Meng Wang | 43bbb87 | 2018-12-10 12:32:05 +0800 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
Xiaojun Sang | 53cd13a | 2018-06-29 15:14:37 +0800 | [diff] [blame] | 2 | /* Copyright (c) 2016-2019, The Linux Foundation. All rights reserved. |
Asish Bhattacharya | 8e2277f | 2017-07-20 18:31:55 +0530 | [diff] [blame] | 3 | */ |
| 4 | |
| 5 | #include <linux/kernel.h> |
| 6 | #include <linux/init.h> |
| 7 | #include <linux/err.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/gpio.h> |
| 13 | #include <linux/of_gpio.h> |
Meng Wang | 11a25cf | 2018-10-31 14:11:26 +0800 | [diff] [blame] | 14 | #include <asoc/msm-cdc-pinctrl.h> |
Asish Bhattacharya | 8e2277f | 2017-07-20 18:31:55 +0530 | [diff] [blame] | 15 | |
| 16 | struct msm_cdc_pinctrl_info { |
| 17 | struct pinctrl *pinctrl; |
| 18 | struct pinctrl_state *pinctrl_active; |
| 19 | struct pinctrl_state *pinctrl_sleep; |
| 20 | int gpio; |
| 21 | bool state; |
| 22 | }; |
| 23 | |
| 24 | static struct msm_cdc_pinctrl_info *msm_cdc_pinctrl_get_gpiodata( |
| 25 | struct device_node *np) |
| 26 | { |
| 27 | struct platform_device *pdev; |
| 28 | struct msm_cdc_pinctrl_info *gpio_data; |
| 29 | |
| 30 | if (!np) { |
| 31 | pr_err("%s: device node is null\n", __func__); |
| 32 | return NULL; |
| 33 | } |
| 34 | |
| 35 | pdev = of_find_device_by_node(np); |
| 36 | if (!pdev) { |
| 37 | pr_err("%s: platform device not found!\n", __func__); |
| 38 | return NULL; |
| 39 | } |
| 40 | |
| 41 | gpio_data = dev_get_drvdata(&pdev->dev); |
| 42 | if (!gpio_data) |
| 43 | dev_err(&pdev->dev, "%s: cannot find cdc gpio info\n", |
| 44 | __func__); |
| 45 | |
| 46 | return gpio_data; |
| 47 | } |
| 48 | |
| 49 | /* |
| 50 | * msm_cdc_get_gpio_state: select pinctrl sleep state |
| 51 | * @np: pointer to struct device_node |
| 52 | * |
| 53 | * Returns error code for failure and GPIO value on success |
| 54 | */ |
| 55 | int msm_cdc_get_gpio_state(struct device_node *np) |
| 56 | { |
| 57 | struct msm_cdc_pinctrl_info *gpio_data; |
| 58 | int value = -EINVAL; |
| 59 | |
| 60 | gpio_data = msm_cdc_pinctrl_get_gpiodata(np); |
| 61 | if (!gpio_data) |
| 62 | return value; |
| 63 | |
| 64 | if (gpio_is_valid(gpio_data->gpio)) |
| 65 | value = gpio_get_value_cansleep(gpio_data->gpio); |
| 66 | |
| 67 | return value; |
| 68 | } |
| 69 | EXPORT_SYMBOL(msm_cdc_get_gpio_state); |
| 70 | |
| 71 | /* |
| 72 | * msm_cdc_pinctrl_select_sleep_state: select pinctrl sleep state |
| 73 | * @np: pointer to struct device_node |
| 74 | * |
| 75 | * Returns error code for failure |
| 76 | */ |
| 77 | int msm_cdc_pinctrl_select_sleep_state(struct device_node *np) |
| 78 | { |
| 79 | struct msm_cdc_pinctrl_info *gpio_data; |
| 80 | |
| 81 | gpio_data = msm_cdc_pinctrl_get_gpiodata(np); |
| 82 | if (!gpio_data) |
| 83 | return -EINVAL; |
| 84 | |
| 85 | if (!gpio_data->pinctrl_sleep) { |
| 86 | pr_err("%s: pinctrl sleep state is null\n", __func__); |
| 87 | return -EINVAL; |
| 88 | } |
| 89 | gpio_data->state = false; |
| 90 | |
| 91 | return pinctrl_select_state(gpio_data->pinctrl, |
| 92 | gpio_data->pinctrl_sleep); |
| 93 | } |
| 94 | EXPORT_SYMBOL(msm_cdc_pinctrl_select_sleep_state); |
| 95 | |
| 96 | /* |
| 97 | * msm_cdc_pinctrl_select_active_state: select pinctrl active state |
| 98 | * @np: pointer to struct device_node |
| 99 | * |
| 100 | * Returns error code for failure |
| 101 | */ |
| 102 | int msm_cdc_pinctrl_select_active_state(struct device_node *np) |
| 103 | { |
| 104 | struct msm_cdc_pinctrl_info *gpio_data; |
| 105 | |
| 106 | gpio_data = msm_cdc_pinctrl_get_gpiodata(np); |
| 107 | if (!gpio_data) |
| 108 | return -EINVAL; |
| 109 | |
| 110 | if (!gpio_data->pinctrl_active) { |
| 111 | pr_err("%s: pinctrl active state is null\n", __func__); |
| 112 | return -EINVAL; |
| 113 | } |
| 114 | gpio_data->state = true; |
| 115 | |
| 116 | return pinctrl_select_state(gpio_data->pinctrl, |
| 117 | gpio_data->pinctrl_active); |
| 118 | } |
| 119 | EXPORT_SYMBOL(msm_cdc_pinctrl_select_active_state); |
| 120 | |
| 121 | /* |
| 122 | * msm_cdc_pinctrl_get_state: get curren pinctrl state |
| 123 | * @np: pointer to struct device_node |
| 124 | * |
Karthikeyan Mani | 326536d | 2019-06-03 13:29:43 -0700 | [diff] [blame^] | 125 | * Returns 0 for sleep state, 1 for active state, |
| 126 | * error code for failure |
Asish Bhattacharya | 8e2277f | 2017-07-20 18:31:55 +0530 | [diff] [blame] | 127 | */ |
Karthikeyan Mani | 326536d | 2019-06-03 13:29:43 -0700 | [diff] [blame^] | 128 | int msm_cdc_pinctrl_get_state(struct device_node *np) |
Asish Bhattacharya | 8e2277f | 2017-07-20 18:31:55 +0530 | [diff] [blame] | 129 | { |
| 130 | struct msm_cdc_pinctrl_info *gpio_data; |
| 131 | |
| 132 | gpio_data = msm_cdc_pinctrl_get_gpiodata(np); |
| 133 | if (!gpio_data) |
| 134 | return -EINVAL; |
| 135 | |
| 136 | return gpio_data->state; |
| 137 | } |
| 138 | EXPORT_SYMBOL(msm_cdc_pinctrl_get_state); |
| 139 | |
| 140 | static int msm_cdc_pinctrl_probe(struct platform_device *pdev) |
| 141 | { |
| 142 | int ret = 0; |
| 143 | struct msm_cdc_pinctrl_info *gpio_data; |
| 144 | |
| 145 | gpio_data = devm_kzalloc(&pdev->dev, |
| 146 | sizeof(struct msm_cdc_pinctrl_info), |
| 147 | GFP_KERNEL); |
| 148 | if (!gpio_data) |
| 149 | return -ENOMEM; |
| 150 | |
| 151 | gpio_data->pinctrl = devm_pinctrl_get(&pdev->dev); |
| 152 | if (IS_ERR_OR_NULL(gpio_data->pinctrl)) { |
| 153 | dev_err(&pdev->dev, "%s: Cannot get cdc gpio pinctrl:%ld\n", |
| 154 | __func__, PTR_ERR(gpio_data->pinctrl)); |
| 155 | ret = PTR_ERR(gpio_data->pinctrl); |
| 156 | goto err_pctrl_get; |
| 157 | } |
| 158 | |
| 159 | gpio_data->pinctrl_active = pinctrl_lookup_state( |
| 160 | gpio_data->pinctrl, "aud_active"); |
| 161 | if (IS_ERR_OR_NULL(gpio_data->pinctrl_active)) { |
| 162 | dev_err(&pdev->dev, "%s: Cannot get aud_active pinctrl state:%ld\n", |
| 163 | __func__, PTR_ERR(gpio_data->pinctrl_active)); |
| 164 | ret = PTR_ERR(gpio_data->pinctrl_active); |
| 165 | goto err_lookup_state; |
| 166 | } |
| 167 | |
| 168 | gpio_data->pinctrl_sleep = pinctrl_lookup_state( |
| 169 | gpio_data->pinctrl, "aud_sleep"); |
| 170 | if (IS_ERR_OR_NULL(gpio_data->pinctrl_sleep)) { |
| 171 | dev_err(&pdev->dev, "%s: Cannot get aud_sleep pinctrl state:%ld\n", |
| 172 | __func__, PTR_ERR(gpio_data->pinctrl_sleep)); |
| 173 | ret = PTR_ERR(gpio_data->pinctrl_sleep); |
| 174 | goto err_lookup_state; |
| 175 | } |
| 176 | /* skip setting to sleep state for LPI_TLMM GPIOs */ |
| 177 | if (!of_property_read_bool(pdev->dev.of_node, "qcom,lpi-gpios")) { |
| 178 | /* Set pinctrl state to aud_sleep by default */ |
| 179 | ret = pinctrl_select_state(gpio_data->pinctrl, |
| 180 | gpio_data->pinctrl_sleep); |
| 181 | if (ret) |
| 182 | dev_err(&pdev->dev, "%s: set cdc gpio sleep state fail: %d\n", |
| 183 | __func__, ret); |
| 184 | } |
| 185 | |
| 186 | gpio_data->gpio = of_get_named_gpio(pdev->dev.of_node, |
| 187 | "qcom,cdc-rst-n-gpio", 0); |
| 188 | if (gpio_is_valid(gpio_data->gpio)) { |
| 189 | ret = gpio_request(gpio_data->gpio, "MSM_CDC_RESET"); |
| 190 | if (ret) { |
| 191 | dev_err(&pdev->dev, "%s: Failed to request gpio %d\n", |
| 192 | __func__, gpio_data->gpio); |
| 193 | goto err_lookup_state; |
| 194 | } |
| 195 | } |
| 196 | |
| 197 | dev_set_drvdata(&pdev->dev, gpio_data); |
| 198 | return 0; |
| 199 | |
| 200 | err_lookup_state: |
| 201 | devm_pinctrl_put(gpio_data->pinctrl); |
| 202 | err_pctrl_get: |
| 203 | devm_kfree(&pdev->dev, gpio_data); |
| 204 | return ret; |
| 205 | } |
| 206 | |
| 207 | static int msm_cdc_pinctrl_remove(struct platform_device *pdev) |
| 208 | { |
| 209 | struct msm_cdc_pinctrl_info *gpio_data; |
| 210 | |
| 211 | gpio_data = dev_get_drvdata(&pdev->dev); |
| 212 | |
Laxminath Kasam | 8f7ccc2 | 2017-08-28 17:35:04 +0530 | [diff] [blame] | 213 | /* to free the requested gpio before exiting */ |
| 214 | if (gpio_data) { |
| 215 | if (gpio_is_valid(gpio_data->gpio)) |
| 216 | gpio_free(gpio_data->gpio); |
| 217 | |
| 218 | if (gpio_data->pinctrl) |
| 219 | devm_pinctrl_put(gpio_data->pinctrl); |
| 220 | } |
Asish Bhattacharya | 8e2277f | 2017-07-20 18:31:55 +0530 | [diff] [blame] | 221 | |
| 222 | devm_kfree(&pdev->dev, gpio_data); |
| 223 | |
| 224 | return 0; |
| 225 | } |
| 226 | |
| 227 | static const struct of_device_id msm_cdc_pinctrl_match[] = { |
| 228 | {.compatible = "qcom,msm-cdc-pinctrl"}, |
| 229 | {} |
| 230 | }; |
| 231 | |
| 232 | static struct platform_driver msm_cdc_pinctrl_driver = { |
| 233 | .driver = { |
| 234 | .name = "msm-cdc-pinctrl", |
| 235 | .owner = THIS_MODULE, |
| 236 | .of_match_table = msm_cdc_pinctrl_match, |
Xiaojun Sang | 53cd13a | 2018-06-29 15:14:37 +0800 | [diff] [blame] | 237 | .suppress_bind_attrs = true, |
Asish Bhattacharya | 8e2277f | 2017-07-20 18:31:55 +0530 | [diff] [blame] | 238 | }, |
| 239 | .probe = msm_cdc_pinctrl_probe, |
| 240 | .remove = msm_cdc_pinctrl_remove, |
| 241 | }; |
| 242 | |
| 243 | int msm_cdc_pinctrl_drv_init(void) |
| 244 | { |
| 245 | return platform_driver_register(&msm_cdc_pinctrl_driver); |
| 246 | } |
| 247 | |
| 248 | void msm_cdc_pinctrl_drv_exit(void) |
| 249 | { |
| 250 | platform_driver_unregister(&msm_cdc_pinctrl_driver); |
| 251 | } |
| 252 | MODULE_DESCRIPTION("MSM CODEC pin control platform driver"); |
| 253 | MODULE_LICENSE("GPL v2"); |