Yeleswarapu, Nagaradhesh | bbba6e3 | 2013-12-20 18:09:17 +0530 | [diff] [blame] | 1 | /* Copyright (c) 2013-2014, The Linux Foundation. All rights reserved. |
Bhalchandra Gajare | 9b4eb3b | 2013-04-30 12:00:41 -0700 | [diff] [blame] | 2 | * |
| 3 | * This program is free software; you can redistribute it and/or modify |
| 4 | * it under the terms of the GNU General Public License version 2 and |
| 5 | * only version 2 as published by the Free Software Foundation. |
| 6 | * |
| 7 | * This program is distributed in the hope that it will be useful, |
| 8 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 9 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 10 | * GNU General Public License for more details. |
| 11 | */ |
| 12 | |
| 13 | #include <linux/kernel.h> |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/types.h> |
| 16 | #include <linux/delay.h> |
| 17 | #include <linux/slab.h> |
| 18 | #include <linux/wait.h> |
| 19 | #include <linux/sched.h> |
| 20 | #include <linux/mfd/wcd9xxx/core-resource.h> |
| 21 | |
| 22 | |
| 23 | static enum wcd9xxx_intf_status wcd9xxx_intf = -1; |
| 24 | |
| 25 | int wcd9xxx_core_irq_init( |
| 26 | struct wcd9xxx_core_resource *wcd9xxx_core_res) |
| 27 | { |
| 28 | int ret = 0; |
| 29 | |
| 30 | if (wcd9xxx_core_res->irq != 1) { |
| 31 | ret = wcd9xxx_irq_init(wcd9xxx_core_res); |
| 32 | if (ret) |
| 33 | pr_err("IRQ initialization failed\n"); |
| 34 | } |
| 35 | |
| 36 | return ret; |
| 37 | } |
| 38 | EXPORT_SYMBOL(wcd9xxx_core_irq_init); |
| 39 | |
| 40 | int wcd9xxx_initialize_irq( |
| 41 | struct wcd9xxx_core_resource *wcd9xxx_core_res, |
| 42 | unsigned int irq, |
| 43 | unsigned int irq_base) |
| 44 | { |
| 45 | wcd9xxx_core_res->irq = irq; |
| 46 | wcd9xxx_core_res->irq_base = irq_base; |
| 47 | |
| 48 | return 0; |
| 49 | } |
| 50 | EXPORT_SYMBOL(wcd9xxx_initialize_irq); |
| 51 | |
| 52 | int wcd9xxx_core_res_init( |
| 53 | struct wcd9xxx_core_resource *wcd9xxx_core_res, |
| 54 | int num_irqs, int num_irq_regs, |
| 55 | int (*codec_read)(struct wcd9xxx_core_resource*, unsigned short), |
| 56 | int (*codec_write)(struct wcd9xxx_core_resource*, unsigned short, u8), |
| 57 | int (*codec_bulk_read) (struct wcd9xxx_core_resource*, unsigned short, |
Yeleswarapu, Nagaradhesh | bbba6e3 | 2013-12-20 18:09:17 +0530 | [diff] [blame] | 58 | int, u8*), |
| 59 | int (*codec_bulk_write) (struct wcd9xxx_core_resource*, unsigned short, |
Bhalchandra Gajare | 9b4eb3b | 2013-04-30 12:00:41 -0700 | [diff] [blame] | 60 | int, u8*)) |
| 61 | { |
| 62 | mutex_init(&wcd9xxx_core_res->pm_lock); |
| 63 | wcd9xxx_core_res->wlock_holders = 0; |
| 64 | wcd9xxx_core_res->pm_state = WCD9XXX_PM_SLEEPABLE; |
| 65 | init_waitqueue_head(&wcd9xxx_core_res->pm_wq); |
| 66 | pm_qos_add_request(&wcd9xxx_core_res->pm_qos_req, |
| 67 | PM_QOS_CPU_DMA_LATENCY, |
| 68 | PM_QOS_DEFAULT_VALUE); |
| 69 | |
| 70 | wcd9xxx_core_res->codec_reg_read = codec_read; |
| 71 | wcd9xxx_core_res->codec_reg_write = codec_write; |
| 72 | wcd9xxx_core_res->codec_bulk_read = codec_bulk_read; |
Yeleswarapu, Nagaradhesh | bbba6e3 | 2013-12-20 18:09:17 +0530 | [diff] [blame] | 73 | wcd9xxx_core_res->codec_bulk_write = codec_bulk_write; |
Bhalchandra Gajare | 9b4eb3b | 2013-04-30 12:00:41 -0700 | [diff] [blame] | 74 | wcd9xxx_core_res->num_irqs = num_irqs; |
| 75 | wcd9xxx_core_res->num_irq_regs = num_irq_regs; |
| 76 | |
| 77 | pr_info("%s: num_irqs = %d, num_irq_regs = %d\n", |
| 78 | __func__, wcd9xxx_core_res->num_irqs, |
| 79 | wcd9xxx_core_res->num_irq_regs); |
| 80 | |
| 81 | return 0; |
| 82 | } |
| 83 | EXPORT_SYMBOL(wcd9xxx_core_res_init); |
| 84 | |
| 85 | void wcd9xxx_core_res_deinit(struct wcd9xxx_core_resource *wcd9xxx_core_res) |
| 86 | { |
| 87 | pm_qos_remove_request(&wcd9xxx_core_res->pm_qos_req); |
| 88 | mutex_destroy(&wcd9xxx_core_res->pm_lock); |
| 89 | wcd9xxx_core_res->codec_reg_read = NULL; |
| 90 | wcd9xxx_core_res->codec_reg_write = NULL; |
| 91 | wcd9xxx_core_res->codec_bulk_read = NULL; |
| 92 | } |
| 93 | EXPORT_SYMBOL(wcd9xxx_core_res_deinit); |
| 94 | |
| 95 | enum wcd9xxx_pm_state wcd9xxx_pm_cmpxchg( |
| 96 | struct wcd9xxx_core_resource *wcd9xxx_core_res, |
| 97 | enum wcd9xxx_pm_state o, |
| 98 | enum wcd9xxx_pm_state n) |
| 99 | { |
| 100 | enum wcd9xxx_pm_state old; |
| 101 | mutex_lock(&wcd9xxx_core_res->pm_lock); |
| 102 | old = wcd9xxx_core_res->pm_state; |
| 103 | if (old == o) |
| 104 | wcd9xxx_core_res->pm_state = n; |
| 105 | mutex_unlock(&wcd9xxx_core_res->pm_lock); |
| 106 | return old; |
| 107 | } |
| 108 | EXPORT_SYMBOL(wcd9xxx_pm_cmpxchg); |
| 109 | |
| 110 | int wcd9xxx_core_res_suspend( |
| 111 | struct wcd9xxx_core_resource *wcd9xxx_core_res, |
| 112 | pm_message_t pmesg) |
| 113 | { |
| 114 | int ret = 0; |
| 115 | |
| 116 | pr_debug("%s: enter\n", __func__); |
| 117 | /* |
| 118 | * pm_qos_update_request() can be called after this suspend chain call |
| 119 | * started. thus suspend can be called while lock is being held |
| 120 | */ |
| 121 | mutex_lock(&wcd9xxx_core_res->pm_lock); |
| 122 | if (wcd9xxx_core_res->pm_state == WCD9XXX_PM_SLEEPABLE) { |
| 123 | pr_debug("%s: suspending system, state %d, wlock %d\n", |
| 124 | __func__, wcd9xxx_core_res->pm_state, |
| 125 | wcd9xxx_core_res->wlock_holders); |
| 126 | wcd9xxx_core_res->pm_state = WCD9XXX_PM_ASLEEP; |
| 127 | } else if (wcd9xxx_core_res->pm_state == WCD9XXX_PM_AWAKE) { |
| 128 | /* |
| 129 | * unlock to wait for pm_state == WCD9XXX_PM_SLEEPABLE |
| 130 | * then set to WCD9XXX_PM_ASLEEP |
| 131 | */ |
| 132 | pr_debug("%s: waiting to suspend system, state %d, wlock %d\n", |
| 133 | __func__, wcd9xxx_core_res->pm_state, |
| 134 | wcd9xxx_core_res->wlock_holders); |
| 135 | mutex_unlock(&wcd9xxx_core_res->pm_lock); |
| 136 | if (!(wait_event_timeout(wcd9xxx_core_res->pm_wq, |
| 137 | wcd9xxx_pm_cmpxchg(wcd9xxx_core_res, |
| 138 | WCD9XXX_PM_SLEEPABLE, |
| 139 | WCD9XXX_PM_ASLEEP) == |
| 140 | WCD9XXX_PM_SLEEPABLE, |
| 141 | HZ))) { |
| 142 | pr_debug("%s: suspend failed state %d, wlock %d\n", |
| 143 | __func__, wcd9xxx_core_res->pm_state, |
| 144 | wcd9xxx_core_res->wlock_holders); |
| 145 | ret = -EBUSY; |
| 146 | } else { |
| 147 | pr_debug("%s: done, state %d, wlock %d\n", __func__, |
| 148 | wcd9xxx_core_res->pm_state, |
| 149 | wcd9xxx_core_res->wlock_holders); |
| 150 | } |
| 151 | mutex_lock(&wcd9xxx_core_res->pm_lock); |
| 152 | } else if (wcd9xxx_core_res->pm_state == WCD9XXX_PM_ASLEEP) { |
| 153 | pr_warn("%s: system is already suspended, state %d, wlock %dn", |
| 154 | __func__, wcd9xxx_core_res->pm_state, |
| 155 | wcd9xxx_core_res->wlock_holders); |
| 156 | } |
| 157 | mutex_unlock(&wcd9xxx_core_res->pm_lock); |
| 158 | |
| 159 | return ret; |
| 160 | } |
| 161 | EXPORT_SYMBOL(wcd9xxx_core_res_suspend); |
| 162 | |
| 163 | int wcd9xxx_core_res_resume( |
| 164 | struct wcd9xxx_core_resource *wcd9xxx_core_res) |
| 165 | { |
| 166 | int ret = 0; |
| 167 | |
| 168 | pr_debug("%s: enter\n", __func__); |
| 169 | mutex_lock(&wcd9xxx_core_res->pm_lock); |
| 170 | if (wcd9xxx_core_res->pm_state == WCD9XXX_PM_ASLEEP) { |
| 171 | pr_debug("%s: resuming system, state %d, wlock %d\n", __func__, |
| 172 | wcd9xxx_core_res->pm_state, |
| 173 | wcd9xxx_core_res->wlock_holders); |
| 174 | wcd9xxx_core_res->pm_state = WCD9XXX_PM_SLEEPABLE; |
| 175 | } else { |
| 176 | pr_warn("%s: system is already awake, state %d wlock %d\n", |
| 177 | __func__, wcd9xxx_core_res->pm_state, |
| 178 | wcd9xxx_core_res->wlock_holders); |
| 179 | } |
| 180 | mutex_unlock(&wcd9xxx_core_res->pm_lock); |
| 181 | wake_up_all(&wcd9xxx_core_res->pm_wq); |
| 182 | |
| 183 | return ret; |
| 184 | } |
| 185 | EXPORT_SYMBOL(wcd9xxx_core_res_resume); |
| 186 | |
| 187 | enum wcd9xxx_intf_status wcd9xxx_get_intf_type(void) |
| 188 | { |
| 189 | return wcd9xxx_intf; |
| 190 | } |
| 191 | EXPORT_SYMBOL(wcd9xxx_get_intf_type); |
| 192 | |
| 193 | void wcd9xxx_set_intf_type(enum wcd9xxx_intf_status intf_status) |
| 194 | { |
| 195 | wcd9xxx_intf = intf_status; |
| 196 | } |
| 197 | EXPORT_SYMBOL(wcd9xxx_set_intf_type); |