| Message ID | 1392613501-14778-1-git-send-email-gshark.jeong@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Hi Daniel, On Mon, Feb 17, 2014 at 02:05:01PM +0900, Daniel Jeong wrote: > harware description check priorities > platform data -> device tree -> default data > > Signed-off-by: Daniel Jeong <gshark.jeong@gmail.com> > --- > drivers/media/i2c/Kconfig | 9 + > drivers/media/i2c/Makefile | 1 + > drivers/media/i2c/lm3646.c | 456 ++++++++++++++++++++++++++++++++++++++++++++ > include/media/lm3646.h | 87 +++++++++ > 4 files changed, 553 insertions(+) > create mode 100644 drivers/media/i2c/lm3646.c > create mode 100644 include/media/lm3646.h > > diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig > index 4aa9c53..c7f2823 100644 > --- a/drivers/media/i2c/Kconfig > +++ b/drivers/media/i2c/Kconfig > @@ -629,6 +629,15 @@ config VIDEO_LM3560 > This is a driver for the lm3560 dual flash controllers. It controls > flash, torch LEDs. > > +config VIDEO_LM3646 > + tristate "LM3646 dual flash driver support" > + depends on I2C && VIDEO_V4L2 && MEDIA_CONTROLLER > + depends on MEDIA_CAMERA_SUPPORT > + select REGMAP_I2C > + ---help--- > + This is a driver for the lm3646 dual flash controllers. It controls > + flash, torch LEDs. > + > comment "Video improvement chips" > > config VIDEO_UPD64031A > diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile > index 48888ae..01b6bfc 100644 > --- a/drivers/media/i2c/Makefile > +++ b/drivers/media/i2c/Makefile > @@ -72,6 +72,7 @@ obj-$(CONFIG_VIDEO_S5C73M3) += s5c73m3/ > obj-$(CONFIG_VIDEO_ADP1653) += adp1653.o > obj-$(CONFIG_VIDEO_AS3645A) += as3645a.o > obj-$(CONFIG_VIDEO_LM3560) += lm3560.o > +obj-$(CONFIG_VIDEO_LM3646) += lm3646.o > obj-$(CONFIG_VIDEO_SMIAPP_PLL) += smiapp-pll.o > obj-$(CONFIG_VIDEO_AK881X) += ak881x.o > obj-$(CONFIG_VIDEO_IR_I2C) += ir-kbd-i2c.o > diff --git a/drivers/media/i2c/lm3646.c b/drivers/media/i2c/lm3646.c > new file mode 100644 > index 0000000..acf5961 > --- /dev/null > +++ b/drivers/media/i2c/lm3646.c > @@ -0,0 +1,456 @@ > +/* > + * 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/module.h> > +#include <linux/i2c.h> > +#include <linux/slab.h> > +#include <linux/regmap.h> Could you order the headers alphabetically? > +#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 > + */ > +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; > +}; > + > +#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) > +{ > + int rval = -EINVAL; > + > + switch (led_mode) { > + case V4L2_FLASH_LED_MODE_NONE: > + rval = regmap_update_bits(flash->regmap, > + REG_ENABLE, MASK_ENABLE, MODE_SHDN); regmap_update_bits() without caching will read the register over the i2c bus. But you already knew the value of that register. I2c is quite slow and extra accesses should be avoided, especially when strobing the flash. There are a few options here - If there are no other configurations in the register just write zeros elsewhere. - Use regmap to cache these values, but not caching the fault register. - Get the rest of the configuration from somewhere else. This shouldn't be a problem since all the configuration is either controls or static (platform/OF) data. > + break; > + case V4L2_FLASH_LED_MODE_TORCH: > + rval = regmap_update_bits(flash->regmap, > + REG_ENABLE, MASK_ENABLE, MODE_TORCH); > + break; > + case V4L2_FLASH_LED_MODE_FLASH: > + rval = regmap_update_bits(flash->regmap, > + REG_ENABLE, MASK_ENABLE, MODE_FLASH); > + break; > + } > + return rval; > +} > + > +/* V4L2 controls */ > +static int lm3646_get_ctrl(struct v4l2_ctrl *ctrl) > +{ > + struct lm3646_flash *flash = to_lm3646_flash(ctrl); > + int rval = -EINVAL; > + > + if (ctrl->id == V4L2_CID_FLASH_FAULT) { > + s32 fault = 0; > + unsigned int reg_val; > + rval = regmap_read(flash->regmap, REG_FLAG, ®_val); > + if (rval < 0) > + return rval; > + > + if (reg_val & FAULT_TIMEOUT) > + fault |= V4L2_FLASH_FAULT_TIMEOUT; > + if (reg_val & FAULT_SHORT_CIRCUIT) > + fault |= V4L2_FLASH_FAULT_SHORT_CIRCUIT; > + if (reg_val & FAULT_UVLO) > + fault |= V4L2_FLASH_FAULT_UNDER_VOLTAGE; > + if (reg_val & FAULT_IVFM) > + fault |= V4L2_FLASH_FAULT_INPUT_VOLTAGE; > + if (reg_val & FAULT_OCP) > + fault |= V4L2_FLASH_FAULT_OVER_CURRENT; > + if (reg_val & FAULT_OVERTEMP) > + fault |= V4L2_FLASH_FAULT_OVER_TEMPERATURE; > + if (reg_val & FAULT_NTC_TRIP) > + fault |= V4L2_FLASH_FAULT_LED_OVER_TEMPERATURE; > + if (reg_val & FAULT_OVP) > + fault |= V4L2_FLASH_FAULT_OVER_VOLTAGE; > + > + ctrl->val = fault; > + } > + > + return rval; > +} > + > +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: > + reg_val = LM3646_TOTAL_TORCH_BRT_uA_TO_REG(ctrl->val); > + 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; > + > + /* 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 */ > + rval = regmap_read(flash->regmap, REG_FLAG, ®_val); > + return rval; You can return w/o assignment to rval. > +} > + > +#ifdef CONFIG_OF > + > +static void lm3646_parse_dt(struct i2c_client *client, > + struct lm3646_platform_data *pdata) > +{ > + struct device_node *node = client->dev.of_node; > + > + if (of_property_read_u32(node, > + "flash_timeout", &pdata->flash_timeout)) { > + dev_err(&client->dev, "flash time out not specified\n"); > + pdata->flash_timeout = LM3646_FLASH_TOUT_MAX; > + } > + pdata->flash_timeout = > + min_t(u32, pdata->flash_timeout, LM3646_FLASH_TOUT_MAX); Tabs for indentation, please. > + if (of_property_read_u32(node, > + "led1_torch_brt", &pdata->led1_torch_brt)) { > + dev_err(&client->dev, "led1 torch brightness not specified\n"); > + pdata->led1_torch_brt = LM3646_LED1_TORCH_BRT_MAX; > + } > + pdata->led1_torch_brt = > + min_t(u32, pdata->led1_torch_brt, LM3646_LED1_TORCH_BRT_MAX); > + > + if (of_property_read_u32(node, > + "led1_flash_brt", &pdata->led1_flash_brt)) { > + dev_err(&client->dev, "led1 flash brightness not specified\n"); > + pdata->led1_flash_brt = LM3646_LED1_FLASH_BRT_MAX; > + } > + pdata->led1_flash_brt = > + min_t(u32, pdata->led1_flash_brt, LM3646_LED1_FLASH_BRT_MAX); We don't have V4L2 flash definitions for DT right now. Either use manufacturer-specific prefix and document it, or have these standardised in a separate patchset. I'm all for OF support in the driver but the driver appears otherwise relatively ready, so I might even split the DT support into a separate patchset entirely which could be merged once it's complete. > +} > + > +static const struct of_device_id of_lm3642_bl_match[] = { > + {.compatible = "ti,lm3646",}, > + {}, > +}; > + > +#else > + > +static void lm3646_parse_dt(struct i2c_client *client, > + struct lm3646_platform_data *pdata) > +{ > + /* use default data in case of no data from device tree */ > + 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; > +} > + > +#endif > + > +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; > + lm3646_parse_dt(client, pdata); > + } > + 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"); > diff --git a/include/media/lm3646.h b/include/media/lm3646.h > new file mode 100644 > index 0000000..c6acf5a > --- /dev/null > +++ b/include/media/lm3646.h > @@ -0,0 +1,87 @@ > +/* > + * include/media/lm3646.h > + * > + * 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. > + */ > + > +#ifndef __LM3646_H__ > +#define __LM3646_H__ > + > +#include <media/v4l2-subdev.h> > + > +#define LM3646_NAME "lm3646" > +#define LM3646_I2C_ADDR_REV1 (0x67) > +#define LM3646_I2C_ADDR_REV0 (0x63) > + > +/* TOTAL FLASH Brightness Max > + * min 93350uA, step 93750uA, max 1499600uA > + */ > +#define LM3646_TOTAL_FLASH_BRT_MIN 93350 > +#define LM3646_TOTAL_FLASH_BRT_STEP 93750 > +#define LM3646_TOTAL_FLASH_BRT_MAX 1499600 > +#define LM3646_TOTAL_FLASH_BRT_uA_TO_REG(a) \ > + ((a) < LM3646_TOTAL_FLASH_BRT_MIN ? 0 : \ > + ((((a) - LM3646_TOTAL_FLASH_BRT_MIN) / LM3646_TOTAL_FLASH_BRT_STEP))) > + > +/* TOTAL TORCH Brightness Max > + * min 23040uA, step 23430uA, max 187100uA > + */ > +#define LM3646_TOTAL_TORCH_BRT_MIN 23040 > +#define LM3646_TOTAL_TORCH_BRT_STEP 23430 > +#define LM3646_TOTAL_TORCH_BRT_MAX 187100 > +#define LM3646_TOTAL_TORCH_BRT_uA_TO_REG(a) \ > + ((a) < LM3646_TOTAL_TORCH_BRT_MIN ? 0 : \ > + ((((a) - LM3646_TOTAL_TORCH_BRT_MIN) / LM3646_TOTAL_TORCH_BRT_STEP))) > + > +/* LED1 FLASH Brightness > + * min 23040uA, step 11718uA, max 1499600uA > + */ > +#define LM3646_LED1_FLASH_BRT_MIN 23040 > +#define LM3646_LED1_FLASH_BRT_STEP 11718 > +#define LM3646_LED1_FLASH_BRT_MAX 1499600 > +#define LM3646_LED1_FLASH_BRT_uA_TO_REG(a) \ > + ((a) <= LM3646_LED1_FLASH_BRT_MIN ? 0 : \ > + ((((a) - LM3646_LED1_FLASH_BRT_MIN) / LM3646_LED1_FLASH_BRT_STEP))+1) > + > +/* LED1 TORCH Brightness > + * min 2530uA, step 1460uA, max 187100uA > + */ > +#define LM3646_LED1_TORCH_BRT_MIN 2530 > +#define LM3646_LED1_TORCH_BRT_STEP 1460 > +#define LM3646_LED1_TORCH_BRT_MAX 187100 > +#define LM3646_LED1_TORCH_BRT_uA_TO_REG(a) \ > + ((a) <= LM3646_LED1_TORCH_BRT_MIN ? 0 : \ > + ((((a) - LM3646_LED1_TORCH_BRT_MIN) / LM3646_LED1_TORCH_BRT_STEP))+1) > + > +/* FLASH TIMEOUT DURATION > + * min 50ms, step 50ms, max 400ms > + */ > +#define LM3646_FLASH_TOUT_MIN 50 > +#define LM3646_FLASH_TOUT_STEP 50 > +#define LM3646_FLASH_TOUT_MAX 400 > +#define LM3646_FLASH_TOUT_ms_TO_REG(a) \ > + ((a) <= LM3646_FLASH_TOUT_MIN ? 0 : \ > + (((a) - LM3646_FLASH_TOUT_MIN) / LM3646_FLASH_TOUT_STEP)) > + > +/* struct lm3646_platform_data > + * > + * @flash_timeout: flash timeout > + * @led1_flash_brt: led1 flash mode brightness, uA > + * @led1_torch_brt: led1 torch mode brightness, uA > + */ > +struct lm3646_platform_data { > + > + u32 flash_timeout; > + > + u32 led1_flash_brt; > + u32 led1_torch_brt; > +}; > + > +#endif /* __LM3646_H__ */ > -- > 1.7.9.5 >
diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig index 4aa9c53..c7f2823 100644 --- a/drivers/media/i2c/Kconfig +++ b/drivers/media/i2c/Kconfig @@ -629,6 +629,15 @@ config VIDEO_LM3560 This is a driver for the lm3560 dual flash controllers. It controls flash, torch LEDs. +config VIDEO_LM3646 + tristate "LM3646 dual flash driver support" + depends on I2C && VIDEO_V4L2 && MEDIA_CONTROLLER + depends on MEDIA_CAMERA_SUPPORT + select REGMAP_I2C + ---help--- + This is a driver for the lm3646 dual flash controllers. It controls + flash, torch LEDs. + comment "Video improvement chips" config VIDEO_UPD64031A diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile index 48888ae..01b6bfc 100644 --- a/drivers/media/i2c/Makefile +++ b/drivers/media/i2c/Makefile @@ -72,6 +72,7 @@ obj-$(CONFIG_VIDEO_S5C73M3) += s5c73m3/ obj-$(CONFIG_VIDEO_ADP1653) += adp1653.o obj-$(CONFIG_VIDEO_AS3645A) += as3645a.o obj-$(CONFIG_VIDEO_LM3560) += lm3560.o +obj-$(CONFIG_VIDEO_LM3646) += lm3646.o obj-$(CONFIG_VIDEO_SMIAPP_PLL) += smiapp-pll.o obj-$(CONFIG_VIDEO_AK881X) += ak881x.o obj-$(CONFIG_VIDEO_IR_I2C) += ir-kbd-i2c.o diff --git a/drivers/media/i2c/lm3646.c b/drivers/media/i2c/lm3646.c new file mode 100644 index 0000000..acf5961 --- /dev/null +++ b/drivers/media/i2c/lm3646.c @@ -0,0 +1,456 @@ +/* + * 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/module.h> +#include <linux/i2c.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 + */ +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; +}; + +#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) +{ + int rval = -EINVAL; + + switch (led_mode) { + case V4L2_FLASH_LED_MODE_NONE: + rval = regmap_update_bits(flash->regmap, + REG_ENABLE, MASK_ENABLE, MODE_SHDN); + break; + case V4L2_FLASH_LED_MODE_TORCH: + rval = regmap_update_bits(flash->regmap, + REG_ENABLE, MASK_ENABLE, MODE_TORCH); + break; + case V4L2_FLASH_LED_MODE_FLASH: + rval = regmap_update_bits(flash->regmap, + REG_ENABLE, MASK_ENABLE, MODE_FLASH); + break; + } + return rval; +} + +/* V4L2 controls */ +static int lm3646_get_ctrl(struct v4l2_ctrl *ctrl) +{ + struct lm3646_flash *flash = to_lm3646_flash(ctrl); + int rval = -EINVAL; + + if (ctrl->id == V4L2_CID_FLASH_FAULT) { + s32 fault = 0; + unsigned int reg_val; + rval = regmap_read(flash->regmap, REG_FLAG, ®_val); + if (rval < 0) + return rval; + + if (reg_val & FAULT_TIMEOUT) + fault |= V4L2_FLASH_FAULT_TIMEOUT; + if (reg_val & FAULT_SHORT_CIRCUIT) + fault |= V4L2_FLASH_FAULT_SHORT_CIRCUIT; + if (reg_val & FAULT_UVLO) + fault |= V4L2_FLASH_FAULT_UNDER_VOLTAGE; + if (reg_val & FAULT_IVFM) + fault |= V4L2_FLASH_FAULT_INPUT_VOLTAGE; + if (reg_val & FAULT_OCP) + fault |= V4L2_FLASH_FAULT_OVER_CURRENT; + if (reg_val & FAULT_OVERTEMP) + fault |= V4L2_FLASH_FAULT_OVER_TEMPERATURE; + if (reg_val & FAULT_NTC_TRIP) + fault |= V4L2_FLASH_FAULT_LED_OVER_TEMPERATURE; + if (reg_val & FAULT_OVP) + fault |= V4L2_FLASH_FAULT_OVER_VOLTAGE; + + ctrl->val = fault; + } + + return rval; +} + +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: + reg_val = LM3646_TOTAL_TORCH_BRT_uA_TO_REG(ctrl->val); + 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; + + /* 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 */ + rval = regmap_read(flash->regmap, REG_FLAG, ®_val); + return rval; +} + +#ifdef CONFIG_OF + +static void lm3646_parse_dt(struct i2c_client *client, + struct lm3646_platform_data *pdata) +{ + struct device_node *node = client->dev.of_node; + + if (of_property_read_u32(node, + "flash_timeout", &pdata->flash_timeout)) { + dev_err(&client->dev, "flash time out not specified\n"); + pdata->flash_timeout = LM3646_FLASH_TOUT_MAX; + } + pdata->flash_timeout = + min_t(u32, pdata->flash_timeout, LM3646_FLASH_TOUT_MAX); + + if (of_property_read_u32(node, + "led1_torch_brt", &pdata->led1_torch_brt)) { + dev_err(&client->dev, "led1 torch brightness not specified\n"); + pdata->led1_torch_brt = LM3646_LED1_TORCH_BRT_MAX; + } + pdata->led1_torch_brt = + min_t(u32, pdata->led1_torch_brt, LM3646_LED1_TORCH_BRT_MAX); + + if (of_property_read_u32(node, + "led1_flash_brt", &pdata->led1_flash_brt)) { + dev_err(&client->dev, "led1 flash brightness not specified\n"); + pdata->led1_flash_brt = LM3646_LED1_FLASH_BRT_MAX; + } + pdata->led1_flash_brt = + min_t(u32, pdata->led1_flash_brt, LM3646_LED1_FLASH_BRT_MAX); +} + +static const struct of_device_id of_lm3642_bl_match[] = { + {.compatible = "ti,lm3646",}, + {}, +}; + +#else + +static void lm3646_parse_dt(struct i2c_client *client, + struct lm3646_platform_data *pdata) +{ + /* use default data in case of no data from device tree */ + 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; +} + +#endif + +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; + lm3646_parse_dt(client, pdata); + } + 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"); diff --git a/include/media/lm3646.h b/include/media/lm3646.h new file mode 100644 index 0000000..c6acf5a --- /dev/null +++ b/include/media/lm3646.h @@ -0,0 +1,87 @@ +/* + * include/media/lm3646.h + * + * 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. + */ + +#ifndef __LM3646_H__ +#define __LM3646_H__ + +#include <media/v4l2-subdev.h> + +#define LM3646_NAME "lm3646" +#define LM3646_I2C_ADDR_REV1 (0x67) +#define LM3646_I2C_ADDR_REV0 (0x63) + +/* TOTAL FLASH Brightness Max + * min 93350uA, step 93750uA, max 1499600uA + */ +#define LM3646_TOTAL_FLASH_BRT_MIN 93350 +#define LM3646_TOTAL_FLASH_BRT_STEP 93750 +#define LM3646_TOTAL_FLASH_BRT_MAX 1499600 +#define LM3646_TOTAL_FLASH_BRT_uA_TO_REG(a) \ + ((a) < LM3646_TOTAL_FLASH_BRT_MIN ? 0 : \ + ((((a) - LM3646_TOTAL_FLASH_BRT_MIN) / LM3646_TOTAL_FLASH_BRT_STEP))) + +/* TOTAL TORCH Brightness Max + * min 23040uA, step 23430uA, max 187100uA + */ +#define LM3646_TOTAL_TORCH_BRT_MIN 23040 +#define LM3646_TOTAL_TORCH_BRT_STEP 23430 +#define LM3646_TOTAL_TORCH_BRT_MAX 187100 +#define LM3646_TOTAL_TORCH_BRT_uA_TO_REG(a) \ + ((a) < LM3646_TOTAL_TORCH_BRT_MIN ? 0 : \ + ((((a) - LM3646_TOTAL_TORCH_BRT_MIN) / LM3646_TOTAL_TORCH_BRT_STEP))) + +/* LED1 FLASH Brightness + * min 23040uA, step 11718uA, max 1499600uA + */ +#define LM3646_LED1_FLASH_BRT_MIN 23040 +#define LM3646_LED1_FLASH_BRT_STEP 11718 +#define LM3646_LED1_FLASH_BRT_MAX 1499600 +#define LM3646_LED1_FLASH_BRT_uA_TO_REG(a) \ + ((a) <= LM3646_LED1_FLASH_BRT_MIN ? 0 : \ + ((((a) - LM3646_LED1_FLASH_BRT_MIN) / LM3646_LED1_FLASH_BRT_STEP))+1) + +/* LED1 TORCH Brightness + * min 2530uA, step 1460uA, max 187100uA + */ +#define LM3646_LED1_TORCH_BRT_MIN 2530 +#define LM3646_LED1_TORCH_BRT_STEP 1460 +#define LM3646_LED1_TORCH_BRT_MAX 187100 +#define LM3646_LED1_TORCH_BRT_uA_TO_REG(a) \ + ((a) <= LM3646_LED1_TORCH_BRT_MIN ? 0 : \ + ((((a) - LM3646_LED1_TORCH_BRT_MIN) / LM3646_LED1_TORCH_BRT_STEP))+1) + +/* FLASH TIMEOUT DURATION + * min 50ms, step 50ms, max 400ms + */ +#define LM3646_FLASH_TOUT_MIN 50 +#define LM3646_FLASH_TOUT_STEP 50 +#define LM3646_FLASH_TOUT_MAX 400 +#define LM3646_FLASH_TOUT_ms_TO_REG(a) \ + ((a) <= LM3646_FLASH_TOUT_MIN ? 0 : \ + (((a) - LM3646_FLASH_TOUT_MIN) / LM3646_FLASH_TOUT_STEP)) + +/* struct lm3646_platform_data + * + * @flash_timeout: flash timeout + * @led1_flash_brt: led1 flash mode brightness, uA + * @led1_torch_brt: led1 torch mode brightness, uA + */ +struct lm3646_platform_data { + + u32 flash_timeout; + + u32 led1_flash_brt; + u32 led1_torch_brt; +}; + +#endif /* __LM3646_H__ */
harware description check priorities platform data -> device tree -> default data Signed-off-by: Daniel Jeong <gshark.jeong@gmail.com> --- drivers/media/i2c/Kconfig | 9 + drivers/media/i2c/Makefile | 1 + drivers/media/i2c/lm3646.c | 456 ++++++++++++++++++++++++++++++++++++++++++++ include/media/lm3646.h | 87 +++++++++ 4 files changed, 553 insertions(+) create mode 100644 drivers/media/i2c/lm3646.c create mode 100644 include/media/lm3646.h