--- /dev/null
+/*
+ * ths8200 - Texas Instruments THS8200 video encoder driver
+ *
+ * Copyright 2013 Cisco Systems, Inc. and/or its affiliates.
+ *
+ * This program is free software; you may redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed .as is. WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/v4l2-dv-timings.h>
+
+#include <media/v4l2-dv-timings.h>
+#include <media/v4l2-async.h>
+#include <media/v4l2-device.h>
+
+#include "ths8200_regs.h"
+
+static int debug;
+module_param(debug, int, 0644);
+MODULE_PARM_DESC(debug, "debug level (0-2)");
+
+MODULE_DESCRIPTION("Texas Instruments THS8200 video encoder driver");
+MODULE_AUTHOR("Mats Randgaard <mats.randgaard@cisco.com>");
+MODULE_AUTHOR("Martin Bugge <martin.bugge@cisco.com>");
+MODULE_LICENSE("GPL v2");
+
+struct ths8200_state {
+ struct v4l2_subdev sd;
+ uint8_t chip_version;
+ /* Is the ths8200 powered on? */
+ bool power_on;
+ struct v4l2_dv_timings dv_timings;
+};
+
+static const struct v4l2_dv_timings_cap ths8200_timings_cap = {
+ .type = V4L2_DV_BT_656_1120,
+ /* keep this initialization for compatibility with GCC < 4.4.6 */
+ .reserved = { 0 },
+ V4L2_INIT_BT_TIMINGS(0, 1920, 0, 1080, 25000000, 148500000,
+ V4L2_DV_BT_STD_CEA861, V4L2_DV_BT_CAP_PROGRESSIVE)
+};
+
+static inline struct ths8200_state *to_state(struct v4l2_subdev *sd)
+{
+ return container_of(sd, struct ths8200_state, sd);
+}
+
+static inline unsigned htotal(const struct v4l2_bt_timings *t)
+{
+ return V4L2_DV_BT_FRAME_WIDTH(t);
+}
+
+static inline unsigned vtotal(const struct v4l2_bt_timings *t)
+{
+ return V4L2_DV_BT_FRAME_HEIGHT(t);
+}
+
+static int ths8200_read(struct v4l2_subdev *sd, u8 reg)
+{
+ struct i2c_client *client = v4l2_get_subdevdata(sd);
+
+ return i2c_smbus_read_byte_data(client, reg);
+}
+
+static int ths8200_write(struct v4l2_subdev *sd, u8 reg, u8 val)
+{
+ struct i2c_client *client = v4l2_get_subdevdata(sd);
+ int ret;
+ int i;
+
+ for (i = 0; i < 3; i++) {
+ ret = i2c_smbus_write_byte_data(client, reg, val);
+ if (ret == 0)
+ return 0;
+ }
+ v4l2_err(sd, "I2C Write Problem\n");
+ return ret;
+}
+
+/* To set specific bits in the register, a clear-mask is given (to be AND-ed),
+ * and then the value-mask (to be OR-ed).
+ */
+static inline void
+ths8200_write_and_or(struct v4l2_subdev *sd, u8 reg,
+ uint8_t clr_mask, uint8_t val_mask)
+{
+ ths8200_write(sd, reg, (ths8200_read(sd, reg) & clr_mask) | val_mask);
+}
+
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+
+static int ths8200_g_register(struct v4l2_subdev *sd,
+ struct v4l2_dbg_register *reg)
+{
+ reg->val = ths8200_read(sd, reg->reg & 0xff);
+ reg->size = 1;
+
+ return 0;
+}
+
+static int ths8200_s_register(struct v4l2_subdev *sd,
+ const struct v4l2_dbg_register *reg)
+{
+ ths8200_write(sd, reg->reg & 0xff, reg->val & 0xff);
+
+ return 0;
+}
+#endif
+
+static int ths8200_log_status(struct v4l2_subdev *sd)
+{
+ struct ths8200_state *state = to_state(sd);
+ uint8_t reg_03 = ths8200_read(sd, THS8200_CHIP_CTL);
+
+ v4l2_info(sd, "----- Chip status -----\n");
+ v4l2_info(sd, "version: %u\n", state->chip_version);
+ v4l2_info(sd, "power: %s\n", (reg_03 & 0x0c) ? "off" : "on");
+ v4l2_info(sd, "reset: %s\n", (reg_03 & 0x01) ? "off" : "on");
+ v4l2_info(sd, "test pattern: %s\n",
+ (reg_03 & 0x20) ? "enabled" : "disabled");
+ v4l2_info(sd, "format: %ux%u\n",
+ ths8200_read(sd, THS8200_DTG2_PIXEL_CNT_MSB) * 256 +
+ ths8200_read(sd, THS8200_DTG2_PIXEL_CNT_LSB),
+ (ths8200_read(sd, THS8200_DTG2_LINE_CNT_MSB) & 0x07) * 256 +
+ ths8200_read(sd, THS8200_DTG2_LINE_CNT_LSB));
+ v4l2_print_dv_timings(sd->name, "Configured format:",
+ &state->dv_timings, true);
+ return 0;
+}
+
+/* Power up/down ths8200 */
+static int ths8200_s_power(struct v4l2_subdev *sd, int on)
+{
+ struct ths8200_state *state = to_state(sd);
+
+ v4l2_dbg(1, debug, sd, "%s: power %s\n", __func__, on ? "on" : "off");
+
+ state->power_on = on;
+
+ /* Power up/down - leave in reset state until input video is present */
+ ths8200_write_and_or(sd, THS8200_CHIP_CTL, 0xf2, (on ? 0x00 : 0x0c));
+
+ return 0;
+}
+
+static const struct v4l2_subdev_core_ops ths8200_core_ops = {
+ .log_status = ths8200_log_status,
+ .s_power = ths8200_s_power,
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+ .g_register = ths8200_g_register,
+ .s_register = ths8200_s_register,
+#endif
+};
+
+/* -----------------------------------------------------------------------------
+ * V4L2 subdev video operations
+ */
+
+static int ths8200_s_stream(struct v4l2_subdev *sd, int enable)
+{
+ struct ths8200_state *state = to_state(sd);
+
+ if (enable && !state->power_on)
+ ths8200_s_power(sd, true);
+
+ ths8200_write_and_or(sd, THS8200_CHIP_CTL, 0xfe,
+ (enable ? 0x01 : 0x00));
+
+ v4l2_dbg(1, debug, sd, "%s: %sable\n",
+ __func__, (enable ? "en" : "dis"));
+
+ return 0;
+}
+
+static void ths8200_core_init(struct v4l2_subdev *sd)
+{
+ /* setup clocks */
+ ths8200_write_and_or(sd, THS8200_CHIP_CTL, 0x3f, 0xc0);
+
+ /**** Data path control (DATA) ****/
+ /* Set FSADJ 700 mV,
+ * bypass 422-444 interpolation,
+ * input format 30 bit RGB444
+ */
+ ths8200_write(sd, THS8200_DATA_CNTL, 0x70);
+
+ /* DTG Mode (Video blocked during blanking
+ * VESA slave
+ */
+ ths8200_write(sd, THS8200_DTG1_MODE, 0x87);
+
+ /**** Display Timing Generator Control, Part 1 (DTG1). ****/
+
+ /* Disable embedded syncs on the output by setting
+ * the amplitude to zero for all channels.
+ */
+ ths8200_write(sd, THS8200_DTG1_Y_SYNC_MSB, 0x00);
+ ths8200_write(sd, THS8200_DTG1_CBCR_SYNC_MSB, 0x00);
+}
+
+static void ths8200_setup(struct v4l2_subdev *sd, struct v4l2_bt_timings *bt)
+{
+ uint8_t polarity = 0;
+ uint16_t line_start_active_video = (bt->vsync + bt->vbackporch);
+ uint16_t line_start_front_porch = (vtotal(bt) - bt->vfrontporch);
+
+ /*** System ****/
+ /* Set chip in reset while it is configured */
+ ths8200_s_stream(sd, false);
+
+ /* configure video output timings */
+ ths8200_write(sd, THS8200_DTG1_SPEC_A, bt->hsync);
+ ths8200_write(sd, THS8200_DTG1_SPEC_B, bt->hfrontporch);
+
+ /* Zero for progressive scan formats.*/
+ if (!bt->interlaced)
+ ths8200_write(sd, THS8200_DTG1_SPEC_C, 0x00);
+
+ /* Distance from leading edge of h sync to start of active video.
+ * MSB in 0x2b
+ */
+ ths8200_write(sd, THS8200_DTG1_SPEC_D_LSB,
+ (bt->hbackporch + bt->hsync) & 0xff);
+ /* Zero for SDTV-mode. MSB in 0x2b */
+ ths8200_write(sd, THS8200_DTG1_SPEC_E_LSB, 0x00);
+ /*
+ * MSB for dtg1_spec(d/e/h). See comment for
+ * corresponding LSB registers.
+ */
+ ths8200_write(sd, THS8200_DTG1_SPEC_DEH_MSB,
+ ((bt->hbackporch + bt->hsync) & 0x100) >> 1);
+
+ /* h front porch */
+ ths8200_write(sd, THS8200_DTG1_SPEC_K_LSB, (bt->hfrontporch) & 0xff);
+ ths8200_write(sd, THS8200_DTG1_SPEC_K_MSB,
+ ((bt->hfrontporch) & 0x700) >> 8);
+
+ /* Half the line length. Used to calculate SDTV line types. */
+ ths8200_write(sd, THS8200_DTG1_SPEC_G_LSB, (htotal(bt)/2) & 0xff);
+ ths8200_write(sd, THS8200_DTG1_SPEC_G_MSB,
+ ((htotal(bt)/2) >> 8) & 0x0f);
+
+ /* Total pixels per line (ex. 720p: 1650) */
+ ths8200_write(sd, THS8200_DTG1_TOT_PIXELS_MSB, htotal(bt) >> 8);
+ ths8200_write(sd, THS8200_DTG1_TOT_PIXELS_LSB, htotal(bt) & 0xff);
+
+ /* Frame height and field height */
+ /* Field height should be programmed higher than frame_size for
+ * progressive scan formats
+ */
+ ths8200_write(sd, THS8200_DTG1_FRAME_FIELD_SZ_MSB,
+ ((vtotal(bt) >> 4) & 0xf0) + 0x7);
+ ths8200_write(sd, THS8200_DTG1_FRAME_SZ_LSB, vtotal(bt) & 0xff);
+
+ /* Should be programmed higher than frame_size
+ * for progressive formats
+ */
+ if (!bt->interlaced)
+ ths8200_write(sd, THS8200_DTG1_FIELD_SZ_LSB, 0xff);
+
+ /**** Display Timing Generator Control, Part 2 (DTG2). ****/
+ /* Set breakpoint line numbers and types
+ * THS8200 generates line types with different properties. A line type
+ * that sets all the RGB-outputs to zero is used in the blanking areas,
+ * while a line type that enable the RGB-outputs is used in active video
+ * area. The line numbers for start of active video, start of front
+ * porch and after the last line in the frame must be set with the
+ * corresponding line types.
+ *
+ * Line types:
+ * 0x9 - Full normal sync pulse: Blocks data when dtg1_pass is off.
+ * Used in blanking area.
+ * 0x0 - Active video: Video data is always passed. Used in active
+ * video area.
+ */
+ ths8200_write_and_or(sd, THS8200_DTG2_BP1_2_MSB, 0x88,
+ ((line_start_active_video >> 4) & 0x70) +
+ ((line_start_front_porch >> 8) & 0x07));
+ ths8200_write(sd, THS8200_DTG2_BP3_4_MSB, ((vtotal(bt)) >> 4) & 0x70);
+ ths8200_write(sd, THS8200_DTG2_BP1_LSB, line_start_active_video & 0xff);
+ ths8200_write(sd, THS8200_DTG2_BP2_LSB, line_start_front_porch & 0xff);
+ ths8200_write(sd, THS8200_DTG2_BP3_LSB, (vtotal(bt)) & 0xff);
+
+ /* line types */
+ ths8200_write(sd, THS8200_DTG2_LINETYPE1, 0x90);
+ ths8200_write(sd, THS8200_DTG2_LINETYPE2, 0x90);
+
+ /* h sync width transmitted */
+ ths8200_write(sd, THS8200_DTG2_HLENGTH_LSB, bt->hsync & 0xff);
+ ths8200_write_and_or(sd, THS8200_DTG2_HLENGTH_LSB_HDLY_MSB, 0x3f,
+ (bt->hsync >> 2) & 0xc0);
+
+ /* The pixel value h sync is asserted on */
+ ths8200_write_and_or(sd, THS8200_DTG2_HLENGTH_LSB_HDLY_MSB, 0xe0,
+ (htotal(bt) >> 8) & 0x1f);
+ ths8200_write(sd, THS8200_DTG2_HLENGTH_HDLY_LSB, htotal(bt));
+
+ /* v sync width transmitted (must add 1 to get correct output) */
+ ths8200_write(sd, THS8200_DTG2_VLENGTH1_LSB, (bt->vsync + 1) & 0xff);
+ ths8200_write_and_or(sd, THS8200_DTG2_VLENGTH1_MSB_VDLY1_MSB, 0x3f,
+ ((bt->vsync + 1) >> 2) & 0xc0);
+
+ /* The pixel value v sync is asserted on (must add 1 to get correct output) */
+ ths8200_write_and_or(sd, THS8200_DTG2_VLENGTH1_MSB_VDLY1_MSB, 0xf8,
+ ((vtotal(bt) + 1) >> 8) & 0x7);
+ ths8200_write(sd, THS8200_DTG2_VDLY1_LSB, vtotal(bt) + 1);
+
+ /* For progressive video vlength2 must be set to all 0 and vdly2 must
+ * be set to all 1.
+ */
+ ths8200_write(sd, THS8200_DTG2_VLENGTH2_LSB, 0x00);
+ ths8200_write(sd, THS8200_DTG2_VLENGTH2_MSB_VDLY2_MSB, 0x07);
+ ths8200_write(sd, THS8200_DTG2_VDLY2_LSB, 0xff);
+
+ /* Internal delay factors to synchronize the sync pulses and the data */
+ /* Experimental values delays (hor 0, ver 0) */
+ ths8200_write(sd, THS8200_DTG2_HS_IN_DLY_MSB, 0);
+ ths8200_write(sd, THS8200_DTG2_HS_IN_DLY_LSB, 0);
+ ths8200_write(sd, THS8200_DTG2_VS_IN_DLY_MSB, 0);
+ ths8200_write(sd, THS8200_DTG2_VS_IN_DLY_LSB, 0);
+
+ /* Polarity of received and transmitted sync signals */
+ if (bt->polarities & V4L2_DV_HSYNC_POS_POL) {
+ polarity |= 0x01; /* HS_IN */
+ polarity |= 0x08; /* HS_OUT */
+ }
+ if (bt->polarities & V4L2_DV_VSYNC_POS_POL) {
+ polarity |= 0x02; /* VS_IN */
+ polarity |= 0x10; /* VS_OUT */
+ }
+
+ /* RGB mode, no embedded timings */
+ /* Timing of video input bus is derived from HS, VS, and FID dedicated
+ * inputs
+ */
+ ths8200_write(sd, THS8200_DTG2_CNTL, 0x44 | polarity);
+
+ /* leave reset */
+ ths8200_s_stream(sd, true);
+
+ v4l2_dbg(1, debug, sd, "%s: frame %dx%d, polarity %d\n"
+ "horizontal: front porch %d, back porch %d, sync %d\n"
+ "vertical: sync %d\n", __func__, htotal(bt), vtotal(bt),
+ polarity, bt->hfrontporch, bt->hbackporch,
+ bt->hsync, bt->vsync);
+}
+
+static int ths8200_s_dv_timings(struct v4l2_subdev *sd,
+ struct v4l2_dv_timings *timings)
+{
+ struct ths8200_state *state = to_state(sd);
+
+ v4l2_dbg(1, debug, sd, "%s:\n", __func__);
+
+ if (!v4l2_valid_dv_timings(timings, &ths8200_timings_cap,
+ NULL, NULL))
+ return -EINVAL;
+
+ if (!v4l2_find_dv_timings_cap(timings, &ths8200_timings_cap, 10,
+ NULL, NULL)) {
+ v4l2_dbg(1, debug, sd, "Unsupported format\n");
+ return -EINVAL;
+ }
+
+ timings->bt.flags &= ~V4L2_DV_FL_REDUCED_FPS;
+
+ /* save timings */
+ state->dv_timings = *timings;
+
+ ths8200_setup(sd, &timings->bt);
+
+ return 0;
+}
+
+static int ths8200_g_dv_timings(struct v4l2_subdev *sd,
+ struct v4l2_dv_timings *timings)
+{
+ struct ths8200_state *state = to_state(sd);
+
+ v4l2_dbg(1, debug, sd, "%s:\n", __func__);
+
+ *timings = state->dv_timings;
+
+ return 0;
+}
+
+static int ths8200_enum_dv_timings(struct v4l2_subdev *sd,
+ struct v4l2_enum_dv_timings *timings)
+{
+ if (timings->pad != 0)
+ return -EINVAL;
+
+ return v4l2_enum_dv_timings_cap(timings, &ths8200_timings_cap,
+ NULL, NULL);
+}
+
+static int ths8200_dv_timings_cap(struct v4l2_subdev *sd,
+ struct v4l2_dv_timings_cap *cap)
+{
+ if (cap->pad != 0)
+ return -EINVAL;
+
+ *cap = ths8200_timings_cap;
+ return 0;
+}
+
+/* Specific video subsystem operation handlers */
+static const struct v4l2_subdev_video_ops ths8200_video_ops = {
+ .s_stream = ths8200_s_stream,
+ .s_dv_timings = ths8200_s_dv_timings,
+ .g_dv_timings = ths8200_g_dv_timings,
+};
+
+static const struct v4l2_subdev_pad_ops ths8200_pad_ops = {
+ .enum_dv_timings = ths8200_enum_dv_timings,
+ .dv_timings_cap = ths8200_dv_timings_cap,
+};
+
+/* V4L2 top level operation handlers */
+static const struct v4l2_subdev_ops ths8200_ops = {
+ .core = &ths8200_core_ops,
+ .video = &ths8200_video_ops,
+ .pad = &ths8200_pad_ops,
+};
+
+static int ths8200_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct ths8200_state *state;
+ struct v4l2_subdev *sd;
+ int error;
+
+ /* Check if the adapter supports the needed features */
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+ return -EIO;
+
+ state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL);
+ if (!state)
+ return -ENOMEM;
+
+ sd = &state->sd;
+ v4l2_i2c_subdev_init(sd, client, &ths8200_ops);
+
+ state->chip_version = ths8200_read(sd, THS8200_VERSION);
+ v4l2_dbg(1, debug, sd, "chip version 0x%x\n", state->chip_version);
+
+ ths8200_core_init(sd);
+
+ error = v4l2_async_register_subdev(&state->sd);
+ if (error)
+ return error;
+
+ v4l2_info(sd, "%s found @ 0x%x (%s)\n", client->name,
+ client->addr << 1, client->adapter->name);
+
+ return 0;
+}
+
+static int ths8200_remove(struct i2c_client *client)
+{
+ struct v4l2_subdev *sd = i2c_get_clientdata(client);
+ struct ths8200_state *decoder = to_state(sd);
+
+ v4l2_dbg(1, debug, sd, "%s removed @ 0x%x (%s)\n", client->name,
+ client->addr << 1, client->adapter->name);
+
+ ths8200_s_power(sd, false);
+ v4l2_async_unregister_subdev(&decoder->sd);
+
+ return 0;
+}
+
+static struct i2c_device_id ths8200_id[] = {
+ { "ths8200", 0 },
+ {},
+};
+MODULE_DEVICE_TABLE(i2c, ths8200_id);
+
+#if IS_ENABLED(CONFIG_OF)
+static const struct of_device_id ths8200_of_match[] = {
+ { .compatible = "ti,ths8200", },
+ { /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, ths8200_of_match);
+#endif
+
+static struct i2c_driver ths8200_driver = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "ths8200",
+ .of_match_table = of_match_ptr(ths8200_of_match),
+ },
+ .probe = ths8200_probe,
+ .remove = ths8200_remove,
+ .id_table = ths8200_id,
+};
+
+module_i2c_driver(ths8200_driver);
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