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SubjectRe: [PATCH 2/2] leds: lm3692x: Introduce LM3692x dual string driver
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Date
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@ti.com>
>> ---
>
> 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@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.
>> + *
>> + */
>> +
>> +#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
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