--- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -487,6 +487,15 @@ config LEDS_BLINKM This option enables support for the BlinkM RGB LED connected through I2C. Say Y to enable support for the BlinkM LED. +config LEDS_TLC59116 + tristate "LED driver for TLC59116F dimmer" + depends on LEDS_CLASS + depends on I2C + help + This option enables support for Texas Instruments TLC59116F + LED controller. It is generally only useful + as a platform driver + comment "LED Triggers" source "drivers/leds/trigger/Kconfig" --- a/drivers/leds/Makefile +++ b/drivers/leds/Makefile @@ -54,6 +54,7 @@ obj-$(CONFIG_LEDS_ASIC3) += leds-asic3. obj-$(CONFIG_LEDS_MAX8997) += leds-max8997.o obj-$(CONFIG_LEDS_LM355x) += leds-lm355x.o obj-$(CONFIG_LEDS_BLINKM) += leds-blinkm.o +obj-$(CONFIG_LEDS_TLC59116) += leds-tlc59116.o # LED SPI Drivers obj-$(CONFIG_LEDS_DAC124S085) += leds-dac124s085.o --- /dev/null +++ b/drivers/leds/leds-tlc59116.c @@ -0,0 +1,498 @@ +/* + * Copyright 2014 Belkin Inc. + * + * Author: Belkin Inc. + * + * This file is subject to the terms and conditions of version 2 of + * the GNU General Public License. See the file COPYING in the main + * directory of this archive for more details. + * + * LED driver for various TLC59116 I2C LED drivers + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +/* LED select registers determine the source that drives LED outputs */ +#define TLC59116_LED_OFF 0x0 /* Output LOW */ +#define TLC59116_LED_ON 0x1 /* Output HI-Z */ +#define TLC59116_DIM 0x2 /* Dimming */ +#define TLC59116_BLINK 0x3 /* Blinking */ + +#define TLC59116_PINS 16 +#define TLC59116_REG_MODE1 0x00 /* Mode register 0 */ +#define MODE1_RESPON_ADDR_MASK 0xF0 +#define MODE1_NORMAL_MODE (0 << 4) +#define MODE1_SPEED_MODE (1 << 4) + +#define TLC59116_REG_MODE2 0x01 /* Mode register 1 */ +#define MODE2_DIM (0 << 5) +#define MODE2_BLINK (1 << 5) +#define MODE2_OCH_STOP (0 << 3) +#define MODE2_OCH_ACK (1 << 3) + +#define TLC59116_REG_PWM0 0x02 +#define TLC59116_REG_PWM1 0x03 +#define TLC59116_REG_PWM2 0x04 +#define TLC59116_REG_PWM3 0x05 +#define TLC59116_REG_PWM4 0x06 +#define TLC59116_REG_PWM5 0x07 +#define TLC59116_REG_PWM6 0x08 +#define TLC59116_REG_PWM7 0x09 +#define TLC59116_REG_PWM8 0x0a +#define TLC59116_REG_PWM9 0x0b +#define TLC59116_REG_PWM10 0x0c +#define TLC59116_REG_PWM11 0x0d +#define TLC59116_REG_PWM12 0x0e +#define TLC59116_REG_PWM13 0x0f +#define TLC59116_REG_PWM14 0x10 +#define TLC59116_REG_PWM15 0x01 + +#define TLC59116_REG_GRPPWM 0x12 +#define TLC59116_REG_GRPFREQ 0x13 + +#define TLC59116_PERIOD_MIN 41 /* 41ms */ +#define TLC59116_PERIOD_MAX 10730 /* 10.73s */ + +#define TLC59116_REG_LEDOUT0 0x14 /* LED [3:0] driver output state registers */ +#define TLC59116_REG_LEDOUT1 0x15 /* LED [7:4] driver output state registers */ +#define TLC59116_REG_LEDOUT2 0x16 /* LED [11:8] driver output state registers */ +#define TLC59116_REG_LEDOUT3 0x17 /* LED [15:12] driver output state registers */ + +#define GPIO0_MASK 0x3 + +#define DEBUG 0 + +#if DEBUG > 1 +#define led_dbg(fmt, arg...) printk(KERN_DEBUG "tlc59116:%s " fmt "\n", __func__ , ## arg) +#else +#define led_dbg(fmt, arg...) +#endif + + +#if DEBUG > 0 +#define led_info(fmt, arg...) printk("tlc59116:%s " fmt "\n", __func__ , ## arg) +#else +#define led_info(fmt, arg...) +#endif + +enum tlc59116_type { + tlc59116, +}; + +struct tlc59116_chipdef { + int bits; + u8 slv_addr; /* 7-bit slave address mask */ + int slv_addr_shift; /* Number of bits to ignore */ +}; + +static struct tlc59116_chipdef tlc59116_chipdefs[] = { + [tlc59116] = { + .bits = 16, + .slv_addr = /* 1100xxx */ 0x68, + .slv_addr_shift = 3, + }, +}; + +static const struct i2c_device_id tlc59116_id[] = { + { "tlc59116", tlc59116 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, tlc59116_id); + +struct tlc59116_led { + struct tlc59116_chipdef *chipdef; + struct i2c_client *client; + struct work_struct work; + spinlock_t lock; + enum led_brightness brightness; + struct led_classdev led_cdev; + int led_num; /* 0 .. 8 potentially */ + char name[32]; +}; + +//#define DUMP_REGS + +#ifdef DUMP_REGS +void dump_regs(struct i2c_client *client) +{ + int i, j = 0; + u8 data; + printk ("\n-------------------------------------\n"); + for (i = 0; i< 0x20; i++) + { + data = i2c_smbus_read_byte_data(client, i); + printk ("[0x%x] = 0x%x ",i, data); + j++; + if (j == 5) + { + printk ("\n"); + j = 0; + } + } + printk ("\n"); +} +#endif + +static int tlc59116_set_mode(struct i2c_client *client, uint8_t mode) +{ + uint8_t val = 0; + + if ((mode != MODE2_DIM) && (mode != MODE2_BLINK)) + mode = MODE2_DIM; + + /* Configure MODE1 register */ + val &= 0x0; + val &= MODE1_RESPON_ADDR_MASK; + val |= MODE1_NORMAL_MODE; + i2c_smbus_write_byte_data(client, TLC59116_REG_MODE1, val); + + /* Configure MODE2 Reg */ + val &= 0x00; + val |= MODE2_OCH_STOP; + + val |= mode; + + i2c_smbus_write_byte_data(client, TLC59116_REG_MODE2, val); + mdelay(100); + + return 0; +} + +static int tlc59116_set_gpio_act(struct i2c_client *client, u8 gpio_no, u8 act_mode) +{ + char data, addr = 0, i; + + if ((gpio_no >= 0) && (gpio_no < 4)) + addr = TLC59116_REG_LEDOUT0; + else if ((gpio_no >= 4) && (gpio_no < 8)) + addr = TLC59116_REG_LEDOUT1; + else if ((gpio_no >= 8) && (gpio_no < 12)) + addr = TLC59116_REG_LEDOUT2; + else if ((gpio_no >=12 ) && (gpio_no < 16)) + addr = TLC59116_REG_LEDOUT3; + + data = i2c_smbus_read_byte_data(client, addr); + + i = (gpio_no % 4) * 2; + + data &= ~(GPIO0_MASK << i); + act_mode = act_mode << i; + data |= act_mode; + + if(i2c_smbus_write_byte_data(client, addr, data) != 0) { + return -1; + } + return 0; +} + +static int tlc59116_set_gpio(struct i2c_client *client, uint8_t gpio_no, uint8_t val) +{ + val &= 0x03; + tlc59116_set_gpio_act(client, gpio_no, val); +#ifdef DUMP_REGS + dump_regs(client); +#endif + return 0; +} + +static int tlc59116_get_gpio(struct i2c_client *client, uint8_t gpio_no) +{ + uint8_t val, reg, data; + + led_dbg("gpio = %d\n", gpio_no); + reg = TLC59116_REG_LEDOUT0; + + if ((gpio_no >= 0) && (gpio_no < 4)) + reg = TLC59116_REG_LEDOUT0; + else if ((gpio_no >= 4) && (gpio_no < 8)) { + reg = TLC59116_REG_LEDOUT1; + gpio_no = gpio_no - 4; + } + else if ((gpio_no >= 8) && (gpio_no < 12)) { + reg = TLC59116_REG_LEDOUT2; + gpio_no = gpio_no - 8; + } + else if ((gpio_no >=12 ) && (gpio_no < 16)) { + reg = TLC59116_REG_LEDOUT3; + gpio_no = gpio_no - 12; + } + + val = i2c_smbus_read_byte_data(client, reg); + + data = (val >> (gpio_no * 2)) & 0x03; + return data; +} + +/* + * gpio_no [0..7] + * duty_cycle [0..99]% + * + * */ +static int tlc59116_individual_brighness_control(struct i2c_client *client, uint8_t gpio_no, uint8_t brightness) +{ + uint8_t pwm; + + pwm = gpio_no + TLC59116_REG_PWM0; + i2c_smbus_write_byte_data(client, pwm, brightness); + + return 0; +} + +static void tlc59116_led_work(struct work_struct *work) +{ + struct tlc59116_led *tlc59116; + + tlc59116 = container_of(work, struct tlc59116_led, work); + + led_dbg("\nbrighness = %d \n", tlc59116->brightness); + switch (tlc59116->brightness) { + case LED_OFF: + led_info("\nLed off\n"); + tlc59116_set_gpio(tlc59116->client, tlc59116->led_num, TLC59116_LED_OFF); + break; + + case LED_FULL: + led_info("\nLed on\n"); + tlc59116_set_gpio(tlc59116->client, tlc59116->led_num, TLC59116_LED_ON); + break; + default: + led_info("\nBrightness is %d\n", tlc59116->brightness); + if (TLC59116_BLINK != tlc59116_get_gpio(tlc59116->client, tlc59116->led_num)) + tlc59116_set_gpio(tlc59116->client, tlc59116->led_num, TLC59116_DIM); + + tlc59116_individual_brighness_control(tlc59116->client, tlc59116->led_num, tlc59116->brightness); + break; + } + +} + +static void tlc59116_led_set(struct led_classdev *led_cdev, enum led_brightness value) +{ + struct tlc59116_led *tlc59116; + + tlc59116 = container_of(led_cdev, struct tlc59116_led, led_cdev); + + spin_lock(&tlc59116->lock); + tlc59116->brightness = value; + + /* + * Must use workqueue for the actual I/O since I2C operations + * can sleep. + */ + schedule_work(&tlc59116->work); + + spin_unlock(&tlc59116->lock); +} + +/* + * delay_on, delay_off: units are in ms + * + */ + +static int tlc59116_set_blink(struct led_classdev *led_cdev, + unsigned long *delay_on, + unsigned long *delay_off) +{ + struct tlc59116_led *tlc59116; + uint16_t period; + uint16_t duty_cycle; + uint8_t gdc; + uint8_t gfrq; + + tlc59116 = container_of(led_cdev, struct tlc59116_led, led_cdev); + led_info ("Blinking: delay_on = %ldms, delay_off = %ldms, brightness = %d\n", + *delay_on, *delay_off, tlc59116->brightness); + + // Hardware blinking only for tricolor leds . The rest will have software blinking + if (tlc59116->led_num > 2) + return 1; + + if ((*delay_on == 0) && (*delay_off ==0)) { + spin_lock(&tlc59116->lock); + + /* MODE2[DMBLNK] = 1 */ + tlc59116_set_mode(tlc59116->client, MODE2_BLINK); + + /* Set LDRx = 11 */ + tlc59116_set_gpio(tlc59116->client, tlc59116->led_num, TLC59116_BLINK); + + tlc59116_individual_brighness_control(tlc59116->client, tlc59116->led_num, tlc59116->brightness); + spin_unlock(&tlc59116->lock); + return 0; + } + + + if ((*delay_on + *delay_off) > TLC59116_PERIOD_MAX) + { + led_dbg ("Max period is %dms\n", TLC59116_PERIOD_MAX); + return -EINVAL; + } + + if ((*delay_on + *delay_off) < TLC59116_PERIOD_MIN) + { + *delay_on = TLC59116_PERIOD_MIN/2 + 1; + *delay_off = TLC59116_PERIOD_MIN/2 + 1; + } + period = (*delay_on) + (*delay_off); + + duty_cycle = (100 * (*delay_on)) / period; + + spin_lock(&tlc59116->lock); + + /* MODE2[DMBLNK] = 1 */ + tlc59116_set_mode(tlc59116->client, MODE2_BLINK); + + /* Set LDRx = 11 */ + tlc59116_set_gpio(tlc59116->client, tlc59116->led_num, TLC59116_BLINK); + + tlc59116_individual_brighness_control(tlc59116->client, tlc59116->led_num, tlc59116->brightness); + + gdc = (duty_cycle * 256)/100; + i2c_smbus_write_byte_data(tlc59116->client, TLC59116_REG_GRPPWM, gdc); + + gfrq = (24 * period)/1000 - 1; /* unit is in second (convert from ms to second) */ + i2c_smbus_write_byte_data(tlc59116->client, TLC59116_REG_GRPFREQ, gfrq); + + +#ifdef DUMP_REGS + dump_regs(tlc59116->client); +#endif + + spin_unlock(&tlc59116->lock); + return 0; +} + +static int tlc59116_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct tlc59116_led *tlc59116; + struct tlc59116_chipdef *chip; + struct i2c_adapter *adapter; + struct led_platform_data *pdata; + int i, err; + + chip = &tlc59116_chipdefs[id->driver_data]; + adapter = to_i2c_adapter(client->dev.parent); + pdata = client->dev.platform_data; + + /* Make sure the slave address / chip type combo given is possible */ + if ((client->addr & ~((1 << chip->slv_addr_shift) - 1)) != + chip->slv_addr) { + dev_err(&client->dev, "invalid slave address %02x\n", + client->addr); + return -ENODEV; + } + + printk(KERN_INFO "leds-tlc59116: Using %s %d-bit LED driver at " + "slave address 0x%02x\n", + id->name, chip->bits, client->addr); + + if (!i2c_check_functionality(adapter, I2C_FUNC_I2C)) + return -EIO; + + if (pdata) { + if (pdata->num_leds != chip->bits) { + dev_err(&client->dev, "board info claims %d LEDs" + " on a %d-bit chip\n", + pdata->num_leds, chip->bits); + return -ENODEV; + } + } + + tlc59116 = devm_kzalloc(&client->dev, sizeof(*tlc59116) * chip->bits, GFP_KERNEL); + if (!tlc59116) + return -ENOMEM; + + i2c_set_clientdata(client, tlc59116); + + for (i = 0; i < chip->bits; i++) { + tlc59116[i].chipdef = chip; + tlc59116[i].client = client; + tlc59116[i].led_num = i; + + /* Platform data can specify LED names and default triggers */ + if (pdata) { + if (pdata->leds[i].name) + snprintf(tlc59116[i].name, + sizeof(tlc59116[i].name), "tlc59116:%s", + pdata->leds[i].name); + if (pdata->leds[i].default_trigger) + tlc59116[i].led_cdev.default_trigger = + pdata->leds[i].default_trigger; + } else { + snprintf(tlc59116[i].name, sizeof(tlc59116[i].name), + "tlc59116:%d", i); + } + + spin_lock_init(&tlc59116[i].lock); + + tlc59116[i].led_cdev.name = tlc59116[i].name; + tlc59116[i].led_cdev.brightness_set = tlc59116_led_set; + tlc59116[i].led_cdev.blink_set = tlc59116_set_blink; + tlc59116[i].led_cdev.brightness = 0; + + INIT_WORK(&tlc59116[i].work, tlc59116_led_work); + + err = led_classdev_register(&client->dev, &tlc59116[i].led_cdev); + if (err < 0) + goto exit; + } + + tlc59116_set_mode(client, MODE2_DIM); + + /* Turn off LEDs */ + for (i = 0; i < chip->bits; i++) + tlc59116_set_gpio(client, i, TLC59116_LED_OFF); + + return 0; + +exit: + while (i--) { + led_classdev_unregister(&tlc59116[i].led_cdev); + cancel_work_sync(&tlc59116[i].work); + } + + devm_kfree(&client->dev, tlc59116); + i2c_set_clientdata(client, NULL); + + return err; +} + +static int tlc59116_remove(struct i2c_client *client) +{ + struct tlc59116_led *tlc59116 = i2c_get_clientdata(client); + int i; + + for (i = 0; i < tlc59116->chipdef->bits; i++) { + led_classdev_unregister(&tlc59116[i].led_cdev); + cancel_work_sync(&tlc59116[i].work); + } + + devm_kfree(&client->dev, tlc59116); + i2c_set_clientdata(client, NULL); + + return 0; +} + +static struct i2c_driver tlc59116_driver = { + .driver = { + .name = "leds-tlc59116", + .owner = THIS_MODULE, + }, + .probe = tlc59116_probe, + .remove = tlc59116_remove, + .id_table = tlc59116_id, +}; + +module_i2c_driver(tlc59116_driver); + +MODULE_AUTHOR("Belkin Inc."); +MODULE_DESCRIPTION("TLC59116 LED driver"); +MODULE_LICENSE("GPL v2");