1d2912cb1SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 2c746b551SMark Brown /* 3c746b551SMark Brown * LED driver for WM831x status LEDs 4c746b551SMark Brown * 5c746b551SMark Brown * Copyright(C) 2009 Wolfson Microelectronics PLC. 6c746b551SMark Brown */ 7c746b551SMark Brown 8c746b551SMark Brown #include <linux/kernel.h> 9c746b551SMark Brown #include <linux/platform_device.h> 105a0e3ad6STejun Heo #include <linux/slab.h> 11c746b551SMark Brown #include <linux/leds.h> 12c746b551SMark Brown #include <linux/err.h> 13c746b551SMark Brown #include <linux/mfd/wm831x/core.h> 14c746b551SMark Brown #include <linux/mfd/wm831x/pdata.h> 15c746b551SMark Brown #include <linux/mfd/wm831x/status.h> 1654f4dedbSPaul Gortmaker #include <linux/module.h> 17c746b551SMark Brown 18c746b551SMark Brown 19c746b551SMark Brown struct wm831x_status { 20c746b551SMark Brown struct led_classdev cdev; 21c746b551SMark Brown struct wm831x *wm831x; 22c746b551SMark Brown struct mutex mutex; 23c746b551SMark Brown 24c746b551SMark Brown spinlock_t value_lock; 25c746b551SMark Brown int reg; /* Control register */ 26c746b551SMark Brown int reg_val; /* Control register value */ 27c746b551SMark Brown 28c746b551SMark Brown int blink; 29c746b551SMark Brown int blink_time; 30c746b551SMark Brown int blink_cyc; 31c746b551SMark Brown int src; 32c746b551SMark Brown enum led_brightness brightness; 33c746b551SMark Brown }; 34c746b551SMark Brown 35c746b551SMark Brown #define to_wm831x_status(led_cdev) \ 36c746b551SMark Brown container_of(led_cdev, struct wm831x_status, cdev) 37c746b551SMark Brown 38f633a512SAndrew Lunn static void wm831x_status_set(struct wm831x_status *led) 39c746b551SMark Brown { 40c746b551SMark Brown unsigned long flags; 41c746b551SMark Brown 42c746b551SMark Brown mutex_lock(&led->mutex); 43c746b551SMark Brown 44c746b551SMark Brown led->reg_val &= ~(WM831X_LED_SRC_MASK | WM831X_LED_MODE_MASK | 45c746b551SMark Brown WM831X_LED_DUTY_CYC_MASK | WM831X_LED_DUR_MASK); 46c746b551SMark Brown 47c746b551SMark Brown spin_lock_irqsave(&led->value_lock, flags); 48c746b551SMark Brown 49c746b551SMark Brown led->reg_val |= led->src << WM831X_LED_SRC_SHIFT; 50c746b551SMark Brown if (led->blink) { 51c746b551SMark Brown led->reg_val |= 2 << WM831X_LED_MODE_SHIFT; 52c746b551SMark Brown led->reg_val |= led->blink_time << WM831X_LED_DUR_SHIFT; 53c746b551SMark Brown led->reg_val |= led->blink_cyc; 54c746b551SMark Brown } else { 55c746b551SMark Brown if (led->brightness != LED_OFF) 56c746b551SMark Brown led->reg_val |= 1 << WM831X_LED_MODE_SHIFT; 57c746b551SMark Brown } 58c746b551SMark Brown 59c746b551SMark Brown spin_unlock_irqrestore(&led->value_lock, flags); 60c746b551SMark Brown 61c746b551SMark Brown wm831x_reg_write(led->wm831x, led->reg, led->reg_val); 62c746b551SMark Brown 63c746b551SMark Brown mutex_unlock(&led->mutex); 64c746b551SMark Brown } 65c746b551SMark Brown 66f633a512SAndrew Lunn static int wm831x_status_brightness_set(struct led_classdev *led_cdev, 67c746b551SMark Brown enum led_brightness value) 68c746b551SMark Brown { 69c746b551SMark Brown struct wm831x_status *led = to_wm831x_status(led_cdev); 70c746b551SMark Brown unsigned long flags; 71c746b551SMark Brown 72c746b551SMark Brown spin_lock_irqsave(&led->value_lock, flags); 73c746b551SMark Brown led->brightness = value; 74c746b551SMark Brown if (value == LED_OFF) 75c746b551SMark Brown led->blink = 0; 76c746b551SMark Brown spin_unlock_irqrestore(&led->value_lock, flags); 77f633a512SAndrew Lunn wm831x_status_set(led); 78f633a512SAndrew Lunn 79f633a512SAndrew Lunn return 0; 80c746b551SMark Brown } 81c746b551SMark Brown 82c746b551SMark Brown static int wm831x_status_blink_set(struct led_classdev *led_cdev, 83c746b551SMark Brown unsigned long *delay_on, 84c746b551SMark Brown unsigned long *delay_off) 85c746b551SMark Brown { 86c746b551SMark Brown struct wm831x_status *led = to_wm831x_status(led_cdev); 87c746b551SMark Brown unsigned long flags; 88c746b551SMark Brown int ret = 0; 89c746b551SMark Brown 90c746b551SMark Brown /* Pick some defaults if we've not been given times */ 91c746b551SMark Brown if (*delay_on == 0 && *delay_off == 0) { 92c746b551SMark Brown *delay_on = 250; 93c746b551SMark Brown *delay_off = 250; 94c746b551SMark Brown } 95c746b551SMark Brown 96c746b551SMark Brown spin_lock_irqsave(&led->value_lock, flags); 97c746b551SMark Brown 98c746b551SMark Brown /* We only have a limited selection of settings, see if we can 99c746b551SMark Brown * support the configuration we're being given */ 100c746b551SMark Brown switch (*delay_on) { 101c746b551SMark Brown case 1000: 102c746b551SMark Brown led->blink_time = 0; 103c746b551SMark Brown break; 104c746b551SMark Brown case 250: 105c746b551SMark Brown led->blink_time = 1; 106c746b551SMark Brown break; 107c746b551SMark Brown case 125: 108c746b551SMark Brown led->blink_time = 2; 109c746b551SMark Brown break; 110c746b551SMark Brown case 62: 111c746b551SMark Brown case 63: 112c746b551SMark Brown /* Actually 62.5ms */ 113c746b551SMark Brown led->blink_time = 3; 114c746b551SMark Brown break; 115c746b551SMark Brown default: 116c746b551SMark Brown ret = -EINVAL; 117c746b551SMark Brown break; 118c746b551SMark Brown } 119c746b551SMark Brown 120c746b551SMark Brown if (ret == 0) { 121c746b551SMark Brown switch (*delay_off / *delay_on) { 122c746b551SMark Brown case 1: 123c746b551SMark Brown led->blink_cyc = 0; 124c746b551SMark Brown break; 125c746b551SMark Brown case 3: 126c746b551SMark Brown led->blink_cyc = 1; 127c746b551SMark Brown break; 128c746b551SMark Brown case 4: 129c746b551SMark Brown led->blink_cyc = 2; 130c746b551SMark Brown break; 131c746b551SMark Brown case 8: 132c746b551SMark Brown led->blink_cyc = 3; 133c746b551SMark Brown break; 134c746b551SMark Brown default: 135c746b551SMark Brown ret = -EINVAL; 136c746b551SMark Brown break; 137c746b551SMark Brown } 138c746b551SMark Brown } 139c746b551SMark Brown 140c746b551SMark Brown if (ret == 0) 141c746b551SMark Brown led->blink = 1; 142c746b551SMark Brown else 143c746b551SMark Brown led->blink = 0; 144c746b551SMark Brown 145c746b551SMark Brown spin_unlock_irqrestore(&led->value_lock, flags); 146f633a512SAndrew Lunn wm831x_status_set(led); 147c746b551SMark Brown 148c746b551SMark Brown return ret; 149c746b551SMark Brown } 150c746b551SMark Brown 1518a4529a3SJingoo Han static const char * const led_src_texts[] = { 152c746b551SMark Brown "otp", 153c746b551SMark Brown "power", 154c746b551SMark Brown "charger", 155c746b551SMark Brown "soft", 156c746b551SMark Brown }; 157c746b551SMark Brown 158c746b551SMark Brown static ssize_t wm831x_status_src_show(struct device *dev, 159c746b551SMark Brown struct device_attribute *attr, char *buf) 160c746b551SMark Brown { 161c746b551SMark Brown struct led_classdev *led_cdev = dev_get_drvdata(dev); 162c746b551SMark Brown struct wm831x_status *led = to_wm831x_status(led_cdev); 163c746b551SMark Brown int i; 164c746b551SMark Brown ssize_t ret = 0; 165c746b551SMark Brown 166c746b551SMark Brown mutex_lock(&led->mutex); 167c746b551SMark Brown 168c746b551SMark Brown for (i = 0; i < ARRAY_SIZE(led_src_texts); i++) 169c746b551SMark Brown if (i == led->src) 170c746b551SMark Brown ret += sprintf(&buf[ret], "[%s] ", led_src_texts[i]); 171c746b551SMark Brown else 172c746b551SMark Brown ret += sprintf(&buf[ret], "%s ", led_src_texts[i]); 173c746b551SMark Brown 174c746b551SMark Brown mutex_unlock(&led->mutex); 175c746b551SMark Brown 176c746b551SMark Brown ret += sprintf(&buf[ret], "\n"); 177c746b551SMark Brown 178c746b551SMark Brown return ret; 179c746b551SMark Brown } 180c746b551SMark Brown 181c746b551SMark Brown static ssize_t wm831x_status_src_store(struct device *dev, 182c746b551SMark Brown struct device_attribute *attr, 183c746b551SMark Brown const char *buf, size_t size) 184c746b551SMark Brown { 185c746b551SMark Brown struct led_classdev *led_cdev = dev_get_drvdata(dev); 186c746b551SMark Brown struct wm831x_status *led = to_wm831x_status(led_cdev); 187c746b551SMark Brown int i; 188c746b551SMark Brown 189d54e5b52SAndy Shevchenko i = sysfs_match_string(led_src_texts, buf); 190d54e5b52SAndy Shevchenko if (i >= 0) { 191c746b551SMark Brown mutex_lock(&led->mutex); 192c746b551SMark Brown led->src = i; 193c746b551SMark Brown mutex_unlock(&led->mutex); 194f633a512SAndrew Lunn wm831x_status_set(led); 195c746b551SMark Brown } 196c746b551SMark Brown 197c746b551SMark Brown return size; 198c746b551SMark Brown } 199c746b551SMark Brown 200c746b551SMark Brown static DEVICE_ATTR(src, 0644, wm831x_status_src_show, wm831x_status_src_store); 201c746b551SMark Brown 202b2015ed5SJohan Hovold static struct attribute *wm831x_status_attrs[] = { 203b2015ed5SJohan Hovold &dev_attr_src.attr, 204b2015ed5SJohan Hovold NULL 205b2015ed5SJohan Hovold }; 206b2015ed5SJohan Hovold ATTRIBUTE_GROUPS(wm831x_status); 207b2015ed5SJohan Hovold 208c746b551SMark Brown static int wm831x_status_probe(struct platform_device *pdev) 209c746b551SMark Brown { 210c746b551SMark Brown struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 211c746b551SMark Brown struct wm831x_pdata *chip_pdata; 212c746b551SMark Brown struct wm831x_status_pdata pdata; 213c746b551SMark Brown struct wm831x_status *drvdata; 214c746b551SMark Brown struct resource *res; 215c746b551SMark Brown int id = pdev->id % ARRAY_SIZE(chip_pdata->status); 216c746b551SMark Brown int ret; 217c746b551SMark Brown 21861abeba5SMark Brown res = platform_get_resource(pdev, IORESOURCE_REG, 0); 219c746b551SMark Brown if (res == NULL) { 22061abeba5SMark Brown dev_err(&pdev->dev, "No register resource\n"); 221b2015ed5SJohan Hovold return -EINVAL; 222c746b551SMark Brown } 223c746b551SMark Brown 2241713cb9dSMark Brown drvdata = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_status), 2251713cb9dSMark Brown GFP_KERNEL); 226c746b551SMark Brown if (!drvdata) 227c746b551SMark Brown return -ENOMEM; 228c746b551SMark Brown 229c746b551SMark Brown drvdata->wm831x = wm831x; 230c746b551SMark Brown drvdata->reg = res->start; 231c746b551SMark Brown 23287aae1eaSJingoo Han if (dev_get_platdata(wm831x->dev)) 23387aae1eaSJingoo Han chip_pdata = dev_get_platdata(wm831x->dev); 234c746b551SMark Brown else 235c746b551SMark Brown chip_pdata = NULL; 236c746b551SMark Brown 237c746b551SMark Brown memset(&pdata, 0, sizeof(pdata)); 238c746b551SMark Brown if (chip_pdata && chip_pdata->status[id]) 239c746b551SMark Brown memcpy(&pdata, chip_pdata->status[id], sizeof(pdata)); 240c746b551SMark Brown else 241c746b551SMark Brown pdata.name = dev_name(&pdev->dev); 242c746b551SMark Brown 243c746b551SMark Brown mutex_init(&drvdata->mutex); 244c746b551SMark Brown spin_lock_init(&drvdata->value_lock); 245c746b551SMark Brown 246c746b551SMark Brown /* We cache the configuration register and read startup values 247c746b551SMark Brown * from it. */ 248c746b551SMark Brown drvdata->reg_val = wm831x_reg_read(wm831x, drvdata->reg); 249c746b551SMark Brown 250c746b551SMark Brown if (drvdata->reg_val & WM831X_LED_MODE_MASK) 251c746b551SMark Brown drvdata->brightness = LED_FULL; 252c746b551SMark Brown else 253c746b551SMark Brown drvdata->brightness = LED_OFF; 254c746b551SMark Brown 255c746b551SMark Brown /* Set a default source if configured, otherwise leave the 256c746b551SMark Brown * current hardware setting. 257c746b551SMark Brown */ 258c746b551SMark Brown if (pdata.default_src == WM831X_STATUS_PRESERVE) { 259c746b551SMark Brown drvdata->src = drvdata->reg_val; 260c746b551SMark Brown drvdata->src &= WM831X_LED_SRC_MASK; 261c746b551SMark Brown drvdata->src >>= WM831X_LED_SRC_SHIFT; 262c746b551SMark Brown } else { 263c746b551SMark Brown drvdata->src = pdata.default_src - 1; 264c746b551SMark Brown } 265c746b551SMark Brown 266c746b551SMark Brown drvdata->cdev.name = pdata.name; 267c746b551SMark Brown drvdata->cdev.default_trigger = pdata.default_trigger; 268f633a512SAndrew Lunn drvdata->cdev.brightness_set_blocking = wm831x_status_brightness_set; 269c746b551SMark Brown drvdata->cdev.blink_set = wm831x_status_blink_set; 270b2015ed5SJohan Hovold drvdata->cdev.groups = wm831x_status_groups; 271c746b551SMark Brown 2728d3b6a40SAmitoj Kaur Chawla ret = devm_led_classdev_register(wm831x->dev, &drvdata->cdev); 273c746b551SMark Brown if (ret < 0) { 274c746b551SMark Brown dev_err(&pdev->dev, "Failed to register LED: %d\n", ret); 275b2015ed5SJohan Hovold return ret; 276c746b551SMark Brown } 277c746b551SMark Brown 278c746b551SMark Brown return 0; 279c746b551SMark Brown } 280c746b551SMark Brown 281c746b551SMark Brown static struct platform_driver wm831x_status_driver = { 282c746b551SMark Brown .driver = { 283c746b551SMark Brown .name = "wm831x-status", 284c746b551SMark Brown }, 285c746b551SMark Brown .probe = wm831x_status_probe, 286c746b551SMark Brown }; 287c746b551SMark Brown 288892a8843SAxel Lin module_platform_driver(wm831x_status_driver); 289c746b551SMark Brown 290c746b551SMark Brown MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 291c746b551SMark Brown MODULE_DESCRIPTION("WM831x status LED driver"); 292c746b551SMark Brown MODULE_LICENSE("GPL"); 293c746b551SMark Brown MODULE_ALIAS("platform:wm831x-status"); 294