The chip can drive 2 sets of RGB leds. Controller can be controlled via PWM, I2C and audio synchronisation. This driver uses I2C to communicate with the chip. Datasheet: http://www.ti.com/lit/gpn/lp3952 Signed-off-by: Tony Makkiel <tony.makkiel@xxxxxxxxx> --- Changes from v8: - Removed macro LP3952_ACPI_NAME. - Replaced acpi_dev_get_property with device_property_read_string - Skip led class registration if led data couldn't be read from ACPI table. drivers/leds/Kconfig | 13 ++ drivers/leds/Makefile | 1 + drivers/leds/leds-lp3952.c | 306 ++++++++++++++++++++++++++++++++++++++++++++ include/linux/leds-lp3952.h | 125 ++++++++++++++++++ 4 files changed, 445 insertions(+) create mode 100644 drivers/leds/leds-lp3952.c create mode 100644 include/linux/leds-lp3952.h diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index 5ae2834..0f321f4 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -228,6 +228,19 @@ config LEDS_LP3944 To compile this driver as a module, choose M here: the module will be called leds-lp3944. +config LEDS_LP3952 + tristate "LED Support for TI LP3952 2 channel LED driver" + depends on LEDS_CLASS + depends on I2C + depends on ACPI + select REGMAP_I2C + help + This option enables support for LEDs connected to the Texas + Instruments LP3952 LED driver. + + To compile this driver as a module, choose M here: the + module will be called leds-lp3952. + config LEDS_LP55XX_COMMON tristate "Common Driver for TI/National LP5521/5523/55231/5562/8501" depends on LEDS_LP5521 || LEDS_LP5523 || LEDS_LP5562 || LEDS_LP8501 diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile index cb2013d..0684c86 100644 --- a/drivers/leds/Makefile +++ b/drivers/leds/Makefile @@ -26,6 +26,7 @@ obj-$(CONFIG_LEDS_PCA9532) += leds-pca9532.o obj-$(CONFIG_LEDS_GPIO_REGISTER) += leds-gpio-register.o obj-$(CONFIG_LEDS_GPIO) += leds-gpio.o obj-$(CONFIG_LEDS_LP3944) += leds-lp3944.o +obj-$(CONFIG_LEDS_LP3952) += leds-lp3952.o obj-$(CONFIG_LEDS_LP55XX_COMMON) += leds-lp55xx-common.o obj-$(CONFIG_LEDS_LP5521) += leds-lp5521.o obj-$(CONFIG_LEDS_LP5523) += leds-lp5523.o diff --git a/drivers/leds/leds-lp3952.c b/drivers/leds/leds-lp3952.c new file mode 100644 index 0000000..f8ac6ef --- /dev/null +++ b/drivers/leds/leds-lp3952.c @@ -0,0 +1,306 @@ +/* + * LED driver for TI lp3952 controller + * + * Copyright (C) 2016, DAQRI, LLC. + * Author: Tony Makkiel <tony.makkiel@xxxxxxxxx> + * + * 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. + * + */ + +#include <linux/acpi.h> +#include <linux/delay.h> +#include <linux/gpio.h> +#include <linux/i2c.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/leds.h> +#include <linux/leds-lp3952.h> +#include <linux/module.h> +#include <linux/notifier.h> +#include <linux/platform_device.h> +#include <linux/pm.h> +#include <linux/reboot.h> +#include <linux/regmap.h> + +static int lp3952_register_write(struct i2c_client *client, u8 reg, u8 val) +{ + int ret; + struct lp3952_led_array *priv = i2c_get_clientdata(client); + + ret = regmap_write(priv->regmap, reg, val); + + if (ret) + dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n", + __func__, reg, val, ret); + return ret; +} + +static void lp3952_on_off(struct lp3952_led_array *priv, + enum lp3952_leds led_id, int on) +{ + int ret, val; + + dev_dbg(&priv->client->dev, "%s LED %d to %d\n", __func__, led_id, on); + + val = 1 << led_id; + if (led_id == LP3952_LED_ALL) + val = LP3952_LED_MASK_ALL; + + ret = regmap_update_bits(priv->regmap, LP3952_REG_LED_CTRL, val, + on ? val : 0); + if (ret) + dev_err(&priv->client->dev, "%s, Error %d\n", __func__, ret); +} + +/* + * Using Imax to control brightness. There are 4 possible + * setting 25, 50, 75 and 100 % of Imax. Possible values are + * values 0-4. 0 meaning turn off. + */ +static int lp3952_set_brightness(struct led_classdev *cdev, + enum led_brightness value) +{ + unsigned int reg, shift_val; + struct lp3952_ctrl_hdl *led = container_of(cdev, + struct lp3952_ctrl_hdl, + cdev); + struct lp3952_led_array *priv = (struct lp3952_led_array *)led->priv; + + dev_dbg(cdev->dev, "Brightness request: %d on %d\n", value, + led->channel); + + if (value == LED_OFF) { + lp3952_on_off(priv, led->channel, LED_OFF); + return 0; + } + + if (led->channel > LP3952_RED_1) { + dev_err(cdev->dev, " %s Invalid LED requested", __func__); + return -EINVAL; + } + + if (led->channel >= LP3952_BLUE_1) { + reg = LP3952_REG_RGB1_MAX_I_CTRL; + shift_val = (led->channel - LP3952_BLUE_1) * 2; + } else { + reg = LP3952_REG_RGB2_MAX_I_CTRL; + shift_val = led->channel * 2; + } + + /* Enable the LED in case it is not enabled already */ + lp3952_on_off(priv, led->channel, 1); + + return regmap_update_bits(priv->regmap, reg, 3 << shift_val, + --value << shift_val); +} + +static int lp3952_get_label(struct device *dev, const char *label, char *dest) +{ + int ret; + const char *str; + + ret = device_property_read_string(dev, label, &str); + if (!ret) + strncpy(dest, str, LP3952_LABEL_MAX_LEN); + + return ret; +} + +static int lp3952_register_led_classdev(struct lp3952_led_array *priv) +{ + int i, acpi_ret, ret = -ENODEV; + static const char *led_name_hdl[LP3952_LED_ALL] = { + "blue2", + "green2", + "red2", + "blue1", + "green1", + "red1" + }; + + for (i = 0; i < LP3952_LED_ALL; i++) { + acpi_ret = lp3952_get_label(&priv->client->dev, led_name_hdl[i], + priv->leds[i].name); + if (acpi_ret) + continue; + + priv->leds[i].cdev.name = priv->leds[i].name; + priv->leds[i].cdev.brightness = LED_OFF; + priv->leds[i].cdev.max_brightness = LP3952_BRIGHT_MAX; + priv->leds[i].cdev.brightness_set_blocking = + lp3952_set_brightness; + priv->leds[i].channel = i; + priv->leds[i].priv = priv; + + ret = devm_led_classdev_register(&priv->client->dev, + &priv->leds[i].cdev); + if (ret < 0) { + dev_err(&priv->client->dev, + "couldn't register LED %s\n", + priv->leds[i].cdev.name); + break; + } + } + return ret; +} + +static int lp3952_set_pattern_gen_cmd(struct lp3952_led_array *priv, + u8 cmd_index, u8 r, u8 g, u8 b, + enum lp3952_tt tt, enum lp3952_cet cet) +{ + int ret; + struct ptrn_gen_cmd line = { + .r = r, + .g = g, + .b = b, + .cet = cet, + .tt = tt + }; + + if (cmd_index >= LP3952_CMD_REG_COUNT) + return -EINVAL; + + ret = lp3952_register_write(priv->client, + LP3952_REG_CMD_0 + cmd_index * 2, + line.bytes.msb); + if (ret) + return ret; + + return (lp3952_register_write(priv->client, + LP3952_REG_CMD_0 + cmd_index * 2 + 1, + line.bytes.lsb)); +} + +static int lp3952_configure(struct lp3952_led_array *priv) +{ + int ret; + + /* Disable any LEDs on from any previous conf. */ + ret = lp3952_register_write(priv->client, LP3952_REG_LED_CTRL, 0); + if (ret) + return ret; + + /* enable rgb patter, loop */ + ret = lp3952_register_write(priv->client, LP3952_REG_PAT_GEN_CTRL, + LP3952_PATRN_LOOP | LP3952_PATRN_GEN_EN); + if (ret) + return ret; + + /* Update Bit 6 (Active mode), Select both Led sets, Bit [1:0] */ + ret = lp3952_register_write(priv->client, LP3952_REG_ENABLES, + LP3952_ACTIVE_MODE | LP3952_INT_B00ST_LDR); + if (ret) + return ret; + + /* Set Cmd1 for RGB intensity,cmd and transition time */ + return (lp3952_set_pattern_gen_cmd(priv, 0, I46, I71, I100, TT0, + CET197)); +} + +static const struct regmap_config lp3952_regmap = { + .reg_bits = 8, + .val_bits = 8, + .max_register = REG_MAX, + .cache_type = REGCACHE_RBTREE, +}; + +static int lp3952_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + int status; + struct lp3952_ctrl_hdl *leds; + struct lp3952_led_array *priv; + + priv = devm_kzalloc(&client->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + leds = devm_kcalloc(&client->dev, LP3952_LED_ALL, sizeof(*leds), + GFP_KERNEL); + if (!leds) { + devm_kfree(&client->dev, priv); + return -ENOMEM; + } + + priv->leds = leds; + priv->client = client; + + priv->enable_gpio = devm_gpiod_get(&client->dev, "nrst", + GPIOD_OUT_HIGH); + if (IS_ERR(priv->enable_gpio)) { + status = PTR_ERR(priv->enable_gpio); + dev_err(&client->dev, "Failed to enable gpio: %d\n", status); + return status; + } + + priv->regmap = devm_regmap_init_i2c(client, &lp3952_regmap); + if (IS_ERR(priv->regmap)) { + int err = PTR_ERR(priv->regmap); + + dev_err(&client->dev, "Failed to allocate register map: %d\n", + err); + return err; + } + + i2c_set_clientdata(client, priv); + + status = lp3952_configure(priv); + if (status) { + dev_err(&client->dev, "Probe failed. Device not found (%d)\n", + status); + return status; + } + + status = lp3952_register_led_classdev(priv); + if (status) { + dev_err(&client->dev, "Unable to register led_classdev: %d\n", + status); + return status; + } + + return 0; +} + +static int lp3952_remove(struct i2c_client *client) +{ + struct lp3952_led_array *priv; + + priv = i2c_get_clientdata(client); + lp3952_on_off(priv, LP3952_LED_ALL, 0); + gpiod_set_value(priv->enable_gpio, 0); + + return 0; +} + +static const struct i2c_device_id lp3952_id[] = { + {LP3952_NAME, 0}, + {} +}; + +#ifdef CONFIG_ACPI +static const struct acpi_device_id lp3952_acpi_match[] = { + {"TXNW3952", 0}, + {} +}; + +MODULE_DEVICE_TABLE(acpi, lp3952_acpi_match); +#endif + +static struct i2c_driver lp3952_i2c_driver = { + .driver = { + .name = LP3952_NAME, + .acpi_match_table = ACPI_PTR(lp3952_acpi_match), + }, + .probe = lp3952_probe, + .remove = lp3952_remove, + .id_table = lp3952_id, +}; + +module_i2c_driver(lp3952_i2c_driver); + +MODULE_AUTHOR("Tony Makkiel <tony.makkiel@xxxxxxxxx>"); +MODULE_DESCRIPTION("lp3952 I2C LED controller driver"); +MODULE_LICENSE("GPL v2"); diff --git a/include/linux/leds-lp3952.h b/include/linux/leds-lp3952.h new file mode 100644 index 0000000..edd5ed6 --- /dev/null +++ b/include/linux/leds-lp3952.h @@ -0,0 +1,125 @@ +/* + * LED driver for TI lp3952 controller + * + * Copyright (C) 2016, DAQRI, LLC. + * Author: Tony Makkiel <tony.makkiel@xxxxxxxxx> + * + * 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. + * + */ + +#ifndef LEDS_LP3952_H_ +#define LEDS_LP3952_H_ + +#define LP3952_NAME "lp3952" +#define LP3952_CMD_REG_COUNT 8 +#define LP3952_BRIGHT_MAX 4 +#define LP3952_LABEL_MAX_LEN 15 + +#define LP3952_REG_LED_CTRL 0x00 +#define LP3952_REG_R1_BLNK_TIME_CTRL 0x01 +#define LP3952_REG_R1_BLNK_CYCLE_CTRL 0x02 +#define LP3952_REG_G1_BLNK_TIME_CTRL 0x03 +#define LP3952_REG_G1_BLNK_CYCLE_CTRL 0x04 +#define LP3952_REG_B1_BLNK_TIME_CTRL 0x05 +#define LP3952_REG_B1_BLNK_CYCLE_CTRL 0x06 +#define LP3952_REG_ENABLES 0x0B +#define LP3952_REG_PAT_GEN_CTRL 0x11 +#define LP3952_REG_RGB1_MAX_I_CTRL 0x12 +#define LP3952_REG_RGB2_MAX_I_CTRL 0x13 +#define LP3952_REG_CMD_0 0x50 +#define LP3952_REG_RESET 0x60 +#define REG_MAX LP3952_REG_RESET + +#define LP3952_PATRN_LOOP BIT(1) +#define LP3952_PATRN_GEN_EN BIT(2) +#define LP3952_INT_B00ST_LDR BIT(2) +#define LP3952_ACTIVE_MODE BIT(6) +#define LP3952_LED_MASK_ALL 0x3f + +/* Transition Time in ms */ +enum lp3952_tt { + TT0, + TT55, + TT110, + TT221, + TT422, + TT885, + TT1770, + TT3539 +}; + +/* Command Execution Time in ms */ +enum lp3952_cet { + CET197, + CET393, + CET590, + CET786, + CET1180, + CET1376, + CET1573, + CET1769, + CET1966, + CET2163, + CET2359, + CET2556, + CET2763, + CET2949, + CET3146 +}; + +/* Max Current in % */ +enum lp3952_colour_I_log_0 { + I0, + I7, + I14, + I21, + I32, + I46, + I71, + I100 +}; + +enum lp3952_leds { + LP3952_BLUE_2, + LP3952_GREEN_2, + LP3952_RED_2, + LP3952_BLUE_1, + LP3952_GREEN_1, + LP3952_RED_1, + LP3952_LED_ALL +}; + +struct lp3952_ctrl_hdl { + struct led_classdev cdev; + char name[LP3952_LABEL_MAX_LEN]; + enum lp3952_leds channel; + void *priv; +}; + +struct ptrn_gen_cmd { + union { + struct { + u16 tt:3; + u16 b:3; + u16 cet:4; + u16 g:3; + u16 r:3; + }; + struct { + u8 lsb; + u8 msb; + } bytes; + }; +} __packed; + +struct lp3952_led_array { + struct regmap *regmap; + struct i2c_client *client; + struct gpio_desc *enable_gpio; + struct lp3952_ctrl_hdl *leds; +}; + +#endif /* LEDS_LP3952_H_ */ -- 2.7.4 -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
