Initial import

1 files changed, 414 insertions, 0 deletions

diff --git a/drivers/media/i2c/lm3646.c b/drivers/media/i2c/lm3646.c
new file mode 100644
index 000000000..626fb4679
--- /dev/null
+++ b/drivers/media/i2c/lm3646.c
@@ -0,0 +1,414 @@
+/*
+ * drivers/media/i2c/lm3646.c
+ * General device driver for TI lm3646, Dual FLASH LED Driver
+ *
+ * Copyright (C) 2014 Texas Instruments
+ *
+ * Contact: Daniel Jeong <gshark.jeong@gmail.com>
+ *			Ldd-Mlp <ldd-mlp@list.ti.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.
+ */
+
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/regmap.h>
+#include <linux/videodev2.h>
+#include <media/lm3646.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-device.h>
+
+/* registers definitions */
+#define REG_ENABLE		0x01
+#define REG_TORCH_BR	0x05
+#define REG_FLASH_BR	0x05
+#define REG_FLASH_TOUT	0x04
+#define REG_FLAG		0x08
+#define REG_STROBE_SRC	0x06
+#define REG_LED1_FLASH_BR 0x06
+#define REG_LED1_TORCH_BR 0x07
+
+#define MASK_ENABLE		0x03
+#define MASK_TORCH_BR	0x70
+#define MASK_FLASH_BR	0x0F
+#define MASK_FLASH_TOUT	0x07
+#define MASK_FLAG		0xFF
+#define MASK_STROBE_SRC	0x80
+
+/* Fault Mask */
+#define FAULT_TIMEOUT	(1<<0)
+#define FAULT_SHORT_CIRCUIT	(1<<1)
+#define FAULT_UVLO		(1<<2)
+#define FAULT_IVFM		(1<<3)
+#define FAULT_OCP		(1<<4)
+#define FAULT_OVERTEMP	(1<<5)
+#define FAULT_NTC_TRIP	(1<<6)
+#define FAULT_OVP		(1<<7)
+
+enum led_mode {
+	MODE_SHDN = 0x0,
+	MODE_TORCH = 0x2,
+	MODE_FLASH = 0x3,
+};
+
+/*
+ * struct lm3646_flash
+ *
+ * @pdata: platform data
+ * @regmap: reg. map for i2c
+ * @lock: muxtex for serial access.
+ * @led_mode: V4L2 LED mode
+ * @ctrls_led: V4L2 contols
+ * @subdev_led: V4L2 subdev
+ * @mode_reg : mode register value
+ */
+struct lm3646_flash {
+	struct device *dev;
+	struct lm3646_platform_data *pdata;
+	struct regmap *regmap;
+
+	struct v4l2_ctrl_handler ctrls_led;
+	struct v4l2_subdev subdev_led;
+
+	u8 mode_reg;
+};
+
+#define to_lm3646_flash(_ctrl)	\
+	container_of(_ctrl->handler, struct lm3646_flash, ctrls_led)
+
+/* enable mode control */
+static int lm3646_mode_ctrl(struct lm3646_flash *flash,
+			    enum v4l2_flash_led_mode led_mode)
+{
+	switch (led_mode) {
+	case V4L2_FLASH_LED_MODE_NONE:
+		return regmap_write(flash->regmap,
+				    REG_ENABLE, flash->mode_reg | MODE_SHDN);
+	case V4L2_FLASH_LED_MODE_TORCH:
+		return regmap_write(flash->regmap,
+				    REG_ENABLE, flash->mode_reg | MODE_TORCH);
+	case V4L2_FLASH_LED_MODE_FLASH:
+		return regmap_write(flash->regmap,
+				    REG_ENABLE, flash->mode_reg | MODE_FLASH);
+	}
+	return -EINVAL;
+}
+
+/* V4L2 controls  */
+static int lm3646_get_ctrl(struct v4l2_ctrl *ctrl)
+{
+	struct lm3646_flash *flash = to_lm3646_flash(ctrl);
+	unsigned int reg_val;
+	int rval;
+
+	if (ctrl->id != V4L2_CID_FLASH_FAULT)
+		return -EINVAL;
+
+	rval = regmap_read(flash->regmap, REG_FLAG, &reg_val);
+	if (rval < 0)
+		return rval;
+
+	ctrl->val = 0;
+	if (reg_val & FAULT_TIMEOUT)
+		ctrl->val |= V4L2_FLASH_FAULT_TIMEOUT;
+	if (reg_val & FAULT_SHORT_CIRCUIT)
+		ctrl->val |= V4L2_FLASH_FAULT_SHORT_CIRCUIT;
+	if (reg_val & FAULT_UVLO)
+		ctrl->val |= V4L2_FLASH_FAULT_UNDER_VOLTAGE;
+	if (reg_val & FAULT_IVFM)
+		ctrl->val |= V4L2_FLASH_FAULT_INPUT_VOLTAGE;
+	if (reg_val & FAULT_OCP)
+		ctrl->val |= V4L2_FLASH_FAULT_OVER_CURRENT;
+	if (reg_val & FAULT_OVERTEMP)
+		ctrl->val |= V4L2_FLASH_FAULT_OVER_TEMPERATURE;
+	if (reg_val & FAULT_NTC_TRIP)
+		ctrl->val |= V4L2_FLASH_FAULT_LED_OVER_TEMPERATURE;
+	if (reg_val & FAULT_OVP)
+		ctrl->val |= V4L2_FLASH_FAULT_OVER_VOLTAGE;
+
+	return 0;
+}
+
+static int lm3646_set_ctrl(struct v4l2_ctrl *ctrl)
+{
+	struct lm3646_flash *flash = to_lm3646_flash(ctrl);
+	unsigned int reg_val;
+	int rval = -EINVAL;
+
+	switch (ctrl->id) {
+	case V4L2_CID_FLASH_LED_MODE:
+
+		if (ctrl->val != V4L2_FLASH_LED_MODE_FLASH)
+			return lm3646_mode_ctrl(flash, ctrl->val);
+		/* switch to SHDN mode before flash strobe on */
+		return lm3646_mode_ctrl(flash, V4L2_FLASH_LED_MODE_NONE);
+
+	case V4L2_CID_FLASH_STROBE_SOURCE:
+		return regmap_update_bits(flash->regmap,
+					  REG_STROBE_SRC, MASK_STROBE_SRC,
+					  (ctrl->val) << 7);
+
+	case V4L2_CID_FLASH_STROBE:
+
+		/* read and check current mode of chip to start flash */
+		rval = regmap_read(flash->regmap, REG_ENABLE, &reg_val);
+		if (rval < 0 || ((reg_val & MASK_ENABLE) != MODE_SHDN))
+			return rval;
+		/* flash on */
+		return lm3646_mode_ctrl(flash, V4L2_FLASH_LED_MODE_FLASH);
+
+	case V4L2_CID_FLASH_STROBE_STOP:
+
+		/*
+		 * flash mode will be turned automatically
+		 * from FLASH mode to SHDN mode after flash duration timeout
+		 * read and check current mode of chip to stop flash
+		 */
+		rval = regmap_read(flash->regmap, REG_ENABLE, &reg_val);
+		if (rval < 0)
+			return rval;
+		if ((reg_val & MASK_ENABLE) == MODE_FLASH)
+			return lm3646_mode_ctrl(flash,
+						V4L2_FLASH_LED_MODE_NONE);
+		return rval;
+
+	case V4L2_CID_FLASH_TIMEOUT:
+		return regmap_update_bits(flash->regmap,
+					  REG_FLASH_TOUT, MASK_FLASH_TOUT,
+					  LM3646_FLASH_TOUT_ms_TO_REG
+					  (ctrl->val));
+
+	case V4L2_CID_FLASH_INTENSITY:
+		return regmap_update_bits(flash->regmap,
+					  REG_FLASH_BR, MASK_FLASH_BR,
+					  LM3646_TOTAL_FLASH_BRT_uA_TO_REG
+					  (ctrl->val));
+
+	case V4L2_CID_FLASH_TORCH_INTENSITY:
+		return regmap_update_bits(flash->regmap,
+					  REG_TORCH_BR, MASK_TORCH_BR,
+					  LM3646_TOTAL_TORCH_BRT_uA_TO_REG
+					  (ctrl->val) << 4);
+	}
+
+	return -EINVAL;
+}
+
+static const struct v4l2_ctrl_ops lm3646_led_ctrl_ops = {
+	.g_volatile_ctrl = lm3646_get_ctrl,
+	.s_ctrl = lm3646_set_ctrl,
+};
+
+static int lm3646_init_controls(struct lm3646_flash *flash)
+{
+	struct v4l2_ctrl *fault;
+	struct v4l2_ctrl_handler *hdl = &flash->ctrls_led;
+	const struct v4l2_ctrl_ops *ops = &lm3646_led_ctrl_ops;
+
+	v4l2_ctrl_handler_init(hdl, 8);
+	/* flash mode */
+	v4l2_ctrl_new_std_menu(hdl, ops, V4L2_CID_FLASH_LED_MODE,
+			       V4L2_FLASH_LED_MODE_TORCH, ~0x7,
+			       V4L2_FLASH_LED_MODE_NONE);
+
+	/* flash source */
+	v4l2_ctrl_new_std_menu(hdl, ops, V4L2_CID_FLASH_STROBE_SOURCE,
+			       0x1, ~0x3, V4L2_FLASH_STROBE_SOURCE_SOFTWARE);
+
+	/* flash strobe */
+	v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_STROBE, 0, 0, 0, 0);
+	/* flash strobe stop */
+	v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_STROBE_STOP, 0, 0, 0, 0);
+
+	/* flash strobe timeout */
+	v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_TIMEOUT,
+			  LM3646_FLASH_TOUT_MIN,
+			  LM3646_FLASH_TOUT_MAX,
+			  LM3646_FLASH_TOUT_STEP, flash->pdata->flash_timeout);
+
+	/* max flash current */
+	v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_INTENSITY,
+			  LM3646_TOTAL_FLASH_BRT_MIN,
+			  LM3646_TOTAL_FLASH_BRT_MAX,
+			  LM3646_TOTAL_FLASH_BRT_STEP,
+			  LM3646_TOTAL_FLASH_BRT_MAX);
+
+	/* max torch current */
+	v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_TORCH_INTENSITY,
+			  LM3646_TOTAL_TORCH_BRT_MIN,
+			  LM3646_TOTAL_TORCH_BRT_MAX,
+			  LM3646_TOTAL_TORCH_BRT_STEP,
+			  LM3646_TOTAL_TORCH_BRT_MAX);
+
+	/* fault */
+	fault = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_FAULT, 0,
+				  V4L2_FLASH_FAULT_OVER_VOLTAGE
+				  | V4L2_FLASH_FAULT_OVER_TEMPERATURE
+				  | V4L2_FLASH_FAULT_SHORT_CIRCUIT
+				  | V4L2_FLASH_FAULT_TIMEOUT, 0, 0);
+	if (fault != NULL)
+		fault->flags |= V4L2_CTRL_FLAG_VOLATILE;
+
+	if (hdl->error)
+		return hdl->error;
+
+	flash->subdev_led.ctrl_handler = hdl;
+	return 0;
+}
+
+/* initialize device */
+static const struct v4l2_subdev_ops lm3646_ops = {
+	.core = NULL,
+};
+
+static const struct regmap_config lm3646_regmap = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.max_register = 0xFF,
+};
+
+static int lm3646_subdev_init(struct lm3646_flash *flash)
+{
+	struct i2c_client *client = to_i2c_client(flash->dev);
+	int rval;
+
+	v4l2_i2c_subdev_init(&flash->subdev_led, client, &lm3646_ops);
+	flash->subdev_led.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+	strcpy(flash->subdev_led.name, LM3646_NAME);
+	rval = lm3646_init_controls(flash);
+	if (rval)
+		goto err_out;
+	rval = media_entity_init(&flash->subdev_led.entity, 0, NULL, 0);
+	if (rval < 0)
+		goto err_out;
+	flash->subdev_led.entity.type = MEDIA_ENT_T_V4L2_SUBDEV_FLASH;
+	return rval;
+
+err_out:
+	v4l2_ctrl_handler_free(&flash->ctrls_led);
+	return rval;
+}
+
+static int lm3646_init_device(struct lm3646_flash *flash)
+{
+	unsigned int reg_val;
+	int rval;
+
+	/* read the value of mode register to reduce redundant i2c accesses */
+	rval = regmap_read(flash->regmap, REG_ENABLE, &reg_val);
+	if (rval < 0)
+		return rval;
+	flash->mode_reg = reg_val & 0xfc;
+
+	/* output disable */
+	rval = lm3646_mode_ctrl(flash, V4L2_FLASH_LED_MODE_NONE);
+	if (rval < 0)
+		return rval;
+
+	/*
+	 * LED1 flash current setting
+	 * LED2 flash current = Total(Max) flash current - LED1 flash current
+	 */
+	rval = regmap_update_bits(flash->regmap,
+				  REG_LED1_FLASH_BR, 0x7F,
+				  LM3646_LED1_FLASH_BRT_uA_TO_REG
+				  (flash->pdata->led1_flash_brt));
+
+	if (rval < 0)
+		return rval;
+
+	/*
+	 * LED1 torch current setting
+	 * LED2 torch current = Total(Max) torch current - LED1 torch current
+	 */
+	rval = regmap_update_bits(flash->regmap,
+				  REG_LED1_TORCH_BR, 0x7F,
+				  LM3646_LED1_TORCH_BRT_uA_TO_REG
+				  (flash->pdata->led1_torch_brt));
+	if (rval < 0)
+		return rval;
+
+	/* Reset flag register */
+	return regmap_read(flash->regmap, REG_FLAG, &reg_val);
+}
+
+static int lm3646_probe(struct i2c_client *client,
+			const struct i2c_device_id *devid)
+{
+	struct lm3646_flash *flash;
+	struct lm3646_platform_data *pdata = dev_get_platdata(&client->dev);
+	int rval;
+
+	flash = devm_kzalloc(&client->dev, sizeof(*flash), GFP_KERNEL);
+	if (flash == NULL)
+		return -ENOMEM;
+
+	flash->regmap = devm_regmap_init_i2c(client, &lm3646_regmap);
+	if (IS_ERR(flash->regmap))
+		return PTR_ERR(flash->regmap);
+
+	/* check device tree if there is no platform data */
+	if (pdata == NULL) {
+		pdata = devm_kzalloc(&client->dev,
+				     sizeof(struct lm3646_platform_data),
+				     GFP_KERNEL);
+		if (pdata == NULL)
+			return -ENOMEM;
+		/* use default data in case of no platform data */
+		pdata->flash_timeout = LM3646_FLASH_TOUT_MAX;
+		pdata->led1_torch_brt = LM3646_LED1_TORCH_BRT_MAX;
+		pdata->led1_flash_brt = LM3646_LED1_FLASH_BRT_MAX;
+	}
+	flash->pdata = pdata;
+	flash->dev = &client->dev;
+
+	rval = lm3646_subdev_init(flash);
+	if (rval < 0)
+		return rval;
+
+	rval = lm3646_init_device(flash);
+	if (rval < 0)
+		return rval;
+
+	i2c_set_clientdata(client, flash);
+
+	return 0;
+}
+
+static int lm3646_remove(struct i2c_client *client)
+{
+	struct lm3646_flash *flash = i2c_get_clientdata(client);
+
+	v4l2_device_unregister_subdev(&flash->subdev_led);
+	v4l2_ctrl_handler_free(&flash->ctrls_led);
+	media_entity_cleanup(&flash->subdev_led.entity);
+
+	return 0;
+}
+
+static const struct i2c_device_id lm3646_id_table[] = {
+	{LM3646_NAME, 0},
+	{}
+};
+
+MODULE_DEVICE_TABLE(i2c, lm3646_id_table);
+
+static struct i2c_driver lm3646_i2c_driver = {
+	.driver = {
+		   .name = LM3646_NAME,
+		   },
+	.probe = lm3646_probe,
+	.remove = lm3646_remove,
+	.id_table = lm3646_id_table,
+};
+
+module_i2c_driver(lm3646_i2c_driver);
+
+MODULE_AUTHOR("Daniel Jeong <gshark.jeong@gmail.com>");
+MODULE_AUTHOR("Ldd Mlp <ldd-mlp@list.ti.com>");
+MODULE_DESCRIPTION("Texas Instruments LM3646 Dual Flash LED driver");
+MODULE_LICENSE("GPL");