745 lines
18 KiB
C
745 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
// TI LM3532 LED driver
|
|
// Copyright (C) 2019 Texas Instruments Incorporated - https://www.ti.com/
|
|
// https://www.ti.com/lit/ds/symlink/lm3532.pdf
|
|
|
|
#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_FS_CURR 0x17
|
|
#define LM3532_REG_ZONE_CFG_B 0x18
|
|
#define LM3532_REG_CTRL_B_FS_CURR 0x19
|
|
#define LM3532_REG_ZONE_CFG_C 0x1a
|
|
#define LM3532_REG_CTRL_C_FS_CURR 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_ZONE_TRGT_A 0x70
|
|
#define LM3532_REG_ZONE_TRGT_B 0x75
|
|
#define LM3532_REG_ZONE_TRGT_C 0x7a
|
|
#define LM3532_REG_MAX 0x7e
|
|
|
|
/* Control 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
|
|
|
|
#define LM3532_FS_CURR_MIN 5000
|
|
#define LM3532_FS_CURR_MAX 29800
|
|
#define LM3532_FS_CURR_STEP 800
|
|
|
|
/*
|
|
* 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
|
|
* @ctrl_brt_pointer: Zone target register that controls the sink
|
|
* @num_leds: Number of LED strings are supported in this array
|
|
* @full_scale_current: The full-scale current setting for the current sink.
|
|
* @led_strings: The LED strings supported in this array
|
|
* @enabled: Enabled status
|
|
*/
|
|
struct lm3532_led {
|
|
struct led_classdev led_dev;
|
|
struct lm3532_data *priv;
|
|
|
|
int control_bank;
|
|
int mode;
|
|
int ctrl_brt_pointer;
|
|
int num_leds;
|
|
int full_scale_current;
|
|
unsigned int enabled:1;
|
|
u32 led_strings[LM3532_MAX_CONTROL_BANKS];
|
|
};
|
|
|
|
/**
|
|
* 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_FS_CURR, 0xf3},
|
|
{LM3532_REG_ZONE_CFG_B, 0xf1},
|
|
{LM3532_REG_CTRL_B_FS_CURR, 0xf3},
|
|
{LM3532_REG_ZONE_CFG_C, 0xf1},
|
|
{LM3532_REG_CTRL_C_FS_CURR, 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,
|
|
};
|
|
|
|
static const 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;
|
|
}
|
|
|
|
static const 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);
|
|
}
|
|
|
|
static const 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);
|
|
}
|
|
|
|
/* Caller must take care of locking */
|
|
static int lm3532_led_enable(struct lm3532_led *led_data)
|
|
{
|
|
int ctrl_en_val = BIT(led_data->control_bank);
|
|
int ret;
|
|
|
|
if (led_data->enabled)
|
|
return 0;
|
|
|
|
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;
|
|
}
|
|
|
|
ret = regulator_enable(led_data->priv->regulator);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
led_data->enabled = 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Caller must take care of locking */
|
|
static int lm3532_led_disable(struct lm3532_led *led_data)
|
|
{
|
|
int ctrl_en_val = BIT(led_data->control_bank);
|
|
int ret;
|
|
|
|
if (!led_data->enabled)
|
|
return 0;
|
|
|
|
ret = regmap_update_bits(led_data->priv->regmap, LM3532_REG_ENABLE,
|
|
ctrl_en_val, 0);
|
|
if (ret) {
|
|
dev_err(led_data->priv->dev, "Failed to set ctrl:%d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
ret = regulator_disable(led_data->priv->regulator);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
led_data->enabled = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
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_ALS_CTRL) {
|
|
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_ZONE_TRGT_A + led->control_bank * 5 +
|
|
(led->ctrl_brt_pointer >> 2);
|
|
|
|
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;
|
|
unsigned int brightness_config_reg;
|
|
unsigned int brightness_config_val;
|
|
int fs_current_reg;
|
|
int fs_current_val;
|
|
int ret, i;
|
|
|
|
if (drvdata->enable_gpio)
|
|
gpiod_direction_output(drvdata->enable_gpio, 1);
|
|
|
|
brightness_config_reg = LM3532_REG_ZONE_CFG_A + led->control_bank * 2;
|
|
/*
|
|
* This could be hard coded to the default value but the control
|
|
* brightness register may have changed during boot.
|
|
*/
|
|
ret = regmap_read(drvdata->regmap, brightness_config_reg,
|
|
&led->ctrl_brt_pointer);
|
|
if (ret)
|
|
return ret;
|
|
|
|
led->ctrl_brt_pointer &= LM3532_ZONE_MASK;
|
|
brightness_config_val = led->ctrl_brt_pointer | led->mode;
|
|
ret = regmap_write(drvdata->regmap, brightness_config_reg,
|
|
brightness_config_val);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (led->full_scale_current) {
|
|
fs_current_reg = LM3532_REG_CTRL_A_FS_CURR + led->control_bank * 2;
|
|
fs_current_val = (led->full_scale_current - LM3532_FS_CURR_MIN) /
|
|
LM3532_FS_CURR_STEP;
|
|
|
|
ret = regmap_write(drvdata->regmap, fs_current_reg,
|
|
fs_current_val);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
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 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));
|
|
|
|
return regmap_write(priv->regmap, LM3532_ALS_CONFIG, als->config);
|
|
}
|
|
|
|
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;
|
|
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) {
|
|
struct led_init_data idata = {
|
|
.fwnode = child,
|
|
.default_label = ":",
|
|
.devicename = priv->client->name,
|
|
};
|
|
|
|
led = &priv->leds[i];
|
|
|
|
ret = fwnode_property_read_u32(child, "reg", &control_bank);
|
|
if (ret) {
|
|
dev_err(&priv->client->dev, "reg property missing\n");
|
|
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");
|
|
goto child_out;
|
|
}
|
|
|
|
if (fwnode_property_present(child, "led-max-microamp") &&
|
|
fwnode_property_read_u32(child, "led-max-microamp",
|
|
&led->full_scale_current))
|
|
dev_err(&priv->client->dev,
|
|
"Failed getting led-max-microamp\n");
|
|
else
|
|
led->full_scale_current = min(led->full_scale_current,
|
|
LM3532_FS_CURR_MAX);
|
|
|
|
if (led->mode == LM3532_BL_MODE_ALS) {
|
|
led->mode = LM3532_ALS_CTRL;
|
|
ret = lm3532_parse_als(priv);
|
|
if (ret)
|
|
dev_err(&priv->client->dev, "Failed to parse als\n");
|
|
else
|
|
lm3532_als_configure(priv, led);
|
|
} else {
|
|
led->mode = LM3532_I2C_CTRL;
|
|
}
|
|
|
|
led->num_leds = fwnode_property_count_u32(child, "led-sources");
|
|
if (led->num_leds > LM3532_MAX_LED_STRINGS) {
|
|
dev_err(&priv->client->dev, "Too 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");
|
|
goto child_out;
|
|
}
|
|
|
|
led->priv = priv;
|
|
led->led_dev.brightness_set_blocking = lm3532_brightness_set;
|
|
|
|
ret = devm_led_classdev_register_ext(priv->dev, &led->led_dev, &idata);
|
|
if (ret) {
|
|
dev_err(&priv->client->dev, "led register err: %d\n",
|
|
ret);
|
|
goto child_out;
|
|
}
|
|
|
|
ret = lm3532_init_registers(led);
|
|
if (ret) {
|
|
dev_err(&priv->client->dev, "register init err: %d\n",
|
|
ret);
|
|
goto child_out;
|
|
}
|
|
|
|
i++;
|
|
}
|
|
return 0;
|
|
|
|
child_out:
|
|
fwnode_handle_put(child);
|
|
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;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int lm3532_remove(struct i2c_client *client)
|
|
{
|
|
struct lm3532_data *drvdata = i2c_get_clientdata(client);
|
|
|
|
mutex_destroy(&drvdata->lock);
|
|
|
|
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@ti.com>");
|