diff options
Diffstat (limited to 'drivers/leds/leds-mc13783.c')
| -rw-r--r-- | drivers/leds/leds-mc13783.c | 403 |
1 files changed, 403 insertions, 0 deletions
diff --git a/drivers/leds/leds-mc13783.c b/drivers/leds/leds-mc13783.c new file mode 100644 index 0000000..f05bb08 --- /dev/null +++ b/drivers/leds/leds-mc13783.c @@ -0,0 +1,403 @@ +/* + * LEDs driver for Freescale MC13783 + * + * Copyright (C) 2010 Philippe Rétornaz + * + * Based on leds-da903x: + * Copyright (C) 2008 Compulab, Ltd. + * Mike Rapoport <mike@compulab.co.il> + * + * Copyright (C) 2006-2008 Marvell International Ltd. + * Eric Miao <eric.miao@marvell.com> + * + * 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/module.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/platform_device.h> +#include <linux/leds.h> +#include <linux/workqueue.h> +#include <linux/mfd/mc13783.h> +#include <linux/slab.h> + +struct mc13783_led { + struct led_classdev cdev; + struct work_struct work; + struct mc13783 *master; + enum led_brightness new_brightness; + int id; +}; + +#define MC13783_REG_LED_CONTROL_0 51 +#define MC13783_LED_C0_ENABLE_BIT (1 << 0) +#define MC13783_LED_C0_TRIODE_MD_BIT (1 << 7) +#define MC13783_LED_C0_TRIODE_AD_BIT (1 << 8) +#define MC13783_LED_C0_TRIODE_KP_BIT (1 << 9) +#define MC13783_LED_C0_BOOST_BIT (1 << 10) +#define MC13783_LED_C0_ABMODE_MASK 0x7 +#define MC13783_LED_C0_ABMODE 11 +#define MC13783_LED_C0_ABREF_MASK 0x3 +#define MC13783_LED_C0_ABREF 14 + +#define MC13783_REG_LED_CONTROL_1 52 +#define MC13783_LED_C1_TC1HALF_BIT (1 << 18) + +#define MC13783_REG_LED_CONTROL_2 53 +#define MC13783_LED_C2_BL_P_MASK 0xf +#define MC13783_LED_C2_MD_P 9 +#define MC13783_LED_C2_AD_P 13 +#define MC13783_LED_C2_KP_P 17 +#define MC13783_LED_C2_BL_C_MASK 0x7 +#define MC13783_LED_C2_MD_C 0 +#define MC13783_LED_C2_AD_C 3 +#define MC13783_LED_C2_KP_C 6 + +#define MC13783_REG_LED_CONTROL_3 54 +#define MC13783_LED_C3_TC_P 6 +#define MC13783_LED_C3_TC_P_MASK 0x1f + +#define MC13783_REG_LED_CONTROL_4 55 +#define MC13783_REG_LED_CONTROL_5 56 + +#define MC13783_LED_Cx_PERIOD 21 +#define MC13783_LED_Cx_PERIOD_MASK 0x3 +#define MC13783_LED_Cx_SLEWLIM_BIT (1 << 23) +#define MC13783_LED_Cx_TRIODE_TC_BIT (1 << 23) +#define MC13783_LED_Cx_TC_C_MASK 0x3 + +static void mc13783_led_work(struct work_struct *work) +{ + struct mc13783_led *led = container_of(work, struct mc13783_led, work); + int reg = 0; + int mask = 0; + int value = 0; + int bank, off, shift; + + switch (led->id) { + case MC13783_LED_MD: + reg = MC13783_REG_LED_CONTROL_2; + mask = MC13783_LED_C2_BL_P_MASK << MC13783_LED_C2_MD_P; + value = (led->new_brightness >> 4) << MC13783_LED_C2_MD_P; + break; + case MC13783_LED_AD: + reg = MC13783_REG_LED_CONTROL_2; + mask = MC13783_LED_C2_BL_P_MASK << MC13783_LED_C2_AD_P; + value = (led->new_brightness >> 4) << MC13783_LED_C2_AD_P; + break; + case MC13783_LED_KP: + reg = MC13783_REG_LED_CONTROL_2; + mask = MC13783_LED_C2_BL_P_MASK << MC13783_LED_C2_KP_P; + value = (led->new_brightness >> 4) << MC13783_LED_C2_KP_P; + break; + case MC13783_LED_R1: + case MC13783_LED_G1: + case MC13783_LED_B1: + case MC13783_LED_R2: + case MC13783_LED_G2: + case MC13783_LED_B2: + case MC13783_LED_R3: + case MC13783_LED_G3: + case MC13783_LED_B3: + off = led->id - MC13783_LED_R1; + bank = off/3; + reg = MC13783_REG_LED_CONTROL_3 + off/3; + shift = (off - bank * 3) * 5 + MC13783_LED_C3_TC_P; + value = (led->new_brightness >> 3) << shift; + mask = MC13783_LED_C3_TC_P_MASK << shift; + break; + } + + mc13783_lock(led->master); + + mc13783_reg_rmw(led->master, reg, mask, value); + + mc13783_unlock(led->master); +} + +static void mc13783_led_set(struct led_classdev *led_cdev, + enum led_brightness value) +{ + struct mc13783_led *led; + + led = container_of(led_cdev, struct mc13783_led, cdev); + led->new_brightness = value; + schedule_work(&led->work); +} + +static int __devinit mc13783_led_setup(struct mc13783_led *led, int max_current) +{ + int shift = 0; + int mask = 0; + int value = 0; + int reg = 0; + int ret, bank; + + switch (led->id) { + case MC13783_LED_MD: + shift = MC13783_LED_C2_MD_C; + mask = MC13783_LED_C2_BL_C_MASK; + value = max_current & MC13783_LED_C2_BL_C_MASK; + reg = MC13783_REG_LED_CONTROL_2; + break; + case MC13783_LED_AD: + shift = MC13783_LED_C2_AD_C; + mask = MC13783_LED_C2_BL_C_MASK; + value = max_current & MC13783_LED_C2_BL_C_MASK; + reg = MC13783_REG_LED_CONTROL_2; + break; + case MC13783_LED_KP: + shift = MC13783_LED_C2_KP_C; + mask = MC13783_LED_C2_BL_C_MASK; + value = max_current & MC13783_LED_C2_BL_C_MASK; + reg = MC13783_REG_LED_CONTROL_2; + break; + case MC13783_LED_R1: + case MC13783_LED_G1: + case MC13783_LED_B1: + case MC13783_LED_R2: + case MC13783_LED_G2: + case MC13783_LED_B2: + case MC13783_LED_R3: + case MC13783_LED_G3: + case MC13783_LED_B3: + bank = (led->id - MC13783_LED_R1)/3; + reg = MC13783_REG_LED_CONTROL_3 + bank; + shift = ((led->id - MC13783_LED_R1) - bank * 3) * 2; + mask = MC13783_LED_Cx_TC_C_MASK; + value = max_current & MC13783_LED_Cx_TC_C_MASK; + break; + } + + mc13783_lock(led->master); + + ret = mc13783_reg_rmw(led->master, reg, mask << shift, + value << shift); + + mc13783_unlock(led->master); + return ret; +} + +static int __devinit mc13783_leds_prepare(struct platform_device *pdev) +{ + struct mc13783_leds_platform_data *pdata = dev_get_platdata(&pdev->dev); + struct mc13783 *dev = dev_get_drvdata(pdev->dev.parent); + int ret = 0; + int reg = 0; + + mc13783_lock(dev); + + if (pdata->flags & MC13783_LED_TC1HALF) + reg |= MC13783_LED_C1_TC1HALF_BIT; + + if (pdata->flags & MC13783_LED_SLEWLIMTC) + reg |= MC13783_LED_Cx_SLEWLIM_BIT; + + ret = mc13783_reg_write(dev, MC13783_REG_LED_CONTROL_1, reg); + if (ret) + goto out; + + reg = (pdata->bl_period & MC13783_LED_Cx_PERIOD_MASK) << + MC13783_LED_Cx_PERIOD; + + if (pdata->flags & MC13783_LED_SLEWLIMBL) + reg |= MC13783_LED_Cx_SLEWLIM_BIT; + + ret = mc13783_reg_write(dev, MC13783_REG_LED_CONTROL_2, reg); + if (ret) + goto out; + + reg = (pdata->tc1_period & MC13783_LED_Cx_PERIOD_MASK) << + MC13783_LED_Cx_PERIOD; + + if (pdata->flags & MC13783_LED_TRIODE_TC1) + reg |= MC13783_LED_Cx_TRIODE_TC_BIT; + + ret = mc13783_reg_write(dev, MC13783_REG_LED_CONTROL_3, reg); + if (ret) + goto out; + + reg = (pdata->tc2_period & MC13783_LED_Cx_PERIOD_MASK) << + MC13783_LED_Cx_PERIOD; + + if (pdata->flags & MC13783_LED_TRIODE_TC2) + reg |= MC13783_LED_Cx_TRIODE_TC_BIT; + + ret = mc13783_reg_write(dev, MC13783_REG_LED_CONTROL_4, reg); + if (ret) + goto out; + + reg = (pdata->tc3_period & MC13783_LED_Cx_PERIOD_MASK) << + MC13783_LED_Cx_PERIOD; + + if (pdata->flags & MC13783_LED_TRIODE_TC3) + reg |= MC13783_LED_Cx_TRIODE_TC_BIT;; + + ret = mc13783_reg_write(dev, MC13783_REG_LED_CONTROL_5, reg); + if (ret) + goto out; + + reg = MC13783_LED_C0_ENABLE_BIT; + if (pdata->flags & MC13783_LED_TRIODE_MD) + reg |= MC13783_LED_C0_TRIODE_MD_BIT; + if (pdata->flags & MC13783_LED_TRIODE_AD) + reg |= MC13783_LED_C0_TRIODE_AD_BIT; + if (pdata->flags & MC13783_LED_TRIODE_KP) + reg |= MC13783_LED_C0_TRIODE_KP_BIT; + if (pdata->flags & MC13783_LED_BOOST_EN) + reg |= MC13783_LED_C0_BOOST_BIT; + + reg |= (pdata->abmode & MC13783_LED_C0_ABMODE_MASK) << + MC13783_LED_C0_ABMODE; + reg |= (pdata->abref & MC13783_LED_C0_ABREF_MASK) << + MC13783_LED_C0_ABREF; + + ret = mc13783_reg_write(dev, MC13783_REG_LED_CONTROL_0, reg); + +out: + mc13783_unlock(dev); + return ret; +} + +static int __devinit mc13783_led_probe(struct platform_device *pdev) +{ + struct mc13783_leds_platform_data *pdata = dev_get_platdata(&pdev->dev); + struct mc13783_led_platform_data *led_cur; + struct mc13783_led *led, *led_dat; + int ret, i; + int init_led = 0; + + if (pdata == NULL) { + dev_err(&pdev->dev, "missing platform data\n"); + return -ENODEV; + } + + if (pdata->num_leds < 1 || pdata->num_leds > MC13783_LED_MAX) { + dev_err(&pdev->dev, "Invalid led count %d\n", pdata->num_leds); + return -EINVAL; + } + + led = kzalloc(sizeof(*led) * pdata->num_leds, GFP_KERNEL); + if (led == NULL) { + dev_err(&pdev->dev, "failed to alloc memory\n"); + return -ENOMEM; + } + + ret = mc13783_leds_prepare(pdev); + if (ret) { + dev_err(&pdev->dev, "unable to init led driver\n"); + goto err_free; + } + + for (i = 0; i < pdata->num_leds; i++) { + led_dat = &led[i]; + led_cur = &pdata->led[i]; + + if (led_cur->id > MC13783_LED_MAX || led_cur->id < 0) { + dev_err(&pdev->dev, "invalid id %d\n", led_cur->id); + ret = -EINVAL; + goto err_register; + } + + if (init_led & (1 << led_cur->id)) { + dev_err(&pdev->dev, "led %d already initialized\n", + led_cur->id); + ret = -EINVAL; + goto err_register; + } + + init_led |= 1 << led_cur->id; + led_dat->cdev.name = led_cur->name; + led_dat->cdev.default_trigger = led_cur->default_trigger; + led_dat->cdev.brightness_set = mc13783_led_set; + led_dat->cdev.brightness = LED_OFF; + led_dat->id = led_cur->id; + led_dat->master = dev_get_drvdata(pdev->dev.parent); + + INIT_WORK(&led_dat->work, mc13783_led_work); + + ret = led_classdev_register(pdev->dev.parent, &led_dat->cdev); + if (ret) { + dev_err(&pdev->dev, "failed to register led %d\n", + led_dat->id); + goto err_register; + } + + ret = mc13783_led_setup(led_dat, led_cur->max_current); + if (ret) { + dev_err(&pdev->dev, "unable to init led %d\n", + led_dat->id); + i++; + goto err_register; + } + } + + platform_set_drvdata(pdev, led); + return 0; + +err_register: + for (i = i - 1; i >= 0; i--) { + led_classdev_unregister(&led[i].cdev); + cancel_work_sync(&led[i].work); + } + +err_free: + kfree(led); + return ret; +} + +static int __devexit mc13783_led_remove(struct platform_device *pdev) +{ + struct mc13783_leds_platform_data *pdata = dev_get_platdata(&pdev->dev); + struct mc13783_led *led = platform_get_drvdata(pdev); + struct mc13783 *dev = dev_get_drvdata(pdev->dev.parent); + int i; + + for (i = 0; i < pdata->num_leds; i++) { + led_classdev_unregister(&led[i].cdev); + cancel_work_sync(&led[i].work); + } + + mc13783_lock(dev); + + mc13783_reg_write(dev, MC13783_REG_LED_CONTROL_0, 0); + mc13783_reg_write(dev, MC13783_REG_LED_CONTROL_1, 0); + mc13783_reg_write(dev, MC13783_REG_LED_CONTROL_2, 0); + mc13783_reg_write(dev, MC13783_REG_LED_CONTROL_3, 0); + mc13783_reg_write(dev, MC13783_REG_LED_CONTROL_4, 0); + mc13783_reg_write(dev, MC13783_REG_LED_CONTROL_5, 0); + + mc13783_unlock(dev); + + kfree(led); + return 0; +} + +static struct platform_driver mc13783_led_driver = { + .driver = { + .name = "mc13783-led", + .owner = THIS_MODULE, + }, + .probe = mc13783_led_probe, + .remove = __devexit_p(mc13783_led_remove), +}; + +static int __init mc13783_led_init(void) +{ + return platform_driver_register(&mc13783_led_driver); +} +module_init(mc13783_led_init); + +static void __exit mc13783_led_exit(void) +{ + platform_driver_unregister(&mc13783_led_driver); +} +module_exit(mc13783_led_exit); + +MODULE_DESCRIPTION("LEDs driver for Freescale MC13783 PMIC"); +MODULE_AUTHOR("Philippe Retornaz <philippe.retornaz@epfl.ch>"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:mc13783-led"); |
