| /* |
| * drivers/media/i2c/adp1653.c |
| * |
| * Copyright (C) 2008--2011 Nokia Corporation |
| * |
| * Contact: Sakari Ailus <sakari.ailus@iki.fi> |
| * |
| * Contributors: |
| * Sakari Ailus <sakari.ailus@iki.fi> |
| * Tuukka Toivonen <tuukkat76@gmail.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. |
| * |
| * This program is distributed in the hope that it will be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA |
| * 02110-1301 USA |
| * |
| * TODO: |
| * - fault interrupt handling |
| * - hardware strobe |
| * - power doesn't need to be ON if all lights are off |
| * |
| */ |
| |
| #include <linux/delay.h> |
| #include <linux/module.h> |
| #include <linux/i2c.h> |
| #include <linux/slab.h> |
| #include <media/adp1653.h> |
| #include <media/v4l2-device.h> |
| |
| #define TIMEOUT_MAX 820000 |
| #define TIMEOUT_STEP 54600 |
| #define TIMEOUT_MIN (TIMEOUT_MAX - ADP1653_REG_CONFIG_TMR_SET_MAX \ |
| * TIMEOUT_STEP) |
| #define TIMEOUT_US_TO_CODE(t) ((TIMEOUT_MAX + (TIMEOUT_STEP / 2) - (t)) \ |
| / TIMEOUT_STEP) |
| #define TIMEOUT_CODE_TO_US(c) (TIMEOUT_MAX - (c) * TIMEOUT_STEP) |
| |
| /* Write values into ADP1653 registers. */ |
| static int adp1653_update_hw(struct adp1653_flash *flash) |
| { |
| struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev); |
| u8 out_sel; |
| u8 config = 0; |
| int rval; |
| |
| out_sel = ADP1653_INDICATOR_INTENSITY_uA_TO_REG( |
| flash->indicator_intensity->val) |
| << ADP1653_REG_OUT_SEL_ILED_SHIFT; |
| |
| switch (flash->led_mode->val) { |
| case V4L2_FLASH_LED_MODE_NONE: |
| break; |
| case V4L2_FLASH_LED_MODE_FLASH: |
| /* Flash mode, light on with strobe, duration from timer */ |
| config = ADP1653_REG_CONFIG_TMR_CFG; |
| config |= TIMEOUT_US_TO_CODE(flash->flash_timeout->val) |
| << ADP1653_REG_CONFIG_TMR_SET_SHIFT; |
| break; |
| case V4L2_FLASH_LED_MODE_TORCH: |
| /* Torch mode, light immediately on, duration indefinite */ |
| out_sel |= ADP1653_FLASH_INTENSITY_mA_TO_REG( |
| flash->torch_intensity->val) |
| << ADP1653_REG_OUT_SEL_HPLED_SHIFT; |
| break; |
| } |
| |
| rval = i2c_smbus_write_byte_data(client, ADP1653_REG_OUT_SEL, out_sel); |
| if (rval < 0) |
| return rval; |
| |
| rval = i2c_smbus_write_byte_data(client, ADP1653_REG_CONFIG, config); |
| if (rval < 0) |
| return rval; |
| |
| return 0; |
| } |
| |
| static int adp1653_get_fault(struct adp1653_flash *flash) |
| { |
| struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev); |
| int fault; |
| int rval; |
| |
| fault = i2c_smbus_read_byte_data(client, ADP1653_REG_FAULT); |
| if (IS_ERR_VALUE(fault)) |
| return fault; |
| |
| flash->fault |= fault; |
| |
| if (!flash->fault) |
| return 0; |
| |
| /* Clear faults. */ |
| rval = i2c_smbus_write_byte_data(client, ADP1653_REG_OUT_SEL, 0); |
| if (IS_ERR_VALUE(rval)) |
| return rval; |
| |
| flash->led_mode->val = V4L2_FLASH_LED_MODE_NONE; |
| |
| rval = adp1653_update_hw(flash); |
| if (IS_ERR_VALUE(rval)) |
| return rval; |
| |
| return flash->fault; |
| } |
| |
| static int adp1653_strobe(struct adp1653_flash *flash, int enable) |
| { |
| struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev); |
| u8 out_sel = ADP1653_INDICATOR_INTENSITY_uA_TO_REG( |
| flash->indicator_intensity->val) |
| << ADP1653_REG_OUT_SEL_ILED_SHIFT; |
| int rval; |
| |
| if (flash->led_mode->val != V4L2_FLASH_LED_MODE_FLASH) |
| return -EBUSY; |
| |
| if (!enable) |
| return i2c_smbus_write_byte_data(client, ADP1653_REG_OUT_SEL, |
| out_sel); |
| |
| out_sel |= ADP1653_FLASH_INTENSITY_mA_TO_REG( |
| flash->flash_intensity->val) |
| << ADP1653_REG_OUT_SEL_HPLED_SHIFT; |
| rval = i2c_smbus_write_byte_data(client, ADP1653_REG_OUT_SEL, out_sel); |
| if (rval) |
| return rval; |
| |
| /* Software strobe using i2c */ |
| rval = i2c_smbus_write_byte_data(client, ADP1653_REG_SW_STROBE, |
| ADP1653_REG_SW_STROBE_SW_STROBE); |
| if (rval) |
| return rval; |
| return i2c_smbus_write_byte_data(client, ADP1653_REG_SW_STROBE, 0); |
| } |
| |
| /* -------------------------------------------------------------------------- |
| * V4L2 controls |
| */ |
| |
| static int adp1653_get_ctrl(struct v4l2_ctrl *ctrl) |
| { |
| struct adp1653_flash *flash = |
| container_of(ctrl->handler, struct adp1653_flash, ctrls); |
| int rval; |
| |
| rval = adp1653_get_fault(flash); |
| if (IS_ERR_VALUE(rval)) |
| return rval; |
| |
| ctrl->cur.val = 0; |
| |
| if (flash->fault & ADP1653_REG_FAULT_FLT_SCP) |
| ctrl->cur.val |= V4L2_FLASH_FAULT_SHORT_CIRCUIT; |
| if (flash->fault & ADP1653_REG_FAULT_FLT_OT) |
| ctrl->cur.val |= V4L2_FLASH_FAULT_OVER_TEMPERATURE; |
| if (flash->fault & ADP1653_REG_FAULT_FLT_TMR) |
| ctrl->cur.val |= V4L2_FLASH_FAULT_TIMEOUT; |
| if (flash->fault & ADP1653_REG_FAULT_FLT_OV) |
| ctrl->cur.val |= V4L2_FLASH_FAULT_OVER_VOLTAGE; |
| |
| flash->fault = 0; |
| |
| return 0; |
| } |
| |
| static int adp1653_set_ctrl(struct v4l2_ctrl *ctrl) |
| { |
| struct adp1653_flash *flash = |
| container_of(ctrl->handler, struct adp1653_flash, ctrls); |
| int rval; |
| |
| rval = adp1653_get_fault(flash); |
| if (IS_ERR_VALUE(rval)) |
| return rval; |
| if ((rval & (ADP1653_REG_FAULT_FLT_SCP | |
| ADP1653_REG_FAULT_FLT_OT | |
| ADP1653_REG_FAULT_FLT_OV)) && |
| (ctrl->id == V4L2_CID_FLASH_STROBE || |
| ctrl->id == V4L2_CID_FLASH_TORCH_INTENSITY || |
| ctrl->id == V4L2_CID_FLASH_LED_MODE)) |
| return -EBUSY; |
| |
| switch (ctrl->id) { |
| case V4L2_CID_FLASH_STROBE: |
| return adp1653_strobe(flash, 1); |
| case V4L2_CID_FLASH_STROBE_STOP: |
| return adp1653_strobe(flash, 0); |
| } |
| |
| return adp1653_update_hw(flash); |
| } |
| |
| static const struct v4l2_ctrl_ops adp1653_ctrl_ops = { |
| .g_volatile_ctrl = adp1653_get_ctrl, |
| .s_ctrl = adp1653_set_ctrl, |
| }; |
| |
| static int adp1653_init_controls(struct adp1653_flash *flash) |
| { |
| struct v4l2_ctrl *fault; |
| |
| v4l2_ctrl_handler_init(&flash->ctrls, 9); |
| |
| flash->led_mode = |
| v4l2_ctrl_new_std_menu(&flash->ctrls, &adp1653_ctrl_ops, |
| V4L2_CID_FLASH_LED_MODE, |
| V4L2_FLASH_LED_MODE_TORCH, ~0x7, 0); |
| v4l2_ctrl_new_std_menu(&flash->ctrls, &adp1653_ctrl_ops, |
| V4L2_CID_FLASH_STROBE_SOURCE, |
| V4L2_FLASH_STROBE_SOURCE_SOFTWARE, ~0x1, 0); |
| v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops, |
| V4L2_CID_FLASH_STROBE, 0, 0, 0, 0); |
| v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops, |
| V4L2_CID_FLASH_STROBE_STOP, 0, 0, 0, 0); |
| flash->flash_timeout = |
| v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops, |
| V4L2_CID_FLASH_TIMEOUT, TIMEOUT_MIN, |
| flash->platform_data->max_flash_timeout, |
| TIMEOUT_STEP, |
| flash->platform_data->max_flash_timeout); |
| flash->flash_intensity = |
| v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops, |
| V4L2_CID_FLASH_INTENSITY, |
| ADP1653_FLASH_INTENSITY_MIN, |
| flash->platform_data->max_flash_intensity, |
| 1, flash->platform_data->max_flash_intensity); |
| flash->torch_intensity = |
| v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops, |
| V4L2_CID_FLASH_TORCH_INTENSITY, |
| ADP1653_TORCH_INTENSITY_MIN, |
| flash->platform_data->max_torch_intensity, |
| ADP1653_FLASH_INTENSITY_STEP, |
| flash->platform_data->max_torch_intensity); |
| flash->indicator_intensity = |
| v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops, |
| V4L2_CID_FLASH_INDICATOR_INTENSITY, |
| ADP1653_INDICATOR_INTENSITY_MIN, |
| flash->platform_data->max_indicator_intensity, |
| ADP1653_INDICATOR_INTENSITY_STEP, |
| ADP1653_INDICATOR_INTENSITY_MIN); |
| fault = v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops, |
| V4L2_CID_FLASH_FAULT, 0, |
| V4L2_FLASH_FAULT_OVER_VOLTAGE |
| | V4L2_FLASH_FAULT_OVER_TEMPERATURE |
| | V4L2_FLASH_FAULT_SHORT_CIRCUIT, 0, 0); |
| |
| if (flash->ctrls.error) |
| return flash->ctrls.error; |
| |
| fault->flags |= V4L2_CTRL_FLAG_VOLATILE; |
| |
| flash->subdev.ctrl_handler = &flash->ctrls; |
| return 0; |
| } |
| |
| /* -------------------------------------------------------------------------- |
| * V4L2 subdev operations |
| */ |
| |
| static int |
| adp1653_init_device(struct adp1653_flash *flash) |
| { |
| struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev); |
| int rval; |
| |
| /* Clear FAULT register by writing zero to OUT_SEL */ |
| rval = i2c_smbus_write_byte_data(client, ADP1653_REG_OUT_SEL, 0); |
| if (rval < 0) { |
| dev_err(&client->dev, "failed writing fault register\n"); |
| return -EIO; |
| } |
| |
| mutex_lock(flash->ctrls.lock); |
| /* Reset faults before reading new ones. */ |
| flash->fault = 0; |
| rval = adp1653_get_fault(flash); |
| mutex_unlock(flash->ctrls.lock); |
| if (rval > 0) { |
| dev_err(&client->dev, "faults detected: 0x%1.1x\n", rval); |
| return -EIO; |
| } |
| |
| mutex_lock(flash->ctrls.lock); |
| rval = adp1653_update_hw(flash); |
| mutex_unlock(flash->ctrls.lock); |
| if (rval) { |
| dev_err(&client->dev, |
| "adp1653_update_hw failed at %s\n", __func__); |
| return -EIO; |
| } |
| |
| return 0; |
| } |
| |
| static int |
| __adp1653_set_power(struct adp1653_flash *flash, int on) |
| { |
| int ret; |
| |
| ret = flash->platform_data->power(&flash->subdev, on); |
| if (ret < 0) |
| return ret; |
| |
| if (!on) |
| return 0; |
| |
| ret = adp1653_init_device(flash); |
| if (ret < 0) |
| flash->platform_data->power(&flash->subdev, 0); |
| |
| return ret; |
| } |
| |
| static int |
| adp1653_set_power(struct v4l2_subdev *subdev, int on) |
| { |
| struct adp1653_flash *flash = to_adp1653_flash(subdev); |
| int ret = 0; |
| |
| mutex_lock(&flash->power_lock); |
| |
| /* If the power count is modified from 0 to != 0 or from != 0 to 0, |
| * update the power state. |
| */ |
| if (flash->power_count == !on) { |
| ret = __adp1653_set_power(flash, !!on); |
| if (ret < 0) |
| goto done; |
| } |
| |
| /* Update the power count. */ |
| flash->power_count += on ? 1 : -1; |
| WARN_ON(flash->power_count < 0); |
| |
| done: |
| mutex_unlock(&flash->power_lock); |
| return ret; |
| } |
| |
| static int adp1653_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh) |
| { |
| return adp1653_set_power(sd, 1); |
| } |
| |
| static int adp1653_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh) |
| { |
| return adp1653_set_power(sd, 0); |
| } |
| |
| static const struct v4l2_subdev_core_ops adp1653_core_ops = { |
| .s_power = adp1653_set_power, |
| }; |
| |
| static const struct v4l2_subdev_ops adp1653_ops = { |
| .core = &adp1653_core_ops, |
| }; |
| |
| static const struct v4l2_subdev_internal_ops adp1653_internal_ops = { |
| .open = adp1653_open, |
| .close = adp1653_close, |
| }; |
| |
| /* -------------------------------------------------------------------------- |
| * I2C driver |
| */ |
| #ifdef CONFIG_PM |
| |
| static int adp1653_suspend(struct device *dev) |
| { |
| struct i2c_client *client = to_i2c_client(dev); |
| struct v4l2_subdev *subdev = i2c_get_clientdata(client); |
| struct adp1653_flash *flash = to_adp1653_flash(subdev); |
| |
| if (!flash->power_count) |
| return 0; |
| |
| return __adp1653_set_power(flash, 0); |
| } |
| |
| static int adp1653_resume(struct device *dev) |
| { |
| struct i2c_client *client = to_i2c_client(dev); |
| struct v4l2_subdev *subdev = i2c_get_clientdata(client); |
| struct adp1653_flash *flash = to_adp1653_flash(subdev); |
| |
| if (!flash->power_count) |
| return 0; |
| |
| return __adp1653_set_power(flash, 1); |
| } |
| |
| #else |
| |
| #define adp1653_suspend NULL |
| #define adp1653_resume NULL |
| |
| #endif /* CONFIG_PM */ |
| |
| static int adp1653_probe(struct i2c_client *client, |
| const struct i2c_device_id *devid) |
| { |
| struct adp1653_flash *flash; |
| int ret; |
| |
| /* we couldn't work without platform data */ |
| if (client->dev.platform_data == NULL) |
| return -ENODEV; |
| |
| flash = kzalloc(sizeof(*flash), GFP_KERNEL); |
| if (flash == NULL) |
| return -ENOMEM; |
| |
| flash->platform_data = client->dev.platform_data; |
| |
| mutex_init(&flash->power_lock); |
| |
| v4l2_i2c_subdev_init(&flash->subdev, client, &adp1653_ops); |
| flash->subdev.internal_ops = &adp1653_internal_ops; |
| flash->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE; |
| |
| ret = adp1653_init_controls(flash); |
| if (ret) |
| goto free_and_quit; |
| |
| ret = media_entity_init(&flash->subdev.entity, 0, NULL, 0); |
| if (ret < 0) |
| goto free_and_quit; |
| |
| flash->subdev.entity.type = MEDIA_ENT_T_V4L2_SUBDEV_FLASH; |
| |
| return 0; |
| |
| free_and_quit: |
| v4l2_ctrl_handler_free(&flash->ctrls); |
| kfree(flash); |
| return ret; |
| } |
| |
| static int adp1653_remove(struct i2c_client *client) |
| { |
| struct v4l2_subdev *subdev = i2c_get_clientdata(client); |
| struct adp1653_flash *flash = to_adp1653_flash(subdev); |
| |
| v4l2_device_unregister_subdev(&flash->subdev); |
| v4l2_ctrl_handler_free(&flash->ctrls); |
| media_entity_cleanup(&flash->subdev.entity); |
| kfree(flash); |
| return 0; |
| } |
| |
| static const struct i2c_device_id adp1653_id_table[] = { |
| { ADP1653_NAME, 0 }, |
| { } |
| }; |
| MODULE_DEVICE_TABLE(i2c, adp1653_id_table); |
| |
| static struct dev_pm_ops adp1653_pm_ops = { |
| .suspend = adp1653_suspend, |
| .resume = adp1653_resume, |
| }; |
| |
| static struct i2c_driver adp1653_i2c_driver = { |
| .driver = { |
| .name = ADP1653_NAME, |
| .pm = &adp1653_pm_ops, |
| }, |
| .probe = adp1653_probe, |
| .remove = adp1653_remove, |
| .id_table = adp1653_id_table, |
| }; |
| |
| module_i2c_driver(adp1653_i2c_driver); |
| |
| MODULE_AUTHOR("Sakari Ailus <sakari.ailus@nokia.com>"); |
| MODULE_DESCRIPTION("Analog Devices ADP1653 LED flash driver"); |
| MODULE_LICENSE("GPL"); |