leds: Add mc13783 LED support

This add basic led support for Freescale MC13783 PMIC.

Signed-off-by: Philippe Rétornaz <philippe.retornaz@epfl.ch>
Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>

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 000000000000..f05bb08d0f09
--- /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");