From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751121AbeEUVLB (ORCPT ); Mon, 21 May 2018 17:11:01 -0400 Received: from mail-wm0-f68.google.com ([74.125.82.68]:37501 "EHLO mail-wm0-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750837AbeEUVK5 (ORCPT ); Mon, 21 May 2018 17:10:57 -0400 X-Google-Smtp-Source: AB8JxZozLkTUEX/6kH8bJjl+gK3FCaW9bc8xO08+D8Hl+fg1ul7nWY0qxNo9AZNES4xbGps2ChFFOQ== Subject: Re: [PATCH v7 2/2] leds: lm3601x: Introduce the lm3601x LED driver To: Dan Murphy , robh+dt@kernel.org, mark.rutland@arm.com, andy.shevchenko@gmail.com Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-leds@vger.kernel.org References: <20180521180927.18472-1-dmurphy@ti.com> <20180521180927.18472-2-dmurphy@ti.com> From: Jacek Anaszewski Message-ID: <69a920da-f759-de50-865c-0ebc43044b66@gmail.com> Date: Mon, 21 May 2018 23:09:33 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 MIME-Version: 1.0 In-Reply-To: <20180521180927.18472-2-dmurphy@ti.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Dan, Thank you for the update. On 05/21/2018 08:09 PM, Dan Murphy wrote: > Introduce the family of LED devices that can > drive a torch, strobe or IR LED. > > The LED driver can be configured with a strobe > timer to execute a strobe flash. The IR LED > brightness is controlled via the torch brightness > register. > > The data sheet for each the LM36010 and LM36011 > LED drivers can be found here: > http://www.ti.com/product/LM36010 > http://www.ti.com/product/LM36011 > > Signed-off-by: Dan Murphy > --- > > v7 - Numerous fixes to many to list. Highlights are moved from OF APIs to device_property > APIs, updated LED registration, timeout to reg algorithim, and fixed label generation - > https://patchwork.kernel.org/patch/10401437/ > > v6 - This driver has been heavily modified from v5. There is no longer reading > of individual child nodes. There are too many changes to list here see - > https://patchwork.kernel.org/patch/10392123/ > v5 - Fixed magic numbers, change reg cache type, added of_put_node to release > the dt node ref, and I did not change the remove function to leave the LED in its > state on driver removal - https://patchwork.kernel.org/patch/10391741/ > v4 - Fixed Cocci issue using ARRAY_SIZE - https://patchwork.kernel.org/patch/10389259/ > v3 - removed wildcard dt compatible, fixed copyright, fixed struct doc, removed > RO registers from default, added regmap volatile for FLAGS_REG, updated regmap cache type, > fixed unlock and extra semi colon in strobe_set, removed unnecessary out label > in led register and fixed checking of the ret in brightness_set - https://patchwork.kernel.org/patch/10386243/ > v2 - Fixed kbuild issue and removed unused cdev_strobe - https://patchwork.kernel.org/patch/10384585/ > > drivers/leds/Kconfig | 9 + > drivers/leds/Makefile | 1 + > drivers/leds/leds-lm3601x.c | 501 ++++++++++++++++++++++++++++++++++++ > 3 files changed, 511 insertions(+) > create mode 100644 drivers/leds/leds-lm3601x.c > > diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig > index 2c896c0e69e1..50ae536f343f 100644 > --- a/drivers/leds/Kconfig > +++ b/drivers/leds/Kconfig > @@ -145,6 +145,15 @@ config LEDS_LM3692X > This option enables support for the TI LM3692x family > of white LED string drivers used for backlighting. > > +config LEDS_LM3601X > + tristate "LED support for LM3601x Chips" > + depends on LEDS_CLASS && I2C && OF > + depends on LEDS_CLASS_FLASH > + select REGMAP_I2C > + help > + This option enables support for the TI LM3601x family > + of flash, torch and indicator classes. > + > config LEDS_LOCOMO > tristate "LED Support for Locomo device" > depends on LEDS_CLASS > diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile > index 91eca81cae82..b79807fe1b67 100644 > --- a/drivers/leds/Makefile > +++ b/drivers/leds/Makefile > @@ -76,6 +76,7 @@ obj-$(CONFIG_LEDS_MLXREG) += leds-mlxreg.o > obj-$(CONFIG_LEDS_NIC78BX) += leds-nic78bx.o > obj-$(CONFIG_LEDS_MT6323) += leds-mt6323.o > obj-$(CONFIG_LEDS_LM3692X) += leds-lm3692x.o > +obj-$(CONFIG_LEDS_LM3601X) += leds-lm3601x.o > > # LED SPI Drivers > obj-$(CONFIG_LEDS_DAC124S085) += leds-dac124s085.o > diff --git a/drivers/leds/leds-lm3601x.c b/drivers/leds/leds-lm3601x.c > new file mode 100644 > index 000000000000..7c71cb11d474 > --- /dev/null > +++ b/drivers/leds/leds-lm3601x.c > @@ -0,0 +1,501 @@ > +// SPDX-License-Identifier: GPL-2.0 > +// Flash and torch driver for Texas Instruments LM3601X LED > +// Flash driver chip family > +// Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/ > + > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > + > +#define LM3601X_LED_IR 0x0 > +#define LM3601X_LED_TORCH 0x1 > + > +/* Registers */ > +#define LM3601X_ENABLE_REG 0x01 > +#define LM3601X_CFG_REG 0x02 > +#define LM3601X_LED_FLASH_REG 0x03 > +#define LM3601X_LED_TORCH_REG 0x04 > +#define LM3601X_FLAGS_REG 0x05 > +#define LM3601X_DEV_ID_REG 0x06 > + > +#define LM3601X_SW_RESET BIT(7) > + > +/* Enable Mode bits */ > +#define LM3601X_MODE_STANDBY 0x00 > +#define LM3601X_MODE_IR_DRV BIT(0) > +#define LM3601X_MODE_TORCH BIT(1) > +#define LM3601X_MODE_STROBE (BIT(0) | BIT(1)) > +#define LM3601X_STRB_EN BIT(2) > +#define LM3601X_STRB_EDGE_TRIG BIT(3) > +#define LM3601X_IVFM_EN BIT(4) > + > +#define LM36010_BOOST_LIMIT_28 BIT(5) > +#define LM36010_BOOST_FREQ_4MHZ BIT(6) > +#define LM36010_BOOST_MODE_PASS BIT(7) > + > +/* Flag Mask */ > +#define LM3601X_FLASH_TIME_OUT BIT(0) > +#define LM3601X_UVLO_FAULT BIT(1) > +#define LM3601X_THERM_SHUTDOWN BIT(2) > +#define LM3601X_THERM_CURR BIT(3) > +#define LM36010_CURR_LIMIT BIT(4) > +#define LM3601X_SHORT_FAULT BIT(5) > +#define LM3601X_IVFM_TRIP BIT(6) > +#define LM36010_OVP_FAULT BIT(7) > + > +#define LM3601X_MAX_TORCH_I_UA 376000 > +#define LM3601X_MIN_TORCH_I_UA 2400 > +#define LM3601X_TORCH_REG_DIV 3000 > + > +#define LM3601X_MAX_STROBE_I_UA 1500000 > +#define LM3601X_MIN_STROBE_I_UA 11000 > +#define LM3601X_STROBE_REG_DIV 11800 > + > +#define LM3601X_TIMEOUT_MASK 0x1e > +#define LM3601X_ENABLE_MASK 0x03 > + > +#define LM3601X_LOWER_STEP_US 40000 > +#define LM3601X_UPPER_STEP_US 200000 > +#define LM3601X_MIN_TIMEOUT_US 40000 > +#define LM3601X_MAX_TIMEOUT_US 1600000 > +#define LM3601X_TIMEOUT_XOVER 400000 > + > +enum lm3601x_type { > + CHIP_LM36010 = 0, > + CHIP_LM36011, > +}; > + > +/** > + * struct lm3601x_led - > + * @fled_cdev: flash led class device pointer s/led/LED/ > + * @client: Pointer to the I2C client > + * @regmap: Devices register map > + * @lock: Lock for reading/writing the device > + * @led_name: LED label for the Torch or IR LED > + * @strobe_timeout: the timeout for the strobe > + * @last_flag: last known flags register value > + * @torch_current_max: maximum current for the torch > + * @strobe_current_max: maximum current for the strobe > + * @max_strobe_timeout: maximum timeout for the strobe > + * @led_mode: The mode to enable either IR or Torch > + */ > +struct lm3601x_led { > + struct led_classdev_flash fled_cdev; > + struct i2c_client *client; > + struct regmap *regmap; > + struct mutex lock; > + > + char led_name[LED_MAX_NAME_SIZE]; > + > + unsigned int strobe_timeout; > + unsigned int last_flag; > + > + u32 torch_current_max; > + u32 strobe_current_max; > + u32 max_strobe_timeout; > + > + u32 led_mode; > +}; > + > +static const struct reg_default lm3601x_regmap_defs[] = { > + { LM3601X_ENABLE_REG, 0x20 }, > + { LM3601X_CFG_REG, 0x15 }, > + { LM3601X_LED_FLASH_REG, 0x00 }, > + { LM3601X_LED_TORCH_REG, 0x00 }, > +}; > + > +static bool lm3601x_volatile_reg(struct device *dev, unsigned int reg) > +{ > + switch (reg) { > + case LM3601X_FLAGS_REG: > + return true; > + default: > + return false; > + } > +} > + > +static const struct regmap_config lm3601x_regmap = { > + .reg_bits = 8, > + .val_bits = 8, > + > + .max_register = LM3601X_DEV_ID_REG, > + .reg_defaults = lm3601x_regmap_defs, > + .num_reg_defaults = ARRAY_SIZE(lm3601x_regmap_defs), > + .cache_type = REGCACHE_RBTREE, > + .volatile_reg = lm3601x_volatile_reg, > +}; > + > +static struct lm3601x_led *fled_cdev_to_led( > + struct led_classdev_flash *fled_cdev) > +{ > + return container_of(fled_cdev, struct lm3601x_led, fled_cdev); > +} > + > +static int lm3601x_read_faults(struct lm3601x_led *led) > +{ > + int flags_val; > + int ret; > + > + ret = regmap_read(led->regmap, LM3601X_FLAGS_REG, &flags_val); > + if (ret < 0) > + return -EIO; > + > + led->last_flag = 0; > + > + if (flags_val & LM36010_OVP_FAULT) > + led->last_flag |= LED_FAULT_OVER_VOLTAGE; > + > + if (flags_val & (LM3601X_THERM_SHUTDOWN | LM3601X_THERM_CURR)) > + led->last_flag |= LED_FAULT_OVER_TEMPERATURE; > + > + if (flags_val & LM3601X_SHORT_FAULT) > + led->last_flag |= LED_FAULT_SHORT_CIRCUIT; > + > + if (flags_val & LM36010_CURR_LIMIT) > + led->last_flag |= LED_FAULT_OVER_CURRENT; > + > + if (flags_val & LM3601X_UVLO_FAULT) > + led->last_flag |= LED_FAULT_UNDER_VOLTAGE; > + > + if (flags_val & LM3601X_IVFM_TRIP) > + led->last_flag |= LED_FAULT_INPUT_VOLTAGE; > + > + if (flags_val & LM3601X_THERM_SHUTDOWN) > + led->last_flag |= LED_FAULT_LED_OVER_TEMPERATURE; > + > + return led->last_flag; > +} > + > +static int lm3601x_brightness_set(struct led_classdev *cdev, > + enum led_brightness brightness) > +{ > + struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(cdev); > + struct lm3601x_led *led = fled_cdev_to_led(fled_cdev); > + int ret, led_mode_val; > + u8 brightness_val; > + > + mutex_lock(&led->lock); > + > + ret = lm3601x_read_faults(led); > + if (ret < 0) > + goto out; > + > + if (led->led_mode == LM3601X_LED_TORCH) > + led_mode_val = LM3601X_MODE_TORCH; > + else > + led_mode_val = LM3601X_MODE_IR_DRV; > + > + if (brightness == LED_OFF) { > + ret = regmap_update_bits(led->regmap, LM3601X_ENABLE_REG, > + led_mode_val, LED_OFF); > + goto out; > + } > + > + if (brightness == LED_ON) > + brightness_val = LED_ON; Use of LED_ON enum can be a bit misleading here, It was designed for LEDs that can be only turned on/off. You can use DIV_ROUND_UP to achieve the same in a more clear way. > + else > + brightness_val = brightness / LM3601X_TORCH_REG_DIV; > + > + ret = regmap_write(led->regmap, LM3601X_LED_TORCH_REG, brightness_val); > + if (ret < 0) > + goto out; > + > + ret = regmap_update_bits(led->regmap, LM3601X_ENABLE_REG, > + LM3601X_MODE_TORCH | LM3601X_MODE_IR_DRV, > + led_mode_val); > +out: > + mutex_unlock(&led->lock); > + return ret; > +} > + > +static int lm3601x_strobe_set(struct led_classdev_flash *fled_cdev, > + bool state) > +{ > + struct lm3601x_led *led = fled_cdev_to_led(fled_cdev); > + int timeout_reg_val = 0; > + int current_timeout; > + int ret; > + > + mutex_lock(&led->lock); > + > + ret = regmap_read(led->regmap, LM3601X_CFG_REG, ¤t_timeout); > + if (ret < 0) > + goto out; > + > + if (led->strobe_timeout >= LM3601X_TIMEOUT_XOVER) > + timeout_reg_val = led->strobe_timeout / LM3601X_UPPER_STEP_US + 0x07; > + else > + timeout_reg_val = led->strobe_timeout / LM3601X_LOWER_STEP_US - 0x01; > + > + if (led->strobe_timeout != current_timeout) > + ret = regmap_update_bits(led->regmap, LM3601X_CFG_REG, > + LM3601X_TIMEOUT_MASK, timeout_reg_val); > + > + if (state) > + ret = regmap_update_bits(led->regmap, LM3601X_ENABLE_REG, > + LM3601X_MODE_TORCH | LM3601X_MODE_IR_DRV, > + LM3601X_MODE_STROBE); > + else > + ret = regmap_update_bits(led->regmap, LM3601X_ENABLE_REG, > + LM3601X_MODE_STROBE, LED_OFF); > + > + ret = lm3601x_read_faults(led); > +out: > + mutex_unlock(&led->lock); > + return ret; > +} > + > +static int lm3601x_strobe_brightness_set(struct led_classdev_flash *fled_cdev, > + u32 brightness) > +{ > + struct lm3601x_led *led = fled_cdev_to_led(fled_cdev); > + int ret; > + u8 brightness_val; > + > + mutex_lock(&led->lock); > + ret = lm3601x_read_faults(led); > + if (ret < 0) > + goto out; > + > + if (brightness == LED_OFF) { > + ret = regmap_update_bits(led->regmap, LM3601X_ENABLE_REG, > + LM3601X_MODE_STROBE, LED_OFF); > + goto out; > + } > + > + if (brightness == LED_ON) > + brightness_val = LED_ON; Ditto. > + else > + brightness_val = brightness / LM3601X_STROBE_REG_DIV; > + > + ret = regmap_write(led->regmap, LM3601X_LED_FLASH_REG, brightness_val); > +out: > + mutex_unlock(&led->lock); > + return ret; > +} > + > +static int lm3601x_strobe_timeout_set(struct led_classdev_flash *fled_cdev, > + u32 timeout) > +{ > + struct lm3601x_led *led = fled_cdev_to_led(fled_cdev); > + int ret = 0; > + > + mutex_lock(&led->lock); > + > + led->strobe_timeout = timeout; > + > + mutex_unlock(&led->lock); > + > + return ret; > +} > + > +static int lm3601x_strobe_get(struct led_classdev_flash *fled_cdev, > + bool *state) > +{ > + struct lm3601x_led *led = fled_cdev_to_led(fled_cdev); > + int ret; > + int strobe_state; > + > + mutex_lock(&led->lock); > + > + ret = regmap_read(led->regmap, LM3601X_ENABLE_REG, &strobe_state); > + if (ret < 0) > + goto out; > + > + *state = strobe_state & LM3601X_MODE_STROBE; > + > +out: > + mutex_unlock(&led->lock); > + return ret; > +} > + > +static int lm3601x_strobe_fault_get(struct led_classdev_flash *fled_cdev, > + u32 *fault) > +{ > + struct lm3601x_led *led = fled_cdev_to_led(fled_cdev); > + > + lm3601x_read_faults(led); > + > + *fault = led->last_flag; > + > + return 0; > +} > + > +static const struct led_flash_ops strobe_ops = { > + .flash_brightness_set = lm3601x_strobe_brightness_set, s/strobe/flash/ > + .strobe_set = lm3601x_strobe_set, > + .strobe_get = lm3601x_strobe_get, > + .timeout_set = lm3601x_strobe_timeout_set, Ditto. > + .fault_get = lm3601x_strobe_fault_get, Ditto. > +}; > + > +static int lm3601x_register_leds(struct lm3601x_led *led) > +{ > + struct led_classdev *led_cdev; > + struct led_flash_setting *setting; > + > + led->fled_cdev.ops = &strobe_ops; > + > + setting = &led->fled_cdev.timeout; > + setting->min = LM3601X_MIN_TIMEOUT_US; > + setting->max = led->max_strobe_timeout; > + setting->step = LM3601X_LOWER_STEP_US; > + setting->val = led->max_strobe_timeout; > + > + setting = &led->fled_cdev.brightness; > + setting->min = LM3601X_MIN_STROBE_I_UA; > + setting->max = LM3601X_MAX_STROBE_I_UA; > + setting->step = LM3601X_TORCH_REG_DIV; > + setting->val = led->strobe_current_max; > + > + led_cdev = &led->fled_cdev.led_cdev; > + led_cdev->name = led->led_name; > + led_cdev->brightness_set_blocking = lm3601x_brightness_set; > + led_cdev->max_brightness = LM3601X_MAX_TORCH_I_UA; LED class brightness is expressed in levels, so: led_cdev->max_brightness = DIV_ROUND_UP(LM3601X_MAX_TORCH_I_UA, LM3601X_TORCH_REG_DIV) > + led_cdev->flags |= LED_DEV_CAP_FLASH; > + > + return led_classdev_flash_register(&led->client->dev, &led->fled_cdev); > +} > + > +static int lm3601x_parse_node(struct lm3601x_led *led, > + struct device_node *node) > +{ > + struct fwnode_handle *child = NULL; > + int ret = -ENODEV; > + const char *name; > + > + child = device_get_next_child_node(&led->client->dev, child); > + if (!child) { > + dev_err(&led->client->dev, "No LED Child node\n"); > + return ret; > + } > + > + ret = fwnode_property_read_u32(child, "reg", &led->led_mode); > + if (ret) { > + dev_err(&led->client->dev, "reg DT property missing\n"); > + goto out_err; > + } > + > + if (led->led_mode > LM3601X_LED_TORCH || > + led->led_mode < LM3601X_LED_IR) { > + dev_warn(&led->client->dev, "Invalid led mode requested\n"); > + ret = -EINVAL; > + goto out_err; > + } > + > + ret = fwnode_property_read_string(child, "label", &name); > + if (ret) { > + if (led->led_mode == LM3601X_LED_TORCH) > + name = "torch"; > + else > + name = "infrared"; > + } > + > + snprintf(led->led_name, sizeof(led->led_name), > + "%s:%s", node->name, name); Reading once again my recent explanation regarding this I realized that I didn't provide clear conclusion, which is: we no longer use child node name for LED class device name if label is absent. (apart from that - you're using parent DT node now, i.e. led-controller). Please follow what was done for drivers/leds/leds-cr0014114.c. > + ret = fwnode_property_read_u32(child, "led-max-microamp", > + &led->torch_current_max); > + if (ret < 0) { > + dev_warn(&led->client->dev, > + "led-max-microamp DT property missing\n"); > + goto out_err; > + } > + > + ret = fwnode_property_read_u32(child, "flash-max-microamp", > + &led->strobe_current_max); > + if (ret < 0) { > + dev_warn(&led->client->dev, > + "flash-max-microamp DT property missing\n"); > + goto out_err; > + } > + > + ret = fwnode_property_read_u32(child, "flash-max-timeout-us", > + &led->max_strobe_timeout); > + if (ret < 0) { > + dev_warn(&led->client->dev, > + "flash-max-timeout-us DT property missing\n"); > + goto out_err; > + } > + > +out_err: > + fwnode_handle_put(child); > + return ret; > +} > + > +static int lm3601x_probe(struct i2c_client *client, > + const struct i2c_device_id *id) > +{ > + struct lm3601x_led *led; > + int err; > + > + led = devm_kzalloc(&client->dev, sizeof(*led), GFP_KERNEL); > + if (!led) > + return -ENOMEM; > + > + led->client = client; > + i2c_set_clientdata(client, led); > + > + err = lm3601x_parse_node(led, client->dev.of_node); > + if (err < 0) > + return -ENODEV; > + > + led->regmap = devm_regmap_init_i2c(client, &lm3601x_regmap); > + if (IS_ERR(led->regmap)) { > + err = PTR_ERR(led->regmap); > + dev_err(&client->dev, > + "Failed to allocate register map: %d\n", err); > + return err; > + } > + > + mutex_init(&led->lock); > + > + err = lm3601x_register_leds(led); return lm3601x_register_leds(led) > + > + return err; > +} > + > +static int lm3601x_remove(struct i2c_client *client) > +{ > + struct lm3601x_led *led = i2c_get_clientdata(client); > + > + regmap_update_bits(led->regmap, LM3601X_ENABLE_REG, > + LM3601X_ENABLE_MASK, > + LM3601X_MODE_STANDBY); > + mutex_destroy() is missing. > + return 0; > +} > + > +static const struct i2c_device_id lm3601x_id[] = { > + { "LM36010", CHIP_LM36010 }, > + { "LM36011", CHIP_LM36011 }, > + { } > +}; > +MODULE_DEVICE_TABLE(i2c, lm3601x_id); > + > +static const struct of_device_id of_lm3601x_leds_match[] = { > + { .compatible = "ti,lm36010", }, > + { .compatible = "ti,lm36011", }, > + { } > +}; > +MODULE_DEVICE_TABLE(of, of_lm3601x_leds_match); > + > +static struct i2c_driver lm3601x_i2c_driver = { > + .driver = { > + .name = "lm3601x", > + .of_match_table = of_lm3601x_leds_match, > + }, > + .probe = lm3601x_probe, > + .remove = lm3601x_remove, > + .id_table = lm3601x_id, > +}; > +module_i2c_driver(lm3601x_i2c_driver); > + > +MODULE_DESCRIPTION("Texas Instruments Flash Lighting driver for LM3601X"); > +MODULE_AUTHOR("Dan Murphy "); > +MODULE_LICENSE("GPL v2"); > -- Best regards, Jacek Anaszewski