diff options
Diffstat (limited to 'driver/als_isl29035.c')
-rw-r--r-- | driver/als_isl29035.c | 73 |
1 files changed, 0 insertions, 73 deletions
diff --git a/driver/als_isl29035.c b/driver/als_isl29035.c deleted file mode 100644 index db77a19f09..0000000000 --- a/driver/als_isl29035.c +++ /dev/null @@ -1,73 +0,0 @@ -/* Copyright 2013 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. - * - * Intersil ILS29035 light sensor driver - */ - -#include "driver/als_isl29035.h" -#include "i2c.h" - -/* I2C interface */ -#define ILS29035_I2C_ADDR_FLAGS 0x44 -#define ILS29035_REG_COMMAND_I 0 -#define ILS29035_REG_COMMAND_II 1 -#define ILS29035_REG_DATA_LSB 2 -#define ILS29035_REG_DATA_MSB 3 -#define ILS29035_REG_INT_LT_LSB 4 -#define ILS29035_REG_INT_LT_MSB 5 -#define ILS29035_REG_INT_HT_LSB 6 -#define ILS29035_REG_INT_HT_MSB 7 -#define ILS29035_REG_ID 15 - -int isl29035_init(void) -{ - /* - * Tell it to read continually. This uses 70uA, as opposed to nearly - * zero, but it makes the hook/update code cleaner (we don't want to - * wait 90ms to read on demand while processing hook callbacks). - */ - return i2c_write8(I2C_PORT_ALS, ILS29035_I2C_ADDR_FLAGS, - ILS29035_REG_COMMAND_I, 0xa0); -} - -int isl29035_read_lux(int *lux, int af) -{ - int rv, lsb, msb, data; - - /* - * NOTE: It is necessary to read the LSB first, then the MSB. If you do - * it in the opposite order, the results are not correct. This is - * apparently an undocumented "feature". It's especially noticeable in - * one-shot mode. - */ - - /* Read lsb */ - rv = i2c_read8(I2C_PORT_ALS, ILS29035_I2C_ADDR_FLAGS, - ILS29035_REG_DATA_LSB, &lsb); - if (rv) - return rv; - - /* Read msb */ - rv = i2c_read8(I2C_PORT_ALS, ILS29035_I2C_ADDR_FLAGS, - ILS29035_REG_DATA_MSB, &msb); - if (rv) - return rv; - - data = (msb << 8) | lsb; - - /* - * The default power-on values will give 16 bits of precision: - * 0x0000-0xffff indicates 0-1000 lux. We multiply the sensor value by - * a scaling factor to account for attentuation by glass, tinting, etc. - * - * Caution: Don't go nuts with the attentuation factor. If it's - * greater than 32, the signed int math will roll over and you'll get - * very wrong results. Of course, if you have that much attenuation and - * are still getting useful readings, you probably have your sensor - * pointed directly into the sun. - */ - *lux = data * af * 1000 / 0xffff; - - return EC_SUCCESS; -} |