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Date: Wed, 20 Mar 2019 14:04:58 -0500
From: Dan Murphy <dmurphy@...com>
To: Jacek Anaszewski <jacek.anaszewski@...il.com>,
<robh+dt@...nel.org>, <pavel@....cz>, <tony@...mide.com>,
<lee.jones@...aro.org>
CC: <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linux-leds@...r.kernel.org>
Subject: Re: [PATCH v4 4/4] leds: lm3532: Introduce the lm3532 LED driver
Jacek
On 3/20/19 1:59 PM, Jacek Anaszewski wrote:
> Hi Dan,
>
> I have one minor issue below.
>
> On 3/13/19 1:32 PM, Dan Murphy wrote:
>> Introduce the Texas Instruments LM3532 White LED driver.
>> The driver supports ALS configurability or manual brightness
>> control.
>>
>> The driver also supports associating LED strings with specific
>> control banks in a group or as individually controlled strings.
>>
>> Signed-off-by: Dan Murphy <dmurphy@...com>
>> ---
>>
>> v4 - Updated code to DT doc changes appending "ti," to TI specific properties -
>> https://lore.kernel.org/patchwork/patch/1050124/
>>
>> v3 - Removed switch case for register setting in favor of an algorithim (v1 comment),
>> https://lore.kernel.org/patchwork/patch/1049024/
>> v2 - Added look up tables for als_avg, als_imp and ramp times, fixed brightness
>> control when ALS is in control, added property value checks to ensure the values
>> are not out of bounds - https://lore.kernel.org/patchwork/patch/1048807/
>>
>> drivers/leds/Kconfig | 10 +
>> drivers/leds/Makefile | 1 +
>> drivers/leds/leds-lm3532.c | 681 +++++++++++++++++++++++++++++++++++++
>> 3 files changed, 692 insertions(+)
>> create mode 100644 drivers/leds/leds-lm3532.c
>>
>> diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
>> index a72f97fca57b..da00b9ed5a5c 100644
>> --- a/drivers/leds/Kconfig
>> +++ b/drivers/leds/Kconfig
>> @@ -138,6 +138,16 @@ config LEDS_LM3530
>> controlled manually or using PWM input or using ambient
>> light automatically.
>> +config LEDS_LM3532
>> + tristate "LCD Backlight driver for LM3532"
>> + depends on LEDS_CLASS
>> + depends on I2C
>> + help
>> + This option enables support for the LCD backlight using
>> + LM3532 ambient light sensor chip. This ALS chip can be
>> + controlled manually or using PWM input or using ambient
>> + light automatically.
>> +
>> config LEDS_LM3533
>> tristate "LED support for LM3533"
>> depends on LEDS_CLASS
>> diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
>> index 4c1b0054f379..7a8b1f55d459 100644
>> --- a/drivers/leds/Makefile
>> +++ b/drivers/leds/Makefile
>> @@ -18,6 +18,7 @@ obj-$(CONFIG_LEDS_BD2802) += leds-bd2802.o
>> obj-$(CONFIG_LEDS_CPCAP) += leds-cpcap.o
>> obj-$(CONFIG_LEDS_LOCOMO) += leds-locomo.o
>> obj-$(CONFIG_LEDS_LM3530) += leds-lm3530.o
>> +obj-$(CONFIG_LEDS_LM3532) += leds-lm3532.o
>> obj-$(CONFIG_LEDS_LM3533) += leds-lm3533.o
>> obj-$(CONFIG_LEDS_LM3642) += leds-lm3642.o
>> obj-$(CONFIG_LEDS_MIKROTIK_RB532) += leds-rb532.o
>> diff --git a/drivers/leds/leds-lm3532.c b/drivers/leds/leds-lm3532.c
>> new file mode 100644
>> index 000000000000..e8a614d71469
>> --- /dev/null
>> +++ b/drivers/leds/leds-lm3532.c
>> @@ -0,0 +1,681 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +// TI LM3532 LED driver
>> +// Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/
>> +
>> +#include <linux/i2c.h>
>> +#include <linux/leds.h>
>> +#include <linux/slab.h>
>> +#include <linux/regmap.h>
>> +#include <linux/types.h>
>> +#include <linux/regulator/consumer.h>
>> +#include <linux/module.h>
>> +#include <uapi/linux/uleds.h>
>> +#include <linux/gpio/consumer.h>
>> +
>> +#define LM3532_NAME "lm3532-led"
>> +#define LM3532_BL_MODE_MANUAL 0x00
>> +#define LM3532_BL_MODE_ALS 0x01
>> +
>> +#define LM3532_REG_OUTPUT_CFG 0x10
>> +#define LM3532_REG_STARTSHUT_RAMP 0x11
>> +#define LM3532_REG_RT_RAMP 0x12
>> +#define LM3532_REG_PWM_A_CFG 0x13
>> +#define LM3532_REG_PWM_B_CFG 0x14
>> +#define LM3532_REG_PWM_C_CFG 0x15
>> +#define LM3532_REG_ZONE_CFG_A 0x16
>> +#define LM3532_REG_CTRL_A_BRT 0x17
>> +#define LM3532_REG_ZONE_CFG_B 0x18
>> +#define LM3532_REG_CTRL_B_BRT 0x19
>> +#define LM3532_REG_ZONE_CFG_C 0x1a
>> +#define LM3532_REG_CTRL_C_BRT 0x1b
>> +#define LM3532_REG_ENABLE 0x1d
>> +#define LM3532_ALS_CONFIG 0x23
>> +#define LM3532_REG_ZN_0_HI 0x60
>> +#define LM3532_REG_ZN_0_LO 0x61
>> +#define LM3532_REG_ZN_1_HI 0x62
>> +#define LM3532_REG_ZN_1_LO 0x63
>> +#define LM3532_REG_ZN_2_HI 0x64
>> +#define LM3532_REG_ZN_2_LO 0x65
>> +#define LM3532_REG_ZN_3_HI 0x66
>> +#define LM3532_REG_ZN_3_LO 0x67
>> +#define LM3532_REG_MAX 0x7e
>> +
>> +/* Contorl Enable */
>> +#define LM3532_CTRL_A_ENABLE BIT(0)
>> +#define LM3532_CTRL_B_ENABLE BIT(1)
>> +#define LM3532_CTRL_C_ENABLE BIT(2)
>> +
>> +/* PWM Zone Control */
>> +#define LM3532_PWM_ZONE_MASK 0x7c
>> +#define LM3532_PWM_ZONE_0_EN BIT(2)
>> +#define LM3532_PWM_ZONE_1_EN BIT(3)
>> +#define LM3532_PWM_ZONE_2_EN BIT(4)
>> +#define LM3532_PWM_ZONE_3_EN BIT(5)
>> +#define LM3532_PWM_ZONE_4_EN BIT(6)
>> +
>> +/* Brightness Configuration */
>> +#define LM3532_I2C_CTRL BIT(0)
>> +#define LM3532_ALS_CTRL 0
>> +#define LM3532_LINEAR_MAP BIT(1)
>> +#define LM3532_ZONE_MASK (BIT(2) | BIT(3) | BIT(4))
>> +#define LM3532_ZONE_0 0
>> +#define LM3532_ZONE_1 BIT(2)
>> +#define LM3532_ZONE_2 BIT(3)
>> +#define LM3532_ZONE_3 (BIT(2) | BIT(3))
>> +#define LM3532_ZONE_4 BIT(4)
>> +
>> +#define LM3532_ENABLE_ALS BIT(3)
>> +#define LM3532_ALS_SEL_SHIFT 6
>> +
>> +/* Zone Boundary Register */
>> +#define LM3532_ALS_WINDOW_mV 2000
>> +#define LM3532_ALS_ZB_MAX 4
>> +#define LM3532_ALS_OFFSET_mV 2
>> +
>> +#define LM3532_CONTROL_A 0
>> +#define LM3532_CONTROL_B 1
>> +#define LM3532_CONTROL_C 2
>> +#define LM3532_MAX_CONTROL_BANKS 3
>> +#define LM3532_MAX_LED_STRINGS 3
>> +
>> +#define LM3532_OUTPUT_CFG_MASK 0x3
>> +#define LM3532_BRT_VAL_ADJUST 8
>> +#define LM3532_RAMP_DOWN_SHIFT 3
>> +
>> +#define LM3532_NUM_RAMP_VALS 8
>> +#define LM3532_NUM_AVG_VALS 8
>> +#define LM3532_NUM_IMP_VALS 32
>> +
>> +/*
>> + * struct lm3532_als_data
>> + * @config - value of ALS configuration register
>> + * @als1_imp_sel - value of ALS1 resistor select register
>> + * @als2_imp_sel - value of ALS2 resistor select register
>> + * @als_avrg_time - ALS averaging time
>> + * @als_input_mode - ALS input mode for brightness control
>> + * @als_vmin - Minimum ALS voltage
>> + * @als_vmax - Maximum ALS voltage
>> + * @zone_lo - values of ALS lo ZB(Zone Boundary) registers
>> + * @zone_hi - values of ALS hi ZB(Zone Boundary) registers
>> + */
>> +struct lm3532_als_data {
>> + u8 config;
>> + u8 als1_imp_sel;
>> + u8 als2_imp_sel;
>> + u8 als_avrg_time;
>> + u8 als_input_mode;
>> + u32 als_vmin;
>> + u32 als_vmax;
>> + u8 zones_lo[LM3532_ALS_ZB_MAX];
>> + u8 zones_hi[LM3532_ALS_ZB_MAX];
>> +};
>> +
>> +/**
>> + * struct lm3532_led
>> + * @led_dev: led class device
>> + * @priv - Pointer the device data structure
>> + * @control_bank - Control bank the LED is associated to
>> + * @mode - Mode of the LED string
>> + * @num_leds - Number of LED strings are supported in this array
>> + * @led_strings - The LED strings supported in this array
>> + * @label - LED label
>> + */
>> +struct lm3532_led {
>> + struct led_classdev led_dev;
>> + struct lm3532_data *priv;
>> +
>> + int control_bank;
>> + int mode;
>> + int num_leds;
>> + u32 led_strings[LM3532_MAX_CONTROL_BANKS];
>> + char label[LED_MAX_NAME_SIZE];
>> +};
>> +
>> +/**
>> + * struct lm3532_data
>> + * @enable_gpio - Hardware enable gpio
>> + * @regulator: regulator
>> + * @client: i2c client
>> + * @regmap - Devices register map
>> + * @dev - Pointer to the devices device struct
>> + * @lock - Lock for reading/writing the device
>> + * @als_data - Pointer to the als data struct
>> + * @runtime_ramp_up - Runtime ramp up setting
>> + * @runtime_ramp_down - Runtime ramp down setting
>> + * @leds - Array of LED strings
>> + */
>> +struct lm3532_data {
>> + struct gpio_desc *enable_gpio;
>> + struct regulator *regulator;
>> + struct i2c_client *client;
>> + struct regmap *regmap;
>> + struct device *dev;
>> + struct mutex lock;
>> +
>> + struct lm3532_als_data *als_data;
>> +
>> + u32 runtime_ramp_up;
>> + u32 runtime_ramp_down;
>> +
>> + struct lm3532_led leds[];
>> +};
>> +
>> +static const struct reg_default lm3532_reg_defs[] = {
>> + {LM3532_REG_OUTPUT_CFG, 0xe4},
>> + {LM3532_REG_STARTSHUT_RAMP, 0xc0},
>> + {LM3532_REG_RT_RAMP, 0xc0},
>> + {LM3532_REG_PWM_A_CFG, 0x82},
>> + {LM3532_REG_PWM_B_CFG, 0x82},
>> + {LM3532_REG_PWM_C_CFG, 0x82},
>> + {LM3532_REG_ZONE_CFG_A, 0xf1},
>> + {LM3532_REG_CTRL_A_BRT, 0xf3},
>> + {LM3532_REG_ZONE_CFG_B, 0xf1},
>> + {LM3532_REG_CTRL_B_BRT, 0xf3},
>> + {LM3532_REG_ZONE_CFG_C, 0xf1},
>> + {LM3532_REG_CTRL_C_BRT, 0xf3},
>> + {LM3532_REG_ENABLE, 0xf8},
>> + {LM3532_ALS_CONFIG, 0x44},
>> + {LM3532_REG_ZN_0_HI, 0x35},
>> + {LM3532_REG_ZN_0_LO, 0x33},
>> + {LM3532_REG_ZN_1_HI, 0x6a},
>> + {LM3532_REG_ZN_1_LO, 0x66},
>> + {LM3532_REG_ZN_2_HI, 0xa1},
>> + {LM3532_REG_ZN_2_LO, 0x99},
>> + {LM3532_REG_ZN_3_HI, 0xdc},
>> + {LM3532_REG_ZN_3_LO, 0xcc},
>> +};
>> +
>> +static const struct regmap_config lm3532_regmap_config = {
>> + .reg_bits = 8,
>> + .val_bits = 8,
>> +
>> + .max_register = LM3532_REG_MAX,
>> + .reg_defaults = lm3532_reg_defs,
>> + .num_reg_defaults = ARRAY_SIZE(lm3532_reg_defs),
>> + .cache_type = REGCACHE_FLAT,
>> +};
>> +
>> +const static int als_imp_table[LM3532_NUM_IMP_VALS] = {37000, 18500, 12330,
>> + 92500, 7400, 6170, 5290,
>> + 4630, 4110, 3700, 3360,
>> + 3080, 2850, 2640, 2440,
>> + 2310, 2180, 2060, 1950,
>> + 1850, 1760, 1680, 1610,
>> + 1540, 1480, 1420, 1370,
>> + 1320, 1280, 1230, 1190};
>> +static int lm3532_get_als_imp_index(int als_imped)
>> +{
>> + int i;
>> +
>> + if (als_imped > als_imp_table[1])
>> + return 0;
>> +
>> + if (als_imped < als_imp_table[LM3532_NUM_IMP_VALS - 1])
>> + return LM3532_NUM_IMP_VALS - 1;
>> +
>> + for (i = 1; i < LM3532_NUM_IMP_VALS; i++) {
>> + if (als_imped == als_imp_table[i])
>> + return i;
>> +
>> + /* Find an approximate index by looking up the table */
>> + if (als_imped < als_imp_table[i - 1] &&
>> + als_imped > als_imp_table[i]) {
>> + if (als_imped - als_imp_table[i - 1] <
>> + als_imp_table[i] - als_imped)
>> + return i + 1;
>> + else
>> + return i;
>> + }
>> + }
>> +
>> + return -EINVAL;
>> +}
>> +
>> +static int lm3532_get_index(const int table[], int size, int value)
>> +{
>> + int i;
>> +
>> + for (i = 1; i < size; i++) {
>> + if (value == table[i])
>> + return i;
>> +
>> + /* Find an approximate index by looking up the table */
>> + if (value > table[i - 1] &&
>> + value < table[i]) {
>> + if (value - table[i - 1] < table[i] - value)
>> + return i - 1;
>> + else
>> + return i;
>> + }
>> + }
>> +
>> + return -EINVAL;
>> +}
>> +
>> +const static int als_avrg_table[LM3532_NUM_AVG_VALS] = {17920, 35840, 71680,
>> + 1433360, 286720, 573440,
>> + 1146880, 2293760};
>> +static int lm3532_get_als_avg_index(int avg_time)
>> +{
>> + if (avg_time <= als_avrg_table[0])
>> + return 0;
>> +
>> + if (avg_time > als_avrg_table[LM3532_NUM_AVG_VALS - 1])
>> + return LM3532_NUM_AVG_VALS - 1;
>> +
>> + return lm3532_get_index(&als_avrg_table[0], LM3532_NUM_AVG_VALS,
>> + avg_time);
>> +}
>> +
>> +const static int ramp_table[LM3532_NUM_RAMP_VALS] = { 8, 1024, 2048, 4096, 8192,
>> + 16384, 32768, 65536};
>> +static int lm3532_get_ramp_index(int ramp_time)
>> +{
>> + if (ramp_time <= ramp_table[0])
>> + return 0;
>> +
>> + if (ramp_time > ramp_table[LM3532_NUM_RAMP_VALS - 1])
>> + return LM3532_NUM_RAMP_VALS - 1;
>> +
>> + return lm3532_get_index(&ramp_table[0], LM3532_NUM_RAMP_VALS,
>> + ramp_time);
>> +}
>> +
>> +static int lm3532_led_enable(struct lm3532_led *led_data)
>> +{
>> + int ctrl_en_val = BIT(led_data->control_bank);
>> + int ret;
>> +
>> + ret = regmap_update_bits(led_data->priv->regmap, LM3532_REG_ENABLE,
>> + ctrl_en_val, ctrl_en_val);
>> + if (ret) {
>> + dev_err(led_data->priv->dev, "Failed to set ctrl:%d\n", ret);
>> + return ret;
>> + }
>> +
>> + return regulator_enable(led_data->priv->regulator);
>> +}
>> +
>> +static int lm3532_led_disable(struct lm3532_led *led_data)
>> +{
>> + int ctrl_en_val = BIT(led_data->control_bank);
>> + int ret;
>> +
>> + ret = regmap_update_bits(led_data->priv->regmap, LM3532_REG_ENABLE,
>> + ctrl_en_val, ~ctrl_en_val);
>> + if (ret) {
>> + dev_err(led_data->priv->dev, "Failed to set ctrl:%d\n", ret);
>> + return ret;
>> + }
>> +
>> + return regulator_disable(led_data->priv->regulator);
>> +}
>> +
>> +static int lm3532_brightness_set(struct led_classdev *led_cdev,
>> + enum led_brightness brt_val)
>> +{
>> + struct lm3532_led *led =
>> + container_of(led_cdev, struct lm3532_led, led_dev);
>> + u8 brightness_reg;
>> + int ret;
>> +
>> + mutex_lock(&led->priv->lock);
>> +
>> + if (led->mode == LM3532_BL_MODE_ALS) {
>> + if (brt_val > LED_OFF)
>> + ret = lm3532_led_enable(led);
>> + else
>> + ret = lm3532_led_disable(led);
>> +
>> + goto unlock;
>> + }
>> +
>> + if (brt_val == LED_OFF) {
>> + ret = lm3532_led_disable(led);
>> + goto unlock;
>> + }
>> +
>> + ret = lm3532_led_enable(led);
>> + if (ret)
>> + goto unlock;
>> +
>> + brightness_reg = LM3532_REG_CTRL_A_BRT + led->control_bank * 2;
>> + brt_val = brt_val / LM3532_BRT_VAL_ADJUST;
>> +
>> + ret = regmap_write(led->priv->regmap, brightness_reg, brt_val);
>> +
>> +unlock:
>> + mutex_unlock(&led->priv->lock);
>> + return ret;
>> +}
>> +
>> +static int lm3532_init_registers(struct lm3532_led *led)
>> +{
>> + struct lm3532_data *drvdata = led->priv;
>> + unsigned int runtime_ramp_val;
>> + unsigned int output_cfg_val = 0;
>> + unsigned int output_cfg_shift = 0;
>> + unsigned int output_cfg_mask = 0;
>> + int ret, i;
>> +
>> + for (i = 0; i < led->num_leds; i++) {
>> + output_cfg_shift = led->led_strings[i] * 2;
>> + output_cfg_val |= (led->control_bank << output_cfg_shift);
>> + output_cfg_mask |= LM3532_OUTPUT_CFG_MASK << output_cfg_shift;
>> + }
>> +
>> + ret = regmap_update_bits(drvdata->regmap, LM3532_REG_OUTPUT_CFG,
>> + output_cfg_mask, output_cfg_val);
>> + if (ret)
>> + return ret;
>> +
>> + runtime_ramp_val = drvdata->runtime_ramp_up |
>> + (drvdata->runtime_ramp_down << LM3532_RAMP_DOWN_SHIFT);
>> +
>> + return regmap_write(drvdata->regmap, LM3532_REG_RT_RAMP,
>> + runtime_ramp_val);
>> +}
>> +
>> +static int lm3532_als_configure(struct lm3532_data *priv,
>> + struct lm3532_led *led)
>> +{
>> + struct lm3532_als_data *als = priv->als_data;
>> + u32 als_vmin, als_vmax, als_vstep;
>> + int zone_reg = LM3532_REG_ZN_0_HI;
>> + int brightnes_config_reg;
>> + int ret;
>> + int i;
>> +
>> + als_vmin = als->als_vmin;
>> + als_vmax = als->als_vmax;
>> +
>> + als_vstep = (als_vmax - als_vmin) / ((LM3532_ALS_ZB_MAX + 1) * 2);
>> +
>> + for (i = 0; i < LM3532_ALS_ZB_MAX; i++) {
>> + als->zones_lo[i] = ((als_vmin + als_vstep + (i * als_vstep)) *
>> + LED_FULL) / 1000;
>> + als->zones_hi[i] = ((als_vmin + LM3532_ALS_OFFSET_mV +
>> + als_vstep + (i * als_vstep)) * LED_FULL) / 1000;
>> +
>> + zone_reg = LM3532_REG_ZN_0_HI + i * 2;
>> + ret = regmap_write(priv->regmap, zone_reg, als->zones_lo[i]);
>> + if (ret)
>> + return ret;
>> +
>> + zone_reg += 1;
>> + ret = regmap_write(priv->regmap, zone_reg, als->zones_hi[i]);
>> + if (ret)
>> + return ret;
>> + }
>> +
>> + als->config = (als->als_avrg_time | (LM3532_ENABLE_ALS) |
>> + (als->als_input_mode << LM3532_ALS_SEL_SHIFT));
>> +
>> + ret = regmap_write(priv->regmap, LM3532_ALS_CONFIG, als->config);
>> + if (ret)
>> + return ret;
>> +
>> + brightnes_config_reg = LM3532_REG_ZONE_CFG_A + led->control_bank * 2;
>> +
>> + return regmap_update_bits(priv->regmap, brightnes_config_reg,
>> + LM3532_I2C_CTRL, LM3532_ALS_CTRL);
>> +}
>> +
>> +static int lm3532_parse_als(struct lm3532_data *priv)
>> +{
>> + struct lm3532_als_data *als;
>> + int als_avg_time;
>> + int als_impedance;
>> + int ret;
>> +
>> + als = devm_kzalloc(priv->dev, sizeof(*als), GFP_KERNEL);
>> + if (als == NULL)
>> + return -ENOMEM;
>> +
>> + ret = device_property_read_u32(&priv->client->dev, "ti,als-vmin",
>> + &als->als_vmin);
>> + if (ret)
>> + als->als_vmin = 0;
>> +
>> + ret = device_property_read_u32(&priv->client->dev, "ti,als-vmax",
>> + &als->als_vmax);
>> + if (ret)
>> + als->als_vmax = LM3532_ALS_WINDOW_mV;
>> +
>> + if (als->als_vmax > LM3532_ALS_WINDOW_mV) {
>> + ret = -EINVAL;
>> + return ret;
>> + }
>> +
>> + ret = device_property_read_u32(&priv->client->dev, "ti,als1-imp-sel",
>> + &als_impedance);
>> + if (ret)
>> + als->als1_imp_sel = 0;
>> + else
>> + als->als1_imp_sel = lm3532_get_als_imp_index(als_impedance);
>> +
>> + ret = device_property_read_u32(&priv->client->dev, "ti,als2-imp-sel",
>> + &als_impedance);
>> + if (ret)
>> + als->als2_imp_sel = 0;
>> + else
>> + als->als2_imp_sel = lm3532_get_als_imp_index(als_impedance);
>> +
>> + ret = device_property_read_u32(&priv->client->dev, "ti,als-avrg-time-us",
>> + &als_avg_time);
>> + if (ret)
>> + als->als_avrg_time = 0;
>> + else
>> + als->als_avrg_time = lm3532_get_als_avg_index(als_avg_time);
>> +
>> + ret = device_property_read_u8(&priv->client->dev, "ti,als-input-mode",
>> + &als->als_input_mode);
>> + if (ret)
>> + als->als_input_mode = 0;
>> +
>> + if (als->als_input_mode > LM3532_BL_MODE_ALS) {
>> + ret = -EINVAL;
>> + return ret;
>> + }
>> +
>> + priv->als_data = als;
>> +
>> + return ret;
>> +}
>> +
>> +static int lm3532_parse_node(struct lm3532_data *priv)
>> +{
>> + struct fwnode_handle *child = NULL;
>> + struct lm3532_led *led;
>> + const char *name;
>> + int control_bank;
>> + u32 ramp_time;
>> + size_t i = 0;
>> + int ret;
>> +
>> + priv->enable_gpio = devm_gpiod_get_optional(&priv->client->dev,
>> + "enable", GPIOD_OUT_LOW);
>> + if (IS_ERR(priv->enable_gpio))
>> + priv->enable_gpio = NULL;
>> +
>> + priv->regulator = devm_regulator_get(&priv->client->dev, "vin");
>> + if (IS_ERR(priv->regulator))
>> + priv->regulator = NULL;
>> +
>> + ret = device_property_read_u32(&priv->client->dev, "ramp-up-us",
>> + &ramp_time);
>> + if (ret)
>> + dev_info(&priv->client->dev, "ramp-up-ms property missing\n");
>> + else
>> + priv->runtime_ramp_up = lm3532_get_ramp_index(ramp_time);
>> +
>> + ret = device_property_read_u32(&priv->client->dev, "ramp-down-us",
>> + &ramp_time);
>> + if (ret)
>> + dev_info(&priv->client->dev, "ramp-down-ms property missing\n");
>> + else
>> + priv->runtime_ramp_down = lm3532_get_ramp_index(ramp_time);
>> +
>> + device_for_each_child_node(priv->dev, child) {
>> + led = &priv->leds[i];
>> +
>> + ret = fwnode_property_read_u32(child, "reg", &control_bank);
>> + if (ret) {
>> + dev_err(&priv->client->dev, "reg property missing\n");
>> + fwnode_handle_put(child);
>> + goto child_out;
>> + }
>> +
>> + if (control_bank > LM3532_CONTROL_C) {
>> + dev_err(&priv->client->dev, "Control bank invalid\n");
>> + continue;
>> + }
>> +
>> + led->control_bank = control_bank;
>> +
>> + ret = fwnode_property_read_u32(child, "ti,led-mode",
>> + &led->mode);
>> + if (ret) {
>> + dev_err(&priv->client->dev, "ti,led-mode property missing\n");
>> + fwnode_handle_put(child);
>> + goto child_out;
>> + }
>> +
>> + if (led->mode == LM3532_BL_MODE_ALS) {
>> + ret = lm3532_parse_als(priv);
>> + if (ret)
>> + dev_err(&priv->client->dev, "Failed to parse als\n");
>> + else
>> + lm3532_als_configure(priv, led);
>> + }
>> +
>> + led->num_leds = fwnode_property_read_u32_array(child,
>> + "led-sources",
>> + NULL, 0);
>> +
>> + if (led->num_leds > LM3532_MAX_LED_STRINGS) {
>> + dev_err(&priv->client->dev, "To many LED string defined\n");
>> + continue;
>> + }
>> +
>> + ret = fwnode_property_read_u32_array(child, "led-sources",
>> + led->led_strings,
>> + led->num_leds);
>> + if (ret) {
>> + dev_err(&priv->client->dev, "led-sources property missing\n");
>> + fwnode_handle_put(child);
>> + goto child_out;
>> + }
>> +
>> + fwnode_property_read_string(child, "linux,default-trigger",
>> + &led->led_dev.default_trigger);
>> +
>> + ret = fwnode_property_read_string(child, "label", &name);
>> + if (ret)
>> + snprintf(led->label, sizeof(led->label),
>> + "%s::", priv->client->name);
>> + else
>> + snprintf(led->label, sizeof(led->label),
>> + "%s:%s", priv->client->name, name);
>> +
>> + led->priv = priv;
>> + led->led_dev.name = led->label;
>> + led->led_dev.brightness_set_blocking = lm3532_brightness_set;
>> +
>> + ret = devm_led_classdev_register(priv->dev, &led->led_dev);
>> + if (ret) {
>> + dev_err(&priv->client->dev, "led register err: %d\n",
>> + ret);
>> + fwnode_handle_put(child);
>> + goto child_out;
>> + }
>> +
>> + lm3532_init_registers(led);
>> +
>> + i++;
>> + }
>> +
>> +child_out:
>> + return ret;
>> +}
>> +
>> +static int lm3532_probe(struct i2c_client *client,
>> + const struct i2c_device_id *id)
>> +{
>> + struct lm3532_data *drvdata;
>> + int ret = 0;
>> + int count;
>> +
>> + count = device_get_child_node_count(&client->dev);
>> + if (!count) {
>> + dev_err(&client->dev, "LEDs are not defined in device tree!");
>> + return -ENODEV;
>> + }
>> +
>> + drvdata = devm_kzalloc(&client->dev, struct_size(drvdata, leds, count),
>> + GFP_KERNEL);
>> + if (drvdata == NULL)
>> + return -ENOMEM;
>> +
>> + drvdata->client = client;
>> + drvdata->dev = &client->dev;
>> +
>> + drvdata->regmap = devm_regmap_init_i2c(client, &lm3532_regmap_config);
>> + if (IS_ERR(drvdata->regmap)) {
>> + ret = PTR_ERR(drvdata->regmap);
>> + dev_err(&client->dev, "Failed to allocate register map: %d\n",
>> + ret);
>> + return ret;
>> + }
>> +
>> + mutex_init(&drvdata->lock);
>> + i2c_set_clientdata(client, drvdata);
>> +
>> + ret = lm3532_parse_node(drvdata);
>> + if (ret) {
>> + dev_err(&client->dev, "Failed to parse node\n");
>> + return ret;
>> + }
>> +
>> + if (drvdata->enable_gpio)
>> + gpiod_direction_output(drvdata->enable_gpio, 1);
>> +
>> + return ret;
>> +}
>> +
>> +static int lm3532_remove(struct i2c_client *client)
>> +{
>> + struct lm3532_data *drvdata = i2c_get_clientdata(client);
> mutex_destroy(&drvdata->lock);
>
Ack. I give post v5 tomorrow.
Dan
>> + if (drvdata->enable_gpio)
>> + gpiod_direction_output(drvdata->enable_gpio, 0);
>> +
>> + return 0;
>> +}
>> +
>> +static const struct of_device_id of_lm3532_leds_match[] = {
>> + { .compatible = "ti,lm3532", },
>> + {},
>> +};
>> +MODULE_DEVICE_TABLE(of, of_lm3532_leds_match);
>> +
>> +static const struct i2c_device_id lm3532_id[] = {
>> + {LM3532_NAME, 0},
>> + {}
>> +};
>> +MODULE_DEVICE_TABLE(i2c, lm3532_id);
>> +
>> +static struct i2c_driver lm3532_i2c_driver = {
>> + .probe = lm3532_probe,
>> + .remove = lm3532_remove,
>> + .id_table = lm3532_id,
>> + .driver = {
>> + .name = LM3532_NAME,
>> + .of_match_table = of_lm3532_leds_match,
>> + },
>> +};
>> +module_i2c_driver(lm3532_i2c_driver);
>> +
>> +MODULE_DESCRIPTION("Back Light driver for LM3532");
>> +MODULE_LICENSE("GPL v2");
>> +MODULE_AUTHOR("Dan Murphy <dmurphy@...com>");
>>
>
--
------------------
Dan Murphy
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