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linux/drivers/leds/flash/leds-qcom-flash.c
Uwe Kleine-König 6061302092 leds: Convert all platform drivers to return void 
The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is ignored (apart
from emitting a warning) and this typically results in resource leaks.
To improve here there is a quest to make the remove callback return
void. In the first step of this quest all drivers are converted to
.remove_new() which already returns void. Eventually after all drivers
are converted, .remove_new() is renamed to .remove().

All platform drivers below drivers/leds/ unconditionally return zero in
their remove callback and so can be converted trivially to the variant
returning void.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20230917130947.1122198-1-u.kleine-koenig@pengutronix.de
Signed-off-by: Lee Jones <lee@kernel.org>
2023-11-01 11:28:35 +00:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved.
*/
#include <linux/bitfield.h>
#include <linux/bits.h>
#include <linux/leds.h>
#include <linux/led-class-flash.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/property.h>
#include <linux/regmap.h>
#include <media/v4l2-flash-led-class.h>
/* registers definitions */
#define FLASH_TYPE_REG 0x04
#define FLASH_TYPE_VAL 0x18
#define FLASH_SUBTYPE_REG 0x05
#define FLASH_SUBTYPE_3CH_PM8150_VAL 0x04
#define FLASH_SUBTYPE_3CH_PMI8998_VAL 0x03
#define FLASH_SUBTYPE_4CH_VAL 0x07
#define FLASH_STS_3CH_OTST1 BIT(0)
#define FLASH_STS_3CH_OTST2 BIT(1)
#define FLASH_STS_3CH_OTST3 BIT(2)
#define FLASH_STS_3CH_BOB_THM_OVERLOAD BIT(3)
#define FLASH_STS_3CH_VPH_DROOP BIT(4)
#define FLASH_STS_3CH_BOB_ILIM_S1 BIT(5)
#define FLASH_STS_3CH_BOB_ILIM_S2 BIT(6)
#define FLASH_STS_3CH_BCL_IBAT BIT(7)
#define FLASH_STS_4CH_VPH_LOW BIT(0)
#define FLASH_STS_4CH_BCL_IBAT BIT(1)
#define FLASH_STS_4CH_BOB_ILIM_S1 BIT(2)
#define FLASH_STS_4CH_BOB_ILIM_S2 BIT(3)
#define FLASH_STS_4CH_OTST2 BIT(4)
#define FLASH_STS_4CH_OTST1 BIT(5)
#define FLASH_STS_4CHG_BOB_THM_OVERLOAD BIT(6)
#define FLASH_TIMER_EN_BIT BIT(7)
#define FLASH_TIMER_VAL_MASK GENMASK(6, 0)
#define FLASH_TIMER_STEP_MS 10
#define FLASH_STROBE_HW_SW_SEL_BIT BIT(2)
#define SW_STROBE_VAL 0
#define HW_STROBE_VAL 1
#define FLASH_HW_STROBE_TRIGGER_SEL_BIT BIT(1)
#define STROBE_LEVEL_TRIGGER_VAL 0
#define STROBE_EDGE_TRIGGER_VAL 1
#define FLASH_STROBE_POLARITY_BIT BIT(0)
#define STROBE_ACTIVE_HIGH_VAL 1
#define FLASH_IRES_MASK_4CH BIT(0)
#define FLASH_IRES_MASK_3CH GENMASK(1, 0)
#define FLASH_IRES_12P5MA_VAL 0
#define FLASH_IRES_5MA_VAL_4CH 1
#define FLASH_IRES_5MA_VAL_3CH 3
/* constants */
#define FLASH_CURRENT_MAX_UA 1500000
#define TORCH_CURRENT_MAX_UA 500000
#define FLASH_TOTAL_CURRENT_MAX_UA 2000000
#define FLASH_CURRENT_DEFAULT_UA 1000000
#define TORCH_CURRENT_DEFAULT_UA 200000
#define TORCH_IRES_UA 5000
#define FLASH_IRES_UA 12500
#define FLASH_TIMEOUT_MAX_US 1280000
#define FLASH_TIMEOUT_STEP_US 10000
#define UA_PER_MA 1000
enum hw_type {
QCOM_MVFLASH_3CH,
QCOM_MVFLASH_4CH,
};
enum led_mode {
FLASH_MODE,
TORCH_MODE,
};
enum led_strobe {
SW_STROBE,
HW_STROBE,
};
enum {
REG_STATUS1,
REG_STATUS2,
REG_STATUS3,
REG_CHAN_TIMER,
REG_ITARGET,
REG_MODULE_EN,
REG_IRESOLUTION,
REG_CHAN_STROBE,
REG_CHAN_EN,
REG_MAX_COUNT,
};
static struct reg_field mvflash_3ch_regs[REG_MAX_COUNT] = {
REG_FIELD(0x08, 0, 7), /* status1 */
REG_FIELD(0x09, 0, 7), /* status2 */
REG_FIELD(0x0a, 0, 7), /* status3 */
REG_FIELD_ID(0x40, 0, 7, 3, 1), /* chan_timer */
REG_FIELD_ID(0x43, 0, 6, 3, 1), /* itarget */
REG_FIELD(0x46, 7, 7), /* module_en */
REG_FIELD(0x47, 0, 5), /* iresolution */
REG_FIELD_ID(0x49, 0, 2, 3, 1), /* chan_strobe */
REG_FIELD(0x4c, 0, 2), /* chan_en */
};
static struct reg_field mvflash_4ch_regs[REG_MAX_COUNT] = {
REG_FIELD(0x06, 0, 7), /* status1 */
REG_FIELD(0x07, 0, 6), /* status2 */
REG_FIELD(0x09, 0, 7), /* status3 */
REG_FIELD_ID(0x3e, 0, 7, 4, 1), /* chan_timer */
REG_FIELD_ID(0x42, 0, 6, 4, 1), /* itarget */
REG_FIELD(0x46, 7, 7), /* module_en */
REG_FIELD(0x49, 0, 3), /* iresolution */
REG_FIELD_ID(0x4a, 0, 6, 4, 1), /* chan_strobe */
REG_FIELD(0x4e, 0, 3), /* chan_en */
};
struct qcom_flash_data {
struct v4l2_flash **v4l2_flash;
struct regmap_field *r_fields[REG_MAX_COUNT];
struct mutex lock;
enum hw_type hw_type;
u8 leds_count;
u8 max_channels;
u8 chan_en_bits;
};
struct qcom_flash_led {
struct qcom_flash_data *flash_data;
struct led_classdev_flash flash;
u32 max_flash_current_ma;
u32 max_torch_current_ma;
u32 max_timeout_ms;
u32 flash_current_ma;
u32 flash_timeout_ms;
u8 *chan_id;
u8 chan_count;
bool enabled;
};
static int set_flash_module_en(struct qcom_flash_led *led, bool en)
{
struct qcom_flash_data *flash_data = led->flash_data;
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(&flash_data->lock);
if (en)
flash_data->chan_en_bits |= led_mask;
else
flash_data->chan_en_bits &= ~led_mask;
enable = !!flash_data->chan_en_bits;
rc = regmap_field_write(flash_data->r_fields[REG_MODULE_EN], enable);
if (rc)
dev_err(led->flash.led_cdev.dev, "write module_en failed, rc=%d\n", rc);
mutex_unlock(&flash_data->lock);
return rc;
}
static int set_flash_current(struct qcom_flash_led *led, u32 current_ma, enum led_mode mode)
{
struct qcom_flash_data *flash_data = led->flash_data;
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(flash_data->r_fields[REG_ITARGET], chan_id, itarget);
if (rc)
return rc;
if (flash_data->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 (flash_data->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(led->flash.led_cdev.dev,
"HW type %d is not supported\n", flash_data->hw_type);
return -EOPNOTSUPP;
}
}
return regmap_field_update_bits(flash_data->r_fields[REG_IRESOLUTION], ires_mask, ires_val);
}
static int set_flash_timeout(struct qcom_flash_led *led, u32 timeout_ms)
{
struct qcom_flash_data *flash_data = led->flash_data;
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(flash_data->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_data *flash_data = led->flash_data;
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(
flash_data->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(flash_data->r_fields[REG_CHAN_EN], chan_mask, chan_en);
if (rc)
return rc;
led->enabled = state;
return 0;
}
static inline struct qcom_flash_led *flcdev_to_qcom_fled(struct led_classdev_flash *flcdev)
{
return container_of(flcdev, struct qcom_flash_led, flash);
}
static int qcom_flash_brightness_set(struct led_classdev_flash *fled_cdev, u32 brightness)
{
struct qcom_flash_led *led = flcdev_to_qcom_fled(fled_cdev);
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 = flcdev_to_qcom_fled(fled_cdev);
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 = flcdev_to_qcom_fled(fled_cdev);
int rc;
rc = set_flash_strobe(led, SW_STROBE, false);
if (rc)
return 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 = flcdev_to_qcom_fled(fled_cdev);
*state = led->enabled;
return 0;
}
static int qcom_flash_fault_get(struct led_classdev_flash *fled_cdev, u32 *fault)
{
struct qcom_flash_led *led = flcdev_to_qcom_fled(fled_cdev);
struct qcom_flash_data *flash_data = led->flash_data;
u8 shift, chan_id, chan_mask = 0;
u8 ot_mask = 0, oc_mask = 0, uv_mask = 0;
u32 val, fault_sts = 0;
int i, rc;
rc = regmap_field_read(flash_data->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(flash_data->r_fields[REG_STATUS2], &val);
if (rc)
return rc;
if (flash_data->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 (flash_data->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(flash_data->r_fields[REG_STATUS3], &val);
if (rc)
return rc;
if (flash_data->hw_type == QCOM_MVFLASH_3CH) {
if (val & chan_mask)
fault_sts |= LED_FAULT_TIMEOUT;
} else if (flash_data->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 = lcdev_to_flcdev(led_cdev);
struct qcom_flash_led *led = flcdev_to_qcom_fled(fled_cdev);
u32 current_ma = brightness * led->max_torch_current_ma / LED_FULL;
bool enable = !!brightness;
int rc;
rc = set_flash_strobe(led, SW_STROBE, false);
if (rc)
return rc;
rc = set_flash_module_en(led, false);
if (rc)
return 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 *fled_cdev = v4l2_flash->fled_cdev;
struct qcom_flash_led *led = flcdev_to_qcom_fled(fled_cdev);
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 *fled_cdev = v4l2_flash->fled_cdev;
struct qcom_flash_led *led = flcdev_to_qcom_fled(fled_cdev);
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 *fled_cdev = v4l2_flash->fled_cdev;
struct qcom_flash_led *led = flcdev_to_qcom_fled(fled_cdev);
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 device *dev, struct qcom_flash_led *led, struct fwnode_handle *fwnode)
{
struct qcom_flash_data *flash_data = led->flash_data;
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;
flash_data->v4l2_flash[flash_data->leds_count] =
v4l2_flash_init(dev, fwnode, &led->flash, &qcom_v4l2_flash_ops, &v4l2_cfg);
return PTR_ERR_OR_ZERO(flash_data->v4l2_flash);
}
# else
static int
qcom_flash_v4l2_init(struct device *dev, struct qcom_flash_led *led, struct fwnode_handle *fwnode)
{
return 0;
}
#endif
static int qcom_flash_register_led_device(struct device *dev,
struct fwnode_handle *node, struct qcom_flash_led *led)
{
struct qcom_flash_data *flash_data = led->flash_data;
struct led_init_data init_data;
struct led_classdev_flash *flash = &led->flash;
struct led_flash_setting *brightness, *timeout;
u32 current_ua, timeout_us;
u32 channels[4];
int i, rc, count;
count = fwnode_property_count_u32(node, "led-sources");
if (count <= 0) {
dev_err(dev, "No led-sources specified\n");
return -ENODEV;
}
if (count > flash_data->max_channels) {
dev_err(dev, "led-sources count %u exceeds maximum channel count %u\n",
count, flash_data->max_channels);
return -EINVAL;
}
rc = fwnode_property_read_u32_array(node, "led-sources", channels, count);
if (rc < 0) {
dev_err(dev, "Failed to read led-sources property, rc=%d\n", rc);
return rc;
}
led->chan_count = count;
led->chan_id = devm_kcalloc(dev, count, sizeof(u8), GFP_KERNEL);
if (!led->chan_id)
return -ENOMEM;
for (i = 0; i < count; i++) {
if ((channels[i] == 0) || (channels[i] > flash_data->max_channels)) {
dev_err(dev, "led-source out of HW support range [1-%u]\n",
flash_data->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", &current_ua);
if (rc < 0) {
dev_err(dev, "Failed to read led-max-microamp property, rc=%d\n", rc);
return rc;
}
if (current_ua == 0) {
dev_err(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", &current_ua);
if (rc < 0) {
dev_err(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(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(dev, flash, &init_data);
if (rc < 0) {
dev_err(dev, "Register flash LED classdev failed, rc=%d\n", rc);
return rc;
}
return qcom_flash_v4l2_init(dev, led, node);
}
static int qcom_flash_led_probe(struct platform_device *pdev)
{
struct qcom_flash_data *flash_data;
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;
flash_data = devm_kzalloc(dev, sizeof(*flash_data), GFP_KERNEL);
if (!flash_data)
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", &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_PM8150_VAL || val == FLASH_SUBTYPE_3CH_PMI8998_VAL) {
flash_data->hw_type = QCOM_MVFLASH_3CH;
flash_data->max_channels = 3;
regs = mvflash_3ch_regs;
} else if (val == FLASH_SUBTYPE_4CH_VAL) {
flash_data->hw_type = QCOM_MVFLASH_4CH;
flash_data->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, flash_data->r_fields, regs, REG_MAX_COUNT);
if (rc < 0) {
dev_err(dev, "Failed to allocate regmap field, rc=%d\n", rc);
return rc;
}
platform_set_drvdata(pdev, flash_data);
mutex_init(&flash_data->lock);
count = device_get_child_node_count(dev);
if (count == 0 || count > flash_data->max_channels) {
dev_err(dev, "No child or child count exceeds %d\n", flash_data->max_channels);
return -EINVAL;
}
flash_data->v4l2_flash = devm_kcalloc(dev, count,
sizeof(*flash_data->v4l2_flash), GFP_KERNEL);
if (!flash_data->v4l2_flash)
return -ENOMEM;
device_for_each_child_node(dev, child) {
led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL);
if (!led) {
rc = -ENOMEM;
goto release;
}
led->flash_data = flash_data;
rc = qcom_flash_register_led_device(dev, child, led);
if (rc < 0)
goto release;
flash_data->leds_count++;
}
return 0;
release:
fwnode_handle_put(child);
while (flash_data->v4l2_flash[flash_data->leds_count] && flash_data->leds_count)
v4l2_flash_release(flash_data->v4l2_flash[flash_data->leds_count--]);
return rc;
}
static void qcom_flash_led_remove(struct platform_device *pdev)
{
struct qcom_flash_data *flash_data = platform_get_drvdata(pdev);
while (flash_data->v4l2_flash[flash_data->leds_count] && flash_data->leds_count)
v4l2_flash_release(flash_data->v4l2_flash[flash_data->leds_count--]);
mutex_destroy(&flash_data->lock);
}
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_new = qcom_flash_led_remove,
};
module_platform_driver(qcom_flash_led_driver);
MODULE_DESCRIPTION("QCOM Flash LED driver");
MODULE_LICENSE("GPL");
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