Re: [PATCH 1/2] leds: add new LP5562 LED driver

From: Bryan Wu
Date: Tue Mar 12 2013 - 13:31:34 EST

On Mon, Feb 18, 2013 at 9:10 PM, Kim, Milo <Milo.Kim@xxxxxx> wrote:
> LP5562 can drive up to 4 channels, RGB and White.
> LEDs can be controlled directly via the led class control interface.
>
> LP55xx common driver
> LP5562 is one of LP55xx family device, so LP55xx common code are used.
> On the other hand, chip specific configuration is defined in the structure
> 'lp55xx_device_config'
>
> LED pattern data
> LP5562 has also internal program memory which is used for running various LED
> patterns. LP5562 driver supports the firmware interface and the predefined
> pattern data as well.
>
> LP5562 device attributes: 'led_pattern' and 'engine_mux'
> A 'led_pattern' is an index code which runs the predefined pattern data.
> And 'engine_mux' is updated with the firmware interface is activated.
> Detailed description has been updated in the documentation files,
> 'leds-lp55xx.txt' and 'leds-lp5562.txt'.
>
> Changes on the header file
> LP5562 configurable definitions are added.
> Pattern RGB data is fixed as constant value.
> (No side effect on other devices, LP5521 or LP5523.)
>
> Signed-off-by: Milo(Woogyom) Kim <milo.kim@xxxxxx>

Sorry for the delay. I'm busy in company work.
These 2 patches looks fine with me.
But I think we can fold this 2 patches into one.
Do you mind I doing this and merge to my for-next?

Thanks,
-Bryan

> ---
> Documentation/leds/00-INDEX | 2 +
> Documentation/leds/leds-lp5562.txt | 135 +++++++
> Documentation/leds/leds-lp55xx.txt | 46 ++-
> drivers/leds/Kconfig | 14 +-
> drivers/leds/Makefile | 1 +
> drivers/leds/leds-lp5562.c | 594 +++++++++++++++++++++++++++++
> include/linux/platform_data/leds-lp55xx.h | 13 +-
> 7 files changed, 799 insertions(+), 6 deletions(-)
> create mode 100644 Documentation/leds/leds-lp5562.txt
> create mode 100644 drivers/leds/leds-lp5562.c
>
> diff --git a/Documentation/leds/00-INDEX b/Documentation/leds/00-INDEX
> index 5246090..1ecd159 100644
> --- a/Documentation/leds/00-INDEX
> +++ b/Documentation/leds/00-INDEX
> @@ -6,6 +6,8 @@ leds-lp5521.txt
> - notes on how to use the leds-lp5521 driver.
> leds-lp5523.txt
> - notes on how to use the leds-lp5523 driver.
> +leds-lp5562.txt
> + - notes on how to use the leds-lp5562 driver.
> leds-lp55xx.txt
> - description about lp55xx common driver.
> leds-lm3556.txt
> diff --git a/Documentation/leds/leds-lp5562.txt b/Documentation/leds/leds-lp5562.txt
> new file mode 100644
> index 0000000..9606100
> --- /dev/null
> +++ b/Documentation/leds/leds-lp5562.txt
> @@ -0,0 +1,135 @@
> +Kernel driver for LP5562
> +========================
> +
> +* TI LP5562 LED Driver
> +
> +Author: Milo(Woogyom) Kim <milo.kim@xxxxxx>
> +
> +Description
> +
> + LP5562 can drive up to 4 channels. R/G/B and White.
> + LEDs can be controlled directly via the led class control interface.
> +
> + All four channels can be also controlled using the engine micro programs.
> + LP5562 has the internal program memory for running various LED patterns.
> + For the details, please refer to 'firmware' section in leds-lp55xx.txt
> +
> +Device attribute: engine_mux
> +
> + 3 Engines are allocated in LP5562, but the number of channel is 4.
> + Therefore each channel should be mapped to the engine number.
> + Value : RGB or W
> +
> + This attribute is used for programming LED data with the firmware interface.
> + Unlike the LP5521/LP5523/55231, LP5562 has unique feature for the engine mux,
> + so additional sysfs is required.
> +
> + LED Map
> + Red ... Engine 1 (fixed)
> + Green ... Engine 2 (fixed)
> + Blue ... Engine 3 (fixed)
> + White ... Engine 1 or 2 or 3 (selective)
> +
> +How to load the program data using engine_mux
> +
> + Before loading the LP5562 program data, engine_mux should be written between
> + the engine selection and loading the firmware.
> + Engine mux has two different mode, RGB and W.
> + RGB is used for loading RGB program data, W is used for W program data.
> +
> + For example, run blinking green channel pattern,
> + echo 2 > /sys/bus/i2c/devices/xxxx/select_engine # 2 is for green channel
> + echo "RGB" > /sys/bus/i2c/devices/xxxx/engine_mux # engine mux for RGB
> + echo 1 > /sys/class/firmware/lp5562/loading
> + echo "4000600040FF6000" > /sys/class/firmware/lp5562/data
> + echo 0 > /sys/class/firmware/lp5562/loading
> + echo 1 > /sys/bus/i2c/devices/xxxx/run_engine
> +
> + To run a blinking white pattern,
> + echo 1 or 2 or 3 > /sys/bus/i2c/devices/xxxx/select_engine
> + echo "W" > /sys/bus/i2c/devices/xxxx/engine_mux
> + echo 1 > /sys/class/firmware/lp5562/loading
> + echo "4000600040FF6000" > /sys/class/firmware/lp5562/data
> + echo 0 > /sys/class/firmware/lp5562/loading
> + echo 1 > /sys/bus/i2c/devices/xxxx/run_engine
> +
> +How to load the predefined patterns
> +
> + Please refer to 'leds-lp55xx.txt"
> +
> +Setting Current of Each Channel
> +
> + Like LP5521 and LP5523/55231, LP5562 provides LED current settings.
> + The 'led_current' and 'max_current' are used.
> +
> +(Example of Platform data)
> +
> +To configure the platform specific data, lp55xx_platform_data structure is used.
> +
> +static struct lp55xx_led_config lp5562_led_config[] = {
> + {
> + .name = "R",
> + .chan_nr = 0,
> + .led_current = 20,
> + .max_current = 40,
> + },
> + {
> + .name = "G",
> + .chan_nr = 1,
> + .led_current = 20,
> + .max_current = 40,
> + },
> + {
> + .name = "B",
> + .chan_nr = 2,
> + .led_current = 20,
> + .max_current = 40,
> + },
> + {
> + .name = "W",
> + .chan_nr = 3,
> + .led_current = 20,
> + .max_current = 40,
> + },
> +};
> +
> +static int lp5562_setup(void)
> +{
> + /* setup HW resources */
> +}
> +
> +static void lp5562_release(void)
> +{
> + /* Release HW resources */
> +}
> +
> +static void lp5562_enable(bool state)
> +{
> + /* Control of chip enable signal */
> +}
> +
> +static struct lp55xx_platform_data lp5562_platform_data = {
> + .led_config = lp5562_led_config,
> + .num_channels = ARRAY_SIZE(lp5562_led_config),
> + .setup_resources = lp5562_setup,
> + .release_resources = lp5562_release,
> + .enable = lp5562_enable,
> +};
> +
> +If the current is set to 0 in the platform data, that channel is
> +disabled and it is not visible in the sysfs.
> +
> +The 'update_config' : CONFIG register (ADDR 08h)
> +This value is platform-specific data.
> +If update_config is not defined, the CONFIG register is set with
> +'LP5562_PWRSAVE_EN | LP5562_CLK_AUTO'.
> +(Enable auto-powersave, set automatic clock source selection)
> +
> +#define LP5562_CONFIGS (LP5562_PWM_HF | LP5562_PWRSAVE_EN | \
> + LP5562_CLK_SRC_EXT)
> +
> +static struct lp55xx_platform_data lp5562_pdata = {
> + .led_config = lp5562_led_config,
> + .num_channels = ARRAY_SIZE(lp5562_led_config),
> + .update_config = LP5562_CONFIGS,
> +};
> diff --git a/Documentation/leds/leds-lp55xx.txt b/Documentation/leds/leds-lp55xx.txt
> index ced4186..eec8fa2 100644
> --- a/Documentation/leds/leds-lp55xx.txt
> +++ b/Documentation/leds/leds-lp55xx.txt
> @@ -5,7 +5,7 @@ Authors: Milo(Woogyom) Kim <milo.kim@xxxxxx>
>
> Description
> -----------
> -LP5521, LP5523/55231 have common features as below.
> +LP5521, LP5523/55231 and LP5562 have common features as below.
>
> Register access via the I2C
> Device initialization/deinitialization
> @@ -116,3 +116,47 @@ To support this, 'run_engine' and 'firmware_cb' are configurable in each driver.
> run_engine : Control the selected engine
> firmware_cb : The callback function after loading the firmware is done.
> Chip specific commands for loading and updating program memory.
> +
> +( Predefined pattern data )
> +
> +Without the firmware interface, LP55xx driver provides another method for
> +loading a LED pattern. That is 'predefined' pattern.
> +A predefined pattern is defined in the platform data and load it(or them)
> +via the sysfs if needed.
> +To use the predefined pattern concept, 'patterns' and 'num_patterns' should be
> +configured.
> +
> + Example of predefined pattern data:
> +
> + /* mode_1: blinking data */
> + static const u8 mode_1[] = {
> + 0x40, 0x00, 0x60, 0x00, 0x40, 0xFF, 0x60, 0x00,
> + };
> +
> + /* mode_2: always on */
> + static const u8 mode_2[] = { 0x40, 0xFF, };
> +
> + struct lp55xx_predef_pattern board_led_patterns[] = {
> + {
> + .r = mode_1,
> + .size_r = ARRAY_SIZE(mode_1),
> + },
> + {
> + .b = mode_2,
> + .size_b = ARRAY_SIZE(mode_2),
> + },
> + }
> +
> + struct lp55xx_platform_data lp5562_pdata = {
> + ...
> + .patterns = board_led_patterns,
> + .num_patterns = ARRAY_SIZE(board_led_patterns),
> + };
> +
> +Then, mode_1 and mode_2 can be run via through the sysfs.
> +
> + echo 1 > /sys/bus/i2c/devices/xxxx/led_pattern # red blinking LED pattern
> + echo 2 > /sys/bus/i2c/devices/xxxx/led_pattern # blue LED always on
> +
> +To stop running pattern,
> + echo 0 > /sys/bus/i2c/devices/xxxx/led_pattern
> diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
> index 78b354f..913326f 100644
> --- a/drivers/leds/Kconfig
> +++ b/drivers/leds/Kconfig
> @@ -194,8 +194,8 @@ config LEDS_LP3944
> module will be called leds-lp3944.
>
> config LEDS_LP55XX_COMMON
> - tristate "Common Driver for TI/National LP5521 and LP5523/55231"
> - depends on LEDS_LP5521 || LEDS_LP5523
> + tristate "Common Driver for TI/National LP5521, LP5523/55231 and LP5562"
> + depends on LEDS_LP5521 || LEDS_LP5523 || LEDS_LP5562
> select FW_LOADER
> help
> This option supports common operations for LP5521 and LP5523/55231
> @@ -222,6 +222,16 @@ config LEDS_LP5523
> Driver provides direct control via LED class and interface for
> programming the engines.
>
> +config LEDS_LP5562
> + tristate "LED Support for TI LP5562 LED driver chip"
> + depends on LEDS_CLASS && I2C
> + select LEDS_LP55XX_COMMON
> + help
> + If you say yes here you get support for TI LP5562 LED driver.
> + It is 4 channels chip with programmable engines.
> + Driver provides direct control via LED class and interface for
> + programming the engines.
> +
> config LEDS_LP8788
> tristate "LED support for the TI LP8788 PMIC"
> depends on LEDS_CLASS
> diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
> index 215e7e3..ab8f5c5 100644
> --- a/drivers/leds/Makefile
> +++ b/drivers/leds/Makefile
> @@ -26,6 +26,7 @@ obj-$(CONFIG_LEDS_LP3944) += leds-lp3944.o
> obj-$(CONFIG_LEDS_LP55XX_COMMON) += leds-lp55xx-common.o
> obj-$(CONFIG_LEDS_LP5521) += leds-lp5521.o
> obj-$(CONFIG_LEDS_LP5523) += leds-lp5523.o
> +obj-$(CONFIG_LEDS_LP5562) += leds-lp5562.o
> obj-$(CONFIG_LEDS_LP8788) += leds-lp8788.o
> obj-$(CONFIG_LEDS_TCA6507) += leds-tca6507.o
> obj-$(CONFIG_LEDS_CLEVO_MAIL) += leds-clevo-mail.o
> diff --git a/drivers/leds/leds-lp5562.c b/drivers/leds/leds-lp5562.c
> new file mode 100644
> index 0000000..9974033
> --- /dev/null
> +++ b/drivers/leds/leds-lp5562.c
> @@ -0,0 +1,594 @@
> +/*
> + * LP5562 LED driver
> + *
> + * Copyright (C) 2013 Texas Instruments
> + *
> + * Author: Milo(Woogyom) Kim <milo.kim@xxxxxx>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#include <linux/delay.h>
> +#include <linux/firmware.h>
> +#include <linux/i2c.h>
> +#include <linux/init.h>
> +#include <linux/leds.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/platform_data/leds-lp55xx.h>
> +#include <linux/slab.h>
> +
> +#include "leds-lp55xx-common.h"
> +
> +#define LP5562_PROGRAM_LENGTH 32
> +#define LP5562_MAX_LEDS 4
> +
> +/* ENABLE Register 00h */
> +#define LP5562_REG_ENABLE 0x00
> +#define LP5562_EXEC_ENG1_M 0x30
> +#define LP5562_EXEC_ENG2_M 0x0C
> +#define LP5562_EXEC_ENG3_M 0x03
> +#define LP5562_EXEC_M 0x3F
> +#define LP5562_MASTER_ENABLE 0x40 /* Chip master enable */
> +#define LP5562_LOGARITHMIC_PWM 0x80 /* Logarithmic PWM adjustment */
> +#define LP5562_EXEC_RUN 0x2A
> +#define LP5562_ENABLE_DEFAULT \
> + (LP5562_MASTER_ENABLE | LP5562_LOGARITHMIC_PWM)
> +#define LP5562_ENABLE_RUN_PROGRAM \
> + (LP5562_ENABLE_DEFAULT | LP5562_EXEC_RUN)
> +
> +/* OPMODE Register 01h */
> +#define LP5562_REG_OP_MODE 0x01
> +#define LP5562_MODE_ENG1_M 0x30
> +#define LP5562_MODE_ENG2_M 0x0C
> +#define LP5562_MODE_ENG3_M 0x03
> +#define LP5562_LOAD_ENG1 0x10
> +#define LP5562_LOAD_ENG2 0x04
> +#define LP5562_LOAD_ENG3 0x01
> +#define LP5562_RUN_ENG1 0x20
> +#define LP5562_RUN_ENG2 0x08
> +#define LP5562_RUN_ENG3 0x02
> +#define LP5562_ENG1_IS_LOADING(mode) \
> + ((mode & LP5562_MODE_ENG1_M) == LP5562_LOAD_ENG1)
> +#define LP5562_ENG2_IS_LOADING(mode) \
> + ((mode & LP5562_MODE_ENG2_M) == LP5562_LOAD_ENG2)
> +#define LP5562_ENG3_IS_LOADING(mode) \
> + ((mode & LP5562_MODE_ENG3_M) == LP5562_LOAD_ENG3)
> +
> +/* BRIGHTNESS Registers */
> +#define LP5562_REG_R_PWM 0x04
> +#define LP5562_REG_G_PWM 0x03
> +#define LP5562_REG_B_PWM 0x02
> +#define LP5562_REG_W_PWM 0x0E
> +
> +/* CURRENT Registers */
> +#define LP5562_REG_R_CURRENT 0x07
> +#define LP5562_REG_G_CURRENT 0x06
> +#define LP5562_REG_B_CURRENT 0x05
> +#define LP5562_REG_W_CURRENT 0x0F
> +
> +/* CONFIG Register 08h */
> +#define LP5562_REG_CONFIG 0x08
> +#define LP5562_DEFAULT_CFG \
> + (LP5562_PWM_HF | LP5562_PWRSAVE_EN | LP5562_CLK_INT)
> +
> +/* RESET Register 0Dh */
> +#define LP5562_REG_RESET 0x0D
> +#define LP5562_RESET 0xFF
> +
> +/* PROGRAM ENGINE Registers */
> +#define LP5562_REG_PROG_MEM_ENG1 0x10
> +#define LP5562_REG_PROG_MEM_ENG2 0x30
> +#define LP5562_REG_PROG_MEM_ENG3 0x50
> +
> +/* LEDMAP Register 70h */
> +#define LP5562_REG_ENG_SEL 0x70
> +#define LP5562_ENG_SEL_PWM 0
> +#define LP5562_ENG_FOR_RGB_M 0x3F
> +#define LP5562_ENG_SEL_RGB 0x1B /* R:ENG1, G:ENG2, B:ENG3 */
> +#define LP5562_ENG_FOR_W_M 0xC0
> +#define LP5562_ENG1_FOR_W 0x40 /* W:ENG1 */
> +#define LP5562_ENG2_FOR_W 0x80 /* W:ENG2 */
> +#define LP5562_ENG3_FOR_W 0xC0 /* W:ENG3 */
> +
> +/* Program Commands */
> +#define LP5562_CMD_DISABLE 0x00
> +#define LP5562_CMD_LOAD 0x15
> +#define LP5562_CMD_RUN 0x2A
> +#define LP5562_CMD_DIRECT 0x3F
> +#define LP5562_PATTERN_OFF 0
> +
> +static inline void lp5562_wait_opmode_done(void)
> +{
> + /* operation mode change needs to be longer than 153 us */
> + usleep_range(200, 300);
> +}
> +
> +static inline void lp5562_wait_enable_done(void)
> +{
> + /* it takes more 488 us to update ENABLE register */
> + usleep_range(500, 600);
> +}
> +
> +static void lp5562_set_led_current(struct lp55xx_led *led, u8 led_current)
> +{
> + u8 addr[] = {
> + LP5562_REG_R_CURRENT,
> + LP5562_REG_G_CURRENT,
> + LP5562_REG_B_CURRENT,
> + LP5562_REG_W_CURRENT,
> + };
> +
> + led->led_current = led_current;
> + lp55xx_write(led->chip, addr[led->chan_nr], led_current);
> +}
> +
> +static void lp5562_load_engine(struct lp55xx_chip *chip)
> +{
> + enum lp55xx_engine_index idx = chip->engine_idx;
> + u8 mask[] = {
> + [LP55XX_ENGINE_1] = LP5562_MODE_ENG1_M,
> + [LP55XX_ENGINE_2] = LP5562_MODE_ENG2_M,
> + [LP55XX_ENGINE_3] = LP5562_MODE_ENG3_M,
> + };
> +
> + u8 val[] = {
> + [LP55XX_ENGINE_1] = LP5562_LOAD_ENG1,
> + [LP55XX_ENGINE_2] = LP5562_LOAD_ENG2,
> + [LP55XX_ENGINE_3] = LP5562_LOAD_ENG3,
> + };
> +
> + lp55xx_update_bits(chip, LP5562_REG_OP_MODE, mask[idx], val[idx]);
> +
> + lp5562_wait_opmode_done();
> +}
> +
> +static void lp5562_stop_engine(struct lp55xx_chip *chip)
> +{
> + lp55xx_write(chip, LP5562_REG_OP_MODE, LP5562_CMD_DISABLE);
> + lp5562_wait_opmode_done();
> +}
> +
> +static void lp5562_run_engine(struct lp55xx_chip *chip, bool start)
> +{
> + int ret;
> + u8 mode;
> + u8 exec;
> +
> + /* stop engine */
> + if (!start) {
> + lp55xx_write(chip, LP5562_REG_ENABLE, LP5562_ENABLE_DEFAULT);
> + lp5562_wait_enable_done();
> + lp5562_stop_engine(chip);
> + lp55xx_write(chip, LP5562_REG_ENG_SEL, LP5562_ENG_SEL_PWM);
> + lp55xx_write(chip, LP5562_REG_OP_MODE, LP5562_CMD_DIRECT);
> + lp5562_wait_opmode_done();
> + return;
> + }
> +
> + /*
> + * To run the engine,
> + * operation mode and enable register should updated at the same time
> + */
> +
> + ret = lp55xx_read(chip, LP5562_REG_OP_MODE, &mode);
> + if (ret)
> + return;
> +
> + ret = lp55xx_read(chip, LP5562_REG_ENABLE, &exec);
> + if (ret)
> + return;
> +
> + /* change operation mode to RUN only when each engine is loading */
> + if (LP5562_ENG1_IS_LOADING(mode)) {
> + mode = (mode & ~LP5562_MODE_ENG1_M) | LP5562_RUN_ENG1;
> + exec = (exec & ~LP5562_EXEC_ENG1_M) | LP5562_RUN_ENG1;
> + }
> +
> + if (LP5562_ENG2_IS_LOADING(mode)) {
> + mode = (mode & ~LP5562_MODE_ENG2_M) | LP5562_RUN_ENG2;
> + exec = (exec & ~LP5562_EXEC_ENG2_M) | LP5562_RUN_ENG2;
> + }
> +
> + if (LP5562_ENG3_IS_LOADING(mode)) {
> + mode = (mode & ~LP5562_MODE_ENG3_M) | LP5562_RUN_ENG3;
> + exec = (exec & ~LP5562_EXEC_ENG3_M) | LP5562_RUN_ENG3;
> + }
> +
> + lp55xx_write(chip, LP5562_REG_OP_MODE, mode);
> + lp5562_wait_opmode_done();
> +
> + lp55xx_update_bits(chip, LP5562_REG_ENABLE, LP5562_EXEC_M, exec);
> + lp5562_wait_enable_done();
> +}
> +
> +static int lp5562_update_firmware(struct lp55xx_chip *chip,
> + const u8 *data, size_t size)
> +{
> + enum lp55xx_engine_index idx = chip->engine_idx;
> + u8 pattern[LP5562_PROGRAM_LENGTH] = {0};
> + u8 addr[] = {
> + [LP55XX_ENGINE_1] = LP5562_REG_PROG_MEM_ENG1,
> + [LP55XX_ENGINE_2] = LP5562_REG_PROG_MEM_ENG2,
> + [LP55XX_ENGINE_3] = LP5562_REG_PROG_MEM_ENG3,
> + };
> + unsigned cmd;
> + char c[3];
> + int program_size;
> + int nrchars;
> + int offset = 0;
> + int ret;
> + int i;
> +
> + /* clear program memory before updating */
> + for (i = 0; i < LP5562_PROGRAM_LENGTH; i++)
> + lp55xx_write(chip, addr[idx] + i, 0);
> +
> + i = 0;
> + while ((offset < size - 1) && (i < LP5562_PROGRAM_LENGTH)) {
> + /* separate sscanfs because length is working only for %s */
> + ret = sscanf(data + offset, "%2s%n ", c, &nrchars);
> + if (ret != 1)
> + goto err;
> +
> + ret = sscanf(c, "%2x", &cmd);
> + if (ret != 1)
> + goto err;
> +
> + pattern[i] = (u8)cmd;
> + offset += nrchars;
> + i++;
> + }
> +
> + /* Each instruction is 16bit long. Check that length is even */
> + if (i % 2)
> + goto err;
> +
> + program_size = i;
> + for (i = 0; i < program_size; i++)
> + lp55xx_write(chip, addr[idx] + i, pattern[i]);
> +
> + return 0;
> +
> +err:
> + dev_err(&chip->cl->dev, "wrong pattern format\n");
> + return -EINVAL;
> +}
> +
> +static void lp5562_firmware_loaded(struct lp55xx_chip *chip)
> +{
> + const struct firmware *fw = chip->fw;
> +
> + if (fw->size > LP5562_PROGRAM_LENGTH) {
> + dev_err(&chip->cl->dev, "firmware data size overflow: %zu\n",
> + fw->size);
> + return;
> + }
> +
> + /*
> + * Program momery sequence
> + * 1) set engine mode to "LOAD"
> + * 2) write firmware data into program memory
> + */
> +
> + lp5562_load_engine(chip);
> + lp5562_update_firmware(chip, fw->data, fw->size);
> +}
> +
> +static int lp5562_post_init_device(struct lp55xx_chip *chip)
> +{
> + int ret;
> + u8 update_cfg = chip->pdata->update_config ? : LP5562_DEFAULT_CFG;
> +
> + /* Set all PWMs to direct control mode */
> + ret = lp55xx_write(chip, LP5562_REG_OP_MODE, LP5562_CMD_DIRECT);
> + if (ret)
> + return ret;
> +
> + lp5562_wait_opmode_done();
> +
> + ret = lp55xx_write(chip, LP5562_REG_CONFIG, update_cfg);
> + if (ret)
> + return ret;
> +
> + /* Initialize all channels PWM to zero -> leds off */
> + lp55xx_write(chip, LP5562_REG_R_PWM, 0);
> + lp55xx_write(chip, LP5562_REG_G_PWM, 0);
> + lp55xx_write(chip, LP5562_REG_B_PWM, 0);
> + lp55xx_write(chip, LP5562_REG_W_PWM, 0);
> +
> + /* Set LED map as register PWM by default */
> + lp55xx_write(chip, LP5562_REG_ENG_SEL, LP5562_ENG_SEL_PWM);
> +
> + return 0;
> +}
> +
> +static void lp5562_led_brightness_work(struct work_struct *work)
> +{
> + struct lp55xx_led *led = container_of(work, struct lp55xx_led,
> + brightness_work);
> + struct lp55xx_chip *chip = led->chip;
> + u8 addr[] = {
> + LP5562_REG_R_PWM,
> + LP5562_REG_G_PWM,
> + LP5562_REG_B_PWM,
> + LP5562_REG_W_PWM,
> + };
> +
> + mutex_lock(&chip->lock);
> + lp55xx_write(chip, addr[led->chan_nr], led->brightness);
> + mutex_unlock(&chip->lock);
> +}
> +
> +static void lp5562_write_program_memory(struct lp55xx_chip *chip,
> + u8 base, const u8 *rgb, int size)
> +{
> + int i;
> +
> + if (!rgb || size <= 0)
> + return;
> +
> + for (i = 0; i < size; i++)
> + lp55xx_write(chip, base + i, *(rgb + i));
> +
> + lp55xx_write(chip, base + i, 0);
> + lp55xx_write(chip, base + i + 1, 0);
> +}
> +
> +/* check the size of program count */
> +static inline bool _is_pc_overflow(struct lp55xx_predef_pattern *ptn)
> +{
> + return (ptn->size_r >= LP5562_PROGRAM_LENGTH ||
> + ptn->size_g >= LP5562_PROGRAM_LENGTH ||
> + ptn->size_b >= LP5562_PROGRAM_LENGTH);
> +}
> +
> +static int lp5562_run_predef_led_pattern(struct lp55xx_chip *chip, int mode)
> +{
> + struct lp55xx_predef_pattern *ptn;
> + int i;
> +
> + if (mode == LP5562_PATTERN_OFF) {
> + lp5562_run_engine(chip, false);
> + return 0;
> + }
> +
> + ptn = chip->pdata->patterns + (mode - 1);
> + if (!ptn || _is_pc_overflow(ptn)) {
> + dev_err(&chip->cl->dev, "invalid pattern data\n");
> + return -EINVAL;
> + }
> +
> + lp5562_stop_engine(chip);
> +
> + /* Set LED map as RGB */
> + lp55xx_write(chip, LP5562_REG_ENG_SEL, LP5562_ENG_SEL_RGB);
> +
> + /* Load engines */
> + for (i = LP55XX_ENGINE_1; i <= LP55XX_ENGINE_3; i++) {
> + chip->engine_idx = i;
> + lp5562_load_engine(chip);
> + }
> +
> + /* Clear program registers */
> + lp55xx_write(chip, LP5562_REG_PROG_MEM_ENG1, 0);
> + lp55xx_write(chip, LP5562_REG_PROG_MEM_ENG1 + 1, 0);
> + lp55xx_write(chip, LP5562_REG_PROG_MEM_ENG2, 0);
> + lp55xx_write(chip, LP5562_REG_PROG_MEM_ENG2 + 1, 0);
> + lp55xx_write(chip, LP5562_REG_PROG_MEM_ENG3, 0);
> + lp55xx_write(chip, LP5562_REG_PROG_MEM_ENG3 + 1, 0);
> +
> + /* Program engines */
> + lp5562_write_program_memory(chip, LP5562_REG_PROG_MEM_ENG1,
> + ptn->r, ptn->size_r);
> + lp5562_write_program_memory(chip, LP5562_REG_PROG_MEM_ENG2,
> + ptn->g, ptn->size_g);
> + lp5562_write_program_memory(chip, LP5562_REG_PROG_MEM_ENG3,
> + ptn->b, ptn->size_b);
> +
> + /* Run engines */
> + lp5562_run_engine(chip, true);
> +
> + return 0;
> +}
> +
> +static ssize_t lp5562_store_pattern(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf, size_t len)
> +{
> + struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
> + struct lp55xx_chip *chip = led->chip;
> + struct lp55xx_predef_pattern *ptn = chip->pdata->patterns;
> + int num_patterns = chip->pdata->num_patterns;
> + unsigned long mode;
> + int ret;
> +
> + ret = kstrtoul(buf, 0, &mode);
> + if (ret)
> + return ret;
> +
> + if (mode > num_patterns || !ptn)
> + return -EINVAL;
> +
> + mutex_lock(&chip->lock);
> + ret = lp5562_run_predef_led_pattern(chip, mode);
> + mutex_unlock(&chip->lock);
> +
> + if (ret)
> + return ret;
> +
> + return len;
> +}
> +
> +static ssize_t lp5562_store_engine_mux(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf, size_t len)
> +{
> + struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
> + struct lp55xx_chip *chip = led->chip;
> + u8 mask;
> + u8 val;
> +
> + /* LED map
> + * R ... Engine 1 (fixed)
> + * G ... Engine 2 (fixed)
> + * B ... Engine 3 (fixed)
> + * W ... Engine 1 or 2 or 3
> + */
> +
> + if (sysfs_streq(buf, "RGB")) {
> + mask = LP5562_ENG_FOR_RGB_M;
> + val = LP5562_ENG_SEL_RGB;
> + } else if (sysfs_streq(buf, "W")) {
> + enum lp55xx_engine_index idx = chip->engine_idx;
> +
> + mask = LP5562_ENG_FOR_W_M;
> + switch (idx) {
> + case LP55XX_ENGINE_1:
> + val = LP5562_ENG1_FOR_W;
> + break;
> + case LP55XX_ENGINE_2:
> + val = LP5562_ENG2_FOR_W;
> + break;
> + case LP55XX_ENGINE_3:
> + val = LP5562_ENG3_FOR_W;
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + } else {
> + dev_err(dev, "choose RGB or W\n");
> + mutex_unlock(&chip->lock);
> + return -EINVAL;
> + }
> +
> + mutex_lock(&chip->lock);
> + lp55xx_update_bits(chip, LP5562_REG_ENG_SEL, mask, val);
> + mutex_unlock(&chip->lock);
> +
> + return len;
> +}
> +
> +static DEVICE_ATTR(led_pattern, S_IWUSR, NULL, lp5562_store_pattern);
> +static DEVICE_ATTR(engine_mux, S_IWUSR, NULL, lp5562_store_engine_mux);
> +
> +static struct attribute *lp5562_attributes[] = {
> + &dev_attr_led_pattern.attr,
> + &dev_attr_engine_mux.attr,
> + NULL,
> +};
> +
> +static const struct attribute_group lp5562_group = {
> + .attrs = lp5562_attributes,
> +};
> +
> +/* Chip specific configurations */
> +static struct lp55xx_device_config lp5562_cfg = {
> + .max_channel = LP5562_MAX_LEDS,
> + .reset = {
> + .addr = LP5562_REG_RESET,
> + .val = LP5562_RESET,
> + },
> + .enable = {
> + .addr = LP5562_REG_ENABLE,
> + .val = LP5562_ENABLE_DEFAULT,
> + },
> + .post_init_device = lp5562_post_init_device,
> + .set_led_current = lp5562_set_led_current,
> + .brightness_work_fn = lp5562_led_brightness_work,
> + .run_engine = lp5562_run_engine,
> + .firmware_cb = lp5562_firmware_loaded,
> + .dev_attr_group = &lp5562_group,
> +};
> +
> +static int lp5562_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 = client->dev.platform_data;
> +
> + if (!pdata) {
> + dev_err(&client->dev, "no platform data\n");
> + return -EINVAL;
> + }
> +
> + 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 = &lp5562_cfg;
> +
> + mutex_init(&chip->lock);
> +
> + i2c_set_clientdata(client, led);
> +
> + ret = lp55xx_init_device(chip);
> + if (ret)
> + goto err_init;
> +
> + 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 lp5562_remove(struct i2c_client *client)
> +{
> + struct lp55xx_led *led = i2c_get_clientdata(client);
> + struct lp55xx_chip *chip = led->chip;
> +
> + lp5562_stop_engine(chip);
> +
> + lp55xx_unregister_sysfs(chip);
> + lp55xx_unregister_leds(led, chip);
> + lp55xx_deinit_device(chip);
> +
> + return 0;
> +}
> +
> +static const struct i2c_device_id lp5562_id[] = {
> + { "lp5562", 0 },
> + { }
> +};
> +MODULE_DEVICE_TABLE(i2c, lp5562_id);
> +
> +static struct i2c_driver lp5562_driver = {
> + .driver = {
> + .name = "lp5562",
> + },
> + .probe = lp5562_probe,
> + .remove = lp5562_remove,
> + .id_table = lp5562_id,
> +};
> +
> +module_i2c_driver(lp5562_driver);
> +
> +MODULE_DESCRIPTION("Texas Instruments LP5562 LED Driver");
> +MODULE_AUTHOR("Milo Kim");
> +MODULE_LICENSE("GPL");
> diff --git a/include/linux/platform_data/leds-lp55xx.h b/include/linux/platform_data/leds-lp55xx.h
> index 1509570..1f1041e 100644
> --- a/include/linux/platform_data/leds-lp55xx.h
> +++ b/include/linux/platform_data/leds-lp55xx.h
> @@ -32,6 +32,13 @@
> #define LP5521_CLK_INT 1 /* Internal clock */
> #define LP5521_CLK_AUTO 2 /* Automatic clock selection */
>
> +/* Bits in LP5562 CONFIG register */
> +#define LP5562_PWM_HF LP5521_PWM_HF
> +#define LP5562_PWRSAVE_EN LP5521_PWRSAVE_EN
> +#define LP5562_CLK_SRC_EXT LP5521_CLK_SRC_EXT
> +#define LP5562_CLK_INT LP5521_CLK_INT
> +#define LP5562_CLK_AUTO LP5521_CLK_AUTO
> +
> struct lp55xx_led_config {
> const char *name;
> u8 chan_nr;
> @@ -40,9 +47,9 @@ struct lp55xx_led_config {
> };
>
> struct lp55xx_predef_pattern {
> - u8 *r;
> - u8 *g;
> - u8 *b;
> + const u8 *r;
> + const u8 *g;
> + const u8 *b;
> u8 size_r;
> u8 size_g;
> u8 size_b;
> --
> 1.7.9.5
>
>
> Best Regards,
> Milo
>
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/