Message-Id: <1345632319-23224-1-git-send-email-volokh84@gmail.com>
Date:	Wed, 22 Aug 2012 14:45:10 +0400
From:	Volokh Konstantin <volokh84@...il.com>
To:	linux-media@...r.kernel.org, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org, volokh@...ros.ru
Cc:	Volokh Konstantin <volokh84@...il.com>
Subject: [PATCH 01/10] staging: media: go7007: Some additional code for TW2804 driver functionality

- using new v4l2 framework controls
- function for reading volatile controls via i2c bus
- separate V4L2_CID_ ctrls into each V4L2 calls

Signed-off-by: Volokh Konstantin <volokh84@...il.com>
---
 drivers/staging/media/go7007/wis-tw2804.c |  248 +++++++++++++++++++++++++++++
 1 files changed, 248 insertions(+), 0 deletions(-)

diff --git a/drivers/staging/media/go7007/wis-tw2804.c b/drivers/staging/media/go7007/wis-tw2804.c
index 9134f03..05851d3 100644
--- a/drivers/staging/media/go7007/wis-tw2804.c
+++ b/drivers/staging/media/go7007/wis-tw2804.c
@@ -21,10 +21,18 @@
 #include <linux/videodev2.h>
 #include <linux/ioctl.h>
 #include <linux/slab.h>
+#include <media/v4l2-subdev.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-chip-ident.h>
+#include <media/v4l2-ctrls.h>
 
 #include "wis-i2c.h"
 
 struct wis_tw2804 {
+	struct v4l2_subdev sd;
+	struct v4l2_ctrl_handler hdl;
+	u8 channel:2;
+	u8 input:1;
 	int channel;
 	int norm;
 	int brightness;
@@ -116,9 +124,246 @@ static int write_regs(struct i2c_client *client, u8 *regs, int channel)
 		if (i2c_smbus_write_byte_data(client,
 				regs[i] | (channel << 6), regs[i + 1]) < 0)
 			return -1;
+static s32 read_reg(struct i2c_client *client, u8 reg, u8 channel)
+{
+	return i2c_smbus_read_byte_data(client, (reg) | (channel << 6));
+}
+
+inline struct wis_tw2804 *to_state(struct v4l2_subdev *sd)
+{
+	return container_of(sd, struct wis_tw2804, sd);
+}
+
+inline struct wis_tw2804 *to_state_from_ctrl(struct v4l2_ctrl *ctrl)
+{
+	return container_of(ctrl->handler, struct wis_tw2804, hdl);
+}
+
+static int tw2804_log_status(struct v4l2_subdev *sd)
+{
+	struct wis_tw2804 *state = to_state(sd);
+	v4l2_info(sd, "Standard: %s\n",
+			state->norm == V4L2_STD_NTSC ? "NTSC" :
+			state->norm == V4L2_STD_PAL ? "PAL" : "unknown");
+	v4l2_info(sd, "Channel: %d\n", state->channel);
+	v4l2_info(sd, "Input: %d\n", state->input);
+	v4l2_ctrl_handler_log_status(&state->hdl, sd->name);
+	return 0;
+}
+
+static s32 get_ctrl_addr(int ctrl)
+{
+	switch (ctrl) {
+	case V4L2_CID_BRIGHTNESS:
+		return 0x12;
+	case V4L2_CID_CONTRAST:
+		return 0x11;
+	case V4L2_CID_SATURATION:
+		return 0x10;
+	case V4L2_CID_HUE:
+		return 0x0f;
+	case V4L2_CID_AUTOGAIN:
+		return 0x02;
+	case V4L2_CID_COLOR_KILLER:
+		return 0x14;
+	case V4L2_CID_GAIN:
+		return 0x3c;
+	case V4L2_CID_CHROMA_GAIN:
+		return 0x3d;
+	case V4L2_CID_RED_BALANCE:
+		return 0x3f;
+	case V4L2_CID_BLUE_BALANCE:
+		return 0x3e;
+	default:
+		return -EINVAL;
+	}
+}
+
+static int tw2804_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
+{
+	struct v4l2_subdev *sd = &to_state_from_ctrl(ctrl)->sd;
+	struct i2c_client *client = v4l2_get_subdevdata(sd);
+	s32 addr = get_ctrl_addr(ctrl->id);
+
+	if (addr == -EINVAL)
+		return -EINVAL;
+
+	switch (ctrl->id) {
+	case V4L2_CID_GAIN:
+	case V4L2_CID_CHROMA_GAIN:
+	case V4L2_CID_RED_BALANCE:
+	case V4L2_CID_BLUE_BALANCE:
+		ctrl->cur.val = read_reg(client, addr, 0);
+		break;
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static int tw2804_s_ctrl(struct v4l2_ctrl *ctrl)
+{
+	struct wis_tw2804 *state = to_state_from_ctrl(ctrl);
+	struct v4l2_subdev *sd = &state->sd;
+	struct i2c_client *client = v4l2_get_subdevdata(sd);
+	s32 reg = ctrl->val;
+	s32 addr = get_ctrl_addr(ctrl->id);
+
+	if (addr == -EINVAL)
+		return -EINVAL;
+
+	switch (ctrl->id) {
+	case V4L2_CID_AUTOGAIN:
+		reg = read_reg(client, addr, state->channel);
+		if (reg > 0) {
+			if (ctrl->val == 0)
+				reg &= ~(1<<7);
+			else
+				reg |= 1<<7;
+		} else
+			return reg;
+		break;
+	case V4L2_CID_COLOR_KILLER:
+		reg = read_reg(client, addr, state->channel);
+		if (reg > 0)
+			reg = (reg & ~(0x03)) | (ctrl->val == 0 ? 0x02 : 0x03);
+		else
+			return reg;
+		break;
+	default:
+		break;
+	}
+
+	reg = reg > 255 ? 255 : (reg < 0 ? 0 : reg);
+	reg = write_reg(client, addr, (u8)reg,
+			ctrl->id == V4L2_CID_GAIN ||
+			ctrl->id == V4L2_CID_CHROMA_GAIN ||
+			ctrl->id == V4L2_CID_RED_BALANCE ||
+			ctrl->id == V4L2_CID_BLUE_BALANCE ? 0 : state->channel);
+
+	if (reg < 0) {
+		v4l2_err(sd, "Can`t set_ctrl value:id=%d;value=%d\n", ctrl->id,
+								    ctrl->val);
+		return reg;
+	}
+	return 0;
+}
+
+static int tw2804_s_std(struct v4l2_subdev *sd, v4l2_std_id norm)
+{
+	struct wis_tw2804 *dec = to_state(sd);
+	struct i2c_client *client = v4l2_get_subdevdata(sd);
+
+	u8 regs[] = {
+		0x01, norm&V4L2_STD_NTSC ? 0xc4 : 0x84,
+		0x09, norm&V4L2_STD_NTSC ? 0x07 : 0x04,
+		0x0a, norm&V4L2_STD_NTSC ? 0xf0 : 0x20,
+		0x0b, norm&V4L2_STD_NTSC ? 0x07 : 0x04,
+		0x0c, norm&V4L2_STD_NTSC ? 0xf0 : 0x20,
+		0x0d, norm&V4L2_STD_NTSC ? 0x40 : 0x4a,
+		0x16, norm&V4L2_STD_NTSC ? 0x00 : 0x40,
+		0x17, norm&V4L2_STD_NTSC ? 0x00 : 0x40,
+		0x20, norm&V4L2_STD_NTSC ? 0x07 : 0x0f,
+		0x21, norm&V4L2_STD_NTSC ? 0x07 : 0x0f,
+		0xff, 0xff,
+	};
+	write_regs(client, regs, dec->channel);
+	dec->norm = norm;
+	return 0;
+}
+
+static int tw2804_g_chip_ident(struct v4l2_subdev *sd,
+				struct v4l2_dbg_chip_ident *chip)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(sd);
+	return v4l2_chip_ident_i2c_client(client, chip,
+					V4L2_IDENT_TW2804, 0x0e);
+}
+
+static const struct v4l2_ctrl_ops tw2804_ctrl_ops = {
+	.g_volatile_ctrl = tw2804_g_volatile_ctrl,
+	.s_ctrl = tw2804_s_ctrl,
+};
+
+static const struct v4l2_subdev_core_ops tw2804_core_ops = {
+	.log_status = tw2804_log_status,
+	.g_chip_ident = tw2804_g_chip_ident,
+	.g_ext_ctrls = v4l2_subdev_g_ext_ctrls,
+	.try_ext_ctrls = v4l2_subdev_try_ext_ctrls,
+	.s_ext_ctrls = v4l2_subdev_s_ext_ctrls,
+	.g_ctrl = v4l2_subdev_g_ctrl,
+	.s_ctrl = v4l2_subdev_s_ctrl,
+	.queryctrl = v4l2_subdev_queryctrl,
+	.querymenu = v4l2_subdev_querymenu,
+	.s_std = tw2804_s_std,
+};
+
+static int tw2804_s_video_routing(struct v4l2_subdev *sd, u32 input, u32 output,
+	u32 config)
+{
+	struct wis_tw2804 *dec = to_state(sd);
+	struct i2c_client *client = v4l2_get_subdevdata(sd);
+	s32 reg = 0;
+
+	if (0 > input || input > 1)
+		return -EINVAL;
+
+	if (input == dec->input)
+		return 0;
+
+	reg = read_reg(client, 0x22, dec->channel);
+
+	if (reg >= 0) {
+		if (input == 0)
+			reg &= ~(1<<2);
+		else
+			reg |= 1<<2;
+		reg = write_reg(client, 0x22, (u8)reg, dec->channel);
+	}
+
+	if (reg >= 0)
+		dec->input = input;
+	else
+		return reg;
 	return 0;
 }
 
+static int tw2804_s_mbus_fmt(struct v4l2_subdev *sd,
+	struct v4l2_mbus_framefmt *fmt)
+{
+	/*TODO need select between 3fmt:
+	 * bt_656,
+	 * bt_601_8bit,
+	 * bt_656_dual,
+	 */
+	return 0;
+}
+
+static int tw2804_s_stream(struct v4l2_subdev *sd, int enable)
+{
+	struct wis_tw2804 *dec = to_state(sd);
+	struct i2c_client *client = v4l2_get_subdevdata(sd);
+	u32 reg = read_reg(client, 0x78, 0);
+
+	if (enable == 1)
+		write_reg(client, 0x78, reg & ~(1<<dec->channel), 0);
+	else
+		write_reg(client, 0x78, reg | (1<<dec->channel), 0);
+
+	return 0;
+}
+
+static const struct v4l2_subdev_video_ops tw2804_video_ops = {
+	.s_routing = tw2804_s_video_routing,
+	.s_mbus_fmt = tw2804_s_mbus_fmt,
+	.s_stream = tw2804_s_stream,
+};
+
+static const struct v4l2_subdev_ops tw2804_ops = {
+	.core = &tw2804_core_ops,
+	.video = &tw2804_video_ops,
+};
+
 static int wis_tw2804_command(struct i2c_client *client,
 				unsigned int cmd, void *arg)
 {
@@ -355,3 +600,6 @@ module_init(wis_tw2804_init);
 module_exit(wis_tw2804_cleanup);
 
 MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("TW2804/TW2802 V4L2 i2c driver");
+MODULE_AUTHOR("Volokh Konstantin <volokh84@...il.com>");
+MODULE_AUTHOR("Micronas USA Inc");
-- 
1.7.7.6

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