diff options
| author | Elmo_Lan <elmo_lan@compal.corp-partner.google.com> | 2018-01-23 07:12:46 -0500 |
|---|---|---|
| committer | chrome-bot <chrome-bot@chromium.org> | 2018-03-02 22:22:34 -0800 |
| commit | 6790a884a46f18e858a6b308d3b00f86ef915e3f (patch) | |
| tree | 4bf4cbcfd33118ccba1b66464c5af1d52b5d47df /driver/led | |
| parent | f32d92b7f5aa5e6951133bb7b893d264b1bb70e2 (diff) | |
| download | chrome-ec-6790a884a46f18e858a6b308d3b00f86ef915e3f.tar.gz | |
Nami: add keyboard backlight function
Base on LM3509 chip. Add file LM3509.C and LM3509.H
to control keyboard backlight when S0/LidOpen is turn on,
others is turn off.
BUG=b:73055990
BRANCH=none
TEST=Verify keyboard backlight function in resume and suspend.
S0/LidOpen is turn on; S4/S5/G3/LidClose is turn off.
Change-Id: Ief9e385f969c9dfc9e8f0d4e47ea7803cee747aa
Signed-off-by: Elmo_Lan <elmo_lan@compal.corp-partner.google.com>
Reviewed-on: https://chromium-review.googlesource.com/881081
Commit-Ready: Raymond Chou <raymond_chou@compal.corp-partner.google.com>
Tested-by: Elthan Huang <elthan_huang@compal.corp-partner.google.com>
Reviewed-by: Daisuke Nojiri <dnojiri@chromium.org>
Reviewed-by: Elthan Huang <elthan_huang@compal.corp-partner.google.com>
Diffstat (limited to 'driver/led')
| -rw-r--r-- | driver/led/lm3509.c | 43 | ||||
| -rw-r--r-- | driver/led/lm3509.h | 24 |
2 files changed, 67 insertions, 0 deletions
diff --git a/driver/led/lm3509.c b/driver/led/lm3509.c new file mode 100644 index 0000000000..463627a210 --- /dev/null +++ b/driver/led/lm3509.c @@ -0,0 +1,43 @@ +/* Copyright 2018 The Chromium OS Authors. All rights reserved. + * Use of this source code is governed by a BSD-style license that can be + * found in the LICENSE file. + * + * TI LM3509 LED driver. + */ + +#include "i2c.h" +#include "lm3509.h" + +inline int lm3509_write(uint8_t reg, uint8_t val) +{ + return i2c_write8(I2C_PORT_KBLIGHT, LM3509_I2C_ADDR, reg, val); +} + +int lm3509_poweron(void) +{ + int ret = 0; + + /* BIT= description + * [2]= set both main and seconfary current same, both control by BMAIN. + * [1]= enable secondary current sink. + * [0]= enable main current sink. + */ + ret |= lm3509_write(LM3509_REG_GP, 0x07); + /* Brigntness register + * 0x00= 0% + * 0x1F= 100% + */ + ret |= lm3509_write(LM3509_REG_BMAIN, 0x1F); + + return ret; +} + +int lm3509_poweroff(void) +{ + int ret = 0; + + ret |= lm3509_write(LM3509_REG_GP, 0x00); + ret |= lm3509_write(LM3509_REG_BMAIN, 0x00); + + return ret; +} diff --git a/driver/led/lm3509.h b/driver/led/lm3509.h new file mode 100644 index 0000000000..ca8c67edbf --- /dev/null +++ b/driver/led/lm3509.h @@ -0,0 +1,24 @@ +/* Copyright 2018 The Chromium OS Authors. All rights reserved. + * Use of this source code is governed by a BSD-style license that can be + * found in the LICENSE file. + * + * TI LM3509 LED driver. + */ + +#ifndef __CROS_EC_LM3509_H +#define __CROS_EC_LM3509_H + +/* 8-bit I2C address */ +#define LM3509_I2C_ADDR 0x6C + +#define LM3509_REG_GP 0x10 +#define LM3509_REG_BMAIN 0xA0 +#define LM3509_REG_BSUB 0xB0 + +/* Power on and initialize LM3509. */ +int lm3509_poweron(void); + +/* Power off LM3509. */ +int lm3509_poweroff(void); + +#endif /* __CROS_EC_LM3509_H */ |