1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * twl4030-vibra.c - TWL4030 Vibrator driver 4 * 5 * Copyright (C) 2008-2010 Nokia Corporation 6 * 7 * Written by Henrik Saari <henrik.saari@nokia.com> 8 * Updates by Felipe Balbi <felipe.balbi@nokia.com> 9 * Input by Jari Vanhala <ext-jari.vanhala@nokia.com> 10 */ 11 12 #include <linux/module.h> 13 #include <linux/jiffies.h> 14 #include <linux/platform_device.h> 15 #include <linux/of.h> 16 #include <linux/workqueue.h> 17 #include <linux/mfd/twl.h> 18 #include <linux/mfd/twl4030-audio.h> 19 #include <linux/input.h> 20 #include <linux/slab.h> 21 22 /* MODULE ID2 */ 23 #define LEDEN 0x00 24 25 /* ForceFeedback */ 26 #define EFFECT_DIR_180_DEG 0x8000 /* range is 0 - 0xFFFF */ 27 28 struct vibra_info { 29 struct device *dev; 30 struct input_dev *input_dev; 31 32 struct work_struct play_work; 33 34 bool enabled; 35 int speed; 36 int direction; 37 38 bool coexist; 39 }; 40 41 static void vibra_disable_leds(void) 42 { 43 u8 reg; 44 45 /* Disable LEDA & LEDB, cannot be used with vibra (PWM) */ 46 twl_i2c_read_u8(TWL4030_MODULE_LED, ®, LEDEN); 47 reg &= ~0x03; 48 twl_i2c_write_u8(TWL4030_MODULE_LED, LEDEN, reg); 49 } 50 51 /* Powers H-Bridge and enables audio clk */ 52 static void vibra_enable(struct vibra_info *info) 53 { 54 u8 reg; 55 56 twl4030_audio_enable_resource(TWL4030_AUDIO_RES_POWER); 57 58 /* turn H-Bridge on */ 59 twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, 60 ®, TWL4030_REG_VIBRA_CTL); 61 twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE, 62 (reg | TWL4030_VIBRA_EN), TWL4030_REG_VIBRA_CTL); 63 64 twl4030_audio_enable_resource(TWL4030_AUDIO_RES_APLL); 65 66 info->enabled = true; 67 } 68 69 static void vibra_disable(struct vibra_info *info) 70 { 71 u8 reg; 72 73 /* Power down H-Bridge */ 74 twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, 75 ®, TWL4030_REG_VIBRA_CTL); 76 twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE, 77 (reg & ~TWL4030_VIBRA_EN), TWL4030_REG_VIBRA_CTL); 78 79 twl4030_audio_disable_resource(TWL4030_AUDIO_RES_APLL); 80 twl4030_audio_disable_resource(TWL4030_AUDIO_RES_POWER); 81 82 info->enabled = false; 83 } 84 85 static void vibra_play_work(struct work_struct *work) 86 { 87 struct vibra_info *info = container_of(work, 88 struct vibra_info, play_work); 89 int dir; 90 int pwm; 91 u8 reg; 92 93 dir = info->direction; 94 pwm = info->speed; 95 96 twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, 97 ®, TWL4030_REG_VIBRA_CTL); 98 if (pwm && (!info->coexist || !(reg & TWL4030_VIBRA_SEL))) { 99 100 if (!info->enabled) 101 vibra_enable(info); 102 103 /* set vibra rotation direction */ 104 twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, 105 ®, TWL4030_REG_VIBRA_CTL); 106 reg = (dir) ? (reg | TWL4030_VIBRA_DIR) : 107 (reg & ~TWL4030_VIBRA_DIR); 108 twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE, 109 reg, TWL4030_REG_VIBRA_CTL); 110 111 /* set PWM, 1 = max, 255 = min */ 112 twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE, 113 256 - pwm, TWL4030_REG_VIBRA_SET); 114 } else { 115 if (info->enabled) 116 vibra_disable(info); 117 } 118 } 119 120 /*** Input/ForceFeedback ***/ 121 122 static int vibra_play(struct input_dev *input, void *data, 123 struct ff_effect *effect) 124 { 125 struct vibra_info *info = input_get_drvdata(input); 126 127 info->speed = effect->u.rumble.strong_magnitude >> 8; 128 if (!info->speed) 129 info->speed = effect->u.rumble.weak_magnitude >> 9; 130 info->direction = effect->direction < EFFECT_DIR_180_DEG ? 0 : 1; 131 schedule_work(&info->play_work); 132 return 0; 133 } 134 135 static void twl4030_vibra_close(struct input_dev *input) 136 { 137 struct vibra_info *info = input_get_drvdata(input); 138 139 cancel_work_sync(&info->play_work); 140 141 if (info->enabled) 142 vibra_disable(info); 143 } 144 145 /*** Module ***/ 146 static int twl4030_vibra_suspend(struct device *dev) 147 { 148 struct platform_device *pdev = to_platform_device(dev); 149 struct vibra_info *info = platform_get_drvdata(pdev); 150 151 if (info->enabled) 152 vibra_disable(info); 153 154 return 0; 155 } 156 157 static int twl4030_vibra_resume(struct device *dev) 158 { 159 vibra_disable_leds(); 160 return 0; 161 } 162 163 static DEFINE_SIMPLE_DEV_PM_OPS(twl4030_vibra_pm_ops, 164 twl4030_vibra_suspend, twl4030_vibra_resume); 165 166 static bool twl4030_vibra_check_coexist(struct device_node *parent) 167 { 168 struct device_node *node; 169 170 node = of_get_child_by_name(parent, "codec"); 171 if (node) { 172 of_node_put(node); 173 return true; 174 } 175 176 return false; 177 } 178 179 static int twl4030_vibra_probe(struct platform_device *pdev) 180 { 181 struct device_node *twl4030_core_node = pdev->dev.parent->of_node; 182 struct vibra_info *info; 183 int ret; 184 185 if (!twl4030_core_node) { 186 dev_dbg(&pdev->dev, "twl4030 OF node is missing\n"); 187 return -EINVAL; 188 } 189 190 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); 191 if (!info) 192 return -ENOMEM; 193 194 info->dev = &pdev->dev; 195 info->coexist = twl4030_vibra_check_coexist(twl4030_core_node); 196 INIT_WORK(&info->play_work, vibra_play_work); 197 198 info->input_dev = devm_input_allocate_device(&pdev->dev); 199 if (info->input_dev == NULL) { 200 dev_err(&pdev->dev, "couldn't allocate input device\n"); 201 return -ENOMEM; 202 } 203 204 input_set_drvdata(info->input_dev, info); 205 206 info->input_dev->name = "twl4030:vibrator"; 207 info->input_dev->id.version = 1; 208 info->input_dev->close = twl4030_vibra_close; 209 __set_bit(FF_RUMBLE, info->input_dev->ffbit); 210 211 ret = input_ff_create_memless(info->input_dev, NULL, vibra_play); 212 if (ret < 0) { 213 dev_dbg(&pdev->dev, "couldn't register vibrator to FF\n"); 214 return ret; 215 } 216 217 ret = input_register_device(info->input_dev); 218 if (ret < 0) { 219 dev_dbg(&pdev->dev, "couldn't register input device\n"); 220 goto err_iff; 221 } 222 223 vibra_disable_leds(); 224 225 platform_set_drvdata(pdev, info); 226 return 0; 227 228 err_iff: 229 input_ff_destroy(info->input_dev); 230 return ret; 231 } 232 233 static struct platform_driver twl4030_vibra_driver = { 234 .probe = twl4030_vibra_probe, 235 .driver = { 236 .name = "twl4030-vibra", 237 .pm = pm_sleep_ptr(&twl4030_vibra_pm_ops), 238 }, 239 }; 240 module_platform_driver(twl4030_vibra_driver); 241 242 MODULE_ALIAS("platform:twl4030-vibra"); 243 MODULE_DESCRIPTION("TWL4030 Vibra driver"); 244 MODULE_LICENSE("GPL"); 245 MODULE_AUTHOR("Nokia Corporation"); 246