1 // SPDX-License-Identifier: (GPL-2.0 OR MIT) 2 // 3 // Copyright (c) 2018 BayLibre, SAS. 4 // Author: Jerome Brunet <jbrunet@baylibre.com> 5 6 #include <linux/gpio/consumer.h> 7 #include <linux/of_platform.h> 8 #include <linux/module.h> 9 #include <sound/soc.h> 10 11 struct es7241_clock_mode { 12 unsigned int rate_min; 13 unsigned int rate_max; 14 unsigned int *slv_mfs; 15 unsigned int slv_mfs_num; 16 unsigned int mst_mfs; 17 unsigned int mst_m0:1; 18 unsigned int mst_m1:1; 19 }; 20 21 struct es7241_chip { 22 const struct es7241_clock_mode *modes; 23 unsigned int mode_num; 24 }; 25 26 struct es7241_data { 27 struct gpio_desc *reset; 28 struct gpio_desc *m0; 29 struct gpio_desc *m1; 30 unsigned int fmt; 31 unsigned int mclk; 32 bool is_slave; 33 const struct es7241_chip *chip; 34 }; 35 36 static void es7241_set_mode(struct es7241_data *priv, int m0, int m1) 37 { 38 /* put the device in reset */ 39 gpiod_set_value_cansleep(priv->reset, 0); 40 41 /* set the mode */ 42 gpiod_set_value_cansleep(priv->m0, m0); 43 gpiod_set_value_cansleep(priv->m1, m1); 44 45 /* take the device out of reset - datasheet does not specify a delay */ 46 gpiod_set_value_cansleep(priv->reset, 1); 47 } 48 49 static int es7241_set_slave_mode(struct es7241_data *priv, 50 const struct es7241_clock_mode *mode, 51 unsigned int mfs) 52 { 53 int j; 54 55 if (!mfs) 56 goto out_ok; 57 58 for (j = 0; j < mode->slv_mfs_num; j++) { 59 if (mode->slv_mfs[j] == mfs) 60 goto out_ok; 61 } 62 63 return -EINVAL; 64 65 out_ok: 66 es7241_set_mode(priv, 1, 1); 67 return 0; 68 } 69 70 static int es7241_set_master_mode(struct es7241_data *priv, 71 const struct es7241_clock_mode *mode, 72 unsigned int mfs) 73 { 74 /* 75 * We can't really set clock ratio, if the mclk/lrclk is different 76 * from what we provide, then error out 77 */ 78 if (mfs && mfs != mode->mst_mfs) 79 return -EINVAL; 80 81 es7241_set_mode(priv, mode->mst_m0, mode->mst_m1); 82 83 return 0; 84 } 85 86 static int es7241_hw_params(struct snd_pcm_substream *substream, 87 struct snd_pcm_hw_params *params, 88 struct snd_soc_dai *dai) 89 { 90 struct es7241_data *priv = snd_soc_dai_get_drvdata(dai); 91 unsigned int rate = params_rate(params); 92 unsigned int mfs = priv->mclk / rate; 93 int i; 94 95 for (i = 0; i < priv->chip->mode_num; i++) { 96 const struct es7241_clock_mode *mode = &priv->chip->modes[i]; 97 98 if (rate < mode->rate_min || rate >= mode->rate_max) 99 continue; 100 101 if (priv->is_slave) 102 return es7241_set_slave_mode(priv, mode, mfs); 103 else 104 return es7241_set_master_mode(priv, mode, mfs); 105 } 106 107 /* should not happen */ 108 dev_err(dai->dev, "unsupported rate: %u\n", rate); 109 return -EINVAL; 110 } 111 112 static int es7241_set_sysclk(struct snd_soc_dai *dai, int clk_id, 113 unsigned int freq, int dir) 114 { 115 struct es7241_data *priv = snd_soc_dai_get_drvdata(dai); 116 117 if (dir == SND_SOC_CLOCK_IN && clk_id == 0) { 118 priv->mclk = freq; 119 return 0; 120 } 121 122 return -ENOTSUPP; 123 } 124 125 static int es7241_set_fmt(struct snd_soc_dai *dai, unsigned int fmt) 126 { 127 struct es7241_data *priv = snd_soc_dai_get_drvdata(dai); 128 129 if ((fmt & SND_SOC_DAIFMT_INV_MASK) != SND_SOC_DAIFMT_NB_NF) { 130 dev_err(dai->dev, "Unsupported dai clock inversion\n"); 131 return -EINVAL; 132 } 133 134 if ((fmt & SND_SOC_DAIFMT_FORMAT_MASK) != priv->fmt) { 135 dev_err(dai->dev, "Invalid dai format\n"); 136 return -EINVAL; 137 } 138 139 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { 140 case SND_SOC_DAIFMT_CBS_CFS: 141 priv->is_slave = true; 142 break; 143 case SND_SOC_DAIFMT_CBM_CFM: 144 priv->is_slave = false; 145 break; 146 147 default: 148 dev_err(dai->dev, "Unsupported clock configuration\n"); 149 return -EINVAL; 150 } 151 152 return 0; 153 } 154 155 static const struct snd_soc_dai_ops es7241_dai_ops = { 156 .set_fmt = es7241_set_fmt, 157 .hw_params = es7241_hw_params, 158 .set_sysclk = es7241_set_sysclk, 159 }; 160 161 static struct snd_soc_dai_driver es7241_dai = { 162 .name = "es7241-hifi", 163 .capture = { 164 .stream_name = "Capture", 165 .channels_min = 2, 166 .channels_max = 2, 167 .rates = SNDRV_PCM_RATE_8000_192000, 168 .formats = (SNDRV_PCM_FMTBIT_S16_LE | 169 SNDRV_PCM_FMTBIT_S24_3LE | 170 SNDRV_PCM_FMTBIT_S24_LE), 171 }, 172 .ops = &es7241_dai_ops, 173 }; 174 175 static const struct es7241_clock_mode es7241_modes[] = { 176 { 177 /* Single speed mode */ 178 .rate_min = 8000, 179 .rate_max = 50000, 180 .slv_mfs = (unsigned int[]) { 256, 384, 512, 768, 1024 }, 181 .slv_mfs_num = 5, 182 .mst_mfs = 256, 183 .mst_m0 = 0, 184 .mst_m1 = 0, 185 }, { 186 /* Double speed mode */ 187 .rate_min = 50000, 188 .rate_max = 100000, 189 .slv_mfs = (unsigned int[]) { 128, 192 }, 190 .slv_mfs_num = 2, 191 .mst_mfs = 128, 192 .mst_m0 = 1, 193 .mst_m1 = 0, 194 }, { 195 /* Quad speed mode */ 196 .rate_min = 100000, 197 .rate_max = 200000, 198 .slv_mfs = (unsigned int[]) { 64 }, 199 .slv_mfs_num = 1, 200 .mst_mfs = 64, 201 .mst_m0 = 0, 202 .mst_m1 = 1, 203 }, 204 }; 205 206 static const struct es7241_chip es7241_chip = { 207 .modes = es7241_modes, 208 .mode_num = ARRAY_SIZE(es7241_modes), 209 }; 210 211 static const struct snd_soc_dapm_widget es7241_dapm_widgets[] = { 212 SND_SOC_DAPM_INPUT("AINL"), 213 SND_SOC_DAPM_INPUT("AINR"), 214 SND_SOC_DAPM_DAC("ADC", "Capture", SND_SOC_NOPM, 0, 0), 215 SND_SOC_DAPM_REGULATOR_SUPPLY("VDDP", 0, 0), 216 SND_SOC_DAPM_REGULATOR_SUPPLY("VDDD", 0, 0), 217 SND_SOC_DAPM_REGULATOR_SUPPLY("VDDA", 0, 0), 218 }; 219 220 static const struct snd_soc_dapm_route es7241_dapm_routes[] = { 221 { "ADC", NULL, "AINL", }, 222 { "ADC", NULL, "AINR", }, 223 { "ADC", NULL, "VDDA", }, 224 { "Capture", NULL, "VDDP", }, 225 { "Capture", NULL, "VDDD", }, 226 }; 227 228 static const struct snd_soc_component_driver es7241_component_driver = { 229 .dapm_widgets = es7241_dapm_widgets, 230 .num_dapm_widgets = ARRAY_SIZE(es7241_dapm_widgets), 231 .dapm_routes = es7241_dapm_routes, 232 .num_dapm_routes = ARRAY_SIZE(es7241_dapm_routes), 233 .idle_bias_on = 1, 234 .endianness = 1, 235 .non_legacy_dai_naming = 1, 236 }; 237 238 static void es7241_parse_fmt(struct device *dev, struct es7241_data *priv) 239 { 240 bool is_leftj; 241 242 /* 243 * The format is given by a pull resistor on the SDOUT pin: 244 * pull-up for i2s, pull-down for left justified. 245 */ 246 is_leftj = of_property_read_bool(dev->of_node, 247 "everest,sdout-pull-down"); 248 if (is_leftj) 249 priv->fmt = SND_SOC_DAIFMT_LEFT_J; 250 else 251 priv->fmt = SND_SOC_DAIFMT_I2S; 252 } 253 254 static int es7241_probe(struct platform_device *pdev) 255 { 256 struct device *dev = &pdev->dev; 257 struct es7241_data *priv; 258 int err; 259 260 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); 261 if (!priv) 262 return -ENOMEM; 263 platform_set_drvdata(pdev, priv); 264 265 priv->chip = of_device_get_match_data(dev); 266 if (!priv->chip) { 267 dev_err(dev, "failed to match device\n"); 268 return -ENODEV; 269 } 270 271 es7241_parse_fmt(dev, priv); 272 273 priv->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW); 274 if (IS_ERR(priv->reset)) { 275 err = PTR_ERR(priv->reset); 276 if (err != -EPROBE_DEFER) 277 dev_err(dev, "Failed to get 'reset' gpio: %d", err); 278 return err; 279 } 280 281 priv->m0 = devm_gpiod_get_optional(dev, "m0", GPIOD_OUT_LOW); 282 if (IS_ERR(priv->m0)) { 283 err = PTR_ERR(priv->m0); 284 if (err != -EPROBE_DEFER) 285 dev_err(dev, "Failed to get 'm0' gpio: %d", err); 286 return err; 287 } 288 289 priv->m1 = devm_gpiod_get_optional(dev, "m1", GPIOD_OUT_LOW); 290 if (IS_ERR(priv->m1)) { 291 err = PTR_ERR(priv->m1); 292 if (err != -EPROBE_DEFER) 293 dev_err(dev, "Failed to get 'm1' gpio: %d", err); 294 return err; 295 } 296 297 return devm_snd_soc_register_component(&pdev->dev, 298 &es7241_component_driver, 299 &es7241_dai, 1); 300 } 301 302 #ifdef CONFIG_OF 303 static const struct of_device_id es7241_ids[] = { 304 { .compatible = "everest,es7241", .data = &es7241_chip }, 305 { } 306 }; 307 MODULE_DEVICE_TABLE(of, es7241_ids); 308 #endif 309 310 static struct platform_driver es7241_driver = { 311 .driver = { 312 .name = "es7241", 313 .of_match_table = of_match_ptr(es7241_ids), 314 }, 315 .probe = es7241_probe, 316 }; 317 318 module_platform_driver(es7241_driver); 319 320 MODULE_DESCRIPTION("ASoC ES7241 audio codec driver"); 321 MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>"); 322 MODULE_LICENSE("GPL"); 323