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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Backlight driver for Analog Devices ADP8860 Backlight Devices
*
* Copyright 2009-2010 Analog Devices Inc.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/pm.h>
#include <linux/platform_device.h>
#include <linux/i2c.h>
#include <linux/fb.h>
#include <linux/backlight.h>
#include <linux/leds.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <linux/platform_data/adp8860.h>
#define ADP8860_EXT_FEATURES
#define ADP8860_USE_LEDS
#define ADP8860_MFDVID 0x00 /* Manufacturer and device ID */
#define ADP8860_MDCR 0x01 /* Device mode and status */
#define ADP8860_MDCR2 0x02 /* Device mode and Status Register 2 */
#define ADP8860_INTR_EN 0x03 /* Interrupts enable */
#define ADP8860_CFGR 0x04 /* Configuration register */
#define ADP8860_BLSEN 0x05 /* Sink enable backlight or independent */
#define ADP8860_BLOFF 0x06 /* Backlight off timeout */
#define ADP8860_BLDIM 0x07 /* Backlight dim timeout */
#define ADP8860_BLFR 0x08 /* Backlight fade in and out rates */
#define ADP8860_BLMX1 0x09 /* Backlight (Brightness Level 1-daylight) maximum current */
#define ADP8860_BLDM1 0x0A /* Backlight (Brightness Level 1-daylight) dim current */
#define ADP8860_BLMX2 0x0B /* Backlight (Brightness Level 2-office) maximum current */
#define ADP8860_BLDM2 0x0C /* Backlight (Brightness Level 2-office) dim current */
#define ADP8860_BLMX3 0x0D /* Backlight (Brightness Level 3-dark) maximum current */
#define ADP8860_BLDM3 0x0E /* Backlight (Brightness Level 3-dark) dim current */
#define ADP8860_ISCFR 0x0F /* Independent sink current fade control register */
#define ADP8860_ISCC 0x10 /* Independent sink current control register */
#define ADP8860_ISCT1 0x11 /* Independent Sink Current Timer Register LED[7:5] */
#define ADP8860_ISCT2 0x12 /* Independent Sink Current Timer Register LED[4:1] */
#define ADP8860_ISCF 0x13 /* Independent sink current fade register */
#define ADP8860_ISC7 0x14 /* Independent Sink Current LED7 */
#define ADP8860_ISC6 0x15 /* Independent Sink Current LED6 */
#define ADP8860_ISC5 0x16 /* Independent Sink Current LED5 */
#define ADP8860_ISC4 0x17 /* Independent Sink Current LED4 */
#define ADP8860_ISC3 0x18 /* Independent Sink Current LED3 */
#define ADP8860_ISC2 0x19 /* Independent Sink Current LED2 */
#define ADP8860_ISC1 0x1A /* Independent Sink Current LED1 */
#define ADP8860_CCFG 0x1B /* Comparator configuration */
#define ADP8860_CCFG2 0x1C /* Second comparator configuration */
#define ADP8860_L2_TRP 0x1D /* L2 comparator reference */
#define ADP8860_L2_HYS 0x1E /* L2 hysteresis */
#define ADP8860_L3_TRP 0x1F /* L3 comparator reference */
#define ADP8860_L3_HYS 0x20 /* L3 hysteresis */
#define ADP8860_PH1LEVL 0x21 /* First phototransistor ambient light level-low byte register */
#define ADP8860_PH1LEVH 0x22 /* First phototransistor ambient light level-high byte register */
#define ADP8860_PH2LEVL 0x23 /* Second phototransistor ambient light level-low byte register */
#define ADP8860_PH2LEVH 0x24 /* Second phototransistor ambient light level-high byte register */
#define ADP8860_MANUFID 0x0 /* Analog Devices ADP8860 Manufacturer ID */
#define ADP8861_MANUFID 0x4 /* Analog Devices ADP8861 Manufacturer ID */
#define ADP8863_MANUFID 0x2 /* Analog Devices ADP8863 Manufacturer ID */
#define ADP8860_DEVID(x) ((x) & 0xF)
#define ADP8860_MANID(x) ((x) >> 4)
/* MDCR Device mode and status */
#define INT_CFG (1 << 6)
#define NSTBY (1 << 5)
#define DIM_EN (1 << 4)
#define GDWN_DIS (1 << 3)
#define SIS_EN (1 << 2)
#define CMP_AUTOEN (1 << 1)
#define BLEN (1 << 0)
/* ADP8860_CCFG Main ALS comparator level enable */
#define L3_EN (1 << 1)
#define L2_EN (1 << 0)
#define CFGR_BLV_SHIFT 3
#define CFGR_BLV_MASK 0x3
#define ADP8860_FLAG_LED_MASK 0xFF
#define FADE_VAL(in, out) ((0xF & (in)) | ((0xF & (out)) << 4))
#define BL_CFGR_VAL(law, blv) ((((blv) & CFGR_BLV_MASK) << CFGR_BLV_SHIFT) | ((0x3 & (law)) << 1))
#define ALS_CCFG_VAL(filt) ((0x7 & filt) << 5)
enum {
adp8860,
adp8861,
adp8863
};
struct adp8860_led {
struct led_classdev cdev;
struct work_struct work;
struct i2c_client *client;
enum led_brightness new_brightness;
int id;
int flags;
};
struct adp8860_bl {
struct i2c_client *client;
struct backlight_device *bl;
struct adp8860_led *led;
struct adp8860_backlight_platform_data *pdata;
struct mutex lock;
unsigned long cached_daylight_max;
int id;
int revid;
int current_brightness;
unsigned en_ambl_sens:1;
unsigned gdwn_dis:1;
};
static int adp8860_read(struct i2c_client *client, int reg, uint8_t *val)
{
int ret;
ret = i2c_smbus_read_byte_data(client, reg);
if (ret < 0) {
dev_err(&client->dev, "failed reading at 0x%02x\n", reg);
return ret;
}
*val = (uint8_t)ret;
return 0;
}
static int adp8860_write(struct i2c_client *client, u8 reg, u8 val)
{
return i2c_smbus_write_byte_data(client, reg, val);
}
static int adp8860_set_bits(struct i2c_client *client, int reg, uint8_t bit_mask)
{
struct adp8860_bl *data = i2c_get_clientdata(client);
uint8_t reg_val;
int ret;
mutex_lock(&data->lock);
ret = adp8860_read(client, reg, ®_val);
if (!ret && ((reg_val & bit_mask) != bit_mask)) {
reg_val |= bit_mask;
ret = adp8860_write(client, reg, reg_val);
}
mutex_unlock(&data->lock);
return ret;
}
static int adp8860_clr_bits(struct i2c_client *client, int reg, uint8_t bit_mask)
{
struct adp8860_bl *data = i2c_get_clientdata(client);
uint8_t reg_val;
int ret;
mutex_lock(&data->lock);
ret = adp8860_read(client, reg, ®_val);
if (!ret && (reg_val & bit_mask)) {
reg_val &= ~bit_mask;
ret = adp8860_write(client, reg, reg_val);
}
mutex_unlock(&data->lock);
return ret;
}
/*
* Independent sink / LED
*/
#if defined(ADP8860_USE_LEDS)
static void adp8860_led_work(struct work_struct *work)
{
struct adp8860_led *led = container_of(work, struct adp8860_led, work);
adp8860_write(led->client, ADP8860_ISC1 - led->id + 1,
led->new_brightness >> 1);
}
static void adp8860_led_set(struct led_classdev *led_cdev,
enum led_brightness value)
{
struct adp8860_led *led;
led = container_of(led_cdev, struct adp8860_led, cdev);
led->new_brightness = value;
schedule_work(&led->work);
}
static int adp8860_led_setup(struct adp8860_led *led)
{
struct i2c_client *client = led->client;
int ret = 0;
ret = adp8860_write(client, ADP8860_ISC1 - led->id + 1, 0);
ret |= adp8860_set_bits(client, ADP8860_ISCC, 1 << (led->id - 1));
if (led->id > 4)
ret |= adp8860_set_bits(client, ADP8860_ISCT1,
(led->flags & 0x3) << ((led->id
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