1 // SPDX-License-Identifier: GPL-2.0-only 2 /* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved. 3 */ 4 5 #include <linux/errno.h> 6 #include <linux/input.h> 7 #include <linux/kernel.h> 8 #include <linux/module.h> 9 #include <linux/of.h> 10 #include <linux/of_device.h> 11 #include <linux/platform_device.h> 12 #include <linux/regmap.h> 13 #include <linux/slab.h> 14 15 #define VIB_MAX_LEVEL_mV (3100) 16 #define VIB_MIN_LEVEL_mV (1200) 17 #define VIB_MAX_LEVELS (VIB_MAX_LEVEL_mV - VIB_MIN_LEVEL_mV) 18 19 #define MAX_FF_SPEED 0xff 20 21 struct pm8xxx_regs { 22 unsigned int enable_addr; 23 unsigned int enable_mask; 24 25 unsigned int drv_addr; 26 unsigned int drv_mask; 27 unsigned int drv_shift; 28 unsigned int drv_en_manual_mask; 29 }; 30 31 static const struct pm8xxx_regs pm8058_regs = { 32 .drv_addr = 0x4A, 33 .drv_mask = 0xf8, 34 .drv_shift = 3, 35 .drv_en_manual_mask = 0xfc, 36 }; 37 38 static struct pm8xxx_regs pm8916_regs = { 39 .enable_addr = 0xc046, 40 .enable_mask = BIT(7), 41 .drv_addr = 0xc041, 42 .drv_mask = 0x1F, 43 .drv_shift = 0, 44 .drv_en_manual_mask = 0, 45 }; 46 47 /** 48 * struct pm8xxx_vib - structure to hold vibrator data 49 * @vib_input_dev: input device supporting force feedback 50 * @work: work structure to set the vibration parameters 51 * @regmap: regmap for register read/write 52 * @regs: registers' info 53 * @speed: speed of vibration set from userland 54 * @active: state of vibrator 55 * @level: level of vibration to set in the chip 56 * @reg_vib_drv: regs->drv_addr register value 57 */ 58 struct pm8xxx_vib { 59 struct input_dev *vib_input_dev; 60 struct work_struct work; 61 struct regmap *regmap; 62 const struct pm8xxx_regs *regs; 63 int speed; 64 int level; 65 bool active; 66 u8 reg_vib_drv; 67 }; 68 69 /** 70 * pm8xxx_vib_set - handler to start/stop vibration 71 * @vib: pointer to vibrator structure 72 * @on: state to set 73 */ 74 static int pm8xxx_vib_set(struct pm8xxx_vib *vib, bool on) 75 { 76 int rc; 77 unsigned int val = vib->reg_vib_drv; 78 const struct pm8xxx_regs *regs = vib->regs; 79 80 if (on) 81 val |= (vib->level << regs->drv_shift) & regs->drv_mask; 82 else 83 val &= ~regs->drv_mask; 84 85 rc = regmap_write(vib->regmap, regs->drv_addr, val); 86 if (rc < 0) 87 return rc; 88 89 vib->reg_vib_drv = val; 90 91 if (regs->enable_mask) 92 rc = regmap_update_bits(vib->regmap, regs->enable_addr, 93 regs->enable_mask, on ? ~0 : 0); 94 95 return rc; 96 } 97 98 /** 99 * pm8xxx_work_handler - worker to set vibration level 100 * @work: pointer to work_struct 101 */ 102 static void pm8xxx_work_handler(struct work_struct *work) 103 { 104 struct pm8xxx_vib *vib = container_of(work, struct pm8xxx_vib, work); 105 const struct pm8xxx_regs *regs = vib->regs; 106 int rc; 107 unsigned int val; 108 109 rc = regmap_read(vib->regmap, regs->drv_addr, &val); 110 if (rc < 0) 111 return; 112 113 /* 114 * pmic vibrator supports voltage ranges from 1.2 to 3.1V, so 115 * scale the level to fit into these ranges. 116 */ 117 if (vib->speed) { 118 vib->active = true; 119 vib->level = ((VIB_MAX_LEVELS * vib->speed) / MAX_FF_SPEED) + 120 VIB_MIN_LEVEL_mV; 121 vib->level /= 100; 122 } else { 123 vib->active = false; 124 vib->level = VIB_MIN_LEVEL_mV / 100; 125 } 126 127 pm8xxx_vib_set(vib, vib->active); 128 } 129 130 /** 131 * pm8xxx_vib_close - callback of input close callback 132 * @dev: input device pointer 133 * 134 * Turns off the vibrator. 135 */ 136 static void pm8xxx_vib_close(struct input_dev *dev) 137 { 138 struct pm8xxx_vib *vib = input_get_drvdata(dev); 139 140 cancel_work_sync(&vib->work); 141 if (vib->active) 142 pm8xxx_vib_set(vib, false); 143 } 144 145 /** 146 * pm8xxx_vib_play_effect - function to handle vib effects. 147 * @dev: input device pointer 148 * @data: data of effect 149 * @effect: effect to play 150 * 151 * Currently this driver supports only rumble effects. 152 */ 153 static int pm8xxx_vib_play_effect(struct input_dev *dev, void *data, 154 struct ff_effect *effect) 155 { 156 struct pm8xxx_vib *vib = input_get_drvdata(dev); 157 158 vib->speed = effect->u.rumble.strong_magnitude >> 8; 159 if (!vib->speed) 160 vib->speed = effect->u.rumble.weak_magnitude >> 9; 161 162 schedule_work(&vib->work); 163 164 return 0; 165 } 166 167 static int pm8xxx_vib_probe(struct platform_device *pdev) 168 { 169 struct pm8xxx_vib *vib; 170 struct input_dev *input_dev; 171 int error; 172 unsigned int val; 173 const struct pm8xxx_regs *regs; 174 175 vib = devm_kzalloc(&pdev->dev, sizeof(*vib), GFP_KERNEL); 176 if (!vib) 177 return -ENOMEM; 178 179 vib->regmap = dev_get_regmap(pdev->dev.parent, NULL); 180 if (!vib->regmap) 181 return -ENODEV; 182 183 input_dev = devm_input_allocate_device(&pdev->dev); 184 if (!input_dev) 185 return -ENOMEM; 186 187 INIT_WORK(&vib->work, pm8xxx_work_handler); 188 vib->vib_input_dev = input_dev; 189 190 regs = of_device_get_match_data(&pdev->dev); 191 192 /* operate in manual mode */ 193 error = regmap_read(vib->regmap, regs->drv_addr, &val); 194 if (error < 0) 195 return error; 196 197 val &= regs->drv_en_manual_mask; 198 error = regmap_write(vib->regmap, regs->drv_addr, val); 199 if (error < 0) 200 return error; 201 202 vib->regs = regs; 203 vib->reg_vib_drv = val; 204 205 input_dev->name = "pm8xxx_vib_ffmemless"; 206 input_dev->id.version = 1; 207 input_dev->close = pm8xxx_vib_close; 208 input_set_drvdata(input_dev, vib); 209 input_set_capability(vib->vib_input_dev, EV_FF, FF_RUMBLE); 210 211 error = input_ff_create_memless(input_dev, NULL, 212 pm8xxx_vib_play_effect); 213 if (error) { 214 dev_err(&pdev->dev, 215 "couldn't register vibrator as FF device\n"); 216 return error; 217 } 218 219 error = input_register_device(input_dev); 220 if (error) { 221 dev_err(&pdev->dev, "couldn't register input device\n"); 222 return error; 223 } 224 225 platform_set_drvdata(pdev, vib); 226 return 0; 227 } 228 229 static int __maybe_unused pm8xxx_vib_suspend(struct device *dev) 230 { 231 struct pm8xxx_vib *vib = dev_get_drvdata(dev); 232 233 /* Turn off the vibrator */ 234 pm8xxx_vib_set(vib, false); 235 236 return 0; 237 } 238 239 static SIMPLE_DEV_PM_OPS(pm8xxx_vib_pm_ops, pm8xxx_vib_suspend, NULL); 240 241 static const struct of_device_id pm8xxx_vib_id_table[] = { 242 { .compatible = "qcom,pm8058-vib", .data = &pm8058_regs }, 243 { .compatible = "qcom,pm8921-vib", .data = &pm8058_regs }, 244 { .compatible = "qcom,pm8916-vib", .data = &pm8916_regs }, 245 { } 246 }; 247 MODULE_DEVICE_TABLE(of, pm8xxx_vib_id_table); 248 249 static struct platform_driver pm8xxx_vib_driver = { 250 .probe = pm8xxx_vib_probe, 251 .driver = { 252 .name = "pm8xxx-vib", 253 .pm = &pm8xxx_vib_pm_ops, 254 .of_match_table = pm8xxx_vib_id_table, 255 }, 256 }; 257 module_platform_driver(pm8xxx_vib_driver); 258 259 MODULE_ALIAS("platform:pm8xxx_vib"); 260 MODULE_DESCRIPTION("PMIC8xxx vibrator driver based on ff-memless framework"); 261 MODULE_LICENSE("GPL v2"); 262 MODULE_AUTHOR("Amy Maloche <amaloche@codeaurora.org>"); 263