+ u8 chan_en_bits;
+};
+
+static inline void *flash_led_get_priv_data(struct qcom_flash_led *led)
+{
+ return led->priv_data;
+}
+
+static int set_flash_module_en(struct qcom_flash_led *led, bool en)
+{
+ struct qcom_flash_chip *chip = flash_led_get_priv_data(led);
+ u8 led_mask = 0, enable;
+ int i, rc;
+
+ for (i = 0; i < led->chan_count; i++)
+ led_mask |= BIT(led->chan_id[i]);
+
+ mutex_lock(&chip->lock);
+ if (en)
+ chip->chan_en_bits |= led_mask;
+ else
+ chip->chan_en_bits &= ~led_mask;
+
+ enable = !!chip->chan_en_bits;
+ rc = regmap_field_write(chip->r_fields[REG_MODULE_EN], enable);
+ if (rc)
+ dev_err(chip->dev, "write module_en failed, rc=%d\n", rc);
+ mutex_unlock(&chip->lock);
+
+ return rc;
+}
+
+static int set_flash_current(struct qcom_flash_led *led, u32 current_ma, enum led_mode mode)
+{
+ struct qcom_flash_chip *chip = flash_led_get_priv_data(led);
+ u32 itarg_ua, ires_ua;
+ u8 shift, ires_mask = 0, ires_val = 0, chan_id;
+ int i, rc;
+
+ /*
+ * Split the current across the channels and set the
+ * IRESOLUTION and ITARGET registers accordingly.
+ */
+ itarg_ua = (current_ma * UA_PER_MA) / led->chan_count + 1;
+ ires_ua = (mode == FLASH_MODE) ? FLASH_IRES_UA : TORCH_IRES_UA;
+
+ for (i = 0; i < led->chan_count; i++) {
+ u8 itarget = 0;
+
+ if (itarg_ua > ires_ua)
+ itarget = itarg_ua / ires_ua - 1;
+
+ chan_id = led->chan_id[i];
+
+ rc = regmap_fields_write(chip->r_fields[REG_ITARGET], chan_id, itarget);
+ if (rc)
+ return rc;
+
+ if (chip->hw_type == QCOM_MVFLASH_3CH) {
+ shift = chan_id * 2;
+ ires_mask |= FLASH_IRES_MASK_3CH << shift;
+ ires_val |= ((mode == FLASH_MODE) ?
+ (FLASH_IRES_12P5MA_VAL << shift) :
+ (FLASH_IRES_5MA_VAL_3CH << shift));
+ } else if (chip->hw_type == QCOM_MVFLASH_4CH) {
+ shift = chan_id;
+ ires_mask |= FLASH_IRES_MASK_4CH << shift;
+ ires_val |= ((mode == FLASH_MODE) ?
+ (FLASH_IRES_12P5MA_VAL << shift) :
+ (FLASH_IRES_5MA_VAL_4CH << shift));
+ } else {
+ dev_err(chip->dev, "HW type %d is not supported\n", chip->hw_type);
+ return -ENOTSUPP;
+ }
+ }
+
+ return regmap_field_update_bits(chip->r_fields[REG_IRESOLUTION], ires_mask, ires_val);
+}
+
+static int set_flash_timeout(struct qcom_flash_led *led, u32 timeout_ms)
+{
+ struct qcom_flash_chip *chip = flash_led_get_priv_data(led);
+ u8 timer, chan_id;
+ int rc, i;
+
+ /* set SAFETY_TIMER for all the channels connected to the same LED */
+ timeout_ms = min_t(u32, timeout_ms, led->max_timeout_ms);
+
+ for (i = 0; i < led->chan_count; i++) {
+ chan_id = led->chan_id[i];
+
+ timer = timeout_ms / FLASH_TIMER_STEP_MS;
+ timer = clamp_t(u8, timer, 0, FLASH_TIMER_VAL_MASK);
+
+ if (timeout_ms)
+ timer |= FLASH_TIMER_EN_BIT;
+
+ rc = regmap_fields_write(chip->r_fields[REG_CHAN_TIMER], chan_id, timer);
+ if (rc)
+ return rc;
+ }
+
+ return 0;
+}
+
+static int set_flash_strobe(struct qcom_flash_led *led, enum led_strobe strobe, bool state)
+{
+ struct qcom_flash_chip *chip = flash_led_get_priv_data(led);
+ u8 strobe_sel, chan_en, chan_id, chan_mask = 0;
+ int rc, i;
+
+ /* Set SW strobe config for all channels connected to the LED */
+ for (i = 0; i < led->chan_count; i++) {
+ chan_id = led->chan_id[i];
+
+ if (strobe == SW_STROBE)
+ strobe_sel = FIELD_PREP(FLASH_STROBE_HW_SW_SEL_BIT, SW_STROBE_VAL);
+ else
+ strobe_sel = FIELD_PREP(FLASH_STROBE_HW_SW_SEL_BIT, HW_STROBE_VAL);
+
+ strobe_sel |=
+ FIELD_PREP(FLASH_HW_STROBE_TRIGGER_SEL_BIT, STROBE_LEVEL_TRIGGER_VAL) |
+ FIELD_PREP(FLASH_STROBE_POLARITY_BIT, STROBE_ACTIVE_HIGH_VAL);
+
+ rc = regmap_fields_write(chip->r_fields[REG_CHAN_STROBE], chan_id, strobe_sel);
+ if (rc)
+ return rc;
+
+ chan_mask |= BIT(chan_id);
+ }
+
+ /* Enable/disable flash channels */
+ chan_en = state ? chan_mask : 0;
+ rc = regmap_field_update_bits(chip->r_fields[REG_CHAN_EN], chan_mask, chan_en);
+ if (rc)
+ return rc;
+
+ led->enabled = state;
+ return 0;
+}
+
+static int qcom_flash_brightness_set(struct led_classdev_flash *fled_cdev, u32 brightness)
+{
+ struct qcom_flash_led *led = container_of(fled_cdev, struct qcom_flash_led, flash);
+
+ led->flash_current_ma = min_t(u32, led->max_flash_current_ma, brightness / UA_PER_MA);
+ return 0;
+}
+
+static int qcom_flash_timeout_set(struct led_classdev_flash *fled_cdev, u32 timeout)
+{
+ struct qcom_flash_led *led = container_of(fled_cdev, struct qcom_flash_led, flash);
+
+ led->flash_timeout_ms = timeout / USEC_PER_MSEC;
+ return 0;
+}
+
+static int qcom_flash_strobe_set(struct led_classdev_flash *fled_cdev, bool state)
+{
+ struct qcom_flash_led *led = container_of(fled_cdev, struct qcom_flash_led, flash);
+ int rc;
+
+ rc = set_flash_current(led, led->flash_current_ma, FLASH_MODE);
+ if (rc)
+ return rc;
+
+ rc = set_flash_timeout(led, led->flash_timeout_ms);
+ if (rc)
+ return rc;
+
+ rc = set_flash_module_en(led, state);
+ if (rc)
+ return rc;
+
+ return set_flash_strobe(led, SW_STROBE, state);
+}
+
+static int qcom_flash_strobe_get(struct led_classdev_flash *fled_cdev, bool *state)
+{
+ struct qcom_flash_led *led = container_of(fled_cdev, struct qcom_flash_led, flash);
+
+ *state = led->enabled;
+ return 0;
+}
+
+static int qcom_flash_fault_get(struct led_classdev_flash *fled_cdev, u32 *fault)
+{
+ struct qcom_flash_led *led = container_of(fled_cdev, struct qcom_flash_led, flash);
+ struct qcom_flash_chip *chip = flash_led_get_priv_data(led);
+ u8 shift, chan_id, chan_mask = 0;
+ u8 ot_mask, oc_mask, uv_mask;
+ u32 val, fault_sts = 0;
+ int i, rc;
+
+ rc = regmap_field_read(chip->r_fields[REG_STATUS1], &val);
+ if (rc)
+ return rc;
+
+ for (i = 0; i < led->chan_count; i++) {
+ chan_id = led->chan_id[i];
+ shift = chan_id * 2;
+
+ if (val & BIT(shift))
+ fault_sts |= LED_FAULT_SHORT_CIRCUIT;
+
+ chan_mask |= BIT(chan_id);
+ }
+
+ rc = regmap_field_read(chip->r_fields[REG_STATUS2], &val);
+ if (rc)
+ return rc;
+
+ if (chip->hw_type == QCOM_MVFLASH_3CH) {
+ ot_mask = FLASH_STS_3CH_OTST1 |
+ FLASH_STS_3CH_OTST2 |
+ FLASH_STS_3CH_OTST3 |
+ FLASH_STS_3CH_BOB_THM_OVERLOAD;
+ oc_mask = FLASH_STS_3CH_BOB_ILIM_S1 |
+ FLASH_STS_3CH_BOB_ILIM_S2 |
+ FLASH_STS_3CH_BCL_IBAT;
+ uv_mask = FLASH_STS_3CH_VPH_DROOP;
+ } else if (chip->hw_type == QCOM_MVFLASH_4CH) {
+ ot_mask = FLASH_STS_4CH_OTST2 |
+ FLASH_STS_4CH_OTST1 |
+ FLASH_STS_4CHG_BOB_THM_OVERLOAD;
+ oc_mask = FLASH_STS_4CH_BCL_IBAT |
+ FLASH_STS_4CH_BOB_ILIM_S1 |
+ FLASH_STS_4CH_BOB_ILIM_S2;
+ uv_mask = FLASH_STS_4CH_VPH_LOW;
+ }
+
+ if (val & ot_mask)
+ fault_sts |= LED_FAULT_OVER_TEMPERATURE;
+
+ if (val & oc_mask)
+ fault_sts |= LED_FAULT_OVER_CURRENT;
+
+ if (val & uv_mask)
+ fault_sts |= LED_FAULT_INPUT_VOLTAGE;
+
+ rc = regmap_field_read(chip->r_fields[REG_STATUS3], &val);
+ if (rc)
+ return rc;
+
+ if (chip->hw_type == QCOM_MVFLASH_3CH) {
+ if (val & chan_mask)
+ fault_sts |= LED_FAULT_TIMEOUT;
+ } else if (chip->hw_type == QCOM_MVFLASH_4CH) {
+ for (i = 0; i < led->chan_count; i++) {
+ chan_id = led->chan_id[i];
+ shift = chan_id * 2;
+
+ if (val & BIT(shift))
+ fault_sts |= LED_FAULT_TIMEOUT;
+ }
+ }
+
+ *fault = fault_sts;
+ return 0;
+}
+
+static int qcom_flash_led_brightness_set(struct led_classdev *led_cdev,
+ enum led_brightness brightness)
+{
+ struct led_classdev_flash *fled_cdev =
+ container_of(led_cdev, struct led_classdev_flash, led_cdev);
+ u32 current_ma = brightness * led->max_torch_current_ma / LED_FULL;
+ bool enable = !!brightness;
+ int rc;
+
+ rc = set_flash_current(led, current_ma, TORCH_MODE);
+ if (rc)
+ return rc;
+
+ /* Disable flash timeout for torch LED */
+ rc = set_flash_timeout(led, 0);
+ if (rc)
+ return rc;
+
+ rc = set_flash_module_en(led, enable);
+ if (rc)
+ return rc;
+
+ return set_flash_strobe(led, SW_STROBE, enable);
+}
+
+static const struct led_flash_ops qcom_flash_ops = {
+ .flash_brightness_set = qcom_flash_brightness_set,
+ .strobe_set = qcom_flash_strobe_set,
+ .strobe_get = qcom_flash_strobe_get,
+ .timeout_set = qcom_flash_timeout_set,
+ .fault_get = qcom_flash_fault_get,
+};
+
+#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
+static int qcom_flash_external_strobe_set(struct v4l2_flash *v4l2_flash, bool enable)
+{
+ struct led_classdev_flash *flash = v4l2_flash->fled_cdev;
+ struct qcom_flash_led *led = container_of(flash, struct qcom_flash_led, flash);
+ int rc;
+
+ rc = set_flash_module_en(led, enable);
+ if (rc)
+ return rc;
+
+ if (enable)
+ return set_flash_strobe(led, HW_STROBE, true);
+ else
+ return set_flash_strobe(led, SW_STROBE, false);
+}
+
+static enum led_brightness
+qcom_flash_intensity_to_led_brightness(struct v4l2_flash *v4l2_flash, s32 intensity)
+{
+ struct led_classdev_flash *flash = v4l2_flash->fled_cdev;
+ struct qcom_flash_led *led = container_of(flash, struct qcom_flash_led, flash);
+ u32 current_ma = intensity / UA_PER_MA;
+
+ current_ma = min_t(u32, current_ma, led->max_torch_current_ma);
+ if (!current_ma)
+ return LED_OFF;
+
+ return (current_ma * LED_FULL) / led->max_torch_current_ma;
+}
+
+static s32 qcom_flash_brightness_to_led_intensity(struct v4l2_flash *v4l2_flash,
+ enum led_brightness brightness)
+{
+ struct led_classdev_flash *flash = v4l2_flash->fled_cdev;
+ struct qcom_flash_led *led = container_of(flash, struct qcom_flash_led, flash);
+
+ return (brightness * led->max_torch_current_ma * UA_PER_MA) / LED_FULL;
+}
+
+static const struct v4l2_flash_ops qcom_v4l2_flash_ops = {
+ .external_strobe_set = qcom_flash_external_strobe_set,
+ .intensity_to_led_brightness = qcom_flash_intensity_to_led_brightness,
+ .led_brightness_to_intensity = qcom_flash_brightness_to_led_intensity,
+};
+
+static int qcom_flash_v4l2_init(struct qcom_flash_led *led, struct fwnode_handle *fwnode)
+{
+ struct qcom_flash_chip *chip = flash_led_get_priv_data(led);
+ struct v4l2_flash_config v4l2_cfg = { 0 };
+ struct led_flash_setting *intensity = &v4l2_cfg.intensity;
+
+ if (!(led->flash.led_cdev.flags & LED_DEV_CAP_FLASH))
+ return 0;
+
+ intensity->min = intensity->step = TORCH_IRES_UA * led->chan_count;
+ intensity->max = led->max_torch_current_ma * UA_PER_MA;
+ intensity->val = min_t(u32, intensity->max, TORCH_CURRENT_DEFAULT_UA);
+
+ strscpy(v4l2_cfg.dev_name, led->flash.led_cdev.dev->kobj.name,
+ sizeof(v4l2_cfg.dev_name));
+
+ v4l2_cfg.has_external_strobe = true;
+ v4l2_cfg.flash_faults = LED_FAULT_INPUT_VOLTAGE |
+ LED_FAULT_OVER_CURRENT |
+ LED_FAULT_SHORT_CIRCUIT |
+ LED_FAULT_OVER_TEMPERATURE |
+ LED_FAULT_TIMEOUT;
+
+ led->v4l2_flash = v4l2_flash_init(chip->dev, fwnode, &led->flash,
+ &qcom_v4l2_flash_ops, &v4l2_cfg);
+ return PTR_ERR_OR_ZERO(led->v4l2_flash);
+}
+# else
+static int qcom_flash_v4l2_init(struct qcom_flash_led *led, struct fwnode_handle *fwnode)
+{
+ return 0;
+}
+#endif
+
+static int qcom_flash_register_led_device(struct device *parent,
+ struct fwnode_handle *node, struct qcom_flash_led *led)
+{
+ struct qcom_flash_chip *chip = flash_led_get_priv_data(led);
+ struct led_init_data init_data;
+ struct led_classdev_flash *flash = &led->flash;
+ struct led_flash_setting *brightness, *timeout;
+ u32 count, current_ua, timeout_us;
+ u32 channels[4];
+ int i, rc;
+
+ count = fwnode_property_count_u32(node, "led-sources");
+ if (count <= 0) {
+ dev_err(chip->dev, "No led-sources specified\n");
+ return -ENODEV;
+ }
+
+ if (count > chip->max_channels) {
+ dev_err(chip->dev, "led-sources count %u exceeds maximum channel count %u\n",
+ count, chip->max_channels);
+ return -EINVAL;
+ }
+
+ rc = fwnode_property_read_u32_array(node, "led-sources", channels, count);
+ if (rc < 0) {
+ dev_err(chip->dev, "Failed to read led-sources property, rc=%d\n", rc);
+ return rc;
+ }
+
+ led->chan_count = count;
+ led->chan_id = devm_kcalloc(chip->dev, count, sizeof(u8), GFP_KERNEL);
+ if (!led->chan_id)
+ return -ENOMEM;
+
+ for (i = 0; i < count; i++) {
+ if ((channels[i] == 0) || (channels[i] > chip->max_channels)) {
+ dev_err(chip->dev, "led-source out of HW support range [1-%u]\n",
+ chip->max_channels);
+ return -EINVAL;
+ }
+
+ /* Make chan_id indexing from 0 */
+ led->chan_id[i] = channels[i] - 1;
+ }
+
+ rc = fwnode_property_read_u32(node, "led-max-microamp", ¤t_ua);
+ if (rc < 0) {
+ dev_err(chip->dev, "Failed to read led-max-microamp property, rc=%d\n", rc);
+ return rc;
+ }
+
+ if (current_ua == 0) {
+ dev_err(chip->dev, "led-max-microamp shouldn't be 0\n");
+ return -EINVAL;
+ }
+
+ current_ua = min_t(u32, current_ua, TORCH_CURRENT_MAX_UA * led->chan_count);
+ led->max_torch_current_ma = current_ua / UA_PER_MA;
+
+ if (fwnode_property_present(node, "flash-max-microamp")) {
+ flash->led_cdev.flags |= LED_DEV_CAP_FLASH;
+
+ rc = fwnode_property_read_u32(node, "flash-max-microamp", ¤t_ua);
+ if (rc < 0) {
+ dev_err(chip->dev, "Failed to read flash-max-microamp property, rc=%d\n",
+ rc);
+ return rc;
+ }
+
+ current_ua = min_t(u32, current_ua, FLASH_CURRENT_MAX_UA * led->chan_count);
+ current_ua = min_t(u32, current_ua, FLASH_TOTAL_CURRENT_MAX_UA);
+
+ /* Initialize flash class LED device brightness settings */
+ brightness = &flash->brightness;
+ brightness->min = brightness->step = FLASH_IRES_UA * led->chan_count;
+ brightness->max = current_ua;
+ brightness->val = min_t(u32, current_ua, FLASH_CURRENT_DEFAULT_UA);
+
+ led->max_flash_current_ma = current_ua / UA_PER_MA;
+ led->flash_current_ma = brightness->val / UA_PER_MA;
+
+ rc = fwnode_property_read_u32(node, "flash-max-timeout-us", &timeout_us);
+ if (rc < 0) {
+ dev_err(chip->dev, "Failed to read flash-max-timeout-us property, rc=%d\n",
+ rc);
+ return rc;
+ }
+
+ timeout_us = min_t(u32, timeout_us, FLASH_TIMEOUT_MAX_US);
+
+ /* Initialize flash class LED device timeout settings */
+ timeout = &flash->timeout;
+ timeout->min = timeout->step = FLASH_TIMEOUT_STEP_US;
+ timeout->val = timeout->max = timeout_us;
+
+ led->max_timeout_ms = led->flash_timeout_ms = timeout_us / USEC_PER_MSEC;
+
+ flash->ops = &qcom_flash_ops;
+ }
+
+ flash->led_cdev.brightness_set_blocking = qcom_flash_led_brightness_set;
+
+ init_data.fwnode = node;
+ init_data.devicename = NULL;
+ init_data.default_label = NULL;
+ init_data.devname_mandatory = false;
+
+ rc = devm_led_classdev_flash_register_ext(parent, flash, &init_data);
+ if (rc < 0) {
+ dev_err(chip->dev, "Register flash LED classdev failed, rc=%d\n", rc);
+ return rc;
+ }
+
+ return qcom_flash_v4l2_init(led, node);
+}
+
+static int qcom_flash_led_probe(struct platform_device *pdev)
+{
+ struct qcom_flash_chip *chip;
+ struct qcom_flash_led *led;
+ struct fwnode_handle *child;
+ struct device *dev = &pdev->dev;
+ struct regmap *regmap;
+ struct reg_field *regs;
+ int count, i, rc;
+ u32 val, reg_base;
+
+ chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
+ if (!chip)
+ return -ENOMEM;
+
+ regmap = dev_get_regmap(dev->parent, NULL);
+ if (!regmap) {
+ dev_err(dev, "Failed to get parent regmap\n");
+ return -EINVAL;
+ }
+
+ rc = fwnode_property_read_u32(dev->fwnode, "reg", ®_base);
+ if (rc < 0) {
+ dev_err(dev, "Failed to get register base address, rc=%d\n", rc);
+ return rc;
+ }
+
+ rc = regmap_read(regmap, reg_base + FLASH_TYPE_REG, &val);
+ if (rc < 0) {
+ dev_err(dev, "Read flash LED module type failed, rc=%d\n", rc);
+ return rc;
+ }
+
+ if (val != FLASH_TYPE_VAL) {
+ dev_err(dev, "type %#x is not a flash LED module\n", val);
+ return -ENODEV;
+ }
+
+ rc = regmap_read(regmap, reg_base + FLASH_SUBTYPE_REG, &val);
+ if (rc < 0) {
+ dev_err(dev, "Read flash LED module subtype failed, rc=%d\n", rc);
+ return rc;
+ }
+
+ if (val == FLASH_SUBTYPE_3CH_VAL) {
+ chip->hw_type = QCOM_MVFLASH_3CH;
+ chip->max_channels = 3;
+ regs = mvflash_3ch_regs;
+ } else if (val == FLASH_SUBTYPE_4CH_VAL) {
+ chip->hw_type = QCOM_MVFLASH_4CH;
+ chip->max_channels = 4;
+ regs = mvflash_4ch_regs;
+ } else {
+ dev_err(dev, "flash LED subtype %#x is not yet supported\n", val);
+ return -ENODEV;
+ }
+
+ for (i = 0; i < REG_MAX_COUNT; i++)
+ regs[i].reg += reg_base;
+
+ rc = devm_regmap_field_bulk_alloc(dev, regmap, chip->r_fields, regs, REG_MAX_COUNT);
+ if (rc < 0) {
+ dev_err(dev, "Failed to allocate regmap field, rc=%d\n", rc);
+ return rc;
+ }
+
+ chip->dev = dev;
+ platform_set_drvdata(pdev, chip);
+ mutex_init(&chip->lock);
+
+ count = device_get_child_node_count(dev);
+ if (count == 0 || count > chip->max_channels) {
+ dev_err(dev, "No child or child count exceeds %d\n", chip->max_channels);
+ return -EINVAL;
+ }
+
+ chip->leds = devm_kcalloc(dev, count, sizeof(*chip->leds), GFP_KERNEL);
+ if (!chip->leds)
+ return -ENOMEM;
+
+ device_for_each_child_node(dev, child) {
+ led = &chip->leds[chip->leds_count];
+ led->priv_data = chip;
+
+ rc = qcom_flash_register_led_device(dev, child, led);
+ if (rc < 0)
+ goto release;
+
+ chip->leds_count++;
+ }
+
+ return 0;
+
+release:
+ while (chip->leds && chip->leds_count--)
+ v4l2_flash_release(chip->leds[chip->leds_count].v4l2_flash);
+ return rc;
+}
+
+static int qcom_flash_led_remove(struct platform_device *pdev)
+{
+ struct qcom_flash_chip *chip = platform_get_drvdata(pdev);
+
+ while (chip->leds_count--)
+ v4l2_flash_release(chip->leds[chip->leds_count].v4l2_flash);
+
+ mutex_destroy(&chip->lock);
+ return 0;
+}
+
+static const struct of_device_id qcom_flash_led_match_table[] = {
+ { .compatible = "qcom,spmi-flash-led" },
+ { }
+};
+
+MODULE_DEVICE_TABLE(of, qcom_flash_led_match_table);
+static struct platform_driver qcom_flash_led_driver = {
+ .driver = {
+ .name = "leds-qcom-flash",
+ .of_match_table = qcom_flash_led_match_table,
+ },
+ .probe = qcom_flash_led_probe,
+ .remove = qcom_flash_led_remove,
+};
+
+module_platform_driver(qcom_flash_led_driver);
+
+MODULE_DESCRIPTION("QCOM Flash LED driver");
+MODULE_LICENSE("GPL");
--
2.25.1
