410 lines
10 KiB
C
410 lines
10 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* drivers/media/i2c/lm3646.c
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* General device driver for TI lm3646, Dual FLASH LED Driver
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*
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* Copyright (C) 2014 Texas Instruments
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*
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* Contact: Daniel Jeong <gshark.jeong@gmail.com>
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* Ldd-Mlp <ldd-mlp@list.ti.com>
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*/
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#include <linux/delay.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/regmap.h>
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#include <linux/videodev2.h>
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#include <media/i2c/lm3646.h>
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#include <media/v4l2-ctrls.h>
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#include <media/v4l2-device.h>
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/* registers definitions */
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#define REG_ENABLE 0x01
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#define REG_TORCH_BR 0x05
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#define REG_FLASH_BR 0x05
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#define REG_FLASH_TOUT 0x04
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#define REG_FLAG 0x08
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#define REG_STROBE_SRC 0x06
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#define REG_LED1_FLASH_BR 0x06
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#define REG_LED1_TORCH_BR 0x07
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#define MASK_ENABLE 0x03
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#define MASK_TORCH_BR 0x70
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#define MASK_FLASH_BR 0x0F
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#define MASK_FLASH_TOUT 0x07
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#define MASK_FLAG 0xFF
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#define MASK_STROBE_SRC 0x80
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/* Fault Mask */
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#define FAULT_TIMEOUT (1<<0)
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#define FAULT_SHORT_CIRCUIT (1<<1)
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#define FAULT_UVLO (1<<2)
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#define FAULT_IVFM (1<<3)
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#define FAULT_OCP (1<<4)
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#define FAULT_OVERTEMP (1<<5)
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#define FAULT_NTC_TRIP (1<<6)
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#define FAULT_OVP (1<<7)
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enum led_mode {
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MODE_SHDN = 0x0,
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MODE_TORCH = 0x2,
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MODE_FLASH = 0x3,
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};
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/*
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* struct lm3646_flash
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*
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* @pdata: platform data
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* @regmap: reg. map for i2c
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* @lock: muxtex for serial access.
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* @led_mode: V4L2 LED mode
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* @ctrls_led: V4L2 controls
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* @subdev_led: V4L2 subdev
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* @mode_reg : mode register value
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*/
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struct lm3646_flash {
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struct device *dev;
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struct lm3646_platform_data *pdata;
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struct regmap *regmap;
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struct v4l2_ctrl_handler ctrls_led;
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struct v4l2_subdev subdev_led;
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u8 mode_reg;
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};
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#define to_lm3646_flash(_ctrl) \
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container_of(_ctrl->handler, struct lm3646_flash, ctrls_led)
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/* enable mode control */
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static int lm3646_mode_ctrl(struct lm3646_flash *flash,
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enum v4l2_flash_led_mode led_mode)
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{
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switch (led_mode) {
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case V4L2_FLASH_LED_MODE_NONE:
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return regmap_write(flash->regmap,
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REG_ENABLE, flash->mode_reg | MODE_SHDN);
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case V4L2_FLASH_LED_MODE_TORCH:
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return regmap_write(flash->regmap,
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REG_ENABLE, flash->mode_reg | MODE_TORCH);
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case V4L2_FLASH_LED_MODE_FLASH:
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return regmap_write(flash->regmap,
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REG_ENABLE, flash->mode_reg | MODE_FLASH);
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}
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return -EINVAL;
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}
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/* V4L2 controls */
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static int lm3646_get_ctrl(struct v4l2_ctrl *ctrl)
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{
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struct lm3646_flash *flash = to_lm3646_flash(ctrl);
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unsigned int reg_val;
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int rval;
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if (ctrl->id != V4L2_CID_FLASH_FAULT)
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return -EINVAL;
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rval = regmap_read(flash->regmap, REG_FLAG, ®_val);
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if (rval < 0)
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return rval;
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ctrl->val = 0;
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if (reg_val & FAULT_TIMEOUT)
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ctrl->val |= V4L2_FLASH_FAULT_TIMEOUT;
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if (reg_val & FAULT_SHORT_CIRCUIT)
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ctrl->val |= V4L2_FLASH_FAULT_SHORT_CIRCUIT;
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if (reg_val & FAULT_UVLO)
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ctrl->val |= V4L2_FLASH_FAULT_UNDER_VOLTAGE;
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if (reg_val & FAULT_IVFM)
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ctrl->val |= V4L2_FLASH_FAULT_INPUT_VOLTAGE;
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if (reg_val & FAULT_OCP)
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ctrl->val |= V4L2_FLASH_FAULT_OVER_CURRENT;
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if (reg_val & FAULT_OVERTEMP)
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ctrl->val |= V4L2_FLASH_FAULT_OVER_TEMPERATURE;
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if (reg_val & FAULT_NTC_TRIP)
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ctrl->val |= V4L2_FLASH_FAULT_LED_OVER_TEMPERATURE;
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if (reg_val & FAULT_OVP)
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ctrl->val |= V4L2_FLASH_FAULT_OVER_VOLTAGE;
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return 0;
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}
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static int lm3646_set_ctrl(struct v4l2_ctrl *ctrl)
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{
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struct lm3646_flash *flash = to_lm3646_flash(ctrl);
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unsigned int reg_val;
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int rval;
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switch (ctrl->id) {
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case V4L2_CID_FLASH_LED_MODE:
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if (ctrl->val != V4L2_FLASH_LED_MODE_FLASH)
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return lm3646_mode_ctrl(flash, ctrl->val);
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/* switch to SHDN mode before flash strobe on */
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return lm3646_mode_ctrl(flash, V4L2_FLASH_LED_MODE_NONE);
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case V4L2_CID_FLASH_STROBE_SOURCE:
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return regmap_update_bits(flash->regmap,
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REG_STROBE_SRC, MASK_STROBE_SRC,
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(ctrl->val) << 7);
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case V4L2_CID_FLASH_STROBE:
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/* read and check current mode of chip to start flash */
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rval = regmap_read(flash->regmap, REG_ENABLE, ®_val);
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if (rval < 0 || ((reg_val & MASK_ENABLE) != MODE_SHDN))
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return rval;
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/* flash on */
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return lm3646_mode_ctrl(flash, V4L2_FLASH_LED_MODE_FLASH);
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case V4L2_CID_FLASH_STROBE_STOP:
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/*
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* flash mode will be turned automatically
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* from FLASH mode to SHDN mode after flash duration timeout
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* read and check current mode of chip to stop flash
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*/
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rval = regmap_read(flash->regmap, REG_ENABLE, ®_val);
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if (rval < 0)
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return rval;
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if ((reg_val & MASK_ENABLE) == MODE_FLASH)
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return lm3646_mode_ctrl(flash,
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V4L2_FLASH_LED_MODE_NONE);
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return rval;
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case V4L2_CID_FLASH_TIMEOUT:
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return regmap_update_bits(flash->regmap,
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REG_FLASH_TOUT, MASK_FLASH_TOUT,
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LM3646_FLASH_TOUT_ms_TO_REG
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(ctrl->val));
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case V4L2_CID_FLASH_INTENSITY:
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return regmap_update_bits(flash->regmap,
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REG_FLASH_BR, MASK_FLASH_BR,
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LM3646_TOTAL_FLASH_BRT_uA_TO_REG
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(ctrl->val));
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case V4L2_CID_FLASH_TORCH_INTENSITY:
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return regmap_update_bits(flash->regmap,
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REG_TORCH_BR, MASK_TORCH_BR,
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LM3646_TOTAL_TORCH_BRT_uA_TO_REG
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(ctrl->val) << 4);
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}
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return -EINVAL;
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}
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static const struct v4l2_ctrl_ops lm3646_led_ctrl_ops = {
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.g_volatile_ctrl = lm3646_get_ctrl,
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.s_ctrl = lm3646_set_ctrl,
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};
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static int lm3646_init_controls(struct lm3646_flash *flash)
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{
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struct v4l2_ctrl *fault;
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struct v4l2_ctrl_handler *hdl = &flash->ctrls_led;
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const struct v4l2_ctrl_ops *ops = &lm3646_led_ctrl_ops;
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v4l2_ctrl_handler_init(hdl, 8);
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/* flash mode */
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v4l2_ctrl_new_std_menu(hdl, ops, V4L2_CID_FLASH_LED_MODE,
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V4L2_FLASH_LED_MODE_TORCH, ~0x7,
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V4L2_FLASH_LED_MODE_NONE);
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/* flash source */
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v4l2_ctrl_new_std_menu(hdl, ops, V4L2_CID_FLASH_STROBE_SOURCE,
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0x1, ~0x3, V4L2_FLASH_STROBE_SOURCE_SOFTWARE);
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/* flash strobe */
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v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_STROBE, 0, 0, 0, 0);
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/* flash strobe stop */
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v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_STROBE_STOP, 0, 0, 0, 0);
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/* flash strobe timeout */
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v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_TIMEOUT,
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LM3646_FLASH_TOUT_MIN,
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LM3646_FLASH_TOUT_MAX,
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LM3646_FLASH_TOUT_STEP, flash->pdata->flash_timeout);
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/* max flash current */
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v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_INTENSITY,
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LM3646_TOTAL_FLASH_BRT_MIN,
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LM3646_TOTAL_FLASH_BRT_MAX,
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LM3646_TOTAL_FLASH_BRT_STEP,
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LM3646_TOTAL_FLASH_BRT_MAX);
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/* max torch current */
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v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_TORCH_INTENSITY,
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LM3646_TOTAL_TORCH_BRT_MIN,
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LM3646_TOTAL_TORCH_BRT_MAX,
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LM3646_TOTAL_TORCH_BRT_STEP,
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LM3646_TOTAL_TORCH_BRT_MAX);
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/* fault */
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fault = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_FAULT, 0,
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V4L2_FLASH_FAULT_OVER_VOLTAGE
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| V4L2_FLASH_FAULT_OVER_TEMPERATURE
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| V4L2_FLASH_FAULT_SHORT_CIRCUIT
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| V4L2_FLASH_FAULT_TIMEOUT, 0, 0);
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if (fault != NULL)
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fault->flags |= V4L2_CTRL_FLAG_VOLATILE;
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if (hdl->error)
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return hdl->error;
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flash->subdev_led.ctrl_handler = hdl;
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return 0;
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}
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/* initialize device */
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static const struct v4l2_subdev_ops lm3646_ops = {
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.core = NULL,
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};
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static const struct regmap_config lm3646_regmap = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = 0xFF,
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};
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static int lm3646_subdev_init(struct lm3646_flash *flash)
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{
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struct i2c_client *client = to_i2c_client(flash->dev);
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int rval;
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v4l2_i2c_subdev_init(&flash->subdev_led, client, &lm3646_ops);
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flash->subdev_led.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
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strscpy(flash->subdev_led.name, LM3646_NAME,
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sizeof(flash->subdev_led.name));
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rval = lm3646_init_controls(flash);
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if (rval)
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goto err_out;
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rval = media_entity_pads_init(&flash->subdev_led.entity, 0, NULL);
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if (rval < 0)
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goto err_out;
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flash->subdev_led.entity.function = MEDIA_ENT_F_FLASH;
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return rval;
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err_out:
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v4l2_ctrl_handler_free(&flash->ctrls_led);
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return rval;
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}
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static int lm3646_init_device(struct lm3646_flash *flash)
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{
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unsigned int reg_val;
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int rval;
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/* read the value of mode register to reduce redundant i2c accesses */
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rval = regmap_read(flash->regmap, REG_ENABLE, ®_val);
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if (rval < 0)
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return rval;
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flash->mode_reg = reg_val & 0xfc;
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/* output disable */
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rval = lm3646_mode_ctrl(flash, V4L2_FLASH_LED_MODE_NONE);
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if (rval < 0)
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return rval;
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/*
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* LED1 flash current setting
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* LED2 flash current = Total(Max) flash current - LED1 flash current
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*/
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rval = regmap_update_bits(flash->regmap,
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REG_LED1_FLASH_BR, 0x7F,
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LM3646_LED1_FLASH_BRT_uA_TO_REG
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(flash->pdata->led1_flash_brt));
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if (rval < 0)
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return rval;
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/*
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* LED1 torch current setting
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* LED2 torch current = Total(Max) torch current - LED1 torch current
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*/
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rval = regmap_update_bits(flash->regmap,
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REG_LED1_TORCH_BR, 0x7F,
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LM3646_LED1_TORCH_BRT_uA_TO_REG
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(flash->pdata->led1_torch_brt));
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if (rval < 0)
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return rval;
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/* Reset flag register */
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return regmap_read(flash->regmap, REG_FLAG, ®_val);
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}
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static int lm3646_probe(struct i2c_client *client)
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{
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struct lm3646_flash *flash;
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struct lm3646_platform_data *pdata = dev_get_platdata(&client->dev);
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int rval;
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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 void 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);
|
||
|
|
}
|
||
|
|
|
||
|
|
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_new = 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");
|