1d2912cb1SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only
25054d39eSAntonio Ospite /*
35054d39eSAntonio Ospite * leds-lp3944.c - driver for National Semiconductor LP3944 Funlight Chip
45054d39eSAntonio Ospite *
55054d39eSAntonio Ospite * Copyright (C) 2009 Antonio Ospite <ospite@studenti.unina.it>
65054d39eSAntonio Ospite */
75054d39eSAntonio Ospite
85054d39eSAntonio Ospite /*
95054d39eSAntonio Ospite * I2C driver for National Semiconductor LP3944 Funlight Chip
105054d39eSAntonio Ospite * http://www.national.com/pf/LP/LP3944.html
115054d39eSAntonio Ospite *
125054d39eSAntonio Ospite * This helper chip can drive up to 8 leds, with two programmable DIM modes;
135054d39eSAntonio Ospite * it could even be used as a gpio expander but this driver assumes it is used
145054d39eSAntonio Ospite * as a led controller.
155054d39eSAntonio Ospite *
165054d39eSAntonio Ospite * The DIM modes are used to set _blink_ patterns for leds, the pattern is
175054d39eSAntonio Ospite * specified supplying two parameters:
185054d39eSAntonio Ospite * - period: from 0s to 1.6s
195054d39eSAntonio Ospite * - duty cycle: percentage of the period the led is on, from 0 to 100
205054d39eSAntonio Ospite *
215054d39eSAntonio Ospite * LP3944 can be found on Motorola A910 smartphone, where it drives the rgb
225054d39eSAntonio Ospite * leds, the camera flash light and the displays backlights.
235054d39eSAntonio Ospite */
245054d39eSAntonio Ospite
255054d39eSAntonio Ospite #include <linux/module.h>
265054d39eSAntonio Ospite #include <linux/i2c.h>
275a0e3ad6STejun Heo #include <linux/slab.h>
285054d39eSAntonio Ospite #include <linux/leds.h>
295054d39eSAntonio Ospite #include <linux/mutex.h>
305054d39eSAntonio Ospite #include <linux/leds-lp3944.h>
315054d39eSAntonio Ospite
325054d39eSAntonio Ospite /* Read Only Registers */
335054d39eSAntonio Ospite #define LP3944_REG_INPUT1 0x00 /* LEDs 0-7 InputRegister (Read Only) */
345054d39eSAntonio Ospite #define LP3944_REG_REGISTER1 0x01 /* None (Read Only) */
355054d39eSAntonio Ospite
365054d39eSAntonio Ospite #define LP3944_REG_PSC0 0x02 /* Frequency Prescaler 0 (R/W) */
375054d39eSAntonio Ospite #define LP3944_REG_PWM0 0x03 /* PWM Register 0 (R/W) */
385054d39eSAntonio Ospite #define LP3944_REG_PSC1 0x04 /* Frequency Prescaler 1 (R/W) */
395054d39eSAntonio Ospite #define LP3944_REG_PWM1 0x05 /* PWM Register 1 (R/W) */
405054d39eSAntonio Ospite #define LP3944_REG_LS0 0x06 /* LEDs 0-3 Selector (R/W) */
415054d39eSAntonio Ospite #define LP3944_REG_LS1 0x07 /* LEDs 4-7 Selector (R/W) */
425054d39eSAntonio Ospite
435054d39eSAntonio Ospite /* These registers are not used to control leds in LP3944, they can store
445054d39eSAntonio Ospite * arbitrary values which the chip will ignore.
455054d39eSAntonio Ospite */
465054d39eSAntonio Ospite #define LP3944_REG_REGISTER8 0x08
475054d39eSAntonio Ospite #define LP3944_REG_REGISTER9 0x09
485054d39eSAntonio Ospite
495054d39eSAntonio Ospite #define LP3944_DIM0 0
505054d39eSAntonio Ospite #define LP3944_DIM1 1
515054d39eSAntonio Ospite
525054d39eSAntonio Ospite /* period in ms */
535054d39eSAntonio Ospite #define LP3944_PERIOD_MIN 0
545054d39eSAntonio Ospite #define LP3944_PERIOD_MAX 1600
555054d39eSAntonio Ospite
565054d39eSAntonio Ospite /* duty cycle is a percentage */
575054d39eSAntonio Ospite #define LP3944_DUTY_CYCLE_MIN 0
585054d39eSAntonio Ospite #define LP3944_DUTY_CYCLE_MAX 100
595054d39eSAntonio Ospite
605054d39eSAntonio Ospite #define ldev_to_led(c) container_of(c, struct lp3944_led_data, ldev)
615054d39eSAntonio Ospite
625054d39eSAntonio Ospite /* Saved data */
635054d39eSAntonio Ospite struct lp3944_led_data {
645054d39eSAntonio Ospite u8 id;
655054d39eSAntonio Ospite enum lp3944_type type;
665054d39eSAntonio Ospite struct led_classdev ldev;
675054d39eSAntonio Ospite struct i2c_client *client;
685054d39eSAntonio Ospite };
695054d39eSAntonio Ospite
705054d39eSAntonio Ospite struct lp3944_data {
715054d39eSAntonio Ospite struct mutex lock;
725054d39eSAntonio Ospite struct i2c_client *client;
735054d39eSAntonio Ospite struct lp3944_led_data leds[LP3944_LEDS_MAX];
745054d39eSAntonio Ospite };
755054d39eSAntonio Ospite
lp3944_reg_read(struct i2c_client * client,u8 reg,u8 * value)765054d39eSAntonio Ospite static int lp3944_reg_read(struct i2c_client *client, u8 reg, u8 *value)
775054d39eSAntonio Ospite {
785054d39eSAntonio Ospite int tmp;
795054d39eSAntonio Ospite
805054d39eSAntonio Ospite tmp = i2c_smbus_read_byte_data(client, reg);
815054d39eSAntonio Ospite if (tmp < 0)
824401e487SSachin Kamat return tmp;
835054d39eSAntonio Ospite
845054d39eSAntonio Ospite *value = tmp;
855054d39eSAntonio Ospite
865054d39eSAntonio Ospite return 0;
875054d39eSAntonio Ospite }
885054d39eSAntonio Ospite
lp3944_reg_write(struct i2c_client * client,u8 reg,u8 value)895054d39eSAntonio Ospite static int lp3944_reg_write(struct i2c_client *client, u8 reg, u8 value)
905054d39eSAntonio Ospite {
915054d39eSAntonio Ospite return i2c_smbus_write_byte_data(client, reg, value);
925054d39eSAntonio Ospite }
935054d39eSAntonio Ospite
945054d39eSAntonio Ospite /**
959933bde2SLee Jones * lp3944_dim_set_period() - Set the period for DIM status
965054d39eSAntonio Ospite *
975054d39eSAntonio Ospite * @client: the i2c client
985054d39eSAntonio Ospite * @dim: either LP3944_DIM0 or LP3944_DIM1
995054d39eSAntonio Ospite * @period: period of a blink, that is a on/off cycle, expressed in ms.
1005054d39eSAntonio Ospite */
lp3944_dim_set_period(struct i2c_client * client,u8 dim,u16 period)1015054d39eSAntonio Ospite static int lp3944_dim_set_period(struct i2c_client *client, u8 dim, u16 period)
1025054d39eSAntonio Ospite {
1035054d39eSAntonio Ospite u8 psc_reg;
1045054d39eSAntonio Ospite u8 psc_value;
1055054d39eSAntonio Ospite int err;
1065054d39eSAntonio Ospite
1075054d39eSAntonio Ospite if (dim == LP3944_DIM0)
1085054d39eSAntonio Ospite psc_reg = LP3944_REG_PSC0;
1095054d39eSAntonio Ospite else if (dim == LP3944_DIM1)
1105054d39eSAntonio Ospite psc_reg = LP3944_REG_PSC1;
1115054d39eSAntonio Ospite else
1125054d39eSAntonio Ospite return -EINVAL;
1135054d39eSAntonio Ospite
1145054d39eSAntonio Ospite /* Convert period to Prescaler value */
1155054d39eSAntonio Ospite if (period > LP3944_PERIOD_MAX)
1165054d39eSAntonio Ospite return -EINVAL;
1175054d39eSAntonio Ospite
1185054d39eSAntonio Ospite psc_value = (period * 255) / LP3944_PERIOD_MAX;
1195054d39eSAntonio Ospite
1205054d39eSAntonio Ospite err = lp3944_reg_write(client, psc_reg, psc_value);
1215054d39eSAntonio Ospite
1225054d39eSAntonio Ospite return err;
1235054d39eSAntonio Ospite }
1245054d39eSAntonio Ospite
1255054d39eSAntonio Ospite /**
1269933bde2SLee Jones * lp3944_dim_set_dutycycle - Set the duty cycle for DIM status
1275054d39eSAntonio Ospite *
1285054d39eSAntonio Ospite * @client: the i2c client
1295054d39eSAntonio Ospite * @dim: either LP3944_DIM0 or LP3944_DIM1
1305054d39eSAntonio Ospite * @duty_cycle: percentage of a period during which a led is ON
1315054d39eSAntonio Ospite */
lp3944_dim_set_dutycycle(struct i2c_client * client,u8 dim,u8 duty_cycle)1325054d39eSAntonio Ospite static int lp3944_dim_set_dutycycle(struct i2c_client *client, u8 dim,
1335054d39eSAntonio Ospite u8 duty_cycle)
1345054d39eSAntonio Ospite {
1355054d39eSAntonio Ospite u8 pwm_reg;
1365054d39eSAntonio Ospite u8 pwm_value;
1375054d39eSAntonio Ospite int err;
1385054d39eSAntonio Ospite
1395054d39eSAntonio Ospite if (dim == LP3944_DIM0)
1405054d39eSAntonio Ospite pwm_reg = LP3944_REG_PWM0;
1415054d39eSAntonio Ospite else if (dim == LP3944_DIM1)
1425054d39eSAntonio Ospite pwm_reg = LP3944_REG_PWM1;
1435054d39eSAntonio Ospite else
1445054d39eSAntonio Ospite return -EINVAL;
1455054d39eSAntonio Ospite
1465054d39eSAntonio Ospite /* Convert duty cycle to PWM value */
1475054d39eSAntonio Ospite if (duty_cycle > LP3944_DUTY_CYCLE_MAX)
1485054d39eSAntonio Ospite return -EINVAL;
1495054d39eSAntonio Ospite
1505054d39eSAntonio Ospite pwm_value = (duty_cycle * 255) / LP3944_DUTY_CYCLE_MAX;
1515054d39eSAntonio Ospite
1525054d39eSAntonio Ospite err = lp3944_reg_write(client, pwm_reg, pwm_value);
1535054d39eSAntonio Ospite
1545054d39eSAntonio Ospite return err;
1555054d39eSAntonio Ospite }
1565054d39eSAntonio Ospite
1575054d39eSAntonio Ospite /**
1589933bde2SLee Jones * lp3944_led_set() - Set the led status
1595054d39eSAntonio Ospite *
1605054d39eSAntonio Ospite * @led: a lp3944_led_data structure
1615054d39eSAntonio Ospite * @status: one of LP3944_LED_STATUS_OFF
1625054d39eSAntonio Ospite * LP3944_LED_STATUS_ON
1635054d39eSAntonio Ospite * LP3944_LED_STATUS_DIM0
1645054d39eSAntonio Ospite * LP3944_LED_STATUS_DIM1
1655054d39eSAntonio Ospite */
lp3944_led_set(struct lp3944_led_data * led,u8 status)1665054d39eSAntonio Ospite static int lp3944_led_set(struct lp3944_led_data *led, u8 status)
1675054d39eSAntonio Ospite {
1685054d39eSAntonio Ospite struct lp3944_data *data = i2c_get_clientdata(led->client);
1695054d39eSAntonio Ospite u8 id = led->id;
1705054d39eSAntonio Ospite u8 reg;
1715054d39eSAntonio Ospite u8 val = 0;
1725054d39eSAntonio Ospite int err;
1735054d39eSAntonio Ospite
1745054d39eSAntonio Ospite dev_dbg(&led->client->dev, "%s: %s, status before normalization:%d\n",
1755054d39eSAntonio Ospite __func__, led->ldev.name, status);
1765054d39eSAntonio Ospite
1775054d39eSAntonio Ospite switch (id) {
1785054d39eSAntonio Ospite case LP3944_LED0:
1795054d39eSAntonio Ospite case LP3944_LED1:
1805054d39eSAntonio Ospite case LP3944_LED2:
1815054d39eSAntonio Ospite case LP3944_LED3:
1825054d39eSAntonio Ospite reg = LP3944_REG_LS0;
1835054d39eSAntonio Ospite break;
1845054d39eSAntonio Ospite case LP3944_LED4:
1855054d39eSAntonio Ospite case LP3944_LED5:
1865054d39eSAntonio Ospite case LP3944_LED6:
1875054d39eSAntonio Ospite case LP3944_LED7:
1885054d39eSAntonio Ospite id -= LP3944_LED4;
1895054d39eSAntonio Ospite reg = LP3944_REG_LS1;
1905054d39eSAntonio Ospite break;
1915054d39eSAntonio Ospite default:
1925054d39eSAntonio Ospite return -EINVAL;
1935054d39eSAntonio Ospite }
1945054d39eSAntonio Ospite
1955054d39eSAntonio Ospite if (status > LP3944_LED_STATUS_DIM1)
1965054d39eSAntonio Ospite return -EINVAL;
1975054d39eSAntonio Ospite
198c9eec908SAntonio Ospite /*
199c9eec908SAntonio Ospite * Invert status only when it's < 2 (i.e. 0 or 1) which means it's
200c9eec908SAntonio Ospite * controlling the on/off state directly.
201c9eec908SAntonio Ospite * When, instead, status is >= 2 don't invert it because it would mean
202c9eec908SAntonio Ospite * to mess with the hardware blinking mode.
2035054d39eSAntonio Ospite */
2045054d39eSAntonio Ospite if (led->type == LP3944_LED_TYPE_LED_INVERTED && status < 2)
2055054d39eSAntonio Ospite status = 1 - status;
2065054d39eSAntonio Ospite
2075054d39eSAntonio Ospite mutex_lock(&data->lock);
2085054d39eSAntonio Ospite lp3944_reg_read(led->client, reg, &val);
2095054d39eSAntonio Ospite
2105054d39eSAntonio Ospite val &= ~(LP3944_LED_STATUS_MASK << (id << 1));
2115054d39eSAntonio Ospite val |= (status << (id << 1));
2125054d39eSAntonio Ospite
2135054d39eSAntonio Ospite dev_dbg(&led->client->dev, "%s: %s, reg:%d id:%d status:%d val:%#x\n",
2145054d39eSAntonio Ospite __func__, led->ldev.name, reg, id, status, val);
2155054d39eSAntonio Ospite
2165054d39eSAntonio Ospite /* set led status */
2175054d39eSAntonio Ospite err = lp3944_reg_write(led->client, reg, val);
2185054d39eSAntonio Ospite mutex_unlock(&data->lock);
2195054d39eSAntonio Ospite
2205054d39eSAntonio Ospite return err;
2215054d39eSAntonio Ospite }
2225054d39eSAntonio Ospite
lp3944_led_set_blink(struct led_classdev * led_cdev,unsigned long * delay_on,unsigned long * delay_off)2235054d39eSAntonio Ospite static int lp3944_led_set_blink(struct led_classdev *led_cdev,
2245054d39eSAntonio Ospite unsigned long *delay_on,
2255054d39eSAntonio Ospite unsigned long *delay_off)
2265054d39eSAntonio Ospite {
2275054d39eSAntonio Ospite struct lp3944_led_data *led = ldev_to_led(led_cdev);
2285054d39eSAntonio Ospite u16 period;
2295054d39eSAntonio Ospite u8 duty_cycle;
2305054d39eSAntonio Ospite int err;
2315054d39eSAntonio Ospite
2325054d39eSAntonio Ospite /* units are in ms */
2335054d39eSAntonio Ospite if (*delay_on + *delay_off > LP3944_PERIOD_MAX)
2345054d39eSAntonio Ospite return -EINVAL;
2355054d39eSAntonio Ospite
2365054d39eSAntonio Ospite if (*delay_on == 0 && *delay_off == 0) {
2375054d39eSAntonio Ospite /* Special case: the leds subsystem requires a default user
2385054d39eSAntonio Ospite * friendly blink pattern for the LED. Let's blink the led
2395054d39eSAntonio Ospite * slowly (1Hz).
2405054d39eSAntonio Ospite */
2415054d39eSAntonio Ospite *delay_on = 500;
2425054d39eSAntonio Ospite *delay_off = 500;
2435054d39eSAntonio Ospite }
2445054d39eSAntonio Ospite
2455054d39eSAntonio Ospite period = (*delay_on) + (*delay_off);
2465054d39eSAntonio Ospite
2475054d39eSAntonio Ospite /* duty_cycle is the percentage of period during which the led is ON */
2485054d39eSAntonio Ospite duty_cycle = 100 * (*delay_on) / period;
2495054d39eSAntonio Ospite
2505054d39eSAntonio Ospite /* invert duty cycle for inverted leds, this has the same effect of
2515054d39eSAntonio Ospite * swapping delay_on and delay_off
2525054d39eSAntonio Ospite */
2535054d39eSAntonio Ospite if (led->type == LP3944_LED_TYPE_LED_INVERTED)
2545054d39eSAntonio Ospite duty_cycle = 100 - duty_cycle;
2555054d39eSAntonio Ospite
2565054d39eSAntonio Ospite /* NOTE: using always the first DIM mode, this means that all leds
2575054d39eSAntonio Ospite * will have the same blinking pattern.
2585054d39eSAntonio Ospite *
2595054d39eSAntonio Ospite * We could find a way later to have two leds blinking in hardware
2605054d39eSAntonio Ospite * with different patterns at the same time, falling back to software
2615054d39eSAntonio Ospite * control for the other ones.
2625054d39eSAntonio Ospite */
2635054d39eSAntonio Ospite err = lp3944_dim_set_period(led->client, LP3944_DIM0, period);
2645054d39eSAntonio Ospite if (err)
2655054d39eSAntonio Ospite return err;
2665054d39eSAntonio Ospite
2675054d39eSAntonio Ospite err = lp3944_dim_set_dutycycle(led->client, LP3944_DIM0, duty_cycle);
2685054d39eSAntonio Ospite if (err)
2695054d39eSAntonio Ospite return err;
2705054d39eSAntonio Ospite
2715054d39eSAntonio Ospite dev_dbg(&led->client->dev, "%s: OK hardware accelerated blink!\n",
2725054d39eSAntonio Ospite __func__);
2735054d39eSAntonio Ospite
274525d6a65SAndrew Lunn lp3944_led_set(led, LP3944_LED_STATUS_DIM0);
2755054d39eSAntonio Ospite
2765054d39eSAntonio Ospite return 0;
2775054d39eSAntonio Ospite }
2785054d39eSAntonio Ospite
lp3944_led_set_brightness(struct led_classdev * led_cdev,enum led_brightness brightness)279525d6a65SAndrew Lunn static int lp3944_led_set_brightness(struct led_classdev *led_cdev,
2805054d39eSAntonio Ospite enum led_brightness brightness)
2815054d39eSAntonio Ospite {
2825054d39eSAntonio Ospite struct lp3944_led_data *led = ldev_to_led(led_cdev);
2835054d39eSAntonio Ospite
2845054d39eSAntonio Ospite dev_dbg(&led->client->dev, "%s: %s, %d\n",
2855054d39eSAntonio Ospite __func__, led_cdev->name, brightness);
2865054d39eSAntonio Ospite
287525d6a65SAndrew Lunn return lp3944_led_set(led, !!brightness);
2885054d39eSAntonio Ospite }
2895054d39eSAntonio Ospite
lp3944_configure(struct i2c_client * client,struct lp3944_data * data,struct lp3944_platform_data * pdata)2905054d39eSAntonio Ospite static int lp3944_configure(struct i2c_client *client,
2915054d39eSAntonio Ospite struct lp3944_data *data,
2925054d39eSAntonio Ospite struct lp3944_platform_data *pdata)
2935054d39eSAntonio Ospite {
2945054d39eSAntonio Ospite int i, err = 0;
2955054d39eSAntonio Ospite
2965054d39eSAntonio Ospite for (i = 0; i < pdata->leds_size; i++) {
2975054d39eSAntonio Ospite struct lp3944_led *pled = &pdata->leds[i];
2985054d39eSAntonio Ospite struct lp3944_led_data *led = &data->leds[i];
2995054d39eSAntonio Ospite led->client = client;
3005054d39eSAntonio Ospite led->id = i;
3015054d39eSAntonio Ospite
3025054d39eSAntonio Ospite switch (pled->type) {
3035054d39eSAntonio Ospite
3045054d39eSAntonio Ospite case LP3944_LED_TYPE_LED:
3055054d39eSAntonio Ospite case LP3944_LED_TYPE_LED_INVERTED:
3065054d39eSAntonio Ospite led->type = pled->type;
3075054d39eSAntonio Ospite led->ldev.name = pled->name;
3085054d39eSAntonio Ospite led->ldev.max_brightness = 1;
309525d6a65SAndrew Lunn led->ldev.brightness_set_blocking =
310525d6a65SAndrew Lunn lp3944_led_set_brightness;
3115054d39eSAntonio Ospite led->ldev.blink_set = lp3944_led_set_blink;
3125054d39eSAntonio Ospite led->ldev.flags = LED_CORE_SUSPENDRESUME;
3135054d39eSAntonio Ospite
3145054d39eSAntonio Ospite err = led_classdev_register(&client->dev, &led->ldev);
3155054d39eSAntonio Ospite if (err < 0) {
3165054d39eSAntonio Ospite dev_err(&client->dev,
3175054d39eSAntonio Ospite "couldn't register LED %s\n",
3185054d39eSAntonio Ospite led->ldev.name);
3195054d39eSAntonio Ospite goto exit;
3205054d39eSAntonio Ospite }
3215054d39eSAntonio Ospite
3225054d39eSAntonio Ospite /* to expose the default value to userspace */
3237f14e6b9SJacek Anaszewski led->ldev.brightness =
324525d6a65SAndrew Lunn (enum led_brightness) pled->status;
3255054d39eSAntonio Ospite
3265054d39eSAntonio Ospite /* Set the default led status */
327525d6a65SAndrew Lunn err = lp3944_led_set(led, pled->status);
3285054d39eSAntonio Ospite if (err < 0) {
3295054d39eSAntonio Ospite dev_err(&client->dev,
3305054d39eSAntonio Ospite "%s couldn't set STATUS %d\n",
331525d6a65SAndrew Lunn led->ldev.name, pled->status);
3325054d39eSAntonio Ospite goto exit;
3335054d39eSAntonio Ospite }
3345054d39eSAntonio Ospite break;
3355054d39eSAntonio Ospite
3365054d39eSAntonio Ospite case LP3944_LED_TYPE_NONE:
3375054d39eSAntonio Ospite default:
3385054d39eSAntonio Ospite break;
3395054d39eSAntonio Ospite
3405054d39eSAntonio Ospite }
3415054d39eSAntonio Ospite }
3425054d39eSAntonio Ospite return 0;
3435054d39eSAntonio Ospite
3445054d39eSAntonio Ospite exit:
3455054d39eSAntonio Ospite if (i > 0)
3465054d39eSAntonio Ospite for (i = i - 1; i >= 0; i--)
3475054d39eSAntonio Ospite switch (pdata->leds[i].type) {
3485054d39eSAntonio Ospite
3495054d39eSAntonio Ospite case LP3944_LED_TYPE_LED:
3505054d39eSAntonio Ospite case LP3944_LED_TYPE_LED_INVERTED:
3515054d39eSAntonio Ospite led_classdev_unregister(&data->leds[i].ldev);
3525054d39eSAntonio Ospite break;
3535054d39eSAntonio Ospite
3545054d39eSAntonio Ospite case LP3944_LED_TYPE_NONE:
3555054d39eSAntonio Ospite default:
3565054d39eSAntonio Ospite break;
3575054d39eSAntonio Ospite }
3585054d39eSAntonio Ospite
3595054d39eSAntonio Ospite return err;
3605054d39eSAntonio Ospite }
3615054d39eSAntonio Ospite
lp3944_probe(struct i2c_client * client)3621ba59160SUwe Kleine-König static int lp3944_probe(struct i2c_client *client)
3635054d39eSAntonio Ospite {
36487aae1eaSJingoo Han struct lp3944_platform_data *lp3944_pdata =
36587aae1eaSJingoo Han dev_get_platdata(&client->dev);
3665054d39eSAntonio Ospite struct lp3944_data *data;
3677e1ce34fSAxel Lin int err;
3685054d39eSAntonio Ospite
3695054d39eSAntonio Ospite if (lp3944_pdata == NULL) {
3705054d39eSAntonio Ospite dev_err(&client->dev, "no platform data\n");
3715054d39eSAntonio Ospite return -EINVAL;
3725054d39eSAntonio Ospite }
3735054d39eSAntonio Ospite
3745054d39eSAntonio Ospite /* Let's see whether this adapter can support what we need. */
3755054d39eSAntonio Ospite if (!i2c_check_functionality(client->adapter,
3765054d39eSAntonio Ospite I2C_FUNC_SMBUS_BYTE_DATA)) {
3775054d39eSAntonio Ospite dev_err(&client->dev, "insufficient functionality!\n");
3785054d39eSAntonio Ospite return -ENODEV;
3795054d39eSAntonio Ospite }
3805054d39eSAntonio Ospite
3819813d74fSBryan Wu data = devm_kzalloc(&client->dev, sizeof(struct lp3944_data),
3829813d74fSBryan Wu GFP_KERNEL);
3835054d39eSAntonio Ospite if (!data)
3845054d39eSAntonio Ospite return -ENOMEM;
3855054d39eSAntonio Ospite
3865054d39eSAntonio Ospite data->client = client;
3875054d39eSAntonio Ospite i2c_set_clientdata(client, data);
3885054d39eSAntonio Ospite
3895054d39eSAntonio Ospite mutex_init(&data->lock);
3905054d39eSAntonio Ospite
3917e1ce34fSAxel Lin err = lp3944_configure(client, data, lp3944_pdata);
3929813d74fSBryan Wu if (err < 0)
3937e1ce34fSAxel Lin return err;
3945054d39eSAntonio Ospite
3957e1ce34fSAxel Lin dev_info(&client->dev, "lp3944 enabled\n");
3965054d39eSAntonio Ospite return 0;
3975054d39eSAntonio Ospite }
3985054d39eSAntonio Ospite
lp3944_remove(struct i2c_client * client)399ed5c2f5fSUwe Kleine-König static void lp3944_remove(struct i2c_client *client)
4005054d39eSAntonio Ospite {
40187aae1eaSJingoo Han struct lp3944_platform_data *pdata = dev_get_platdata(&client->dev);
4025054d39eSAntonio Ospite struct lp3944_data *data = i2c_get_clientdata(client);
4035054d39eSAntonio Ospite int i;
4045054d39eSAntonio Ospite
4055054d39eSAntonio Ospite for (i = 0; i < pdata->leds_size; i++)
4065054d39eSAntonio Ospite switch (data->leds[i].type) {
4075054d39eSAntonio Ospite case LP3944_LED_TYPE_LED:
4085054d39eSAntonio Ospite case LP3944_LED_TYPE_LED_INVERTED:
4095054d39eSAntonio Ospite led_classdev_unregister(&data->leds[i].ldev);
4105054d39eSAntonio Ospite break;
4115054d39eSAntonio Ospite
4125054d39eSAntonio Ospite case LP3944_LED_TYPE_NONE:
4135054d39eSAntonio Ospite default:
4145054d39eSAntonio Ospite break;
4155054d39eSAntonio Ospite }
4165054d39eSAntonio Ospite }
4175054d39eSAntonio Ospite
4185054d39eSAntonio Ospite /* lp3944 i2c driver struct */
4195054d39eSAntonio Ospite static const struct i2c_device_id lp3944_id[] = {
4205054d39eSAntonio Ospite {"lp3944", 0},
4215054d39eSAntonio Ospite {}
4225054d39eSAntonio Ospite };
4235054d39eSAntonio Ospite
4245054d39eSAntonio Ospite MODULE_DEVICE_TABLE(i2c, lp3944_id);
4255054d39eSAntonio Ospite
4265054d39eSAntonio Ospite static struct i2c_driver lp3944_driver = {
4275054d39eSAntonio Ospite .driver = {
4285054d39eSAntonio Ospite .name = "lp3944",
4295054d39eSAntonio Ospite },
430*d9ff8a8eSUwe Kleine-König .probe = lp3944_probe,
431df07cf81SBill Pemberton .remove = lp3944_remove,
4325054d39eSAntonio Ospite .id_table = lp3944_id,
4335054d39eSAntonio Ospite };
4345054d39eSAntonio Ospite
43509a0d183SAxel Lin module_i2c_driver(lp3944_driver);
4365054d39eSAntonio Ospite
4375054d39eSAntonio Ospite MODULE_AUTHOR("Antonio Ospite <ospite@studenti.unina.it>");
4385054d39eSAntonio Ospite MODULE_DESCRIPTION("LP3944 Fun Light Chip");
4395054d39eSAntonio Ospite MODULE_LICENSE("GPL");
440