--- /dev/null
+/*
+ * 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, ®_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, ®_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, ®_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, ®_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, ®_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");
Code Review / kvmfornfv.git / blobdiff