Datasheet: http://www.ti.com/lit/gpn/lp3952 The chip can drive 2 sets of RGB leds. Controller can be controlled via PWM, I2C and audio sychnronisation. This driver use I2C to communicate with chip. Signed-off-by: Tony Makkiel <tony.makkiel@xxxxxxxxx> --- drivers/leds/Kconfig | 12 ++ drivers/leds/Makefile | 1 + drivers/leds/leds-lp3952.c | 411 ++++++++++++++++++++++++++++++++++++++++++++ include/linux/leds-lp3952.h | 89 ++++++++++ 4 files changed, 513 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..305faf9 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -228,6 +228,18 @@ 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 + 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..8229d5a --- /dev/null +++ b/drivers/leds/leds-lp3952.c @@ -0,0 +1,411 @@ +/* + * Copyright (c) 2016, DAQRI, LLC. + * + * License Terms: GNU General Public License v2 + * + * leds-lp3952 - LED class driver for TI lp3952 controller + * + * Based on: + * leds-tlc9516 - LED class driver for TLC95XX series + * of I2C driven LED controllers from NXP + * + * Derived from leds-atmel-pwm, leds-bd2802 and initial PWM led 3952 + * driver written by Alex Feinman + * + * 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. + * + */ + +/*#define DEBUG 1*/ + +#include <linux/io.h> +#include <linux/pm.h> +#include <linux/i2c.h> +#include <linux/gpio.h> +#include <linux/leds.h> +#include <linux/acpi.h> +#include <linux/delay.h> +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/reboot.h> +#include <linux/regmap.h> +#include <linux/notifier.h> +#include <linux/platform_device.h> +#include <linux/leds-lp3952.h> + +#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 + +struct lp3952_ctrl_hdl { + struct led_classdev cdev; + char name[10]; + 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; + }; +} __attribute__ ((packed)); + +struct lp3952_led_array { + u8 ndev; + u32 enable_gpio; + struct regmap *regmap; + struct i2c_client *client; + struct ptrn_gen_cmd pgm[8]; + struct lp3952_ctrl_hdl *leds; +}; + +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; +} + +int lp3952_register_read(struct i2c_client *client, u8 reg, u8 len, + u8 *valarray) +{ + struct lp3952_led_array *priv = i2c_get_clientdata(client); + int ret = regmap_bulk_read(priv->regmap, reg, valarray, len); + + if (ret < 0) + dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n", + __func__, reg, valarray[0], ret); + return ret; +} + +static void lp3952_on_off(struct lp3952_led_array *priv, enum lp3952_leds led, + int on) +{ + int val = 1 << led; + + dev_dbg(&priv->client->dev, "%s LED %d to %d\n", __func__, led, on); + if (LP3952_LED_ALL == led) + val = 0x3f; + + regmap_update_bits(priv->regmap, LP3952_REG_LED_CTRL, val, + on ? val : 0); +} + +/* + * 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 lp3952_brightness b) +{ + unsigned int reg, val, shiftVal; + 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", b, led->channel); + + if (LP3952_OFF == b) { + lp3952_on_off(priv, led->channel, LP3952_OFF); + return 0; + } + + val = b - 1; + reg = LP3952_REG_RGB1_MAX_I_CTRL; + shiftVal = (led->channel - LP3952_BLUE_1) * 2; + + if (led->channel > LP3952_RED_1) { + dev_err(cdev->dev, " %s Invalid LED requested", __func__); + return -EINVAL; + } else if (led->channel < LP3952_BLUE_1) { + shiftVal = led->channel * 2; + reg = LP3952_REG_RGB2_MAX_I_CTRL; + } + /* 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 << shiftVal, + val << shiftVal)); +} + +static void lp3952_brightness_ctrl(struct led_classdev *cdev, + enum led_brightness b) +{ + int range = LED_HALF / 2; + enum lp3952_brightness val = LP3952_FULL_BRIGHT; + + dev_dbg(cdev->dev, "Requested Brightness %d\n", b); + + if (LED_OFF == b) + val = LP3952_OFF; + else if (b < (LED_HALF - range)) + val = LP3952_QUARTER_BRIGHT; + else if (b <= LED_HALF) + val = LP3952_HALF_BRIGHT; + else if (b <= LED_HALF + range) + val = LP3952_THREE_QRTR_BRIGHT; + + lp3952_set_brightness(cdev, val); +} + +static int lp3952_register_led_classdev(struct lp3952_led_array *priv) +{ + int ret, i; + const char *led_name[] = { + "blue2", + "green2", + "red2", + "blue1", + "green1", + "red1" + }; + + for (i = 0; i < priv->ndev; i++) { + sprintf(priv->leds[i].name, "%s", led_name[i]); + priv->leds[i].cdev.name = priv->leds[i].name; + priv->leds[i].cdev.brightness = LED_OFF; + priv->leds[i].cdev.max_brightness = LED_FULL; + priv->leds[i].cdev.brightness_set_blocking = + lp3952_brightness_ctrl; + priv->leds[i].channel = i; + priv->leds[i].priv = priv; + + ret = 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); + goto error; + } + } + return 0; + +error: + for (; i >= 0; i--) + led_classdev_unregister(&priv->leds[i].cdev); + return ret; +} + +static void lp3952_unregister_led_classdev(struct lp3952_led_array *priv) +{ + int i; + + for (i = 0; i < priv->ndev; i++) + led_classdev_unregister(&priv->leds[i].cdev); +} + +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) +{ + struct ptrn_gen_cmd line = { + .r = r, + .g = g, + .b = b, + .cet = cet, + .tt = tt + }; + if (cmd_index >= 8) + return -EINVAL; + + priv->pgm[cmd_index] = line; + lp3952_register_write(priv->client, LP3952_REG_CMD_0 + cmd_index * 2, + line.bytes.msb); + 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 */ + lp3952_register_write(priv->client, LP3952_REG_PAT_GEN_CTRL, 0x06); + /* Update Bit 6 (Active mode),1 and 0 for pattern Gen */ + ret = regmap_update_bits(priv->regmap, LP3952_REG_ENABLES, 0x43, 0xfc); + 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, +}; + +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; + struct lp3952_platform_data *pdata = dev_get_platdata(&client->dev); + + dev_info(&client->dev, "lp3952 probe\n"); + + if (!pdata) { + dev_err(&client->dev, + "lp3952: failed to obtain platform_data\n"); + return -EINVAL; + } + priv = kzalloc(sizeof(struct lp3952_led_array), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->ndev = 6; + + leds = kcalloc(priv->ndev, sizeof(*leds), GFP_KERNEL); + if (!leds) { + kfree(priv); + return -ENOMEM; + } + priv->leds = leds; + priv->client = client; + priv->enable_gpio = pdata->enable_gpio; + 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; + } + status = gpio_request(priv->enable_gpio, "lp3952_gpio"); + if (status) + dev_warn(&client->dev, "Unable to disable reset gpio: %d\n", + status); + status = gpio_direction_output(priv->enable_gpio, 1); + if (status) + dev_warn(&client->dev, "Unable to disable reset gpio: %d\n", + status); + i2c_set_clientdata(client, priv); + + status = lp3952_configure(priv); + if (status) { + dev_err(&client->dev, "Probe failed. Device not found (%d)\n", + status); + kfree(leds); + kfree(priv); + return status; + } + lp3952_register_led_classdev(priv); + + lp3952_on_off(priv, LP3952_LED_ALL, 1); + 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); + + lp3952_unregister_led_classdev(priv); + + kfree(priv->leds); + gpio_direction_input(priv->enable_gpio); + gpio_free(priv->enable_gpio); + kfree(priv); + return 0; +} + +#ifdef CONFIG_PM +static int lp3952_suspend(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct lp3952_led_array *priv = i2c_get_clientdata(client); + + lp3952_on_off(priv, LP3952_LED_ALL, 0); + gpio_direction_input(priv->enable_gpio); + return 0; +} + +static int lp3952_resume(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct lp3952_led_array *priv = i2c_get_clientdata(client); + + gpio_direction_output(priv->enable_gpio, 1); + return 0; +} + +static SIMPLE_DEV_PM_OPS(lp3952_pm, lp3952_suspend, lp3952_resume); +#define LP3952_PM (&lp3952_pm) +#else /* CONFIG_PM */ +#define LP3952_PM NULL +#endif + +#ifdef CONFIG_ACPI +static const struct acpi_device_id lp3952_acpi_match[] = { + {LP3952_NAME, 0}, + {} +}; + +MODULE_DEVICE_TABLE(acpi, lp3952_acpi_match); +#endif + +static const struct i2c_device_id lp3952_id[] = { + {LP3952_NAME, 0}, + {} +}; + +static struct i2c_driver lp3952_i2c_driver = { + .driver = { + .name = LP3952_NAME, + .owner = THIS_MODULE, + .pm = LP3952_PM, +#ifdef CONFIG_ACPI + .acpi_match_table = ACPI_PTR(lp3952_acpi_match), +#endif + }, + .probe = lp3952_probe, + .remove = __exit_p(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..1b1e7c3 --- /dev/null +++ b/include/linux/leds-lp3952.h @@ -0,0 +1,89 @@ +/* + * Copyright (C) 2016, DAQRI LLC + * + * License Terms: GPL v2 + * + * TI lp3952 Controller driver + * + * Author: Tony Makkiel <tony.makkiel@xxxxxxxxx> + * + */ + +#ifndef LEDS_LP3952_H_ +#define LEDS_LP3952_H_ + +#define LP3952_NAME "lp3952" +#define LP3952_DEV_ADDR 0x54 +/* Following 2 MACRO are specific to Minnowboard Max + * Use the appropriate host specific values when + * instantiating device + */ +#define LP3952_BUS_ADDR 7 +#define LP3952_NRST_GPIO 464 + +/* 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_brightness { + LP3952_OFF = 0, + LP3952_QUARTER_BRIGHT, + LP3952_HALF_BRIGHT, + LP3952_THREE_QRTR_BRIGHT, + LP3952_FULL_BRIGHT +}; + +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_platform_data { + u32 enable_gpio; +}; + +#endif /* LEDS_LP3952_H_ */ -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-leds" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
