[PATCH v1 2/2] media: i2c: Add GT97xx VCM driver

Zhi Mao
2024-04-20T01:21:56Z

Add a V4L2 sub-device driver for Giantec GT97xx VCM.

Signed-off-by: Zhi Mao <zhi.mao@mediatek.com>
---
drivers/media/i2c/Kconfig | 13 ++
drivers/media/i2c/Makefile | 1 +
drivers/media/i2c/gt97xx.c | 436 +++++++++++++++++++++++++++++++++++++
3 files changed, 450 insertions(+)
create mode 100644 drivers/media/i2c/gt97xx.c

diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
index 56f276b920ab..fcb330cebfe0 100644
--- a/drivers/media/i2c/Kconfig
+++ b/drivers/media/i2c/Kconfig
@@ -759,6 +759,19 @@ config VIDEO_DW9807_VCM
capability. This is designed for linear control of
voice coil motors, controlled via I2C serial interface.

+config VIDEO_GT97XX
+ tristate "GT97xx lens voice coil support"
+ depends on I2C && VIDEO_DEV
+ select MEDIA_CONTROLLER
+ select VIDEO_V4L2_SUBDEV_API
+ select V4L2_FWNODE
+ select V4L2_CCI_I2C
+ help
+ This is a driver for the GT97xx camera lens voice coil.
+ GT97xx is a 10 bit DAC with 100mA output current sink
+ capability. It is designed for linear control of
+ voice coil motors, controlled via I2C serial interface.
+
endmenu

menu "Flash devices"
diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
index dfbe6448b549..af36a7aa3d12 100644
--- a/drivers/media/i2c/Makefile
+++ b/drivers/media/i2c/Makefile
@@ -39,6 +39,7 @@ obj-$(CONFIG_VIDEO_DW9807_VCM) += dw9807-vcm.o
obj-$(CONFIG_VIDEO_ET8EK8) += et8ek8/
obj-$(CONFIG_VIDEO_GC0308) += gc0308.o
obj-$(CONFIG_VIDEO_GC2145) += gc2145.o
+obj-$(CONFIG_VIDEO_GT97XX) += gt97xx.o
obj-$(CONFIG_VIDEO_HI556) += hi556.o
obj-$(CONFIG_VIDEO_HI846) += hi846.o
obj-$(CONFIG_VIDEO_HI847) += hi847.o
diff --git a/drivers/media/i2c/gt97xx.c b/drivers/media/i2c/gt97xx.c
new file mode 100644
index 000000000000..ccae190ffba6
--- /dev/null
+++ b/drivers/media/i2c/gt97xx.c
@@ -0,0 +1,436 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Driver for Giantec gt97xx VCM lens device
+ *
+ * Copyright 2024 MediaTek
+ *
+ * Zhi Mao <zhi.mao@mediatek.com>
+ */
+#include <linux/array_size.h>
+#include <linux/bits.h>
+#include <linux/clk.h>
+#include <linux/container_of.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/gpio/consumer.h>
+#include <linux/mod_devicetable.h>
+#include <linux/pm_runtime.h>
+#include <linux/property.h>
+#include <linux/regulator/consumer.h>
+#include <linux/types.h>
+#include <linux/units.h>
+
+#include <media/v4l2-cci.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-event.h>
+#include <media/v4l2-fwnode.h>
+#include <media/v4l2-subdev.h>
+
+/* gt97xx chip info register and name */
+#define GT97XX_IC_INFO_REG CCI_REG8(0x00)
+#define GT9768_ID 0xE9
+#define GT9769_ID 0xE1
+#define GT97XX_NAME "gt97xx"
+
+/*
+ * Ring control and Power control register
+ * Bit[1] RING_EN
+ * 0: Direct mode
+ * 1: AAC mode (ringing control mode)
+ * Bit[0] PD
+ * 0: Normal operation mode
+ * 1: Power down mode
+ * requires waiting time after PD reset takes place.
+ */
+#define GT97XX_RING_PD_CONTROL_REG CCI_REG8(0x02)
+#define GT97XX_PD_MODE_OFF 0x00
+#define GT97XX_PD_MODE_EN BIT(0)
+#define GT97XX_AAC_MODE_EN BIT(1)
+
+/*
+ * DAC is a 10bit address to control the VCM position.
+ * DAC_MSB: D[9:8] (ADD: 0x03)
+ * DAC_LSB: D[7:0] (ADD: 0x04)
+ */
+#define GT97XX_DAC_ADDR_REG CCI_REG16(0x03)
+
+#define GT97XX_MOVE_STEPS 16
+#define GT97XX_MAX_FOCUS_POS (BIT(10) - 1)
+
+#define GT97XX_SLEEP_US (1 * USEC_PER_MSEC)
+
+enum vcm_giantec_reg_desc {
+ GT_IC_INFO_REG,
+ GT_RING_PD_CONTROL_REG,
+ GT_DAC_ADDR_REG,
+ GT_MAX_REG
+};
+
+struct vcm_giantec_of_data {
+ unsigned int id;
+ unsigned int regs[GT_MAX_REG];
+};
+
+static const char *const gt97xx_supply_names[] = {
+ "vin",
+ "vdd",
+};
+
+/* gt97xx device structure */
+struct gt97xx {
+ struct v4l2_subdev sd;
+
+ struct regulator_bulk_data supplies[ARRAY_SIZE(gt97xx_supply_names)];
+
+ struct v4l2_ctrl_handler ctrls;
+ struct v4l2_ctrl *focus;
+
+ struct regmap *regmap;
+
+ const struct vcm_giantec_of_data *chip;
+};
+
+static inline struct gt97xx *sd_to_gt97xx(struct v4l2_subdev *subdev)
+{
+ return container_of(subdev, struct gt97xx, sd);
+}
+
+struct regval_list {
+ u8 reg_num;
+ u8 value;
+};
+
+static int gt97xx_set_dac(struct gt97xx *gt97xx, u16 val)
+{
+ /* Write VCM position to registers */
+ return cci_write(gt97xx->regmap,
+ gt97xx->chip->regs[GT_DAC_ADDR_REG], val, NULL);
+}
+
+static int gt97xx_identify_module(struct gt97xx *gt97xx)
+{
+ int ret;
+ u64 ic_id;
+ struct i2c_client *client = v4l2_get_subdevdata(&gt97xx->sd);
+
+ ret = cci_read(gt97xx->regmap, gt97xx->chip->regs[GT_IC_INFO_REG],
+ &ic_id, NULL);
+ if (ret < 0)
+ return ret;
+
+ if (ic_id != gt97xx->chip->id) {
+ dev_err(&client->dev, "chip id mismatch: 0x%x!=0x%llx",
+ gt97xx->chip->id, ic_id);
+ return -1;
+ }
+
+ return 0;
+}
+
+static int gt97xx_init(struct gt97xx *gt97xx)
+{
+ int ret, val;
+
+ ret = gt97xx_identify_module(gt97xx);
+ if (ret < 0)
+ return ret;
+
+ /* Reset PD_CONTROL */
+ ret = cci_write(gt97xx->regmap,
+ gt97xx->chip->regs[GT_RING_PD_CONTROL_REG],
+ GT97XX_PD_MODE_OFF, NULL);
+ if (ret < 0)
+ return ret;
+
+ /* Need waiting delay time after PD reset */
+ fsleep(GT97XX_SLEEP_US);
+
+ /* Enable ACC mode */
+ ret = cci_write(gt97xx->regmap,
+ gt97xx->chip->regs[GT_RING_PD_CONTROL_REG],
+ GT97XX_AAC_MODE_EN, NULL);
+ if (ret < 0)
+ return ret;
+
+ for (val = gt97xx->focus->val % GT97XX_MOVE_STEPS;
+ val <= gt97xx->focus->val; val += GT97XX_MOVE_STEPS) {
+ ret = gt97xx_set_dac(gt97xx, val);
+ if (ret)
+ return ret;
+
+ fsleep(GT97XX_SLEEP_US);
+ }
+
+ return 0;
+}
+
+static int gt97xx_release(struct gt97xx *gt97xx)
+{
+ int ret, val;
+
+ val = round_down(gt97xx->focus->val, GT97XX_MOVE_STEPS);
+ for (; val >= 0; val -= GT97XX_MOVE_STEPS) {
+ ret = gt97xx_set_dac(gt97xx, val);
+ if (ret)
+ return ret;
+
+ fsleep(GT97XX_SLEEP_US);
+ }
+
+ return 0;
+}
+
+static int gt97xx_power_on(struct device *dev)
+{
+ struct v4l2_subdev *sd = dev_get_drvdata(dev);
+ struct gt97xx *gt97xx = sd_to_gt97xx(sd);
+ int ret;
+
+ ret = regulator_bulk_enable(ARRAY_SIZE(gt97xx_supply_names),
+ gt97xx->supplies);
+ if (ret < 0)
+ dev_err(dev, "failed to enable regulators\n");
+
+ return ret;
+}
+
+static int gt97xx_power_off(struct device *dev)
+{
+ struct v4l2_subdev *sd = dev_get_drvdata(dev);
+ struct gt97xx *gt97xx = sd_to_gt97xx(sd);
+ int ret;
+
+ ret = regulator_bulk_disable(ARRAY_SIZE(gt97xx_supply_names),
+ gt97xx->supplies);
+ if (ret < 0)
+ dev_err(dev, "failed to disable regulators\n");
+
+ return ret;
+}
+
+static int gt97xx_runtime_suspend(struct device *dev)
+{
+ struct v4l2_subdev *sd = dev_get_drvdata(dev);
+ struct gt97xx *gt97xx = sd_to_gt97xx(sd);
+
+ gt97xx_release(gt97xx);
+ gt97xx_power_off(dev);
+
+ return 0;
+}
+
+static int gt97xx_runtime_resume(struct device *dev)
+{
+ struct v4l2_subdev *sd = dev_get_drvdata(dev);
+ struct gt97xx *gt97xx = sd_to_gt97xx(sd);
+ int ret;
+
+ ret = gt97xx_power_on(dev);
+ if (ret < 0) {
+ dev_err(dev, "failed to power_on\n");
+ return ret;
+ }
+
+ /* Need waited before sending I2C commands after power-up */
+ fsleep(GT97XX_SLEEP_US);
+
+ ret = gt97xx_init(gt97xx);
+ if (ret < 0)
+ goto disable_power;
+
+ return 0;
+
+disable_power:
+ gt97xx_power_off(dev);
+
+ return ret;
+}
+
+static int gt97xx_set_ctrl(struct v4l2_ctrl *ctrl)
+{
+ struct gt97xx *gt97xx =
+ container_of(ctrl->handler, struct gt97xx, ctrls);
+
+ if (ctrl->id == V4L2_CID_FOCUS_ABSOLUTE)
+ return gt97xx_set_dac(gt97xx, ctrl->val);
+
+ return 0;
+}
+
+static const struct v4l2_ctrl_ops gt97xx_ctrl_ops = {
+ .s_ctrl = gt97xx_set_ctrl,
+};
+
+static int gt97xx_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
+{
+ return pm_runtime_resume_and_get(sd->dev);
+}
+
+static int gt97xx_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
+{
+ return pm_runtime_put(sd->dev);
+}
+
+static const struct v4l2_subdev_internal_ops gt97xx_int_ops = {
+ .open = gt97xx_open,
+ .close = gt97xx_close,
+};
+
+static const struct v4l2_subdev_core_ops gt97xx_core_ops = {
+ .subscribe_event = v4l2_ctrl_subdev_subscribe_event,
+ .unsubscribe_event = v4l2_event_subdev_unsubscribe,
+};
+
+static const struct v4l2_subdev_ops gt97xx_ops = {
+ .core = &gt97xx_core_ops,
+};
+
+static int gt97xx_init_controls(struct gt97xx *gt97xx)
+{
+ struct v4l2_ctrl_handler *hdl = &gt97xx->ctrls;
+ const struct v4l2_ctrl_ops *ops = &gt97xx_ctrl_ops;
+
+ v4l2_ctrl_handler_init(hdl, 1);
+
+ gt97xx->focus = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FOCUS_ABSOLUTE, 0,
+ GT97XX_MAX_FOCUS_POS,
+ 1, 0);
+
+ if (hdl->error)
+ return hdl->error;
+
+ gt97xx->sd.ctrl_handler = hdl;
+
+ return 0;
+}
+
+static int gt97xx_probe(struct i2c_client *client)
+{
+ struct device *dev = &client->dev;
+ struct gt97xx *gt97xx;
+ unsigned int i;
+ int ret;
+
+ gt97xx = devm_kzalloc(dev, sizeof(*gt97xx), GFP_KERNEL);
+ if (!gt97xx)
+ return -ENOMEM;
+
+ gt97xx->regmap = devm_cci_regmap_init_i2c(client, 8);
+ if (IS_ERR(gt97xx->regmap))
+ return dev_err_probe(dev, PTR_ERR(gt97xx->regmap),
+ "failed to init CCI\n");
+
+ /* Initialize subdev */
+ v4l2_i2c_subdev_init(&gt97xx->sd, client, &gt97xx_ops);
+
+ gt97xx->chip = device_get_match_data(dev);
+
+ for (i = 0; i < ARRAY_SIZE(gt97xx_supply_names); i++)
+ gt97xx->supplies[i].supply = gt97xx_supply_names[i];
+
+ ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(gt97xx_supply_names),
+ gt97xx->supplies);
+ if (ret < 0)
+ return dev_err_probe(dev, ret,
+ "failed to get regulators\n");
+
+ /* Initialize controls */
+ ret = gt97xx_init_controls(gt97xx);
+ if (ret)
+ goto err_free_handler;
+
+ /* Initialize subdev */
+ gt97xx->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+ gt97xx->sd.internal_ops = &gt97xx_int_ops;
+ gt97xx->sd.entity.function = MEDIA_ENT_F_LENS;
+
+ ret = media_entity_pads_init(&gt97xx->sd.entity, 0, NULL);
+ if (ret < 0)
+ goto err_free_handler;
+
+ /* Power on and initialize hardware */
+ ret = gt97xx_runtime_resume(dev);
+ if (ret < 0) {
+ dev_err_probe(dev, ret, "failed to power on\n");
+ goto err_clean_entity;
+ }
+
+ pm_runtime_set_active(dev);
+ pm_runtime_enable(dev);
+ pm_runtime_set_autosuspend_delay(dev, 1000);
+ pm_runtime_use_autosuspend(dev);
+ pm_runtime_idle(dev);
+
+ ret = v4l2_async_register_subdev(&gt97xx->sd);
+ if (ret < 0) {
+ dev_err_probe(dev, ret, "failed to register V4L2 subdev\n");
+ goto err_power_off;
+ }
+
+ return 0;
+
+err_power_off:
+ pm_runtime_disable(dev);
+err_clean_entity:
+ media_entity_cleanup(&gt97xx->sd.entity);
+err_free_handler:
+ v4l2_ctrl_handler_free(&gt97xx->ctrls);
+
+ return ret;
+}
+
+static void gt97xx_remove(struct i2c_client *client)
+{
+ struct v4l2_subdev *sd = i2c_get_clientdata(client);
+ struct gt97xx *gt97xx = sd_to_gt97xx(sd);
+
+ v4l2_async_unregister_subdev(&gt97xx->sd);
+ v4l2_ctrl_handler_free(&gt97xx->ctrls);
+ media_entity_cleanup(&gt97xx->sd.entity);
+ pm_runtime_disable(&client->dev);
+ if (!pm_runtime_status_suspended(&client->dev))
+ gt97xx_runtime_suspend(&client->dev);
+ pm_runtime_set_suspended(&client->dev);
+}
+
+static DEFINE_RUNTIME_DEV_PM_OPS(gt97xx_pm_ops,
+ gt97xx_runtime_suspend,
+ gt97xx_runtime_resume,
+ NULL);
+
+static const struct vcm_giantec_of_data gt9768_data = {
+ .id = GT9768_ID,
+ .regs[GT_IC_INFO_REG] = GT97XX_IC_INFO_REG,
+ .regs[GT_RING_PD_CONTROL_REG] = GT97XX_RING_PD_CONTROL_REG,
+ .regs[GT_DAC_ADDR_REG] = GT97XX_DAC_ADDR_REG,
+};
+
+static const struct vcm_giantec_of_data gt9769_data = {
+ .id = GT9769_ID,
+ .regs[GT_IC_INFO_REG] = GT97XX_IC_INFO_REG,
+ .regs[GT_RING_PD_CONTROL_REG] = GT97XX_RING_PD_CONTROL_REG,
+ .regs[GT_DAC_ADDR_REG] = GT97XX_DAC_ADDR_REG,
+};
+
+static const struct of_device_id gt97xx_of_table[] = {
+ { .compatible = "giantec,gt9768", .data = &gt9768_data },
+ { .compatible = "giantec,gt9769", .data = &gt9769_data },
+ {}
+};
+MODULE_DEVICE_TABLE(of, gt97xx_of_table);
+
+static struct i2c_driver gt97xx_i2c_driver = {
+ .driver = {
+ .name = GT97XX_NAME,
+ .pm = pm_ptr(&gt97xx_pm_ops),
+ .of_match_table = gt97xx_of_table,
+ },
+ .probe = gt97xx_probe,
+ .remove = gt97xx_remove,
+};
+module_i2c_driver(gt97xx_i2c_driver);
+
+MODULE_AUTHOR("Zhi Mao <zhi.mao@mediatek.com>");
+MODULE_DESCRIPTION("GT97xx VCM driver");
+MODULE_LICENSE("GPL");
--
2.25.1