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0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * drivers/leds/leds-as3645a.c - AS3645A and LM3555 flash controllers driver
0004  *
0005  * Copyright (C) 2008-2011 Nokia Corporation
0006  * Copyright (c) 2011, 2017 Intel Corporation.
0007  *
0008  * Based on drivers/media/i2c/as3645a.c.
0009  *
0010  * Contact: Sakari Ailus <sakari.ailus@iki.fi>
0011  */
0012 
0013 #include <linux/delay.h>
0014 #include <linux/gpio/consumer.h>
0015 #include <linux/i2c.h>
0016 #include <linux/led-class-flash.h>
0017 #include <linux/leds.h>
0018 #include <linux/module.h>
0019 #include <linux/mutex.h>
0020 #include <linux/property.h>
0021 #include <linux/slab.h>
0022 
0023 #include <media/v4l2-flash-led-class.h>
0024 
0025 #define AS_TIMER_US_TO_CODE(t)          (((t) / 1000 - 100) / 50)
0026 #define AS_TIMER_CODE_TO_US(c)          ((50 * (c) + 100) * 1000)
0027 
0028 /* Register definitions */
0029 
0030 /* Read-only Design info register: Reset state: xxxx 0001 */
0031 #define AS_DESIGN_INFO_REG          0x00
0032 #define AS_DESIGN_INFO_FACTORY(x)       (((x) >> 4))
0033 #define AS_DESIGN_INFO_MODEL(x)         ((x) & 0x0f)
0034 
0035 /* Read-only Version control register: Reset state: 0000 0000
0036  * for first engineering samples
0037  */
0038 #define AS_VERSION_CONTROL_REG          0x01
0039 #define AS_VERSION_CONTROL_RFU(x)       (((x) >> 4))
0040 #define AS_VERSION_CONTROL_VERSION(x)       ((x) & 0x0f)
0041 
0042 /* Read / Write (Indicator and timer register): Reset state: 0000 1111 */
0043 #define AS_INDICATOR_AND_TIMER_REG      0x02
0044 #define AS_INDICATOR_AND_TIMER_TIMEOUT_SHIFT    0
0045 #define AS_INDICATOR_AND_TIMER_VREF_SHIFT   4
0046 #define AS_INDICATOR_AND_TIMER_INDICATOR_SHIFT  6
0047 
0048 /* Read / Write (Current set register): Reset state: 0110 1001 */
0049 #define AS_CURRENT_SET_REG          0x03
0050 #define AS_CURRENT_ASSIST_LIGHT_SHIFT       0
0051 #define AS_CURRENT_LED_DET_ON           (1 << 3)
0052 #define AS_CURRENT_FLASH_CURRENT_SHIFT      4
0053 
0054 /* Read / Write (Control register): Reset state: 1011 0100 */
0055 #define AS_CONTROL_REG              0x04
0056 #define AS_CONTROL_MODE_SETTING_SHIFT       0
0057 #define AS_CONTROL_STROBE_ON            (1 << 2)
0058 #define AS_CONTROL_OUT_ON           (1 << 3)
0059 #define AS_CONTROL_EXT_TORCH_ON         (1 << 4)
0060 #define AS_CONTROL_STROBE_TYPE_EDGE     (0 << 5)
0061 #define AS_CONTROL_STROBE_TYPE_LEVEL        (1 << 5)
0062 #define AS_CONTROL_COIL_PEAK_SHIFT      6
0063 
0064 /* Read only (D3 is read / write) (Fault and info): Reset state: 0000 x000 */
0065 #define AS_FAULT_INFO_REG           0x05
0066 #define AS_FAULT_INFO_INDUCTOR_PEAK_LIMIT   (1 << 1)
0067 #define AS_FAULT_INFO_INDICATOR_LED     (1 << 2)
0068 #define AS_FAULT_INFO_LED_AMOUNT        (1 << 3)
0069 #define AS_FAULT_INFO_TIMEOUT           (1 << 4)
0070 #define AS_FAULT_INFO_OVER_TEMPERATURE      (1 << 5)
0071 #define AS_FAULT_INFO_SHORT_CIRCUIT     (1 << 6)
0072 #define AS_FAULT_INFO_OVER_VOLTAGE      (1 << 7)
0073 
0074 /* Boost register */
0075 #define AS_BOOST_REG                0x0d
0076 #define AS_BOOST_CURRENT_DISABLE        (0 << 0)
0077 #define AS_BOOST_CURRENT_ENABLE         (1 << 0)
0078 
0079 /* Password register is used to unlock boost register writing */
0080 #define AS_PASSWORD_REG             0x0f
0081 #define AS_PASSWORD_UNLOCK_VALUE        0x55
0082 
0083 #define AS_NAME                 "as3645a"
0084 #define AS_I2C_ADDR             (0x60 >> 1) /* W:0x60, R:0x61 */
0085 
0086 #define AS_FLASH_TIMEOUT_MIN            100000  /* us */
0087 #define AS_FLASH_TIMEOUT_MAX            850000
0088 #define AS_FLASH_TIMEOUT_STEP           50000
0089 
0090 #define AS_FLASH_INTENSITY_MIN          200000  /* uA */
0091 #define AS_FLASH_INTENSITY_MAX_1LED     500000
0092 #define AS_FLASH_INTENSITY_MAX_2LEDS        400000
0093 #define AS_FLASH_INTENSITY_STEP         20000
0094 
0095 #define AS_TORCH_INTENSITY_MIN          20000   /* uA */
0096 #define AS_TORCH_INTENSITY_MAX          160000
0097 #define AS_TORCH_INTENSITY_STEP         20000
0098 
0099 #define AS_INDICATOR_INTENSITY_MIN      0   /* uA */
0100 #define AS_INDICATOR_INTENSITY_MAX      10000
0101 #define AS_INDICATOR_INTENSITY_STEP     2500
0102 
0103 #define AS_PEAK_mA_MAX              2000
0104 #define AS_PEAK_mA_TO_REG(a) \
0105     ((min_t(u32, AS_PEAK_mA_MAX, a) - 1250) / 250)
0106 
0107 /* LED numbers for Devicetree */
0108 #define AS_LED_FLASH                0
0109 #define AS_LED_INDICATOR            1
0110 
0111 enum as_mode {
0112     AS_MODE_EXT_TORCH = 0 << AS_CONTROL_MODE_SETTING_SHIFT,
0113     AS_MODE_INDICATOR = 1 << AS_CONTROL_MODE_SETTING_SHIFT,
0114     AS_MODE_ASSIST = 2 << AS_CONTROL_MODE_SETTING_SHIFT,
0115     AS_MODE_FLASH = 3 << AS_CONTROL_MODE_SETTING_SHIFT,
0116 };
0117 
0118 struct as3645a_config {
0119     u32 flash_timeout_us;
0120     u32 flash_max_ua;
0121     u32 assist_max_ua;
0122     u32 indicator_max_ua;
0123     u32 voltage_reference;
0124     u32 peak;
0125 };
0126 
0127 struct as3645a {
0128     struct i2c_client *client;
0129 
0130     struct mutex mutex;
0131 
0132     struct led_classdev_flash fled;
0133     struct led_classdev iled_cdev;
0134 
0135     struct v4l2_flash *vf;
0136     struct v4l2_flash *vfind;
0137 
0138     struct fwnode_handle *flash_node;
0139     struct fwnode_handle *indicator_node;
0140 
0141     struct as3645a_config cfg;
0142 
0143     enum as_mode mode;
0144     unsigned int timeout;
0145     unsigned int flash_current;
0146     unsigned int assist_current;
0147     unsigned int indicator_current;
0148     enum v4l2_flash_strobe_source strobe_source;
0149 };
0150 
0151 #define fled_to_as3645a(__fled) container_of(__fled, struct as3645a, fled)
0152 #define iled_cdev_to_as3645a(__iled_cdev) \
0153     container_of(__iled_cdev, struct as3645a, iled_cdev)
0154 
0155 /* Return negative errno else zero on success */
0156 static int as3645a_write(struct as3645a *flash, u8 addr, u8 val)
0157 {
0158     struct i2c_client *client = flash->client;
0159     int rval;
0160 
0161     rval = i2c_smbus_write_byte_data(client, addr, val);
0162 
0163     dev_dbg(&client->dev, "Write Addr:%02X Val:%02X %s\n", addr, val,
0164         rval < 0 ? "fail" : "ok");
0165 
0166     return rval;
0167 }
0168 
0169 /* Return negative errno else a data byte received from the device. */
0170 static int as3645a_read(struct as3645a *flash, u8 addr)
0171 {
0172     struct i2c_client *client = flash->client;
0173     int rval;
0174 
0175     rval = i2c_smbus_read_byte_data(client, addr);
0176 
0177     dev_dbg(&client->dev, "Read Addr:%02X Val:%02X %s\n", addr, rval,
0178         rval < 0 ? "fail" : "ok");
0179 
0180     return rval;
0181 }
0182 
0183 /* -----------------------------------------------------------------------------
0184  * Hardware configuration and trigger
0185  */
0186 
0187 /**
0188  * as3645a_set_current - Set flash configuration registers
0189  * @flash: The flash
0190  *
0191  * Configure the hardware with flash, assist and indicator currents, as well as
0192  * flash timeout.
0193  *
0194  * Return 0 on success, or a negative error code if an I2C communication error
0195  * occurred.
0196  */
0197 static int as3645a_set_current(struct as3645a *flash)
0198 {
0199     u8 val;
0200 
0201     val = (flash->flash_current << AS_CURRENT_FLASH_CURRENT_SHIFT)
0202         | (flash->assist_current << AS_CURRENT_ASSIST_LIGHT_SHIFT)
0203         | AS_CURRENT_LED_DET_ON;
0204 
0205     return as3645a_write(flash, AS_CURRENT_SET_REG, val);
0206 }
0207 
0208 static int as3645a_set_timeout(struct as3645a *flash)
0209 {
0210     u8 val;
0211 
0212     val = flash->timeout << AS_INDICATOR_AND_TIMER_TIMEOUT_SHIFT;
0213 
0214     val |= (flash->cfg.voltage_reference
0215         << AS_INDICATOR_AND_TIMER_VREF_SHIFT)
0216         |  ((flash->indicator_current ? flash->indicator_current - 1 : 0)
0217          << AS_INDICATOR_AND_TIMER_INDICATOR_SHIFT);
0218 
0219     return as3645a_write(flash, AS_INDICATOR_AND_TIMER_REG, val);
0220 }
0221 
0222 /**
0223  * as3645a_set_control - Set flash control register
0224  * @flash: The flash
0225  * @mode: Desired output mode
0226  * @on: Desired output state
0227  *
0228  * Configure the hardware with output mode and state.
0229  *
0230  * Return 0 on success, or a negative error code if an I2C communication error
0231  * occurred.
0232  */
0233 static int
0234 as3645a_set_control(struct as3645a *flash, enum as_mode mode, bool on)
0235 {
0236     u8 reg;
0237 
0238     /* Configure output parameters and operation mode. */
0239     reg = (flash->cfg.peak << AS_CONTROL_COIL_PEAK_SHIFT)
0240         | (on ? AS_CONTROL_OUT_ON : 0)
0241         | mode;
0242 
0243     if (mode == AS_MODE_FLASH &&
0244         flash->strobe_source == V4L2_FLASH_STROBE_SOURCE_EXTERNAL)
0245         reg |= AS_CONTROL_STROBE_TYPE_LEVEL
0246             |  AS_CONTROL_STROBE_ON;
0247 
0248     return as3645a_write(flash, AS_CONTROL_REG, reg);
0249 }
0250 
0251 static int as3645a_get_fault(struct led_classdev_flash *fled, u32 *fault)
0252 {
0253     struct as3645a *flash = fled_to_as3645a(fled);
0254     int rval;
0255 
0256     /* NOTE: reading register clears fault status */
0257     rval = as3645a_read(flash, AS_FAULT_INFO_REG);
0258     if (rval < 0)
0259         return rval;
0260 
0261     if (rval & AS_FAULT_INFO_INDUCTOR_PEAK_LIMIT)
0262         *fault |= LED_FAULT_OVER_CURRENT;
0263 
0264     if (rval & AS_FAULT_INFO_INDICATOR_LED)
0265         *fault |= LED_FAULT_INDICATOR;
0266 
0267     dev_dbg(&flash->client->dev, "%u connected LEDs\n",
0268         rval & AS_FAULT_INFO_LED_AMOUNT ? 2 : 1);
0269 
0270     if (rval & AS_FAULT_INFO_TIMEOUT)
0271         *fault |= LED_FAULT_TIMEOUT;
0272 
0273     if (rval & AS_FAULT_INFO_OVER_TEMPERATURE)
0274         *fault |= LED_FAULT_OVER_TEMPERATURE;
0275 
0276     if (rval & AS_FAULT_INFO_SHORT_CIRCUIT)
0277         *fault |= LED_FAULT_OVER_CURRENT;
0278 
0279     if (rval & AS_FAULT_INFO_OVER_VOLTAGE)
0280         *fault |= LED_FAULT_INPUT_VOLTAGE;
0281 
0282     return rval;
0283 }
0284 
0285 static unsigned int __as3645a_current_to_reg(unsigned int min, unsigned int max,
0286                          unsigned int step,
0287                          unsigned int val)
0288 {
0289     if (val < min)
0290         val = min;
0291 
0292     if (val > max)
0293         val = max;
0294 
0295     return (val - min) / step;
0296 }
0297 
0298 static unsigned int as3645a_current_to_reg(struct as3645a *flash, bool is_flash,
0299                        unsigned int ua)
0300 {
0301     if (is_flash)
0302         return __as3645a_current_to_reg(AS_TORCH_INTENSITY_MIN,
0303                         flash->cfg.assist_max_ua,
0304                         AS_TORCH_INTENSITY_STEP, ua);
0305     else
0306         return __as3645a_current_to_reg(AS_FLASH_INTENSITY_MIN,
0307                         flash->cfg.flash_max_ua,
0308                         AS_FLASH_INTENSITY_STEP, ua);
0309 }
0310 
0311 static int as3645a_set_indicator_brightness(struct led_classdev *iled_cdev,
0312                         enum led_brightness brightness)
0313 {
0314     struct as3645a *flash = iled_cdev_to_as3645a(iled_cdev);
0315     int rval;
0316 
0317     flash->indicator_current = brightness;
0318 
0319     rval = as3645a_set_timeout(flash);
0320     if (rval)
0321         return rval;
0322 
0323     return as3645a_set_control(flash, AS_MODE_INDICATOR, brightness);
0324 }
0325 
0326 static int as3645a_set_assist_brightness(struct led_classdev *fled_cdev,
0327                      enum led_brightness brightness)
0328 {
0329     struct led_classdev_flash *fled = lcdev_to_flcdev(fled_cdev);
0330     struct as3645a *flash = fled_to_as3645a(fled);
0331     int rval;
0332 
0333     if (brightness) {
0334         /* Register value 0 is 20 mA. */
0335         flash->assist_current = brightness - 1;
0336 
0337         rval = as3645a_set_current(flash);
0338         if (rval)
0339             return rval;
0340     }
0341 
0342     return as3645a_set_control(flash, AS_MODE_ASSIST, brightness);
0343 }
0344 
0345 static int as3645a_set_flash_brightness(struct led_classdev_flash *fled,
0346                     u32 brightness_ua)
0347 {
0348     struct as3645a *flash = fled_to_as3645a(fled);
0349 
0350     flash->flash_current = as3645a_current_to_reg(flash, true,
0351                               brightness_ua);
0352 
0353     return as3645a_set_current(flash);
0354 }
0355 
0356 static int as3645a_set_flash_timeout(struct led_classdev_flash *fled,
0357                      u32 timeout_us)
0358 {
0359     struct as3645a *flash = fled_to_as3645a(fled);
0360 
0361     flash->timeout = AS_TIMER_US_TO_CODE(timeout_us);
0362 
0363     return as3645a_set_timeout(flash);
0364 }
0365 
0366 static int as3645a_set_strobe(struct led_classdev_flash *fled, bool state)
0367 {
0368     struct as3645a *flash = fled_to_as3645a(fled);
0369 
0370     return as3645a_set_control(flash, AS_MODE_FLASH, state);
0371 }
0372 
0373 static const struct led_flash_ops as3645a_led_flash_ops = {
0374     .flash_brightness_set = as3645a_set_flash_brightness,
0375     .timeout_set = as3645a_set_flash_timeout,
0376     .strobe_set = as3645a_set_strobe,
0377     .fault_get = as3645a_get_fault,
0378 };
0379 
0380 static int as3645a_setup(struct as3645a *flash)
0381 {
0382     struct device *dev = &flash->client->dev;
0383     u32 fault = 0;
0384     int rval;
0385 
0386     /* clear errors */
0387     rval = as3645a_read(flash, AS_FAULT_INFO_REG);
0388     if (rval < 0)
0389         return rval;
0390 
0391     dev_dbg(dev, "Fault info: %02x\n", rval);
0392 
0393     rval = as3645a_set_current(flash);
0394     if (rval < 0)
0395         return rval;
0396 
0397     rval = as3645a_set_timeout(flash);
0398     if (rval < 0)
0399         return rval;
0400 
0401     rval = as3645a_set_control(flash, AS_MODE_INDICATOR, false);
0402     if (rval < 0)
0403         return rval;
0404 
0405     /* read status */
0406     rval = as3645a_get_fault(&flash->fled, &fault);
0407     if (rval < 0)
0408         return rval;
0409 
0410     dev_dbg(dev, "AS_INDICATOR_AND_TIMER_REG: %02x\n",
0411         as3645a_read(flash, AS_INDICATOR_AND_TIMER_REG));
0412     dev_dbg(dev, "AS_CURRENT_SET_REG: %02x\n",
0413         as3645a_read(flash, AS_CURRENT_SET_REG));
0414     dev_dbg(dev, "AS_CONTROL_REG: %02x\n",
0415         as3645a_read(flash, AS_CONTROL_REG));
0416 
0417     return rval & ~AS_FAULT_INFO_LED_AMOUNT ? -EIO : 0;
0418 }
0419 
0420 static int as3645a_detect(struct as3645a *flash)
0421 {
0422     struct device *dev = &flash->client->dev;
0423     int rval, man, model, rfu, version;
0424     const char *vendor;
0425 
0426     rval = as3645a_read(flash, AS_DESIGN_INFO_REG);
0427     if (rval < 0) {
0428         dev_err(dev, "can't read design info reg\n");
0429         return rval;
0430     }
0431 
0432     man = AS_DESIGN_INFO_FACTORY(rval);
0433     model = AS_DESIGN_INFO_MODEL(rval);
0434 
0435     rval = as3645a_read(flash, AS_VERSION_CONTROL_REG);
0436     if (rval < 0) {
0437         dev_err(dev, "can't read version control reg\n");
0438         return rval;
0439     }
0440 
0441     rfu = AS_VERSION_CONTROL_RFU(rval);
0442     version = AS_VERSION_CONTROL_VERSION(rval);
0443 
0444     /* Verify the chip model and version. */
0445     if (model != 0x01 || rfu != 0x00) {
0446         dev_err(dev, "AS3645A not detected (model %d rfu %d)\n",
0447             model, rfu);
0448         return -ENODEV;
0449     }
0450 
0451     switch (man) {
0452     case 1:
0453         vendor = "AMS, Austria Micro Systems";
0454         break;
0455     case 2:
0456         vendor = "ADI, Analog Devices Inc.";
0457         break;
0458     case 3:
0459         vendor = "NSC, National Semiconductor";
0460         break;
0461     case 4:
0462         vendor = "NXP";
0463         break;
0464     case 5:
0465         vendor = "TI, Texas Instrument";
0466         break;
0467     default:
0468         vendor = "Unknown";
0469     }
0470 
0471     dev_info(dev, "Chip vendor: %s (%d) Version: %d\n", vendor,
0472          man, version);
0473 
0474     rval = as3645a_write(flash, AS_PASSWORD_REG, AS_PASSWORD_UNLOCK_VALUE);
0475     if (rval < 0)
0476         return rval;
0477 
0478     return as3645a_write(flash, AS_BOOST_REG, AS_BOOST_CURRENT_DISABLE);
0479 }
0480 
0481 static int as3645a_parse_node(struct as3645a *flash,
0482                   struct fwnode_handle *fwnode)
0483 {
0484     struct as3645a_config *cfg = &flash->cfg;
0485     struct fwnode_handle *child;
0486     int rval;
0487 
0488     fwnode_for_each_child_node(fwnode, child) {
0489         u32 id = 0;
0490 
0491         fwnode_property_read_u32(child, "reg", &id);
0492 
0493         switch (id) {
0494         case AS_LED_FLASH:
0495             flash->flash_node = child;
0496             fwnode_handle_get(child);
0497             break;
0498         case AS_LED_INDICATOR:
0499             flash->indicator_node = child;
0500             fwnode_handle_get(child);
0501             break;
0502         default:
0503             dev_warn(&flash->client->dev,
0504                  "unknown LED %u encountered, ignoring\n", id);
0505             break;
0506         }
0507     }
0508 
0509     if (!flash->flash_node) {
0510         dev_err(&flash->client->dev, "can't find flash node\n");
0511         return -ENODEV;
0512     }
0513 
0514     rval = fwnode_property_read_u32(flash->flash_node, "flash-timeout-us",
0515                     &cfg->flash_timeout_us);
0516     if (rval < 0) {
0517         dev_err(&flash->client->dev,
0518             "can't read flash-timeout-us property for flash\n");
0519         goto out_err;
0520     }
0521 
0522     rval = fwnode_property_read_u32(flash->flash_node, "flash-max-microamp",
0523                     &cfg->flash_max_ua);
0524     if (rval < 0) {
0525         dev_err(&flash->client->dev,
0526             "can't read flash-max-microamp property for flash\n");
0527         goto out_err;
0528     }
0529 
0530     rval = fwnode_property_read_u32(flash->flash_node, "led-max-microamp",
0531                     &cfg->assist_max_ua);
0532     if (rval < 0) {
0533         dev_err(&flash->client->dev,
0534             "can't read led-max-microamp property for flash\n");
0535         goto out_err;
0536     }
0537 
0538     fwnode_property_read_u32(flash->flash_node, "voltage-reference",
0539                  &cfg->voltage_reference);
0540 
0541     fwnode_property_read_u32(flash->flash_node, "ams,input-max-microamp",
0542                  &cfg->peak);
0543     cfg->peak = AS_PEAK_mA_TO_REG(cfg->peak);
0544 
0545     if (!flash->indicator_node) {
0546         dev_warn(&flash->client->dev,
0547              "can't find indicator node\n");
0548         rval = -ENODEV;
0549         goto out_err;
0550     }
0551 
0552 
0553     rval = fwnode_property_read_u32(flash->indicator_node,
0554                     "led-max-microamp",
0555                     &cfg->indicator_max_ua);
0556     if (rval < 0) {
0557         dev_err(&flash->client->dev,
0558             "can't read led-max-microamp property for indicator\n");
0559         goto out_err;
0560     }
0561 
0562     return 0;
0563 
0564 out_err:
0565     fwnode_handle_put(flash->flash_node);
0566     fwnode_handle_put(flash->indicator_node);
0567 
0568     return rval;
0569 }
0570 
0571 static int as3645a_led_class_setup(struct as3645a *flash)
0572 {
0573     struct led_classdev *fled_cdev = &flash->fled.led_cdev;
0574     struct led_classdev *iled_cdev = &flash->iled_cdev;
0575     struct led_init_data init_data = {};
0576     struct led_flash_setting *cfg;
0577     int rval;
0578 
0579     iled_cdev->brightness_set_blocking = as3645a_set_indicator_brightness;
0580     iled_cdev->max_brightness =
0581         flash->cfg.indicator_max_ua / AS_INDICATOR_INTENSITY_STEP;
0582     iled_cdev->flags = LED_CORE_SUSPENDRESUME;
0583 
0584     init_data.fwnode = flash->indicator_node;
0585     init_data.devicename = AS_NAME;
0586     init_data.default_label = "indicator";
0587 
0588     rval = led_classdev_register_ext(&flash->client->dev, iled_cdev,
0589                      &init_data);
0590     if (rval < 0)
0591         return rval;
0592 
0593     cfg = &flash->fled.brightness;
0594     cfg->min = AS_FLASH_INTENSITY_MIN;
0595     cfg->max = flash->cfg.flash_max_ua;
0596     cfg->step = AS_FLASH_INTENSITY_STEP;
0597     cfg->val = flash->cfg.flash_max_ua;
0598 
0599     cfg = &flash->fled.timeout;
0600     cfg->min = AS_FLASH_TIMEOUT_MIN;
0601     cfg->max = flash->cfg.flash_timeout_us;
0602     cfg->step = AS_FLASH_TIMEOUT_STEP;
0603     cfg->val = flash->cfg.flash_timeout_us;
0604 
0605     flash->fled.ops = &as3645a_led_flash_ops;
0606 
0607     fled_cdev->brightness_set_blocking = as3645a_set_assist_brightness;
0608     /* Value 0 is off in LED class. */
0609     fled_cdev->max_brightness =
0610         as3645a_current_to_reg(flash, false,
0611                        flash->cfg.assist_max_ua) + 1;
0612     fled_cdev->flags = LED_DEV_CAP_FLASH | LED_CORE_SUSPENDRESUME;
0613 
0614     init_data.fwnode = flash->flash_node;
0615     init_data.devicename = AS_NAME;
0616     init_data.default_label = "flash";
0617 
0618     rval = led_classdev_flash_register_ext(&flash->client->dev,
0619                            &flash->fled, &init_data);
0620     if (rval)
0621         goto out_err;
0622 
0623     return rval;
0624 
0625 out_err:
0626     led_classdev_unregister(iled_cdev);
0627     dev_err(&flash->client->dev,
0628         "led_classdev_flash_register() failed, error %d\n",
0629         rval);
0630     return rval;
0631 }
0632 
0633 static int as3645a_v4l2_setup(struct as3645a *flash)
0634 {
0635     struct led_classdev_flash *fled = &flash->fled;
0636     struct led_classdev *led = &fled->led_cdev;
0637     struct v4l2_flash_config cfg = {
0638         .intensity = {
0639             .min = AS_TORCH_INTENSITY_MIN,
0640             .max = flash->cfg.assist_max_ua,
0641             .step = AS_TORCH_INTENSITY_STEP,
0642             .val = flash->cfg.assist_max_ua,
0643         },
0644     };
0645     struct v4l2_flash_config cfgind = {
0646         .intensity = {
0647             .min = AS_INDICATOR_INTENSITY_MIN,
0648             .max = flash->cfg.indicator_max_ua,
0649             .step = AS_INDICATOR_INTENSITY_STEP,
0650             .val = flash->cfg.indicator_max_ua,
0651         },
0652     };
0653 
0654     strlcpy(cfg.dev_name, led->dev->kobj.name, sizeof(cfg.dev_name));
0655     strlcpy(cfgind.dev_name, flash->iled_cdev.dev->kobj.name,
0656         sizeof(cfgind.dev_name));
0657 
0658     flash->vf = v4l2_flash_init(
0659         &flash->client->dev, flash->flash_node, &flash->fled, NULL,
0660         &cfg);
0661     if (IS_ERR(flash->vf))
0662         return PTR_ERR(flash->vf);
0663 
0664     flash->vfind = v4l2_flash_indicator_init(
0665         &flash->client->dev, flash->indicator_node, &flash->iled_cdev,
0666         &cfgind);
0667     if (IS_ERR(flash->vfind)) {
0668         v4l2_flash_release(flash->vf);
0669         return PTR_ERR(flash->vfind);
0670     }
0671 
0672     return 0;
0673 }
0674 
0675 static int as3645a_probe(struct i2c_client *client)
0676 {
0677     struct as3645a *flash;
0678     int rval;
0679 
0680     if (!dev_fwnode(&client->dev))
0681         return -ENODEV;
0682 
0683     flash = devm_kzalloc(&client->dev, sizeof(*flash), GFP_KERNEL);
0684     if (flash == NULL)
0685         return -ENOMEM;
0686 
0687     flash->client = client;
0688 
0689     rval = as3645a_parse_node(flash, dev_fwnode(&client->dev));
0690     if (rval < 0)
0691         return rval;
0692 
0693     rval = as3645a_detect(flash);
0694     if (rval < 0)
0695         goto out_put_nodes;
0696 
0697     mutex_init(&flash->mutex);
0698     i2c_set_clientdata(client, flash);
0699 
0700     rval = as3645a_setup(flash);
0701     if (rval)
0702         goto out_mutex_destroy;
0703 
0704     rval = as3645a_led_class_setup(flash);
0705     if (rval)
0706         goto out_mutex_destroy;
0707 
0708     rval = as3645a_v4l2_setup(flash);
0709     if (rval)
0710         goto out_led_classdev_flash_unregister;
0711 
0712     return 0;
0713 
0714 out_led_classdev_flash_unregister:
0715     led_classdev_flash_unregister(&flash->fled);
0716 
0717 out_mutex_destroy:
0718     mutex_destroy(&flash->mutex);
0719 
0720 out_put_nodes:
0721     fwnode_handle_put(flash->flash_node);
0722     fwnode_handle_put(flash->indicator_node);
0723 
0724     return rval;
0725 }
0726 
0727 static int as3645a_remove(struct i2c_client *client)
0728 {
0729     struct as3645a *flash = i2c_get_clientdata(client);
0730 
0731     as3645a_set_control(flash, AS_MODE_EXT_TORCH, false);
0732 
0733     v4l2_flash_release(flash->vf);
0734     v4l2_flash_release(flash->vfind);
0735 
0736     led_classdev_flash_unregister(&flash->fled);
0737     led_classdev_unregister(&flash->iled_cdev);
0738 
0739     mutex_destroy(&flash->mutex);
0740 
0741     fwnode_handle_put(flash->flash_node);
0742     fwnode_handle_put(flash->indicator_node);
0743 
0744     return 0;
0745 }
0746 
0747 static const struct i2c_device_id as3645a_id_table[] = {
0748     { AS_NAME, 0 },
0749     { },
0750 };
0751 MODULE_DEVICE_TABLE(i2c, as3645a_id_table);
0752 
0753 static const struct of_device_id as3645a_of_table[] = {
0754     { .compatible = "ams,as3645a" },
0755     { },
0756 };
0757 MODULE_DEVICE_TABLE(of, as3645a_of_table);
0758 
0759 static struct i2c_driver as3645a_i2c_driver = {
0760     .driver = {
0761         .of_match_table = as3645a_of_table,
0762         .name = AS_NAME,
0763     },
0764     .probe_new  = as3645a_probe,
0765     .remove = as3645a_remove,
0766     .id_table = as3645a_id_table,
0767 };
0768 
0769 module_i2c_driver(as3645a_i2c_driver);
0770 
0771 MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
0772 MODULE_AUTHOR("Sakari Ailus <sakari.ailus@iki.fi>");
0773 MODULE_DESCRIPTION("LED flash driver for AS3645A, LM3555 and their clones");
0774 MODULE_LICENSE("GPL v2");
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