diff options
Diffstat (limited to 'drivers/staging/media/atomisp/i2c/lm3554.c')
| -rw-r--r-- | drivers/staging/media/atomisp/i2c/lm3554.c | 1009 |
1 files changed, 1009 insertions, 0 deletions
diff --git a/drivers/staging/media/atomisp/i2c/lm3554.c b/drivers/staging/media/atomisp/i2c/lm3554.c new file mode 100644 index 0000000..dd9c9c3 --- /dev/null +++ b/drivers/staging/media/atomisp/i2c/lm3554.c @@ -0,0 +1,1009 @@ +/* + * LED flash driver for LM3554 + * + * Copyright (c) 2010-2012 Intel Corporation. All Rights Reserved. + * + * 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 Street, Fifth Floor, Boston, MA + * 02110-1301, USA. + * + */ +#include <linux/module.h> +#include <linux/i2c.h> +#include <linux/mutex.h> +#include <linux/delay.h> +#include <linux/gpio.h> +#include <linux/slab.h> + +#include "../include/media/lm3554.h" +#include <media/v4l2-ctrls.h> +#include <media/v4l2-device.h> +#include <linux/acpi.h> +#include <linux/gpio/consumer.h> +#include "../include/linux/atomisp_gmin_platform.h" +#include "../include/linux/atomisp.h" + +/* Registers */ + +#define LM3554_TORCH_BRIGHTNESS_REG 0xA0 +#define LM3554_TORCH_MODE_SHIFT 0 +#define LM3554_TORCH_CURRENT_SHIFT 3 +#define LM3554_INDICATOR_CURRENT_SHIFT 6 + +#define LM3554_FLASH_BRIGHTNESS_REG 0xB0 +#define LM3554_FLASH_MODE_SHIFT 0 +#define LM3554_FLASH_CURRENT_SHIFT 3 +#define LM3554_STROBE_SENSITIVITY_SHIFT 7 + +#define LM3554_FLASH_DURATION_REG 0xC0 +#define LM3554_FLASH_TIMEOUT_SHIFT 0 +#define LM3554_CURRENT_LIMIT_SHIFT 5 + +#define LM3554_FLAGS_REG 0xD0 +#define LM3554_FLAG_TIMEOUT (1 << 0) +#define LM3554_FLAG_THERMAL_SHUTDOWN (1 << 1) +#define LM3554_FLAG_LED_FAULT (1 << 2) +#define LM3554_FLAG_TX1_INTERRUPT (1 << 3) +#define LM3554_FLAG_TX2_INTERRUPT (1 << 4) +#define LM3554_FLAG_LED_THERMAL_FAULT (1 << 5) +#define LM3554_FLAG_UNUSED (1 << 6) +#define LM3554_FLAG_INPUT_VOLTAGE_LOW (1 << 7) + +#define LM3554_CONFIG_REG_1 0xE0 +#define LM3554_ENVM_TX2_SHIFT 5 +#define LM3554_TX2_POLARITY_SHIFT 6 + +struct lm3554 { + struct v4l2_subdev sd; + + struct mutex power_lock; + struct v4l2_ctrl_handler ctrl_handler; + int power_count; + + unsigned int mode; + int timeout; + u8 torch_current; + u8 indicator_current; + u8 flash_current; + + struct timer_list flash_off_delay; + struct lm3554_platform_data *pdata; +}; + +#define to_lm3554(p_sd) container_of(p_sd, struct lm3554, sd) + +/* Return negative errno else zero on success */ +static int lm3554_write(struct lm3554 *flash, u8 addr, u8 val) +{ + struct i2c_client *client = v4l2_get_subdevdata(&flash->sd); + int ret; + + ret = i2c_smbus_write_byte_data(client, addr, val); + + dev_dbg(&client->dev, "Write Addr:%02X Val:%02X %s\n", addr, val, + ret < 0 ? "fail" : "ok"); + + return ret; +} + +/* Return negative errno else a data byte received from the device. */ +static int lm3554_read(struct lm3554 *flash, u8 addr) +{ + struct i2c_client *client = v4l2_get_subdevdata(&flash->sd); + int ret; + + ret = i2c_smbus_read_byte_data(client, addr); + + dev_dbg(&client->dev, "Read Addr:%02X Val:%02X %s\n", addr, ret, + ret < 0 ? "fail" : "ok"); + + return ret; +} + +/* ----------------------------------------------------------------------------- + * Hardware configuration + */ + +static int lm3554_set_mode(struct lm3554 *flash, unsigned int mode) +{ + u8 val; + int ret; + + val = (mode << LM3554_FLASH_MODE_SHIFT) | + (flash->flash_current << LM3554_FLASH_CURRENT_SHIFT); + + ret = lm3554_write(flash, LM3554_FLASH_BRIGHTNESS_REG, val); + if (ret == 0) + flash->mode = mode; + return ret; +} + +static int lm3554_set_torch(struct lm3554 *flash) +{ + u8 val; + + val = (flash->mode << LM3554_TORCH_MODE_SHIFT) | + (flash->torch_current << LM3554_TORCH_CURRENT_SHIFT) | + (flash->indicator_current << LM3554_INDICATOR_CURRENT_SHIFT); + + return lm3554_write(flash, LM3554_TORCH_BRIGHTNESS_REG, val); +} + +static int lm3554_set_flash(struct lm3554 *flash) +{ + u8 val; + + val = (flash->mode << LM3554_FLASH_MODE_SHIFT) | + (flash->flash_current << LM3554_FLASH_CURRENT_SHIFT); + + return lm3554_write(flash, LM3554_FLASH_BRIGHTNESS_REG, val); +} + +static int lm3554_set_duration(struct lm3554 *flash) +{ + u8 val; + + val = (flash->timeout << LM3554_FLASH_TIMEOUT_SHIFT) | + (flash->pdata->current_limit << LM3554_CURRENT_LIMIT_SHIFT); + + return lm3554_write(flash, LM3554_FLASH_DURATION_REG, val); +} + +static int lm3554_set_config1(struct lm3554 *flash) +{ + u8 val; + + val = (flash->pdata->envm_tx2 << LM3554_ENVM_TX2_SHIFT) | + (flash->pdata->tx2_polarity << LM3554_TX2_POLARITY_SHIFT); + return lm3554_write(flash, LM3554_CONFIG_REG_1, val); +} + +/* ----------------------------------------------------------------------------- + * Hardware trigger + */ +static void lm3554_flash_off_delay(long unsigned int arg) +{ + struct v4l2_subdev *sd = i2c_get_clientdata((struct i2c_client *)arg); + struct lm3554 *flash = to_lm3554(sd); + struct lm3554_platform_data *pdata = flash->pdata; + + gpio_set_value(pdata->gpio_strobe, 0); +} + +static int lm3554_hw_strobe(struct i2c_client *client, bool strobe) +{ + int ret, timer_pending; + struct v4l2_subdev *sd = i2c_get_clientdata(client); + struct lm3554 *flash = to_lm3554(sd); + struct lm3554_platform_data *pdata = flash->pdata; + + /* + * An abnormal high flash current is observed when strobe off the + * flash. Workaround here is firstly set flash current to lower level, + * wait a short moment, and then strobe off the flash. + */ + + timer_pending = del_timer_sync(&flash->flash_off_delay); + + /* Flash off */ + if (!strobe) { + /* set current to 70mA and wait a while */ + ret = lm3554_write(flash, LM3554_FLASH_BRIGHTNESS_REG, 0); + if (ret < 0) + goto err; + mod_timer(&flash->flash_off_delay, + jiffies + msecs_to_jiffies(LM3554_TIMER_DELAY)); + return 0; + } + + /* Flash on */ + + /* + * If timer is killed before run, flash is not strobe off, + * so must strobe off here + */ + if (timer_pending) + gpio_set_value(pdata->gpio_strobe, 0); + + /* Restore flash current settings */ + ret = lm3554_set_flash(flash); + if (ret < 0) + goto err; + + /* Strobe on Flash */ + gpio_set_value(pdata->gpio_strobe, 1); + + return 0; +err: + dev_err(&client->dev, "failed to %s flash strobe (%d)\n", + strobe ? "on" : "off", ret); + return ret; +} + +/* ----------------------------------------------------------------------------- + * V4L2 controls + */ + +static int lm3554_read_status(struct lm3554 *flash) +{ + int ret; + struct i2c_client *client = v4l2_get_subdevdata(&flash->sd); + + /* NOTE: reading register clear fault status */ + ret = lm3554_read(flash, LM3554_FLAGS_REG); + if (ret < 0) + return ret; + + /* + * Accordingly to datasheet we read back '1' in bit 6. + * Clear it first. + */ + ret &= ~LM3554_FLAG_UNUSED; + + /* + * Do not take TX1/TX2 signal as an error + * because MSIC will not turn off flash, but turn to + * torch mode according to gsm modem signal by hardware. + */ + ret &= ~(LM3554_FLAG_TX1_INTERRUPT | LM3554_FLAG_TX2_INTERRUPT); + + if (ret > 0) + dev_dbg(&client->dev, "LM3554 flag status: %02x\n", ret); + + return ret; +} + +static int lm3554_s_flash_timeout(struct v4l2_subdev *sd, u32 val) +{ + struct lm3554 *flash = to_lm3554(sd); + + val = clamp(val, LM3554_MIN_TIMEOUT, LM3554_MAX_TIMEOUT); + val = val / LM3554_TIMEOUT_STEPSIZE - 1; + + flash->timeout = val; + + return lm3554_set_duration(flash); +} + +static int lm3554_g_flash_timeout(struct v4l2_subdev *sd, s32 *val) +{ + struct lm3554 *flash = to_lm3554(sd); + + *val = (u32)(flash->timeout + 1) * LM3554_TIMEOUT_STEPSIZE; + + return 0; +} + +static int lm3554_s_flash_intensity(struct v4l2_subdev *sd, u32 intensity) +{ + struct lm3554 *flash = to_lm3554(sd); + + intensity = LM3554_CLAMP_PERCENTAGE(intensity); + intensity = LM3554_PERCENT_TO_VALUE(intensity, LM3554_FLASH_STEP); + + flash->flash_current = intensity; + + return lm3554_set_flash(flash); +} + +static int lm3554_g_flash_intensity(struct v4l2_subdev *sd, s32 *val) +{ + struct lm3554 *flash = to_lm3554(sd); + + *val = LM3554_VALUE_TO_PERCENT((u32)flash->flash_current, + LM3554_FLASH_STEP); + + return 0; +} + +static int lm3554_s_torch_intensity(struct v4l2_subdev *sd, u32 intensity) +{ + struct lm3554 *flash = to_lm3554(sd); + + intensity = LM3554_CLAMP_PERCENTAGE(intensity); + intensity = LM3554_PERCENT_TO_VALUE(intensity, LM3554_TORCH_STEP); + + flash->torch_current = intensity; + + return lm3554_set_torch(flash); +} + +static int lm3554_g_torch_intensity(struct v4l2_subdev *sd, s32 *val) +{ + struct lm3554 *flash = to_lm3554(sd); + + *val = LM3554_VALUE_TO_PERCENT((u32)flash->torch_current, + LM3554_TORCH_STEP); + + return 0; +} + +static int lm3554_s_indicator_intensity(struct v4l2_subdev *sd, u32 intensity) +{ + struct lm3554 *flash = to_lm3554(sd); + + intensity = LM3554_CLAMP_PERCENTAGE(intensity); + intensity = LM3554_PERCENT_TO_VALUE(intensity, LM3554_INDICATOR_STEP); + + flash->indicator_current = intensity; + + return lm3554_set_torch(flash); +} + +static int lm3554_g_indicator_intensity(struct v4l2_subdev *sd, s32 *val) +{ + struct lm3554 *flash = to_lm3554(sd); + + *val = LM3554_VALUE_TO_PERCENT((u32)flash->indicator_current, + LM3554_INDICATOR_STEP); + + return 0; +} + +static int lm3554_s_flash_strobe(struct v4l2_subdev *sd, u32 val) +{ + struct i2c_client *client = v4l2_get_subdevdata(sd); + + return lm3554_hw_strobe(client, val); +} + +static int lm3554_s_flash_mode(struct v4l2_subdev *sd, u32 new_mode) +{ + struct lm3554 *flash = to_lm3554(sd); + unsigned int mode; + + switch (new_mode) { + case ATOMISP_FLASH_MODE_OFF: + mode = LM3554_MODE_SHUTDOWN; + break; + case ATOMISP_FLASH_MODE_FLASH: + mode = LM3554_MODE_FLASH; + break; + case ATOMISP_FLASH_MODE_INDICATOR: + mode = LM3554_MODE_INDICATOR; + break; + case ATOMISP_FLASH_MODE_TORCH: + mode = LM3554_MODE_TORCH; + break; + default: + return -EINVAL; + } + + return lm3554_set_mode(flash, mode); +} + +static int lm3554_g_flash_mode(struct v4l2_subdev *sd, s32 *val) +{ + struct lm3554 *flash = to_lm3554(sd); + *val = flash->mode; + return 0; +} + +static int lm3554_g_flash_status(struct v4l2_subdev *sd, s32 *val) +{ + struct lm3554 *flash = to_lm3554(sd); + int value; + + value = lm3554_read_status(flash); + if (value < 0) + return value; + + if (value & LM3554_FLAG_TIMEOUT) + *val = ATOMISP_FLASH_STATUS_TIMEOUT; + else if (value > 0) + *val = ATOMISP_FLASH_STATUS_HW_ERROR; + else + *val = ATOMISP_FLASH_STATUS_OK; + + return 0; +} + +#ifndef CSS15 +static int lm3554_g_flash_status_register(struct v4l2_subdev *sd, s32 *val) +{ + struct lm3554 *flash = to_lm3554(sd); + int ret; + + ret = lm3554_read(flash, LM3554_FLAGS_REG); + + if (ret < 0) + return ret; + + *val = ret; + return 0; +} +#endif + +static int lm3554_s_ctrl(struct v4l2_ctrl *ctrl) +{ + struct lm3554 *dev = + container_of(ctrl->handler, struct lm3554, ctrl_handler); + int ret = 0; + + switch (ctrl->id) { + case V4L2_CID_FLASH_TIMEOUT: + ret = lm3554_s_flash_timeout(&dev->sd, ctrl->val); + break; + case V4L2_CID_FLASH_INTENSITY: + ret = lm3554_s_flash_intensity(&dev->sd, ctrl->val); + break; + case V4L2_CID_FLASH_TORCH_INTENSITY: + ret = lm3554_s_torch_intensity(&dev->sd, ctrl->val); + break; + case V4L2_CID_FLASH_INDICATOR_INTENSITY: + ret = lm3554_s_indicator_intensity(&dev->sd, ctrl->val); + break; + case V4L2_CID_FLASH_STROBE: + ret = lm3554_s_flash_strobe(&dev->sd, ctrl->val); + break; + case V4L2_CID_FLASH_MODE: + ret = lm3554_s_flash_mode(&dev->sd, ctrl->val); + break; + default: + ret = -EINVAL; + } + return ret; +} + +static int lm3554_g_volatile_ctrl(struct v4l2_ctrl *ctrl) +{ + struct lm3554 *dev = + container_of(ctrl->handler, struct lm3554, ctrl_handler); + int ret = 0; + + switch (ctrl->id) { + case V4L2_CID_FLASH_TIMEOUT: + ret = lm3554_g_flash_timeout(&dev->sd, &ctrl->val); + break; + case V4L2_CID_FLASH_INTENSITY: + ret = lm3554_g_flash_intensity(&dev->sd, &ctrl->val); + break; + case V4L2_CID_FLASH_TORCH_INTENSITY: + ret = lm3554_g_torch_intensity(&dev->sd, &ctrl->val); + break; + case V4L2_CID_FLASH_INDICATOR_INTENSITY: + ret = lm3554_g_indicator_intensity(&dev->sd, &ctrl->val); + break; + case V4L2_CID_FLASH_MODE: + ret = lm3554_g_flash_mode(&dev->sd, &ctrl->val); + break; + case V4L2_CID_FLASH_STATUS: + ret = lm3554_g_flash_status(&dev->sd, &ctrl->val); + break; +#ifndef CSS15 + case V4L2_CID_FLASH_STATUS_REGISTER: + ret = lm3554_g_flash_status_register(&dev->sd, &ctrl->val); + break; +#endif + default: + ret = -EINVAL; + } + + return ret; +} + +static const struct v4l2_ctrl_ops ctrl_ops = { + .s_ctrl = lm3554_s_ctrl, + .g_volatile_ctrl = lm3554_g_volatile_ctrl +}; + +struct v4l2_ctrl_config lm3554_controls[] = { + { + .ops = &ctrl_ops, + .id = V4L2_CID_FLASH_TIMEOUT, + .type = V4L2_CTRL_TYPE_INTEGER, + .name = "Flash Timeout", + .min = 0x0, + .max = LM3554_MAX_TIMEOUT, + .step = 0x01, + .def = LM3554_DEFAULT_TIMEOUT, + .flags = 0, + }, + { + .ops = &ctrl_ops, + .id = V4L2_CID_FLASH_INTENSITY, + .type = V4L2_CTRL_TYPE_INTEGER, + .name = "Flash Intensity", + .min = LM3554_MIN_PERCENT, + .max = LM3554_MAX_PERCENT, + .step = 0x01, + .def = LM3554_FLASH_DEFAULT_BRIGHTNESS, + .flags = 0, + }, + { + .ops = &ctrl_ops, + .id = V4L2_CID_FLASH_TORCH_INTENSITY, + .type = V4L2_CTRL_TYPE_INTEGER, + .name = "Torch Intensity", + .min = LM3554_MIN_PERCENT, + .max = LM3554_MAX_PERCENT, + .step = 0x01, + .def = LM3554_TORCH_DEFAULT_BRIGHTNESS, + .flags = 0, + }, + { + .ops = &ctrl_ops, + .id = V4L2_CID_FLASH_INDICATOR_INTENSITY, + .type = V4L2_CTRL_TYPE_INTEGER, + .name = "Indicator Intensity", + .min = LM3554_MIN_PERCENT, + .max = LM3554_MAX_PERCENT, + .step = 0x01, + .def = LM3554_INDICATOR_DEFAULT_BRIGHTNESS, + .flags = 0, + }, + { + .ops = &ctrl_ops, + .id = V4L2_CID_FLASH_STROBE, + .type = V4L2_CTRL_TYPE_BOOLEAN, + .name = "Flash Strobe", + .min = 0, + .max = 1, + .step = 1, + .def = 0, + .flags = 0, + }, + { + .ops = &ctrl_ops, + .id = V4L2_CID_FLASH_MODE, + .type = V4L2_CTRL_TYPE_INTEGER, + .name = "Flash Mode", + .min = 0, + .max = 100, + .step = 1, + .def = ATOMISP_FLASH_MODE_OFF, + .flags = 0, + }, + { + .ops = &ctrl_ops, + .id = V4L2_CID_FLASH_STATUS, + .type = V4L2_CTRL_TYPE_BOOLEAN, + .name = "Flash Status", + .min = 0, + .max = 100, + .step = 1, + .def = ATOMISP_FLASH_STATUS_OK, + .flags = 0, + }, +#ifndef CSS15 + { + .ops = &ctrl_ops, + .id = V4L2_CID_FLASH_STATUS_REGISTER, + .type = V4L2_CTRL_TYPE_BOOLEAN, + .name = "Flash Status Register", + .min = 0, + .max = 100, + .step = 1, + .def = 0, + .flags = 0, + }, +#endif +}; + +/* ----------------------------------------------------------------------------- + * V4L2 subdev core operations + */ + +/* Put device into known state. */ +static int lm3554_setup(struct lm3554 *flash) +{ + struct i2c_client *client = v4l2_get_subdevdata(&flash->sd); + int ret; + + /* clear the flags register */ + ret = lm3554_read(flash, LM3554_FLAGS_REG); + if (ret < 0) + return ret; + + dev_dbg(&client->dev, "Fault info: %02x\n", ret); + + ret = lm3554_set_config1(flash); + if (ret < 0) + return ret; + + ret = lm3554_set_duration(flash); + if (ret < 0) + return ret; + + ret = lm3554_set_torch(flash); + if (ret < 0) + return ret; + + ret = lm3554_set_flash(flash); + if (ret < 0) + return ret; + + /* read status */ + ret = lm3554_read_status(flash); + if (ret < 0) + return ret; + + return ret ? -EIO : 0; +} + +static int __lm3554_s_power(struct lm3554 *flash, int power) +{ + struct lm3554_platform_data *pdata = flash->pdata; + int ret; + + /*initialize flash driver*/ + gpio_set_value(pdata->gpio_reset, power); + usleep_range(100, 100 + 1); + + if (power) { + /* Setup default values. This makes sure that the chip + * is in a known state. + */ + ret = lm3554_setup(flash); + if (ret < 0) { + __lm3554_s_power(flash, 0); + return ret; + } + } + + return 0; +} + +static int lm3554_s_power(struct v4l2_subdev *sd, int power) +{ + struct lm3554 *flash = to_lm3554(sd); + int ret = 0; + + mutex_lock(&flash->power_lock); + + if (flash->power_count == !power) { + ret = __lm3554_s_power(flash, !!power); + if (ret < 0) + goto done; + } + + flash->power_count += power ? 1 : -1; + WARN_ON(flash->power_count < 0); + +done: + mutex_unlock(&flash->power_lock); + return ret; +} + +static const struct v4l2_subdev_core_ops lm3554_core_ops = { + .s_power = lm3554_s_power, +}; + +static const struct v4l2_subdev_ops lm3554_ops = { + .core = &lm3554_core_ops, +}; + +static int lm3554_detect(struct v4l2_subdev *sd) +{ + struct i2c_client *client = v4l2_get_subdevdata(sd); + struct i2c_adapter *adapter = client->adapter; + struct lm3554 *flash = to_lm3554(sd); + int ret; + + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) { + dev_err(&client->dev, "lm3554_detect i2c error\n"); + return -ENODEV; + } + + /* Power up the flash driver and reset it */ + ret = lm3554_s_power(&flash->sd, 1); + if (ret < 0) { + dev_err(&client->dev, "Failed to power on lm3554 LED flash\n"); + } else { + dev_dbg(&client->dev, "Successfully detected lm3554 LED flash\n"); + lm3554_s_power(&flash->sd, 0); + } + + return ret; +} + +static int lm3554_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh) +{ + return lm3554_s_power(sd, 1); +} + +static int lm3554_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh) +{ + return lm3554_s_power(sd, 0); +} + +static const struct v4l2_subdev_internal_ops lm3554_internal_ops = { + .registered = lm3554_detect, + .open = lm3554_open, + .close = lm3554_close, +}; + +/* ----------------------------------------------------------------------------- + * I2C driver + */ +#ifdef CONFIG_PM + +static int lm3554_suspend(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct v4l2_subdev *subdev = i2c_get_clientdata(client); + struct lm3554 *flash = to_lm3554(subdev); + int rval; + + if (flash->power_count == 0) + return 0; + + rval = __lm3554_s_power(flash, 0); + + dev_dbg(&client->dev, "Suspend %s\n", rval < 0 ? "failed" : "ok"); + + return rval; +} + +static int lm3554_resume(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct v4l2_subdev *subdev = i2c_get_clientdata(client); + struct lm3554 *flash = to_lm3554(subdev); + int rval; + + if (flash->power_count == 0) + return 0; + + rval = __lm3554_s_power(flash, 1); + + dev_dbg(&client->dev, "Resume %s\n", rval < 0 ? "fail" : "ok"); + + return rval; +} + +#else + +#define lm3554_suspend NULL +#define lm3554_resume NULL + +#endif /* CONFIG_PM */ + +static int lm3554_gpio_init(struct i2c_client *client) +{ + struct v4l2_subdev *sd = i2c_get_clientdata(client); + struct lm3554 *flash = to_lm3554(sd); + struct lm3554_platform_data *pdata = flash->pdata; + int ret; + + if (!gpio_is_valid(pdata->gpio_reset)) + return -EINVAL; + + ret = gpio_direction_output(pdata->gpio_reset, 0); + if (ret < 0) + goto err_gpio_reset; + dev_info(&client->dev, "flash led reset successfully\n"); + + if (!gpio_is_valid(pdata->gpio_strobe)) { + ret = -EINVAL; + goto err_gpio_dir_reset; + } + + ret = gpio_direction_output(pdata->gpio_strobe, 0); + if (ret < 0) + goto err_gpio_strobe; + + return 0; + +err_gpio_strobe: + gpio_free(pdata->gpio_strobe); +err_gpio_dir_reset: + gpio_direction_output(pdata->gpio_reset, 0); +err_gpio_reset: + gpio_free(pdata->gpio_reset); + + return ret; +} + +static int lm3554_gpio_uninit(struct i2c_client *client) +{ + struct v4l2_subdev *sd = i2c_get_clientdata(client); + struct lm3554 *flash = to_lm3554(sd); + struct lm3554_platform_data *pdata = flash->pdata; + int ret; + + ret = gpio_direction_output(pdata->gpio_strobe, 0); + if (ret < 0) + return ret; + + ret = gpio_direction_output(pdata->gpio_reset, 0); + if (ret < 0) + return ret; + + gpio_free(pdata->gpio_strobe); + gpio_free(pdata->gpio_reset); + return 0; +} + +void *lm3554_platform_data_func(struct i2c_client *client) +{ + static struct lm3554_platform_data platform_data; + + if (ACPI_COMPANION(&client->dev)) { + platform_data.gpio_reset = + desc_to_gpio(gpiod_get_index(&(client->dev), + NULL, 2, GPIOD_OUT_LOW)); + platform_data.gpio_strobe = + desc_to_gpio(gpiod_get_index(&(client->dev), + NULL, 0, GPIOD_OUT_LOW)); + platform_data.gpio_torch = + desc_to_gpio(gpiod_get_index(&(client->dev), + NULL, 1, GPIOD_OUT_LOW)); + } else { + platform_data.gpio_reset = -1; + platform_data.gpio_strobe = -1; + platform_data.gpio_torch = -1; + } + + dev_info(&client->dev, "camera pdata: lm3554: reset: %d strobe %d torch %d\n", + platform_data.gpio_reset, platform_data.gpio_strobe, + platform_data.gpio_torch); + + /* Set to TX2 mode, then ENVM/TX2 pin is a power amplifier sync input: + * ENVM/TX pin asserted, flash forced into torch; + * ENVM/TX pin desserted, flash set back; + */ + platform_data.envm_tx2 = 1; + platform_data.tx2_polarity = 0; + + /* set peak current limit to be 1000mA */ + platform_data.current_limit = 0; + + return &platform_data; +} + +static int lm3554_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + int err = 0; + struct lm3554 *flash; + unsigned int i; + int ret; + + flash = kzalloc(sizeof(*flash), GFP_KERNEL); + if (!flash) { + dev_err(&client->dev, "out of memory\n"); + return -ENOMEM; + } + + flash->pdata = client->dev.platform_data; + + if (!flash->pdata || ACPI_COMPANION(&client->dev)) + flash->pdata = lm3554_platform_data_func(client); + + v4l2_i2c_subdev_init(&flash->sd, client, &lm3554_ops); + flash->sd.internal_ops = &lm3554_internal_ops; + flash->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE; + flash->mode = ATOMISP_FLASH_MODE_OFF; + flash->timeout = LM3554_MAX_TIMEOUT / LM3554_TIMEOUT_STEPSIZE - 1; + ret = + v4l2_ctrl_handler_init(&flash->ctrl_handler, + ARRAY_SIZE(lm3554_controls)); + if (ret) { + dev_err(&client->dev, "error initialize a ctrl_handler.\n"); + goto fail2; + } + + for (i = 0; i < ARRAY_SIZE(lm3554_controls); i++) + v4l2_ctrl_new_custom(&flash->ctrl_handler, &lm3554_controls[i], + NULL); + + if (flash->ctrl_handler.error) { + + dev_err(&client->dev, "ctrl_handler error.\n"); + goto fail2; + } + + flash->sd.ctrl_handler = &flash->ctrl_handler; + err = media_entity_pads_init(&flash->sd.entity, 0, NULL); + if (err) { + dev_err(&client->dev, "error initialize a media entity.\n"); + goto fail1; + } + + flash->sd.entity.function = MEDIA_ENT_F_FLASH; + + mutex_init(&flash->power_lock); + + setup_timer(&flash->flash_off_delay, lm3554_flash_off_delay, + (unsigned long)client); + + err = lm3554_gpio_init(client); + if (err) { + dev_err(&client->dev, "gpio request/direction_output fail"); + goto fail2; + } + if (ACPI_HANDLE(&client->dev)) + err = atomisp_register_i2c_module(&flash->sd, NULL, LED_FLASH); + return 0; +fail2: + media_entity_cleanup(&flash->sd.entity); + v4l2_ctrl_handler_free(&flash->ctrl_handler); +fail1: + v4l2_device_unregister_subdev(&flash->sd); + kfree(flash); + + return err; +} + +static int lm3554_remove(struct i2c_client *client) +{ + struct v4l2_subdev *sd = i2c_get_clientdata(client); + struct lm3554 *flash = to_lm3554(sd); + int ret; + + media_entity_cleanup(&flash->sd.entity); + v4l2_ctrl_handler_free(&flash->ctrl_handler); + v4l2_device_unregister_subdev(sd); + + atomisp_gmin_remove_subdev(sd); + + del_timer_sync(&flash->flash_off_delay); + + ret = lm3554_gpio_uninit(client); + if (ret < 0) + goto fail; + + kfree(flash); + + return 0; +fail: + dev_err(&client->dev, "gpio request/direction_output fail"); + return ret; +} + +static const struct i2c_device_id lm3554_id[] = { + {LM3554_NAME, 0}, + {}, +}; + +MODULE_DEVICE_TABLE(i2c, lm3554_id); + +static const struct dev_pm_ops lm3554_pm_ops = { + .suspend = lm3554_suspend, + .resume = lm3554_resume, +}; + +static struct acpi_device_id lm3554_acpi_match[] = { + { "INTCF1C" }, + {}, +}; + +MODULE_DEVICE_TABLE(acpi, lm3554_acpi_match); + +static struct i2c_driver lm3554_driver = { + .driver = { + .name = LM3554_NAME, + .pm = &lm3554_pm_ops, + .acpi_match_table = ACPI_PTR(lm3554_acpi_match), + }, + .probe = lm3554_probe, + .remove = lm3554_remove, + .id_table = lm3554_id, +}; + +static __init int init_lm3554(void) +{ + return i2c_add_driver(&lm3554_driver); +} + +static __exit void exit_lm3554(void) +{ + i2c_del_driver(&lm3554_driver); +} + +module_init(init_lm3554); +module_exit(exit_lm3554); +MODULE_AUTHOR("Jing Tao <jing.tao@intel.com>"); +MODULE_DESCRIPTION("LED flash driver for LM3554"); +MODULE_LICENSE("GPL"); |
