[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>

1 files changed, 71 insertions, 0 deletions

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 <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__ */