mode. */
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reg = (flash->pdata->peak << AS_CONTROL_COIL_PEAK_SHIFT)
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| (on ? AS_CONTROL_OUT_ON : 0)
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| mode;
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if (flash->led_mode == V4L2_FLASH_LED_MODE_FLASH &&
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flash->strobe_source == V4L2_FLASH_STROBE_SOURCE_EXTERNAL) {
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reg |= AS_CONTROL_STROBE_TYPE_LEVEL
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| AS_CONTROL_STROBE_ON;
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}
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return as3645a_write(flash, AS_CONTROL_REG, reg);
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}
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/*
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* as3645a_set_output - Configure output and operation mode
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* @flash: Flash controller
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* @strobe: Strobe the flash (only valid in flash mode)
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*
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* Turn the LEDs output on/off and set the operation mode based on the current
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* parameters.
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*
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* The AS3645A can't control the indicator LED independently of the flash/torch
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* LED. If the flash controller is in V4L2_FLASH_LED_MODE_NONE mode, set the
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* chip to indicator mode. Otherwise set it to assist light (torch) or flash
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* mode.
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*
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* In indicator and assist modes, turn the output on/off based on the indicator
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* and torch currents. In software strobe flash mode, turn the output on/off
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* based on the strobe parameter.
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*/
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static int as3645a_set_output(struct as3645a *flash, bool strobe)
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{
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enum as_mode mode;
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bool on;
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switch (flash->led_mode) {
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case V4L2_FLASH_LED_MODE_NONE:
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on = flash->indicator_current != 0;
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mode = AS_MODE_INDICATOR;
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break;
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case V4L2_FLASH_LED_MODE_TORCH:
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on = true;
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mode = AS_MODE_ASSIST;
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break;
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case V4L2_FLASH_LED_MODE_FLASH:
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on = strobe;
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mode = AS_MODE_FLASH;
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break;
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default:
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BUG();
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}
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/* Configure output parameters and operation mode. */
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return as3645a_set_control(flash, mode, on);
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}
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/* -----------------------------------------------------------------------------
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* V4L2 controls
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*/
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static int as3645a_is_active(struct as3645a *flash)
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{
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int ret;
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ret = as3645a_read(flash, AS_CONTROL_REG);
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return ret < 0 ? ret : !!(ret & AS_CONTROL_OUT_ON);
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}
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static int as3645a_read_fault(struct as3645a *flash)
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{
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struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev);
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int rval;
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/* NOTE: reading register clear fault status */
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rval = as3645a_read(flash, AS_FAULT_INFO_REG);
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if (rval < 0)
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return rval;
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if (rval & AS_FAULT_INFO_INDUCTOR_PEAK_LIMIT)
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dev_dbg(&client->dev, "Inductor Peak limit fault\n");
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if (rval & AS_FAULT_INFO_INDICATOR_LED)
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dev_dbg(&client->dev, "Indicator LED fault: "
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"Short circuit or open loop\n");
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dev_dbg(&client->dev, "%u connected LEDs\n",
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rval & AS_FAULT_INFO_LED_AMOUNT ? 2 : 1);
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if (rval & AS_FAULT_INFO_TIMEOUT)
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dev_dbg(&client->dev, "Timeout fault\n");
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if (rval & AS_FAULT_INFO_OVER_TEMPERATURE)
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dev_dbg(&client->dev, "Over temperature fault\n");
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if (rval & AS_FAULT_INFO_SHORT_CIRCUIT)
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dev_dbg(&client->dev, "Short circuit fault\n");
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if (rval & AS_FAULT_INFO_OVER_VOLTAGE)
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dev_dbg(&client->dev, "Over voltage fault: "
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"Indicates missing capacitor or open connection\n");
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return rval;
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}
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static int as3645a_get_ctrl(struct v4l2_ctrl *ctrl)
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{
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struct as3645a *flash =
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container_of(ctrl->handler, struct as3645a, ctrls);
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struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev);
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int value;
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switch (ctrl->id) {
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case V4L2_CID_FLASH_FAULT:
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value = as3645a_read_fault(flash);
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if (value < 0)
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return value;
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ctrl->cur.val = 0;
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if (value & AS_FAULT_INFO_SHORT_CIRCUIT)
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ctrl->cur.val |= V4L2_FLASH_FAULT_SHORT_CIRCUIT;
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if (value & AS_FAULT_INFO_OVER_TEMPERATURE)
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ctrl->cur.val |= V4L2_FLASH_FAULT_OVER_TEMPERATURE;
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if (value & AS_FAULT_INFO_TIMEOUT)
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ctrl->cur.val |= V4L2_FLASH_FAULT_TIMEOUT;
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if (value & AS_FAULT_INFO_OVER_VOLTAGE)
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ctrl->cur.val |= V4L2_FLASH_FAULT_OVER_VOLTAGE;
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if (value & AS_FAULT_INFO_INDUCTOR_PEAK_LIMIT)
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ctrl->cur.val |= V4L2_FLASH_FAULT_OVER_CURRENT;
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if (value & AS_FAULT_INFO_INDICATOR_LED)
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ctrl->cur.val |= V4L2_FLASH_FAULT_INDICATOR;
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break;
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case V4L2_CID_FLASH_STROBE_STATUS:
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if (flash->led_mode != V4L2_FLASH_LED_MODE_FLASH) {
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ctrl->cur.val = 0;
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break;
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}
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value = as3645a_is_active(flash);
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if (value < 0)
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return value;
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ctrl->cur.val = value;
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break;
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}
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dev_dbg(&client->dev, "G_CTRL %08x:%d\n", ctrl->id, ctrl->cur.val);
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return 0;
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}
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static int as3645a_set_ctrl(struct v4l2_ctrl *ctrl)
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{
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struct as3645a *flash =
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container_of(ctrl->handler, struct as3645a, ctrls);
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struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev);
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int ret;
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dev_dbg(&client->dev, "S_CTRL %08x:%d\n", ctrl->id, ctrl->val);
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/* If a control that doesn't apply to the current mode is modified,
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* we store the value and return immediately. The setting will be
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* applied when the LED mode is changed. Otherwise we apply the setting
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* immediately.
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*/
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switch (ctrl->id) {
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case V4L2_CID_FLASH_LED_MODE:
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if (flash->indicator_current)
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return -EBUSY;
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ret = as3645a_set_config(flash);
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if (ret < 0)
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return ret;
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flash->led_mode = ctrl->val;
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return as3645a_set_output(flash, false);
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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 <laurent.pinchart@ideasonboard.com>");
|
||||
MODULE_DESCRIPTION("LED flash driver for AS3645A, LM3555 and their clones");
|
||||
MODULE_LICENSE("GPL");
|
||||
71
include/media/as3645a.h
Normal file
71
include/media/as3645a.h
Normal file
@ -0,0 +1,71 @@
|
||||
/*
|
||||
* include/media/as3645a.h
|
||||
*
|
||||
* Copyright (C) 2008-2011 Nokia Corporation
|
||||
*
|
||||
* Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
|
||||
*
|
||||
* 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 */
|
||||
|
||||
#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__ */
|
||||
Loading…
Reference in New Issue
Block a user