From: Dan Murphy <dmurphy-l0cyMroinI0@public.gmane.org> To: robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, mark.rutland-5wv7dgnIgG8@public.gmane.org, rpurdie-Fm38FmjxZ/leoWH0uzbU5w@public.gmane.org, jacek.anaszewski-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, pavel-+ZI9xUNit7I@public.gmane.org Cc: devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-leds-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Dan Murphy <dmurphy-l0cyMroinI0@public.gmane.org> Subject: [PATCH v3 2/2] leds: lm3692x: Introduce LM3692x dual string driver Date: Wed, 15 Nov 2017 13:42:03 -0600 [thread overview] Message-ID: <20171115194203.13572-2-dmurphy@ti.com> (raw) In-Reply-To: <20171115194203.13572-1-dmurphy-l0cyMroinI0@public.gmane.org> Introducing the LM3692x Dual-String white LED driver. Data sheet is located http://www.ti.com/lit/ds/snvsa29/snvsa29.pdf Signed-off-by: Dan Murphy <dmurphy-l0cyMroinI0@public.gmane.org> --- v3 - Add missing Makefile and Kconfig from v1 and v2 - https://patchwork.kernel.org/patch/10060075/ v2 - Added data sheet link, fixed linuxdoc format, returned on failure in init routine, return on fault_check failure, updated brightness calculation and fixed capitalization issue - https://patchwork.kernel.org/patch/10056675/ drivers/leds/Kconfig | 7 + drivers/leds/Makefile | 1 + drivers/leds/leds-lm3692x.c | 390 ++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 398 insertions(+) create mode 100644 drivers/leds/leds-lm3692x.c diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index 318a28fd58fe..1363e77a7d5f 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -137,6 +137,13 @@ config LEDS_LM3642 converter plus 1.5A constant current driver for a high-current white LED. +config LEDS_LM3692X + tristate "LED support for LM3692x Chips" + depends on LEDS_CLASS && I2C + select REGMAP_I2C + help + This option enables support for the TI LM3692x family + of LED drivers. config LEDS_LOCOMO tristate "LED Support for Locomo device" diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile index a2a6b5a4f86d..987884a5b9a5 100644 --- a/drivers/leds/Makefile +++ b/drivers/leds/Makefile @@ -74,6 +74,7 @@ obj-$(CONFIG_LEDS_PM8058) += leds-pm8058.o obj-$(CONFIG_LEDS_MLXCPLD) += leds-mlxcpld.o obj-$(CONFIG_LEDS_NIC78BX) += leds-nic78bx.o obj-$(CONFIG_LEDS_MT6323) += leds-mt6323.o +obj-$(CONFIG_LEDS_LM3692X) += leds-lm3692x.o # LED SPI Drivers obj-$(CONFIG_LEDS_DAC124S085) += leds-dac124s085.o diff --git a/drivers/leds/leds-lm3692x.c b/drivers/leds/leds-lm3692x.c new file mode 100644 index 000000000000..9fa7f5a20466 --- /dev/null +++ b/drivers/leds/leds-lm3692x.c @@ -0,0 +1,390 @@ +/* + * TI lm3692x LED Driver + * + * Copyright (C) 2017 Texas Instruments + * + * Author: Dan Murphy <dmurphy-l0cyMroinI0@public.gmane.org> + * + * 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. + * + * Data sheet is located + * http://www.ti.com/lit/ds/snvsa29/snvsa29.pdf + */ + +#include <linux/i2c.h> +#include <linux/init.h> +#include <linux/leds.h> +#include <linux/regmap.h> +#include <linux/regulator/consumer.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/of.h> +#include <linux/of_gpio.h> +#include <linux/gpio/consumer.h> +#include <linux/slab.h> + +#define LM3692X_LED_NAME "lm3692x_led" + +#define LM3692X_REV 0x0 +#define LM3692X_RESET 0x1 +#define LM3692X_EN 0x10 +#define LM3692X_BRT_CTRL 0x11 +#define LM3692X_PWM_CTRL 0x12 +#define LM3692X_BOOST_CTRL 0x13 +#define LM3692X_AUTO_FREQ_HI 0x15 +#define LM3692X_AUTO_FREQ_LO 0x16 +#define LM3692X_BL_ADJ_THRESH 0x17 +#define LM3692X_BRT_LSB 0x18 +#define LM3692X_BRT_MSB 0x19 +#define LM3692X_FAULT_CTRL 0x1e +#define LM3692X_FAULT_FLAGS 0x1f + +#define LM3692X_SW_RESET BIT(0) +#define LM3692X_DEVICE_EN BIT(0) +#define LM3692X_LED1_EN BIT(1) +#define LM3692X_LED2_EN BIT(2) + +/* Brightness Control Bits */ +#define LM3692X_BL_ADJ_POL BIT(0) +#define LM3692X_RAMP_RATE_125us 0x00 +#define LM3692X_RAMP_RATE_250us BIT(1) +#define LM3692X_RAMP_RATE_500us BIT(2) +#define LM3692X_RAMP_RATE_1ms (BIT(1) | BIT(2)) +#define LM3692X_RAMP_RATE_2ms BIT(3) +#define LM3692X_RAMP_RATE_4ms (BIT(3) | BIT(1)) +#define LM3692X_RAMP_RATE_8ms (BIT(2) | BIT(3)) +#define LM3692X_RAMP_RATE_16ms (BIT(1) | BIT(2) | BIT(3)) +#define LM3692X_RAMP_EN BIT(4) +#define LM3692X_BRHT_MODE_REG 0x00 +#define LM3692X_BRHT_MODE_PWM BIT(5) +#define LM3692X_BRHT_MODE_MULTI_RAMP BIT(6) +#define LM3692X_BRHT_MODE_RAMP_MULTI (BIT(5) | BIT(6)) +#define LM3692X_MAP_MODE_EXP BIT(7) + +/* PWM Register Bits */ +#define LM3692X_PWM_FILTER_100 BIT(0) +#define LM3692X_PWM_FILTER_150 BIT(1) +#define LM3692X_PWM_FILTER_200 (BIT(0) | BIT(1)) +#define LM3692X_PWM_HYSTER_1LSB BIT(2) +#define LM3692X_PWM_HYSTER_2LSB BIT(3) +#define LM3692X_PWM_HYSTER_3LSB (BIT(3) | BIT(2)) +#define LM3692X_PWM_HYSTER_4LSB BIT(4) +#define LM3692X_PWM_HYSTER_5LSB (BIT(4) | BIT(2)) +#define LM3692X_PWM_HYSTER_6LSB (BIT(4) | BIT(3)) +#define LM3692X_PWM_POLARITY BIT(5) +#define LM3692X_PWM_SAMP_4MHZ BIT(6) +#define LM3692X_PWM_SAMP_24MHZ BIT(7) + +/* Boost Control Bits */ +#define LM3692X_OCP_PROT_1A BIT(0) +#define LM3692X_OCP_PROT_1_25A BIT(1) +#define LM3692X_OCP_PROT_1_5A (BIT(0) | BIT(1)) +#define LM3692X_OVP_21V BIT(2) +#define LM3692X_OVP_25V BIT(3) +#define LM3692X_OVP_29V (BIT(2) | BIT(3)) +#define LM3692X_MIN_IND_22UH BIT(4) +#define LM3692X_BOOST_SW_1MHZ BIT(5) +#define LM3692X_BOOST_SW_NO_SHIFT BIT(6) + +/* Fault Control Bits */ +#define LM3692X_FAULT_CTRL_OVP BIT(0) +#define LM3692X_FAULT_CTRL_OCP BIT(1) +#define LM3692X_FAULT_CTRL_TSD BIT(2) +#define LM3692X_FAULT_CTRL_OPEN BIT(3) + +/* Fault Flag Bits */ +#define LM3692X_FAULT_FLAG_OVP BIT(0) +#define LM3692X_FAULT_FLAG_OCP BIT(1) +#define LM3692X_FAULT_FLAG_TSD BIT(2) +#define LM3692X_FAULT_FLAG_SHRT BIT(3) +#define LM3692X_FAULT_FLAG_OPEN BIT(4) + +/** + * struct lm3692x_led - + * @lock - Lock for reading/writing the device + * @client - Pointer to the I2C client + * @led_dev - led class device pointer + * @regmap - Devices register map + * @enable_gpio - VDDIO/EN gpio to enable communication interface + * @regulator - LED supply regulator pointer + * @label - LED label + */ +struct lm3692x_led { + struct mutex lock; + struct i2c_client *client; + struct led_classdev led_dev; + struct regmap *regmap; + struct gpio_desc *enable_gpio; + struct regulator *regulator; + const char *label; +}; + +static const struct reg_default lm3692x_reg_defs[] = { + {LM3692X_EN, 0xf}, + {LM3692X_BRT_CTRL, 0x61}, + {LM3692X_PWM_CTRL, 0x73}, + {LM3692X_BOOST_CTRL, 0x6f}, + {LM3692X_AUTO_FREQ_HI, 0x0}, + {LM3692X_AUTO_FREQ_LO, 0x0}, + {LM3692X_BL_ADJ_THRESH, 0x0}, + {LM3692X_BRT_LSB, 0x7}, + {LM3692X_BRT_MSB, 0xff}, + {LM3692X_FAULT_CTRL, 0x7}, +}; + +static const struct regmap_config lm3692x_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + + .max_register = LM3692X_FAULT_FLAGS, + .reg_defaults = lm3692x_reg_defs, + .num_reg_defaults = ARRAY_SIZE(lm3692x_reg_defs), + .cache_type = REGCACHE_RBTREE, +}; + +static int lm3692x_fault_check(struct lm3692x_led *led) +{ + int ret, fault; + unsigned int read_buf; + + ret = regmap_read(led->regmap, LM3692X_FAULT_FLAGS, &read_buf); + if (ret) + return ret; + + fault = read_buf; + + if (fault) + dev_err(&led->client->dev, "Detected a fault 0x%X\n", + fault); + + return ret; +} + +static int lm3692x_brightness_set(struct led_classdev *led_cdev, + enum led_brightness brt_val) +{ + struct lm3692x_led *led = + container_of(led_cdev, struct lm3692x_led, led_dev); + int ret; + int led_brightness_lsb = (brt_val >> 5); + + mutex_lock(&led->lock); + + ret = lm3692x_fault_check(led); + if (ret) { + dev_err(&led->client->dev, "Cannot read/clear faults\n"); + goto out; + } + + ret = regmap_write(led->regmap, LM3692X_BRT_MSB, brt_val); + if (ret) { + dev_err(&led->client->dev, "Cannot write MSB\n"); + goto out; + } + + ret = regmap_write(led->regmap, LM3692X_BRT_LSB, led_brightness_lsb); + if (ret) { + dev_err(&led->client->dev, "Cannot write LSB\n"); + goto out; + } +out: + mutex_unlock(&led->lock); + return ret; +} + +static int lm3692x_init(struct lm3692x_led *led) +{ + int ret; + + if (led->regulator) { + ret = regulator_enable(led->regulator); + if (ret) + dev_err(&led->client->dev, + "Failed to enable regulator\n"); + goto out; + } + + if (led->enable_gpio) + gpiod_direction_output(led->enable_gpio, 1); + + ret = lm3692x_fault_check(led); + if (ret) { + dev_err(&led->client->dev, "Cannot read/clear faults\n"); + goto out; + } + + ret = regmap_write(led->regmap, LM3692X_BRT_CTRL, 0x00); + if (ret) { + dev_err(&led->client->dev, "Fail writing BRT CTRL\n"); + goto out; + } + + /* + * For glitch free operation, the following data should + * only be written while device enable bit is 0 + * per Section 7.5.14 of the data sheet + */ + ret = regmap_write(led->regmap, LM3692X_PWM_CTRL, + LM3692X_PWM_FILTER_100 | LM3692X_PWM_SAMP_24MHZ); + if (ret) { + dev_err(&led->client->dev, "Failed programming PWM CTRL\n"); + goto out; + } + + ret = regmap_write(led->regmap, LM3692X_BOOST_CTRL, + LM3692X_BRHT_MODE_RAMP_MULTI | + LM3692X_BL_ADJ_POL | + LM3692X_RAMP_RATE_250us); + if (ret) { + dev_err(&led->client->dev, "Failed programming BOOST CTRL\n"); + goto out; + } + + ret = regmap_write(led->regmap, LM3692X_AUTO_FREQ_HI, 0x00); + if (ret) { + dev_err(&led->client->dev, "Failed programming AUTO HI FREQ\n"); + goto out; + } + + ret = regmap_write(led->regmap, LM3692X_AUTO_FREQ_LO, 0x00); + if (ret) { + dev_err(&led->client->dev, "Failed programming AUTO LO FREQ\n"); + goto out; + } + + ret = regmap_write(led->regmap, LM3692X_BL_ADJ_THRESH, 0x00); + if (ret) { + dev_err(&led->client->dev, "Failed programming BL Threshold\n"); + goto out; + } + + ret = regmap_write(led->regmap, LM3692X_BRT_CTRL, + LM3692X_BL_ADJ_POL | LM3692X_PWM_HYSTER_4LSB); + if (ret) + dev_err(&led->client->dev, "Failed programming BRT CTRL\n"); + + return ret; +out: + + if (led->enable_gpio) + gpiod_direction_output(led->enable_gpio, 0); + + if (led->regulator) { + ret = regulator_disable(led->regulator); + if (ret) + dev_err(&led->client->dev, + "Failed to disable regulator\n"); + } + + return ret; +} + +static int lm3692x_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + int ret; + struct lm3692x_led *led; + struct device_node *np = client->dev.of_node; + + led = devm_kzalloc(&client->dev, sizeof(*led), GFP_KERNEL); + if (!led) + return -ENOMEM; + + if (client->dev.of_node) { + ret = of_property_read_string(np, "label", &led->label); + if (ret) + led->label = LM3692X_LED_NAME; + } + + led->enable_gpio = devm_gpiod_get_optional(&client->dev, + "enable", GPIOD_OUT_LOW); + if (IS_ERR(led->enable_gpio)) { + ret = PTR_ERR(led->enable_gpio); + dev_err(&client->dev, "Failed to get enable gpio: %d\n", ret); + return ret; + } + + led->regulator = devm_regulator_get(&client->dev, "vled"); + if (IS_ERR(led->regulator)) + led->regulator = NULL; + + led->client = client; + led->led_dev.name = led->label; + led->led_dev.max_brightness = LED_FULL; + led->led_dev.brightness_set_blocking = lm3692x_brightness_set; + + mutex_init(&led->lock); + + i2c_set_clientdata(client, led); + + led->regmap = devm_regmap_init_i2c(client, &lm3692x_regmap_config); + if (IS_ERR(led->regmap)) { + ret = PTR_ERR(led->regmap); + dev_err(&client->dev, "Failed to allocate register map: %d\n", + ret); + return ret; + } + + ret = lm3692x_init(led); + if (ret) + return ret; + + ret = led_classdev_register(&client->dev, &led->led_dev); + if (ret) { + dev_err(&client->dev, "led register err: %d\n", ret); + return ret; + } + + return 0; +} + +static int lm3692x_remove(struct i2c_client *client) +{ + struct lm3692x_led *led = i2c_get_clientdata(client); + int ret; + + led_classdev_unregister(&led->led_dev); + + if (led->enable_gpio) + gpiod_direction_output(led->enable_gpio, 0); + + if (led->regulator) { + ret = regulator_disable(led->regulator); + if (ret) + dev_err(&led->client->dev, + "Failed to disable regulator\n"); + } + + return 0; +} + +static const struct i2c_device_id lm3692x_id[] = { + { "lm3692x", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, lm3692x_id); + +#ifdef CONFIG_OF +static const struct of_device_id of_lm3692x_leds_match[] = { + { .compatible = "ti,lm3692x", }, + {}, +}; +MODULE_DEVICE_TABLE(of, of_lm3692x_leds_match); +#endif + +static struct i2c_driver lm3692x_driver = { + .driver = { + .name = "lm3692x", + .of_match_table = of_match_ptr(of_lm3692x_leds_match), + }, + .probe = lm3692x_probe, + .remove = lm3692x_remove, + .id_table = lm3692x_id, +}; +module_i2c_driver(lm3692x_driver); + +MODULE_DESCRIPTION("Texas Instruments LM3692X LED driver"); +MODULE_AUTHOR("Dan Murphy <dmurphy-l0cyMroinI0@public.gmane.org>"); +MODULE_LICENSE("GPL"); -- 2.15.0.124.g7668cbc60 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html
WARNING: multiple messages have this Message-ID (diff)
From: Dan Murphy <dmurphy@ti.com> To: <robh+dt@kernel.org>, <mark.rutland@arm.com>, <rpurdie@rpsys.net>, <jacek.anaszewski@gmail.com>, <pavel@ucw.cz> Cc: <devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>, <linux-leds@vger.kernel.org>, Dan Murphy <dmurphy@ti.com> Subject: [PATCH v3 2/2] leds: lm3692x: Introduce LM3692x dual string driver Date: Wed, 15 Nov 2017 13:42:03 -0600 [thread overview] Message-ID: <20171115194203.13572-2-dmurphy@ti.com> (raw) In-Reply-To: <20171115194203.13572-1-dmurphy@ti.com> Introducing the LM3692x Dual-String white LED driver. Data sheet is located http://www.ti.com/lit/ds/snvsa29/snvsa29.pdf Signed-off-by: Dan Murphy <dmurphy@ti.com> --- v3 - Add missing Makefile and Kconfig from v1 and v2 - https://patchwork.kernel.org/patch/10060075/ v2 - Added data sheet link, fixed linuxdoc format, returned on failure in init routine, return on fault_check failure, updated brightness calculation and fixed capitalization issue - https://patchwork.kernel.org/patch/10056675/ drivers/leds/Kconfig | 7 + drivers/leds/Makefile | 1 + drivers/leds/leds-lm3692x.c | 390 ++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 398 insertions(+) create mode 100644 drivers/leds/leds-lm3692x.c diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index 318a28fd58fe..1363e77a7d5f 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -137,6 +137,13 @@ config LEDS_LM3642 converter plus 1.5A constant current driver for a high-current white LED. +config LEDS_LM3692X + tristate "LED support for LM3692x Chips" + depends on LEDS_CLASS && I2C + select REGMAP_I2C + help + This option enables support for the TI LM3692x family + of LED drivers. config LEDS_LOCOMO tristate "LED Support for Locomo device" diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile index a2a6b5a4f86d..987884a5b9a5 100644 --- a/drivers/leds/Makefile +++ b/drivers/leds/Makefile @@ -74,6 +74,7 @@ obj-$(CONFIG_LEDS_PM8058) += leds-pm8058.o obj-$(CONFIG_LEDS_MLXCPLD) += leds-mlxcpld.o obj-$(CONFIG_LEDS_NIC78BX) += leds-nic78bx.o obj-$(CONFIG_LEDS_MT6323) += leds-mt6323.o +obj-$(CONFIG_LEDS_LM3692X) += leds-lm3692x.o # LED SPI Drivers obj-$(CONFIG_LEDS_DAC124S085) += leds-dac124s085.o diff --git a/drivers/leds/leds-lm3692x.c b/drivers/leds/leds-lm3692x.c new file mode 100644 index 000000000000..9fa7f5a20466 --- /dev/null +++ b/drivers/leds/leds-lm3692x.c @@ -0,0 +1,390 @@ +/* + * TI lm3692x LED Driver + * + * Copyright (C) 2017 Texas Instruments + * + * Author: Dan Murphy <dmurphy@ti.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. + * + * Data sheet is located + * http://www.ti.com/lit/ds/snvsa29/snvsa29.pdf + */ + +#include <linux/i2c.h> +#include <linux/init.h> +#include <linux/leds.h> +#include <linux/regmap.h> +#include <linux/regulator/consumer.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/of.h> +#include <linux/of_gpio.h> +#include <linux/gpio/consumer.h> +#include <linux/slab.h> + +#define LM3692X_LED_NAME "lm3692x_led" + +#define LM3692X_REV 0x0 +#define LM3692X_RESET 0x1 +#define LM3692X_EN 0x10 +#define LM3692X_BRT_CTRL 0x11 +#define LM3692X_PWM_CTRL 0x12 +#define LM3692X_BOOST_CTRL 0x13 +#define LM3692X_AUTO_FREQ_HI 0x15 +#define LM3692X_AUTO_FREQ_LO 0x16 +#define LM3692X_BL_ADJ_THRESH 0x17 +#define LM3692X_BRT_LSB 0x18 +#define LM3692X_BRT_MSB 0x19 +#define LM3692X_FAULT_CTRL 0x1e +#define LM3692X_FAULT_FLAGS 0x1f + +#define LM3692X_SW_RESET BIT(0) +#define LM3692X_DEVICE_EN BIT(0) +#define LM3692X_LED1_EN BIT(1) +#define LM3692X_LED2_EN BIT(2) + +/* Brightness Control Bits */ +#define LM3692X_BL_ADJ_POL BIT(0) +#define LM3692X_RAMP_RATE_125us 0x00 +#define LM3692X_RAMP_RATE_250us BIT(1) +#define LM3692X_RAMP_RATE_500us BIT(2) +#define LM3692X_RAMP_RATE_1ms (BIT(1) | BIT(2)) +#define LM3692X_RAMP_RATE_2ms BIT(3) +#define LM3692X_RAMP_RATE_4ms (BIT(3) | BIT(1)) +#define LM3692X_RAMP_RATE_8ms (BIT(2) | BIT(3)) +#define LM3692X_RAMP_RATE_16ms (BIT(1) | BIT(2) | BIT(3)) +#define LM3692X_RAMP_EN BIT(4) +#define LM3692X_BRHT_MODE_REG 0x00 +#define LM3692X_BRHT_MODE_PWM BIT(5) +#define LM3692X_BRHT_MODE_MULTI_RAMP BIT(6) +#define LM3692X_BRHT_MODE_RAMP_MULTI (BIT(5) | BIT(6)) +#define LM3692X_MAP_MODE_EXP BIT(7) + +/* PWM Register Bits */ +#define LM3692X_PWM_FILTER_100 BIT(0) +#define LM3692X_PWM_FILTER_150 BIT(1) +#define LM3692X_PWM_FILTER_200 (BIT(0) | BIT(1)) +#define LM3692X_PWM_HYSTER_1LSB BIT(2) +#define LM3692X_PWM_HYSTER_2LSB BIT(3) +#define LM3692X_PWM_HYSTER_3LSB (BIT(3) | BIT(2)) +#define LM3692X_PWM_HYSTER_4LSB BIT(4) +#define LM3692X_PWM_HYSTER_5LSB (BIT(4) | BIT(2)) +#define LM3692X_PWM_HYSTER_6LSB (BIT(4) | BIT(3)) +#define LM3692X_PWM_POLARITY BIT(5) +#define LM3692X_PWM_SAMP_4MHZ BIT(6) +#define LM3692X_PWM_SAMP_24MHZ BIT(7) + +/* Boost Control Bits */ +#define LM3692X_OCP_PROT_1A BIT(0) +#define LM3692X_OCP_PROT_1_25A BIT(1) +#define LM3692X_OCP_PROT_1_5A (BIT(0) | BIT(1)) +#define LM3692X_OVP_21V BIT(2) +#define LM3692X_OVP_25V BIT(3) +#define LM3692X_OVP_29V (BIT(2) | BIT(3)) +#define LM3692X_MIN_IND_22UH BIT(4) +#define LM3692X_BOOST_SW_1MHZ BIT(5) +#define LM3692X_BOOST_SW_NO_SHIFT BIT(6) + +/* Fault Control Bits */ +#define LM3692X_FAULT_CTRL_OVP BIT(0) +#define LM3692X_FAULT_CTRL_OCP BIT(1) +#define LM3692X_FAULT_CTRL_TSD BIT(2) +#define LM3692X_FAULT_CTRL_OPEN BIT(3) + +/* Fault Flag Bits */ +#define LM3692X_FAULT_FLAG_OVP BIT(0) +#define LM3692X_FAULT_FLAG_OCP BIT(1) +#define LM3692X_FAULT_FLAG_TSD BIT(2) +#define LM3692X_FAULT_FLAG_SHRT BIT(3) +#define LM3692X_FAULT_FLAG_OPEN BIT(4) + +/** + * struct lm3692x_led - + * @lock - Lock for reading/writing the device + * @client - Pointer to the I2C client + * @led_dev - led class device pointer + * @regmap - Devices register map + * @enable_gpio - VDDIO/EN gpio to enable communication interface + * @regulator - LED supply regulator pointer + * @label - LED label + */ +struct lm3692x_led { + struct mutex lock; + struct i2c_client *client; + struct led_classdev led_dev; + struct regmap *regmap; + struct gpio_desc *enable_gpio; + struct regulator *regulator; + const char *label; +}; + +static const struct reg_default lm3692x_reg_defs[] = { + {LM3692X_EN, 0xf}, + {LM3692X_BRT_CTRL, 0x61}, + {LM3692X_PWM_CTRL, 0x73}, + {LM3692X_BOOST_CTRL, 0x6f}, + {LM3692X_AUTO_FREQ_HI, 0x0}, + {LM3692X_AUTO_FREQ_LO, 0x0}, + {LM3692X_BL_ADJ_THRESH, 0x0}, + {LM3692X_BRT_LSB, 0x7}, + {LM3692X_BRT_MSB, 0xff}, + {LM3692X_FAULT_CTRL, 0x7}, +}; + +static const struct regmap_config lm3692x_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + + .max_register = LM3692X_FAULT_FLAGS, + .reg_defaults = lm3692x_reg_defs, + .num_reg_defaults = ARRAY_SIZE(lm3692x_reg_defs), + .cache_type = REGCACHE_RBTREE, +}; + +static int lm3692x_fault_check(struct lm3692x_led *led) +{ + int ret, fault; + unsigned int read_buf; + + ret = regmap_read(led->regmap, LM3692X_FAULT_FLAGS, &read_buf); + if (ret) + return ret; + + fault = read_buf; + + if (fault) + dev_err(&led->client->dev, "Detected a fault 0x%X\n", + fault); + + return ret; +} + +static int lm3692x_brightness_set(struct led_classdev *led_cdev, + enum led_brightness brt_val) +{ + struct lm3692x_led *led = + container_of(led_cdev, struct lm3692x_led, led_dev); + int ret; + int led_brightness_lsb = (brt_val >> 5); + + mutex_lock(&led->lock); + + ret = lm3692x_fault_check(led); + if (ret) { + dev_err(&led->client->dev, "Cannot read/clear faults\n"); + goto out; + } + + ret = regmap_write(led->regmap, LM3692X_BRT_MSB, brt_val); + if (ret) { + dev_err(&led->client->dev, "Cannot write MSB\n"); + goto out; + } + + ret = regmap_write(led->regmap, LM3692X_BRT_LSB, led_brightness_lsb); + if (ret) { + dev_err(&led->client->dev, "Cannot write LSB\n"); + goto out; + } +out: + mutex_unlock(&led->lock); + return ret; +} + +static int lm3692x_init(struct lm3692x_led *led) +{ + int ret; + + if (led->regulator) { + ret = regulator_enable(led->regulator); + if (ret) + dev_err(&led->client->dev, + "Failed to enable regulator\n"); + goto out; + } + + if (led->enable_gpio) + gpiod_direction_output(led->enable_gpio, 1); + + ret = lm3692x_fault_check(led); + if (ret) { + dev_err(&led->client->dev, "Cannot read/clear faults\n"); + goto out; + } + + ret = regmap_write(led->regmap, LM3692X_BRT_CTRL, 0x00); + if (ret) { + dev_err(&led->client->dev, "Fail writing BRT CTRL\n"); + goto out; + } + + /* + * For glitch free operation, the following data should + * only be written while device enable bit is 0 + * per Section 7.5.14 of the data sheet + */ + ret = regmap_write(led->regmap, LM3692X_PWM_CTRL, + LM3692X_PWM_FILTER_100 | LM3692X_PWM_SAMP_24MHZ); + if (ret) { + dev_err(&led->client->dev, "Failed programming PWM CTRL\n"); + goto out; + } + + ret = regmap_write(led->regmap, LM3692X_BOOST_CTRL, + LM3692X_BRHT_MODE_RAMP_MULTI | + LM3692X_BL_ADJ_POL | + LM3692X_RAMP_RATE_250us); + if (ret) { + dev_err(&led->client->dev, "Failed programming BOOST CTRL\n"); + goto out; + } + + ret = regmap_write(led->regmap, LM3692X_AUTO_FREQ_HI, 0x00); + if (ret) { + dev_err(&led->client->dev, "Failed programming AUTO HI FREQ\n"); + goto out; + } + + ret = regmap_write(led->regmap, LM3692X_AUTO_FREQ_LO, 0x00); + if (ret) { + dev_err(&led->client->dev, "Failed programming AUTO LO FREQ\n"); + goto out; + } + + ret = regmap_write(led->regmap, LM3692X_BL_ADJ_THRESH, 0x00); + if (ret) { + dev_err(&led->client->dev, "Failed programming BL Threshold\n"); + goto out; + } + + ret = regmap_write(led->regmap, LM3692X_BRT_CTRL, + LM3692X_BL_ADJ_POL | LM3692X_PWM_HYSTER_4LSB); + if (ret) + dev_err(&led->client->dev, "Failed programming BRT CTRL\n"); + + return ret; +out: + + if (led->enable_gpio) + gpiod_direction_output(led->enable_gpio, 0); + + if (led->regulator) { + ret = regulator_disable(led->regulator); + if (ret) + dev_err(&led->client->dev, + "Failed to disable regulator\n"); + } + + return ret; +} + +static int lm3692x_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + int ret; + struct lm3692x_led *led; + struct device_node *np = client->dev.of_node; + + led = devm_kzalloc(&client->dev, sizeof(*led), GFP_KERNEL); + if (!led) + return -ENOMEM; + + if (client->dev.of_node) { + ret = of_property_read_string(np, "label", &led->label); + if (ret) + led->label = LM3692X_LED_NAME; + } + + led->enable_gpio = devm_gpiod_get_optional(&client->dev, + "enable", GPIOD_OUT_LOW); + if (IS_ERR(led->enable_gpio)) { + ret = PTR_ERR(led->enable_gpio); + dev_err(&client->dev, "Failed to get enable gpio: %d\n", ret); + return ret; + } + + led->regulator = devm_regulator_get(&client->dev, "vled"); + if (IS_ERR(led->regulator)) + led->regulator = NULL; + + led->client = client; + led->led_dev.name = led->label; + led->led_dev.max_brightness = LED_FULL; + led->led_dev.brightness_set_blocking = lm3692x_brightness_set; + + mutex_init(&led->lock); + + i2c_set_clientdata(client, led); + + led->regmap = devm_regmap_init_i2c(client, &lm3692x_regmap_config); + if (IS_ERR(led->regmap)) { + ret = PTR_ERR(led->regmap); + dev_err(&client->dev, "Failed to allocate register map: %d\n", + ret); + return ret; + } + + ret = lm3692x_init(led); + if (ret) + return ret; + + ret = led_classdev_register(&client->dev, &led->led_dev); + if (ret) { + dev_err(&client->dev, "led register err: %d\n", ret); + return ret; + } + + return 0; +} + +static int lm3692x_remove(struct i2c_client *client) +{ + struct lm3692x_led *led = i2c_get_clientdata(client); + int ret; + + led_classdev_unregister(&led->led_dev); + + if (led->enable_gpio) + gpiod_direction_output(led->enable_gpio, 0); + + if (led->regulator) { + ret = regulator_disable(led->regulator); + if (ret) + dev_err(&led->client->dev, + "Failed to disable regulator\n"); + } + + return 0; +} + +static const struct i2c_device_id lm3692x_id[] = { + { "lm3692x", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, lm3692x_id); + +#ifdef CONFIG_OF +static const struct of_device_id of_lm3692x_leds_match[] = { + { .compatible = "ti,lm3692x", }, + {}, +}; +MODULE_DEVICE_TABLE(of, of_lm3692x_leds_match); +#endif + +static struct i2c_driver lm3692x_driver = { + .driver = { + .name = "lm3692x", + .of_match_table = of_match_ptr(of_lm3692x_leds_match), + }, + .probe = lm3692x_probe, + .remove = lm3692x_remove, + .id_table = lm3692x_id, +}; +module_i2c_driver(lm3692x_driver); + +MODULE_DESCRIPTION("Texas Instruments LM3692X LED driver"); +MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>"); +MODULE_LICENSE("GPL"); -- 2.15.0.124.g7668cbc60
next prev parent reply other threads:[~2017-11-15 19:42 UTC|newest] Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-11-15 19:42 [PATCH v3 1/2] dt: bindings: lm3692x: Add bindings for lm3692x LED driver Dan Murphy 2017-11-15 19:42 ` Dan Murphy [not found] ` <20171115194203.13572-1-dmurphy-l0cyMroinI0@public.gmane.org> 2017-11-15 19:42 ` Dan Murphy [this message] 2017-11-15 19:42 ` [PATCH v3 2/2] leds: lm3692x: Introduce LM3692x dual string driver Dan Murphy [not found] ` <20171115194203.13572-2-dmurphy-l0cyMroinI0@public.gmane.org> 2017-11-15 21:12 ` Pavel Machek 2017-11-15 21:12 ` Pavel Machek 2017-11-15 21:25 ` Dan Murphy 2017-11-15 21:25 ` Dan Murphy 2017-11-18 14:19 ` Jacek Anaszewski 2017-11-18 14:19 ` Jacek Anaszewski 2017-11-28 12:53 ` Dan Murphy 2017-11-28 12:53 ` Dan Murphy 2017-11-15 20:15 ` [PATCH v3 1/2] dt: bindings: lm3692x: Add bindings for lm3692x LED driver Jacek Anaszewski 2017-11-15 20:15 ` Jacek Anaszewski [not found] ` <cb5c5a65-d5a0-86a3-36b4-cf06baae9ec4-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> 2017-11-15 20:31 ` Dan Murphy 2017-11-15 20:31 ` Dan Murphy [not found] ` <0a78c883-f074-cc19-3c0c-fc05607400e9-l0cyMroinI0@public.gmane.org> 2017-11-15 22:23 ` Pavel Machek 2017-11-15 22:23 ` Pavel Machek 2017-11-16 20:14 ` Jacek Anaszewski [not found] ` <82336eb7-2b89-d37b-d688-4e4302766346-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> 2017-11-16 21:42 ` Dan Murphy 2017-11-16 21:42 ` Dan Murphy 2017-11-17 2:19 ` Jingoo Han 2017-11-17 2:19 ` Jingoo Han 2017-11-17 11:20 ` Pavel Machek 2017-11-17 16:30 ` Jingoo Han 2017-11-17 16:30 ` Jingoo Han 2017-11-17 18:02 ` Dan Murphy 2017-11-17 18:02 ` Dan Murphy 2017-11-17 23:58 ` Pavel Machek 2017-11-28 17:27 ` Dan Murphy 2017-11-28 17:27 ` Dan Murphy 2017-11-16 15:41 ` Rob Herring 2017-11-16 15:41 ` Rob Herring 2017-11-16 15:45 ` Dan Murphy 2017-11-16 15:45 ` Dan Murphy [not found] ` <d3483e49-650d-1d68-bec6-eeb84d8ac48a-l0cyMroinI0@public.gmane.org> 2017-11-16 15:58 ` Rob Herring 2017-11-16 15:58 ` Rob Herring 2017-11-16 20:11 ` dts: fun with chip names " Pavel Machek 2017-11-16 20:36 ` Rob Herring [not found] ` <CAL_Jsq+aysVR9U2Wquwwv7cjjO7wO8EXBg1Ja82u6s5t1yeJUw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2017-11-16 21:40 ` Dan Murphy 2017-11-16 21:40 ` Dan Murphy 2017-11-18 14:19 ` Jacek Anaszewski
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