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![Dan Carpenter](/assets/img/avatar_default.png)
If choose_times() returns -EINVAL that means "c1" and "c2" haven't been initialized. I've added a check for that. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>
847 lines
22 KiB
C
847 lines
22 KiB
C
/*
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* leds-tca6507
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*
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* The TCA6507 is a programmable LED controller that can drive 7
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* separate lines either by holding them low, or by pulsing them
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* with modulated width.
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* The modulation can be varied in a simple pattern to produce a
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* blink or double-blink.
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*
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* This driver can configure each line either as a 'GPIO' which is
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* out-only (pull-up resistor required) or as an LED with variable
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* brightness and hardware-assisted blinking.
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*
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* Apart from OFF and ON there are three programmable brightness
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* levels which can be programmed from 0 to 15 and indicate how many
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* 500usec intervals in each 8msec that the led is 'on'. The levels
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* are named MASTER, BANK0 and BANK1.
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*
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* There are two different blink rates that can be programmed, each
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* with separate time for rise, on, fall, off and second-off. Thus if
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* 3 or more different non-trivial rates are required, software must
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* be used for the extra rates. The two different blink rates must
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* align with the two levels BANK0 and BANK1. This driver does not
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* support double-blink so 'second-off' always matches 'off'.
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*
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* Only 16 different times can be programmed in a roughly logarithmic
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* scale from 64ms to 16320ms. To be precise the possible times are:
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* 0, 64, 128, 192, 256, 384, 512, 768,
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* 1024, 1536, 2048, 3072, 4096, 5760, 8128, 16320
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*
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* Times that cannot be closely matched with these must be handled in
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* software. This driver allows 12.5% error in matching.
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*
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* This driver does not allow rise/fall rates to be set explicitly.
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* When trying to match a given 'on' or 'off' period, an appropriate
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* pair of 'change' and 'hold' times are chosen to get a close match.
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* If the target delay is even, the 'change' number will be the
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* smaller; if odd, the 'hold' number will be the smaller.
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* Choosing pairs of delays with 12.5% errors allows us to match
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* delays in the ranges: 56-72, 112-144, 168-216, 224-27504,
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* 28560-36720.
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* 26% of the achievable sums can be matched by multiple pairings.
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* For example 1536 == 1536+0, 1024+512, or 768+768.
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* This driver will always choose the pairing with the least
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* maximum - 768+768 in this case. Other pairings are not available.
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*
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* Access to the 3 levels and 2 blinks are on a first-come,
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* first-served basis. Access can be shared by multiple leds if they
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* have the same level and either same blink rates, or some don't
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* blink. When a led changes, it relinquishes access and tries again,
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* so it might lose access to hardware blink.
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*
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* If a blink engine cannot be allocated, software blink is used. If
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* the desired brightness cannot be allocated, the closest available
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* non-zero brightness is used. As 'full' is always available, the
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* worst case would be to have two different blink rates at '1', with
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* Max at '2', then other leds will have to choose between '2' and
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* '16'. Hopefully this is not likely.
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*
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* Each bank (BANK0 and BANK1) has two usage counts - LEDs using the
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* brightness and LEDs using the blink. It can only be reprogrammed
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* when the appropriate counter is zero. The MASTER level has a
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* single usage count.
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*
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* Each LED has programmable 'on' and 'off' time as milliseconds.
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* With each there is a flag saying if it was explicitly requested or
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* defaulted. Similarly the banks know if each time was explicit or a
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* default. Defaults are permitted to be changed freely - they are
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* not recognised when matching.
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*
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*
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* An led-tca6507 device must be provided with platform data or
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* configured via devicetree.
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*
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* The platform-data lists for each output: the name, default trigger,
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* and whether the signal is being used as a GPIO rather than an LED.
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* 'struct led_plaform_data' is used for this. If 'name' is NULL, the
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* output isn't used. If 'flags' is TCA6507_MAKE_GPIO, the output is
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* a GPO. The "struct led_platform_data" can be embedded in a "struct
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* tca6507_platform_data" which adds a 'gpio_base' for the GPIOs, and
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* a 'setup' callback which is called once the GPIOs are available.
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*
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* When configured via devicetree there is one child for each output.
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* The "reg" determines the output number and "compatible" determines
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* whether it is an LED or a GPIO. "linux,default-trigger" can set a
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* default trigger.
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/leds.h>
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#include <linux/err.h>
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#include <linux/i2c.h>
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#include <linux/gpio.h>
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#include <linux/workqueue.h>
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#include <linux/leds-tca6507.h>
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#include <linux/of.h>
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/* LED select registers determine the source that drives LED outputs */
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#define TCA6507_LS_LED_OFF 0x0 /* Output HI-Z (off) */
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#define TCA6507_LS_LED_OFF1 0x1 /* Output HI-Z (off) - not used */
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#define TCA6507_LS_LED_PWM0 0x2 /* Output LOW with Bank0 rate */
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#define TCA6507_LS_LED_PWM1 0x3 /* Output LOW with Bank1 rate */
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#define TCA6507_LS_LED_ON 0x4 /* Output LOW (on) */
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#define TCA6507_LS_LED_MIR 0x5 /* Output LOW with Master Intensity */
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#define TCA6507_LS_BLINK0 0x6 /* Blink at Bank0 rate */
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#define TCA6507_LS_BLINK1 0x7 /* Blink at Bank1 rate */
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enum {
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BANK0,
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BANK1,
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MASTER,
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};
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static int bank_source[3] = {
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TCA6507_LS_LED_PWM0,
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TCA6507_LS_LED_PWM1,
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TCA6507_LS_LED_MIR,
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};
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static int blink_source[2] = {
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TCA6507_LS_BLINK0,
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TCA6507_LS_BLINK1,
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};
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/* PWM registers */
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#define TCA6507_REG_CNT 11
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/*
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* 0x00, 0x01, 0x02 encode the TCA6507_LS_* values, each output
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* owns one bit in each register
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*/
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#define TCA6507_FADE_ON 0x03
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#define TCA6507_FULL_ON 0x04
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#define TCA6507_FADE_OFF 0x05
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#define TCA6507_FIRST_OFF 0x06
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#define TCA6507_SECOND_OFF 0x07
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#define TCA6507_MAX_INTENSITY 0x08
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#define TCA6507_MASTER_INTENSITY 0x09
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#define TCA6507_INITIALIZE 0x0A
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#define INIT_CODE 0x8
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#define TIMECODES 16
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static int time_codes[TIMECODES] = {
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0, 64, 128, 192, 256, 384, 512, 768,
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1024, 1536, 2048, 3072, 4096, 5760, 8128, 16320
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};
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/* Convert an led.brightness level (0..255) to a TCA6507 level (0..15) */
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static inline int TO_LEVEL(int brightness)
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{
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return brightness >> 4;
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}
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/* ...and convert back */
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static inline int TO_BRIGHT(int level)
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{
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if (level)
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return (level << 4) | 0xf;
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return 0;
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}
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#define NUM_LEDS 7
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struct tca6507_chip {
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int reg_set; /* One bit per register where
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* a '1' means the register
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* should be written */
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u8 reg_file[TCA6507_REG_CNT];
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/* Bank 2 is Master Intensity and doesn't use times */
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struct bank {
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int level;
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int ontime, offtime;
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int on_dflt, off_dflt;
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int time_use, level_use;
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} bank[3];
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struct i2c_client *client;
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struct work_struct work;
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spinlock_t lock;
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struct tca6507_led {
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struct tca6507_chip *chip;
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struct led_classdev led_cdev;
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int num;
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int ontime, offtime;
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int on_dflt, off_dflt;
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int bank; /* Bank used, or -1 */
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int blink; /* Set if hardware-blinking */
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} leds[NUM_LEDS];
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#ifdef CONFIG_GPIOLIB
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struct gpio_chip gpio;
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const char *gpio_name[NUM_LEDS];
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int gpio_map[NUM_LEDS];
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#endif
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};
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static const struct i2c_device_id tca6507_id[] = {
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{ "tca6507" },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, tca6507_id);
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static int choose_times(int msec, int *c1p, int *c2p)
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{
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/*
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* Choose two timecodes which add to 'msec' as near as
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* possible. The first returned is the 'on' or 'off' time.
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* The second is to be used as a 'fade-on' or 'fade-off' time.
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* If 'msec' is even, the first will not be smaller than the
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* second. If 'msec' is odd, the first will not be larger
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* than the second.
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* If we cannot get a sum within 1/8 of 'msec' fail with
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* -EINVAL, otherwise return the sum that was achieved, plus 1
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* if the first is smaller.
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* If two possibilities are equally good (e.g. 512+0,
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* 256+256), choose the first pair so there is more
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* change-time visible (i.e. it is softer).
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*/
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int c1, c2;
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int tmax = msec * 9 / 8;
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int tmin = msec * 7 / 8;
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int diff = 65536;
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/* We start at '1' to ensure we never even think of choosing a
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* total time of '0'.
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*/
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for (c1 = 1; c1 < TIMECODES; c1++) {
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int t = time_codes[c1];
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if (t*2 < tmin)
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continue;
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if (t > tmax)
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break;
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for (c2 = 0; c2 <= c1; c2++) {
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int tt = t + time_codes[c2];
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int d;
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if (tt < tmin)
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continue;
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if (tt > tmax)
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break;
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/* This works! */
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d = abs(msec - tt);
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if (d >= diff)
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continue;
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/* Best yet */
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*c1p = c1;
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*c2p = c2;
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diff = d;
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if (d == 0)
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return msec;
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}
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}
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if (diff < 65536) {
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int actual;
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if (msec & 1) {
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c1 = *c2p;
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*c2p = *c1p;
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*c1p = c1;
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}
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actual = time_codes[*c1p] + time_codes[*c2p];
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if (*c1p < *c2p)
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return actual + 1;
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else
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return actual;
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}
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/* No close match */
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return -EINVAL;
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}
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/*
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* Update the register file with the appropriate 3-bit state for the
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* given led.
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*/
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static void set_select(struct tca6507_chip *tca, int led, int val)
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{
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int mask = (1 << led);
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int bit;
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for (bit = 0; bit < 3; bit++) {
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int n = tca->reg_file[bit] & ~mask;
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if (val & (1 << bit))
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n |= mask;
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if (tca->reg_file[bit] != n) {
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tca->reg_file[bit] = n;
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tca->reg_set |= (1 << bit);
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}
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}
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}
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/* Update the register file with the appropriate 4-bit code for one
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* bank or other. This can be used for timers, for levels, or for
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* initialization.
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*/
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static void set_code(struct tca6507_chip *tca, int reg, int bank, int new)
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{
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int mask = 0xF;
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int n;
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if (bank) {
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mask <<= 4;
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new <<= 4;
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}
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n = tca->reg_file[reg] & ~mask;
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n |= new;
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if (tca->reg_file[reg] != n) {
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tca->reg_file[reg] = n;
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tca->reg_set |= 1 << reg;
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}
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}
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/* Update brightness level. */
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static void set_level(struct tca6507_chip *tca, int bank, int level)
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{
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switch (bank) {
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case BANK0:
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case BANK1:
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set_code(tca, TCA6507_MAX_INTENSITY, bank, level);
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break;
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case MASTER:
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set_code(tca, TCA6507_MASTER_INTENSITY, 0, level);
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break;
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}
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tca->bank[bank].level = level;
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}
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/* Record all relevant time codes for a given bank */
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static void set_times(struct tca6507_chip *tca, int bank)
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{
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int c1, c2;
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int result;
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result = choose_times(tca->bank[bank].ontime, &c1, &c2);
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if (result < 0)
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return;
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dev_dbg(&tca->client->dev,
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"Chose on times %d(%d) %d(%d) for %dms\n",
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c1, time_codes[c1],
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c2, time_codes[c2], tca->bank[bank].ontime);
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set_code(tca, TCA6507_FADE_ON, bank, c2);
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set_code(tca, TCA6507_FULL_ON, bank, c1);
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tca->bank[bank].ontime = result;
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result = choose_times(tca->bank[bank].offtime, &c1, &c2);
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dev_dbg(&tca->client->dev,
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"Chose off times %d(%d) %d(%d) for %dms\n",
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c1, time_codes[c1],
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c2, time_codes[c2], tca->bank[bank].offtime);
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set_code(tca, TCA6507_FADE_OFF, bank, c2);
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set_code(tca, TCA6507_FIRST_OFF, bank, c1);
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set_code(tca, TCA6507_SECOND_OFF, bank, c1);
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tca->bank[bank].offtime = result;
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set_code(tca, TCA6507_INITIALIZE, bank, INIT_CODE);
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}
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/* Write all needed register of tca6507 */
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static void tca6507_work(struct work_struct *work)
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{
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struct tca6507_chip *tca = container_of(work, struct tca6507_chip,
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work);
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struct i2c_client *cl = tca->client;
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int set;
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u8 file[TCA6507_REG_CNT];
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int r;
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spin_lock_irq(&tca->lock);
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set = tca->reg_set;
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memcpy(file, tca->reg_file, TCA6507_REG_CNT);
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tca->reg_set = 0;
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spin_unlock_irq(&tca->lock);
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for (r = 0; r < TCA6507_REG_CNT; r++)
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if (set & (1<<r))
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i2c_smbus_write_byte_data(cl, r, file[r]);
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}
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static void led_release(struct tca6507_led *led)
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{
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/* If led owns any resource, release it. */
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struct tca6507_chip *tca = led->chip;
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if (led->bank >= 0) {
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struct bank *b = tca->bank + led->bank;
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if (led->blink)
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b->time_use--;
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b->level_use--;
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}
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led->blink = 0;
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led->bank = -1;
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}
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static int led_prepare(struct tca6507_led *led)
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{
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/* Assign this led to a bank, configuring that bank if
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* necessary. */
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int level = TO_LEVEL(led->led_cdev.brightness);
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struct tca6507_chip *tca = led->chip;
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int c1, c2;
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int i;
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struct bank *b;
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int need_init = 0;
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led->led_cdev.brightness = TO_BRIGHT(level);
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if (level == 0) {
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set_select(tca, led->num, TCA6507_LS_LED_OFF);
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return 0;
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}
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if (led->ontime == 0 || led->offtime == 0) {
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/*
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* Just set the brightness, choosing first usable
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* bank. If none perfect, choose best. Count
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* backwards so we check MASTER bank first to avoid
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* wasting a timer.
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*/
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int best = -1;/* full-on */
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int diff = 15-level;
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if (level == 15) {
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set_select(tca, led->num, TCA6507_LS_LED_ON);
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return 0;
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}
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for (i = MASTER; i >= BANK0; i--) {
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int d;
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if (tca->bank[i].level == level ||
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tca->bank[i].level_use == 0) {
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best = i;
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break;
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}
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d = abs(level - tca->bank[i].level);
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if (d < diff) {
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diff = d;
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best = i;
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}
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}
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if (best == -1) {
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/* Best brightness is full-on */
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set_select(tca, led->num, TCA6507_LS_LED_ON);
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led->led_cdev.brightness = LED_FULL;
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return 0;
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}
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if (!tca->bank[best].level_use)
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set_level(tca, best, level);
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tca->bank[best].level_use++;
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led->bank = best;
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set_select(tca, led->num, bank_source[best]);
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led->led_cdev.brightness = TO_BRIGHT(tca->bank[best].level);
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return 0;
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}
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/*
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* We have on/off time so we need to try to allocate a timing
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* bank. First check if times are compatible with hardware
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* and give up if not.
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*/
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if (choose_times(led->ontime, &c1, &c2) < 0)
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return -EINVAL;
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if (choose_times(led->offtime, &c1, &c2) < 0)
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return -EINVAL;
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for (i = BANK0; i <= BANK1; i++) {
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if (tca->bank[i].level_use == 0)
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/* not in use - it is ours! */
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break;
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if (tca->bank[i].level != level)
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/* Incompatible level - skip */
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/* FIX: if timer matches we maybe should consider
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* this anyway...
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*/
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continue;
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if (tca->bank[i].time_use == 0)
|
|
/* Timer not in use, and level matches - use it */
|
|
break;
|
|
|
|
if (!(tca->bank[i].on_dflt ||
|
|
led->on_dflt ||
|
|
tca->bank[i].ontime == led->ontime))
|
|
/* on time is incompatible */
|
|
continue;
|
|
|
|
if (!(tca->bank[i].off_dflt ||
|
|
led->off_dflt ||
|
|
tca->bank[i].offtime == led->offtime))
|
|
/* off time is incompatible */
|
|
continue;
|
|
|
|
/* looks like a suitable match */
|
|
break;
|
|
}
|
|
|
|
if (i > BANK1)
|
|
/* Nothing matches - how sad */
|
|
return -EINVAL;
|
|
|
|
b = &tca->bank[i];
|
|
if (b->level_use == 0)
|
|
set_level(tca, i, level);
|
|
b->level_use++;
|
|
led->bank = i;
|
|
|
|
if (b->on_dflt ||
|
|
!led->on_dflt ||
|
|
b->time_use == 0) {
|
|
b->ontime = led->ontime;
|
|
b->on_dflt = led->on_dflt;
|
|
need_init = 1;
|
|
}
|
|
|
|
if (b->off_dflt ||
|
|
!led->off_dflt ||
|
|
b->time_use == 0) {
|
|
b->offtime = led->offtime;
|
|
b->off_dflt = led->off_dflt;
|
|
need_init = 1;
|
|
}
|
|
|
|
if (need_init)
|
|
set_times(tca, i);
|
|
|
|
led->ontime = b->ontime;
|
|
led->offtime = b->offtime;
|
|
|
|
b->time_use++;
|
|
led->blink = 1;
|
|
led->led_cdev.brightness = TO_BRIGHT(b->level);
|
|
set_select(tca, led->num, blink_source[i]);
|
|
return 0;
|
|
}
|
|
|
|
static int led_assign(struct tca6507_led *led)
|
|
{
|
|
struct tca6507_chip *tca = led->chip;
|
|
int err;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&tca->lock, flags);
|
|
led_release(led);
|
|
err = led_prepare(led);
|
|
if (err) {
|
|
/*
|
|
* Can only fail on timer setup. In that case we need
|
|
* to re-establish as steady level.
|
|
*/
|
|
led->ontime = 0;
|
|
led->offtime = 0;
|
|
led_prepare(led);
|
|
}
|
|
spin_unlock_irqrestore(&tca->lock, flags);
|
|
|
|
if (tca->reg_set)
|
|
schedule_work(&tca->work);
|
|
return err;
|
|
}
|
|
|
|
static void tca6507_brightness_set(struct led_classdev *led_cdev,
|
|
enum led_brightness brightness)
|
|
{
|
|
struct tca6507_led *led = container_of(led_cdev, struct tca6507_led,
|
|
led_cdev);
|
|
led->led_cdev.brightness = brightness;
|
|
led->ontime = 0;
|
|
led->offtime = 0;
|
|
led_assign(led);
|
|
}
|
|
|
|
static int tca6507_blink_set(struct led_classdev *led_cdev,
|
|
unsigned long *delay_on,
|
|
unsigned long *delay_off)
|
|
{
|
|
struct tca6507_led *led = container_of(led_cdev, struct tca6507_led,
|
|
led_cdev);
|
|
|
|
if (*delay_on == 0)
|
|
led->on_dflt = 1;
|
|
else if (delay_on != &led_cdev->blink_delay_on)
|
|
led->on_dflt = 0;
|
|
led->ontime = *delay_on;
|
|
|
|
if (*delay_off == 0)
|
|
led->off_dflt = 1;
|
|
else if (delay_off != &led_cdev->blink_delay_off)
|
|
led->off_dflt = 0;
|
|
led->offtime = *delay_off;
|
|
|
|
if (led->ontime == 0)
|
|
led->ontime = 512;
|
|
if (led->offtime == 0)
|
|
led->offtime = 512;
|
|
|
|
if (led->led_cdev.brightness == LED_OFF)
|
|
led->led_cdev.brightness = LED_FULL;
|
|
if (led_assign(led) < 0) {
|
|
led->ontime = 0;
|
|
led->offtime = 0;
|
|
led->led_cdev.brightness = LED_OFF;
|
|
return -EINVAL;
|
|
}
|
|
*delay_on = led->ontime;
|
|
*delay_off = led->offtime;
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_GPIOLIB
|
|
static void tca6507_gpio_set_value(struct gpio_chip *gc,
|
|
unsigned offset, int val)
|
|
{
|
|
struct tca6507_chip *tca = gpiochip_get_data(gc);
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&tca->lock, flags);
|
|
/*
|
|
* 'OFF' is floating high, and 'ON' is pulled down, so it has
|
|
* the inverse sense of 'val'.
|
|
*/
|
|
set_select(tca, tca->gpio_map[offset],
|
|
val ? TCA6507_LS_LED_OFF : TCA6507_LS_LED_ON);
|
|
spin_unlock_irqrestore(&tca->lock, flags);
|
|
if (tca->reg_set)
|
|
schedule_work(&tca->work);
|
|
}
|
|
|
|
static int tca6507_gpio_direction_output(struct gpio_chip *gc,
|
|
unsigned offset, int val)
|
|
{
|
|
tca6507_gpio_set_value(gc, offset, val);
|
|
return 0;
|
|
}
|
|
|
|
static int tca6507_probe_gpios(struct i2c_client *client,
|
|
struct tca6507_chip *tca,
|
|
struct tca6507_platform_data *pdata)
|
|
{
|
|
int err;
|
|
int i = 0;
|
|
int gpios = 0;
|
|
|
|
for (i = 0; i < NUM_LEDS; i++)
|
|
if (pdata->leds.leds[i].name && pdata->leds.leds[i].flags) {
|
|
/* Configure as a gpio */
|
|
tca->gpio_name[gpios] = pdata->leds.leds[i].name;
|
|
tca->gpio_map[gpios] = i;
|
|
gpios++;
|
|
}
|
|
|
|
if (!gpios)
|
|
return 0;
|
|
|
|
tca->gpio.label = "gpio-tca6507";
|
|
tca->gpio.names = tca->gpio_name;
|
|
tca->gpio.ngpio = gpios;
|
|
tca->gpio.base = pdata->gpio_base;
|
|
tca->gpio.owner = THIS_MODULE;
|
|
tca->gpio.direction_output = tca6507_gpio_direction_output;
|
|
tca->gpio.set = tca6507_gpio_set_value;
|
|
tca->gpio.parent = &client->dev;
|
|
#ifdef CONFIG_OF_GPIO
|
|
tca->gpio.of_node = of_node_get(client->dev.of_node);
|
|
#endif
|
|
err = gpiochip_add_data(&tca->gpio, tca);
|
|
if (err) {
|
|
tca->gpio.ngpio = 0;
|
|
return err;
|
|
}
|
|
if (pdata->setup)
|
|
pdata->setup(tca->gpio.base, tca->gpio.ngpio);
|
|
return 0;
|
|
}
|
|
|
|
static void tca6507_remove_gpio(struct tca6507_chip *tca)
|
|
{
|
|
if (tca->gpio.ngpio)
|
|
gpiochip_remove(&tca->gpio);
|
|
}
|
|
#else /* CONFIG_GPIOLIB */
|
|
static int tca6507_probe_gpios(struct i2c_client *client,
|
|
struct tca6507_chip *tca,
|
|
struct tca6507_platform_data *pdata)
|
|
{
|
|
return 0;
|
|
}
|
|
static void tca6507_remove_gpio(struct tca6507_chip *tca)
|
|
{
|
|
}
|
|
#endif /* CONFIG_GPIOLIB */
|
|
|
|
#ifdef CONFIG_OF
|
|
static struct tca6507_platform_data *
|
|
tca6507_led_dt_init(struct i2c_client *client)
|
|
{
|
|
struct device_node *np = client->dev.of_node, *child;
|
|
struct tca6507_platform_data *pdata;
|
|
struct led_info *tca_leds;
|
|
int count;
|
|
|
|
count = of_get_child_count(np);
|
|
if (!count || count > NUM_LEDS)
|
|
return ERR_PTR(-ENODEV);
|
|
|
|
tca_leds = devm_kzalloc(&client->dev,
|
|
sizeof(struct led_info) * NUM_LEDS, GFP_KERNEL);
|
|
if (!tca_leds)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
for_each_child_of_node(np, child) {
|
|
struct led_info led;
|
|
u32 reg;
|
|
int ret;
|
|
|
|
led.name =
|
|
of_get_property(child, "label", NULL) ? : child->name;
|
|
led.default_trigger =
|
|
of_get_property(child, "linux,default-trigger", NULL);
|
|
led.flags = 0;
|
|
if (of_property_match_string(child, "compatible", "gpio") >= 0)
|
|
led.flags |= TCA6507_MAKE_GPIO;
|
|
ret = of_property_read_u32(child, "reg", ®);
|
|
if (ret != 0 || reg < 0 || reg >= NUM_LEDS)
|
|
continue;
|
|
|
|
tca_leds[reg] = led;
|
|
}
|
|
pdata = devm_kzalloc(&client->dev,
|
|
sizeof(struct tca6507_platform_data), GFP_KERNEL);
|
|
if (!pdata)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
pdata->leds.leds = tca_leds;
|
|
pdata->leds.num_leds = NUM_LEDS;
|
|
#ifdef CONFIG_GPIOLIB
|
|
pdata->gpio_base = -1;
|
|
#endif
|
|
return pdata;
|
|
}
|
|
|
|
static const struct of_device_id of_tca6507_leds_match[] = {
|
|
{ .compatible = "ti,tca6507", },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, of_tca6507_leds_match);
|
|
|
|
#else
|
|
static struct tca6507_platform_data *
|
|
tca6507_led_dt_init(struct i2c_client *client)
|
|
{
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
#endif
|
|
|
|
static int tca6507_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct tca6507_chip *tca;
|
|
struct i2c_adapter *adapter;
|
|
struct tca6507_platform_data *pdata;
|
|
int err;
|
|
int i = 0;
|
|
|
|
adapter = to_i2c_adapter(client->dev.parent);
|
|
pdata = dev_get_platdata(&client->dev);
|
|
|
|
if (!i2c_check_functionality(adapter, I2C_FUNC_I2C))
|
|
return -EIO;
|
|
|
|
if (!pdata || pdata->leds.num_leds != NUM_LEDS) {
|
|
pdata = tca6507_led_dt_init(client);
|
|
if (IS_ERR(pdata)) {
|
|
dev_err(&client->dev, "Need %d entries in platform-data list\n",
|
|
NUM_LEDS);
|
|
return PTR_ERR(pdata);
|
|
}
|
|
}
|
|
tca = devm_kzalloc(&client->dev, sizeof(*tca), GFP_KERNEL);
|
|
if (!tca)
|
|
return -ENOMEM;
|
|
|
|
tca->client = client;
|
|
INIT_WORK(&tca->work, tca6507_work);
|
|
spin_lock_init(&tca->lock);
|
|
i2c_set_clientdata(client, tca);
|
|
|
|
for (i = 0; i < NUM_LEDS; i++) {
|
|
struct tca6507_led *l = tca->leds + i;
|
|
|
|
l->chip = tca;
|
|
l->num = i;
|
|
if (pdata->leds.leds[i].name && !pdata->leds.leds[i].flags) {
|
|
l->led_cdev.name = pdata->leds.leds[i].name;
|
|
l->led_cdev.default_trigger
|
|
= pdata->leds.leds[i].default_trigger;
|
|
l->led_cdev.brightness_set = tca6507_brightness_set;
|
|
l->led_cdev.blink_set = tca6507_blink_set;
|
|
l->bank = -1;
|
|
err = led_classdev_register(&client->dev,
|
|
&l->led_cdev);
|
|
if (err < 0)
|
|
goto exit;
|
|
}
|
|
}
|
|
err = tca6507_probe_gpios(client, tca, pdata);
|
|
if (err)
|
|
goto exit;
|
|
/* set all registers to known state - zero */
|
|
tca->reg_set = 0x7f;
|
|
schedule_work(&tca->work);
|
|
|
|
return 0;
|
|
exit:
|
|
while (i--) {
|
|
if (tca->leds[i].led_cdev.name)
|
|
led_classdev_unregister(&tca->leds[i].led_cdev);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static int tca6507_remove(struct i2c_client *client)
|
|
{
|
|
int i;
|
|
struct tca6507_chip *tca = i2c_get_clientdata(client);
|
|
struct tca6507_led *tca_leds = tca->leds;
|
|
|
|
for (i = 0; i < NUM_LEDS; i++) {
|
|
if (tca_leds[i].led_cdev.name)
|
|
led_classdev_unregister(&tca_leds[i].led_cdev);
|
|
}
|
|
tca6507_remove_gpio(tca);
|
|
cancel_work_sync(&tca->work);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct i2c_driver tca6507_driver = {
|
|
.driver = {
|
|
.name = "leds-tca6507",
|
|
.of_match_table = of_match_ptr(of_tca6507_leds_match),
|
|
},
|
|
.probe = tca6507_probe,
|
|
.remove = tca6507_remove,
|
|
.id_table = tca6507_id,
|
|
};
|
|
|
|
module_i2c_driver(tca6507_driver);
|
|
|
|
MODULE_AUTHOR("NeilBrown <neilb@suse.de>");
|
|
MODULE_DESCRIPTION("TCA6507 LED/GPO driver");
|
|
MODULE_LICENSE("GPL v2");
|