| /* Copyright (c) 2014, The Linux Foundation. All rights reserved. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 and |
| * only version 2 as published by the Free Software Foundation. |
| * |
| * 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/kernel.h> |
| #include <linux/init.h> |
| #include <linux/platform_device.h> |
| #include <linux/of_platform.h> |
| #include <mach/rpm-smd.h> |
| |
| #define RPM_REQUEST_TYPE_GPIO 0x6f697067 /* gpio */ |
| #define RPM_GPIO_NUMB_KEY 0x626d756e /* numb */ |
| #define RPM_GPIO_STAT_KEY 0x74617473 /* stat */ |
| #define RPM_GPIO_SETT_KEY 0x74746573 /* sett */ |
| #define RPM_GPIO_RESOURCE_ID 3 |
| #define GPIO_ON 1 |
| #define GPIO_OFF 0 |
| |
| static int msm_send_ext_buck_votes(int gpio_num, int settling_time) |
| { |
| int rc; |
| int gpio_status_sleep = GPIO_OFF; |
| int gpio_status_active = GPIO_ON; |
| |
| struct msm_rpm_kvp kvp_sleep[] = { |
| { |
| .key = RPM_GPIO_STAT_KEY, |
| .data = (void *)&gpio_status_sleep, |
| .length = sizeof(gpio_status_sleep), |
| } |
| }; |
| |
| struct msm_rpm_kvp kvp_active[] = { |
| { |
| .key = RPM_GPIO_NUMB_KEY, |
| .data = (void *)&gpio_num, |
| .length = sizeof(gpio_num), |
| }, |
| { |
| .key = RPM_GPIO_STAT_KEY, |
| .data = (void *)&gpio_status_active, |
| .length = sizeof(gpio_status_active), |
| }, |
| { |
| .key = RPM_GPIO_SETT_KEY, |
| .data = (void *)&settling_time, |
| .length = sizeof(settling_time), |
| }, |
| }; |
| |
| rc = msm_rpm_send_message(MSM_RPM_CTX_ACTIVE_SET, |
| RPM_REQUEST_TYPE_GPIO, RPM_GPIO_RESOURCE_ID, kvp_active, |
| ARRAY_SIZE(kvp_active)); |
| WARN(rc < 0, "RPM GPIO toggling (active set) did not enable!\n"); |
| |
| rc = msm_rpm_send_message(MSM_RPM_CTX_SLEEP_SET, |
| RPM_REQUEST_TYPE_GPIO, RPM_GPIO_RESOURCE_ID, kvp_sleep, |
| ARRAY_SIZE(kvp_sleep)); |
| WARN(rc < 0, "RPM GPIO toggling (sleep set) did not enable!\n"); |
| |
| return rc; |
| } |
| |
| static int msm_ext_buck_probe(struct platform_device *pdev) |
| { |
| char *key = NULL; |
| int gpio_num; |
| int settling_time_us; |
| int ret = 0; |
| |
| key = "qcom,gpio-num"; |
| ret = of_property_read_u32(pdev->dev.of_node, key, &gpio_num); |
| if (ret) { |
| pr_err("%s: Cannot read %s from dt (ret:%d)\n", |
| __func__, key, ret); |
| return ret; |
| } |
| |
| key = "qcom,settling-time-us"; |
| ret = of_property_read_u32(pdev->dev.of_node, key, |
| &settling_time_us); |
| if (ret) { |
| pr_err("%s: Cannot read %s from dt (ret:%d)\n", |
| __func__, key, ret); |
| return ret; |
| } |
| |
| ret = msm_send_ext_buck_votes(gpio_num, settling_time_us); |
| |
| return ret; |
| } |
| |
| static struct of_device_id msm_ext_buck_table[] __initdata = { |
| {.compatible = "qcom,ext-buck-control"}, |
| {}, |
| }; |
| |
| static struct platform_driver msm_ext_buck_driver = { |
| .probe = msm_ext_buck_probe, |
| .driver = { |
| .name = "ext-buck-control", |
| .owner = THIS_MODULE, |
| .of_match_table = msm_ext_buck_table, |
| }, |
| }; |
| |
| static int __init msm_ext_buck_init(void) |
| { |
| return platform_driver_register(&msm_ext_buck_driver); |
| } |
| late_initcall(msm_ext_buck_init); |