| /* |
| * 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) |
| |
| enum lp5523_chip_id { |
| LP5523, |
| LP55231, |
| }; |
| |
| 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 void 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, const 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, LP5523_ENABLE); |
| 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 */ |
| static const 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, const 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 = min_t(int, 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}; |
| |
| if (engine->mode != LP5523_CMD_LOAD) |
| return -EINVAL; |
| |
| 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); |
| ret = lp5523_load_program(engine, pattern); |
| 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 void lp5523_set_mode(struct lp5523_engine *engine, u8 mode) |
| { |
| /* if in that mode already do nothing, except for run */ |
| if (mode == engine->mode && mode != LP5523_CMD_RUN) |
| return; |
| |
| switch (mode) { |
| case LP5523_CMD_RUN: |
| lp5523_run_program(engine); |
| break; |
| case LP5523_CMD_LOAD: |
| lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED); |
| lp5523_set_engine_mode(engine, LP5523_CMD_LOAD); |
| break; |
| case LP5523_CMD_DISABLED: |
| lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED); |
| break; |
| default: |
| return; |
| } |
| |
| engine->mode = mode; |
| } |
| |
| /*--------------------------------------------------------------*/ |
| /* 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, |
| const char *chip_name) |
| { |
| 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; |
| } |
| |
| 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_name, 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 = devm_kzalloc(&client->dev, 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"); |
| return -EINVAL; |
| } |
| |
| mutex_init(&chip->lock); |
| |
| chip->pdata = pdata; |
| |
| if (pdata->setup_resources) { |
| ret = pdata->setup_resources(); |
| if (ret < 0) |
| return ret; |
| } |
| |
| 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 fail1; |
| |
| dev_info(&client->dev, "%s Programmable led chip found\n", id->name); |
| |
| /* 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 fail1; |
| } |
| } |
| ret = lp5523_configure(client); |
| if (ret < 0) { |
| dev_err(&client->dev, "error configuring chip\n"); |
| goto fail1; |
| } |
| |
| /* 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; |
| |
| INIT_WORK(&chip->leds[led].brightness_work, |
| lp5523_led_brightness_work); |
| |
| ret = lp5523_init_led(&chip->leds[led], &client->dev, i, pdata, |
| id->name); |
| if (ret) { |
| dev_err(&client->dev, "error initializing leds\n"); |
| goto fail2; |
| } |
| 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); |
| |
| led++; |
| } |
| |
| ret = lp5523_register_sysfs(client); |
| if (ret) { |
| dev_err(&client->dev, "registering sysfs failed\n"); |
| goto fail2; |
| } |
| return ret; |
| fail2: |
| for (i = 0; i < chip->num_leds; i++) { |
| led_classdev_unregister(&chip->leds[i].cdev); |
| flush_work(&chip->leds[i].brightness_work); |
| } |
| fail1: |
| if (pdata->enable) |
| pdata->enable(0); |
| if (pdata->release_resources) |
| pdata->release_resources(); |
| 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); |
| flush_work(&chip->leds[i].brightness_work); |
| } |
| |
| if (chip->pdata->enable) |
| chip->pdata->enable(0); |
| if (chip->pdata->release_resources) |
| chip->pdata->release_resources(); |
| return 0; |
| } |
| |
| static const struct i2c_device_id lp5523_id[] = { |
| { "lp5523", LP5523 }, |
| { "lp55231", LP55231 }, |
| { } |
| }; |
| |
| MODULE_DEVICE_TABLE(i2c, lp5523_id); |
| |
| static struct i2c_driver lp5523_driver = { |
| .driver = { |
| .name = "lp5523x", |
| }, |
| .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"); |