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1// SPDX-License-Identifier: GPL-2.0+2// Driver for Awinic AW2013 3-channel LED driver3 4#include <linux/i2c.h>5#include <linux/leds.h>6#include <linux/module.h>7#include <linux/regulator/consumer.h>8#include <linux/mutex.h>9#include <linux/of.h>10#include <linux/regmap.h>11 12#define AW2013_MAX_LEDS 313 14/* Reset and ID register */15#define AW2013_RSTR 0x0016#define AW2013_RSTR_RESET 0x5517#define AW2013_RSTR_CHIP_ID 0x3318 19/* Global control register */20#define AW2013_GCR 0x0121#define AW2013_GCR_ENABLE BIT(0)22 23/* LED channel enable register */24#define AW2013_LCTR 0x3025#define AW2013_LCTR_LE(x) BIT((x))26 27/* LED channel control registers */28#define AW2013_LCFG(x) (0x31 + (x))29#define AW2013_LCFG_IMAX_MASK (BIT(0) | BIT(1)) // Should be 0-330#define AW2013_LCFG_MD BIT(4)31#define AW2013_LCFG_FI BIT(5)32#define AW2013_LCFG_FO BIT(6)33 34/* LED channel PWM registers */35#define AW2013_REG_PWM(x) (0x34 + (x))36 37/* LED channel timing registers */38#define AW2013_LEDT0(x) (0x37 + (x) * 3)39#define AW2013_LEDT0_T1(x) ((x) << 4) // Should be 0-740#define AW2013_LEDT0_T2(x) (x) // Should be 0-541 42#define AW2013_LEDT1(x) (0x38 + (x) * 3)43#define AW2013_LEDT1_T3(x) ((x) << 4) // Should be 0-744#define AW2013_LEDT1_T4(x) (x) // Should be 0-745 46#define AW2013_LEDT2(x) (0x39 + (x) * 3)47#define AW2013_LEDT2_T0(x) ((x) << 4) // Should be 0-848#define AW2013_LEDT2_REPEAT(x) (x) // Should be 0-1549 50#define AW2013_REG_MAX 0x7751 52#define AW2013_TIME_STEP 130 /* ms */53 54struct aw2013;55 56struct aw2013_led {57 struct aw2013 *chip;58 struct led_classdev cdev;59 u32 num;60 unsigned int imax;61};62 63struct aw2013 {64 struct mutex mutex; /* held when writing to registers */65 struct regulator_bulk_data regulators[2];66 struct i2c_client *client;67 struct aw2013_led leds[AW2013_MAX_LEDS];68 struct regmap *regmap;69 int num_leds;70 bool enabled;71};72 73static int aw2013_chip_init(struct aw2013 *chip)74{75 int i, ret;76 77 ret = regmap_write(chip->regmap, AW2013_GCR, AW2013_GCR_ENABLE);78 if (ret) {79 dev_err(&chip->client->dev, "Failed to enable the chip: %d\n",80 ret);81 return ret;82 }83 84 for (i = 0; i < chip->num_leds; i++) {85 ret = regmap_update_bits(chip->regmap,86 AW2013_LCFG(chip->leds[i].num),87 AW2013_LCFG_IMAX_MASK,88 chip->leds[i].imax);89 if (ret) {90 dev_err(&chip->client->dev,91 "Failed to set maximum current for led %d: %d\n",92 chip->leds[i].num, ret);93 return ret;94 }95 }96 97 return ret;98}99 100static void aw2013_chip_disable(struct aw2013 *chip)101{102 int ret;103 104 if (!chip->enabled)105 return;106 107 regmap_write(chip->regmap, AW2013_GCR, 0);108 109 ret = regulator_bulk_disable(ARRAY_SIZE(chip->regulators),110 chip->regulators);111 if (ret) {112 dev_err(&chip->client->dev,113 "Failed to disable regulators: %d\n", ret);114 return;115 }116 117 chip->enabled = false;118}119 120static int aw2013_chip_enable(struct aw2013 *chip)121{122 int ret;123 124 if (chip->enabled)125 return 0;126 127 ret = regulator_bulk_enable(ARRAY_SIZE(chip->regulators),128 chip->regulators);129 if (ret) {130 dev_err(&chip->client->dev,131 "Failed to enable regulators: %d\n", ret);132 return ret;133 }134 chip->enabled = true;135 136 ret = aw2013_chip_init(chip);137 if (ret)138 aw2013_chip_disable(chip);139 140 return ret;141}142 143static bool aw2013_chip_in_use(struct aw2013 *chip)144{145 int i;146 147 for (i = 0; i < chip->num_leds; i++)148 if (chip->leds[i].cdev.brightness)149 return true;150 151 return false;152}153 154static int aw2013_brightness_set(struct led_classdev *cdev,155 enum led_brightness brightness)156{157 struct aw2013_led *led = container_of(cdev, struct aw2013_led, cdev);158 int ret, num;159 160 mutex_lock(&led->chip->mutex);161 162 if (aw2013_chip_in_use(led->chip)) {163 ret = aw2013_chip_enable(led->chip);164 if (ret)165 goto error;166 }167 168 num = led->num;169 170 ret = regmap_write(led->chip->regmap, AW2013_REG_PWM(num), brightness);171 if (ret)172 goto error;173 174 if (brightness) {175 ret = regmap_update_bits(led->chip->regmap, AW2013_LCTR,176 AW2013_LCTR_LE(num), 0xFF);177 } else {178 ret = regmap_update_bits(led->chip->regmap, AW2013_LCTR,179 AW2013_LCTR_LE(num), 0);180 if (ret)181 goto error;182 ret = regmap_update_bits(led->chip->regmap, AW2013_LCFG(num),183 AW2013_LCFG_MD, 0);184 }185 if (ret)186 goto error;187 188 if (!aw2013_chip_in_use(led->chip))189 aw2013_chip_disable(led->chip);190 191error:192 mutex_unlock(&led->chip->mutex);193 194 return ret;195}196 197static int aw2013_blink_set(struct led_classdev *cdev,198 unsigned long *delay_on, unsigned long *delay_off)199{200 struct aw2013_led *led = container_of(cdev, struct aw2013_led, cdev);201 int ret, num = led->num;202 unsigned long off = 0, on = 0;203 204 /* If no blink specified, default to 1 Hz. */205 if (!*delay_off && !*delay_on) {206 *delay_off = 500;207 *delay_on = 500;208 }209 210 if (!led->cdev.brightness) {211 led->cdev.brightness = LED_FULL;212 ret = aw2013_brightness_set(&led->cdev, led->cdev.brightness);213 if (ret)214 return ret;215 }216 217 /* Never on - just set to off */218 if (!*delay_on) {219 led->cdev.brightness = LED_OFF;220 return aw2013_brightness_set(&led->cdev, LED_OFF);221 }222 223 mutex_lock(&led->chip->mutex);224 225 /* Never off - brightness is already set, disable blinking */226 if (!*delay_off) {227 ret = regmap_update_bits(led->chip->regmap, AW2013_LCFG(num),228 AW2013_LCFG_MD, 0);229 goto out;230 }231 232 /* Convert into values the HW will understand. */233 off = min(5, ilog2((*delay_off - 1) / AW2013_TIME_STEP) + 1);234 on = min(7, ilog2((*delay_on - 1) / AW2013_TIME_STEP) + 1);235 236 *delay_off = BIT(off) * AW2013_TIME_STEP;237 *delay_on = BIT(on) * AW2013_TIME_STEP;238 239 /* Set timings */240 ret = regmap_write(led->chip->regmap,241 AW2013_LEDT0(num), AW2013_LEDT0_T2(on));242 if (ret)243 goto out;244 ret = regmap_write(led->chip->regmap,245 AW2013_LEDT1(num), AW2013_LEDT1_T4(off));246 if (ret)247 goto out;248 249 /* Finally, enable the LED */250 ret = regmap_update_bits(led->chip->regmap, AW2013_LCFG(num),251 AW2013_LCFG_MD, 0xFF);252 if (ret)253 goto out;254 255 ret = regmap_update_bits(led->chip->regmap, AW2013_LCTR,256 AW2013_LCTR_LE(num), 0xFF);257 258out:259 mutex_unlock(&led->chip->mutex);260 261 return ret;262}263 264static int aw2013_probe_dt(struct aw2013 *chip)265{266 struct device_node *np = dev_of_node(&chip->client->dev);267 int count, ret = 0, i = 0;268 struct aw2013_led *led;269 270 count = of_get_available_child_count(np);271 if (!count || count > AW2013_MAX_LEDS)272 return -EINVAL;273 274 regmap_write(chip->regmap, AW2013_RSTR, AW2013_RSTR_RESET);275 276 for_each_available_child_of_node_scoped(np, child) {277 struct led_init_data init_data = {};278 u32 source;279 u32 imax;280 281 ret = of_property_read_u32(child, "reg", &source);282 if (ret != 0 || source >= AW2013_MAX_LEDS) {283 dev_err(&chip->client->dev,284 "Couldn't read LED address: %d\n", ret);285 count--;286 continue;287 }288 289 led = &chip->leds[i];290 led->num = source;291 led->chip = chip;292 init_data.fwnode = of_fwnode_handle(child);293 294 if (!of_property_read_u32(child, "led-max-microamp", &imax)) {295 led->imax = min_t(u32, imax / 5000, 3);296 } else {297 led->imax = 1; // 5mA298 dev_info(&chip->client->dev,299 "DT property led-max-microamp is missing\n");300 }301 302 led->cdev.brightness_set_blocking = aw2013_brightness_set;303 led->cdev.blink_set = aw2013_blink_set;304 305 ret = devm_led_classdev_register_ext(&chip->client->dev,306 &led->cdev, &init_data);307 if (ret < 0)308 return ret;309 310 i++;311 }312 313 if (!count)314 return -EINVAL;315 316 chip->num_leds = i;317 318 return 0;319}320 321static void aw2013_chip_disable_action(void *data)322{323 aw2013_chip_disable(data);324}325 326static const struct regmap_config aw2013_regmap_config = {327 .reg_bits = 8,328 .val_bits = 8,329 .max_register = AW2013_REG_MAX,330};331 332static int aw2013_probe(struct i2c_client *client)333{334 struct aw2013 *chip;335 int ret;336 unsigned int chipid;337 338 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);339 if (!chip)340 return -ENOMEM;341 342 ret = devm_mutex_init(&client->dev, &chip->mutex);343 if (ret)344 return ret;345 346 mutex_lock(&chip->mutex);347 348 chip->client = client;349 i2c_set_clientdata(client, chip);350 351 chip->regmap = devm_regmap_init_i2c(client, &aw2013_regmap_config);352 if (IS_ERR(chip->regmap)) {353 ret = PTR_ERR(chip->regmap);354 dev_err(&client->dev, "Failed to allocate register map: %d\n",355 ret);356 goto error;357 }358 359 chip->regulators[0].supply = "vcc";360 chip->regulators[1].supply = "vio";361 ret = devm_regulator_bulk_get(&client->dev,362 ARRAY_SIZE(chip->regulators),363 chip->regulators);364 if (ret < 0) {365 if (ret != -EPROBE_DEFER)366 dev_err(&client->dev,367 "Failed to request regulators: %d\n", ret);368 goto error;369 }370 371 ret = regulator_bulk_enable(ARRAY_SIZE(chip->regulators),372 chip->regulators);373 if (ret) {374 dev_err(&client->dev,375 "Failed to enable regulators: %d\n", ret);376 goto error;377 }378 379 ret = regmap_read(chip->regmap, AW2013_RSTR, &chipid);380 if (ret) {381 dev_err(&client->dev, "Failed to read chip ID: %d\n",382 ret);383 goto error_reg;384 }385 386 if (chipid != AW2013_RSTR_CHIP_ID) {387 dev_err(&client->dev, "Chip reported wrong ID: %x\n",388 chipid);389 ret = -ENODEV;390 goto error_reg;391 }392 393 ret = devm_add_action(&client->dev, aw2013_chip_disable_action, chip);394 if (ret)395 goto error_reg;396 397 ret = aw2013_probe_dt(chip);398 if (ret < 0)399 goto error_reg;400 401 ret = regulator_bulk_disable(ARRAY_SIZE(chip->regulators),402 chip->regulators);403 if (ret) {404 dev_err(&client->dev,405 "Failed to disable regulators: %d\n", ret);406 goto error;407 }408 409 mutex_unlock(&chip->mutex);410 411 return 0;412 413error_reg:414 regulator_bulk_disable(ARRAY_SIZE(chip->regulators),415 chip->regulators);416 417error:418 mutex_unlock(&chip->mutex);419 return ret;420}421 422static const struct of_device_id aw2013_match_table[] = {423 { .compatible = "awinic,aw2013", },424 { /* sentinel */ },425};426 427MODULE_DEVICE_TABLE(of, aw2013_match_table);428 429static struct i2c_driver aw2013_driver = {430 .driver = {431 .name = "leds-aw2013",432 .of_match_table = aw2013_match_table,433 },434 .probe = aw2013_probe,435};436 437module_i2c_driver(aw2013_driver);438 439MODULE_AUTHOR("Nikita Travkin <nikitos.tr@gmail.com>");440MODULE_DESCRIPTION("AW2013 LED driver");441MODULE_LICENSE("GPL v2");442