Andrew Thanks On 11/15/2017 09:48 PM, Andrew F. Davis wrote: > On 11/13/2017 02:50 PM, Dan Murphy wrote: >> 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@xxxxxx> >> --- > > Looks like v3 is posted but I can't find it in my mailbox :/ but the > comments below should still be valid. v3 did post and some of the changes you pointed out were made > >> drivers/leds/leds-lm3692x.c | 380 ++++++++++++++++++++++++++++++++++++++++++++ >> 1 file changed, 380 insertions(+) >> create mode 100644 drivers/leds/leds-lm3692x.c >> >> diff --git a/drivers/leds/leds-lm3692x.c b/drivers/leds/leds-lm3692x.c >> new file mode 100644 >> index 000000000000..beb753abc7b0 >> --- /dev/null >> +++ b/drivers/leds/leds-lm3692x.c >> @@ -0,0 +1,380 @@ >> +/* >> + * TI lm3692x LED Driver >> + * >> + * Copyright (C) 2017 Texas Instruments >> + * >> + * Author: Dan Murphy <dmurphy@xxxxxx> >> + * >> + * 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/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)) > > The above look like you are just counting in binary, I'd just list the > numbers then shift them by one. This is just another way to do it. Its just a matter of preference. > >> +#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)) > > Same here, looks like a couple below too. Same as above > >> +#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) >> + goto out; >> + >> + fault = read_buf; >> + >> + if (fault) >> + dev_err(&led->client->dev, "Detected a fault 0x%X\n", >> + fault); >> +out: >> + 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 led_brightness = (brt_val << 4) + 7; > > Magic numbers? > > BRIGHTNESS_SHIFT/MASK maybe? > > And below we undo the operation anyway before we write it to the > register. Why not just drop that and to the shift/mask when you write it. > v3 has this changed anyway to something newer. <snip> -- ------------------ Dan Murphy -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
