kernel/drivers/staging/fbtft/fbtft-sysfs.c

   1 #include "fbtft.h"
   2 #include "internal.h"
   3
   4 static int get_next_ulong(char **str_p, unsigned long *val, char *sep, int base)
   5 {
   6         char *p_val;
   7         int ret;
   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         ret = kstrtoul(p_val, base, val);
  18         if (ret)
  19                 return -EINVAL;
  20
  21         return 0;
  22 }
  23
  24 int fbtft_gamma_parse_str(struct fbtft_par *par, unsigned long *curves,
  25                                                 const char *str, int size)
  26 {
  27         char *str_p, *curve_p = NULL;
  28         char *tmp;
  29         unsigned long val = 0;
  30         int ret = 0;
  31         int curve_counter, value_counter;
  32
  33         fbtft_par_dbg(DEBUG_SYSFS, par, "%s() str=\n", __func__);
  34
  35         if (!str || !curves)
  36                 return -EINVAL;
  37
  38         fbtft_par_dbg(DEBUG_SYSFS, par, "%s\n", str);
  39
  40         tmp = kmemdup(str, size + 1, GFP_KERNEL);
  41         if (!tmp)
  42                 return -ENOMEM;
  43
  44         /* replace optional separators */
  45         str_p = tmp;
  46         while (*str_p) {
  47                 if (*str_p == ',')
  48                         *str_p = ' ';
  49                 if (*str_p == ';')
  50                         *str_p = '\n';
  51                 str_p++;
  52         }
  53
  54         str_p = strim(tmp);
  55
  56         curve_counter = 0;
  57         while (str_p) {
  58                 if (curve_counter == par->gamma.num_curves) {
  59                         dev_err(par->info->device, "Gamma: Too many curves\n");
  60                         ret = -EINVAL;
  61                         goto out;
  62                 }
  63                 curve_p = strsep(&str_p, "\n");
  64                 value_counter = 0;
  65                 while (curve_p) {
  66                         if (value_counter == par->gamma.num_values) {
  67                                 dev_err(par->info->device,
  68                                         "Gamma: Too many values\n");
  69                                 ret = -EINVAL;
  70                                 goto out;
  71                         }
  72                         ret = get_next_ulong(&curve_p, &val, " ", 16);
  73                         if (ret)
  74                                 goto out;
  75                         curves[curve_counter * par->gamma.num_values + value_counter] = val;
  76                         value_counter++;
  77                 }
  78                 if (value_counter != par->gamma.num_values) {
  79                         dev_err(par->info->device, "Gamma: Too few values\n");
  80                         ret = -EINVAL;
  81                         goto out;
  82                 }
  83                 curve_counter++;
  84         }
  85         if (curve_counter != par->gamma.num_curves) {
  86                 dev_err(par->info->device, "Gamma: Too few curves\n");
  87                 ret = -EINVAL;
  88                 goto out;
  89         }
  90
  91 out:
  92         kfree(tmp);
  93         return ret;
  94 }
  95
  96 static ssize_t
  97 sprintf_gamma(struct fbtft_par *par, unsigned long *curves, char *buf)
  98 {
  99         ssize_t len = 0;
 100         unsigned int i, j;
 101
 102         mutex_lock(&par->gamma.lock);
 103         for (i = 0; i < par->gamma.num_curves; i++) {
 104                 for (j = 0; j < par->gamma.num_values; j++)
 105                         len += scnprintf(&buf[len], PAGE_SIZE,
 106                                 "%04lx ", curves[i*par->gamma.num_values + j]);
 107                 buf[len-1] = '\n';
 108         }
 109         mutex_unlock(&par->gamma.lock);
 110
 111         return len;
 112 }
 113
 114 static ssize_t store_gamma_curve(struct device *device,
 115                                         struct device_attribute *attr,
 116                                         const char *buf, size_t count)
 117 {
 118         struct fb_info *fb_info = dev_get_drvdata(device);
 119         struct fbtft_par *par = fb_info->par;
 120         unsigned long tmp_curves[FBTFT_GAMMA_MAX_VALUES_TOTAL];
 121         int ret;
 122
 123         ret = fbtft_gamma_parse_str(par, tmp_curves, buf, count);
 124         if (ret)
 125                 return ret;
 126
 127         ret = par->fbtftops.set_gamma(par, tmp_curves);
 128         if (ret)
 129                 return ret;
 130
 131         mutex_lock(&par->gamma.lock);
 132         memcpy(par->gamma.curves, tmp_curves,
 133                 par->gamma.num_curves * par->gamma.num_values * sizeof(tmp_curves[0]));
 134         mutex_unlock(&par->gamma.lock);
 135
 136         return count;
 137 }
 138
 139 static ssize_t show_gamma_curve(struct device *device,
 140                                 struct device_attribute *attr, char *buf)
 141 {
 142         struct fb_info *fb_info = dev_get_drvdata(device);
 143         struct fbtft_par *par = fb_info->par;
 144
 145         return sprintf_gamma(par, par->gamma.curves, buf);
 146 }
 147
 148 static struct device_attribute gamma_device_attrs[] = {
 149         __ATTR(gamma, 0660, show_gamma_curve, store_gamma_curve),
 150 };
 151
 152
 153 void fbtft_expand_debug_value(unsigned long *debug)
 154 {
 155         switch (*debug & 0x7) {
 156         case 1:
 157                 *debug |= DEBUG_LEVEL_1;
 158                 break;
 159         case 2:
 160                 *debug |= DEBUG_LEVEL_2;
 161                 break;
 162         case 3:
 163                 *debug |= DEBUG_LEVEL_3;
 164                 break;
 165         case 4:
 166                 *debug |= DEBUG_LEVEL_4;
 167                 break;
 168         case 5:
 169                 *debug |= DEBUG_LEVEL_5;
 170                 break;
 171         case 6:
 172                 *debug |= DEBUG_LEVEL_6;
 173                 break;
 174         case 7:
 175                 *debug = 0xFFFFFFFF;
 176                 break;
 177         }
 178 }
 179
 180 static ssize_t store_debug(struct device *device,
 181                                 struct device_attribute *attr,
 182                                 const char *buf, size_t count)
 183 {
 184         struct fb_info *fb_info = dev_get_drvdata(device);
 185         struct fbtft_par *par = fb_info->par;
 186         int ret;
 187
 188         ret = kstrtoul(buf, 10, &par->debug);
 189         if (ret)
 190                 return ret;
 191         fbtft_expand_debug_value(&par->debug);
 192
 193         return count;
 194 }
 195
 196 static ssize_t show_debug(struct device *device,
 197                                 struct device_attribute *attr, char *buf)
 198 {
 199         struct fb_info *fb_info = dev_get_drvdata(device);
 200         struct fbtft_par *par = fb_info->par;
 201
 202         return snprintf(buf, PAGE_SIZE, "%lu\n", par->debug);
 203 }
 204
 205 static struct device_attribute debug_device_attr = \
 206         __ATTR(debug, 0660, show_debug, store_debug);
 207
 208
 209 void fbtft_sysfs_init(struct fbtft_par *par)
 210 {
 211         device_create_file(par->info->dev, &debug_device_attr);
 212         if (par->gamma.curves && par->fbtftops.set_gamma)
 213                 device_create_file(par->info->dev, &gamma_device_attrs[0]);
 214 }
 215
 216 void fbtft_sysfs_exit(struct fbtft_par *par)
 217 {
 218         device_remove_file(par->info->dev, &debug_device_attr);
 219         if (par->gamma.curves && par->fbtftops.set_gamma)
 220                 device_remove_file(par->info->dev, &gamma_device_attrs[0]);
 221 }