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openwrt/target/linux/mvebu/patches-3.14/003-add_leds_tlc59116_driver.patch
Imre Kaloz d775e4ef00 preliminary support for the WRT1900AC (work in progress) 
SVN-Revision: 41232
2014-06-17 15:13:10 +00:00

530 lines
14 KiB
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--- 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 <linux/module.h>
+#include <linux/delay.h>
+#include <linux/string.h>
+#include <linux/ctype.h>
+#include <linux/leds.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/workqueue.h>
+
+/* 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");
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