drivers/staging/fbtft/fbtft-sysfs.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include "fbtft.h"
   3 #include "internal.h"
   4
   5 static int get_next_ulong(char **str_p, unsigned long *val, char *sep, int base)
   6 {
   7         char *p_val;
   8
   9         if (!str_p || !(*str_p))
  10                 return -EINVAL;
  11
  12         p_val = strsep(str_p, sep);
  13
  14         if (!p_val)
  15                 return -EINVAL;
  16
  17         return kstrtoul(p_val, base, val);
  18 }
  19
  20 int fbtft_gamma_parse_str(struct fbtft_par *par, u32 *curves,
  21                           const char *str, int size)
  22 {
  23         char *str_p, *curve_p = NULL;
  24         char *tmp;
  25         unsigned long val = 0;
  26         int ret = 0;
  27         int curve_counter, value_counter;
  28         int _count;
  29
  30         if (!str || !curves)
  31                 return -EINVAL;
  32
  33         tmp = kmemdup(str, size + 1, GFP_KERNEL);
  34         if (!tmp)
  35                 return -ENOMEM;
  36
  37         /* replace optional separators */
  38         str_p = tmp;
  39         while (*str_p) {
  40                 if (*str_p == ',')
  41                         *str_p = ' ';
  42                 if (*str_p == ';')
  43                         *str_p = '\n';
  44                 str_p++;
  45         }
  46
  47         str_p = strim(tmp);
  48
  49         curve_counter = 0;
  50         while (str_p) {
  51                 if (curve_counter == par->gamma.num_curves) {
  52                         dev_err(par->info->device, "Gamma: Too many curves\n");
  53                         ret = -EINVAL;
  54                         goto out;
  55                 }
  56                 curve_p = strsep(&str_p, "\n");
  57                 value_counter = 0;
  58                 while (curve_p) {
  59                         if (value_counter == par->gamma.num_values) {
  60                                 dev_err(par->info->device,
  61                                         "Gamma: Too many values\n");
  62                                 ret = -EINVAL;
  63                                 goto out;
  64                         }
  65                         ret = get_next_ulong(&curve_p, &val, " ", 16);
  66                         if (ret)
  67                                 goto out;
  68
  69                         _count = curve_counter * par->gamma.num_values +
  70                                  value_counter;
  71                         curves[_count] = val;
  72                         value_counter++;
  73                 }
  74                 if (value_counter != par->gamma.num_values) {
  75                         dev_err(par->info->device, "Gamma: Too few values\n");
  76                         ret = -EINVAL;
  77                         goto out;
  78                 }
  79                 curve_counter++;
  80         }
  81         if (curve_counter != par->gamma.num_curves) {
  82                 dev_err(par->info->device, "Gamma: Too few curves\n");
  83                 ret = -EINVAL;
  84                 goto out;
  85         }
  86
  87 out:
  88         kfree(tmp);
  89         return ret;
  90 }
  91
  92 static ssize_t
  93 sprintf_gamma(struct fbtft_par *par, u32 *curves, char *buf)
  94 {
  95         ssize_t len = 0;
  96         unsigned int i, j;
  97
  98         mutex_lock(&par->gamma.lock);
  99         for (i = 0; i < par->gamma.num_curves; i++) {
 100                 for (j = 0; j < par->gamma.num_values; j++)
 101                         len += scnprintf(&buf[len], PAGE_SIZE,
 102                              "%04x ", curves[i * par->gamma.num_values + j]);
 103                 buf[len - 1] = '\n';
 104         }
 105         mutex_unlock(&par->gamma.lock);
 106
 107         return len;
 108 }
 109
 110 static ssize_t store_gamma_curve(struct device *device,
 111                                  struct device_attribute *attr,
 112                                  const char *buf, size_t count)
 113 {
 114         struct fb_info *fb_info = dev_get_drvdata(device);
 115         struct fbtft_par *par = fb_info->par;
 116         u32 tmp_curves[FBTFT_GAMMA_MAX_VALUES_TOTAL];
 117         int ret;
 118
 119         ret = fbtft_gamma_parse_str(par, tmp_curves, buf, count);
 120         if (ret)
 121                 return ret;
 122
 123         ret = par->fbtftops.set_gamma(par, tmp_curves);
 124         if (ret)
 125                 return ret;
 126
 127         mutex_lock(&par->gamma.lock);
 128         memcpy(par->gamma.curves, tmp_curves,
 129                par->gamma.num_curves * par->gamma.num_values *
 130                sizeof(tmp_curves[0]));
 131         mutex_unlock(&par->gamma.lock);
 132
 133         return count;
 134 }
 135
 136 static ssize_t show_gamma_curve(struct device *device,
 137                                 struct device_attribute *attr, char *buf)
 138 {
 139         struct fb_info *fb_info = dev_get_drvdata(device);
 140         struct fbtft_par *par = fb_info->par;
 141
 142         return sprintf_gamma(par, par->gamma.curves, buf);
 143 }
 144
 145 static struct device_attribute gamma_device_attrs[] = {
 146         __ATTR(gamma, 0660, show_gamma_curve, store_gamma_curve),
 147 };
 148
 149 void fbtft_expand_debug_value(unsigned long *debug)
 150 {
 151         switch (*debug & 0x7) {
 152         case 1:
 153                 *debug |= DEBUG_LEVEL_1;
 154                 break;
 155         case 2:
 156                 *debug |= DEBUG_LEVEL_2;
 157                 break;
 158         case 3:
 159                 *debug |= DEBUG_LEVEL_3;
 160                 break;
 161         case 4:
 162                 *debug |= DEBUG_LEVEL_4;
 163                 break;
 164         case 5:
 165                 *debug |= DEBUG_LEVEL_5;
 166                 break;
 167         case 6:
 168                 *debug |= DEBUG_LEVEL_6;
 169                 break;
 170         case 7:
 171                 *debug = 0xFFFFFFFF;
 172                 break;
 173         }
 174 }
 175
 176 static ssize_t store_debug(struct device *device,
 177                            struct device_attribute *attr,
 178                            const char *buf, size_t count)
 179 {
 180         struct fb_info *fb_info = dev_get_drvdata(device);
 181         struct fbtft_par *par = fb_info->par;
 182         int ret;
 183
 184         ret = kstrtoul(buf, 10, &par->debug);
 185         if (ret)
 186                 return ret;
 187         fbtft_expand_debug_value(&par->debug);
 188
 189         return count;
 190 }
 191
 192 static ssize_t show_debug(struct device *device,
 193                           struct device_attribute *attr, char *buf)
 194 {
 195         struct fb_info *fb_info = dev_get_drvdata(device);
 196         struct fbtft_par *par = fb_info->par;
 197
 198         return sysfs_emit(buf, "%lu\n", par->debug);
 199 }
 200
 201 static struct device_attribute debug_device_attr =
 202         __ATTR(debug, 0660, show_debug, store_debug);
 203
 204 void fbtft_sysfs_init(struct fbtft_par *par)
 205 {
 206         device_create_file(par->info->dev, &debug_device_attr);
 207         if (par->gamma.curves && par->fbtftops.set_gamma)
 208                 device_create_file(par->info->dev, &gamma_device_attrs[0]);
 209 }
 210
 211 void fbtft_sysfs_exit(struct fbtft_par *par)
 212 {
 213         device_remove_file(par->info->dev, &debug_device_attr);
 214         if (par->gamma.curves && par->fbtftops.set_gamma)
 215                 device_remove_file(par->info->dev, &gamma_device_attrs[0]);
 216 }