diff options
Diffstat (limited to 'arch/arm/mach-exynos/u1_regulator_consumer.c')
| -rw-r--r-- | arch/arm/mach-exynos/u1_regulator_consumer.c | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/arch/arm/mach-exynos/u1_regulator_consumer.c b/arch/arm/mach-exynos/u1_regulator_consumer.c new file mode 100644 index 0000000..e142235 --- /dev/null +++ b/arch/arm/mach-exynos/u1_regulator_consumer.c @@ -0,0 +1,147 @@ +/* u1-regulator-consumer.c + * + * Copyright (C) 2011 Samsung Electronics + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ +#include <linux/module.h> +#include <linux/err.h> +#include <linux/platform_device.h> +#include <linux/regulator/machine.h> + +static int u1_enable_regulator_for_usb_mipi(bool enable) +{ + struct regulator *mipi11_regulator; + struct regulator *mipi18_regulator; +#ifndef CONFIG_MACH_U1_KOR_LGT + struct regulator *hsic12_regulator; +#endif + struct regulator *usb33_regulator; + int ret = 0; + + mipi11_regulator = regulator_get(NULL, "vmipi_1.1v"); + if (IS_ERR(mipi11_regulator)) { + pr_err("%s: failed to get %s\n", __func__, "vmipi_1.1v"); + ret = -ENODEV; + goto out4; + } + + mipi18_regulator = regulator_get(NULL, "vmipi_1.8v"); + if (IS_ERR(mipi18_regulator)) { + pr_err("%s: failed to get %s\n", __func__, "vmipi_1.8v"); + ret = -ENODEV; + goto out3; + } + +#ifndef CONFIG_MACH_U1_KOR_LGT + hsic12_regulator = regulator_get(NULL, "vhsic"); + if (IS_ERR(hsic12_regulator)) { + pr_err("%s: failed to get %s\n", __func__, "vhsic 1.2v"); + ret = -ENODEV; + goto out2; + } +#endif + + usb33_regulator = regulator_get(NULL, "vusb_3.3v"); + if (IS_ERR(usb33_regulator)) { + pr_err("%s: failed to get %s\n", __func__, "vusb_3.3v"); + ret = -ENODEV; + goto out1; + } + + if (enable) { + /* Power On Sequence + * MIPI 1.1V -> HSIC 1.2V -> MIPI 1.8V -> USB 3.3V + */ + pr_info("%s: enable LDOs\n", __func__); + if (!regulator_is_enabled(mipi11_regulator)) + regulator_enable(mipi11_regulator); +#ifndef CONFIG_MACH_U1_KOR_LGT + if (!regulator_is_enabled(hsic12_regulator)) + regulator_enable(hsic12_regulator); +#endif + if (!regulator_is_enabled(mipi18_regulator)) + regulator_enable(mipi18_regulator); + if (!regulator_is_enabled(usb33_regulator)) + regulator_enable(usb33_regulator); + } else { + /* Power Off Sequence + * USB 3.3V -> MIPI 18V -> HSIC 1.2V -> MIPI 1.1V + */ + pr_info("%s: disable LDOs\n", __func__); + regulator_force_disable(usb33_regulator); + regulator_force_disable(mipi18_regulator); +#ifndef CONFIG_MACH_U1_KOR_LGT + regulator_force_disable(hsic12_regulator); +#endif + regulator_force_disable(mipi11_regulator); + } + + regulator_put(usb33_regulator); +out1: +#ifndef CONFIG_MACH_U1_KOR_LGT + regulator_put(hsic12_regulator); +#endif +out2: + regulator_put(mipi18_regulator); +out3: + regulator_put(mipi11_regulator); +out4: + return ret; +} + + +static int regulator_consumer_probe(struct platform_device *pdev) +{ + pr_info("%s: loading u1-regulator-consumer\n", __func__); + return 0; +} + +#ifdef CONFIG_PM +static int regulator_consumer_suspend(struct device *dev) +{ + u1_enable_regulator_for_usb_mipi(false); + return 0; +} + +static int regulator_consumer_resume(struct device *dev) +{ + u1_enable_regulator_for_usb_mipi(true); + return 0; +} +#else +#define regulator_consumer_suspend NULL +#define regulator_consumer_resume NULL +#endif /* CONFIG_PM */ + +static const struct dev_pm_ops regulator_consumer_pm_ops = { + .suspend = regulator_consumer_suspend, + .resume = regulator_consumer_resume, +}; + +static struct platform_driver regulator_consumer_driver = { + .probe = regulator_consumer_probe, + .driver = { + .owner = THIS_MODULE, + .name = "u1-regulator-consumer", + .pm = ®ulator_consumer_pm_ops, + }, +}; + +static int __init regulator_consumer_init(void) +{ + return platform_driver_register(®ulator_consumer_driver); +} +module_init(regulator_consumer_init); + +MODULE_DESCRIPTION("U1 regulator consumer driver"); +MODULE_AUTHOR("ms925.kim@samsung.com"); +MODULE_LICENSE("GPL"); |