diff options
Diffstat (limited to 'board/samus/panel.c')
| -rw-r--r-- | board/samus/panel.c | 195 |
1 files changed, 0 insertions, 195 deletions
diff --git a/board/samus/panel.c b/board/samus/panel.c deleted file mode 100644 index b3fe6060aa..0000000000 --- a/board/samus/panel.c +++ /dev/null @@ -1,195 +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. - */ - -#include "chipset.h" -#include "common.h" -#include "console.h" -#include "gpio.h" -#include "hooks.h" -#include "host_command.h" -#include "i2c.h" -#include "lid_switch.h" -#include "timer.h" - -#define CPRINTS(format, args...) cprints(CC_I2C, format, ## args) - -#define I2C_ADDR_BACKLIGHT_FLAGS (0x2C | I2C_FLAG_BIG_ENDIAN) -#define I2C_RETRIES 3 -#define I2C_RETRY_DELAY (5*MSEC) - -#define LP8555_REG_COMMAND 0x00 -#define LP8555_REG_COMMAND_ON 0x01 -#define LP8555_REG_CONFIG 0x10 -#define LP8555_REG_CONFIG_MODE_MASK 0x03 -#define LP8555_REG_CONFIG_MODE_PWM 0x00 -#define LP8555_REG_CURRENT 0x11 -#define LP8555_REG_CURRENT_MAXCURR_5MA 0x00 -#define LP8555_REG_CURRENT_MAXCURR_10MA 0x01 -#define LP8555_REG_CURRENT_MAXCURR_15MA 0x02 -#define LP8555_REG_CURRENT_MAXCURR_20MA 0x03 -#define LP8555_REG_CURRENT_MAXCURR_23MA 0x04 -#define LP8555_REG_CURRENT_MAXCURR_25MA 0x05 -#define LP8555_REG_CURRENT_MAXCURR_30MA 0x06 -#define LP8555_REG_CURRENT_MAXCURR_50MA 0x07 -#define LP8555_REG_STEP 0x15 -#define LP8555_REG_STEP_STEP_0MS (0 << 0) -#define LP8555_REG_STEP_STEP_8MS BIT(0) -#define LP8555_REG_STEP_STEP_16MS (2 << 0) -#define LP8555_REG_STEP_STEP_24MS (3 << 0) -#define LP8555_REG_STEP_STEP_28MS (4 << 0) -#define LP8555_REG_STEP_STEP_32MS (5 << 0) -#define LP8555_REG_STEP_STEP_100MS (6 << 0) -#define LP8555_REG_STEP_STEP_200MS (7 << 0) -#define LP8555_REG_STEP_PWM_IN_HYST_NONE (0 << 3) -#define LP8555_REG_STEP_PWM_IN_HYST_1LSB BIT(3) -#define LP8555_REG_STEP_PWM_IN_HYST_2LSB (2 << 3) -#define LP8555_REG_STEP_PWM_IN_HYST_4LSB (3 << 3) -#define LP8555_REG_STEP_PWM_IN_HYST_8LSB (4 << 3) -#define LP8555_REG_STEP_PWM_IN_HYST_16LSB (5 << 3) -#define LP8555_REG_STEP_PWM_IN_HYST_32LSB (6 << 3) -#define LP8555_REG_STEP_PWM_IN_HYST_64LSB (7 << 3) -#define LP8555_REG_STEP_SMOOTH_NONE (0 << 6) -#define LP8555_REG_STEP_SMOOTH_LIGHT BIT(6) -#define LP8555_REG_STEP_SMOOTH_MEDIUM (2 << 6) -#define LP8555_REG_STEP_SMOOTH_HEAVY (3 << 6) - -/* Read from lp8555 with automatic i2c retries */ -static int lp8555_read_with_retry(int reg, int *data) -{ - int i, rv; - - for (i = 0; i < I2C_RETRIES; i++) { - rv = i2c_read8(I2C_PORT_BACKLIGHT, - I2C_ADDR_BACKLIGHT_FLAGS, - reg, data); - if (rv == EC_SUCCESS) - return EC_SUCCESS; - usleep(I2C_RETRY_DELAY); - } - - CPRINTS("Backlight read fail: reg 0x%02x", reg); - return rv; -} - -/* Write to lp8555 with automatic i2c retries */ -static int lp8555_write_with_retry(int reg, int data) -{ - int i, rv; - - for (i = 0; i < I2C_RETRIES; i++) { - rv = i2c_write8(I2C_PORT_BACKLIGHT, - I2C_ADDR_BACKLIGHT_FLAGS, - reg, data); - if (rv == EC_SUCCESS) - return EC_SUCCESS; - usleep(I2C_RETRY_DELAY); - } - - CPRINTS("Backlight write fail: reg 0x%02x data %d", reg, data); - return rv; -} - -/** - * Setup backlight controller and turn it on. - */ -static void lp8555_enable_pwm_mode(void) -{ - int reg; - int rv; - - /* - * If not in S0, then PCH backlight enable will not be on, and if - * lid is closed EC backlight enable will not be on. Since these - * two signals are AND'ed together, no point in trying to talk to - * the lp8555 if either one of them is not true. - */ - if (!chipset_in_state(CHIPSET_STATE_ON) || !lid_is_open()) - return; - - /* Enable PWM mode. */ - rv = lp8555_read_with_retry(LP8555_REG_CONFIG, ®); - if (rv != EC_SUCCESS) - return; - reg &= ~LP8555_REG_CONFIG_MODE_MASK; - reg |= LP8555_REG_CONFIG_MODE_PWM; - rv = lp8555_write_with_retry(LP8555_REG_CONFIG, reg); - if (rv != EC_SUCCESS) - return; - - /* Set max LED current to 23mA. */ - rv = lp8555_write_with_retry(LP8555_REG_CURRENT, - LP8555_REG_CURRENT_MAXCURR_23MA); - if (rv != EC_SUCCESS) - return; - - /* Set the rate of brightness change. */ - rv = lp8555_write_with_retry(LP8555_REG_STEP, - LP8555_REG_STEP_STEP_200MS | - LP8555_REG_STEP_PWM_IN_HYST_8LSB | - LP8555_REG_STEP_SMOOTH_HEAVY); - if (rv != EC_SUCCESS) - return; - - /* Power on. */ - rv = lp8555_read_with_retry(LP8555_REG_COMMAND, ®); - if (rv != EC_SUCCESS) - return; - reg |= LP8555_REG_COMMAND_ON; - rv = lp8555_write_with_retry(LP8555_REG_COMMAND, reg); -} -DECLARE_DEFERRED(lp8555_enable_pwm_mode); - -/** - * Host command to toggle backlight. - */ -static enum ec_status -switch_command_enable_backlight(struct host_cmd_handler_args *args) -{ - const struct ec_params_switch_enable_backlight *p = args->params; - - gpio_set_level(GPIO_ENABLE_BACKLIGHT, p->enabled); - - if (p->enabled) - lp8555_enable_pwm_mode(); - - return EC_RES_SUCCESS; -} -DECLARE_HOST_COMMAND(EC_CMD_SWITCH_ENABLE_BKLIGHT, - switch_command_enable_backlight, - EC_VER_MASK(0)); - -void backlight_interrupt(enum gpio_signal signal) -{ - /* - * PCH indicates it is turning on backlight so we should - * attempt to put the backlight controller into PWM mode. - */ - hook_call_deferred(&lp8555_enable_pwm_mode_data, 0); -} - -/** - * Update backlight state. - */ -static void update_backlight(void) -{ - /* - * Enable backlight if lid is open; this is AND'd with the request from - * the AP in hardware. - */ - gpio_set_level(GPIO_ENABLE_BACKLIGHT, lid_is_open()); - if (lid_is_open()) - hook_call_deferred(&lp8555_enable_pwm_mode_data, 0); -} -DECLARE_HOOK(HOOK_LID_CHANGE, update_backlight, HOOK_PRIO_DEFAULT); - -/** - * Initialize backlight module. - */ -static void backlight_init(void) -{ - gpio_enable_interrupt(GPIO_PCH_BL_EN); - gpio_set_level(GPIO_ENABLE_BACKLIGHT, lid_is_open()); -} -DECLARE_HOOK(HOOK_INIT, backlight_init, HOOK_PRIO_DEFAULT); |