projects / mirror_ubuntu-jammy-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 90550d19 MN |
1 | /* |
| 2 | * Copyright (C) ST-Ericsson SA 2010 | |
| 3 | * Author: Mattias Nilsson <mattias.i.nilsson@stericsson.com> for ST Ericsson. | |
| 4 | * License terms: GNU General Public License (GPL) version 2 | |
| 5 | */ | |
| 6 | ||
| 7 | #include <linux/err.h> | |
| 4e36dd33 | 8 | #include <linux/module.h> |
| 90550d19 | 9 | #include <linux/platform_device.h> |
| 379749c4 LJ |
10 | #include <linux/pm.h> |
| 11 | #include <linux/signal.h> | |
| 90550d19 | 12 | #include <linux/mfd/abx500.h> |
| ee66e653 LW |
13 | #include <linux/mfd/abx500/ab8500.h> |
| 14 | #include <linux/mfd/abx500/ab8500-sysctrl.h> | |
| 90550d19 MN |
15 | |
| 16 | static struct device *sysctrl_dev; | |
| 17 | ||
| 379749c4 LJ |
18 | void ab8500_power_off(void) |
| 19 | { | |
| 20 | sigset_t old; | |
| 21 | sigset_t all; | |
| 22 | ||
| 23 | sigfillset(&all); | |
| 24 | ||
| 25 | if (!sigprocmask(SIG_BLOCK, &all, &old)) { | |
| 26 | (void)ab8500_sysctrl_set(AB8500_STW4500CTRL1, | |
| 27 | AB8500_STW4500CTRL1_SWOFF | | |
| 28 | AB8500_STW4500CTRL1_SWRESET4500N); | |
| 29 | (void)sigprocmask(SIG_SETMASK, &old, NULL); | |
| 30 | } | |
| 31 | } | |
| 32 | ||
| 90550d19 MN |
33 | static inline bool valid_bank(u8 bank) |
| 34 | { | |
| 35 | return ((bank == AB8500_SYS_CTRL1_BLOCK) || | |
| 36 | (bank == AB8500_SYS_CTRL2_BLOCK)); | |
| 37 | } | |
| 38 | ||
| 39 | int ab8500_sysctrl_read(u16 reg, u8 *value) | |
| 40 | { | |
| 41 | u8 bank; | |
| 42 | ||
| 43 | if (sysctrl_dev == NULL) | |
| 44 | return -EAGAIN; | |
| 45 | ||
| 46 | bank = (reg >> 8); | |
| 47 | if (!valid_bank(bank)) | |
| 48 | return -EINVAL; | |
| 49 | ||
| 50 | return abx500_get_register_interruptible(sysctrl_dev, bank, | |
| 51 | (u8)(reg & 0xFF), value); | |
| 52 | } | |
| 53 | ||
| 54 | int ab8500_sysctrl_write(u16 reg, u8 mask, u8 value) | |
| 55 | { | |
| 56 | u8 bank; | |
| 57 | ||
| 58 | if (sysctrl_dev == NULL) | |
| 59 | return -EAGAIN; | |
| 60 | ||
| 61 | bank = (reg >> 8); | |
| 62 | if (!valid_bank(bank)) | |
| 63 | return -EINVAL; | |
| 64 | ||
| 65 | return abx500_mask_and_set_register_interruptible(sysctrl_dev, bank, | |
| 66 | (u8)(reg & 0xFF), mask, value); | |
| 67 | } | |
| 68 | ||
| f791be49 | 69 | static int ab8500_sysctrl_probe(struct platform_device *pdev) |
| 90550d19 | 70 | { |
| 379749c4 LJ |
71 | struct ab8500_platform_data *plat; |
| 72 | ||
| 90550d19 | 73 | sysctrl_dev = &pdev->dev; |
| 379749c4 LJ |
74 | plat = dev_get_platdata(pdev->dev.parent); |
| 75 | if (plat->pm_power_off) | |
| 76 | pm_power_off = ab8500_power_off; | |
| 90550d19 MN |
77 | return 0; |
| 78 | } | |
| 79 | ||
| 4740f73f | 80 | static int ab8500_sysctrl_remove(struct platform_device *pdev) |
| 90550d19 MN |
81 | { |
| 82 | sysctrl_dev = NULL; | |
| 83 | return 0; | |
| 84 | } | |
| 85 | ||
| 86 | static struct platform_driver ab8500_sysctrl_driver = { | |
| 87 | .driver = { | |
| 88 | .name = "ab8500-sysctrl", | |
| 89 | .owner = THIS_MODULE, | |
| 90 | }, | |
| 91 | .probe = ab8500_sysctrl_probe, | |
| 84449216 | 92 | .remove = ab8500_sysctrl_remove, |
| 90550d19 MN |
93 | }; |
| 94 | ||
| 95 | static int __init ab8500_sysctrl_init(void) | |
| 96 | { | |
| 97 | return platform_driver_register(&ab8500_sysctrl_driver); | |
| 98 | } | |
| 99 | subsys_initcall(ab8500_sysctrl_init); | |
| 100 | ||
| 101 | MODULE_AUTHOR("Mattias Nilsson <mattias.i.nilsson@stericsson.com"); | |
| 102 | MODULE_DESCRIPTION("AB8500 system control driver"); | |
| 103 | MODULE_LICENSE("GPL v2"); |