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![Paul Gortmaker](/assets/img/avatar_default.png)
None of these files are actually using any __init type directives and hence don't need to include <linux/init.h>. Most are just a left over from __devinit and __cpuinit removal, or simply due to code getting copied from one driver to the next. Cc: Bryan Wu <cooloney@gmail.com> Cc: Richard Purdie <rpurdie@rpsys.net> Cc: linux-leds@vger.kernel.org Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by: Bryan Wu <cooloney@gmail.com>
617 lines
16 KiB
C
617 lines
16 KiB
C
/*
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* LP5521 LED chip driver.
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*
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* Copyright (C) 2010 Nokia Corporation
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* Copyright (C) 2012 Texas Instruments
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*
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* Contact: Samu Onkalo <samu.p.onkalo@nokia.com>
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* Milo(Woogyom) Kim <milo.kim@ti.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*/
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#include <linux/delay.h>
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#include <linux/firmware.h>
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#include <linux/i2c.h>
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#include <linux/leds.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/platform_data/leds-lp55xx.h>
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#include <linux/slab.h>
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#include <linux/of.h>
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#include "leds-lp55xx-common.h"
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#define LP5521_PROGRAM_LENGTH 32
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#define LP5521_MAX_LEDS 3
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#define LP5521_CMD_DIRECT 0x3F
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/* Registers */
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#define LP5521_REG_ENABLE 0x00
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#define LP5521_REG_OP_MODE 0x01
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#define LP5521_REG_R_PWM 0x02
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#define LP5521_REG_G_PWM 0x03
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#define LP5521_REG_B_PWM 0x04
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#define LP5521_REG_R_CURRENT 0x05
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#define LP5521_REG_G_CURRENT 0x06
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#define LP5521_REG_B_CURRENT 0x07
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#define LP5521_REG_CONFIG 0x08
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#define LP5521_REG_STATUS 0x0C
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#define LP5521_REG_RESET 0x0D
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#define LP5521_REG_R_PROG_MEM 0x10
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#define LP5521_REG_G_PROG_MEM 0x30
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#define LP5521_REG_B_PROG_MEM 0x50
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/* Base register to set LED current */
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#define LP5521_REG_LED_CURRENT_BASE LP5521_REG_R_CURRENT
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/* Base register to set the brightness */
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#define LP5521_REG_LED_PWM_BASE LP5521_REG_R_PWM
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/* Bits in ENABLE register */
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#define LP5521_MASTER_ENABLE 0x40 /* Chip master enable */
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#define LP5521_LOGARITHMIC_PWM 0x80 /* Logarithmic PWM adjustment */
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#define LP5521_EXEC_RUN 0x2A
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#define LP5521_ENABLE_DEFAULT \
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(LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM)
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#define LP5521_ENABLE_RUN_PROGRAM \
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(LP5521_ENABLE_DEFAULT | LP5521_EXEC_RUN)
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/* CONFIG register */
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#define LP5521_PWM_HF 0x40 /* PWM: 0 = 256Hz, 1 = 558Hz */
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#define LP5521_PWRSAVE_EN 0x20 /* 1 = Power save mode */
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#define LP5521_CP_MODE_OFF 0 /* Charge pump (CP) off */
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#define LP5521_CP_MODE_BYPASS 8 /* CP forced to bypass mode */
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#define LP5521_CP_MODE_1X5 0x10 /* CP forced to 1.5x mode */
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#define LP5521_CP_MODE_AUTO 0x18 /* Automatic mode selection */
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#define LP5521_R_TO_BATT 0x04 /* R out: 0 = CP, 1 = Vbat */
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#define LP5521_CLK_INT 0x01 /* Internal clock */
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#define LP5521_DEFAULT_CFG \
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(LP5521_PWM_HF | LP5521_PWRSAVE_EN | LP5521_CP_MODE_AUTO)
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/* Status */
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#define LP5521_EXT_CLK_USED 0x08
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/* default R channel current register value */
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#define LP5521_REG_R_CURR_DEFAULT 0xAF
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/* Reset register value */
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#define LP5521_RESET 0xFF
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/* Program Memory Operations */
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#define LP5521_MODE_R_M 0x30 /* Operation Mode Register */
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#define LP5521_MODE_G_M 0x0C
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#define LP5521_MODE_B_M 0x03
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#define LP5521_LOAD_R 0x10
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#define LP5521_LOAD_G 0x04
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#define LP5521_LOAD_B 0x01
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#define LP5521_R_IS_LOADING(mode) \
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((mode & LP5521_MODE_R_M) == LP5521_LOAD_R)
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#define LP5521_G_IS_LOADING(mode) \
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((mode & LP5521_MODE_G_M) == LP5521_LOAD_G)
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#define LP5521_B_IS_LOADING(mode) \
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((mode & LP5521_MODE_B_M) == LP5521_LOAD_B)
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#define LP5521_EXEC_R_M 0x30 /* Enable Register */
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#define LP5521_EXEC_G_M 0x0C
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#define LP5521_EXEC_B_M 0x03
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#define LP5521_EXEC_M 0x3F
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#define LP5521_RUN_R 0x20
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#define LP5521_RUN_G 0x08
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#define LP5521_RUN_B 0x02
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static inline void lp5521_wait_opmode_done(void)
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{
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/* operation mode change needs to be longer than 153 us */
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usleep_range(200, 300);
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}
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static inline void lp5521_wait_enable_done(void)
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{
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/* it takes more 488 us to update ENABLE register */
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usleep_range(500, 600);
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}
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static void lp5521_set_led_current(struct lp55xx_led *led, u8 led_current)
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{
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led->led_current = led_current;
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lp55xx_write(led->chip, LP5521_REG_LED_CURRENT_BASE + led->chan_nr,
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led_current);
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}
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static void lp5521_load_engine(struct lp55xx_chip *chip)
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{
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enum lp55xx_engine_index idx = chip->engine_idx;
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u8 mask[] = {
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[LP55XX_ENGINE_1] = LP5521_MODE_R_M,
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[LP55XX_ENGINE_2] = LP5521_MODE_G_M,
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[LP55XX_ENGINE_3] = LP5521_MODE_B_M,
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};
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u8 val[] = {
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[LP55XX_ENGINE_1] = LP5521_LOAD_R,
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[LP55XX_ENGINE_2] = LP5521_LOAD_G,
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[LP55XX_ENGINE_3] = LP5521_LOAD_B,
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};
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lp55xx_update_bits(chip, LP5521_REG_OP_MODE, mask[idx], val[idx]);
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lp5521_wait_opmode_done();
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}
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static void lp5521_stop_all_engines(struct lp55xx_chip *chip)
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{
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lp55xx_write(chip, LP5521_REG_OP_MODE, 0);
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lp5521_wait_opmode_done();
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}
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static void lp5521_stop_engine(struct lp55xx_chip *chip)
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{
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enum lp55xx_engine_index idx = chip->engine_idx;
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u8 mask[] = {
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[LP55XX_ENGINE_1] = LP5521_MODE_R_M,
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[LP55XX_ENGINE_2] = LP5521_MODE_G_M,
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[LP55XX_ENGINE_3] = LP5521_MODE_B_M,
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};
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lp55xx_update_bits(chip, LP5521_REG_OP_MODE, mask[idx], 0);
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lp5521_wait_opmode_done();
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}
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static void lp5521_run_engine(struct lp55xx_chip *chip, bool start)
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{
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int ret;
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u8 mode;
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u8 exec;
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/* stop engine */
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if (!start) {
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lp5521_stop_engine(chip);
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lp55xx_write(chip, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
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lp5521_wait_opmode_done();
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return;
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}
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/*
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* To run the engine,
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* operation mode and enable register should updated at the same time
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*/
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ret = lp55xx_read(chip, LP5521_REG_OP_MODE, &mode);
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if (ret)
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return;
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ret = lp55xx_read(chip, LP5521_REG_ENABLE, &exec);
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if (ret)
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return;
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/* change operation mode to RUN only when each engine is loading */
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if (LP5521_R_IS_LOADING(mode)) {
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mode = (mode & ~LP5521_MODE_R_M) | LP5521_RUN_R;
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exec = (exec & ~LP5521_EXEC_R_M) | LP5521_RUN_R;
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}
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if (LP5521_G_IS_LOADING(mode)) {
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mode = (mode & ~LP5521_MODE_G_M) | LP5521_RUN_G;
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exec = (exec & ~LP5521_EXEC_G_M) | LP5521_RUN_G;
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}
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if (LP5521_B_IS_LOADING(mode)) {
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mode = (mode & ~LP5521_MODE_B_M) | LP5521_RUN_B;
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exec = (exec & ~LP5521_EXEC_B_M) | LP5521_RUN_B;
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}
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lp55xx_write(chip, LP5521_REG_OP_MODE, mode);
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lp5521_wait_opmode_done();
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lp55xx_update_bits(chip, LP5521_REG_ENABLE, LP5521_EXEC_M, exec);
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lp5521_wait_enable_done();
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}
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static int lp5521_update_program_memory(struct lp55xx_chip *chip,
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const u8 *data, size_t size)
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{
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enum lp55xx_engine_index idx = chip->engine_idx;
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u8 pattern[LP5521_PROGRAM_LENGTH] = {0};
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u8 addr[] = {
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[LP55XX_ENGINE_1] = LP5521_REG_R_PROG_MEM,
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[LP55XX_ENGINE_2] = LP5521_REG_G_PROG_MEM,
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[LP55XX_ENGINE_3] = LP5521_REG_B_PROG_MEM,
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};
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unsigned cmd;
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char c[3];
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int nrchars;
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int ret;
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int offset = 0;
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int i = 0;
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while ((offset < size - 1) && (i < LP5521_PROGRAM_LENGTH)) {
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/* separate sscanfs because length is working only for %s */
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ret = sscanf(data + offset, "%2s%n ", c, &nrchars);
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if (ret != 1)
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goto err;
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ret = sscanf(c, "%2x", &cmd);
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if (ret != 1)
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goto err;
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pattern[i] = (u8)cmd;
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offset += nrchars;
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i++;
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}
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/* Each instruction is 16bit long. Check that length is even */
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if (i % 2)
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goto err;
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for (i = 0; i < LP5521_PROGRAM_LENGTH; i++) {
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ret = lp55xx_write(chip, addr[idx] + i, pattern[i]);
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if (ret)
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return -EINVAL;
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}
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return size;
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err:
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dev_err(&chip->cl->dev, "wrong pattern format\n");
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return -EINVAL;
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}
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static void lp5521_firmware_loaded(struct lp55xx_chip *chip)
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{
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const struct firmware *fw = chip->fw;
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if (fw->size > LP5521_PROGRAM_LENGTH) {
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dev_err(&chip->cl->dev, "firmware data size overflow: %zu\n",
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fw->size);
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return;
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}
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/*
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* Program momery sequence
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* 1) set engine mode to "LOAD"
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* 2) write firmware data into program memory
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*/
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lp5521_load_engine(chip);
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lp5521_update_program_memory(chip, fw->data, fw->size);
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}
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static int lp5521_post_init_device(struct lp55xx_chip *chip)
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{
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int ret;
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u8 val;
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/*
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* Make sure that the chip is reset by reading back the r channel
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* current reg. This is dummy read is required on some platforms -
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* otherwise further access to the R G B channels in the
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* LP5521_REG_ENABLE register will not have any effect - strange!
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*/
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ret = lp55xx_read(chip, LP5521_REG_R_CURRENT, &val);
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if (ret) {
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dev_err(&chip->cl->dev, "error in resetting chip\n");
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return ret;
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}
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if (val != LP5521_REG_R_CURR_DEFAULT) {
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dev_err(&chip->cl->dev,
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"unexpected data in register (expected 0x%x got 0x%x)\n",
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LP5521_REG_R_CURR_DEFAULT, val);
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ret = -EINVAL;
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return ret;
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}
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usleep_range(10000, 20000);
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/* Set all PWMs to direct control mode */
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ret = lp55xx_write(chip, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
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/* Update configuration for the clock setting */
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val = LP5521_DEFAULT_CFG;
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if (!lp55xx_is_extclk_used(chip))
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val |= LP5521_CLK_INT;
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ret = lp55xx_write(chip, LP5521_REG_CONFIG, val);
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if (ret)
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return ret;
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/* Initialize all channels PWM to zero -> leds off */
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lp55xx_write(chip, LP5521_REG_R_PWM, 0);
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lp55xx_write(chip, LP5521_REG_G_PWM, 0);
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lp55xx_write(chip, LP5521_REG_B_PWM, 0);
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/* Set engines are set to run state when OP_MODE enables engines */
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ret = lp55xx_write(chip, LP5521_REG_ENABLE, LP5521_ENABLE_RUN_PROGRAM);
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if (ret)
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return ret;
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lp5521_wait_enable_done();
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return 0;
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}
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static int lp5521_run_selftest(struct lp55xx_chip *chip, char *buf)
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{
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struct lp55xx_platform_data *pdata = chip->pdata;
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int ret;
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u8 status;
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ret = lp55xx_read(chip, LP5521_REG_STATUS, &status);
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if (ret < 0)
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return ret;
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if (pdata->clock_mode != LP55XX_CLOCK_EXT)
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return 0;
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/* Check that ext clock is really in use if requested */
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if ((status & LP5521_EXT_CLK_USED) == 0)
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return -EIO;
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return 0;
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}
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static void lp5521_led_brightness_work(struct work_struct *work)
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{
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struct lp55xx_led *led = container_of(work, struct lp55xx_led,
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brightness_work);
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struct lp55xx_chip *chip = led->chip;
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mutex_lock(&chip->lock);
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lp55xx_write(chip, LP5521_REG_LED_PWM_BASE + led->chan_nr,
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led->brightness);
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mutex_unlock(&chip->lock);
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}
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static ssize_t show_engine_mode(struct device *dev,
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struct device_attribute *attr,
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char *buf, int nr)
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{
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struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
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struct lp55xx_chip *chip = led->chip;
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enum lp55xx_engine_mode mode = chip->engines[nr - 1].mode;
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switch (mode) {
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case LP55XX_ENGINE_RUN:
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return sprintf(buf, "run\n");
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case LP55XX_ENGINE_LOAD:
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return sprintf(buf, "load\n");
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case LP55XX_ENGINE_DISABLED:
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default:
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return sprintf(buf, "disabled\n");
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}
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}
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show_mode(1)
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show_mode(2)
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show_mode(3)
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static ssize_t store_engine_mode(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t len, int nr)
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{
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struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
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struct lp55xx_chip *chip = led->chip;
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struct lp55xx_engine *engine = &chip->engines[nr - 1];
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mutex_lock(&chip->lock);
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chip->engine_idx = nr;
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if (!strncmp(buf, "run", 3)) {
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lp5521_run_engine(chip, true);
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engine->mode = LP55XX_ENGINE_RUN;
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} else if (!strncmp(buf, "load", 4)) {
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lp5521_stop_engine(chip);
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lp5521_load_engine(chip);
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engine->mode = LP55XX_ENGINE_LOAD;
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} else if (!strncmp(buf, "disabled", 8)) {
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lp5521_stop_engine(chip);
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engine->mode = LP55XX_ENGINE_DISABLED;
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}
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mutex_unlock(&chip->lock);
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return len;
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}
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store_mode(1)
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store_mode(2)
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store_mode(3)
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static ssize_t store_engine_load(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t len, int nr)
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{
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struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
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struct lp55xx_chip *chip = led->chip;
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int ret;
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mutex_lock(&chip->lock);
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chip->engine_idx = nr;
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lp5521_load_engine(chip);
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ret = lp5521_update_program_memory(chip, buf, len);
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mutex_unlock(&chip->lock);
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return ret;
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}
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store_load(1)
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store_load(2)
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store_load(3)
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static ssize_t lp5521_selftest(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
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struct lp55xx_chip *chip = led->chip;
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int ret;
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mutex_lock(&chip->lock);
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ret = lp5521_run_selftest(chip, buf);
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mutex_unlock(&chip->lock);
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return scnprintf(buf, PAGE_SIZE, "%s\n", ret ? "FAIL" : "OK");
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}
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/* device attributes */
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static LP55XX_DEV_ATTR_RW(engine1_mode, show_engine1_mode, store_engine1_mode);
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static LP55XX_DEV_ATTR_RW(engine2_mode, show_engine2_mode, store_engine2_mode);
|
|
static LP55XX_DEV_ATTR_RW(engine3_mode, show_engine3_mode, store_engine3_mode);
|
|
static LP55XX_DEV_ATTR_WO(engine1_load, store_engine1_load);
|
|
static LP55XX_DEV_ATTR_WO(engine2_load, store_engine2_load);
|
|
static LP55XX_DEV_ATTR_WO(engine3_load, store_engine3_load);
|
|
static LP55XX_DEV_ATTR_RO(selftest, lp5521_selftest);
|
|
|
|
static struct attribute *lp5521_attributes[] = {
|
|
&dev_attr_engine1_mode.attr,
|
|
&dev_attr_engine2_mode.attr,
|
|
&dev_attr_engine3_mode.attr,
|
|
&dev_attr_engine1_load.attr,
|
|
&dev_attr_engine2_load.attr,
|
|
&dev_attr_engine3_load.attr,
|
|
&dev_attr_selftest.attr,
|
|
NULL
|
|
};
|
|
|
|
static const struct attribute_group lp5521_group = {
|
|
.attrs = lp5521_attributes,
|
|
};
|
|
|
|
/* Chip specific configurations */
|
|
static struct lp55xx_device_config lp5521_cfg = {
|
|
.reset = {
|
|
.addr = LP5521_REG_RESET,
|
|
.val = LP5521_RESET,
|
|
},
|
|
.enable = {
|
|
.addr = LP5521_REG_ENABLE,
|
|
.val = LP5521_ENABLE_DEFAULT,
|
|
},
|
|
.max_channel = LP5521_MAX_LEDS,
|
|
.post_init_device = lp5521_post_init_device,
|
|
.brightness_work_fn = lp5521_led_brightness_work,
|
|
.set_led_current = lp5521_set_led_current,
|
|
.firmware_cb = lp5521_firmware_loaded,
|
|
.run_engine = lp5521_run_engine,
|
|
.dev_attr_group = &lp5521_group,
|
|
};
|
|
|
|
static int lp5521_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
int ret;
|
|
struct lp55xx_chip *chip;
|
|
struct lp55xx_led *led;
|
|
struct lp55xx_platform_data *pdata;
|
|
struct device_node *np = client->dev.of_node;
|
|
|
|
if (!dev_get_platdata(&client->dev)) {
|
|
if (np) {
|
|
ret = lp55xx_of_populate_pdata(&client->dev, np);
|
|
if (ret < 0)
|
|
return ret;
|
|
} else {
|
|
dev_err(&client->dev, "no platform data\n");
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
pdata = dev_get_platdata(&client->dev);
|
|
|
|
chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
|
|
if (!chip)
|
|
return -ENOMEM;
|
|
|
|
led = devm_kzalloc(&client->dev,
|
|
sizeof(*led) * pdata->num_channels, GFP_KERNEL);
|
|
if (!led)
|
|
return -ENOMEM;
|
|
|
|
chip->cl = client;
|
|
chip->pdata = pdata;
|
|
chip->cfg = &lp5521_cfg;
|
|
|
|
mutex_init(&chip->lock);
|
|
|
|
i2c_set_clientdata(client, led);
|
|
|
|
ret = lp55xx_init_device(chip);
|
|
if (ret)
|
|
goto err_init;
|
|
|
|
dev_info(&client->dev, "%s programmable led chip found\n", id->name);
|
|
|
|
ret = lp55xx_register_leds(led, chip);
|
|
if (ret)
|
|
goto err_register_leds;
|
|
|
|
ret = lp55xx_register_sysfs(chip);
|
|
if (ret) {
|
|
dev_err(&client->dev, "registering sysfs failed\n");
|
|
goto err_register_sysfs;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_register_sysfs:
|
|
lp55xx_unregister_leds(led, chip);
|
|
err_register_leds:
|
|
lp55xx_deinit_device(chip);
|
|
err_init:
|
|
return ret;
|
|
}
|
|
|
|
static int lp5521_remove(struct i2c_client *client)
|
|
{
|
|
struct lp55xx_led *led = i2c_get_clientdata(client);
|
|
struct lp55xx_chip *chip = led->chip;
|
|
|
|
lp5521_stop_all_engines(chip);
|
|
lp55xx_unregister_sysfs(chip);
|
|
lp55xx_unregister_leds(led, chip);
|
|
lp55xx_deinit_device(chip);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct i2c_device_id lp5521_id[] = {
|
|
{ "lp5521", 0 }, /* Three channel chip */
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, lp5521_id);
|
|
|
|
#ifdef CONFIG_OF
|
|
static const struct of_device_id of_lp5521_leds_match[] = {
|
|
{ .compatible = "national,lp5521", },
|
|
{},
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(of, of_lp5521_leds_match);
|
|
#endif
|
|
static struct i2c_driver lp5521_driver = {
|
|
.driver = {
|
|
.name = "lp5521",
|
|
.of_match_table = of_match_ptr(of_lp5521_leds_match),
|
|
},
|
|
.probe = lp5521_probe,
|
|
.remove = lp5521_remove,
|
|
.id_table = lp5521_id,
|
|
};
|
|
|
|
module_i2c_driver(lp5521_driver);
|
|
|
|
MODULE_AUTHOR("Mathias Nyman, Yuri Zaporozhets, Samu Onkalo");
|
|
MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
|
|
MODULE_DESCRIPTION("LP5521 LED engine");
|
|
MODULE_LICENSE("GPL v2");
|