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path: root/drivers/media/i2c/wm8775.c
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Diffstat (limited to 'drivers/media/i2c/wm8775.c')
-rw-r--r--drivers/media/i2c/wm8775.c306
1 files changed, 306 insertions, 0 deletions
diff --git a/drivers/media/i2c/wm8775.c b/drivers/media/i2c/wm8775.c
new file mode 100644
index 0000000000..d1b716fd6f
--- /dev/null
+++ b/drivers/media/i2c/wm8775.c
@@ -0,0 +1,306 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * wm8775 - driver version 0.0.1
+ *
+ * Copyright (C) 2004 Ulf Eklund <ivtv at eklund.to>
+ *
+ * Based on saa7115 driver
+ *
+ * Copyright (C) 2005 Hans Verkuil <hverkuil@xs4all.nl>
+ * - Cleanup
+ * - V4L2 API update
+ * - sound fixes
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/ioctl.h>
+#include <linux/uaccess.h>
+#include <linux/i2c.h>
+#include <linux/videodev2.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-ctrls.h>
+#include <media/i2c/wm8775.h>
+
+MODULE_DESCRIPTION("wm8775 driver");
+MODULE_AUTHOR("Ulf Eklund, Hans Verkuil");
+MODULE_LICENSE("GPL");
+
+
+
+/* ----------------------------------------------------------------------- */
+
+enum {
+ R7 = 7, R11 = 11,
+ R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R23 = 23,
+ TOT_REGS
+};
+
+#define ALC_HOLD 0x85 /* R17: use zero cross detection, ALC hold time 42.6 ms */
+#define ALC_EN 0x100 /* R17: ALC enable */
+
+struct wm8775_state {
+ struct v4l2_subdev sd;
+ struct v4l2_ctrl_handler hdl;
+ struct v4l2_ctrl *mute;
+ struct v4l2_ctrl *vol;
+ struct v4l2_ctrl *bal;
+ struct v4l2_ctrl *loud;
+ u8 input; /* Last selected input (0-0xf) */
+};
+
+static inline struct wm8775_state *to_state(struct v4l2_subdev *sd)
+{
+ return container_of(sd, struct wm8775_state, sd);
+}
+
+static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl)
+{
+ return &container_of(ctrl->handler, struct wm8775_state, hdl)->sd;
+}
+
+static int wm8775_write(struct v4l2_subdev *sd, int reg, u16 val)
+{
+ struct i2c_client *client = v4l2_get_subdevdata(sd);
+ int i;
+
+ if (reg < 0 || reg >= TOT_REGS) {
+ v4l2_err(sd, "Invalid register R%d\n", reg);
+ return -1;
+ }
+
+ for (i = 0; i < 3; i++)
+ if (i2c_smbus_write_byte_data(client,
+ (reg << 1) | (val >> 8), val & 0xff) == 0)
+ return 0;
+ v4l2_err(sd, "I2C: cannot write %03x to register R%d\n", val, reg);
+ return -1;
+}
+
+static void wm8775_set_audio(struct v4l2_subdev *sd, int quietly)
+{
+ struct wm8775_state *state = to_state(sd);
+ u8 vol_l, vol_r;
+ int muted = 0 != state->mute->val;
+ u16 volume = (u16)state->vol->val;
+ u16 balance = (u16)state->bal->val;
+
+ /* normalize ( 65535 to 0 -> 255 to 0 (+24dB to -103dB) ) */
+ vol_l = (min(65536 - balance, 32768) * volume) >> 23;
+ vol_r = (min(balance, (u16)32768) * volume) >> 23;
+
+ /* Mute */
+ if (muted || quietly)
+ wm8775_write(sd, R21, 0x0c0 | state->input);
+
+ wm8775_write(sd, R14, vol_l | 0x100); /* 0x100= Left channel ADC zero cross enable */
+ wm8775_write(sd, R15, vol_r | 0x100); /* 0x100= Right channel ADC zero cross enable */
+
+ /* Un-mute */
+ if (!muted)
+ wm8775_write(sd, R21, state->input);
+}
+
+static int wm8775_s_routing(struct v4l2_subdev *sd,
+ u32 input, u32 output, u32 config)
+{
+ struct wm8775_state *state = to_state(sd);
+
+ /* There are 4 inputs and one output. Zero or more inputs
+ are multiplexed together to the output. Hence there are
+ 16 combinations.
+ If only one input is active (the normal case) then the
+ input values 1, 2, 4 or 8 should be used. */
+ if (input > 15) {
+ v4l2_err(sd, "Invalid input %d.\n", input);
+ return -EINVAL;
+ }
+ state->input = input;
+ if (v4l2_ctrl_g_ctrl(state->mute))
+ return 0;
+ if (!v4l2_ctrl_g_ctrl(state->vol))
+ return 0;
+ wm8775_set_audio(sd, 1);
+ return 0;
+}
+
+static int wm8775_s_ctrl(struct v4l2_ctrl *ctrl)
+{
+ struct v4l2_subdev *sd = to_sd(ctrl);
+
+ switch (ctrl->id) {
+ case V4L2_CID_AUDIO_MUTE:
+ case V4L2_CID_AUDIO_VOLUME:
+ case V4L2_CID_AUDIO_BALANCE:
+ wm8775_set_audio(sd, 0);
+ return 0;
+ case V4L2_CID_AUDIO_LOUDNESS:
+ wm8775_write(sd, R17, (ctrl->val ? ALC_EN : 0) | ALC_HOLD);
+ return 0;
+ }
+ return -EINVAL;
+}
+
+static int wm8775_log_status(struct v4l2_subdev *sd)
+{
+ struct wm8775_state *state = to_state(sd);
+
+ v4l2_info(sd, "Input: %d\n", state->input);
+ v4l2_ctrl_handler_log_status(&state->hdl, sd->name);
+ return 0;
+}
+
+static int wm8775_s_frequency(struct v4l2_subdev *sd, const struct v4l2_frequency *freq)
+{
+ wm8775_set_audio(sd, 0);
+ return 0;
+}
+
+/* ----------------------------------------------------------------------- */
+
+static const struct v4l2_ctrl_ops wm8775_ctrl_ops = {
+ .s_ctrl = wm8775_s_ctrl,
+};
+
+static const struct v4l2_subdev_core_ops wm8775_core_ops = {
+ .log_status = wm8775_log_status,
+};
+
+static const struct v4l2_subdev_tuner_ops wm8775_tuner_ops = {
+ .s_frequency = wm8775_s_frequency,
+};
+
+static const struct v4l2_subdev_audio_ops wm8775_audio_ops = {
+ .s_routing = wm8775_s_routing,
+};
+
+static const struct v4l2_subdev_ops wm8775_ops = {
+ .core = &wm8775_core_ops,
+ .tuner = &wm8775_tuner_ops,
+ .audio = &wm8775_audio_ops,
+};
+
+/* ----------------------------------------------------------------------- */
+
+/* i2c implementation */
+
+/*
+ * Generic i2c probe
+ * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
+ */
+
+static int wm8775_probe(struct i2c_client *client)
+{
+ struct wm8775_state *state;
+ struct v4l2_subdev *sd;
+ int err;
+ bool is_nova_s = false;
+
+ if (client->dev.platform_data) {
+ struct wm8775_platform_data *data = client->dev.platform_data;
+ is_nova_s = data->is_nova_s;
+ }
+
+ /* Check if the adapter supports the needed features */
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+ return -EIO;
+
+ v4l_info(client, "chip found @ 0x%02x (%s)\n",
+ client->addr << 1, client->adapter->name);
+
+ state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL);
+ if (state == NULL)
+ return -ENOMEM;
+ sd = &state->sd;
+ v4l2_i2c_subdev_init(sd, client, &wm8775_ops);
+ state->input = 2;
+
+ v4l2_ctrl_handler_init(&state->hdl, 4);
+ state->mute = v4l2_ctrl_new_std(&state->hdl, &wm8775_ctrl_ops,
+ V4L2_CID_AUDIO_MUTE, 0, 1, 1, 0);
+ state->vol = v4l2_ctrl_new_std(&state->hdl, &wm8775_ctrl_ops,
+ V4L2_CID_AUDIO_VOLUME, 0, 65535, (65535+99)/100, 0xCF00); /* 0dB*/
+ state->bal = v4l2_ctrl_new_std(&state->hdl, &wm8775_ctrl_ops,
+ V4L2_CID_AUDIO_BALANCE, 0, 65535, (65535+99)/100, 32768);
+ state->loud = v4l2_ctrl_new_std(&state->hdl, &wm8775_ctrl_ops,
+ V4L2_CID_AUDIO_LOUDNESS, 0, 1, 1, 1);
+ sd->ctrl_handler = &state->hdl;
+ err = state->hdl.error;
+ if (err) {
+ v4l2_ctrl_handler_free(&state->hdl);
+ return err;
+ }
+
+ /* Initialize wm8775 */
+
+ /* RESET */
+ wm8775_write(sd, R23, 0x000);
+ /* Disable zero cross detect timeout */
+ wm8775_write(sd, R7, 0x000);
+ /* HPF enable, left justified, 24-bit (Philips) mode */
+ wm8775_write(sd, R11, 0x021);
+ /* Master mode, clock ratio 256fs */
+ wm8775_write(sd, R12, 0x102);
+ /* Powered up */
+ wm8775_write(sd, R13, 0x000);
+
+ if (!is_nova_s) {
+ /* ADC gain +2.5dB, enable zero cross */
+ wm8775_write(sd, R14, 0x1d4);
+ /* ADC gain +2.5dB, enable zero cross */
+ wm8775_write(sd, R15, 0x1d4);
+ /* ALC Stereo, ALC target level -1dB FS max gain +8dB */
+ wm8775_write(sd, R16, 0x1bf);
+ /* Enable gain control, use zero cross detection,
+ ALC hold time 42.6 ms */
+ wm8775_write(sd, R17, 0x185);
+ } else {
+ /* ALC stereo, ALC target level -5dB FS, ALC max gain +8dB */
+ wm8775_write(sd, R16, 0x1bb);
+ /* Set ALC mode and hold time */
+ wm8775_write(sd, R17, (state->loud->val ? ALC_EN : 0) | ALC_HOLD);
+ }
+ /* ALC gain ramp up delay 34 s, ALC gain ramp down delay 33 ms */
+ wm8775_write(sd, R18, 0x0a2);
+ /* Enable noise gate, threshold -72dBfs */
+ wm8775_write(sd, R19, 0x005);
+ if (!is_nova_s) {
+ /* Transient window 4ms, lower PGA gain limit -1dB */
+ wm8775_write(sd, R20, 0x07a);
+ /* LRBOTH = 1, use input 2. */
+ wm8775_write(sd, R21, 0x102);
+ } else {
+ /* Transient window 4ms, ALC min gain -5dB */
+ wm8775_write(sd, R20, 0x0fb);
+
+ wm8775_set_audio(sd, 1); /* set volume/mute/mux */
+ }
+ return 0;
+}
+
+static void wm8775_remove(struct i2c_client *client)
+{
+ struct v4l2_subdev *sd = i2c_get_clientdata(client);
+ struct wm8775_state *state = to_state(sd);
+
+ v4l2_device_unregister_subdev(sd);
+ v4l2_ctrl_handler_free(&state->hdl);
+}
+
+static const struct i2c_device_id wm8775_id[] = {
+ { "wm8775", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, wm8775_id);
+
+static struct i2c_driver wm8775_driver = {
+ .driver = {
+ .name = "wm8775",
+ },
+ .probe = wm8775_probe,
+ .remove = wm8775_remove,
+ .id_table = wm8775_id,
+};
+
+module_i2c_driver(wm8775_driver);