/* * lp5523.c - LP5523 LED Driver * * Copyright (C) 2010 Nokia Corporation * * Contact: Samu Onkalo <samu.p.onkalo@nokia.com> * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * version 2 as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA * 02110-1301 USA */ #include <linux/module.h> #include <linux/init.h> #include <linux/i2c.h> #include <linux/mutex.h> #include <linux/gpio.h> #include <linux/interrupt.h> #include <linux/delay.h> #include <linux/ctype.h> #include <linux/spinlock.h> #include <linux/wait.h> #include <linux/leds.h> #include <linux/leds-lp5523.h> #include <linux/workqueue.h> #include <linux/slab.h> #define LP5523_REG_ENABLE 0x00 #define LP5523_REG_OP_MODE 0x01 #define LP5523_REG_RATIOMETRIC_MSB 0x02 #define LP5523_REG_RATIOMETRIC_LSB 0x03 #define LP5523_REG_ENABLE_LEDS_MSB 0x04 #define LP5523_REG_ENABLE_LEDS_LSB 0x05 #define LP5523_REG_LED_CNTRL_BASE 0x06 #define LP5523_REG_LED_PWM_BASE 0x16 #define LP5523_REG_LED_CURRENT_BASE 0x26 #define LP5523_REG_CONFIG 0x36 #define LP5523_REG_CHANNEL1_PC 0x37 #define LP5523_REG_CHANNEL2_PC 0x38 #define LP5523_REG_CHANNEL3_PC 0x39 #define LP5523_REG_STATUS 0x3a #define LP5523_REG_GPO 0x3b #define LP5523_REG_VARIABLE 0x3c #define LP5523_REG_RESET 0x3d #define LP5523_REG_TEMP_CTRL 0x3e #define LP5523_REG_TEMP_READ 0x3f #define LP5523_REG_TEMP_WRITE 0x40 #define LP5523_REG_LED_TEST_CTRL 0x41 #define LP5523_REG_LED_TEST_ADC 0x42 #define LP5523_REG_ENG1_VARIABLE 0x45 #define LP5523_REG_ENG2_VARIABLE 0x46 #define LP5523_REG_ENG3_VARIABLE 0x47 #define LP5523_REG_MASTER_FADER1 0x48 #define LP5523_REG_MASTER_FADER2 0x49 #define LP5523_REG_MASTER_FADER3 0x4a #define LP5523_REG_CH1_PROG_START 0x4c #define LP5523_REG_CH2_PROG_START 0x4d #define LP5523_REG_CH3_PROG_START 0x4e #define LP5523_REG_PROG_PAGE_SEL 0x4f #define LP5523_REG_PROG_MEM 0x50 #define LP5523_CMD_LOAD 0x15 /* 00010101 */ #define LP5523_CMD_RUN 0x2a /* 00101010 */ #define LP5523_CMD_DISABLED 0x00 /* 00000000 */ #define LP5523_ENABLE 0x40 #define LP5523_AUTO_INC 0x40 #define LP5523_PWR_SAVE 0x20 #define LP5523_PWM_PWR_SAVE 0x04 #define LP5523_CP_1 0x08 #define LP5523_CP_1_5 0x10 #define LP5523_CP_AUTO 0x18 #define LP5523_INT_CLK 0x01 #define LP5523_AUTO_CLK 0x02 #define LP5523_EN_LEDTEST 0x80 #define LP5523_LEDTEST_DONE 0x80 #define LP5523_DEFAULT_CURRENT 50 /* microAmps */ #define LP5523_PROGRAM_LENGTH 32 /* in bytes */ #define LP5523_PROGRAM_PAGES 6 #define LP5523_ADC_SHORTCIRC_LIM 80 #define LP5523_LEDS 9 #define LP5523_ENGINES 3 #define LP5523_ENG_MASK_BASE 0x30 /* 00110000 */ #define LP5523_ENG_STATUS_MASK 0x07 /* 00000111 */ #define LP5523_IRQ_FLAGS IRQF_TRIGGER_FALLING #define LP5523_EXT_CLK_USED 0x08 #define LED_ACTIVE(mux, led) (!!(mux & (0x0001 << led))) #define SHIFT_MASK(id) (((id) - 1) * 2) struct lp5523_engine { int id; u8 mode; u8 prog_page; u8 mux_page; u16 led_mux; u8 engine_mask; }; struct lp5523_led { int id; u8 chan_nr; u8 led_current; u8 max_current; struct led_classdev cdev; struct work_struct brightness_work; u8 brightness; }; struct lp5523_chip { struct mutex lock; /* Serialize control */ struct i2c_client *client; struct lp5523_engine engines[LP5523_ENGINES]; struct lp5523_led leds[LP5523_LEDS]; struct lp5523_platform_data *pdata; u8 num_channels; u8 num_leds; }; static inline struct lp5523_led *cdev_to_led(struct led_classdev *cdev) { return container_of(cdev, struct lp5523_led, cdev); } static inline struct lp5523_chip *engine_to_lp5523(struct lp5523_engine *engine) { return container_of(engine, struct lp5523_chip, engines[engine->id - 1]); } static inline struct lp5523_chip *led_to_lp5523(struct lp5523_led *led) { return container_of(led, struct lp5523_chip, leds[led->id]); } static int lp5523_set_mode(struct lp5523_engine *engine, u8 mode); static int lp5523_set_engine_mode(struct lp5523_engine *engine, u8 mode); static int lp5523_load_program(struct lp5523_engine *engine, u8 *pattern); static void lp5523_led_brightness_work(struct work_struct *work); static int lp5523_write(struct i2c_client *client, u8 reg, u8 value) { return i2c_smbus_write_byte_data(client, reg, value); } static int lp5523_read(struct i2c_client *client, u8 reg, u8 *buf) { s32 ret = i2c_smbus_read_byte_data(client, reg); if (ret < 0) return -EIO; *buf = ret; return 0; } static int lp5523_detect(struct i2c_client *client) { int ret; u8 buf; ret = lp5523_write(client, LP5523_REG_ENABLE, 0x40); if (ret) return ret; ret = lp5523_read(client, LP5523_REG_ENABLE, &buf); if (ret) return ret; if (buf == 0x40) return 0; else return -ENODEV; } static int lp5523_configure(struct i2c_client *client) { struct lp5523_chip *chip = i2c_get_clientdata(client); int ret = 0; u8 status; /* one pattern per engine setting led mux start and stop addresses */ u8 pattern[][LP5523_PROGRAM_LENGTH] = { { 0x9c, 0x30, 0x9c, 0xb0, 0x9d, 0x80, 0xd8, 0x00, 0}, { 0x9c, 0x40, 0x9c, 0xc0, 0x9d, 0x80, 0xd8, 0x00, 0}, { 0x9c, 0x50, 0x9c, 0xd0, 0x9d, 0x80, 0xd8, 0x00, 0}, }; ret |= lp5523_write(client, LP5523_REG_ENABLE, LP5523_ENABLE); /* Chip startup time is 500 us, 1 - 2 ms gives some margin */ usleep_range(1000, 2000); ret |= lp5523_write(client, LP5523_REG_CONFIG, LP5523_AUTO_INC | LP5523_PWR_SAVE | LP5523_CP_AUTO | LP5523_AUTO_CLK | LP5523_PWM_PWR_SAVE); /* turn on all leds */ ret |= lp5523_write(client, LP5523_REG_ENABLE_LEDS_MSB, 0x01); ret |= lp5523_write(client, LP5523_REG_ENABLE_LEDS_LSB, 0xff); /* hardcode 32 bytes of memory for each engine from program memory */ ret |= lp5523_write(client, LP5523_REG_CH1_PROG_START, 0x00); ret |= lp5523_write(client, LP5523_REG_CH2_PROG_START, 0x10); ret |= lp5523_write(client, LP5523_REG_CH3_PROG_START, 0x20); /* write led mux address space for each channel */ ret |= lp5523_load_program(&chip->engines[0], pattern[0]); ret |= lp5523_load_program(&chip->engines[1], pattern[1]); ret |= lp5523_load_program(&chip->engines[2], pattern[2]); if (ret) { dev_err(&client->dev, "could not load mux programs\n"); return -1; } /* set all engines exec state and mode to run 00101010 */ ret |= lp5523_write(client, LP5523_REG_ENABLE, (LP5523_CMD_RUN | LP5523_ENABLE)); ret |= lp5523_write(client, LP5523_REG_OP_MODE, LP5523_CMD_RUN); if (ret) { dev_err(&client->dev, "could not start mux programs\n"); return -1; } /* Let the programs run for couple of ms and check the engine status */ usleep_range(3000, 6000); lp5523_read(client, LP5523_REG_STATUS, &status); status &= LP5523_ENG_STATUS_MASK; if (status == LP5523_ENG_STATUS_MASK) { dev_dbg(&client->dev, "all engines configured\n"); } else { dev_info(&client->dev, "status == %x\n", status); dev_err(&client->dev, "cound not configure LED engine\n"); return -1; } dev_info(&client->dev, "disabling engines\n"); ret |= lp5523_write(client, LP5523_REG_OP_MODE, LP5523_CMD_DISABLED); return ret; } static int lp5523_set_engine_mode(struct lp5523_engine *engine, u8 mode) { struct lp5523_chip *chip = engine_to_lp5523(engine); struct i2c_client *client = chip->client; int ret; u8 engine_state; ret = lp5523_read(client, LP5523_REG_OP_MODE, &engine_state); if (ret) goto fail; engine_state &= ~(engine->engine_mask); /* set mode only for this engine */ mode &= engine->engine_mask; engine_state |= mode; ret |= lp5523_write(client, LP5523_REG_OP_MODE, engine_state); fail: return ret; } static int lp5523_load_mux(struct lp5523_engine *engine, u16 mux) { struct lp5523_chip *chip = engine_to_lp5523(engine); struct i2c_client *client = chip->client; int ret = 0; ret |= lp5523_set_engine_mode(engine, LP5523_CMD_LOAD); ret |= lp5523_write(client, LP5523_REG_PROG_PAGE_SEL, engine->mux_page); ret |= lp5523_write(client, LP5523_REG_PROG_MEM, (u8)(mux >> 8)); ret |= lp5523_write(client, LP5523_REG_PROG_MEM + 1, (u8)(mux)); engine->led_mux = mux; return ret; } static int lp5523_load_program(struct lp5523_engine *engine, u8 *pattern) { struct lp5523_chip *chip = engine_to_lp5523(engine); struct i2c_client *client = chip->client; int ret = 0; ret |= lp5523_set_engine_mode(engine, LP5523_CMD_LOAD); ret |= lp5523_write(client, LP5523_REG_PROG_PAGE_SEL, engine->prog_page); ret |= i2c_smbus_write_i2c_block_data(client, LP5523_REG_PROG_MEM, LP5523_PROGRAM_LENGTH, pattern); return ret; } static int lp5523_run_program(struct lp5523_engine *engine) { struct lp5523_chip *chip = engine_to_lp5523(engine); struct i2c_client *client = chip->client; int ret; ret = lp5523_write(client, LP5523_REG_ENABLE, LP5523_CMD_RUN | LP5523_ENABLE); if (ret) goto fail; ret = lp5523_set_engine_mode(engine, LP5523_CMD_RUN); fail: return ret; } static int lp5523_mux_parse(const char *buf, u16 *mux, size_t len) { int i; u16 tmp_mux = 0; len = len < LP5523_LEDS ? len : LP5523_LEDS; 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; } static void lp5523_mux_to_array(u16 led_mux, char *array) { int i, pos = 0; for (i = 0; i < LP5523_LEDS; i++) pos += sprintf(array + pos, "%x", LED_ACTIVE(led_mux, i)); array[pos] = '\0'; } /*--------------------------------------------------------------*/ /* Sysfs interface */ /*--------------------------------------------------------------*/ static ssize_t show_engine_leds(struct device *dev, struct device_attribute *attr, char *buf, int nr) { struct i2c_client *client = to_i2c_client(dev); struct lp5523_chip *chip = i2c_get_clientdata(client); char mux[LP5523_LEDS + 1]; lp5523_mux_to_array(chip->engines[nr - 1].led_mux, mux); return sprintf(buf, "%s\n", mux); } #define show_leds(nr) \ static ssize_t show_engine##nr##_leds(struct device *dev, \ struct device_attribute *attr, \ char *buf) \ { \ return show_engine_leds(dev, attr, buf, nr); \ } show_leds(1) show_leds(2) show_leds(3) static ssize_t store_engine_leds(struct device *dev, struct device_attribute *attr, const char *buf, size_t len, int nr) { struct i2c_client *client = to_i2c_client(dev); struct lp5523_chip *chip = i2c_get_clientdata(client); u16 mux = 0; ssize_t ret; if (lp5523_mux_parse(buf, &mux, len)) return -EINVAL; mutex_lock(&chip->lock); ret = -EINVAL; if (chip->engines[nr - 1].mode != LP5523_CMD_LOAD) goto leave; if (lp5523_load_mux(&chip->engines[nr - 1], mux)) goto leave; ret = len; leave: mutex_unlock(&chip->lock); return ret; } #define store_leds(nr) \ static ssize_t store_engine##nr##_leds(struct device *dev, \ struct device_attribute *attr, \ const char *buf, size_t len) \ { \ return store_engine_leds(dev, attr, buf, len, nr); \ } store_leds(1) store_leds(2) store_leds(3) static ssize_t lp5523_selftest(struct device *dev, struct device_attribute *attr, char *buf) { struct i2c_client *client = to_i2c_client(dev); struct lp5523_chip *chip = i2c_get_clientdata(client); int i, ret, pos = 0; int led = 0; u8 status, adc, vdd; mutex_lock(&chip->lock); ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status); if (ret < 0) goto fail; /* Check that ext clock is really in use if requested */ if ((chip->pdata) && (chip->pdata->clock_mode == LP5523_CLOCK_EXT)) if ((status & LP5523_EXT_CLK_USED) == 0) goto fail; /* Measure VDD (i.e. VBAT) first (channel 16 corresponds to VDD) */ lp5523_write(chip->client, LP5523_REG_LED_TEST_CTRL, LP5523_EN_LEDTEST | 16); usleep_range(3000, 6000); /* ADC conversion time is typically 2.7 ms */ ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status); if (!(status & LP5523_LEDTEST_DONE)) usleep_range(3000, 6000); /* Was not ready. Wait little bit */ ret |= lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &vdd); vdd--; /* There may be some fluctuation in measurement */ for (i = 0; i < LP5523_LEDS; i++) { /* Skip non-existing channels */ if (chip->pdata->led_config[i].led_current == 0) continue; /* Set default current */ lp5523_write(chip->client, LP5523_REG_LED_CURRENT_BASE + i, chip->pdata->led_config[i].led_current); lp5523_write(chip->client, LP5523_REG_LED_PWM_BASE + i, 0xff); /* let current stabilize 2 - 4ms before measurements start */ usleep_range(2000, 4000); lp5523_write(chip->client, LP5523_REG_LED_TEST_CTRL, LP5523_EN_LEDTEST | i); /* ADC conversion time is 2.7 ms typically */ usleep_range(3000, 6000); ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status); if (!(status & LP5523_LEDTEST_DONE)) usleep_range(3000, 6000);/* Was not ready. Wait. */ ret |= lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &adc); if (adc >= vdd || adc < LP5523_ADC_SHORTCIRC_LIM) pos += sprintf(buf + pos, "LED %d FAIL\n", i); lp5523_write(chip->client, LP5523_REG_LED_PWM_BASE + i, 0x00); /* Restore current */ lp5523_write(chip->client, LP5523_REG_LED_CURRENT_BASE + i, chip->leds[led].led_current); led++; } if (pos == 0) pos = sprintf(buf, "OK\n"); goto release_lock; fail: pos = sprintf(buf, "FAIL\n"); release_lock: mutex_unlock(&chip->lock); return pos; } static void lp5523_set_brightness(struct led_classdev *cdev, enum led_brightness brightness) { struct lp5523_led *led = cdev_to_led(cdev); led->brightness = (u8)brightness; schedule_work(&led->brightness_work); } static void lp5523_led_brightness_work(struct work_struct *work) { struct lp5523_led *led = container_of(work, struct lp5523_led, brightness_work); struct lp5523_chip *chip = led_to_lp5523(led); struct i2c_client *client = chip->client; mutex_lock(&chip->lock); lp5523_write(client, LP5523_REG_LED_PWM_BASE + led->chan_nr, led->brightness); mutex_unlock(&chip->lock); } static int lp5523_do_store_load(struct lp5523_engine *engine, const char *buf, size_t len) { struct lp5523_chip *chip = engine_to_lp5523(engine); struct i2c_client *client = chip->client; int ret, nrchars, offset = 0, i = 0; char c[3]; unsigned cmd; u8 pattern[LP5523_PROGRAM_LENGTH] = {0}; while ((offset < len - 1) && (i < LP5523_PROGRAM_LENGTH)) { /* separate sscanfs because length is working only for %s */ ret = sscanf(buf + offset, "%2s%n ", c, &nrchars); ret = sscanf(c, "%2x", &cmd); if (ret != 1) goto fail; pattern[i] = (u8)cmd; offset += nrchars; i++; } /* Each instruction is 16bit long. Check that length is even */ if (i % 2) goto fail; mutex_lock(&chip->lock); if (engine->mode == LP5523_CMD_LOAD) ret = lp5523_load_program(engine, pattern); else ret = -EINVAL; mutex_unlock(&chip->lock); if (ret) { dev_err(&client->dev, "failed loading pattern\n"); return ret; } return len; fail: dev_err(&client->dev, "wrong pattern format\n"); return -EINVAL; } static ssize_t store_engine_load(struct device *dev, struct device_attribute *attr, const char *buf, size_t len, int nr) { struct i2c_client *client = to_i2c_client(dev); struct lp5523_chip *chip = i2c_get_clientdata(client); return lp5523_do_store_load(&chip->engines[nr - 1], buf, len); } #define store_load(nr) \ static ssize_t store_engine##nr##_load(struct device *dev, \ struct device_attribute *attr, \ const char *buf, size_t len) \ { \ return store_engine_load(dev, attr, buf, len, nr); \ } store_load(1) store_load(2) store_load(3) static ssize_t show_engine_mode(struct device *dev, struct device_attribute *attr, char *buf, int nr) { struct i2c_client *client = to_i2c_client(dev); struct lp5523_chip *chip = i2c_get_clientdata(client); switch (chip->engines[nr - 1].mode) { case LP5523_CMD_RUN: return sprintf(buf, "run\n"); case LP5523_CMD_LOAD: return sprintf(buf, "load\n"); case LP5523_CMD_DISABLED: return sprintf(buf, "disabled\n"); default: return sprintf(buf, "disabled\n"); } } #define show_mode(nr) \ static ssize_t show_engine##nr##_mode(struct device *dev, \ struct device_attribute *attr, \ char *buf) \ { \ return show_engine_mode(dev, attr, buf, nr); \ } show_mode(1) show_mode(2) show_mode(3) static ssize_t store_engine_mode(struct device *dev, struct device_attribute *attr, const char *buf, size_t len, int nr) { struct i2c_client *client = to_i2c_client(dev); struct lp5523_chip *chip = i2c_get_clientdata(client); struct lp5523_engine *engine = &chip->engines[nr - 1]; mutex_lock(&chip->lock); if (!strncmp(buf, "run", 3)) lp5523_set_mode(engine, LP5523_CMD_RUN); else if (!strncmp(buf, "load", 4)) lp5523_set_mode(engine, LP5523_CMD_LOAD); else if (!strncmp(buf, "disabled", 8)) lp5523_set_mode(engine, LP5523_CMD_DISABLED); mutex_unlock(&chip->lock); return len; } #define store_mode(nr) \ static ssize_t store_engine##nr##_mode(struct device *dev, \ struct device_attribute *attr, \ const char *buf, size_t len) \ { \ return store_engine_mode(dev, attr, buf, len, nr); \ } store_mode(1) store_mode(2) store_mode(3) static ssize_t show_max_current(struct device *dev, struct device_attribute *attr, char *buf) { struct led_classdev *led_cdev = dev_get_drvdata(dev); struct lp5523_led *led = cdev_to_led(led_cdev); return sprintf(buf, "%d\n", led->max_current); } static ssize_t show_current(struct device *dev, struct device_attribute *attr, char *buf) { struct led_classdev *led_cdev = dev_get_drvdata(dev); struct lp5523_led *led = cdev_to_led(led_cdev); return sprintf(buf, "%d\n", led->led_current); } static ssize_t store_current(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { struct led_classdev *led_cdev = dev_get_drvdata(dev); struct lp5523_led *led = cdev_to_led(led_cdev); struct lp5523_chip *chip = led_to_lp5523(led); ssize_t ret; unsigned long curr; if (strict_strtoul(buf, 0, &curr)) return -EINVAL; if (curr > led->max_current) return -EINVAL; mutex_lock(&chip->lock); ret = lp5523_write(chip->client, LP5523_REG_LED_CURRENT_BASE + led->chan_nr, (u8)curr); mutex_unlock(&chip->lock); if (ret < 0) return ret; led->led_current = (u8)curr; return len; } /* led class device attributes */ static DEVICE_ATTR(led_current, S_IRUGO | S_IWUSR, show_current, store_current); static DEVICE_ATTR(max_current, S_IRUGO , show_max_current, NULL); static struct attribute *lp5523_led_attributes[] = { &dev_attr_led_current.attr, &dev_attr_max_current.attr, NULL, }; static struct attribute_group lp5523_led_attribute_group = { .attrs = lp5523_led_attributes }; /* device attributes */ static DEVICE_ATTR(engine1_mode, S_IRUGO | S_IWUSR, show_engine1_mode, store_engine1_mode); static DEVICE_ATTR(engine2_mode, S_IRUGO | S_IWUSR, show_engine2_mode, store_engine2_mode); static DEVICE_ATTR(engine3_mode, S_IRUGO | S_IWUSR, show_engine3_mode, store_engine3_mode); static DEVICE_ATTR(engine1_leds, S_IRUGO | S_IWUSR, show_engine1_leds, store_engine1_leds); static DEVICE_ATTR(engine2_leds, S_IRUGO | S_IWUSR, show_engine2_leds, store_engine2_leds); static DEVICE_ATTR(engine3_leds, S_IRUGO | S_IWUSR, show_engine3_leds, store_engine3_leds); static DEVICE_ATTR(engine1_load, S_IWUSR, NULL, store_engine1_load); static DEVICE_ATTR(engine2_load, S_IWUSR, NULL, store_engine2_load); static DEVICE_ATTR(engine3_load, S_IWUSR, NULL, store_engine3_load); static DEVICE_ATTR(selftest, S_IRUGO, lp5523_selftest, NULL); static struct attribute *lp5523_attributes[] = { &dev_attr_engine1_mode.attr, &dev_attr_engine2_mode.attr, &dev_attr_engine3_mode.attr, &dev_attr_selftest.attr, &dev_attr_engine1_load.attr, &dev_attr_engine1_leds.attr, &dev_attr_engine2_load.attr, &dev_attr_engine2_leds.attr, &dev_attr_engine3_load.attr, &dev_attr_engine3_leds.attr, }; static const struct attribute_group lp5523_group = { .attrs = lp5523_attributes, }; static int lp5523_register_sysfs(struct i2c_client *client) { struct device *dev = &client->dev; int ret; ret = sysfs_create_group(&dev->kobj, &lp5523_group); if (ret < 0) return ret; return 0; } static void lp5523_unregister_sysfs(struct i2c_client *client) { struct lp5523_chip *chip = i2c_get_clientdata(client); struct device *dev = &client->dev; int i; sysfs_remove_group(&dev->kobj, &lp5523_group); for (i = 0; i < chip->num_leds; i++) sysfs_remove_group(&chip->leds[i].cdev.dev->kobj, &lp5523_led_attribute_group); } /*--------------------------------------------------------------*/ /* Set chip operating mode */ /*--------------------------------------------------------------*/ static int lp5523_set_mode(struct lp5523_engine *engine, u8 mode) { int ret = 0; /* if in that mode already do nothing, except for run */ if (mode == engine->mode && mode != LP5523_CMD_RUN) return 0; if (mode == LP5523_CMD_RUN) { ret = lp5523_run_program(engine); } else if (mode == LP5523_CMD_LOAD) { lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED); lp5523_set_engine_mode(engine, LP5523_CMD_LOAD); } else if (mode == LP5523_CMD_DISABLED) { lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED); } engine->mode = mode; return ret; } /*--------------------------------------------------------------*/ /* Probe, Attach, Remove */ /*--------------------------------------------------------------*/ static int __init lp5523_init_engine(struct lp5523_engine *engine, int id) { if (id < 1 || id > LP5523_ENGINES) return -1; engine->id = id; engine->engine_mask = LP5523_ENG_MASK_BASE >> SHIFT_MASK(id); engine->prog_page = id - 1; engine->mux_page = id + 2; return 0; } static int __devinit lp5523_init_led(struct lp5523_led *led, struct device *dev, int chan, struct lp5523_platform_data *pdata) { char name[32]; int res; if (chan >= LP5523_LEDS) return -EINVAL; if (pdata->led_config[chan].led_current) { 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 >= LP5523_LEDS) { dev_err(dev, "Use channel numbers between 0 and %d\n", LP5523_LEDS - 1); return -EINVAL; } snprintf(name, sizeof(name), "%s:channel%d", pdata->label ?: "lp5523", chan); led->cdev.name = name; led->cdev.brightness_set = lp5523_set_brightness; res = led_classdev_register(dev, &led->cdev); if (res < 0) { dev_err(dev, "couldn't register led on channel %d\n", chan); return res; } res = sysfs_create_group(&led->cdev.dev->kobj, &lp5523_led_attribute_group); if (res < 0) { dev_err(dev, "couldn't register current attribute\n"); led_classdev_unregister(&led->cdev); return res; } } else { led->led_current = 0; } return 0; } static int __devinit lp5523_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct lp5523_chip *chip; struct lp5523_platform_data *pdata; int ret, i, led; chip = kzalloc(sizeof(*chip), GFP_KERNEL); if (!chip) return -ENOMEM; i2c_set_clientdata(client, chip); chip->client = client; pdata = client->dev.platform_data; if (!pdata) { dev_err(&client->dev, "no platform data\n"); ret = -EINVAL; goto fail1; } mutex_init(&chip->lock); chip->pdata = pdata; if (pdata->setup_resources) { ret = pdata->setup_resources(); if (ret < 0) goto fail1; } if (pdata->enable) { pdata->enable(0); usleep_range(1000, 2000); /* Keep enable down at least 1ms */ pdata->enable(1); usleep_range(1000, 2000); /* 500us abs min. */ } lp5523_write(client, LP5523_REG_RESET, 0xff); usleep_range(10000, 20000); /* * Exact value is not available. 10 - 20ms * appears to be enough for reset. */ ret = lp5523_detect(client); if (ret) goto fail2; dev_info(&client->dev, "LP5523 Programmable led chip found\n"); /* Initialize engines */ for (i = 0; i < ARRAY_SIZE(chip->engines); i++) { ret = lp5523_init_engine(&chip->engines[i], i + 1); if (ret) { dev_err(&client->dev, "error initializing engine\n"); goto fail2; } } ret = lp5523_configure(client); if (ret < 0) { dev_err(&client->dev, "error configuring chip\n"); goto fail2; } /* Initialize leds */ chip->num_channels = pdata->num_channels; chip->num_leds = 0; led = 0; for (i = 0; i < pdata->num_channels; i++) { /* Do not initialize channels that are not connected */ if (pdata->led_config[i].led_current == 0) continue; ret = lp5523_init_led(&chip->leds[led], &client->dev, i, pdata); if (ret) { dev_err(&client->dev, "error initializing leds\n"); goto fail3; } chip->num_leds++; chip->leds[led].id = led; /* Set LED current */ lp5523_write(client, LP5523_REG_LED_CURRENT_BASE + chip->leds[led].chan_nr, chip->leds[led].led_current); INIT_WORK(&(chip->leds[led].brightness_work), lp5523_led_brightness_work); led++; } ret = lp5523_register_sysfs(client); if (ret) { dev_err(&client->dev, "registering sysfs failed\n"); goto fail3; } return ret; fail3: for (i = 0; i < chip->num_leds; i++) { led_classdev_unregister(&chip->leds[i].cdev); cancel_work_sync(&chip->leds[i].brightness_work); } fail2: if (pdata->enable) pdata->enable(0); if (pdata->release_resources) pdata->release_resources(); fail1: kfree(chip); return ret; } static int lp5523_remove(struct i2c_client *client) { struct lp5523_chip *chip = i2c_get_clientdata(client); int i; lp5523_unregister_sysfs(client); for (i = 0; i < chip->num_leds; i++) { led_classdev_unregister(&chip->leds[i].cdev); cancel_work_sync(&chip->leds[i].brightness_work); } if (chip->pdata->enable) chip->pdata->enable(0); if (chip->pdata->release_resources) chip->pdata->release_resources(); kfree(chip); return 0; } static const struct i2c_device_id lp5523_id[] = { { "lp5523", 0 }, { } }; MODULE_DEVICE_TABLE(i2c, lp5523_id); static struct i2c_driver lp5523_driver = { .driver = { .name = "lp5523", }, .probe = lp5523_probe, .remove = lp5523_remove, .id_table = lp5523_id, }; module_i2c_driver(lp5523_driver); MODULE_AUTHOR("Mathias Nyman <mathias.nyman@nokia.com>"); MODULE_DESCRIPTION("LP5523 LED engine"); MODULE_LICENSE("GPL");