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Date: Wed, 26 May 2010 03:00:59 -0400
From: Mike Frysinger <vapier@...too.org>
To: linux-kernel@...r.kernel.org, Richard Purdie <rpurdie@...ys.net>
Cc: uclinux-dist-devel@...ckfin.uclinux.org,
Michael Hennerich <michael.hennerich@...log.com>
Subject: [PATCH] backlight: adp8860: add support for ADP8861 & ADP8863
From: Michael Hennerich <michael.hennerich@...log.com>
Signed-off-by: Michael Hennerich <michael.hennerich@...log.com>
Signed-off-by: Mike Frysinger <vapier@...too.org>
---
drivers/video/backlight/Kconfig | 6 ++--
drivers/video/backlight/adp8860_bl.c | 58 ++++++++++++++++++++++++----------
include/linux/i2c/adp8860.h | 17 ++++++++++
3 files changed, 61 insertions(+), 20 deletions(-)
diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
index 7bad1d5..2f21cad 100644
--- a/drivers/video/backlight/Kconfig
+++ b/drivers/video/backlight/Kconfig
@@ -277,13 +277,13 @@ config BACKLIGHT_ADP5520
be called adp5520_bl.
config BACKLIGHT_ADP8860
- tristate "Backlight Driver for ADP8860 using WLED"
+ tristate "Backlight Driver for ADP8860/ADP8861/ADP8863 using WLED"
depends on BACKLIGHT_CLASS_DEVICE && I2C
select NEW_LEDS
select LEDS_CLASS
help
- If you have a LCD backlight connected to the ADP8860,
- say Y here to enable this driver.
+ If you have a LCD backlight connected to the ADP8860, ADP8861 or
+ ADP8863 say Y here to enable this driver.
To compile this driver as a module, choose M here: the module will
be called adp8860_bl.
diff --git a/drivers/video/backlight/adp8860_bl.c b/drivers/video/backlight/adp8860_bl.c
index 9ab0af8..ae23cc0 100644
--- a/drivers/video/backlight/adp8860_bl.c
+++ b/drivers/video/backlight/adp8860_bl.c
@@ -62,7 +62,9 @@
#define ADP8860_PH2LEVH 0x24 /* Second phototransistor ambient light level-high byte register */
#define ADP8860_MANUFID 0x0 /* Analog Devices ADP8860 Manufacturer ID */
-#define ADP8860_DEVICEID 0x7 /* Analog Devices ADP8860 Device 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)
@@ -70,6 +72,7 @@
#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)
@@ -86,6 +89,12 @@
#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;
@@ -105,6 +114,8 @@ struct adp8860_bl {
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)
@@ -121,7 +132,6 @@ static int adp8860_read(struct i2c_client *client, int reg, uint8_t *val)
return 0;
}
-
static int adp8860_write(struct i2c_client *client, u8 reg, u8 val)
{
return i2c_smbus_write_byte_data(client, reg, val);
@@ -321,7 +331,7 @@ static int adp8860_bl_set(struct backlight_device *bl, int brightness)
struct i2c_client *client = data->client;
int ret = 0;
- if (data->pdata->en_ambl_sens) {
+ if (data->en_ambl_sens) {
if ((brightness > 0) && (brightness < ADP8860_MAX_BRIGHTNESS)) {
/* Disable Ambient Light auto adjust */
ret |= adp8860_clr_bits(client, ADP8860_MDCR,
@@ -388,7 +398,7 @@ static int adp8860_bl_setup(struct backlight_device *bl)
ret |= adp8860_write(client, ADP8860_BLMX1, pdata->l1_daylight_max);
ret |= adp8860_write(client, ADP8860_BLDM1, pdata->l1_daylight_dim);
- if (pdata->en_ambl_sens) {
+ if (data->en_ambl_sens) {
data->cached_daylight_max = pdata->l1_daylight_max;
ret |= adp8860_write(client, ADP8860_BLMX2,
pdata->l2_office_max);
@@ -413,7 +423,8 @@ static int adp8860_bl_setup(struct backlight_device *bl)
ret |= adp8860_write(client, ADP8860_BLFR, FADE_VAL(pdata->bl_fade_in,
pdata->bl_fade_out));
- ret |= adp8860_set_bits(client, ADP8860_MDCR, BLEN | DIM_EN | NSTBY);
+ ret |= adp8860_set_bits(client, ADP8860_MDCR, BLEN | DIM_EN | NSTBY |
+ (data->gdwn_dis ? GDWN_DIS : 0));
return ret;
}
@@ -663,19 +674,29 @@ static int __devinit adp8860_probe(struct i2c_client *client,
return -EINVAL;
}
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (data == NULL)
+ return -ENOMEM;
+
ret = adp8860_read(client, ADP8860_MFDVID, ®_val);
if (ret < 0)
- return -EIO;
+ goto out2;
- if (ADP8860_MANID(reg_val) != ADP8860_MANUFID) {
+ switch (ADP8860_MANID(reg_val)) {
+ case ADP8863_MANUFID:
+ data->gdwn_dis = !!pdata->gdwn_dis;
+ case ADP8860_MANUFID:
+ data->en_ambl_sens = !!pdata->en_ambl_sens;
+ break;
+ case ADP8861_MANUFID:
+ data->gdwn_dis = !!pdata->gdwn_dis;
+ break;
+ default:
dev_err(&client->dev, "failed to probe\n");
- return -ENODEV;
+ ret = -ENODEV;
+ goto out2;
}
- data = kzalloc(sizeof(*data), GFP_KERNEL);
- if (data == NULL)
- return -ENOMEM;
-
/* It's confirmed that the DEVID field is actually a REVID */
data->revid = ADP8860_DEVID(reg_val);
@@ -699,7 +720,7 @@ static int __devinit adp8860_probe(struct i2c_client *client,
data->bl = bl;
- if (pdata->en_ambl_sens)
+ if (data->en_ambl_sens)
ret = sysfs_create_group(&bl->dev.kobj,
&adp8860_bl_attr_group);
@@ -716,7 +737,8 @@ static int __devinit adp8860_probe(struct i2c_client *client,
backlight_update_status(bl);
- dev_info(&client->dev, "Rev.%d Backlight\n", data->revid);
+ dev_info(&client->dev, "%s Rev.%d Backlight\n",
+ client->name, data->revid);
if (pdata->num_leds)
adp8860_led_probe(client);
@@ -724,7 +746,7 @@ static int __devinit adp8860_probe(struct i2c_client *client,
return 0;
out:
- if (data->pdata->en_ambl_sens)
+ if (data->en_ambl_sens)
sysfs_remove_group(&data->bl->dev.kobj,
&adp8860_bl_attr_group);
out1:
@@ -745,7 +767,7 @@ static int __devexit adp8860_remove(struct i2c_client *client)
if (data->led)
adp8860_led_remove(client);
- if (data->pdata->en_ambl_sens)
+ if (data->en_ambl_sens)
sysfs_remove_group(&data->bl->dev.kobj,
&adp8860_bl_attr_group);
@@ -776,7 +798,9 @@ static int adp8860_i2c_resume(struct i2c_client *client)
#endif
static const struct i2c_device_id adp8860_id[] = {
- { "adp8860", 0 },
+ { "adp8860", adp8860 },
+ { "adp8861", adp8861 },
+ { "adp8863", adp8863 },
{ }
};
MODULE_DEVICE_TABLE(i2c, adp8860_id);
diff --git a/include/linux/i2c/adp8860.h b/include/linux/i2c/adp8860.h
index 115514b..0b4d398 100644
--- a/include/linux/i2c/adp8860.h
+++ b/include/linux/i2c/adp8860.h
@@ -132,6 +132,23 @@ struct adp8860_backlight_platform_data {
u8 led_fade_out; /* LED Fade-Out Timer */
u8 led_fade_law; /* fade-on/fade-off transfer characteristic */
u8 led_on_time;
+
+ /**
+ * Gain down disable. Setting this option does not allow the
+ * charge pump to switch to lower gains. NOT AVAILABLE on ADP8860
+ * 1 = the charge pump doesn't switch down in gain until all LEDs are 0.
+ * The charge pump switches up in gain as needed. This feature is
+ * useful if the ADP8863 charge pump is used to drive an external load.
+ * This feature must be used when utilizing small fly capacitors
+ * (0402 or smaller).
+ * 0 = the charge pump automatically switches up and down in gain.
+ * This provides optimal efficiency, but is not suitable for driving
+ * loads that are not connected through the ADP8863 diode drivers.
+ * Additionally, the charge pump fly capacitors should be low ESR
+ * and sized 0603 or greater.
+ */
+
+ u8 gdwn_dis;
};
#endif /* __LINUX_I2C_ADP8860_H */
--
1.7.1
--
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