// SPDX-License-Identifier: GPL-2.0-only /* * LP5521/LP5523/LP55231/LP5562 Common Driver * * Copyright 2012 Texas Instruments * * Author: Milo(Woogyom) Kim * * Derived from leds-lp5521.c, leds-lp5523.c */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include "leds-lp55xx-common.h" /* OP MODE require at least 153 us to clear regs */ #define LP55XX_CMD_SLEEP 200 #define LP55xx_PROGRAM_PAGES 16 #define LP55xx_MAX_PROGRAM_LENGTH (LP55xx_BYTES_PER_PAGE * 4) /* 128 bytes (4 pages) */ /* * Program Memory Operations * Same Mask for each engine for both mode and exec * ENG1 GENMASK(3, 2) * ENG2 GENMASK(5, 4) * ENG3 GENMASK(7, 6) */ #define LP55xx_MODE_DISABLE_ALL_ENG 0x0 #define LP55xx_MODE_ENG_MASK GENMASK(1, 0) #define LP55xx_MODE_DISABLE_ENG FIELD_PREP_CONST(LP55xx_MODE_ENG_MASK, 0x0) #define LP55xx_MODE_LOAD_ENG FIELD_PREP_CONST(LP55xx_MODE_ENG_MASK, 0x1) #define LP55xx_MODE_RUN_ENG FIELD_PREP_CONST(LP55xx_MODE_ENG_MASK, 0x2) #define LP55xx_MODE_HALT_ENG FIELD_PREP_CONST(LP55xx_MODE_ENG_MASK, 0x3) #define LP55xx_MODE_ENGn_SHIFT(n, shift) ((shift) + (2 * (3 - (n)))) #define LP55xx_MODE_ENGn_MASK(n, shift) (LP55xx_MODE_ENG_MASK << LP55xx_MODE_ENGn_SHIFT(n, shift)) #define LP55xx_MODE_ENGn_GET(n, mode, shift) \ (((mode) >> LP55xx_MODE_ENGn_SHIFT(n, shift)) & LP55xx_MODE_ENG_MASK) #define LP55xx_EXEC_ENG_MASK GENMASK(1, 0) #define LP55xx_EXEC_HOLD_ENG FIELD_PREP_CONST(LP55xx_EXEC_ENG_MASK, 0x0) #define LP55xx_EXEC_STEP_ENG FIELD_PREP_CONST(LP55xx_EXEC_ENG_MASK, 0x1) #define LP55xx_EXEC_RUN_ENG FIELD_PREP_CONST(LP55xx_EXEC_ENG_MASK, 0x2) #define LP55xx_EXEC_ONCE_ENG FIELD_PREP_CONST(LP55xx_EXEC_ENG_MASK, 0x3) #define LP55xx_EXEC_ENGn_SHIFT(n, shift) ((shift) + (2 * (3 - (n)))) #define LP55xx_EXEC_ENGn_MASK(n, shift) (LP55xx_EXEC_ENG_MASK << LP55xx_EXEC_ENGn_SHIFT(n, shift)) /* Memory Page Selection */ #define LP55xx_REG_PROG_PAGE_SEL 0x4f /* If supported, each ENGINE have an equal amount of pages offset from page 0 */ #define LP55xx_PAGE_OFFSET(n, pages) (((n) - 1) * (pages)) #define LED_ACTIVE(mux, led) (!!((mux) & (0x0001 << (led)))) /* MASTER FADER common property */ #define LP55xx_FADER_MAPPING_MASK GENMASK(7, 6) /* External clock rate */ #define LP55XX_CLK_32K 32768 static struct lp55xx_led *cdev_to_lp55xx_led(struct led_classdev *cdev) { return container_of(cdev, struct lp55xx_led, cdev); } static struct lp55xx_led *dev_to_lp55xx_led(struct device *dev) { return cdev_to_lp55xx_led(dev_get_drvdata(dev)); } static struct lp55xx_led *mcled_cdev_to_led(struct led_classdev_mc *mc_cdev) { return container_of(mc_cdev, struct lp55xx_led, mc_cdev); } static void lp55xx_wait_opmode_done(struct lp55xx_chip *chip) { const struct lp55xx_device_config *cfg = chip->cfg; int __always_unused ret; u8 val; /* * Recent chip supports BUSY bit for engine. * Check support by checking if val is not 0. * For legacy device, sleep at least 153 us. */ if (cfg->engine_busy.val) { read_poll_timeout(lp55xx_read, ret, !(val & cfg->engine_busy.mask), LP55XX_CMD_SLEEP, LP55XX_CMD_SLEEP * 10, false, chip, cfg->engine_busy.addr, &val); } else { usleep_range(LP55XX_CMD_SLEEP, LP55XX_CMD_SLEEP * 2); } } void lp55xx_stop_all_engine(struct lp55xx_chip *chip) { const struct lp55xx_device_config *cfg = chip->cfg; lp55xx_write(chip, cfg->reg_op_mode.addr, LP55xx_MODE_DISABLE_ALL_ENG); lp55xx_wait_opmode_done(chip); } EXPORT_SYMBOL_GPL(lp55xx_stop_all_engine); void lp55xx_load_engine(struct lp55xx_chip *chip) { enum lp55xx_engine_index idx = chip->engine_idx; const struct lp55xx_device_config *cfg = chip->cfg; u8 mask, val; mask = LP55xx_MODE_ENGn_MASK(idx, cfg->reg_op_mode.shift); val = LP55xx_MODE_LOAD_ENG << LP55xx_MODE_ENGn_SHIFT(idx, cfg->reg_op_mode.shift); lp55xx_update_bits(chip, cfg->reg_op_mode.addr, mask, val); lp55xx_wait_opmode_done(chip); /* Setup PAGE if supported (pages_per_engine not 0)*/ if (cfg->pages_per_engine) lp55xx_write(chip, LP55xx_REG_PROG_PAGE_SEL, LP55xx_PAGE_OFFSET(idx, cfg->pages_per_engine)); } EXPORT_SYMBOL_GPL(lp55xx_load_engine); int lp55xx_run_engine_common(struct lp55xx_chip *chip) { const struct lp55xx_device_config *cfg = chip->cfg; u8 mode, exec; int i, ret; /* To run the engine, both OP MODE and EXEC needs to be put in RUN mode */ ret = lp55xx_read(chip, cfg->reg_op_mode.addr, &mode); if (ret) return ret; ret = lp55xx_read(chip, cfg->reg_exec.addr, &exec); if (ret) return ret; /* Switch to RUN only for engine that were put in LOAD previously */ for (i = LP55XX_ENGINE_1; i <= LP55XX_ENGINE_3; i++) { if (LP55xx_MODE_ENGn_GET(i, mode, cfg->reg_op_mode.shift) != LP55xx_MODE_LOAD_ENG) continue; mode &= ~LP55xx_MODE_ENGn_MASK(i, cfg->reg_op_mode.shift); mode |= LP55xx_MODE_RUN_ENG << LP55xx_MODE_ENGn_SHIFT(i, cfg->reg_op_mode.shift); exec &= ~LP55xx_EXEC_ENGn_MASK(i, cfg->reg_exec.shift); exec |= LP55xx_EXEC_RUN_ENG << LP55xx_EXEC_ENGn_SHIFT(i, cfg->reg_exec.shift); } lp55xx_write(chip, cfg->reg_op_mode.addr, mode); lp55xx_wait_opmode_done(chip); lp55xx_write(chip, cfg->reg_exec.addr, exec); return 0; } EXPORT_SYMBOL_GPL(lp55xx_run_engine_common); int lp55xx_update_program_memory(struct lp55xx_chip *chip, const u8 *data, size_t size) { enum lp55xx_engine_index idx = chip->engine_idx; const struct lp55xx_device_config *cfg = chip->cfg; u8 pattern[LP55xx_MAX_PROGRAM_LENGTH] = { }; u8 start_addr = cfg->prog_mem_base.addr; int page, i = 0, offset = 0; int program_length, ret; program_length = LP55xx_BYTES_PER_PAGE; if (cfg->pages_per_engine) program_length *= cfg->pages_per_engine; while ((offset < size - 1) && (i < program_length)) { unsigned int cmd; int nrchars; char c[3]; /* separate sscanfs because length is working only for %s */ ret = sscanf(data + offset, "%2s%n ", c, &nrchars); if (ret != 1) goto err; ret = sscanf(c, "%2x", &cmd); if (ret != 1) goto err; pattern[i] = (u8)cmd; offset += nrchars; i++; } /* Each instruction is 16bit long. Check that length is even */ if (i % 2) goto err; /* * For legacy LED chip with no page support, engine base address are * one after another at offset of 32. * For LED chip that support page, PAGE is already set in load_engine. */ if (!cfg->pages_per_engine) start_addr += LP55xx_BYTES_PER_PAGE * idx; for (page = 0; page < program_length / LP55xx_BYTES_PER_PAGE; page++) { /* Write to the next page each 32 bytes (if supported) */ if (cfg->pages_per_engine) lp55xx_write(chip, LP55xx_REG_PROG_PAGE_SEL, LP55xx_PAGE_OFFSET(idx, cfg->pages_per_engine) + page); for (i = 0; i < LP55xx_BYTES_PER_PAGE; i++) { ret = lp55xx_write(chip, start_addr + i, pattern[i + (page * LP55xx_BYTES_PER_PAGE)]); if (ret) return -EINVAL; } } return size; err: dev_err(&chip->cl->dev, "wrong pattern format\n"); return -EINVAL; } EXPORT_SYMBOL_GPL(lp55xx_update_program_memory); void lp55xx_firmware_loaded_cb(struct lp55xx_chip *chip) { const struct lp55xx_device_config *cfg = chip->cfg; const struct firmware *fw = chip->fw; int program_length; program_length = LP55xx_BYTES_PER_PAGE; if (cfg->pages_per_engine) program_length *= cfg->pages_per_engine; /* * the firmware is encoded in ascii hex character, with 2 chars * per byte */ if (fw->size > program_length * 2) { dev_err(&chip->cl->dev, "firmware data size overflow: %zu\n", fw->size); return; } /* * Program memory sequence * 1) set engine mode to "LOAD" * 2) write firmware data into program memory */ lp55xx_load_engine(chip); lp55xx_update_program_memory(chip, fw->data, fw->size); } EXPORT_SYMBOL_GPL(lp55xx_firmware_loaded_cb); int lp55xx_led_brightness(struct lp55xx_led *led) { struct lp55xx_chip *chip = led->chip; const struct lp55xx_device_config *cfg = chip->cfg; int ret; guard(mutex)(&chip->lock); ret = lp55xx_write(chip, cfg->reg_led_pwm_base.addr + led->chan_nr, led->brightness); return ret; } EXPORT_SYMBOL_GPL(lp55xx_led_brightness); int lp55xx_multicolor_brightness(struct lp55xx_led *led) { struct lp55xx_chip *chip = led->chip; const struct lp55xx_device_config *cfg = chip->cfg; int ret; int i; guard(mutex)(&chip->lock); for (i = 0; i < led->mc_cdev.num_colors; i++) { ret = lp55xx_write(chip, cfg->reg_led_pwm_base.addr + led->mc_cdev.subled_info[i].channel, led->mc_cdev.subled_info[i].brightness); if (ret) break; } return ret; } EXPORT_SYMBOL_GPL(lp55xx_multicolor_brightness); void lp55xx_set_led_current(struct lp55xx_led *led, u8 led_current) { struct lp55xx_chip *chip = led->chip; const struct lp55xx_device_config *cfg = chip->cfg; led->led_current = led_current; lp55xx_write(led->chip, cfg->reg_led_current_base.addr + led->chan_nr, led_current); } EXPORT_SYMBOL_GPL(lp55xx_set_led_current); void lp55xx_turn_off_channels(struct lp55xx_chip *chip) { const struct lp55xx_device_config *cfg = chip->cfg; int i; for (i = 0; i < cfg->max_channel; i++) lp55xx_write(chip, cfg->reg_led_pwm_base.addr + i, 0); } EXPORT_SYMBOL_GPL(lp55xx_turn_off_channels); void lp55xx_stop_engine(struct lp55xx_chip *chip) { enum lp55xx_engine_index idx = chip->engine_idx; const struct lp55xx_device_config *cfg = chip->cfg; u8 mask; mask = LP55xx_MODE_ENGn_MASK(idx, cfg->reg_op_mode.shift); lp55xx_update_bits(chip, cfg->reg_op_mode.addr, mask, 0); lp55xx_wait_opmode_done(chip); } EXPORT_SYMBOL_GPL(lp55xx_stop_engine); static void lp55xx_reset_device(struct lp55xx_chip *chip) { const struct lp55xx_device_config *cfg = chip->cfg; u8 addr = cfg->reset.addr; u8 val = cfg->reset.val; /* no error checking here because no ACK from the device after reset */ lp55xx_write(chip, addr, val); } static int lp55xx_detect_device(struct lp55xx_chip *chip) { const struct lp55xx_device_config *cfg = chip->cfg; u8 addr = cfg->enable.addr; u8 val = cfg->enable.val; int ret; ret = lp55xx_write(chip, addr, val); if (ret) return ret; usleep_range(1000, 2000); ret = lp55xx_read(chip, addr, &val); if (ret) return ret; if (val != cfg->enable.val) return -ENODEV; return 0; } static int lp55xx_post_init_device(struct lp55xx_chip *chip) { const struct lp55xx_device_config *cfg = chip->cfg; if (!cfg->post_init_device) return 0; return cfg->post_init_device(chip); } static ssize_t led_current_show(struct device *dev, struct device_attribute *attr, char *buf) { struct lp55xx_led *led = dev_to_lp55xx_led(dev); return sysfs_emit(buf, "%d\n", led->led_current); } static ssize_t led_current_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { struct lp55xx_led *led = dev_to_lp55xx_led(dev); struct lp55xx_chip *chip = led->chip; unsigned long curr; if (kstrtoul(buf, 0, &curr)) return -EINVAL; if (curr > led->max_current) return -EINVAL; if (!chip->cfg->set_led_current) return len; guard(mutex)(&chip->lock); chip->cfg->set_led_current(led, (u8)curr); return len; } static ssize_t max_current_show(struct device *dev, struct device_attribute *attr, char *buf) { struct lp55xx_led *led = dev_to_lp55xx_led(dev); return sysfs_emit(buf, "%d\n", led->max_current); } static DEVICE_ATTR_RW(led_current); static DEVICE_ATTR_RO(max_current); static struct attribute *lp55xx_led_attrs[] = { &dev_attr_led_current.attr, &dev_attr_max_current.attr, NULL, }; ATTRIBUTE_GROUPS(lp55xx_led); static int lp55xx_set_mc_brightness(struct led_classdev *cdev, enum led_brightness brightness) { struct led_classdev_mc *mc_dev = lcdev_to_mccdev(cdev); struct lp55xx_led *led = mcled_cdev_to_led(mc_dev); const struct lp55xx_device_config *cfg = led->chip->cfg; led_mc_calc_color_components(&led->mc_cdev, brightness); return cfg->multicolor_brightness_fn(led); } static int lp55xx_set_brightness(struct led_classdev *cdev, enum led_brightness brightness) { struct lp55xx_led *led = cdev_to_lp55xx_led(cdev); const struct lp55xx_device_config *cfg = led->chip->cfg; led->brightness = (u8)brightness; return cfg->brightness_fn(led); } static int lp55xx_init_led(struct lp55xx_led *led, struct lp55xx_chip *chip, int chan) { struct lp55xx_platform_data *pdata = chip->pdata; const struct lp55xx_device_config *cfg = chip->cfg; struct device *dev = &chip->cl->dev; int max_channel = cfg->max_channel; struct mc_subled *mc_led_info; struct led_classdev *led_cdev; char name[32]; int i; int ret; if (chan >= max_channel) { dev_err(dev, "invalid channel: %d / %d\n", chan, max_channel); return -EINVAL; } if (pdata->led_config[chan].led_current == 0) return 0; if (pdata->led_config[chan].name) { led->cdev.name = pdata->led_config[chan].name; } else { snprintf(name, sizeof(name), "%s:channel%d", pdata->label ? : chip->cl->name, chan); led->cdev.name = name; } if (pdata->led_config[chan].num_colors > 1) { mc_led_info = devm_kcalloc(dev, pdata->led_config[chan].num_colors, sizeof(*mc_led_info), GFP_KERNEL); if (!mc_led_info) return -ENOMEM; led_cdev = &led->mc_cdev.led_cdev; led_cdev->name = led->cdev.name; led_cdev->brightness_set_blocking = lp55xx_set_mc_brightness; led->mc_cdev.num_colors = pdata->led_config[chan].num_colors; for (i = 0; i < led->mc_cdev.num_colors; i++) { mc_led_info[i].color_index = pdata->led_config[chan].color_id[i]; mc_led_info[i].channel = pdata->led_config[chan].output_num[i]; } led->mc_cdev.subled_info = mc_led_info; } else { led->cdev.brightness_set_blocking = lp55xx_set_brightness; } led->cdev.groups = lp55xx_led_groups; led->cdev.default_trigger = pdata->led_config[chan].default_trigger; led->led_current = pdata->led_config[chan].led_current; led->max_current = pdata->led_config[chan].max_current; led->chan_nr = pdata->led_config[chan].chan_nr; if (led->chan_nr >= max_channel) { dev_err(dev, "Use channel numbers between 0 and %d\n", max_channel - 1); return -EINVAL; } if (pdata->led_config[chan].num_colors > 1) ret = devm_led_classdev_multicolor_register(dev, &led->mc_cdev); else ret = devm_led_classdev_register(dev, &led->cdev); if (ret) { dev_err(dev, "led register err: %d\n", ret); return ret; } return 0; } static void lp55xx_firmware_loaded(const struct firmware *fw, void *context) { struct lp55xx_chip *chip = context; struct device *dev = &chip->cl->dev; enum lp55xx_engine_index idx = chip->engine_idx; if (!fw) { dev_err(dev, "firmware request failed\n"); return; } /* handling firmware data is chip dependent */ scoped_guard(mutex, &chip->lock) { chip->engines[idx - 1].mode = LP55XX_ENGINE_LOAD; chip->fw = fw; if (chip->cfg->firmware_cb) chip->cfg->firmware_cb(chip); } /* firmware should be released for other channel use */ release_firmware(chip->fw); chip->fw = NULL; } static int lp55xx_request_firmware(struct lp55xx_chip *chip) { const char *name = chip->cl->name; struct device *dev = &chip->cl->dev; return request_firmware_nowait(THIS_MODULE, false, name, dev, GFP_KERNEL, chip, lp55xx_firmware_loaded); } static ssize_t select_engine_show(struct device *dev, struct device_attribute *attr, char *buf) { struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); struct lp55xx_chip *chip = led->chip; return sprintf(buf, "%d\n", chip->engine_idx); } static ssize_t select_engine_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); struct lp55xx_chip *chip = led->chip; unsigned long val; int ret; if (kstrtoul(buf, 0, &val)) return -EINVAL; /* select the engine to be run */ switch (val) { case LP55XX_ENGINE_1: case LP55XX_ENGINE_2: case LP55XX_ENGINE_3: scoped_guard(mutex, &chip->lock) { chip->engine_idx = val; ret = lp55xx_request_firmware(chip); } break; default: dev_err(dev, "%lu: invalid engine index. (1, 2, 3)\n", val); return -EINVAL; } if (ret) { dev_err(dev, "request firmware err: %d\n", ret); return ret; } return len; } static inline void lp55xx_run_engine(struct lp55xx_chip *chip, bool start) { if (chip->cfg->run_engine) chip->cfg->run_engine(chip, start); } static ssize_t run_engine_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); struct lp55xx_chip *chip = led->chip; unsigned long val; if (kstrtoul(buf, 0, &val)) return -EINVAL; /* run or stop the selected engine */ if (val <= 0) { lp55xx_run_engine(chip, false); return len; } guard(mutex)(&chip->lock); lp55xx_run_engine(chip, true); return len; } static DEVICE_ATTR_RW(select_engine); static DEVICE_ATTR_WO(run_engine); ssize_t lp55xx_show_engine_mode(struct device *dev, struct device_attribute *attr, char *buf, int nr) { struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); struct lp55xx_chip *chip = led->chip; enum lp55xx_engine_mode mode = chip->engines[nr - 1].mode; switch (mode) { case LP55XX_ENGINE_RUN: return sysfs_emit(buf, "run\n"); case LP55XX_ENGINE_LOAD: return sysfs_emit(buf, "load\n"); case LP55XX_ENGINE_DISABLED: default: return sysfs_emit(buf, "disabled\n"); } } EXPORT_SYMBOL_GPL(lp55xx_show_engine_mode); ssize_t lp55xx_store_engine_mode(struct device *dev, struct device_attribute *attr, const char *buf, size_t len, int nr) { struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); struct lp55xx_chip *chip = led->chip; const struct lp55xx_device_config *cfg = chip->cfg; struct lp55xx_engine *engine = &chip->engines[nr - 1]; guard(mutex)(&chip->lock); chip->engine_idx = nr; if (!strncmp(buf, "run", 3)) { cfg->run_engine(chip, true); engine->mode = LP55XX_ENGINE_RUN; } else if (!strncmp(buf, "load", 4)) { lp55xx_stop_engine(chip); lp55xx_load_engine(chip); engine->mode = LP55XX_ENGINE_LOAD; } else if (!strncmp(buf, "disabled", 8)) { lp55xx_stop_engine(chip); engine->mode = LP55XX_ENGINE_DISABLED; } return len; } EXPORT_SYMBOL_GPL(lp55xx_store_engine_mode); ssize_t lp55xx_store_engine_load(struct device *dev, struct device_attribute *attr, const char *buf, size_t len, int nr) { struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); struct lp55xx_chip *chip = led->chip; int ret; guard(mutex)(&chip->lock); chip->engine_idx = nr; lp55xx_load_engine(chip); ret = lp55xx_update_program_memory(chip, buf, len); return ret; } EXPORT_SYMBOL_GPL(lp55xx_store_engine_load); static int lp55xx_mux_parse(struct lp55xx_chip *chip, const char *buf, u16 *mux, size_t len) { const struct lp55xx_device_config *cfg = chip->cfg; u16 tmp_mux = 0; int i; len = min_t(int, len, cfg->max_channel); for (i = 0; i < len; i++) { switch (buf[i]) { case '1': tmp_mux |= (1 << i); break; case '0': break; case '\n': i = len; break; default: return -1; } } *mux = tmp_mux; return 0; } ssize_t lp55xx_show_engine_leds(struct device *dev, struct device_attribute *attr, char *buf, int nr) { struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); struct lp55xx_chip *chip = led->chip; const struct lp55xx_device_config *cfg = chip->cfg; unsigned int led_active; int i, pos = 0; for (i = 0; i < cfg->max_channel; i++) { led_active = LED_ACTIVE(chip->engines[nr - 1].led_mux, i); pos += sysfs_emit_at(buf, pos, "%x", led_active); } pos += sysfs_emit_at(buf, pos, "\n"); return pos; } EXPORT_SYMBOL_GPL(lp55xx_show_engine_leds); static int lp55xx_load_mux(struct lp55xx_chip *chip, u16 mux, int nr) { struct lp55xx_engine *engine = &chip->engines[nr - 1]; const struct lp55xx_device_config *cfg = chip->cfg; u8 mux_page; int ret; lp55xx_load_engine(chip); /* Derive the MUX page offset by starting at the end of the ENGINE pages */ mux_page = cfg->pages_per_engine * LP55XX_ENGINE_MAX + (nr - 1); ret = lp55xx_write(chip, LP55xx_REG_PROG_PAGE_SEL, mux_page); if (ret) return ret; ret = lp55xx_write(chip, cfg->prog_mem_base.addr, (u8)(mux >> 8)); if (ret) return ret; ret = lp55xx_write(chip, cfg->prog_mem_base.addr + 1, (u8)(mux)); if (ret) return ret; engine->led_mux = mux; return 0; } ssize_t lp55xx_store_engine_leds(struct device *dev, struct device_attribute *attr, const char *buf, size_t len, int nr) { struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); struct lp55xx_chip *chip = led->chip; struct lp55xx_engine *engine = &chip->engines[nr - 1]; u16 mux = 0; if (lp55xx_mux_parse(chip, buf, &mux, len)) return -EINVAL; guard(mutex)(&chip->lock); chip->engine_idx = nr; if (engine->mode != LP55XX_ENGINE_LOAD) return -EINVAL; if (lp55xx_load_mux(chip, mux, nr)) return -EINVAL; return len; } EXPORT_SYMBOL_GPL(lp55xx_store_engine_leds); ssize_t lp55xx_show_master_fader(struct device *dev, struct device_attribute *attr, char *buf, int nr) { struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); struct lp55xx_chip *chip = led->chip; const struct lp55xx_device_config *cfg = chip->cfg; int ret; u8 val; guard(mutex)(&chip->lock); ret = lp55xx_read(chip, cfg->reg_master_fader_base.addr + nr - 1, &val); return ret ? ret : sysfs_emit(buf, "%u\n", val); } EXPORT_SYMBOL_GPL(lp55xx_show_master_fader); ssize_t lp55xx_store_master_fader(struct device *dev, struct device_attribute *attr, const char *buf, size_t len, int nr) { struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); struct lp55xx_chip *chip = led->chip; const struct lp55xx_device_config *cfg = chip->cfg; int ret; unsigned long val; if (kstrtoul(buf, 0, &val)) return -EINVAL; if (val > 0xff) return -EINVAL; guard(mutex)(&chip->lock); ret = lp55xx_write(chip, cfg->reg_master_fader_base.addr + nr - 1, (u8)val); return ret ? ret : len; } EXPORT_SYMBOL_GPL(lp55xx_store_master_fader); ssize_t lp55xx_show_master_fader_leds(struct device *dev, struct device_attribute *attr, char *buf) { struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); struct lp55xx_chip *chip = led->chip; const struct lp55xx_device_config *cfg = chip->cfg; int i, ret, pos = 0; u8 val; guard(mutex)(&chip->lock); for (i = 0; i < cfg->max_channel; i++) { ret = lp55xx_read(chip, cfg->reg_led_ctrl_base.addr + i, &val); if (ret) return ret; val = FIELD_GET(LP55xx_FADER_MAPPING_MASK, val); if (val > FIELD_MAX(LP55xx_FADER_MAPPING_MASK)) { return -EINVAL; } buf[pos++] = val + '0'; } buf[pos++] = '\n'; return pos; } EXPORT_SYMBOL_GPL(lp55xx_show_master_fader_leds); ssize_t lp55xx_store_master_fader_leds(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); struct lp55xx_chip *chip = led->chip; const struct lp55xx_device_config *cfg = chip->cfg; int i, n, ret; u8 val; n = min_t(int, len, cfg->max_channel); guard(mutex)(&chip->lock); for (i = 0; i < n; i++) { if (buf[i] >= '0' && buf[i] <= '3') { val = (buf[i] - '0') << __bf_shf(LP55xx_FADER_MAPPING_MASK); ret = lp55xx_update_bits(chip, cfg->reg_led_ctrl_base.addr + i, LP55xx_FADER_MAPPING_MASK, val); if (ret) return ret; } else { return -EINVAL; } } return len; } EXPORT_SYMBOL_GPL(lp55xx_store_master_fader_leds); static struct attribute *lp55xx_engine_attributes[] = { &dev_attr_select_engine.attr, &dev_attr_run_engine.attr, NULL, }; static const struct attribute_group lp55xx_engine_attr_group = { .attrs = lp55xx_engine_attributes, }; int lp55xx_write(struct lp55xx_chip *chip, u8 reg, u8 val) { return i2c_smbus_write_byte_data(chip->cl, reg, val); } EXPORT_SYMBOL_GPL(lp55xx_write); int lp55xx_read(struct lp55xx_chip *chip, u8 reg, u8 *val) { s32 ret; ret = i2c_smbus_read_byte_data(chip->cl, reg); if (ret < 0) return ret; *val = ret; return 0; } EXPORT_SYMBOL_GPL(lp55xx_read); int lp55xx_update_bits(struct lp55xx_chip *chip, u8 reg, u8 mask, u8 val) { int ret; u8 tmp; ret = lp55xx_read(chip, reg, &tmp); if (ret) return ret; tmp &= ~mask; tmp |= val & mask; return lp55xx_write(chip, reg, tmp); } EXPORT_SYMBOL_GPL(lp55xx_update_bits); bool lp55xx_is_extclk_used(struct lp55xx_chip *chip) { struct clk *clk; int err; clk = devm_clk_get(&chip->cl->dev, "32k_clk"); if (IS_ERR(clk)) goto use_internal_clk; err = clk_prepare_enable(clk); if (err) goto use_internal_clk; if (clk_get_rate(clk) != LP55XX_CLK_32K) { clk_disable_unprepare(clk); goto use_internal_clk; } dev_info(&chip->cl->dev, "%dHz external clock used\n", LP55XX_CLK_32K); chip->clk = clk; return true; use_internal_clk: dev_info(&chip->cl->dev, "internal clock used\n"); return false; } EXPORT_SYMBOL_GPL(lp55xx_is_extclk_used); static void lp55xx_deinit_device(struct lp55xx_chip *chip) { struct lp55xx_platform_data *pdata = chip->pdata; if (chip->clk) clk_disable_unprepare(chip->clk); if (pdata->enable_gpiod) gpiod_set_value(pdata->enable_gpiod, 0); } static int lp55xx_init_device(struct lp55xx_chip *chip) { struct lp55xx_platform_data *pdata; const struct lp55xx_device_config *cfg; struct device *dev = &chip->cl->dev; int ret = 0; WARN_ON(!chip); pdata = chip->pdata; cfg = chip->cfg; if (!pdata || !cfg) return -EINVAL; if (pdata->enable_gpiod) { gpiod_direction_output(pdata->enable_gpiod, 0); gpiod_set_consumer_name(pdata->enable_gpiod, "LP55xx enable"); gpiod_set_value_cansleep(pdata->enable_gpiod, 0); usleep_range(1000, 2000); /* Keep enable down at least 1ms */ gpiod_set_value_cansleep(pdata->enable_gpiod, 1); usleep_range(1000, 2000); /* 500us abs min. */ } lp55xx_reset_device(chip); /* * Exact value is not available. 10 - 20ms * appears to be enough for reset. */ usleep_range(10000, 20000); ret = lp55xx_detect_device(chip); if (ret) { dev_err(dev, "device detection err: %d\n", ret); goto err; } /* chip specific initialization */ ret = lp55xx_post_init_device(chip); if (ret) { dev_err(dev, "post init device err: %d\n", ret); goto err_post_init; } return 0; err_post_init: lp55xx_deinit_device(chip); err: return ret; } static int lp55xx_register_leds(struct lp55xx_led *led, struct lp55xx_chip *chip) { struct lp55xx_platform_data *pdata = chip->pdata; const struct lp55xx_device_config *cfg = chip->cfg; int num_channels = pdata->num_channels; struct lp55xx_led *each; u8 led_current; int ret; int i; if (!cfg->brightness_fn) { dev_err(&chip->cl->dev, "empty brightness configuration\n"); return -EINVAL; } for (i = 0; i < num_channels; i++) { /* do not initialize channels that are not connected */ if (pdata->led_config[i].led_current == 0) continue; led_current = pdata->led_config[i].led_current; each = led + i; ret = lp55xx_init_led(each, chip, i); if (ret) goto err_init_led; chip->num_leds++; each->chip = chip; /* setting led current at each channel */ if (cfg->set_led_current) cfg->set_led_current(each, led_current); } return 0; err_init_led: return ret; } static int lp55xx_register_sysfs(struct lp55xx_chip *chip) { struct device *dev = &chip->cl->dev; const struct lp55xx_device_config *cfg = chip->cfg; int ret; if (!cfg->run_engine || !cfg->firmware_cb) goto dev_specific_attrs; ret = sysfs_create_group(&dev->kobj, &lp55xx_engine_attr_group); if (ret) return ret; dev_specific_attrs: return cfg->dev_attr_group ? sysfs_create_group(&dev->kobj, cfg->dev_attr_group) : 0; } static void lp55xx_unregister_sysfs(struct lp55xx_chip *chip) { struct device *dev = &chip->cl->dev; const struct lp55xx_device_config *cfg = chip->cfg; if (cfg->dev_attr_group) sysfs_remove_group(&dev->kobj, cfg->dev_attr_group); sysfs_remove_group(&dev->kobj, &lp55xx_engine_attr_group); } static int lp55xx_parse_common_child(struct device_node *np, struct lp55xx_led_config *cfg, int led_number, int *chan_nr) { int ret; of_property_read_string(np, "chan-name", &cfg[led_number].name); of_property_read_u8(np, "led-cur", &cfg[led_number].led_current); of_property_read_u8(np, "max-cur", &cfg[led_number].max_current); ret = of_property_read_u32(np, "reg", chan_nr); if (ret) return ret; if (*chan_nr < 0 || *chan_nr > cfg->max_channel) return -EINVAL; return 0; } static int lp55xx_parse_multi_led_child(struct device_node *child, struct lp55xx_led_config *cfg, int child_number, int color_number) { int chan_nr, color_id, ret; ret = lp55xx_parse_common_child(child, cfg, child_number, &chan_nr); if (ret) return ret; ret = of_property_read_u32(child, "color", &color_id); if (ret) return ret; cfg[child_number].color_id[color_number] = color_id; cfg[child_number].output_num[color_number] = chan_nr; return 0; } static int lp55xx_parse_multi_led(struct device_node *np, struct lp55xx_led_config *cfg, int child_number) { struct device_node *child; int num_colors = 0, ret; for_each_available_child_of_node(np, child) { ret = lp55xx_parse_multi_led_child(child, cfg, child_number, num_colors); if (ret) { of_node_put(child); return ret; } num_colors++; } cfg[child_number].num_colors = num_colors; return 0; } static int lp55xx_parse_logical_led(struct device_node *np, struct lp55xx_led_config *cfg, int child_number) { int led_color, ret; int chan_nr = 0; cfg[child_number].default_trigger = of_get_property(np, "linux,default-trigger", NULL); ret = of_property_read_u32(np, "color", &led_color); if (ret) return ret; if (led_color == LED_COLOR_ID_RGB) return lp55xx_parse_multi_led(np, cfg, child_number); ret = lp55xx_parse_common_child(np, cfg, child_number, &chan_nr); if (ret < 0) return ret; cfg[child_number].chan_nr = chan_nr; return ret; } static struct lp55xx_platform_data *lp55xx_of_populate_pdata(struct device *dev, struct device_node *np, struct lp55xx_chip *chip) { struct device_node *child; struct lp55xx_platform_data *pdata; struct lp55xx_led_config *cfg; int num_channels; int i = 0; int ret; pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); if (!pdata) return ERR_PTR(-ENOMEM); num_channels = of_get_available_child_count(np); if (num_channels == 0) { dev_err(dev, "no LED channels\n"); return ERR_PTR(-EINVAL); } cfg = devm_kcalloc(dev, num_channels, sizeof(*cfg), GFP_KERNEL); if (!cfg) return ERR_PTR(-ENOMEM); pdata->led_config = &cfg[0]; pdata->num_channels = num_channels; cfg->max_channel = chip->cfg->max_channel; for_each_available_child_of_node(np, child) { ret = lp55xx_parse_logical_led(child, cfg, i); if (ret) { of_node_put(child); return ERR_PTR(-EINVAL); } i++; } if (of_property_read_u32(np, "ti,charge-pump-mode", &pdata->charge_pump_mode)) pdata->charge_pump_mode = LP55XX_CP_AUTO; if (pdata->charge_pump_mode > LP55XX_CP_AUTO) { dev_err(dev, "invalid charge pump mode %d\n", pdata->charge_pump_mode); return ERR_PTR(-EINVAL); } of_property_read_string(np, "label", &pdata->label); of_property_read_u8(np, "clock-mode", &pdata->clock_mode); pdata->enable_gpiod = devm_gpiod_get_optional(dev, "enable", GPIOD_ASIS); if (IS_ERR(pdata->enable_gpiod)) return ERR_CAST(pdata->enable_gpiod); /* LP8501 specific */ of_property_read_u8(np, "pwr-sel", (u8 *)&pdata->pwr_sel); return pdata; } int lp55xx_probe(struct i2c_client *client) { const struct i2c_device_id *id = i2c_client_get_device_id(client); int program_length, ret; struct lp55xx_chip *chip; struct lp55xx_led *led; struct lp55xx_platform_data *pdata = dev_get_platdata(&client->dev); struct device_node *np = dev_of_node(&client->dev); chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL); if (!chip) return -ENOMEM; chip->cfg = i2c_get_match_data(client); if (!pdata) { if (np) { pdata = lp55xx_of_populate_pdata(&client->dev, np, chip); if (IS_ERR(pdata)) return PTR_ERR(pdata); } else { dev_err(&client->dev, "no platform data\n"); return -EINVAL; } } /* Validate max program page */ program_length = LP55xx_BYTES_PER_PAGE; if (chip->cfg->pages_per_engine) program_length *= chip->cfg->pages_per_engine; /* support a max of 128bytes */ if (program_length > LP55xx_MAX_PROGRAM_LENGTH) { dev_err(&client->dev, "invalid pages_per_engine configured\n"); return -EINVAL; } led = devm_kcalloc(&client->dev, pdata->num_channels, sizeof(*led), GFP_KERNEL); if (!led) return -ENOMEM; chip->cl = client; chip->pdata = pdata; mutex_init(&chip->lock); i2c_set_clientdata(client, led); ret = lp55xx_init_device(chip); if (ret) goto err_init; dev_info(&client->dev, "%s Programmable led chip found\n", id->name); ret = lp55xx_register_leds(led, chip); if (ret) goto err_out; ret = lp55xx_register_sysfs(chip); if (ret) { dev_err(&client->dev, "registering sysfs failed\n"); goto err_out; } return 0; err_out: lp55xx_deinit_device(chip); err_init: return ret; } EXPORT_SYMBOL_GPL(lp55xx_probe); void lp55xx_remove(struct i2c_client *client) { struct lp55xx_led *led = i2c_get_clientdata(client); struct lp55xx_chip *chip = led->chip; lp55xx_stop_all_engine(chip); lp55xx_unregister_sysfs(chip); lp55xx_deinit_device(chip); } EXPORT_SYMBOL_GPL(lp55xx_remove); MODULE_AUTHOR("Milo Kim "); MODULE_DESCRIPTION("LP55xx Common Driver"); MODULE_LICENSE("GPL");