482 lines
12 KiB
C
482 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* drivers/media/i2c/lm3560.c
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* General device driver for TI lm3559, lm3560, FLASH LED Driver
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*
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* Copyright (C) 2013 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/module.h>
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#include <linux/i2c.h>
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#include <linux/slab.h>
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#include <linux/mutex.h>
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#include <linux/regmap.h>
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#include <linux/videodev2.h>
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#include <media/i2c/lm3560.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 0x10
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#define REG_TORCH_BR 0xa0
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#define REG_FLASH_BR 0xb0
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#define REG_FLASH_TOUT 0xc0
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#define REG_FLAG 0xd0
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#define REG_CONFIG1 0xe0
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/* fault mask */
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#define FAULT_TIMEOUT (1<<0)
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#define FAULT_OVERTEMP (1<<1)
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#define FAULT_SHORT_CIRCUIT (1<<2)
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enum led_enable {
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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 lm3560_flash
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*
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* @dev: pointer to &struct device
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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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*/
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struct lm3560_flash {
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struct device *dev;
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struct lm3560_platform_data *pdata;
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struct regmap *regmap;
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struct mutex lock;
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enum v4l2_flash_led_mode led_mode;
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struct v4l2_ctrl_handler ctrls_led[LM3560_LED_MAX];
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struct v4l2_subdev subdev_led[LM3560_LED_MAX];
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};
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#define to_lm3560_flash(_ctrl, _no) \
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container_of(_ctrl->handler, struct lm3560_flash, ctrls_led[_no])
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/* enable mode control */
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static int lm3560_mode_ctrl(struct lm3560_flash *flash)
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{
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int rval = -EINVAL;
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switch (flash->led_mode) {
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case V4L2_FLASH_LED_MODE_NONE:
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rval = regmap_update_bits(flash->regmap,
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REG_ENABLE, 0x03, MODE_SHDN);
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break;
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case V4L2_FLASH_LED_MODE_TORCH:
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rval = regmap_update_bits(flash->regmap,
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REG_ENABLE, 0x03, MODE_TORCH);
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break;
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case V4L2_FLASH_LED_MODE_FLASH:
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rval = regmap_update_bits(flash->regmap,
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REG_ENABLE, 0x03, MODE_FLASH);
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break;
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}
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return rval;
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}
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/* led1/2 enable/disable */
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static int lm3560_enable_ctrl(struct lm3560_flash *flash,
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enum lm3560_led_id led_no, bool on)
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{
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int rval;
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if (led_no == LM3560_LED0) {
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if (on)
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rval = regmap_update_bits(flash->regmap,
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REG_ENABLE, 0x08, 0x08);
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else
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rval = regmap_update_bits(flash->regmap,
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REG_ENABLE, 0x08, 0x00);
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} else {
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if (on)
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rval = regmap_update_bits(flash->regmap,
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REG_ENABLE, 0x10, 0x10);
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else
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rval = regmap_update_bits(flash->regmap,
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REG_ENABLE, 0x10, 0x00);
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}
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return rval;
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}
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/* torch1/2 brightness control */
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static int lm3560_torch_brt_ctrl(struct lm3560_flash *flash,
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enum lm3560_led_id led_no, unsigned int brt)
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{
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int rval;
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u8 br_bits;
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if (brt < LM3560_TORCH_BRT_MIN)
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return lm3560_enable_ctrl(flash, led_no, false);
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else
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rval = lm3560_enable_ctrl(flash, led_no, true);
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br_bits = LM3560_TORCH_BRT_uA_TO_REG(brt);
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if (led_no == LM3560_LED0)
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rval = regmap_update_bits(flash->regmap,
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REG_TORCH_BR, 0x07, br_bits);
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else
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rval = regmap_update_bits(flash->regmap,
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REG_TORCH_BR, 0x38, br_bits << 3);
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return rval;
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}
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/* flash1/2 brightness control */
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static int lm3560_flash_brt_ctrl(struct lm3560_flash *flash,
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enum lm3560_led_id led_no, unsigned int brt)
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{
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int rval;
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u8 br_bits;
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if (brt < LM3560_FLASH_BRT_MIN)
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return lm3560_enable_ctrl(flash, led_no, false);
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else
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rval = lm3560_enable_ctrl(flash, led_no, true);
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br_bits = LM3560_FLASH_BRT_uA_TO_REG(brt);
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if (led_no == LM3560_LED0)
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rval = regmap_update_bits(flash->regmap,
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REG_FLASH_BR, 0x0f, br_bits);
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else
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rval = regmap_update_bits(flash->regmap,
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REG_FLASH_BR, 0xf0, br_bits << 4);
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return rval;
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}
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/* v4l2 controls */
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static int lm3560_get_ctrl(struct v4l2_ctrl *ctrl, enum lm3560_led_id led_no)
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{
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struct lm3560_flash *flash = to_lm3560_flash(ctrl, led_no);
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int rval = -EINVAL;
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mutex_lock(&flash->lock);
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if (ctrl->id == V4L2_CID_FLASH_FAULT) {
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s32 fault = 0;
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unsigned int reg_val;
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rval = regmap_read(flash->regmap, REG_FLAG, ®_val);
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if (rval < 0)
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goto out;
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if (reg_val & FAULT_SHORT_CIRCUIT)
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fault |= V4L2_FLASH_FAULT_SHORT_CIRCUIT;
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if (reg_val & FAULT_OVERTEMP)
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fault |= V4L2_FLASH_FAULT_OVER_TEMPERATURE;
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if (reg_val & FAULT_TIMEOUT)
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fault |= V4L2_FLASH_FAULT_TIMEOUT;
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ctrl->cur.val = fault;
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}
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out:
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mutex_unlock(&flash->lock);
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return rval;
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}
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static int lm3560_set_ctrl(struct v4l2_ctrl *ctrl, enum lm3560_led_id led_no)
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{
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struct lm3560_flash *flash = to_lm3560_flash(ctrl, led_no);
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u8 tout_bits;
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int rval = -EINVAL;
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mutex_lock(&flash->lock);
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switch (ctrl->id) {
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case V4L2_CID_FLASH_LED_MODE:
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flash->led_mode = ctrl->val;
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if (flash->led_mode != V4L2_FLASH_LED_MODE_FLASH)
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rval = lm3560_mode_ctrl(flash);
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break;
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case V4L2_CID_FLASH_STROBE_SOURCE:
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rval = regmap_update_bits(flash->regmap,
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REG_CONFIG1, 0x04, (ctrl->val) << 2);
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if (rval < 0)
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goto err_out;
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break;
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case V4L2_CID_FLASH_STROBE:
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if (flash->led_mode != V4L2_FLASH_LED_MODE_FLASH) {
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rval = -EBUSY;
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goto err_out;
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}
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flash->led_mode = V4L2_FLASH_LED_MODE_FLASH;
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rval = lm3560_mode_ctrl(flash);
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break;
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case V4L2_CID_FLASH_STROBE_STOP:
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if (flash->led_mode != V4L2_FLASH_LED_MODE_FLASH) {
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rval = -EBUSY;
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goto err_out;
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}
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flash->led_mode = V4L2_FLASH_LED_MODE_NONE;
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rval = lm3560_mode_ctrl(flash);
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break;
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case V4L2_CID_FLASH_TIMEOUT:
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tout_bits = LM3560_FLASH_TOUT_ms_TO_REG(ctrl->val);
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rval = regmap_update_bits(flash->regmap,
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REG_FLASH_TOUT, 0x1f, tout_bits);
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break;
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case V4L2_CID_FLASH_INTENSITY:
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rval = lm3560_flash_brt_ctrl(flash, led_no, ctrl->val);
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break;
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case V4L2_CID_FLASH_TORCH_INTENSITY:
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rval = lm3560_torch_brt_ctrl(flash, led_no, ctrl->val);
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break;
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}
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err_out:
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mutex_unlock(&flash->lock);
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return rval;
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}
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static int lm3560_led1_get_ctrl(struct v4l2_ctrl *ctrl)
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{
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return lm3560_get_ctrl(ctrl, LM3560_LED1);
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}
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static int lm3560_led1_set_ctrl(struct v4l2_ctrl *ctrl)
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{
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return lm3560_set_ctrl(ctrl, LM3560_LED1);
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}
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static int lm3560_led0_get_ctrl(struct v4l2_ctrl *ctrl)
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{
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return lm3560_get_ctrl(ctrl, LM3560_LED0);
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}
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static int lm3560_led0_set_ctrl(struct v4l2_ctrl *ctrl)
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{
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return lm3560_set_ctrl(ctrl, LM3560_LED0);
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}
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static const struct v4l2_ctrl_ops lm3560_led_ctrl_ops[LM3560_LED_MAX] = {
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[LM3560_LED0] = {
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.g_volatile_ctrl = lm3560_led0_get_ctrl,
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.s_ctrl = lm3560_led0_set_ctrl,
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},
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[LM3560_LED1] = {
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.g_volatile_ctrl = lm3560_led1_get_ctrl,
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.s_ctrl = lm3560_led1_set_ctrl,
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}
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};
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static int lm3560_init_controls(struct lm3560_flash *flash,
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enum lm3560_led_id led_no)
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{
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struct v4l2_ctrl *fault;
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u32 max_flash_brt = flash->pdata->max_flash_brt[led_no];
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u32 max_torch_brt = flash->pdata->max_torch_brt[led_no];
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struct v4l2_ctrl_handler *hdl = &flash->ctrls_led[led_no];
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const struct v4l2_ctrl_ops *ops = &lm3560_led_ctrl_ops[led_no];
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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->led_mode = 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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LM3560_FLASH_TOUT_MIN,
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flash->pdata->max_flash_timeout,
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LM3560_FLASH_TOUT_STEP,
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flash->pdata->max_flash_timeout);
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/* flash brt */
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v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_INTENSITY,
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LM3560_FLASH_BRT_MIN, max_flash_brt,
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LM3560_FLASH_BRT_STEP, max_flash_brt);
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/* torch brt */
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v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_TORCH_INTENSITY,
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LM3560_TORCH_BRT_MIN, max_torch_brt,
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LM3560_TORCH_BRT_STEP, max_torch_brt);
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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[led_no].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 lm3560_ops = {
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.core = NULL,
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};
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static const struct regmap_config lm3560_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 lm3560_subdev_init(struct lm3560_flash *flash,
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enum lm3560_led_id led_no, char *led_name)
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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[led_no], client, &lm3560_ops);
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flash->subdev_led[led_no].flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
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strscpy(flash->subdev_led[led_no].name, led_name,
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sizeof(flash->subdev_led[led_no].name));
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rval = lm3560_init_controls(flash, led_no);
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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[led_no].entity, 0, NULL);
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if (rval < 0)
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goto err_out;
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flash->subdev_led[led_no].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[led_no]);
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return rval;
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}
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static int lm3560_init_device(struct lm3560_flash *flash)
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{
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int rval;
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unsigned int reg_val;
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/* set peak current */
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rval = regmap_update_bits(flash->regmap,
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REG_FLASH_TOUT, 0x60, flash->pdata->peak);
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if (rval < 0)
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return rval;
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/* output disable */
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flash->led_mode = V4L2_FLASH_LED_MODE_NONE;
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rval = lm3560_mode_ctrl(flash);
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if (rval < 0)
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return rval;
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/* reset faults */
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rval = regmap_read(flash->regmap, REG_FLAG, ®_val);
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return rval;
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}
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static int lm3560_probe(struct i2c_client *client,
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const struct i2c_device_id *devid)
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{
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struct lm3560_flash *flash;
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struct lm3560_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);
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if (flash == NULL)
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return -ENOMEM;
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flash->regmap = devm_regmap_init_i2c(client, &lm3560_regmap);
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if (IS_ERR(flash->regmap)) {
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rval = PTR_ERR(flash->regmap);
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return rval;
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}
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/* if there is no platform data, use chip default value */
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if (pdata == NULL) {
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pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL);
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if (pdata == NULL)
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return -ENODEV;
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pdata->peak = LM3560_PEAK_3600mA;
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pdata->max_flash_timeout = LM3560_FLASH_TOUT_MAX;
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/* led 1 */
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pdata->max_flash_brt[LM3560_LED0] = LM3560_FLASH_BRT_MAX;
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pdata->max_torch_brt[LM3560_LED0] = LM3560_TORCH_BRT_MAX;
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/* led 2 */
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pdata->max_flash_brt[LM3560_LED1] = LM3560_FLASH_BRT_MAX;
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pdata->max_torch_brt[LM3560_LED1] = LM3560_TORCH_BRT_MAX;
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}
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flash->pdata = pdata;
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flash->dev = &client->dev;
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mutex_init(&flash->lock);
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rval = lm3560_subdev_init(flash, LM3560_LED0, "lm3560-led0");
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if (rval < 0)
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return rval;
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rval = lm3560_subdev_init(flash, LM3560_LED1, "lm3560-led1");
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if (rval < 0)
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return rval;
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rval = lm3560_init_device(flash);
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if (rval < 0)
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return rval;
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i2c_set_clientdata(client, flash);
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return 0;
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}
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static void lm3560_remove(struct i2c_client *client)
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{
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struct lm3560_flash *flash = i2c_get_clientdata(client);
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unsigned int i;
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for (i = LM3560_LED0; i < LM3560_LED_MAX; i++) {
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v4l2_device_unregister_subdev(&flash->subdev_led[i]);
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v4l2_ctrl_handler_free(&flash->ctrls_led[i]);
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media_entity_cleanup(&flash->subdev_led[i].entity);
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}
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}
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static const struct i2c_device_id lm3560_id_table[] = {
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{LM3559_NAME, 0},
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{LM3560_NAME, 0},
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{}
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};
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MODULE_DEVICE_TABLE(i2c, lm3560_id_table);
|
|
|
|
static struct i2c_driver lm3560_i2c_driver = {
|
|
.driver = {
|
|
.name = LM3560_NAME,
|
|
.pm = NULL,
|
|
},
|
|
.probe = lm3560_probe,
|
|
.remove = lm3560_remove,
|
|
.id_table = lm3560_id_table,
|
|
};
|
|
|
|
module_i2c_driver(lm3560_i2c_driver);
|
|
|
|
MODULE_AUTHOR("Daniel Jeong <gshark.jeong@gmail.com>");
|
|
MODULE_AUTHOR("Ldd Mlp <ldd-mlp@list.ti.com>");
|
|
MODULE_DESCRIPTION("Texas Instruments LM3560 LED flash driver");
|
|
MODULE_LICENSE("GPL");
|